Materials Literature
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Physical and chemical changes may often be induced by raising or lowering the temperature of a substance. Typical examples are phase transitions, such as fusion, or chemical reactions, such as the solid state polymerization of sodium chloroacetate, which has an onset at 471 K: ClCH2COONa (cr) ⇋ NaCl (cr) + 1/n − (CH2C…
Polarized neutron reflectometry (PNR) provides evidence that nonlocal electrodynamics governs the magnetic field penetration in a low-$\ensuremath{\kappa}$ superconductor. The sample is an In film with a large elastic mean-free path. It is shown that PNR can resolve the difference between the reflected neutron spin as…
The authors consider the analysis and modelling of the scattering from frequency-selective surfaces (FSSs), in the 6–14 GHz band, as a function of its periodic array geometry of thin dipole elements on an anisotropic layer. The accurate full-wave electromagnetic (EM) analysis of each FSS was carried out using the meth…
Abstract Aniline‐formaldehyde condensate (AFC) is an amine functional group containing polymer. The sticky resinous nature of the polymer limits its usefulness. Synthesis of AFC in presence of methanol, isopropanol, t‐butanol, n‐octanol or glycerine formed solid cakes instead of resinous material. The scanning electro…
This work investigated the effect of Yb2O3 addition on densification, phase composition, microstructure and flexural strength of ZrB2-SiC ceramics via hot pressing. Results showed that the addition of Yb2O3 eliminated the pores located at triple points and improved densification. With the introduction of 3 vol%Yb2O3,…
Abstract The preparation of new charge‐transfer (CT) salts based on the decamethylmetallocenium donors (D), [M(Cp*)2] (M = Mn, Cr), and on the bis[bis(trifluoromethyl)ethylene diselenolato]metalate(III) acceptors (A), [M′(tds)2] (M = Ni, Pt), yielded four new members of the family of CT salts [M(Cp*)2][M′(tds)2] {M/M′…
Abstract High molecular weight poly(9,10‐bis(p‐(2‐ethylhexyloxy)phenyl)‐2,6‐anthracenevinylene) (2,6‐PAV) was synthesized with 2,6‐dimethylanthraquinone as a key intermediate. The as‐synthesized polymer is readily soluble in common organic solvents and can be used for spin‐coating. The as‐synthesized polymer exhibits…
Nanocrystals of La 1- x Sr x MnO 3+δ (0< x ≤0.51) with a diameter of about 8 nm were synthesized in the pores of the mesoporous silica SBA-15. The crystal structure at all Sr concentrations had a rhombohedral symmetry. The temperature dependence of the magnetization showed ferromagnetic and superparamagnetic behavior,…
Motivated by recent studies on the quasi-one-dimensional (1D) antiferromagnet BaCo2V2O8, we investigate the Tomonaga-Luttinger-liquid properties of the 1D S=1/2 XXZ Heisenberg-Ising model in magnetic fields. By using the Bethe ansatz solution, thermodynamic quantities and the divergence exponent of the NMR relaxation…
The scientific community paid little attention to a visionary paper, in which Szent-Györgyi predicted that crystalline interfacial water layers would play a fundamental role in biology and evolution. It was 1971, and the proof of the existence of crystalline interfacial water layers at room temperature was virtually l…
Abstract ZnS microspheres have been synthesized in large scale by a hydrothermal route. The influence of reaction time on the phase constitution is studied. The evolution process from cubic phase to hexagonal phase is showed with prolonging reaction time. It is observed that the luminescence intensity of the same samp…
Abstract An exploration of the cobalt‐tartrate system under hydrothermal conditions, has led to the isolation of crystalline framework {Co2(H2tar)2]·2H2O}n (1) (H2tar = tartrate dianion). Single‐crystal X‐ray analyses reveal that it crystallizes in the orthorhombic space group P21212. a = 11.0924(11) Å, b = 7.8517(8)…
Abstract Biphenol monoacrylate (AL) was combined with a traditional hindered phenolic‐based binary antioxidant system to form a ternary stabilization system for the purpose of further improving the thermal–oxidative stability of polyamide 6 (PA6). The thermal stabilization effect of the antioxidant AL on PA6 was studi…
The structure of transmission blazed binary gratings for optical limiting is designed with the form-birefringence theory. This kind of grating has subwavelength features, can imitate the transmission blazed grating effectively, and has higher efficiencies than a transmission blazed grating with a subwavelength structu…
Abstract One of the major disadvantages of ultrahigh modulus polyethylene (UHMPE) fibers is their low surface energy which makes them difficult to adhere to most of the resins used in composites. Therefore, UHMPE fibers are often treated with plasmas to improve their surface properties. However, aging of plasma treatm…
Single crystal synchrotron x-ray diffraction study has been performed on the layered perovskites $R{\text{BaCo}}_{2}{\text{O}}_{\ensuremath{\sim}5.5}$ $(R=\text{Tb},\text{Nd})$ over a wide temperature range $100<T<375\text{ }\text{K}$. By means of reciprocal space mapping and symmetry analysis, it is shown that the fi…
Abstract In this work, the influence of curing temperature on microstructures of isobutylene–isoprene rubber/clay nanocomposites (IIRCNs) prepared by melt compounding was characterized using wide‐angle X‐ray diffraction and TEM. The gas barrier and tensile properties of IIRCN cured under different temperature were exa…
Abstract Polyhydroxybutyrate (PHB) is a biodegradable bacterial polyester emerging as a viable substitute for synthetic, semicrystalline, nonbiodegradable polymers. An elastomer terpolymer of acrylonitrile‐g‐(ethylene‐co‐propylene‐co‐diene)‐g‐styrene (AES) was blended with PHB in a batch mixer and in a twin‐screw extr…
Nanopowder of a new tin(II) titanium(IV) oxide hydroxide fluoride, Sn 1.24 Ti 1.94 O 3.66 (OH) 1.50 F 1.42, with the pyrochlore-type structure (cubic a = 10.3777(7) Å, space group Fd 3̅ m ) was prepared at 180 °C and pH 2 by using a microwave assisted solvothermal reaction. The grain size of the nanopowder was 20−30 n…
Mathematical modeling to analyze the vibration problem of a Terfenol-D actuator is presented, using Hamilton's variational principle. The total kinetic, strain and magnetic energy stored in the rod is expressed as a function of the displacement. The material constitutive relation of the magnetostrictive rod is assumed…