Materials Literature
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Abstract In an attempt to develop a desirable resin formulation for spilled oil absorption, segmented polyurethanes of various types and lengths of hard and soft segments have been synthesized and tested for X‐ray diffraction, thermal, mechanical, and dynamic mechanical properties in addition to oil and water absorpti…
The magnetic, resistive, and structural properties of $A$-site layer-ordered ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ materials ($x=0.44$, 0.48, 0.5, and 0.52) have been investigated. Ferromagnetic properties have been observed for samples with $x<0.5$. Ferromagnetic and antife…
Abstract In this work, fluorine‐containing copolyimides were synthesized from 6FDA dianhydride and different ratios of BisAAF and PPD diamines. Properties, such as composition, viscosity, dielectric constant, glass‐transition temperature, thermal decomposition temperature, tensile characteristics, and transmittance, w…
A numerical simulation of the aircraft impact into the exterior columns of the World Trade Center (WTC) was done using LS-DYNA. For simplification, the fuselage was modeled as a thin-walled cylinder, the wings were modeled as box beams with a fuel pocket, and the engines were represented as rigid cylinders. The exteri…
Different characterization methods (optical microscopy, Karl Ficher titration (KF), XRPD, and solid-state FTIR) were used to identify the two polymorphs and one hydrate of stavudine. The two forms are monotropically related, and form 1 is the stable polymorph. The effects of solvent, impurities, supersaturation, and m…
Abstract We studied the condensing reaction of sebacic acid and glycerol and prepared biodegradable elastomers. Swelling experiments proved that the elastomers were crosslinked polyesters consisting of both insoluble parts (gel) and soluble parts (sol), but the content of sol was higher than gel. X‐ray diffraction ana…
Abstract This article describes the preparation, characterization, and properties of thermoplastic vulcanizate (TPV)/silica nanocomposites. The nanocomposites were prepared by the melt blending of TPV and maleic anhydride grafted polypropylene (mPP) into organically modified SiO 2 (m‐SiO 2 ), treated with n ‐hexadecyl…
Organoclays with thiol functionalities pending in the interlayer space were prepared by a single-template sol−gel synthesis. With magnesium nitrate, aluminum acetylacetonate, and mercaptopropyltrimethoxysilane involved, the reaction was established at room temperature. Characterizations were carried out using X-ray di…
We investigate the local proton dynamics in the proton conducting hydrated perovskite system $\mathrm{Ba}{\mathrm{In}}_{x}{\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{O}}_{3\ensuremath{-}x∕2}\phantom{\rule{0.3em}{0ex}}(x=0.25\text{--}0.75)$ using infrared spectroscopy and first-principles calculations. We show that oxygen…
Abstract A series of La 0.6 Sr 0.4 Co 0.4 Fe 0.6 O 3‐δ (LSCF) perovskite‐type oxides were synthesized using a modified citrate process under various pH conditions (pH =1, 3, 5, 7, and 9, respectively). The effect of pH on the chelate process, crystal development, morphology, and oxygen permeability of LSCF oxides were…
We present a phenomenological theory of the uniaxial and biaxial nematic phases recently observed in bent-core mesogenic systems. To take into account the molecular anisotropy we introduce two types of symmetry transformation: "external" rotations which turn the molecules with respect to the laboratory axes and "inter…
The Fermi surface of the layered charge-density-wave compound $2H\text{\ensuremath{-}}{\mathrm{TaSe}}_{2}$ is measured by angle-resolved photoemission as a function of temperature. A surprising Fermi-surface topology and a Fermi-surface branch-dependent charge-density-wave gap are found. In the charge-density-wave sta…
Recently, the importance of proline ring pucker conformations in collagen has been suggested in the context of hydroxylation of prolines. The previous molecular mechanics parameters for hydroxyproline, however, do not reproduce the correct pucker preference. We have developed a new set of parameters that reproduces th…
Four-leg oxide thermoelectric modules consisting of two pairs of p type Ca 3 Co 4 O 9 and n type Ca 0.95 Sm 0.05 MnO 3 bulks of 4 × 4 mm 2 cross-section and 5 and 10 mm heights were constructed and their performance discussed. The modules were assembled using silver paste wherein the thermoelectric elements are electr…
Abstract We are proposing a novel method to prepare chitosan/montmorillonite nanocomposites. The montmorillonite (MMT) clay was excavated from the mountainside of eastern Taiwan. After being purified, it was incorporated with potassium persulfate (KPS) through the intercalation process. As the KPS‐incorporated MMT was…
The effect of isotacticity on the mesomorphic phase-forming properties of isotactic polypropylene (iPP) is reported. Only iPP having high isotacticity (iPP-HT) can form the mesomorphic phase by a rapid quench, but iPP having low isotacticity (iPP-LT) cannot form the mesomorphic phase though it crystallizes by the same…
The thermolytic molecular precursor method was used to introduce site-isolated Ti(IV) centers onto the surface of a mesoporous SBA15 support. The resulting surface Si-OH/Ti-OH sites of the Ti-SBA15 catalysts were modified with a series of (N,N-dimethylamino)trialkylsilanes, Me(2)N-SiMe(2)(R) (where R = Me, (n)Bu, or (…
Abstract The integral methods are extensively used for the kinetic analysis of solid‐state reactions. As the Arrhenius integral function [ p ( x )] does not have an exact analytical solution, different approximated equations have been proposed in the literature for performing the kinetic analysis of experimental integ…
A novel and facile synthesis route to large-pore mesoporous nanocrystalline anatase thin films with tunable pore diameters in narrow distribution of sizes ranging from 8.3 to 14 nm is reported, using triblock copolymer as the template and Ti(OBu(n))4 as the inorganic precursor. The obtained materials were characterize…
Morphology-controllable synthesis of various pyrene nanostructures from nanoparticles to short nanorods and nanowires (long nanorods) was achieved by a simple self-assembly method. In this approach, aqueous sodium dodecyl sulfate (SDS) micelles were used as templates to direct the self-assembly of the pyrene molecules…