Materials Literature
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Undulator radiation is the X-ray source of choice for modern macromolecular crystallography beamlines. Here, the basic properties of undulator sources are described and it is indicated why they make such good X-ray sources for macromolecular crystallography. Collection of excellent data from these beamlines is not alw…
Abstract In this study, the viscoelastic phase separation process was studied further by time‐resolved light scattering, differential scanning calorimetry, and scanning electron microscopy in the system of poly(ether imide)‐modified bisphenol‐A dicyanate. It was observed that the evolution time of phase structure and…
Reactions between kaolin and inorganic salts, such as sodium hydrogen sulfate and ammonium sulfate, or inorganic acids, such as hydrochloric acid and sulfuric acid, can be focused either on the production of Al or on the adjustment of the silica-to-alumina ratio of the kaolin. On the basis of adjusting the silica-to-a…
The dynamics of the photoinduced phase transition (PIPT) has been investigated for the Co-Fe cyanides film, ${\mathrm{Na}}_{0.6}{\mathrm{Co}}_{1.3}[\mathrm{Fe}{(\mathrm{CN})}_{6}]∙4{\mathrm{H}}_{2}\mathrm{O}$, by means of the transient absorption spectroscopy. At low temperatures $(\ensuremath{\lesssim}150\phantom{\ru…
The adsorption of tetraethylammonium perfluorooctylsulfonate (TEA-FOS) from aqueous solution onto hydroxylated germanium is studied using in situ polarized attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The adsorption is monitored at a series of bulk solution concentrations spanning fr…
The temperature dependent resistivity and thermoelectric power of monovalent (Ag) doped La 0.7 Sr 0.3− x Ag x MnO 3 polycrystalline pellets ( x = 0.05,0.10,0.20,0.25) between 20 and 450 K are reported. Ag substitution enhances the conductivity of this system. The Curie temperature ( T C ) also increases from 303 to 36…
A divergent route for the synthesis of carbosilane wedges that contain either a bromine or amine as focal point has been developed. These new building blocks enable the construction of various core-functionalized carbosilane dendrimers. As a typical example carbosilane dendrimers up to the third generation containing…
We have found that the adsorption of octadecyltrichlorosilane (OTS) monolayers on nanometer-sized silica particles yields a broad blue photoluminescence (PL) with a time scale of nanoseconds. The observed PL intensity increases after curing at temperatures from ∼100 to ∼300°C, suggesting that condensations between adj…
Two families of liquid crystal dendrimers consisting of a dendrimeric core [fourth and fifth generations of poly(amidoamine) (PAMAM) and poly(propyleneimine) (DAB)] and several large-sized mesogenic units (incorporating three, six, and nine terminal alkoxy chains) have been prepared. The study of these materials revea…
The Ruddlesden–Popper-type layered perovskite tantalates, H2ATa2O7 (A = Sr or La2/3), were pillared with n-alkylamines and oxide nanoparticles for the first time. H2SrTa2O7 can accommodate n-alkylamines (carbon numbers = 4, 8, 12, 16) to form intercalation compounds. A linear relationship is observed between the inter…
In this article a practical mass-spring system was developed to simulate the draping of woven and knitted fabrics. The material properties important to fabric drape, including aerial density, tensile, shear, and bending properties were measured using the Kawabata Evaluation System and the experimental data were incorp…
Nanocomposites were prepared from acrylonitrile–butadiene rubber (NBR), vinyl groups containing organically modified montmorillonite and additives, such as zinc oxide, stearic acid, and sulfur. The organically modified montmorillonites used in these nanocomposites were prepared by ion exchange reactions of N,N'-dimeth…
The current situation and possible future development of macromolecular crystallography are reviewed. The rapid progress and maturation of this field in recent years have to a large extent been made possible by the inspiration and generous support of several active structural genomics initiatives. Two tendencies can b…
As crack propagation in oxide materials at low crack velocities is partly determined by chemical corrosion, proper knowledge of the crack tip chemistry is crucial for understanding fracture in these materials. Such knowledge can be obtained only from in situ studies because the processes that occur in the highly confi…
Abstract The surface properties of polymer nanofibers are of importance in many applications. In this study, the electrospun polyamide nanofibers were used as substrates for creating functional coating on the nanofiber surfaces. A direct current (DC) sputter coating was used to deposit functional silver nanofilm onto…
Water soluble spermine, spermine-naphthalimide, and pyridinium-substituted 1,8-naphthalimide derivatives have been synthesized as nucleotide-specific binding agents. Both mono- and bifunctionalized spermine compounds were studied. The photophysical properties of each compound were studied by using time-resolved and st…
The influence of the loop density of rib 1: 1 fabric preform made from GF-PP commingled yarn on the tensile properties of the composites is investigated. Six samples of rib 1: 1 fabric preform with different loop densities are studied. It has been found that the tensile strength of composites show an increase followed…
We investigate the stress–strain relationship and elastic stability of zinc-blende GaP, GaN, InP and BN lattices under hydrostatic pressure by first-principles calculation. A simple and direct ab initio implementation for studying the mechanical properties of cubic crystals is developed. The four phases' full-set stre…
We report the first direct observation of the formation process of an alumina nanowire (ANW) array from a porous anodic alumina (PAA) membrane employing a simple droplet etching method, not a general immersion etching method, using field emission scanning electron spectroscopy (FESEM). The PAA membrane is prepared by…
Nano- and microhydrogels were fabricated in water by first to third generation triethoxysilyl focal poly(amido amine) dendrons with hexyl spacer. The focal points of dendrimers were hydrolyzed and covalent-bonded through the simple sol-gel process at an acidic or basic catalytic condition. The growth of aggregates and…