Materials Literature
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A two-dimensional simulation was employed to study the melt/air and melt/solid interface shapes of the miniature molten zone formed in a laser-heated pedestal growth (LHPG) system. Using a non-orthogonal body-fitting grid system with the control-volume finite-difference method, the interface shape can be determined bo…
Abstract The normal Raman and surface‐enhanced Raman scattering (SERS) spectra of flavanthrone and indanthrone were obtained at several excitation wavelengths. The spectral assignments were aided by density functional calculations. Since both molecules have very high symmetry ( C 2 h ) including a center of inversion,…
Abstract The higher surface area of selectively grown multiwall carbon nanotubes (MWCNTs) and the better proximity of the reactant species in in situ microemulsion polymerization were used to attach the polystyrene (PS) nanoparticles to the outer wall of MWCNTs. Attachment were achieved by replacing surfactant with PS…
In this paper, amine-modified silica nanoparticles (NPs) with diameters (d) from 15 to 230 nm are covalently linked to poly(styrene-random-acrylic acid) (P(S-ran-AA)) films, and wettability is studied as a function of diameter and NP surface coverage. During attachment, films swell and exhibit long and short scale rou…
Transverse sound velocity of cross-linked tetragonal hen egg-white (HEW) lysozyme crystals containing large amount of water in the crystal was measured using ultrasonic pulse-echo method. All elastic constants of cross-linked crystals were observed to be ${C}_{11}={C}_{22}=5.50\text{ }\text{GPa}$, ${C}_{12}=4.33\text{…
Carbon monoliths with well-defined macropores and high surface areas were prepared by carbonization of macroporous poly(divinylbenzene) (PDVB) monoliths. The carbonization reactions of PDVB networks are studied by thermal analysis and FT-IR measurements. According to the measurement results, the PDVB networks are most…
This Letter examines the relation between the spin-wave instabilities of collinear magnetic phases and the resulting noncollinear phases for a geometrically frustrated triangular-lattice antiferromagnet in the high-spin limit. Using a combination of phenomenological and Monte Carlo techniques, we demonstrate that the…
Abstract Star‐shaped PbWO 4 crystals have been synthesized in large scale by a hydrothermal route. The influence of reaction time and temperature is studied. It is observed that the luminescence intensity of the same sample increases dramatically with decreasing the temperature, the Luminescence intensity of the diffe…
The guest-host interactions of poly(amidoamine) (PAMAM) dendrimers and porous silica surfaces were investigated by near-infrared (NIR) diffuse reflection spectroscopy. G0-G7 of amine-terminated PAMAM (PAMAM-NH2) dendrimers were analyzed comprising early, mid, and late generations. For early stages, the adsorption proc…
Elastic memory composite (EMC) can endure a much higher nominal bending strain than the ultimate strain of reinforced fibers. Experimental studies have confirmed that microbuckling and post-microbuckling response for compressively loaded fibers in the soft matrix are the primary deformation mechanism for EMC to realiz…
A seeded process based on the staged addition of sodium borohydride and hydroquinone (HQ) to silver nitrate was used to form aqueous nanocolloids consisting of tabular triangular structures. The unique selectivity of HQ as a reducing agent was used to look at the factors that affect the formation of these triangular n…
Pressure-induced changes in ferromagnetic transition temperature $({T}_{C})$, saturation magnetization $({M}_{S})$, remanent magnetization $({M}_{R})$, and coercive field $({H}_{C})$ as well as the changes in the lattice parameters were investigated for both stoichiometric and oxygen-deficient ${\text{La}}_{1\ensurema…
The synthesis and characterization of a series of Ge,Al-ZSM-5 samples made in hydroxide media is reported. X-ray fluorescence (XRF) and X-ray photoelectron spectroscopy (XPS) indicate there is a germanium-rich overlayer on these crystals. Electron microscopy results validate this conclusion, and also indicate that the…
It is shown that 21 ABX(3) perovskites with tilted BX(6) octahedra and layered ordering of A cations can be generated on the basis of group-subgroup relations. These structures (with 16 different space groups) are classified into ten diffraction types in terms of the conditions for superstructure reflections caused by…
Self-assembling of synthesized novel biodegradable hyperbranched amphiphilic poly(ethylene glycol)-polyethylenimine-poly(epsilon-benzyloxycarbonyl-l-lysine) (PEG-PEI-PLys(Z)) in aqueous media is studied. In aqueous media, PLys(Z) is the hydrophobic segment, with PEG and PEI as the hydrophilic segments. It will self-as…
Optically active poly(diphenylacetylene) derivatives, poly(4-(( S )-2-methoxyoctyloxy)diphenylacetylene) ( poly-1 ), poly(4-(( S )-2-triethylsiloxyoctyloxy)diphenylacetylene) ( poly - 2 ), and poly(4-(( S )-2-hydoxyoctyloxy)diphenylacetylene) ( poly - 3 ), were successfully synthesized and were examined about their ch…
Normal pressure modifications and tentative high-pressure phases of the nitridosilicates MSiN(2) with M = Be, Mg, or Ca have been thoroughly studied by density functional methods. At ambient pressure, BeSiN(2) and MgSiN(2) exhibit an ordered wurtzite variant derived from idealized filled β-cristobalite by a C1-type di…
Purpose In this paper, the contribution of dynamic loading, needle and fabric, and the bobbin thread interaction on the changes in the tensile properties of the needle thread are to be investigated. Design/methodology/approach Tensile properties of the needle thread have been studied at four sewing stages, namely befo…
The present study describes experiments carried out to analyze the effects of superficial treatment on the thermal performance of needlepunched nonwoven sisal fiber used as thermal insulation material. Nonwovens with gramature 1300–1400 g/m2 “in natura” and treated (2% w/w sodium hydroxide) were used to the thermal in…
We report measurements of the excitation energy dependence of the fluorescence intermittency of single CdSe/ZnS core/shell nanocrystals (NCs), using two different sizes of NCs and three different excitation energies. The lowest excitation energy corresponds to exciting the smaller size NC at its optical band gap, so w…