Materials Literature
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Differential scanning calorimetry (DSC) and dynamic and thermomechanical analyses are used to study the glass transition temperature (Tg) of the thermotropic liquid crystalline polyesters prepared by molten polycondensation of 4-acetoxyvanillic acid (V), 4-acetoxybenzoic acid (B), and poly(ethylene terephthalate) (E).…
Several samples of poly(lactic acid) with different molecular weights and tacticity have been prepared, and some PLLA injection moulded specimens have been annealed to promote their crystallization. From the characterization data, poly(L-lactide) showed more interesting mechanical properties than poly(D, L-lactide), a…
The electrochemistry and spectroscopic properties of three iron corroles were examined in benzonitrile, dichloromethane, and pyridine containing 0.1 M tetra-n-butylammonium perchlorate or tetra-n-ethylammonium hexafluorophosphate as supporting electrolyte. The investigated compounds are represented as (OEC)Fe(IV)(C(6)…
Several samples of poly(lactic acid) with different molecular weights and tacticity have been prepared, and some PLLA injection moulded specimens have been annealed to promote their crystallization. From the characterization data, poly(L-lactide) showed more interesting mechanical properties than poly(D, L-lactide), a…
We present a method to perform fully selfconsistent density-functional calculations, which scales linearly with the system size and which is well suited for very large systems. It uses strictly localized pseudoatomic orbitals as basis functions. The sparse Hamiltonian and overlap matrices are calculated with an $O(N)$…
The effect of ionizing radiation on nanoparticles can change the chemical and physical properties of materials. The study of these processes by means of Fourier infrared spectroscopy leads to a better understanding of the behavior of nanomaterials in the radiation environment and the development of new fields of appli…
The phenomenon of reaction anisotropy, i.e. forming of different products on different crystals' facets, is characteristic for 2-amino-5-aryl- 1,3,4-oxadiazoles solid-state acetylation. In this case, the ratio of products in reaction yield depends on the form of substrate crystal, hence, on the solvent from which the…
An intermediate heat exchanger (IHX) for the High Temperature Engineering Test Reactor (HTTR) is an important component of the cooling system and it is important to confirm the structural integrity. Particularly, a connecting tube would be subjected to thermal stress caused by the difference of thermal expansion and t…
金属イオンとポルフィリンが水溶液中で錯形成する際,錯体形成前に両化学種間の会合体が存在していることを疎水性樹脂(Amberlite XAD-2)カラムを用いて確認した.金属イオン溶液の連続的な流れの中にポルフィリン溶液を注入すると,ポルフィリンはインジェクターの下流に設けたXADカラムに吸着する.その際会合及び錯形成した分の金属イオンも伴われて吸着し,その分金属イオン濃度が一時的に減少する.この減少分から算出すると,Cu2+及びZn2+とα,β,γ,δ-tetrakis(4-N-methylpyridyl)porphine(TMPyP)との会合定数は,それぞれ32(10℃)及び57(25℃)M-1蓋であった.ポルフィリンの金属錯体…
In order to achieve an effective standard for the testing of composite insulators such as those currently available for porcelain and glass materials, it is proposed that the performance of the composite insulator under a variety of natural conditions should be studied with equal emphasis alongside some existing stand…
As part of a broader study of liquid crystal polymers with side groups containing fluorene moieties, more information was required about the properties of fluorene derivatives. With this aim in mind, the solution Kerr-effects for five fluorene-based mesogens have been measured and used in conjunction with other result…
Abstract BaCu(C 2 O 4 2 .6 H 2 O is triclinic, P 1 , with a = 6.5405(9), b = 9.202(3), c = 10.939(1) Å, α = 85.46(2), β = 79.22(1), γ = 80.45(2), V = 636.99(1) Å 3 , Z = 2, D 0 = 2.14, D c = 2.465 g. cm −3 , R = 0.074, wR = 0.0746 for 2219 significant reflections | F 0 |≧ 6.0σF 0 . The barium has eleven coordinations…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionEnzymatic Degradation of Bacterial Poly(3-hydroxybutyrate) by a Depolymerase from Pseudomonas lemoigneiGianpaolo Tomasi, Mariastella Scandola, Bernd Holger Briese, and Dieter JendrossekCite this: Macromolecules 1996, 29, 14, 5056Publication Date (Web):July 1, 1996Pub…
The formation process of perovskite solid-solution 0.9Pb(Mg1/3Nb2/3)-0.1PbTiO3 (0.9PMN-0.1PT) from a stoichiometric mixture of PbO, Nb2O5, TiO2 and Mg(OH)2 by a soft-mechanochemical technique was studied. Single phase of perovskite 0.9PMN-0.1PT powder was obtained after heating at 850°C for 4 h of the mechanically act…
A study of the flocculation of pure goethite, quartz and kaolinite with cassava starch in the presence of Na2Si03 and KF has been undertaken. The results show that goethite is fully dispersed in a goethite-quartz mixture under these conditions and that optimum flocculation of goethite occurs at pH 7.5 with 50 ppm cass…
A survey is made of years long investigations performed by the author and his coworkers on the structure of sodium metaphosphate glass, the melt and the crystalline forms of this substance, on its thermodynamic properties and crystallization. Sodium metaphosphate (or Graham's) glass, (NaPO3)x, is a typical representat…
The alloy Mn‐Al‐C (magnetic τ‐phase) has a face‐centered tetragonal lattice with the superstructure L 1 0 (Shangurov, Gornostyrev, Teitel et al ., 1990). The tetragonal crystal axes c (the directions of the easy magnetization) of the grain lattices of the polycrystal permanent magnet must be preferably oriented along…
An investigation was carried out to determine the aqueous corrosion performance of the Metco 15F commercial Ni-Fe-Cr-B-Si-C alloy coating. Such coatings are frequently used in engineering applications where a combination of high wear and high corrosion resistance is required. Accordingly, the coating has sometimes bee…
オゾン破壊物質である CFCs (クロロフルオロカーボン類)の分解処理技術の開発が急務となっている。触媒を用いた分解プロセスは,高活性,高寿命の触媒が見いだせれば,他の方法に比べ低い温度で処理することができるため,実用的なプロセスとなりうる。そこで,本研究では CFC113(C2Cl3F3)を用いて水蒸気による分解触媒の探索を行った。その結果, TiO2 触媒が高活性を示した。しかし,反応時間わずか 2 時間で活性低下が見られた。TiO2 に他の酸化物(WO3,zrO2,Nb2O5)を添加すると,WO3を混合した TiO2-WO3 触媒が高活性を維持した。TiO2系触媒の酸強度分布測定の結果,TiO2-W03触媒は TiO2 単独…
By using a needle-plane electrode system, electrical treeing discharges were measured with a computer-aided partial-discharge measurement system. It was found that time derivative of applied voltage (dv/dt) plays an important role in determining the occurrence of partial discharge (PD), while PD intensity is strongly…