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A review is given of the phenomenological description, the experimental determination and the theoretical considerations and calculations of the anchoring energy in liquid crystals. The order of magnitude of the anchring energy is also compared with the bulk and interfacial energies of liquid crystals.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[p-(formyloxy)styrene]: synthesis and radiation-induced decarbonylationJean M. J. Frechet, Theodore G. Tessier, C. Grant Willson, and Hiroshi ItoCite this: Macromolecules 1985, 18, 3, 317–321Publication Date (Print):March 1, 1985Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe clusters [Co8S6(SPh)8]4-,5-: preparations, properties, and structural relationship of near-cubic Co8(.mu.4-S)6 cores to the clusters in synthetic pentlanditeG. Christou, K. S. Hagen, J. K. Bashkin, and R. H. HolmCite this: Inorg. Chem. 1985, 24, 7, 1010–1018Publication D…
The phase-matched generation of the optical second harmonic was investigated in the chiral smectic C* phase of a classical ferroelectric liquid crystal (DOBAMBC). The phase-matching was achieved either by incidence angle or by temperature tuning. The temperature behaviour of the second order nonlinear susceptibility w…
Electron microscope observations of domain configurations associated with the incommensurate phases of quartz and aluminum phosphate are presented and successfully interpreted in terms of a theoretical model.
The fraction of four‐coordinated boron was observed to increase from 10% in a rapidly cooled aluminum borosilicate glass fiber to 16% in the same fiber after it was annealed; the refractive index also increased. The index of the annealed fiber agreed with that of the bulk glass. Crystallization was not observed in the…
The thermal degradation of cellulose and its phosphorylated products (phosphates, diethylphosphate, and diphenylphosphate) were studied in air and nitrogen by differential thermal analysis and dynamic thermogravimetry from ambient temperature to 750°C. From the resulting data various thermodynamic parameters were obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of platinum deposition by photoelectrolysis in illuminated suspensions of semiconducting titanium dioxideJ. S. Curran, J. Domenech, N. Jaffrezic-Renault, and R. PhilippeCite this: J. Phys. Chem. 1985, 89, 6, 957–963Publication Date (Print):March 1, 198…
Abstract The copolymer system HBA (4‐hydroxybenzoic acid) and HNA (2,6‐hydroxyhaphthoic acid) has been studied mainly by means of differential scanning calorimetry. Heat capacities for the two homopolymers and three copolymers are reported from 175 to 650 K. The heat capacities are additive with composition. The whole…
We construct a theory of velocity selection and tip stability for dendritic growth in the local evolution model. We show that the growth rate of dendritic patterns is determined by a nonlinear solvability condition for a translating finger. The sidebranching instability is related to a single discrete oscillatory mode…
Conductivity, thermoelectric power, spin concentration and spin dynamics has been measured in polyaniline samples equilibrated at different pH. Data provide evidence for Metal-Insulator transition upon pH variation.
The interaction of carbon monoxide and submonolayer coverages of potassium on Ru(001) has been investigated with high resolution electron energy loss spectroscopy, LEED, Auger electron spectroscopy, thermal desorption, and work function measurements. The adsorption of potassium on ruthenium at submonolayer coverages (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuterium isotope effects on the ligand field excited-state kinetics of hexaamminerhodium(III)Mark E. Frink and Peter C. FordCite this: Inorg. Chem. 1985, 24, 7, 1033–1035Publication Date (Print):March 1, 1985Publication History Published online1 May 2002Published inissue 1…
Measurements of the physical properties of 1-octadecylamine were carried out in a temperature range of 30 to 120°C. The melting point of the compound was observed at 55°C and no liquid crystalline phase was found within this temperature range. The decomposition point of the carbonate of this amine was found to be a li…
The Stage I work-hardening behaviour of disordered Cu3Au single crystals containing volume fractions, f, of SiO2 particles equalling 0·005 and 0·01, oriented for single slip on (111)[101], was studied in compression at 77 K and 295 K. At 295 K, Lüders-band propagation was found to obscure the work-hardening behaviour…
The variation with water content of dc conductivity and Na diffusion coefficient for the Na 2 O · 4siO 2 and Na 2 O · 2SiO 2 glass systems was found to be similar to that of the Na 2 O.3SiO 2 series reported earlier. The conductivity was estimated for the ternary system Na 2 O‐H 2 O‐SiO 2 by combining the present resu…
The characteristics and mechanisms for the adsorption of iodine from aqueous solutions or from organic solvents on activated carbon were studied. Most adsorption terminated in 24 h, but a very slow adsorption was observed even after 2 d for aqueous solutions. It was found that the adsorbed species could be quantitativ…
SUMMARY The recuperation of the soil during bush fallows after a period of cultivation is an important part of the success of shifting cultivation in the lowland humid tropics. However, the sources of the nutrients which enable the observed rapid growth on apparently exhausted soils has never been satisfactorily expla…
Abstract Picosecond transient Spectroscopy has been used to measure excited state lifetimes ancfrspectra of Cr, Mn, Fe, Sn and Pb meso‐tetraphenylporphyrins. Excited state spectra are typical of π,π * states, and lifetimes vary from > 20 ns in Cr(III) tetraphenylporphyrin to 8 ps in Mn(II). This contrasting behavio…
Abstract Secondary cartilage forms on avian and mammalian dermal bones, both during normal ontogeny and during repair of fractures, but it has not been observed in any other vertebrate class. We fractured the left lower jaws of adult spotted salamanders, Ambystoma maculatum , to see whether secondary cartilage would f…