Materials Literature
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In this paper we present a theoretical study of the observed IR spectra of some samples of amber. We compare them to theoretically obtained spectra for a model of this natural polymer. The model assumes that communic acid and communol are plausible precursors in the natural polymerization of amber. We employ an electr…
We study the liquid-vapor phase behavior of a polydisperse fluid using grand canonical simulations and moment free energy calculations. The strongly nonlinear variation of the fractional volume of liquid across the coexistence region prevents naive extrapolation from detecting the cloud point. We describe a finite-siz…
Mechanical heart valves are exposed to extreme mechanical demands, which require a surface showing not only nonhaemostatic properties, but also wear resistance and low friction. As alternative to different forms of amorphous carbon (a-C), so-called diamond-like carbon (DLC), the suitability of boron carbonitride (BCN)…
We propose a systematic coarse-grained representation of block copolymers, whereby each block is reduced to a single ‘soft blob’ and effective intra- as well as intermolecular interactions act between centres of mass of the blocks. The coarse-graining approach is applied to simple athermal lattice models of symmetric…
The high temperature deformation behavior of Mg single crystals was precisely investigated using orientation imaging microscopy. For this purpose, Mg single crystals of various orientations were tensile tested in vacuum at temperatures between 473 and 673 K. A strain rate of 4.2 × 10−4 s−1 was employed. The elongation…
Abstract A novel thermoresponsive shell crosslinked three‐layer onion‐like polymer particles were prepared using hyperbranched polyglycerol (PG) as parents compound, the periphery hydroxyl groups of PG were transformed into trithiocarbonates (SC(S)S) first; then, it was used as chain transfer agent to prepare star‐l…
A series of homo- and copolymers containing different photochromic dithienylethene (DTE) architectures was prepared by ring-opening metathesis polymerization (ROMP) techniques. Each DTE structure can be uniquely addressed in the two- and three-component copolymers, providing a means to generate a wide range of colors…
Through elastic neutron scattering we investigated the fast dynamics of lysozyme in hydrated powder form or embedded in glycerol-water and glucose-water matrices. We calculated the relaxational contribution to the mean square displacements of protein hydrogen atoms. We found that the inverse of this quantity is linear…
Abstract Summary: We report here a study on the microstructure formation process of polymeric nanoparticles based on polyelectrolyte complexes. When polyanion poly(acrylic acid) (PAA) was dropped into polycation chitosan (CS) solution, CS‐PAA nanoparticles with diverse microstructure would be formed under different ex…
The crystal morphology of adipic acid (AA) and its mediation by the action of the homologous additives, caproic acid, glutaric acid, and succinic acid, has been investigated via computational molecular modeling-based simulation techniques (Clydesdale, G.; Docherty, R.; Roberts, K. J. HABIT95, Quantum Chemistry Program…
Herein we report the oxidative chemical polymerization of thieno[3,4-b]thiophene (T34bT) using several different oxidants including ferric sulfate, ammonium persulfate, and hydrogen peroxide in the presence of poly(styrenesulfonic acid) in water and properties of the resulting poly(thieno[3,4-b]thiophene)-poly(styrene…
The magnetic properties of $L\mathrm{Ba}{\mathrm{Co}}_{2}{\mathrm{O}}_{5+\ensuremath{\gamma}}$ cobalt oxides with different types of oxygen ions ordering within $[L{\mathrm{O}}_{\ensuremath{\gamma}}]$ layers are discussed. Symmetry arguments are used to analyze the models of the magnetic ground state proposed for thes…
A novel ferromagnetic/semiconductor oxide nanocomposite formed by arrays of Ni nanocylinders grown by the electrodeposition technique in a semiconductor oxide matrix of self-aligned and randomly disordered titanium dioxide nanotubes has been synthesized. X-ray diffraction, EDX, SEM, AFM, rf-GDOES and VSM magnetometry…
Abstract A thermodynamic study on the interaction between magnesium ion and human growth hormone (hGH) was studied at 27°C in NaCl solution (50 mM) using different techniques. Two techniques of ionmetry using a Mg 2+ selective membrane electrode and isothermal titration calorimetry were applied to obtain the binding i…
Nanocrystals – your flexible friends! The use of nanocrystals as precursors for the one-step formation of flexible functional films by using an air plasma is demonstrated. This treatment does not harm the photoluminescence of the individual nanocrystal building blocks but confers on them resilience to bending as well…
We demonstrated the use of electrohydrodynamic atomization to prepare uniform-sized emulsion droplets in which equal spheres of silica or polystyrene were dispersed. The size of the emulsion droplets was easily controlled by the electric field strength and the flow rate, independently of the diameter of the nozzles. D…
This work demonstrates the first example of the controlled organization of semiconducting nanoparticles (NPs) using amphiphilic block copolymer self-assembly at the air-water interface. Preferential interactions between polystyrene-functionalized NPs and the polystyrene block of an amphiphilic polystyrene-b-poly(ethyl…
High temperature heat treatment (HTT) of bundled single-walled carbon nanotubes (SWNTs) in vacuum ( approximately 10(-5) Torr) has been found to lead to the formation of two types of graphitic nanoribbons (GNRs), as observed by high-resolution transmission electron microscopy. Purified SWNT bundles were first found to…
Three novel cyanide-bridged heterobimetallic coordination polymers have been synthesized by hydrothermal routes, in superheated water solutions, by using K3[Co(CN)6], NiCl2.6H2O, and alpha-diimine ligands: [Ni(CN)4Co(phen)] (1; phen = 1,10-phenanthroline), [Ni(CN)4Co(2,2'-bipy)] (2; 2,2'-bipy = 2,2'-bipyiridine), and…
Vinyl acetate is processed to produce polymers and copolymers used in water based paints, adhesives, paper coatings or nonwoven binders and various applications at moderate temperatures. The polymerization processes used include solution, suspension and emulsion processes. Many incidents involving the runaway polymeri…