Materials Literature
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We consider a semi-flexible chain adsorbed on a wall by a constant external field, h , or a short-range surface potential, V s . When the amplitude of h or V is decreased the system undergoes an unbinding transition; the properties of such transitions are studied here through various analytical and numerical methods (…
Using a new experimental technique, we have measured the fourth moment of the current distribution in two-dimensional random resistor networks. The fourth moment is proportional to relative resistance fluctuations in a network of noisy resistors, and, until now, noise measurements provided the only experimental probe…
Abstract Synchrotron x‐radiation has been used to follow the development of low‐angle diffraction in sharp fractions of polyethylene. The polymer is shown to crystallize in very thin lamellae which rapidly thicken in a single step to twice, three times, or four times the original thickness. This dramatic refolding is…
An in situ study of prismatic glide in beryllium is made to provide a simple model for understanding the anomalous increase in elastic limit as a function of temperature. This effect is also observed in several ordered alloys such as superalloys. In this paper, Part I, the mechanism controlling the deformation is stud…
A glucose dehydrogenase gene was isolated from Bacillus megaterium IWG3, and its nucleotide sequence was identified. The amino acid sequence of the enzyme deduced from the nucleotide sequence is very similar to the protein sequence of the enzyme from B. megaterium M1286 reported by Jany et al. (Jany, K.-D., Ulmer, W.,…
Abstract The surface of low density polyethylene has been grafted with glycidyl acrylate and glycidyl methacrylate by photoinitiation. ESCA measurements on the grafted surface showed a 72% coverage for glycidyl acrylate and 52% for glycidyl methacrylate after 10 min of grafting with UV irradiation. ATR–IR showed a 10…
The effect of annealing on the wetting behavior of Bi‐rich intergranular phases in ZnO:Bi:Co varistors was studied. The intergranular phase exhibits temperature‐dependent grain‐boundary wetting, with an average equilibrium dihedral angle of 0° at 1140°C and over 55° at 610°C. The temperature‐dependent wetting may be r…
Abstract Organic conjugated polymers and oligomers constitute a three‐dimensional network of molecular wires, in which all monomeric units can be functionalized with various prosthetic groups. By varying the nature of these groups, specific interactions with external physical or chemical phenomena can be developed in…
The relaxation kinetics and size of the third-order nonlinear susceptibility χ(3) of a homologous series of polycondensed thiophene-based polymers and polysilane polymers were determined by ultrafast nonlinear laser techniques. The wavelength dependence over 530–1060 nm of χ(3) was measured for polycondensed thiophene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric monolayer dynamics at the air/water interface by surface light scatteringMasami Kawaguchi, Bryan B. Sauer, and Hyuk YuCite this: Macromolecules 1989, 22, 4, 1735–1743Publication Date (Print):April 1, 1989Publication History Published online1 May 2002Published iniss…
Two types of diamagnetic luminescence centers were found in VAD SiO 2 glass sintered under reducing atmospheres. One of the PL centers, which had an excitation band at 5.17 eV (240 nm) and two emission bands, at 4.2 eV (295 nm) and 3.1 eV (400 nm), was mainly detected in the glasses sintered under H 2 /He atmosphere.…
Abstract Acrylic monomers were graft copolymerized onto gelatin chains using potassium persulfate in aqueous medium. The graft copolymers were then treated with glutaraldehyde to establish crosslinks between gelatin macromolecules. This yielded a rigid water insoluble protein network sporting grafted chains at random.…
Abstract A finite element algorithm is presented for simultaneous calculation of the steady state, axisymmetric flows and the crystal, melt/crystal and melt/ambient interface shapes in the Czochralski technique for crystal growth from the melt. The analysis is based on mixed Lagrangian finite element approximations to…
Our studies, which are aimed at understanding the catalytic mechanism of the beta subunit of tryptophan synthase from Salmonella typhimurium, use site-directed mutagenesis to clarify the functional roles of several putative active site residues. Although previous chemical modification studies have suggested that histi…
Abstract Hydrolyses of selected soluble polysaccharides (e.g., polyoses) and disordered and crystalline celluloses, each bearing 2‐diethylaminoethyl (DEAE) substituents at low degree of substitution (DS < 0.05) were explored in 100% and 2 N trifluoroacetic acid (TFA). Analyses were evaluated relative to hydrolysis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies of electrochemically crystallized halides of 1,4,5,8-tetraselenonaphthalene (TSeN)Lewis A. Acampora, Boris S. Elman, Daniel J. Sandman, Susan Jansen, M. Thomas Jones, Raymond D. Rataiczak, and Bruce M. FoxmanCite this: Inorg. Chem. 1989, 28, 8…
Molecular-dynamical calculations show that bcc metals are classified into two groups [(Mo, W, Fe) and (V, Nb, Ta)] concerning the configurations of irradiation-produced point defects. The potentials used are those constructed from elastic constants by Johnson and Wilson. In the first group, the stable interstitial pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and crystal structure of (hexamethyldibenzotetraazaannulenato)nickel-TCNQ. A mixed-stack donor-acceptor molecular solidPeter J. Spellane, Leonard V. Interrante, Rudolph K. Kullnig, and Fook S. ThamCite this: Inorg. Chem. 1989, 28, 8, 1587–1590Publication Date (Prin…
Solute transport in Czochralski (CZ) crystal growth and in magnetic Czochralski (MCZ) with a vertical applied field are simulated numerically, and compared with published experimental data on gallium segregation in silicon growth. In the MCZ cases, the low segregation coefficient of 0.008 leads to a steep concentratio…
"Heterojunctions" have been fabricated by the reactive evaporation of thin film n-type ZnO onto p-type single crystal Zn 3 P 2 , polycrystalline films of Zn 3 P 2 , and single crystal CdTe. The photovoltaic response of the n-ZnO – single crystal p-CdTe devices was good, that of the n-ZnO – single crystal p-Zn 3 P 2 de…