Materials Literature
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充てん剤系ゴムは単に充てん剤がゴムマトリックス中に分散した系ではなく, 複雑な高次構造を形成する. 本研究は充てん剤系ゴムの高次構造の各構造単位の形態, 分子運動性とマクロ的なゴムの力学的特性との間の関連性を, NR～ISAF, CaCO3, SiO2の各充てん剤系未加硫ゴムについて, NMR, 力学分散, DSCなどによるゴム分子鎖の運動面から検討した. その結果充てん剤の表面活性, その分散状態により充てん剤表面から離れた部分 (A相) のゴム分子鎖の運動は, それが活発に運動する状態では束縛を受けるが, この束縛された運動を見かけ上の非運動性のゴムの容積に変換することにより, E′, tanδの力学的数値をNMRより観測した…
A study of the photochemical reactions of some βγ-unsaturated and γδ-unsaturated 1,2-diketones is reported; it is concluded that the only efficient primary intramolecular processes involve the carbonyl group furthest removed from the alkyl chain, which may undergo cycloaddition via a five-membered transition state to…
Abstract : Hot pressed diboride compositions of ZrB2 or HfB2 with additions of SiC and/or C were employed to produce materials with a range of compositions and microstructural variations of porosity and grain size for mechanical property evaluations which included ben strength and elastic modulus from room temperature…
The Specific Rotation of Sorbitol and of the Sorbitol Molybdate Complex. The specific rotation of the hexite at 365, 405, 436, 546 and 578 nm has been determined in solutions of different concentration with a commercial sorbitol preparation as well as with a self‐produced sorbitol. Contents of both preparations had be…
Uniaxial fatigue properties from tests at 400, 500, 600, and 700 C on Type 304, 304L (Ti modified), and 316 stainless steel specimens irradiated at 450 C in sodium and 750 C in argon at fluences of 0.03 to 9.3×1021 n/cm2, E>0.1 MeV, are given and compared with control specimens. Material was tested in the annea…
Abstract
The standard enthalpy of formation of aluminium chloride has been measured by reacting aluminium with chlorine gas in the presence of an excess of liquid chlorine in a glass combustion vessel inside a calorimeter at 298 K. Complete reaction was achieved. The heat of evaporating part of the chlorine into the previously…
Abstract. Sable N, Gaikwad S, Bonde S, Gade A, Rai M. 2012. Phytofabrication of silver nanoparticles by using aquatic plant Hydrilla verticillata. Nusantara Bioscience 4: 45-49. In the context of current drive to developed new green technology in nanomaterials, synthesis of nanoparticles is of considerable importance.…
Abstract The precipitation of proteins with heteropolyacids has been studied for the purpose of large scale primary purification. A precipitate will form if the pH of the reaction between purified ovalbumin, hemoglobin, trypsin, pepsin, bovine serum albumin, ovomucoid, gelatin or ribonuclease and tungstrophosphoric, t…
The inhibition of the thermal reaction between hydrogen and oxygen by hydrogen bromide has been studied over a wide range of mixture composition and vessel diameter at 500°C using vessels coated with boric acid. Under these conditions, surface reactions are unimportant and the inhibition arises through the sequence of…
Chrome tanning is a versatile tanning system, but the pollution problems of chromium due to inadequacy of treatment systems and possible formation of Cr(VI), a carcinogen, have led to search for an ecofriendly and viable alternative tanning system. The present investigation focuses on the development of a novel, high…
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The formation of oil/water (O/W) nano-emulsions suitable for cosmeceutical application was studied. Nano-emulsions were prepared by using phase inversion composition (PIC) method, one of the low-energy emulsification methods. The process consist of stepwise water addition to oil/surfactant mixture, at T = 25°C. Capryl…
Effects of low pressure radio frequency (rf) plasma treatment on the surface properties of polycarbonate are presented in this paper. Results obtained from the surface energy measurement after different conditions of treatment are compared. After treatment the surface free energy increased from the original value of 3…
Transition-metal oxides can be insulators, semiconductors, metals, or undergo semiconductor-metal transitions. The nonmetallic materials are characterized by a primarily localized optical spectrum but a band-like electrical conductivity. However, a pure band approach predicts metallic rather than nonmetallic behavior,…
It is shown that in organic molecular crystals the fluctuations of the intermolecular electron jump frequencies resulting from the lattice vibrations may produce a considerable increase of the total electric current. An expression for the current density operator, which takes into account the electron-phonon interacti…
Nanotechnology offers a vision for a ‘smart’ drug approach involving the design, synthesis, and characterization of materials and devices that have a functional association in nanometer scale. One area in which nanotechnology may have a significant clinical impact in neuroscience is the selective transport and deliver…
Polycrystalline NiFe2O4 was prepared by solid state reaction from nano size powder of NiO and Fe2O3 which were synthesized by wet chemical method. The inverse spinel single phase of the sample has been confirmed by the X-ray diffraction patterns. SEM micrographs of the samples revealed that the grain size increases an…
The dissolution into water of barium sulphate labelled with 35S has been studied from 10.5 to 35°C. The kinetics proved to be second order to at least 85 % saturation, the activation energy being 24.7 ± 0.8kJ mol–1. Diffusion control of the dissolution process was not observed.
The work of adhesion, depending solely on the contact angle and surface tension, is unreliable as a guide to the strength of a joint. The kinetics of joint formation, exemplified by the rate of wetting, is also important and can be measured by rate of change of contact angle, a process for which an empirical equation…