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823 results on '"Schenning, Albertus P. H. J."'

1. Scalable Photochromic Film for Solar Heat and Daylight Management

Author

Meng, Weihao, primary, Kragt, Augustinus J. J., additional, Gao, Yingtao, additional, Brembilla, Eleonora, additional, Hu, Xiaowen, additional, van der Burgt, Julia S., additional, Schenning, Albertus P. H. J., additional, Klein, Tillmann, additional, Zhou, Guofu, additional, van den Ham, Eric R., additional, Tan, Longfei, additional, Li, Laifeng, additional, Wang, Jingxia, additional, and Jiang, Lei, additional

Published
2023
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2. Mesoscopic order and the dimentionality of long-range resonance energy transfer in supramolecular semiconductors

Author

Daniel, Clement, Makereel, Francois, Herz, Laura M., Hoeben, Freek J. M., Jonkheijm, Pascal, Schenning, Albertus P. H. J., Meijer, E. W., and Silva, Carlos

Subjects
Condensed Matter - Materials Science
Abstract

We present time-resolved photoluminescence measurements on two series of oligo-p-phenylenevinylene materials that self-assemble into supramolecular nanostructures with thermotropic reversibility in dodecane. One set of derivatives form chiral, helical stacks while the second set form less organised, frustrated stacks. Here we study the effects of supramolecular organisation on the resonance energy transfer rates. We measure these rates in nanoassemblies formed with mixed blends of oligomers and compare them with the rates predicted by Foerster theory. Our results and analysis show that control of supramolecular order in the nanometre lengthscale has a dominant effect on the efficiency and dimentionality of resonance energy transfer., Comment: 17 Pages, 5 Figures, Submitted to J. Chem. Phys

Published
2007
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3. Exciton bimolecular annihilation dynamics in supramolecular nanostructures of conjugated oligomers

Author

Daniel, Clément, Herz, Laura M., Silva, Carlos, Hoeben, Freek J. M., Jonkheijm, Pascal, Schenning, Albertus P. H. J., and Meijer, E. W.

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Materials Science
Abstract

We present femtosecond transient absorption measurements on $\pi$-conjugated supramolecular assemblies in a high pump fluence regime. Oligo(\emph{p}-phenylenevinylene) monofunctionalized with ureido-\emph{s}-triazine (MOPV) self-assembles into chiral stacks in dodecane solution below 75$^{\circ}$C at a concentration of $4\times 10^{-4}$ M. We observe exciton bimolecular annihilation in MOPV stacks at high excitation fluence, indicated by the fluence-dependent decay of $1^1$B$_{u}$-exciton spectral signatures, and by the sub-linear fluence dependence of time- and wavelength-integrated photoluminescence (PL) intensity. These two characteristics are much less pronounced in MOPV solution where the phase equilibrium is shifted significantly away from supramolecular assembly, slightly below the transition temperature. A mesoscopic rate-equation model is applied to extract the bimolecular annihilation rate constant from the excitation fluence dependence of transient absorption and PL signals. The results demonstrate that the bimolecular annihilation rate is very high with a square-root dependence in time. The exciton annihilation results from a combination of fast exciton diffusion and resonance energy transfer. The supramolecular nanostructures studied here have electronic properties that are intermediate between molecular aggregates and polymeric semiconductors.

Published
2003
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5. Hydrogen Bonding in Supramolecular Nanoporous Materials

Author

van Kuringen, Huub P. C., Schenning, Albertus P. H. J., Landfester, Katharina, Series editor, Salzer, Reiner, Series editor, Carpenter, Barry, Series editor, Ceroni, Paola, Series editor, Mahlke, Claudia, Series editor, Leszczynski, Jerzy, Series editor, Kirchner, Barbara, Series editor, Luh, Tien-Yau, Series editor, Polfer, Nicolas C., Series editor, Li, Zhan-Ting, editor, and Wu, Li-Zhu, editor

Published
2015
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10. Exciton diffusion dynamics in an organic semiconductor nanostructure

