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Matović, Jovan

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  • Matović, Jovan (10)
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Author's Bibliography

Plasmonic Nanomembranes for Detection and Sensing

Jakšić, Zoran; Matović, Jovan; Obradov, Marko; Tanasković, Dragan; Radovanović, Filip; Jakšić, Olga

(Belgrade : s. n., 2015)

TY  - CONF
AU  - Jakšić, Zoran
AU  - Matović, Jovan
AU  - Obradov, Marko
AU  - Tanasković, Dragan
AU  - Radovanović, Filip
AU  - Jakšić, Olga
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/803
AB  - Nanomembranes, freestanding quasi-2D structures with thickness of the order of tens of nm and smaller and a giant aspect ratio with lateral dimensions of the order of millimeters, even centimeters, represent an important building blocks in micro and nanosystems [1], corresponding to ubiquitous bilipid membranes in living cells [2]. In this contribution we present our results in theory, design and experimental fabrication of metallic and metal-dielectric nanomembranes with plasmonic properties, intended for the use in the field of sensing. We first consider different approaches to functionalization and nanostructuring of nanomembranes [3]. These include introduction of noble metal or transparent conductive oxides fillers directly into the nanomembrane, lamination (multilayering) and patterning by 2D arrays of subwavelength nanoholes. Within this context we describe our results on nanofabrication of 8 nm thick chromium-based composite nanomembranes. Biomimetic structures utilizing nanochannel-based pores are also considered. We further present our results related to the design of chemical and biological sensors based on nanomembranes with plasmonic metamaterial properties [4]. Such sensors function as refractometric devices utilizing evanescent near fields as optical concentrators and adsorption-desorption mechanism, which ensures their ultra-high sensitivity that reaches single molecule detection [5]. We present some results on chemical sensors utilizing nanomembranes exhibiting extraordinary optical transmission, as well as those based on doublefishnet structures. Finally we consider the enhancement of infrared detectors by nanomembranes [6] utilizing the designer plasmon mechanism [7].

REFERENCES
1. Jiang, C., Markutsya, S., Pikus, Y., and Tsukruk, V. V., Nature Mater., 3, 721-728 (2004).
2. Matović, J., and Jakšić, Z., "Bionic (Nano)Membranes" in Biomimetics – Materials, Structures and Processes. Examples, Ideas and Case Studies, edited by Gruber, P.; Bruckner, D.; Hellmich, C.; Schmiedmayer, H.-B.; Stachelberger, H.; Gebeshuber, I. C., Berlin: Springer, 2011, pp 9-24.
3. Jakšić, Z., and Matovic, J., Materials, 3, 165-200, (2010).
4. Jakšić, Z., Vuković, S. M., Buha, J., and Matovic, J., J. Nanophotonics, 5, 051818 (2011)
5. Jakšić, Z., Micro and Nanophotonics for Semiconductor Infrared Detectors: Towards an Ultimate Uncooled Device, Cham: Springer, 2014.
6. Zijlstra, P., Paulo, P. M. R., and Orrit, M., Nature Nanotech., 7, 379-382 (2012).
7. Pendry, J. B., Martín-Moreno, L., and Garcia-Vidal, F. J., Science, 305 847-848 (2004).
PB  - Belgrade : s. n.
C3  - XIX Symposium on Condensed Matter Physics SFKM 2015, 7–11 September 2015, Belgrade, Serbia: Book of Abstracts
T1  - Plasmonic Nanomembranes for Detection and Sensing
SP  - 68
EP  - 68
ER  - 
@conference{
author = "Jakšić, Zoran and Matović, Jovan and Obradov, Marko and Tanasković, Dragan and Radovanović, Filip and Jakšić, Olga",
year = "2015",
url = "http://dais.sanu.ac.rs/123456789/803",
abstract = "Nanomembranes, freestanding quasi-2D structures with thickness of the order of tens of nm and smaller and a giant aspect ratio with lateral dimensions of the order of millimeters, even centimeters, represent an important building blocks in micro and nanosystems [1], corresponding to ubiquitous bilipid membranes in living cells [2]. In this contribution we present our results in theory, design and experimental fabrication of metallic and metal-dielectric nanomembranes with plasmonic properties, intended for the use in the field of sensing. We first consider different approaches to functionalization and nanostructuring of nanomembranes [3]. These include introduction of noble metal or transparent conductive oxides fillers directly into the nanomembrane, lamination (multilayering) and patterning by 2D arrays of subwavelength nanoholes. Within this context we describe our results on nanofabrication of 8 nm thick chromium-based composite nanomembranes. Biomimetic structures utilizing nanochannel-based pores are also considered. We further present our results related to the design of chemical and biological sensors based on nanomembranes with plasmonic metamaterial properties [4]. Such sensors function as refractometric devices utilizing evanescent near fields as optical concentrators and adsorption-desorption mechanism, which ensures their ultra-high sensitivity that reaches single molecule detection [5]. We present some results on chemical sensors utilizing nanomembranes exhibiting extraordinary optical transmission, as well as those based on doublefishnet structures. Finally we consider the enhancement of infrared detectors by nanomembranes [6] utilizing the designer plasmon mechanism [7].

