Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Crystal polymorphism is important because of the different physical and mechanical properties of the polymorphs. Based on a stereochemical approach to controlling crystal polymorphism using stereospecific nucleation inhibitors, auxiliaries have been designed for the precipitation of the yform of glycine (see Figure) f…
Both liquid and solid foams, together with analogous cellular materials, have distinctive mechanical or rheological properties which find many applications. This review concentrates on the search for a basic understanding of the underlying mechanisms, in terms of specific structural models. Computer simulations play a…
The crystal structures of three calcium chalcogenides CaS, CaSe, and CaTe were investigated by energy-dispersive x-ray-diffraction techniques using a synchrotron source to a static compression up to 52 GPa. For CaS and CaSe, a first-order phase transformation from the NaCl phase to the CsCl phase was observed at 40 an…
Highly transparent and conductive zinc-stannate thin films, ZnSnO 3 , have been prepared by rf magnetron sputtering using a target composed of ZnO–SnO 2 ( SnO 2 , 78 wt%). A resistivity as low as 4×10 -3 Ω·cm and an average transmittance above 80% in the visible range were obtained for undoped zinc-stannate films depo…
The molecular weight of polyaniline can be substantially increased from that normally obtained (Mw ≈ 53 000) by the oxidative polymerization of aniline with ammonium peroxydisulfate at about 0 to 3 °C up to about 218 000 by the presence of selected dissolved neutral salts. A further increase up to Mw ≈ 385 000 can be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization and Solid-State Properties of Processable N-Alkylated Polyanilines in the Neutral StateWen-Yue Zheng, Kalle Levon, Jukka Laakso, and Jan-Eric OesterholmCite this: Macromolecules 1994, 27, 26, 7754–7768Publication Date (Print):December 1, 1994Publication Hist…
Chemical characterization of passive films formed on AISI 304 austenitic stainless steel, in a borate/boric acid solution at pH 9.2, under various conditions of potential, temperature, and polarization time, was made by Auger electron spectroscopy combined with ion sputtering, and x‐ray photoelectron spectroscopy (XPS…
Monte Carlo simulations show that dense systems of spherical particles with a short-ranged attractive interaction can undego a first-order transition from a dense to a more expanded solid phase with the same structure. This phase transition is analogous to the liquid-vapor transition in systems with longer-ranged attr…
The preparation of electrochromic nickel oxide ( NiO x ) films, which are colorless in an as-deposited state, has been carried out in Ar/O 2 /H 2 mixed gas by the rf-sputtering method. Highly transparent films of as-deposited nickel oxide could be prepared in the sputtering atmosphere consisting of Ar:O 2 :H 2 =50:10:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular hyperpolarizabilities of coumarin dyesChristopher R. MoylanCite this: J. Phys. Chem. 1994, 98, 51, 13513–13516Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/j1…
A theory has been developed to examine the depolarization effect on the ferroelectric transition of small ${\mathrm{BaTiO}}_{3}$ particles. To reduce the depolarization energy, a crystal would break up into domains of different polarization. In this study, we consider cubic particles with alternating domains separated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBlock Copolymer "Crew-Cut" Micelles in WaterZhisheng Gao, Sunil K. Varshney, Stanislaus Wong, and Adi EisenbergCite this: Macromolecules 1994, 27, 26, 7923–7927Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December…
Abstract Porphyrin‐C 60 dyads in which the two chromophores are linked by a bicyclic bridge have been synthesized using the Diels‐Alder reaction. The porphyin singlet lifetimes of both the zinc (Pz n ‐C 60 ) and free base (P‐C 60 ) dyads, determined by time‐resolved fluorescence measurements, are ≦17 ps in toluene. Th…
Electron-beam-induced deposition of materials has been known for almost 40 years from contamination writing. It has developed into “additive lithography” with nanometer resolution employed in scanning electron microscopes, in dedicated lithography systems, in reducing image projection systems, and in scanning tunnelin…
The chemical inertness and corrosion resistance of a boron‐doped diamond thin film electrode, grown by chemical vapor deposition (CVD), have been studied during potential cycling (PC) for 2 h in a solution of at 50°C. Similar experiments were performed on highly ordered pyrolytic graphite (HOPG) and glassy carbon (GC)…
A myosin phosphatase was purified from chicken gizzard smooth muscle. The holoenzyme is a trimer and consists of 130,000-, 38,000-, and 20,000-Da subunits (in agreement with the results of Alessi et al.: Alessi, D., MacDougall, L. K., Sola, M. M., Ikebe, M., and Cohen, P. (1992) Eur. J. Biochem. 210, 1023-1035). The c…
The influence of chemical admixtures (superplasticizer-retarder) and active silica minerals (fraction less than 45 μm) in cement hydration, mechanical strength increase and variations of the physical properties of light weight mortars with partially zeolitized Cuban tuffs is evaluated.
Hydroxyapatite Ca5(PO4)3OH (HAp) is a crystalline phase which has several applications within the domain of special cements. This phase takes an important role in the cement reactions for the reconstruction of skeletal functions (medical domain). It is used also to improve properties of dental material. On the other h…
The use of low-emittance coating (low-E) glasses in Europe and the United States is not recent (they make use of them long since: 10-15years), nevertheless they are almost unknown in Spain, in all respects, in spite of being commercialized long since by different houses, specialists in these matters. We run into a lac…