Materials Literature
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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…
Abstract A thermogravimetric/mass spectrometric (TG/MS) system was used to characterize the thermolysis reactions of (4‐O‐methyl‐ D ‐glucurono)‐ D ‐xylan. The mass spectrometric peaks, measured as function of time, were attributed to water, methanol, carbon monoxide, carbon dioxide, formaldehyde, formic acid, acetic a…
Abstract The moisture‐induced plasticization of some amorphous polyamides in pure and blended form has been determined by calorimetric methods. The compositional dependence of the glass transition temperature of these polymer‐diluent systems has been adequately accounted for using an existing predictive expression der…
Abstract The Sanchez‐Lacombe equation of state was used to model the sorption of high‐pressure gases into solid, amorphous polymers and molten polymers. Only one adjustable parameter per binary pair, δ 12 , was used in the mixing rules to correct the deviation of the characteristic pressure of the mixture, P 12 * , fr…
The mobility of foams in porous media is dominated by foam texture (i.e., foam bubble size). The effect of bubble size can be incorporated into a reservoir simulator by adding balances on the number density of bubbles in flowing and stationary foam to the equations of mass, momentum, and energy conservation. These bal…
Abstract Average advancing and receding contact angles made against cotton and glass fibers by a set of probe liquids are determined using the Wilhelmy technique. The dispersive and polar components of the surface energy are calculated from the measured contact angles using both the geometric and the harmonic mean met…
The stoichiometric complex formed between human leukocyte elastase and a synthetic MeO-Suc-Ala-Ala-Pro-Val chloromethyl ketone inhibitor was co-crystallized and its X-ray structure determined, using Patterson search methods. Its structure has been crystallographically refined to a final R value of 0.145 (8.0 and 2.3 A…
Diamond-like carbon films have been deposited onto clean, unseeded substrates using a hybrid ion beam technique. In this method the ion fluences available for acceleration were particularly enhanced by the use of laser ablation plumes ejected from highly purified graphite targets. The combination of levels of purity c…
We report frequency-dependent measurements of the specific heat ${c}_{p}$ thermal conductivity $\ensuremath{\kappa}$ of ${(o\ensuremath{-}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\mathrm{l})}_{1\ensuremath{-}x}{(o\ensuremath{-}\mathrm{p}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{y}\ma…
A field-effect transistor structure is used to study the transport properties of the soluble conductive polymer, poly(3-hexylthiophene). We have measured conductance, mobility, and carrier concentration in undoped polymer thin films. The field-effect mobility was found to be 10−5–10−4 cm2/V s at room temperature. The…