Materials Literature
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A stress analysis was carried out in order to determine the local stress distribution around spherical particles in particulate filled composites. The results were introduced into the criteria for micromechanical deformations and the conditions for the initiation of each mechanism were calculated. Results of the calcu…
A 1 : 1 mixture of 5-hexadecyl-2,4,6-triaminopyrimidine and 5,5-didodecylbarbituric acid can cause physical gelation in organic liquids; the gel phenomenon is investigated by FTIR spectroscopy, TEM (transmission electron microscopy) and X-ray diffraction.
Extremely thin graphite filaments with a tubular structure were grown in carbon deposits formed on the negative electrode during generation of fullerenes by dc carbon-arc-discharge evaporation. The filaments and small graphite particles coexist in the central portion of the deposits. Three kinds of morphologies of car…
X-ray photoelectron spectroscopy (XPS) has been used to study the chemical effects of both inert (argon) and reactive (oxygen, nitrogen, and mixed gas) plasma treatments done in situ on a variety of polymer surfaces. Inert gas plasma treatments introduce no new detectable chemical species onto the polymer surface but…
Partial compressibilities of globular proteins in water are reviewed. Contribution of hydrational and of intrinsic compressibilities to experimental partial quantity have been evaluated from ultrasonic data using two independent methods: (a) additive calculation of the hydrational contributions of the surface atomic g…
It is shown experimentally that the complete replacement of benzene rings with thiophene rings in a donor–acceptor substituted stilbene significantly enhances its second-order nonlinear optical hyperpolarizability (β); results obtained with a series of thiophene-substituted donor–acceptor compounds with different conj…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDendritic analogs of engineering plastics: A general one-step synthesis of dendritic polyaryl ethersTimothy M. Miller, Thomas X. Neenan, Elizabeth W. Kwock, and Susan M. SteinCite this: J. Am. Chem. Soc. 1993, 115, 1, 356–357Publication Date (Print):January 1, 1993Publicatio…
The taper-shaped monoesters of mono-3a, di-3c, tri-3d, and tetra-3f ethylene glycol with 3,4,5-tris(p-dodecyloxybenzyloxy)benzoic acid 1 and their corresponding polymethacrylates, 6a, b, c and d, respectively, self-assemble into a tubular supramolecular architecture displaying an enantiotropic columnar hexagonal (Φh)…
ABSTRACT Edible films from corn zein, wheat gluten, and wheat gluten/soy protein isolate (2.1:0.9) were produced and their oxygen permeabilities were determined at 7, 15, 25, and 35°C under 0% relative humidity. Mean oxygen permeability values for the 3 films were in the range of 1.8–11.2, 0.9–6.1, and 0.6–3.8 amol/m.…
A history of polymeric insulators is given, beginning in the 1940s when organic insulating materials were used to manufacture high-voltage indoor electrical insulators from epoxy resins. Their advantages and early experiences with them are given. A bibliography covering mainly 1970 to the present is given.>
Status and perspectives of controlled thermonuclear fusion - a European view (H. Bruhns). Role of atomic and plasma-material interaction physics in controlled fusion research and development (R.K. Janev). Atomic physics aspects of controlled thermonuclear fusion (H.W. Drawin). Atomic and molecular data exploitation fo…
The structure and interparticle interactions in colloidal dispersions of montmorillonite and Laponite RD (a model hectorite-type clay) have been investigated by small-angle neutron scattering (SANS). Measurements have been made under static conditions and during shear, using a Couette-type cell, for concentrations in…
Abstract Recent patents in the starch‐based plastics area have claimed melted or “destructurized” starch as a new type of material. The term “destructurized starch” has apparently been coined after the physically modified state of starch obtained by the disruption of the granular state, resulting in the loss of order…
The redox couple 1/2represents an electro-photoswitching device displaying electrochemically reversible interconversion between a non-luminescent state 1 and a luminescent state2.
The fibre-matrix (FM) interfacial zone plays a key role in the mechanical behaviour of Si-C(O)/SiC inverse composites fabricated by chemical vapour infiltration (CVI) from ex-polycarbosilane Si-C(O) fibres precoated with pyrocarbon or boron nitride. It consists not only of the C (or BN) main interphase, but also of ve…
Progress in the field of discotic liquid crystals is summarized, with emphasis on experimental results rather than theoretical developments. Examples are given of discotic mesogens (including metallo-mesogens) and discotic polymers, and the structures of the mesophases identified to date are described.
Sinterable cordierite glass-ceramics developed for use in fabricating copper-glass-ceramic multilayer substrates have been studied to understand the important role of the composition in sintering, crystallization, and microstructural development
This symposium was held February 22--24, 1993 in Denver, Colorado as part of the 1993 Annual TMS Meeting. The purpose of this symposium was to provide a forum for exchange of state-of-the-art information on titanium alloys. Attention is focused on the following: alloy development; environmental aspects; microstructure…
A general scheme for the improvement of electron-density maps is described which combines information from real and reciprocal space. The use of Sayre's equation, solvent flattening and histogram matching within this scheme has been described previously [Main (1990). Acta Cryst. A46, 372-377]. Non-crystallographic sym…
Thermal oxidizing treatments of hydrogenated diamond surfaces have been performed in an O2 environment. Chemisorption of oxygen on diamond surfaces has been investigated by diffuse reflectance Fourier-transform infrared (FTIR), temperature-programmed desorption (TPD), temperature-programmed reaction (TPR) and thermogr…