Materials Literature
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A controlled cross-linking polymerization system was designed, and soluble chemically cross-linked polyurethane was synthesized using laurylamine, n-octylamine, n-pentylamine, and ethylenediamine chain extenders. The mechanical analysis showed that the polyurethane materials synthesized in this paper have very excelle…
Through an interplay between atomistic thermodynamics, isotherm models, and kinetics, all based on density functional theory calculations, we propose a mechanism for the removal of the $(1\ifmmode\times\else\texttimes\fi{}2)$ missing-row reconstruction on Au(110) under high CO pressure. Elevating the pressure from ult…
The formation of lyotropic solutions in water has yet to be reported for polyaramides. In this work, we investigate the synthesis and properties of a water-soluble polyaramid via the inclusion of a sulfonated monomer in the backbone of the polymer chain. Using sulfonated terephthalic acid (sTA) together with a diamine…
Abstract The graft copolymerization of methyl methacrylate (MMA) onto sodium salt of partially carboxymethylated guar gum (Na‐PCMGG; degree of substitution = 0.497) with ceric ammonium nitrate as a redox initiator in an aqueous medium was studied. The optimized reaction conditions affording the maximum percentage of g…
New MoS2–C60 composite layered crystals built of alternating MoS2 and C60 molecular layers and with unusual diffraction contrast (see Figure) have been grown via a catalyzed transport reaction using fullerene C60. A model structure of these layered composites is proposed based on transmission electron microscopy, elec…
We show, using spatially resolved energy loss spectroscopy in a transmission electron microscopy (TEM), that GeO2 and GeO2–SiO2 glasses are extremely sensitive to high energy electrons. Ge nanoparticles can be precipitated in GeO2 glasses efficiently by the high-energy electron beam of a TEM. This is relevant to TEM c…
We have shown that, in the presence of a strong ac magnetic field, the parametric interaction of two weak acoustic waves occurs in a crystal of molecular magnets. Any magnetic molecule is subject to a dc magnetic field perpendicular to its easy anisotropy axis. The ac magnetic field is parallel to this axis. The frequ…
Abstract 1‐Substituted pyrroles such as 1‐(hydroxymethyl)pyrrole, 1‐(3‐hydroxypropyl) pyrrole, 1‐ H ‐1‐pyrrolylmethyl 4‐methyl‐1‐benzenesulfonate, 1‐ H ‐1‐pyrrolylpropyl 4‐methyl‐1‐benzenesulfonate, and 1‐ H ‐pyrrolylmethyloctanoate were synthesized and oxidative polymerized and copolymerized with pyrrole by using (NH…
Abstract Summary: Organic‐inorganic hybrid materials consisting of nanosized silica particles with surface grafted PS or PS‐ b ‐PMMA were synthesized using ATRP. These hybrid materials were used in the fabrication of highly‐ordered isoporous membranes. Optical characterization revealed that the membranes consisted of…
Photostable naphthalocyanines (see Figure) can act as optical limiters, simultaneously absorbing nanosecond laser pulses at 532 nm and 1064 nm. In these naphthalocyanines, where M can correspond to Zn, InCl, or In(p-trifluoromethylphenyl), the pattern of substitution and the nature of the substituents were found to be…
Abstract This research discusses the properties of hybrid materials formed by polyvinylpyrrolidone (PVP) and tetraethoxysilane (TEOS) of different weight ratios, by the sol–gel process, to evaluate the feasibility of its application to process‐dyed nylon fabrics. After using equipment including FTIR, 13 C‐NMR, and SEM…
Electronic structures of multiferroic $R\mathrm{Mn}{\mathrm{O}}_{3}$ $(R=\mathrm{Y},\mathrm{Er})$ have been investigated by employing photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). We have found that Mn ions in $R\mathrm{Mn}{\mathrm{O}}_{3}$ are in the trivalent high-spin state with the tota…
Using pulsed-laser deposition, a two-step growth technique was applied to epitaxial SrTiO3 (STO) thin films on LaAlO3 substrates providing a way to obtain an effective strain relaxation in these films otherwise strained due to lattice mismatch between film and substrate. By changing the thickness of a first layer, dep…
The Curie temperature ${T}_{c}$ of ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{A}}_{0.3}{\mathrm{CoO}}_{3}$ ($A=\mathrm{Ca}$, Sr, Ba) thin films was studied as a function of the film thickness $d$ for $400\phantom{\rule{0.3em}{0ex}}\mathrm{nm}>d\ensuremath{\geqslant}2.6\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. A fini…
A new type of amphiphilic ABC triblock copolymer, poly(acrylic acid)(33)-poly(styrene)(47)-poly(ethylene oxide)(113) (PAA(33)-PS(47)-PEO(113)), was designed to assist the synthesis of core/shell structured CdTe nanowires via a one-step synthetic route. The PAA block was adopted to capture cadmium ions as the precursor…
Transparent and colorless AlPO 4 gel and glass are prepared via a simple aqueous sol–gel route using aluminum lactate and phosphoric acid as precursors. The stoichiometric AlPO 4 glass derived from this sol–gel route has a mesoporous structure with a surface area of 504 m 2 /g after calcination to 600°C. With increasi…
What is the design principle of a discotic liquid crystal? Up to now, such systems have involved a more or less rigid core surrounded by flexible side groups that point outward. Herein, shape-persistent macrocycles are introduced with flexible side chains that have intraannular positions (see picture).
Persistence of infection can occur when the host immune response is compromised because of the presence of a foreign implant. Surface modification of biomaterials with phospholipid polymers may enhance biocompatibility and reduce incidence of infection by impeding bacterial and leukocyte adhesion. A rotating disk mode…
Abstract A series of alumina supported Pd‐ZnO catalysts were synthesized and studied for methanol steam reforming. Pd loading and Pd/Zn ratio were optimized to improve catalyst activities. Among all the catalysts studied, the catalyst with a Pd loading of 8.9 wt % and a Pd/Zn molar ratio of 0.38 exhibited the highest…
Traditional vanadate glasses are known to be totally black (see inset Figure), while their crystal counterparts are promising laser materials due to their large stimulated-emission cross-section. In this work, a novel transparent vanadate glass (see main Figure) is realized for the first time. Furthermore, when doped…