REFERENCES
1. Jiang, C., Markutsya, S., Pikus, Y., and Tsukruk, V. V., Nature Mater., 3, 721-728 (2004).
2. Matović, J., and Jakšić, Z., "Bionic (Nano)Membranes" in Biomimetics – Materials, Structures and Processes. Examples, Ideas and Case Studies, edited by Gruber, P.; Bruckner, D.; Hellmich, C.; Schmiedmayer, H.-B.; Stachelberger, H.; Gebeshuber, I. C., Berlin: Springer, 2011, pp 9-24.
3. Jakšić, Z., and Matovic, J., Materials, 3, 165-200, (2010).
4. Jakšić, Z., Vuković, S. M., Buha, J., and Matovic, J., J. Nanophotonics, 5, 051818 (2011)
5. Jakšić, Z., Micro and Nanophotonics for Semiconductor Infrared Detectors: Towards an Ultimate Uncooled Device, Cham: Springer, 2014.
6. Zijlstra, P., Paulo, P. M. R., and Orrit, M., Nature Nanotech., 7, 379-382 (2012).
7. Pendry, J. B., Martín-Moreno, L., and Garcia-Vidal, F. J., Science, 305 847-848 (2004).",
publisher = "Belgrade : s. n.",
journal = "XIX Symposium on Condensed Matter Physics SFKM 2015, 7–11 September 2015, Belgrade, Serbia: Book of Abstracts",
title = "Plasmonic Nanomembranes for Detection and Sensing",
pages = "68-68"
}
Jakšić, Z., Matović, J., Obradov, M., Tanasković, D., Radovanović, F.,& Jakšić, O. (2015). Plasmonic Nanomembranes for Detection and Sensing.
XIX Symposium on Condensed Matter Physics SFKM 2015, 7–11 September 2015, Belgrade, Serbia: Book of AbstractsBelgrade : s. n.., 68-68.
Jakšić Z, Matović J, Obradov M, Tanasković D, Radovanović F, Jakšić O. Plasmonic Nanomembranes for Detection and Sensing. XIX Symposium on Condensed Matter Physics SFKM 2015, 7–11 September 2015, Belgrade, Serbia: Book of Abstracts. 2015;:68-68
Jakšić Zoran, Matović Jovan, Obradov Marko, Tanasković Dragan, Radovanović Filip, Jakšić Olga, "Plasmonic Nanomembranes for Detection and Sensing" (2015):68-68

Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells

Ligon, Samuel; Kellner, Michael; Radovanović, Filip; Matović, Jovan; Liska, Robert

(Basel : RadTech Europe, 2013)

TY  - CONF
AU  - Ligon, Samuel
AU  - Kellner, Michael
AU  - Radovanović, Filip
AU  - Matović, Jovan
AU  - Liska, Robert
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/813
AB  - Proton exchange membranes (PEM) for low temperature fuel cells must ensure high proton conductivity and effective separation of anode and cathode under operating conditions. DuPont’s sulfonic acid fluoropolymer Nafion has seen commercial success, though high cost limits wider acceptance. As lower cost options, polymers based on 2-acrylamido-2-methylpropane sulfonic acid (AMPS) are also investigated. Swelling of polyAMPS (PAMPS) is however a shortcoming, although this may be reduced by improved crosslinking. Both commercial and novel crosslinkers were tested with AMPS by dissolving with photoinitiator in water and photo-curing. To facilitate conductivity measurements, polymers were constrained within a porous membrane. In contrast to commercial crosslinkers, where high percentages are required to improve conductivity, our new acrylamide based crosslinkers showed excellent results at lower concentrations. Thus 5 wt% crosslinker provided membranes with 2.5 times the conductivity of Nafion. The novel polymers were then coated onto asymmetric membranes increasing proton-conductivity and reducing methanol crossover.
PB  - Basel : RadTech Europe
C3  - RadTech Europe 13: UV/EB – Growing through Innovation, October 15-17, 2013 in Basel, Switzerland: abstract book
T1  - Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells
SP  - 88
EP  - 88
ER  - 
@conference{
author = "Ligon, Samuel and Kellner, Michael and Radovanović, Filip and Matović, Jovan and Liska, Robert",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/813",
abstract = "Proton exchange membranes (PEM) for low temperature fuel cells must ensure high proton conductivity and effective separation of anode and cathode under operating conditions. DuPont’s sulfonic acid fluoropolymer Nafion has seen commercial success, though high cost limits wider acceptance. As lower cost options, polymers based on 2-acrylamido-2-methylpropane sulfonic acid (AMPS) are also investigated. Swelling of polyAMPS (PAMPS) is however a shortcoming, although this may be reduced by improved crosslinking. Both commercial and novel crosslinkers were tested with AMPS by dissolving with photoinitiator in water and photo-curing. To facilitate conductivity measurements, polymers were constrained within a porous membrane. In contrast to commercial crosslinkers, where high percentages are required to improve conductivity, our new acrylamide based crosslinkers showed excellent results at lower concentrations. Thus 5 wt% crosslinker provided membranes with 2.5 times the conductivity of Nafion. The novel polymers were then coated onto asymmetric membranes increasing proton-conductivity and reducing methanol crossover.",
publisher = "Basel : RadTech Europe",
journal = "RadTech Europe 13: UV/EB – Growing through Innovation, October 15-17, 2013 in Basel, Switzerland: abstract book",
title = "Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells",
pages = "88-88"
}
Ligon, S., Kellner, M., Radovanović, F., Matović, J.,& Liska, R. (2013). Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells.
RadTech Europe 13: UV/EB – Growing through Innovation, October 15-17, 2013 in Basel, Switzerland: abstract bookBasel : RadTech Europe., 88-88.
Ligon S, Kellner M, Radovanović F, Matović J, Liska R. Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells. RadTech Europe 13: UV/EB – Growing through Innovation, October 15-17, 2013 in Basel, Switzerland: abstract book. 2013;:88-88
Ligon Samuel, Kellner Michael, Radovanović Filip, Matović Jovan, Liska Robert, "Photocurable Poly-AMPS-Based Proton Exchange Membranes For Fuel Cells" (2013):88-88

Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials

Jakšić, Zoran; Radovanović, Filip; Nastasović, Aleksandra; Matović, Jovan

(Cambrridge, MA : The Electromagnetics Academy, 2013)

TY  - CONF
AU  - Jakšić, Zoran
AU  - Radovanović, Filip
AU  - Nastasović, Aleksandra
AU  - Matović, Jovan
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/783
AB  - We considered the possibility to fabricate multifunctional nanocomposite membranes as a platform for plasmonic metamaterials, simultaneously incorporating pores, built-in functional groups and active nanoparticles. To this purpose we combined lamination and inclusion of nanofillers into the membrane host. For the basic material we chose macroporous crosslinked copolymers based on glycidyl methacrylate (GMA). The epoxy group present in GMA molecule is readily transformed into various functional groups that further serve as affinity enhancers, ensuring the usability of the membranes as pre-concentrators of selected agents in plasmonic sensors. To form GMA-based membranes we used a recently proposed method combining the traditional immersion precipitation with photopolymerization and crosslinking of functional monomers. Further functionalization is obtained by in-situ formation of noble metal nanoparticles directly within the GMA host. In this way membranes with simultaneous plasmonic, adsorbent and catalytic functionality are obtained. We considered the use of the our structures for plasmonic chemical sensors where separator, pre-concentrator and binding agent are integrated with the plasmonic crystal, as well as for plasmonic enhancement of photocatalytic reactions in microreactors. Our approach gives a highly tailorable element compatible with microelectromechanical systems (MEMS) technologies and readily transferable across platforms.
PB  - Cambrridge, MA : The Electromagnetics Academy
C3  - Progress in Electromagnetics Research Symposium, PIERS 2013, 12-15 August 2013, Stockholm, Sweden
T1  - Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials
SP  - 1016
EP  - 1020
ER  - 
@conference{
author = "Jakšić, Zoran and Radovanović, Filip and Nastasović, Aleksandra and Matović, Jovan",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/783",
abstract = "We considered the possibility to fabricate multifunctional nanocomposite membranes as a platform for plasmonic metamaterials, simultaneously incorporating pores, built-in functional groups and active nanoparticles. To this purpose we combined lamination and inclusion of nanofillers into the membrane host. For the basic material we chose macroporous crosslinked copolymers based on glycidyl methacrylate (GMA). The epoxy group present in GMA molecule is readily transformed into various functional groups that further serve as affinity enhancers, ensuring the usability of the membranes as pre-concentrators of selected agents in plasmonic sensors. To form GMA-based membranes we used a recently proposed method combining the traditional immersion precipitation with photopolymerization and crosslinking of functional monomers. Further functionalization is obtained by in-situ formation of noble metal nanoparticles directly within the GMA host. In this way membranes with simultaneous plasmonic, adsorbent and catalytic functionality are obtained. We considered the use of the our structures for plasmonic chemical sensors where separator, pre-concentrator and binding agent are integrated with the plasmonic crystal, as well as for plasmonic enhancement of photocatalytic reactions in microreactors. Our approach gives a highly tailorable element compatible with microelectromechanical systems (MEMS) technologies and readily transferable across platforms.",
publisher = "Cambrridge, MA : The Electromagnetics Academy",
journal = "Progress in Electromagnetics Research Symposium, PIERS 2013, 12-15 August 2013, Stockholm, Sweden",
title = "Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials",
pages = "1016-1020"
}
Jakšić, Z., Radovanović, F., Nastasović, A.,& Matović, J. (2013). Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials.
Progress in Electromagnetics Research Symposium, PIERS 2013, 12-15 August 2013, Stockholm, SwedenCambrridge, MA : The Electromagnetics Academy., 1016-1020.
Jakšić Z, Radovanović F, Nastasović A, Matović J. Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials. Progress in Electromagnetics Research Symposium, PIERS 2013, 12-15 August 2013, Stockholm, Sweden. 2013;:1016-1020
Jakšić Zoran, Radovanović Filip, Nastasović Aleksandra, Matović Jovan, "Multifunctionalized Self-supported (Nano) Membranes as Integrated Platform for Plasmonic Metamaterials" (2013):1016-1020

Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells

Kellner, Michael; Radovanović, Filip; Matović, Jovan; Liska, Robert

(Taylor & Francis Group, 2013)

TY  - JOUR
AU  - Kellner, Michael
AU  - Radovanović, Filip
AU  - Matović, Jovan
AU  - Liska, Robert
PY  - 2013
UR  - http://dais.sanu.ac.rs/123456789/771
AB  - Polymer electrolyte fuel cells (PEFCs) are an ideal solution leading to clean energy by directly converting the fuel’s chemical energy to electricity in order to achieve high degree of efficiency. One of the main components of PEFCs is the proton exchange membrane which should conduct protons but no electrons and should also separate the electrodes and limit fuel crossover. In addition to Nafion®, polymers of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) have been used as a proton-conducting ionomer since sulfonic groups are known for their good proton conductivity. Since poly-AMPS excessively swells or even dissolve in water, we investigated several commercial cross-linkers and new multifunctional monomers to decrease swelling by cross-linking. Formulations with different concentrations of these cross-linkers have been tested constrained in porous polypropylene membranes. Although formulations with commercial cross-linkers (polyethylene glycol diacrylates) already exceeded the conductivity of Nafion®, with some of the synthesized cross-linkers we achieved more than 2.5 times the conductivity of Nafion®. Moreover, the novel amide-based cross-linkers show good hydrolytical stability in contrast to the commercial ones. Finally, we used one of the new cross-linkers to prepare asymmetric membranes and could achieve about 8 times the conductivity of Nafion.
PB  - Taylor & Francis Group
T2  - Designed Monomers and Polymers
T1  - Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells
SP  - 372
EP  - 379
VL  - 17
IS  - 4
DO  - 10.1080/15685551.2013.840513
ER  - 
@article{
author = "Kellner, Michael and Radovanović, Filip and Matović, Jovan and Liska, Robert",
year = "2013",
url = "http://dais.sanu.ac.rs/123456789/771",
abstract = "Polymer electrolyte fuel cells (PEFCs) are an ideal solution leading to clean energy by directly converting the fuel’s chemical energy to electricity in order to achieve high degree of efficiency. One of the main components of PEFCs is the proton exchange membrane which should conduct protons but no electrons and should also separate the electrodes and limit fuel crossover. In addition to Nafion®, polymers of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) have been used as a proton-conducting ionomer since sulfonic groups are known for their good proton conductivity. Since poly-AMPS excessively swells or even dissolve in water, we investigated several commercial cross-linkers and new multifunctional monomers to decrease swelling by cross-linking. Formulations with different concentrations of these cross-linkers have been tested constrained in porous polypropylene membranes. Although formulations with commercial cross-linkers (polyethylene glycol diacrylates) already exceeded the conductivity of Nafion®, with some of the synthesized cross-linkers we achieved more than 2.5 times the conductivity of Nafion®. Moreover, the novel amide-based cross-linkers show good hydrolytical stability in contrast to the commercial ones. Finally, we used one of the new cross-linkers to prepare asymmetric membranes and could achieve about 8 times the conductivity of Nafion.",
publisher = "Taylor & Francis Group",
journal = "Designed Monomers and Polymers",
title = "Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells",
pages = "372-379",
volume = "17",
number = "4",
doi = "10.1080/15685551.2013.840513"
}
Kellner, M., Radovanović, F., Matović, J.,& Liska, R. (2013). Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells.
Designed Monomers and PolymersTaylor & Francis Group., 17(4), 372-379.
https://doi.org/10.1080/15685551.2013.840513
Kellner M, Radovanović F, Matović J, Liska R. Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells. Designed Monomers and Polymers. 2013;17(4):372-379
Kellner Michael, Radovanović Filip, Matović Jovan, Liska Robert, "Novel cross-linkers for asymmetric poly-AMPS-based proton exchange membranes for fuel cells" 17, no. 4 (2013):372-379,
https://doi.org/10.1080/15685551.2013.840513 .
8
6
8

Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization

Radovanović, Filip; Kellner, Michael; Matović, Jovan; Liska, Robert; Koch, T.

