Materials Literature
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The formation of platinum sols (〈d〉 = 1.5-4 nm) in a methanol-water mixture by methanol reduction of ionic platinum in the presence of steric stabilizer poly(vinylpyrrolidone) has been studied by transmission electron microscopy and UV-visible spectrophotometry. A high concentration of chloride ions present in the rea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLipase-Catalyzed Ring-Opening Polymerization of 12-DodecanolideHiroshi Uyama, Kazuhiro Takeya, Norio Hoshi, and Shiro KobayashiCite this: Macromolecules 1995, 28, 21, 7046–7050Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published ini…
A model of the formation of a p-type surface conductive layer on deposited diamond films is proposed. According to the model, the ionization of acid in water produces oxonium ion ( H 3 O + ) which reacts with hydrogen on diamond films and causes the creation of holes in diamond films. The model also explains the disap…
The vibrational and relaxational dynamics of glycerol has been measured by incoherent neutron scattering for energy transfers from some 10 \ensuremath{\mu}eV to several 10 meV, and for temperatures from 4 to 413 K. On heating towards and above the glass transition, scattering from low-frequency vibrations shows an uns…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Ultrafine Metal Particles in Ethanol by UV Irradiation Using a PhotoinitiatorTetsuyuki Itakura, Kanjiro Torigoe, and Kunio EsumiCite this: Langmuir 1995, 11, 10, 4129–4134Publication Date (Print):October 1, 1995Publication History Publishe…
Theoretically, lyotropic behavior of flexible polymers can be induced by associating the polymers with a large amount of long-tail surfactants leading to bottle-brush type conformations in suitable solvents. To address this and related questions, complexes of poly(2-vinylpyridine) (P2VP) and poly(4-vinylpyridine) (P4V…
Native thermolysin binds a single catalytically essential zinc ion that is tetrahedrally coordinated by three protein ligands and a water molecule. During catalysis the zinc ligation is thought to change from fourfold to fivefold. Substitution of the active-site zinc with Cd2+, Mn2+, Fe2+, and Co2+ alters the catalyti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular-Level Processing of Conjugated Polymers. 2. Layer-by-Layer Manipulation of In-Situ Polymerized p-Type Doped Conducting PolymersA. C. Fou and M. F. RubnerCite this: Macromolecules 1995, 28, 21, 7115–7120Publication Date (Print):October 1, 1995Publication History Pub…
Nanocrystals of group-IV semiconductor materials (Si, Ge, and SiGe) have been fabricated in SiO2 by ion implantation and subsequent thermal annealing. The microstructure of these nanocrystals has been studied by transmission electron microscopy. Critical influences of the annealing temperatures and implantation doses…
Effective tailoring of pore sizes in mesoporous molecular sieves (see Figure) has been achieved by a novel method involving the restructuring of the mesopores under mild aqueous conditions. A studyis reported aimed at elucidating the underlying chemistry. It is suggested that further investigation could provide insigh…
A method is presented to facilitate the isolation of mutations in plant genes, which requires knowledge of the target gene or protein sequence, and is independent of mutant phenotype. The polymerase chain reaction was used to amplify the junctions between a T-DNA insert and the gene of interest from pools of mutant pl…
The authors report $^{13}\mathrm{C}$ NMR spin-lattice relaxation rates 1/${\mathit{T}}_{1}$ and Knight shifts ${\mathit{K}}_{\mathit{S}}$ in the quasi-two-dimensional organic superconductor \ensuremath{\kappa}-(ET${)}_{2}$Cu[N(CN${)}_{2}$]Br (${\mathit{T}}_{\mathit{c}}$=11.6 K), for an aligned single crystal. The norm…
We have investigated the equilibrium compositions and structures of the phases of nearly-hard-sphere binary colloids and obtained experimental phase diagrams. Aqueous dispersions of charge-stabilized polystyrene spheres were studied in the hard-sphere limit, with sphere-diameter ratios ranging from 2 to 12 and total v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Soluble Self-Acid-Doped Conducting Polyaniline: Structure and PropertiesShow-An Chen and Gue-Wuu HwangCite this: J. Am. Chem. Soc. 1995, 117, 40, 10055–10062Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 Octobe…
The importance of collective motions in proteins, such as hinge-bending motions or motions involving domains, has been recognized. Occurrence of such motions and their experimental and theoretical studies are reviewed. Normal-mode analysis and principal component analysis are powerful theoretical tools for studying su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectroluminescence from Substituted Poly(thiophenes): From Blue to Near-InfraredM. R. Andersson, M. Berggren, O. Inganaes, G. Gustafsson, J. C. Gustafsson-Carlberg, D. Selse, T. Hjertberg, and O. WennerstroemCite this: Macromolecules 1995, 28, 22, 7525–7529Publication Date…
A photobleaching technique has been used to observe rotational dynamics of dilute probe molecules in supercooled o-terphenyl (OTP). The nonexponential rotational relaxation of the probe molecules is shown to be due, at least in part, to the presence of spatial heterogeneity in the host dynamics. Under appropriate phot…