Author

Daniel, Clément, Herz, Laura M., Westenhoff, Sebastian, Makereel, François, Beljonne, David, Hoeben, Freek J. M., Jonkheijm, Pascal, Schenning, Albertus P. H. J., Meijer, E. W., Silva, Carlos, Castleman, A. W., Jr., editor, Toennies, J.P., editor, Zinth, W., editor, Kobayashi, Takayoshi, editor, Okada, Tadashi, editor, Kobayashi, Tetsuro, editor, Nelson, Keith A., editor, and De Silvestri, Sandro, editor

Published
2005
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15. Size-selective adsorption in nanoporous polymers from coumarin photo-cross-linked columnar liquid crystals

Author

Ministerio de Economía y Competitividad (España), Gobierno de Aragón, European Commission, Concellón, Alberto [0000-0002-8932-9085], Schenning, Albertus P. H. J. [0000-0002-3485-1984], Marcos, Mercedes [0000-0001-7056-3181], Serrano, José Luis [0000-0001-9866-6633], Concellón, Alberto, Schenning, Albertus P. H. J., Romero, Pilar, Marcos, Mercedes, Serrano, José Luis, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, European Commission, Concellón, Alberto [0000-0002-8932-9085], Schenning, Albertus P. H. J. [0000-0002-3485-1984], Marcos, Mercedes [0000-0001-7056-3181], Serrano, José Luis [0000-0001-9866-6633], Concellón, Alberto, Schenning, Albertus P. H. J., Romero, Pilar, Marcos, Mercedes, and Serrano, José Luis

Abstract

We have prepared nanoporous polymers from columnar hexagonal hydrogen-bonded complexes, whose order is fixed by coumarin photoinduced [2 + 2] cycloaddition (photodimerization). Two different hydrogen-bonded complexes were used and consisted of a melamine (M) or tris(triazolyl)triazine (T) derivative acting as central templates and three peripheral carboxylic acids containing coumarin units. These coumarin units were employed for the cross-linking process by photodimerization in order to fix the LC arrangement. Template removal leads to the formation of self-standing nanoporous polymers keeping the columnar hexagonal order. Two nanoporous polymers with different pore diameters were obtained depending on size of the utilized template. These polymers with carboxylic acids at the pore surface demonstrate the ability to selectively adsorb certain molecules depending on their size. Moreover, after base treatment of the nanoporous polymers, they are able to adsorb cationic dyes over anionic and larger cations, demonstrating size- and charge-selective adsorption.

Published
2018

16. Epitaxial growth of light-responsive azobenzene molecular crystal actuators on oriented polyethylene films

Author

Varghese, Shaji, Fredrich, Sebastian, Vantomme, Ghislaine, Prabhu, Sugosh R., Teyssandier, Joan, de Feyter, Steven, Severn, John, Bastiaansen, Cees W. M., Schenning, Albertus P. H. J., Varghese, Shaji, Fredrich, Sebastian, Vantomme, Ghislaine, Prabhu, Sugosh R., Teyssandier, Joan, de Feyter, Steven, Severn, John, Bastiaansen, Cees W. M., and Schenning, Albertus P. H. J.

Abstract

We report on the epitaxial growth of photoresponsive alkyl-substituted azobenzene fibres on top of uniaxially oriented polyethylene (PE) films. In these fibres, the alkyl chains are oriented parallel with regard to the drawing direction of PE, whereas the azobenzene moieties pack into a roughly 60° angle. The bilayer films act as a light responsive actuator generating an actuation stress of about 3 MPa.

Published
2020

17. Dual Light and Temperature Responsive Micrometer-Sized Structural Color Actuators

Author

Belmonte, Alberto, Ussembayev, Yera Ye, Bus, Tom, Nys, Inge, Neyts, Kristiaan, Schenning, Albertus P. H. J., Belmonte, Alberto, Ussembayev, Yera Ye, Bus, Tom, Nys, Inge, Neyts, Kristiaan, and Schenning, Albertus P. H. J.