(Elsevier, 2012)

TY  - JOUR
AU  - Radovanović, Filip
AU  - Kellner, Michael
AU  - Matović, Jovan
AU  - Liska, Robert
AU  - Koch, T.
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/770
AB  - A new method for the preparation of asymmetric membranes with an interpenetrating proton-conducting morphology, which consists of cross-linked sulfonic acid functionalized ionomers embedded within a matrix of a thermally-resistant, glassy polymer is presented. This method combines a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. The resulting membranes have an integral top skin layer with fine proton-conducting channels on top of a coarser proton-conducting support. In-plane conductivities of some of these membranes measured at ambient temperature were significantly higher than the conductivity of Nafion membranes, while having improved methanol barrier properties. An increase in functionality and molecular weight of crosslinking agents, as well as a selection of materials to promote delayed, rather than instantaneous liquid–liquid demixing were associated with significant improvements in membrane conductivity. Based on the results, a potential use of such membranes in direct methanol fuel cells looks promising.
PB  - Elsevier
T2  - Journal of Membrane Science
T1  - Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization
SP  - 254
EP  - 261
DO  - 10.1016/j.memsci.2012.02.012
ER  - 
@article{
author = "Radovanović, Filip and Kellner, Michael and Matović, Jovan and Liska, Robert and Koch, T.",
year = "2012",
url = "http://dais.sanu.ac.rs/123456789/770",
abstract = "A new method for the preparation of asymmetric membranes with an interpenetrating proton-conducting morphology, which consists of cross-linked sulfonic acid functionalized ionomers embedded within a matrix of a thermally-resistant, glassy polymer is presented. This method combines a traditional immersion precipitation process for making membranes with photopolymerization and crosslinking of functional monomers included in the casting solution. The resulting membranes have an integral top skin layer with fine proton-conducting channels on top of a coarser proton-conducting support. In-plane conductivities of some of these membranes measured at ambient temperature were significantly higher than the conductivity of Nafion membranes, while having improved methanol barrier properties. An increase in functionality and molecular weight of crosslinking agents, as well as a selection of materials to promote delayed, rather than instantaneous liquid–liquid demixing were associated with significant improvements in membrane conductivity. Based on the results, a potential use of such membranes in direct methanol fuel cells looks promising.",
publisher = "Elsevier",
journal = "Journal of Membrane Science",
title = "Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization",
pages = "254-261",
doi = "10.1016/j.memsci.2012.02.012"
}
Radovanović, F., Kellner, M., Matović, J., Liska, R.,& Koch, T. (2012). Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization.
Journal of Membrane ScienceElsevier., 254-261.
https://doi.org/10.1016/j.memsci.2012.02.012
Radovanović F, Kellner M, Matović J, Liska R, Koch T. Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization. Journal of Membrane Science. 2012;:254-261
Radovanović Filip, Kellner Michael, Matović Jovan, Liska Robert, Koch T., "Asymmetric membranes with interpenetrating proton-conducting morphology made by a combination of immersion precipitation and photopolymerization" (2012):254-261,
https://doi.org/10.1016/j.memsci.2012.02.012 .
3
7
8
7

Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids

Matović, Jovan; Jakšić, Zoran; Radovanović, Filip

(IEEE, 2012)

TY  - CONF
AU  - Matović, Jovan
AU  - Jakšić, Zoran
AU  - Radovanović, Filip
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/781
AB  - Nanomembranes represent a novel building block for nanosystems, characterized by a thickness below 100 nm and a giant aspect ratios. A typical procedure for nanomembrane fabrication starts from an ultrathin layer deposited on some kind of a sacrificial substrate. The nanomembrane is released by etching away the substrate, leaving the nanomembrane to freely float in the solvent. This solvent may be water or some other liquid. Many different types of nanomembranes can be made by this procedure, but only a limited number can survive the capillary forces during the extraction from solvent. In this paper we propose a novel, generally applicable method for freeing nanomembranes from the solvent via direct in-situ substitution of the solvent in meniscus with a low surface tension liquid. The proposed method ensures high production yields, is not very dependent on experimental skills, and avoids introduction of contaminants into the nanomembrane structure.
PB  - IEEE
C3  - Proceedings of the 28th International Conference on Microelectronics MIEL 2012
T1  - Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids
SP  - 135
EP  - 138
DO  - 10.1109/MIEL.2012.6222816
ER  - 
@conference{
author = "Matović, Jovan and Jakšić, Zoran and Radovanović, Filip",
year = "2012",
url = "http://dais.sanu.ac.rs/123456789/781",
abstract = "Nanomembranes represent a novel building block for nanosystems, characterized by a thickness below 100 nm and a giant aspect ratios. A typical procedure for nanomembrane fabrication starts from an ultrathin layer deposited on some kind of a sacrificial substrate. The nanomembrane is released by etching away the substrate, leaving the nanomembrane to freely float in the solvent. This solvent may be water or some other liquid. Many different types of nanomembranes can be made by this procedure, but only a limited number can survive the capillary forces during the extraction from solvent. In this paper we propose a novel, generally applicable method for freeing nanomembranes from the solvent via direct in-situ substitution of the solvent in meniscus with a low surface tension liquid. The proposed method ensures high production yields, is not very dependent on experimental skills, and avoids introduction of contaminants into the nanomembrane structure.",
publisher = "IEEE",
journal = "Proceedings of the 28th International Conference on Microelectronics MIEL 2012",
title = "Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids",
pages = "135-138",
doi = "10.1109/MIEL.2012.6222816"
}
Matović, J., Jakšić, Z.,& Radovanović, F. (2012). Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids.
Proceedings of the 28th International Conference on Microelectronics MIEL 2012IEEE., 135-138.
https://doi.org/10.1109/MIEL.2012.6222816
Matović J, Jakšić Z, Radovanović F. Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids. Proceedings of the 28th International Conference on Microelectronics MIEL 2012. 2012;:135-138
Matović Jovan, Jakšić Zoran, Radovanović Filip, "Transfer of nanomembranes from solution to a solid frame via reflow of low surface tension liquids" (2012):135-138,
https://doi.org/10.1109/MIEL.2012.6222816 .

Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes

Kellner, Michael; Radovanović, Filip; Liska, Robert; Matović, Jovan

(Singapore : Research Publishing, 2012)

TY  - CONF
AU  - Kellner, Michael
AU  - Radovanović, Filip
AU  - Liska, Robert
AU  - Matović, Jovan
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/782
AB  - Direct methanol fuel cells with polymer electrolyte membranes are of great interest in recent research. Several monomers and crosslinkers in a broad range of concentrations in water and NMP respectively were screened for their mechanical properties, water uptake and conductivity by photopolymerization with a polar photo initiator in porous membranes made of polypropylene and polyethersulfone, respectively. As conductive ionomer, primarily AMPS, an acrylamide with a sulfonic end group, was used. The conductive monomers were crosslinked with varying hydrophobic and hydrophilic multifunctional monomers based on (meth-) acrylates. Furthermore several new multifunctional crosslinkers based on acrylamides with enhanced thermal and ageing stability have been synthesized and tested.

The advantage of several different building blocks with known characteristics is the possibility to tune the polymer to special needs of an application. For example, some polymer compositions have good conductivity at lower temperatures, whereas other polymers develop better properties at elevated temperatures. By choosing the right building blocks we were able to achieve better proton conductivity than Nafion.
PB  - Singapore : Research Publishing
C3  - Proceedings of the 9th International Conference on Multi-Material Micro Manufacture
T1  - Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes
DO  - 10.3850/978-981-07-3353-7_303
ER  - 
@conference{
author = "Kellner, Michael and Radovanović, Filip and Liska, Robert and Matović, Jovan",
year = "2012",
url = "http://dais.sanu.ac.rs/123456789/782",
abstract = "Direct methanol fuel cells with polymer electrolyte membranes are of great interest in recent research. Several monomers and crosslinkers in a broad range of concentrations in water and NMP respectively were screened for their mechanical properties, water uptake and conductivity by photopolymerization with a polar photo initiator in porous membranes made of polypropylene and polyethersulfone, respectively. As conductive ionomer, primarily AMPS, an acrylamide with a sulfonic end group, was used. The conductive monomers were crosslinked with varying hydrophobic and hydrophilic multifunctional monomers based on (meth-) acrylates. Furthermore several new multifunctional crosslinkers based on acrylamides with enhanced thermal and ageing stability have been synthesized and tested.

The advantage of several different building blocks with known characteristics is the possibility to tune the polymer to special needs of an application. For example, some polymer compositions have good conductivity at lower temperatures, whereas other polymers develop better properties at elevated temperatures. By choosing the right building blocks we were able to achieve better proton conductivity than Nafion.",
publisher = "Singapore : Research Publishing",
journal = "Proceedings of the 9th International Conference on Multi-Material Micro Manufacture",
title = "Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes",
doi = "10.3850/978-981-07-3353-7_303"
}
Kellner, M., Radovanović, F., Liska, R.,& Matović, J. (2012). Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes.
Proceedings of the 9th International Conference on Multi-Material Micro ManufactureSingapore : Research Publishing..
https://doi.org/10.3850/978-981-07-3353-7_303
Kellner M, Radovanović F, Liska R, Matović J. Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes. Proceedings of the 9th International Conference on Multi-Material Micro Manufacture. 2012;
Kellner Michael, Radovanović Filip, Liska Robert, Matović Jovan, "Novel Crosslinker for Photopolymerization of Proton Conducting Fuel Cell Membranes" (2012),
https://doi.org/10.3850/978-981-07-3353-7_303 .

