Boiko, N. I.; Bugakov, M. A.; Chernikova, E. V.; Piryazev, A. A.; Odarchenko, Ya I.; Ivanov, D. A.; Shibaev, V. P.
Liquid crystalline side-chain triblock copolymers consisting of a nematic central subblock edged by photochromic azobenzene-containing fragments: their synthesis, structure and photooptical behaviour
For the first time, symmetrical photosensitive fully liquid crystalline side chain triblock copolymers (pAzo-b-pPhM-b-pAzo) and random copolymers (pAzo-ran-pPhM) with nematogenic phenyl benzoate (PhM) and photosensitive smectogenic azobenzene containing groups (Azo) were synthesized by the combination of RAFT polymerization and subsequent chemical modification. The central block of synthesized…
Molecular architecture of the Jumonji C family histone demethylase KDM5B
Jerzy Dorosz, Line Hyltoft Kristensen, Nanda G. Aduri, Osman Mirza, Rikke Lousen, Saskia Bucciarelli, Ved Mehta, Selene Sellés-Baiget, Sara Marie Øie Solbak, Anders Bach, Pablo Mesa, Pablo Alcon Hernandez, Guillermo Montoya, Tam T. T. N. Nguyen, Kasper D. Rand, Thomas Boesen & Michael Gajhede
The full length human histone 3 lysine 4 demethylase KDM5B (PLU-1/Jarid1B) has been studied using Hydrogen/Deuterium exchange mass spectrometry, homology modelling, sequence analysis, small angle X-ray scattering and electron microscopy ...
Size-exclusion chromatography small-angle X-ray scattering of water soluble proteins on a laboratory instrument
S. Bucciarelli, S. R. Midtgaard, M. Nors Pedersen, S. Skou, L. Arleth and B. Vestergaard
Coupling of size-exclusion chromatography with biological solution small-angle X-ray scattering (SEC-SAXS) on dedicated synchrotron beamlines enables structural analysis of challenging samples such as labile proteins and low-affinity complexes...
A multi-scale investigation on effects of hydrogen bonding on micro-structure and macro-properties in a polyurea
Li, Ting; Zhang, Cheng; Xie, Zhining; Xu, Jun; Guo, Bao-Hua
Effects of hydrogen bonding on the micro-structure development and mechanical properties of a bulk-polymerized Polyurea are systematically investigated from the perspective of temperatures. A two-stage temperature dependence of bidentate hydrogen bonding among hard domains, namely, slight dissociation from 85 °C to 165 °C and dramatic destruction above 165 °C, are revealed by Fourier…
A sumatriptan coarse-grained model to explore different environments: interplay with experimental techniques
Wood, Irene; Albano, Juan M. R.; Filho, Pedro L. O.; Couto, Veronica Muniz; de Farias, Marcelo A.; Portugal, Rodrigo V.; de Paula, Eneida; Oliveira, Cristiano L. P.; Pickholz, Monica
In this work, we developed a coarse-grained model of sumatriptan suitable for extensive molecular dynamics simulations. First, we confirmed the interfacial distribution of this drug in bilayers through cryogenic transmission electron microscopy and small-angle X-ray scattering techniques, as was predicted by our previous atomistic simulations. Based on these simulations, we…
A temperature-responsive supramolecular hydrogel: preparation, gel–gel transition and molecular aggregation
Wang, Lin; Shi, Xuefeng; Wang, Jinben
In this study, a novel supramolecular hydrogel, abbreviated as AGC16/NTS, was designed and constructed by the molecular self-assembly of a cationic gemini surfactant, 1,3-bis(N,N-dimethyl-N-cetylammonium)-2-propylacrylatedibromide (AGC16), and an anionic aromatic gelator, trisodium 1,3,6-naphthalenetrisulfonate (NTS). The AGC16/NTS hydrogel was able to form in a mass ratio range of AGC16 and NTS…
Aerogels of hierarchically porous syndiotactic polystyrene with a dielectric constant near to air
Joseph, Angel Mary; Nagendra, Baku; Shaiju, P.; Surendran, K. P.; Gowd, E. Bhoje
Herein ultralow density aerogels are developed through a feasible freeze casting technique. Briefly, the syndiotactic polystyrene (sPS) gel was prepared using xylene and subjected to successive steps of solvent exchange using non-solvents like ethanol and water. These samples were freeze-dried to obtain aerogels of the same shape and size as…
Acceleratory and inhibitory effects of uniaxial tensile stress on the photo-oxidation of polyethylene: Dependence of stress, time duration and temperature
Liu, Qiang; Yang, Heng; Zhao, Jincan; Liu, Shixiang; Xia, Lei; Hu, Ping; Lv, Yadong; Huang, Yajiang; Kong, Miqiu; Li, Guangxian
The photo-oxidation behavior of high density polyethylene (HDPE) subjected to uniaxial tensile stress is investigated at various temperatures, tensile stress levels and time durations. The effect of stress on the photo-oxidation rate of HDPE is found to be non-monotonous. Tensile stress is found to play distinctly different roles, namely showing…
Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1
Zorn, Reiner; Yin, Huajie; Lohstroh, Wiebke; Harrison, Wayne; Budd, Peter M.; Pauw, Brian R.; Böhning, Martin; Schönhals, Andreas
Polymers with intrinsic microporosity are promising candidates for the active separation layer in gas separation membranes. Here, the vibrational density of states (VDOS) for PIM-1, the prototypical polymer with intrinsic microporosity, is investigated by means of inelastic neutron scattering. The results are compared to data measured for a more conventional…
Are Keggin’s POMs Charged Nanocolloids or Multicharged Anions?
Malinenko, Alla; Jonchère, Alban; Girard, Luc; Parrès-Maynadié, Sandra; Diat, Olivier; Bauduin, Pierre
Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM–POM electrostatics repulsions on their self-diffusion in water by varying POM and supporting salt concentrations. The self-diffusion coefficients of two Keggin’s POMs [silicotungstate (SiW12O404–)…