Abstract

Externally induced color- and shape-changes in micrometer-sized objects are of great interest in novel application fields such as optofluidics and microrobotics. In this work, light and temperature responsive micrometer-sized structural color actuators based on cholesteric liquid-crystalline (CLC) polymer particles are presented. The particles are synthesized by suspension polymerization using a reactive CLC monomer mixture having a light responsive azobenzene dye. The particles exhibit anisotropic spot-like and arc-like reflective colored domains ranging from red to blue. Electron microscopy reveals a multidirectional asymmetric arrangement of the cholesteric layers in the particles and numerical simulations elucidate the anisotropic optical properties. Upon light exposure, the particles show reversible asymmetric shape deformations combined with structural color changes. When the temperature is increased above the liquid crystal-isotropic phase transition temperature of the particles, the deformation is followed by a reduction or disappearance of the reflection. Such dual light and temperature responsive structural color actuators are interesting for a variety of micrometer-sized devices. © 2019 Eindhoven University of Technology. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Published
2020

18. Interchromophoric coupling in oligo(p-phenylenevinylene)-substituted poly(propyleneimine) dendrimers

Author

Meskers, Stefan C. J., Bender, Markus, Hubner, Jens, Romanovskii, Yu. V., Oestreich, Michael, Schenning, Albertus P. H. J., Meijer, E. W., and Bassler, Heinz

Subjects
Chemistry, Physical and theoretical -- Research, Photochemical research -- Analysis, Fluorescence -- Physiological aspects, Emission spectroscopy -- Analysis, Solution (Chemistry) -- Physiological aspects, Polymers -- Physiological aspects, Chemicals, plastics and rubber industries
Published
2001

19. Synthesis, aggregation, and binding behavior of synthetic amphiphilic receptors

Author

Schenning, Albertus P. H. J., Escuder, Beatriu, Nunen, Johanna L. M. van, Bruin, Bas de, Lowik, Dennis W. P. M., Rowan, Alan E., Gaast, Sjerry J. van der, Feiters, Martinus C., and Nolte, Roeland J. M.

Subjects
Chemistry, Organic -- Research, Alkali metals -- Physiological aspects, Molecules -- Research, Water -- Physiological aspects, Cell membranes -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the ampliphilic bowl-shaped receptor molecules. The synthesis of these molecules has been carried out and the results indicate that these ampliphiles can form different types of aggregates upon dispersal in water and are capable of binding alkali metals.

Published
2001

20. Stable and scalable smart window based on polymer stabilized liquid crystals

Author

Hu, Xiaowen, primary, Zhang, Xinmin, additional, Yang, Wenmin, additional, Jiang, Xiao‐Fang, additional, Jiang, Xinshuai, additional, Haan, Laurens T., additional, Yuan, Dong, additional, Zhao, Wei, additional, Zheng, Nan, additional, Jin, Mingliang, additional, Shui, Lingling, additional, Schenning, Albertus P. H. J., additional, and Zhou, Guofu, additional

Published
2020
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28. One‐Pot Synthesis of Melt‐Processable Supramolecular Soft Actuators.

Author

Lugger, Sean J. D., Mulder, Dirk J., and Schenning, Albertus P. H. J.

Subjects
ACTUATORS, LIQUID crystals, ADDITION reactions, WEIGHT lifting, SUPRAMOLECULAR polymers
Abstract

The application of reprocessable and reprogrammable soft actuators is limited by the synthetic strategies, 3D‐shaping capabilities, and small deformations. In this work, melt‐processable supramolecular soft actuators based on segmented copolymers containing thiourethane and liquid crystal segments have been prepared via sequential thiol addition reactions in a one‐pot approach using commercially available building blocks. The actuators demonstrated immediate, reversible response and weightlifting capabilities with large deformations up to 32 %. Through exploiting the supramolecular cross‐links, the material could be recycled and reprogrammed into 3D actuators and welded into an actuator assembly with different deformation modes. Our work offers a one‐pot synthesis and straightforward melt‐processable approach to prepare supramolecular soft actuators with large deformations that can be reprocessed and reprogrammed into arbitrary 3D shapes. [ABSTRACT FROM AUTHOR]