High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers

Kellner, Michael; Radovanović, Filip; Matović, Jovan; Liska, Robert

(Belgrade, Serbia : Society of Physical Chemists of Serbia, 2012)

TY  - CONF
AU  - Kellner, Michael
AU  - Radovanović, Filip
AU  - Matović, Jovan
AU  - Liska, Robert
PY  - 2012
UR  - http://dais.sanu.ac.rs/123456789/778
AB  - Proton conducting membranes were prepared by photopolymerization of 2-
acrylamido-2-methylpropane sulfonic acid solutions within the pores of polypropylene
membranes. Several commercial and novel multifunctional monomers synthesized in
IAS lab were investigated as suitable crosslinking agents for this application. Some
membranes made with synthesized crosslinkers at low crosslinker concentrations
exceeded 2.5 times the conductivity of Nafion® 115 membrane, while exhibiting a
good hydrolytical stability, in contrast to the commercial crosslinkers based on
multifunctional (meth)acrylates.
PB  - Belgrade, Serbia : Society of Physical Chemists of Serbia
C3  - Proceedings of the 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers
SP  - 492
EP  - 494
ER  - 
@conference{
author = "Kellner, Michael and Radovanović, Filip and Matović, Jovan and Liska, Robert",
year = "2012",
url = "http://dais.sanu.ac.rs/123456789/778",
abstract = "Proton conducting membranes were prepared by photopolymerization of 2-
acrylamido-2-methylpropane sulfonic acid solutions within the pores of polypropylene
membranes. Several commercial and novel multifunctional monomers synthesized in
IAS lab were investigated as suitable crosslinking agents for this application. Some
membranes made with synthesized crosslinkers at low crosslinker concentrations
exceeded 2.5 times the conductivity of Nafion® 115 membrane, while exhibiting a
good hydrolytical stability, in contrast to the commercial crosslinkers based on
multifunctional (meth)acrylates.",
publisher = "Belgrade, Serbia : Society of Physical Chemists of Serbia",
journal = "Proceedings of the 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers",
pages = "492-494"
}
Kellner, M., Radovanović, F., Matović, J.,& Liska, R. (2012). High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers.
Proceedings of the 11th International Conference on Fundamental and Applied Aspects of Physical ChemistryBelgrade, Serbia : Society of Physical Chemists of Serbia., 492-494.
Kellner M, Radovanović F, Matović J, Liska R. High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers. Proceedings of the 11th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2012;:492-494
Kellner Michael, Radovanović Filip, Matović Jovan, Liska Robert, "High performance proton conducting membranes for fuel cells made by photopolymerization of hydrolytically stable monomers" (2012):492-494

Photopolymerizable monomer formulations for nanoporous proton conducting membranes

Kellner, Michael; Radovanović, Filip; Matović, Jovan; Liska, Robert

(Singapore : Research Publishing, 2011)

TY  - CONF
AU  - Kellner, Michael
AU  - Radovanović, Filip
AU  - Matović, Jovan
AU  - Liska, Robert
PY  - 2011
UR  - http://dais.sanu.ac.rs/123456789/780
AB  - Several monomers and crosslinker in a broad range of concentrations in water and 1-Methyl-2-pyrrolidone (NMP) respectively were screened for their mechanical properties, water uptake and conductivity by photo polymerization with a polar photo initiator in porous membranes made of polypropylene and polyethersulfone respectively. As conductive polymer, primarily poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) and poly(2-sulfoethyl methacrylate) (PSEM) respectively as well as polymers of phosphonic acid containing monomers or newly synthesized monomers were used. The conductive monomers were crosslinked with varying hydrophobic and hydrophilic multifunctional monomers like N,N'-methylene bisacrylamide (MBA), 2-Propenoic acid, 2-methyl-, 1,1'-(1,10-decanediyl) ester (D3MA) or polyethyleneglycol diacrylates with two varying chainlengths (PEG-DA700, PEG-DA330). Furthermore several new multifunctional crosslinker with enhanced thermal and ageing stability have been synthesized and tested.
The advantage of several different building blocks with known characteristics is the possibility to tune the polymer to special needs of an application. For example, some polymer compositions have good conductivity at lower temperatures whereas other polymers develop better properties at elevated temperatures.
PB  - Singapore : Research Publishing
C3  - Proceedings of the 8th International Conference on Multi-Material Micro Manufacture
T1  - Photopolymerizable monomer formulations for nanoporous proton conducting membranes
ER  - 
@conference{
author = "Kellner, Michael and Radovanović, Filip and Matović, Jovan and Liska, Robert",
year = "2011",
url = "http://dais.sanu.ac.rs/123456789/780",
abstract = "Several monomers and crosslinker in a broad range of concentrations in water and 1-Methyl-2-pyrrolidone (NMP) respectively were screened for their mechanical properties, water uptake and conductivity by photo polymerization with a polar photo initiator in porous membranes made of polypropylene and polyethersulfone respectively. As conductive polymer, primarily poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) and poly(2-sulfoethyl methacrylate) (PSEM) respectively as well as polymers of phosphonic acid containing monomers or newly synthesized monomers were used. The conductive monomers were crosslinked with varying hydrophobic and hydrophilic multifunctional monomers like N,N'-methylene bisacrylamide (MBA), 2-Propenoic acid, 2-methyl-, 1,1'-(1,10-decanediyl) ester (D3MA) or polyethyleneglycol diacrylates with two varying chainlengths (PEG-DA700, PEG-DA330). Furthermore several new multifunctional crosslinker with enhanced thermal and ageing stability have been synthesized and tested.
The advantage of several different building blocks with known characteristics is the possibility to tune the polymer to special needs of an application. For example, some polymer compositions have good conductivity at lower temperatures whereas other polymers develop better properties at elevated temperatures.",
publisher = "Singapore : Research Publishing",
journal = "Proceedings of the 8th International Conference on Multi-Material Micro Manufacture",
title = "Photopolymerizable monomer formulations for nanoporous proton conducting membranes"
}
Kellner, M., Radovanović, F., Matović, J.,& Liska, R. (2011). Photopolymerizable monomer formulations for nanoporous proton conducting membranes.
Proceedings of the 8th International Conference on Multi-Material Micro ManufactureSingapore : Research Publishing..
Kellner M, Radovanović F, Matović J, Liska R. Photopolymerizable monomer formulations for nanoporous proton conducting membranes. Proceedings of the 8th International Conference on Multi-Material Micro Manufacture. 2011;
Kellner Michael, Radovanović Filip, Matović Jovan, Liska Robert, "Photopolymerizable monomer formulations for nanoporous proton conducting membranes" (2011)

