Materials Literature
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We present the results of an extensive molecular-dynamics simulation of a dense polymer system. We show for the first time that simulations are able to cover the whole regime from pure Rouse dynamics to reptation dynamics and give strong evidence of the latter. The mean square displacements clearly exhibit a ${t}^{\fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoluminescence and relaxation dynamics of cadmium sulfide superclusters in zeolitesYing Wang and Norman HerronCite this: J. Phys. Chem. 1988, 92, 17, 4988–4994Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1…
Abstract Over the last four decades, numerous reports have appeared on the physico‐chemical kinetics, especially crystallization kinetics, based on the Avrami equation, ϕ = exp [− Kt n ] where ϕ is the fraction of material unchanged at time t , K is an overall rate constant and “ n ” is the Avrami exponent indicative…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT6-311G(MC)(d,p): a second-row analogue of the 6-311G(d,p) basis set: calculated heats of formation for second-row hydridesMing Wah Wong, Peter M. W. Gill, Ross H. Nobes, and Leo RadomCite this: J. Phys. Chem. 1988, 92, 17, 4875–4880Publication Date (Print):August 1, 1988Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and morphology of syndiotactic polypropylene single crystalsBernard Lotz, Andrew J. Lovinger, and Rudolf E. CaisCite this: Macromolecules 1988, 21, 8, 2375–2382Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published in…
The solid electrolyte of the system exhibited high ionic conductivity, as well as almost unity ionic transference number at 600°–1000°C. High current density and electrical power can be obtained from a fuel cell at 600°–800°C. was an excellent cathode as compared with Pt electrode. A thin film of stabilized zirconia c…
Silica film was deposited on the surface of soda lime silicate glass by immersing it in hydrofluosilicic acid solution supersaturated with silica gel at low temperature. The composition and the structure of these films were evaluated using ESCA, IRRS, fluoric acid etching test, and sodium leaching test, and they were…
The acoustic transients emitted after breakdown and cavitation bubble collapse upon focusing a Q-switch laser pulse into a liquid are investigated with special emphasis on their modifications induced by a solid boundary. For measuring the form p(t)/pmax of the pressure pulses an optical technique with a resolution of…
Summary The mobility of a foam depends heavily on its texture, which is the distribution of bubble sizes in the dispersion. To incorporate this variable in a mechanistic simulator, the usual conservation equations are coupled with balances on the densities of flowing and stationary bubbles in the foam. This approach t…
The nematic--to--smectic-A transition in liquid crystals is analogous to the normal to superconducting transition in metals with the Frank director n in liquid crystals playing the role of the vector potential A in metals. The liquid-crystal analog of an external magnetic field is a field, arising, for example, from m…
Summary The stability of foam lamellae is limited by capillary pressure. Consequently, as the fractional flow of gas in a foam is raised at a fixed gas velocity, the capillary pressure in a porous medium at first increases and then approaches a characteristic value, here called the "limiting capillary pressure." If th…
Pseudomonas oleovorans was grown in homogeneous media containing n-alkanoic acids, from formate to decanoate, as the sole carbon sources. Formation of intracellular poly(beta-hydroxyalkanoates) was observed only for hexanoate and the higher n-alkanoic acids. The maximum isolated polymer yields were approximately 30% o…
Abstract We present new calculations of electron inelastic mean free paths (IMFPs) for 200–2000 eV electrons in 27 elements (C, Mg, Al, Si, Ti, V, Cr, Fe, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi) and four compounds (LiF, SiO 2 , ZnS and Al 2 O 3 ). These calculations are based on an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of the grafted polymer brushS. T. Milner, T. A. Witten, and M. E. CatesCite this: Macromolecules 1988, 21, 8, 2610–2619Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissue 1 August 1988https://pubs.acs.org/doi/10.1021/…
Pb1−x EuxS films were prepared for the first time using hot wall epitaxy technique. X-ray diffraction and optical transmission measurements were performed for the films. Films with energy gaps up to 0.9 eV (up to x=0.2) were obtained. Lattice constants of the films were very close to that of PbS as is expected from th…
Epitaxial films of barium hexaferrite (BaFe12 O19 ) have been prepared on basal-oriented sapphire substrates by rf sputter deposition of an amorphous ferrite film and crystallization of the film by annealing. Liquid phase epitaxy has been used to deposit an additional barium hexaferrite layer on top of the sputter dep…
A theory of transitions between tilted hexatic-$I$ and -$F$ phases in liquid-crystal films is developed. A renormalization-group analysis leads to four tilted hexatic phases: the hexatic-$I$ and -$F$ phases, an intermediate hexatic-$L$ phase, and an unlocked phase. All these phases except the unlocked phase also exist…
The thermal conductivity lambda and heat capacity rho c P per unit volume of single-crystal Si have been measured under hydrostatic pressure up to 1 GPa at room temperature. The thermal conductivity was found to increase slightly with increasing pressure. For the volume dependence of lambda expressed in terms of the B…
Abstract The series of nylon 612 copolymers was synthesized from caprolactam (C) and laurolactam (L) at 145°C. The 50/50 C/L molar ratio copolymer was found to have the minimum melting temperature ( T m ) for the series. The glass transition temperatures ( T g 's) of the copolymers were affected by the crystallinity o…
Abstract The stress relaxation behavior of model silicone room temperature vulcanizing (RTV) elastomers has been used to examine the chemistry of the cured silicone network. It has been shown that the tin crosslinking catalyst, together with water, produces siloxane bond rearrangement which results in chemical stress…