Materials Literature
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The correlation between the Raman peak shift and the linewidth of porous silicon is studied. The experimental result does not fit with the relationship predicted by the phonon confinement model. By taking into account both the phonon confinement and the effect of strain, the calculated Raman line shape coincides fairl…
Grain protein-based films containing mixtures of glycerin and polyethylene glycol (PEG) as plasticizers were prepared and evaluated for water vapor permeability (WVP), tensile strength (TS), and elongation (E). Changes in mechanical properties during storage were also studied. The PEG produced opposite trends in E of…
The in vitro degradation of samples of L- and D,L-lactic acid polymers, P(L)LA and P(DL)LA respectively, having different molecular weights, morphology and/or geometry, has been studied through the determination of viscometric molecular weight, mass and mechanical properties as function of the immersion time in Ringer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar phase of a symmetric triblock copolymerM. W. Matsen and M. SchickCite this: Macromolecules 1994, 27, 1, 187–192Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021/ma00…
A single LiB/sub 3/O/sub 5/ crystal cut normal to x(=a) and z(=b) can be used for the 90/spl deg/ phase-matched SHG at 0.475-0.875 /spl mu/m by heating the crystal from /spl sim/20 to 320/spl deg/C. The improved Sellmeier's equations and new formula of the temperature variation of the refractive indexes are presented.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZeolite encapsulated cobalt(II) and copper(II) perfluorophthalocyanines. Synthesis and characterizationKenneth J. Balkus Jr., Alexei G. Gabrielov, Stephen L. Bell, Fethi Bedioui, Lionel Roue, and Jacques DevynckCite this: Inorg. Chem. 1994, 33, 1, 67–72Publication Date (Prin…
Epidermal keratinocytes are ideal as a model system for the study of mammalian differentiation because primary cells have a high proliferative capacity and can be cultured under conditions enabling a balance of growth and differentiation. In addition, epidermal keratin genes have been cloned and characterized, and the…
Abstract The knowledge of starch pastes behavior during frozen storage becomes necessary to understand more complex systems (e.g. sauces, dressings and desserts) The effect of sub‐zero storage on the quality attributes of corn starch pastes (10% w/w) with and without xanthan gum (0.3% w/w) was analyzed. Pastes were fr…
Dielectric properties of relaxor ferroelectrics are characterized by giant and temperature-insensitive dielectric constants and large frequency dependence (dielectric relaxation), and therefore useful for high permittivity capacitors. Relaxor ferroelectrics also reveal superior characteristics in electrostriction and…
Abstract Layer charge is recognized as the single most important characteristic of 2:1 phyllosilicates. It indicates a mineral's capacity to retain cations and to adsorb water and various polar organic molecules. The affinity of organic-clays for sorption of organic contaminants in aqueous systems is now attracting co…
A rapid, direct nitridation process for the manufacture of sinterable aluminum nitride (A1N) powder was developed at the pilot scale. Atomized aluminum metal and nitrogen gas were heated and reacted rapidly to synthesize A1N while they passed through the reaction zone of a transport flow reactor. The heated walls of t…
Initial clinical studies with doxorubicin entrapped in the bilayer of phosphatidylglycerol-rich liposomes were hindered by the avid reticuloendothelial system (RES) uptake and by drug leakage from circulating liposomes. In contrast, recent tests of a doxorubicin formulation of polyethyleneglycol-coated liposomes (Doxi…
We describe the preparation and characterisation of colloidal dispersions of polypyrrole–silica nanocomposite particles. These nanocomposites have been characterised in terms of their particle size and chemical composition by a wide range of experimental techniques, including transmission electron microscopy, disc cen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transitions of polymers with compressed fluid diluents: type II and III behaviorP. D. Condo, D. R. Paul, and K. P. JohnstonCite this: Macromolecules 1994, 27, 2, 365–371Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxylated nylons based on unprotected esterified D-glucaric acid by simple condensation reactionsD. E. Kiely, L. Chen, and T. H. LinCite this: J. Am. Chem. Soc. 1994, 116, 2, 571–578Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Publ…
Supported reagents have been widely used in organic synthesis for some 25 years and their importance is likely to increase as a result of new environmental legislation and the drive towards clean technology. While many supported reagents are stoichiometric in reactions the successful development of genuinely catalytic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputation and management of chemical properties in CACTVS: An extensible networked approach toward modularity and compatibilityWolf Dietrich Ihlenfeldt, Yoshimasa Takahashi, Hidetsugu Abe, and S. SasakiCite this: J. Chem. Inf. Comput. Sci. 1994, 34, 1, 109–116Publication D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of leucoemeraldine and effect of redox reactions on molecular weight of chemically prepared polyanilineYen Wei, Kesyin F. Hsueh, and Guang Way JangCite this: Macromolecules 1994, 27, 2, 518–525Publication Date (Print):January 1, 1994Publication History Published onli…
Results of a study performed to obtain a better understanding of the material characteristics responsible for hydrophobicity recovery leading to a high wet surface resistance in silicone rubbers used for outdoor HV insulation, are reported. The samples were obtained from new and artificially aged HV insulators using H…
A method was developed to identify compensating changes between residues at positions in a multiple sequence alignment. (For example, one position might always contain a positively charged residue when the other is negatively charged and vice versa.) A correlation-based method was used to measure the compensation foun…