Cosby, T.; Vicars, Z.; Heres, M.; Tsunashima, K.; Sangoro, J.
Dynamic and structural evidence of mesoscopic aggregation in phosphonium ionic liquids
The Journal of Chemical Physics, 2018, vol 148, 19, pp. 193815DOI:10.1063/1.5009765Visit the full articleBack to the overview
Proton conductive cationic nanoporous polymers based on smectic liquid crystal hydrogen-bonded heterodimers
Mulder, Dirk-Jan; Liang, Ting; Xu, Yifei; Schiphorst, Jeroen ter; Scheres, Luc M. W.; Oosterlaken, Bernette M.; Borneman, Zandrie; Nijmeijer, Kitty; Schenning, Albertus P. H. J.
The fabrication of a cationic nanoporous smectic liquid crystal network (LCN) based on hydrogen bonded heterodimers is presented. The method relies on a supramolecular complex made from a pyridyl bearing reactive mesogen hydrogen bonded to a non-reactive benzoic acid template. Upon addition of a cross-linker, a smectic liquid crystalline phase…
Correlating molecular and crystallization dynamics to macroscopic fusion and thermodynamic stability in fused deposition modeling; a model study on polylactides
Srinivas, Varun; van Hooy-Corstjens, Catharina S. J.; Harings, Jules A. W.
To define molecular parameters for fused deposition modeling of mechanically integral polylactide parts, the effect of intrinsic local heat fluctuations on morphology and structure evolution is studied. Macroscopic fusion during melt deposition is governed by molecular dynamics of solidification and positively affected by low print speed, low molar mass. However,…
In Operando Small-Angle X-ray Scattering Investigation of Nanostructured Polymer Electrolyte for Lithium-Ion Batteries
Möhl, Gilles E.; Metwalli, Ezzeldin; Müller-Buschbaum, Peter
Electrochemical energy storage still presents one of the biggest challenges that society has to face by developing alternative lithium-ion batteries (LIBs) as they already satisfy important preconditions by providing the highest energy and power densities of all battery systems. Nowadays, the employed liquid electrolytes in LIBs do not merge the…
Long Walks in Hierarchical Porous Materials due to Combined Surface and Configurational Diffusion
Vattipalli, Vivek; Qi, Xiaoduo; Dauenhauer, Paul J.; Fan, Wei
Hierarchical materials with porous structures at different length scales (i.e., micropore and mesopore) are an emerging class of materials. However, the lack of fundamental understanding of mass transport properties significantly limits rational development of these materials for applications in catalysis and separation. In this study, we evaluated the mass transport…
Ion Transport and Interfacial Dynamics in Disordered Block Copolymers of Ammonium-Based Polymerized Ionic Liquids
Harris, Matthew A.; Heres, Maximilian F.; Coote, Jonathan; Wenda, André; Strehmel, Veronika; Stein, Gila E.; Sangoro, Joshua
A series of diblock copolymers bearing a polymerized ionic liquid (polyIL) block (poly(N-(methacryloyloxy)ethyl-N,N-dimethyl-N-ethylammonium bis(trifluoromethylsulfonyl)imide)) and a noncharged block (poly(methyl methacrylate) (PMMA)) or poly(n-butyl methacrylate) (PBuMA)) were studied using differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), wide-angle X-ray scattering…
A long-chain protic ionic liquid inside silica nanopores: enhanced proton mobility due to efficient self-assembly and decoupled proton transport
Garaga, Mounesha N.; Dracopoulos, Vassilios; Werner-Zwanziger, Ulrike; Zwanziger, Josef W.; Maréchal, Manuel; Persson, Michael; Nordstierna, Lars; Martinelli, Anna
We report enhanced protonic and ionic dynamics in an imidazole/protic ionic liquid mixture confined within the nanopores of silica particles. The ionic liquid is 1-octylimidazolium bis(trifluoromethanesulfonyl)imide (), while the silica particles are microsized and characterized by internal well connected nanopores. We demonstrate that the addition of imidazole is crucial to…
Cellulose gelation in NaOH solutions is due to cellulose crystallization
Pereira, Ana; Duarte, Hugo; Nosrati, Pegah; Gubitosi, Marta; Gentile, Luigi; Romano, Anabela; Medronho, Bruno; Olsson, Ulf
Cellulose gelation in 2 M NaOH aqueous solution was followed by time resolved turbidity and rheology measurements. The kinetics of gelation is observed to change from several hours down to few seconds when the temperature is increased from 25 to 30 °C. The increase of turbidity upon gelation demonstrates the…
Complex effect of graphite nanoplatelets on performance of HDPE/PA66 microfibrillar composites
Kelnar, Ivan; Bal, Ümitcan; Zhigunov, Alexander; Kaprálková, Ludmila; Fortelný, Ivan; Krejčíková, Sabina; Kredatusová, Jana
The effect of nanofillers (NF) on parameters of polymer blends in microfibrillar composites (MFC) is complex due the effect of NF on melt drawing. This work concerns HDPE/PA66 modified with graphite nanoplatelets (GNP) prepared by different mixing protocols. GNP influence the dispersed phase size in the original blend negligibly and…
Effects of isolated chemical and mechanical degradation stressors on the ionomer morphology in fuel cell membranes
Venkatesan, Senthil Velan; Kjeang, Erik
The present work aims to understand the specific effects of isolated chemical and mechanical degradation stressors on the morphology and physico-chemical properties of fuel cell membranes. Chemical and mechanical degradation stressors are isolated in two specific, carefully designed accelerated stress tests of fuel cells. Degraded membranes are then extracted and…