Published
2022
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30. Regulating the modulus of a chiral liquid crystal polymer network by light† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c6sm00114a Click here for additional data file. Click here for additional data file

Author

Kumar, Kamlesh, Schenning, Albertus P. H. J., Broer, Dirk J., and Liu, Danqing

Subjects
Condensed Matter::Soft Condensed Matter, Chemistry, Microscopy, Polymers, Ultraviolet Rays, Transition Temperature, Stereoisomerism, Condensed Matter::Disordered Systems and Neural Networks, Azo Compounds, Phase Transition
Abstract

We provide a methodology to change the state of matter from hard and glassy to soft and rubbery by light., We report a novel way to modulate the elastic modulus of azobenzene containing liquid crystal networks (LCNs) by exposure to light. The elastic modulus can cycle between different levels by controlling the illumination conditions. Exposing the polymer network to UV light near the trans absorption band of azobenzene gives a small reduction of the glass transition temperature thereby lowering the modulus. The addition of blue light addressing the cis absorption band surprisingly amplifies this effect. The continuous oscillatory effects of the trans-to-cis isomerization of the azobenzene overrule the overall net cis conversion. The influence on the chain dynamics of the network is demonstrated by dynamic mechanical thermal analysis which shows a large shift of the glass transition temperature and a modulus decrease by more than two orders of magnitude. The initial high modulus and the glassy state are recovered within a minute in the dark by switching off the light sources, despite the observation that azobenzene is still predominantly in its cis state. Based on these new findings, we are able to create a shape memory polymer LCN film at room temperature using light.

Published
2016

31. Light-responsive Materials for Microfluidic Applications

Author

Ter Schiphorst, Jeroen, Sáez Castaño, Janire, Diamond, Dermot, Benito López, Fernando, and Schenning, Albertus P. H. J.

Subjects
stimuli responsive materials, light, microfluídics
Abstract

While the microfluidic device itself may be small, often the equipment required to control fluidics in thechip unit is large e.g. pumps, valves and mixing units, which can severely limit practical use and functionalscalability. In addition, components associated with fluidic control of the device, more specifically thevalves and pumps, contribute significantly to the overall unit cost. Here we sketch the problem of a gap between high end accurate, but expensive sensor platforms, versus less accurate, but widely employable hand-held low-cost devices. Recent research has shown that the integration of light-responsive materials within microfluidic devices can provide the function of expensive fluidic components, and potentially enable sophisticated measurements to be made using much less expensive equipment. An overview of the most recent developments will be presented for valves, mixers, transport and sample handling inside microfluidic devices. The authors would like to acknowledge the many discussions and contributions with all of our former and current colleagues. Their names are given in the references cited. A special word of thanks is expressed to all “NAPES” members for many inspiring discussions and fruitful collaborations. The authors acknowledge funding for this research under the European Union's Seventh Framework Programme (FP7) for research, technological development and demonstration, through the NAPES project grant agreement no. 604241. F. B.-L. acknowledges funding support from the Ramón y Cajal Programme (Ministerio de Economía y Competitividad), Spain as well as Gobierno Vasco, Dpto. Industria, Innovacion, Comercio y Turismo under ELKARTEK 2016 with Grant No. KK-2015/0000088 and Gobierno de España, Ministerio de Economía y Competitividad, with Grant No. BIO2016-80417- P. We also acknowledge support from Science Foundation Ireland under the INSIGHT Centre initiative (SFI/12/RC/2289) and Enterprise Ireland (IP 2016 0502).

Published
2018

42. Configurable Multi‐Stable Surface Topographies: Re‐ and Preconfigurable Multistable Visible Light Responsive Surface Topographies (Small 50/2018)

Author

Hendrikx, Matthew, primary, ter Schiphorst, Jeroen, additional, van Heeswijk, Ellen P. A., additional, Koçer, Gülistan, additional, Knie, Christopher, additional, Bléger, David, additional, Hecht, Stefan, additional, Jonkheijm, Pascal, additional, Broer, Dirk J., additional, and Schenning, Albertus P. H. J., additional

Published
2018
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43. Light-responsive Materials for Microfluidic Applications

Author

Química analítica, Kimika analitikoa, Ter Schiphorst, Jeroen, Sáez Castaño, Janire, Diamond, Dermot, Benito López, Fernando, Schenning, Albertus P. H. J., Química analítica, Kimika analitikoa, Ter Schiphorst, Jeroen, Sáez Castaño, Janire, Diamond, Dermot, Benito López, Fernando, and Schenning, Albertus P. H. J.