Asymmetric sol-gel proton-conducting membrane

Radovanović, Filip; Kellner, Michael; Matović, Jovan; Liska, Robert

(Singapore : Research Publishing, 2011)

TY  - CONF
AU  - Radovanović, Filip
AU  - Kellner, Michael
AU  - Matović, Jovan
AU  - Liska, Robert
PY  - 2011
UR  - http://dais.sanu.ac.rs/123456789/779
AB  - Proton-conducting membranes with interpenetrating polymer network morphology have gained attention in recent years for potential replacement of standard Nafion membranes in direct methanol fuel cells. These membranes generally consist of fine interpenetrating domains of proton-conducting and mechanically-supporting polymer phases, which often leads to improvements in mechanical strength and methanol barrier properties.

Asymmetric sol-gel membranes comprising proton-conducting channels of cross-linked sulfonic acid functionalized ionomers embedded within a matrix of thermally-resistant, glassy polymer were prepared by photopolymerization starting from a polymer solution and evaluated in our laboratories. These membranes have an integral top skin layer with fine biomimetic proton-conducting channels, which provides a barrier against methanol crossover, on top of a coarser proton-conducting support. Conductivity of asymmetric membranes over a range of initial polymer concentrations and ion-exchange capacities (IEC) was just slightly lower than for the corresponding symmetric membranes. Methanol barrier properties of asymmetric sol-gel membranes were better than that of Nafion 115 membrane. The crosslinking agent functionality had a major effect on membrane conductivity. Use of trifunctional crosslinking agents resulted in significantly higher conductivities than those obtained with bifunctional agents, even surpassing the conductivity of Nafion membranes.
PB  - Singapore : Research Publishing
C3  - Proceedings of the 8th International Conference on Multi-Material Micro Manufacture
T1  - Asymmetric sol-gel proton-conducting membrane
ER  - 
@conference{
author = "Radovanović, Filip and Kellner, Michael and Matović, Jovan and Liska, Robert",
year = "2011",
url = "http://dais.sanu.ac.rs/123456789/779",
abstract = "Proton-conducting membranes with interpenetrating polymer network morphology have gained attention in recent years for potential replacement of standard Nafion membranes in direct methanol fuel cells. These membranes generally consist of fine interpenetrating domains of proton-conducting and mechanically-supporting polymer phases, which often leads to improvements in mechanical strength and methanol barrier properties.

Asymmetric sol-gel membranes comprising proton-conducting channels of cross-linked sulfonic acid functionalized ionomers embedded within a matrix of thermally-resistant, glassy polymer were prepared by photopolymerization starting from a polymer solution and evaluated in our laboratories. These membranes have an integral top skin layer with fine biomimetic proton-conducting channels, which provides a barrier against methanol crossover, on top of a coarser proton-conducting support. Conductivity of asymmetric membranes over a range of initial polymer concentrations and ion-exchange capacities (IEC) was just slightly lower than for the corresponding symmetric membranes. Methanol barrier properties of asymmetric sol-gel membranes were better than that of Nafion 115 membrane. The crosslinking agent functionality had a major effect on membrane conductivity. Use of trifunctional crosslinking agents resulted in significantly higher conductivities than those obtained with bifunctional agents, even surpassing the conductivity of Nafion membranes.",
publisher = "Singapore : Research Publishing",
journal = "Proceedings of the 8th International Conference on Multi-Material Micro Manufacture",
title = "Asymmetric sol-gel proton-conducting membrane"
}
Radovanović, F., Kellner, M., Matović, J.,& Liska, R. (2011). Asymmetric sol-gel proton-conducting membrane.
Proceedings of the 8th International Conference on Multi-Material Micro ManufactureSingapore : Research Publishing..
Radovanović F, Kellner M, Matović J, Liska R. Asymmetric sol-gel proton-conducting membrane. Proceedings of the 8th International Conference on Multi-Material Micro Manufacture. 2011;
Radovanović Filip, Kellner Michael, Matović Jovan, Liska Robert, "Asymmetric sol-gel proton-conducting membrane" (2011)