Abstract

While the microfluidic device itself may be small, often the equipment required to control fluidics in thechip unit is large e.g. pumps, valves and mixing units, which can severely limit practical use and functionalscalability. In addition, components associated with fluidic control of the device, more specifically thevalves and pumps, contribute significantly to the overall unit cost. Here we sketch the problem of a gap between high end accurate, but expensive sensor platforms, versus less accurate, but widely employable hand-held low-cost devices. Recent research has shown that the integration of light-responsive materials within microfluidic devices can provide the function of expensive fluidic components, and potentially enable sophisticated measurements to be made using much less expensive equipment. An overview of the most recent developments will be presented for valves, mixers, transport and sample handling inside microfluidic devices.

Published
2018

44. Proton-conductive materials formed by coumarin photocrosslinked ionic liquid crystal dendrimers

Author

Ministerio de Economía y Competitividad (España), Gobierno de Aragón, European Commission, China Scholarship Council, Concellón, Alberto, Liang, Ting, Schenning, Albertus P. H. J., Serrano, José Luis, Romero, Pilar, Marcos, Mercedes, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, European Commission, China Scholarship Council, Concellón, Alberto, Liang, Ting, Schenning, Albertus P. H. J., Serrano, José Luis, Romero, Pilar, and Marcos, Mercedes

Abstract

In this work, we have successfully examined for the first time the use of ionic dendrimers as building blocks for the preparation of 1D and 2D proton conductive materials. For this purpose, a new family of liquid crystalline dendrimers has been synthesized by ionic self-assembly of poly(amidoamine) (PAMAM) dendrimers bearing 4, 8, 16, 32 or 64 NH2 terminal groups and a coumarin-containing bifunctional dendron. The noncovalent architectures were obtained by the formation of ionic salts between the carboxylic acid group of the dendron and the terminal amine groups of the PAMAM dendrimer. The liquid crystal properties have been investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). All the compounds exhibited mesogenic behavior with smectic A or hexagonal columnar mesophases depending on the generation of the dendrimer. Coumarin photodimerization was used as a crosslinking reaction to obtain liquid crystalline polymer networks. All the materials showed good proton conductive properties as the LC arrangement leads to the presence of ionic nanosegregated areas (formed by the ion pairs) that favor proton conduction.

Published
2018

45. Nanohybrid Materials with Tunable Birefringence via Cation Exchange in Polymer Films.

Author

Oosterlaken, Bernette M., Xu, Yifei, van Rijt, Mark M. J., Pilz da Cunha, Marina, Timmermans, Gilles H., Debije, Michael G., Friedrich, Heiner, Schenning, Albertus P. H. J., and Sommerdijk, Nico A. J. M.

Subjects
POLYMER films, POLYMER liquid crystals, LIQUID crystal films, SMECTIC liquid crystals, OPTICAL devices, BIREFRINGENCE, CATIONS
Abstract

In this work, a nanohybrid material based on a freestanding polymeric liquid crystal network capable of postmodification via cation exchange to tune birefringence is proposed. The smectic liquid crystal films can be infiltrated with a variety of cations, thereby changing the refractive indices (ne and no) and the effective birefringence (Δn) of the nanohybrid material, with reversible cation infiltration occurring within minutes. Birefringence could be tuned between values of 0.06 and 0.19, depending on the cation infiltrated into the network. Upon infiltration, a decrease in the smectic layer spacing is found with layer contraction independent of the induced change in birefringence. Potential applications are in the field of specialty optical devices, such as flexible, retunable reflective filters. [ABSTRACT FROM AUTHOR]

Published
2020
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