Size and shape evolution of core–shell nanocrystals
The findings of an investigation of temperature-manipulated size and shape evolution for pre-formed decanethiolate–encapsulated gold nanocrystals are described.
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Storage of partially deacetylated chitosan films
Chitosan has wide-ranging applications as a biomaterial, but its stability in storage is not widely known. The objective of this study was to evaluate the storage stability of films prepared from chitosan of 77% deacetylation. Both the neutralized and acetate films were evaluated, as chitosan salts offer the advantage…
Conservation of ancient lead artifacts corroded in organic acid environments: electrolytic stabilization/consolidation
An electrolytic reduction treatment using cathodic polarization at constant potential was applied to heavily corroded lead objects which had been exposed for a long time to corrosive organic acid vapours. Experimental conditions were determined through chemical and electrochemical tests conducted on artificially carbo…
Encapsulation of calcium carbonate by styrene polymerization
In order to obtain composites of calcium carbonate (CaCO3) encapsulated by polystyrene (PS), soapless polymerization of styrene (S) in aqueous phase in the presence of CaCO3 was carried out. Influences on the encapsulation and on monomer conversion were studied. Results showed that monomer conversion higher than 52% c…
Study on electronic structure of CaTiO3by spectroscopic measurements and energy band calculations
The electronic structure of CaTiO 3 was experimentally examined by x-ray and ultraviolet photoemission spectroscopy, bremsstrahlung isochromat spectroscopy (BIS) and x-ray absorption spectroscopy. The photoemission spectra and BIS spectra were compared with the partial density of states (PDOS) estimated by an energy b…
meso-Aryl sapphyrins with heteroatoms; synthesis, characterization, spectral and electrochemical properties
The synthesis, characterization and spectral properties of six new meso-aryl core modified sapphyrins are described. An efficient approach involving an acid catalyzed condensation of bithiophene diol 1 and modified tripyrranes 2a–2e allows preparation of the desired meso-aryl sapphyrins in 16–36% yield. The product di…
Effect of formulation variables on cis-platin loaded chitosan microsphere properties
Chitosan microspheres containing cis-platin were prepared using a w/o emulsion system. Variables important for microsphere properties were investigated: these include; chitosan, cis-platin and glutaraldehyde concentrations, the types of chitosan and oil, the cross-linking process and stirring rate. Chitosan and glutar…
Solid oxide fuel cell using Co doped La(Sr)Ga(Mg)O3 perovskite oxide with notably high power density at intermediate temperature
Power generation characteristics of fuel cells was greatly improved by using La0.8Sr0.2Ga0.8Mg0.115Co0.085O3 as electrolyte. In particular, the maximum power density attained a value of 1.53 and 0.50 W cm–2 at 1073 and 873 K, respectively, in an H2–O2 cell when the thickness of electrolyte was 0.18 mm.
Charge transport and electron-hole-pair creation energy in stabilized a-Se x-ray photoconductors
The suitability of stabilized amorphous selenium (a-Se:0.2-0.5% As, 10-20 ppm Cl) as an x-ray imaging photoconductor is largely determined by its charge-generation, transport and trapping properties. The product of the charge-carrier drift mobility, , deep-trapping lifetime, , and applied electrical field, F , known a…
Difference density quality (DDQ): a method to assess the global and local correctness of macromolecular crystal structures
Methods for the evaluation of the accuracy of crystal structures of proteins and nucleic acids are of general importance for structure-function studies as well as for biotechnological and biomedical research based upon three-dimensional structures of biomacromolecules. The structure-validation program DDQ (difference-…
Discrimination between dipolar and space-charge relaxation by thermally stimulated current spectroscopy: application to several alkali-exchanged mordenites
Thermally stimulated current (TSC) spectroscopy is widely used to understand dielectric relaxation in complex solid systems. However, when these systems contain free and bound charges, it appears that TSC spectra exhibit multicomponent signals, due both to dipolar and to space-charge relaxation. In this work, we propo…
Magnetization studies in quasi two-dimensional palladium nanoparticles encapsulated in a graphite host
In this work, magnetization studies on quasi bi-dimensional nanoparticles of Pd encapsulated in a graphite host as a function of magnetic field and temperature are presented. We found that an important magnetic signal can be attributed to the Pd nanoparticles. The obtained magnetic behaviour is interpreted in view of…
Structural Stability in Engineering Practice
Preface. Loss of stability and post-buckling behaviour. Summation theorems concerning critical loads of bifurcation. Interaction of different buckling modes in the post-buckling range. Stability of elastic structures with the aid of the catastrophe theory. Buckling of frames. Application of the sandwich theory in the…
Influence of radiation environments on space charge formation in γ-irradiated LDPE
In the present paper the formation of space charge in irradiated low-density polyethylene (LDPE) was investigated using the pulsed electroacoustic (PEA) technique. Specimens of LDPE, /spl sim/100 /spl mu/m thick, were irradiated to various doses at room temperature in a /sup 60/Co /spl gamma/ source in one of three di…
Spectroscopic characterization of an MoOx layer on the surface of silica. An evaluation of the molecular designed dispersion method
Silica-supported molybdenum oxide catalysts have been prepared by liquid and gas phase deposition, followed by calcination of the deposited molybdenyl acetylacetonato complex. Fourier-transform infrared spectroscopy indicated a hydrogen bonding anchorage mechanism for the liquid phase deposition and a two step reactio…
Z-Isomers of 3,3′-disubstituted azobenzenes highly compatible with liquid crystals
It is known that mesophase changes can be induced by E-Z photoisomerization of azobenzenes doped in liquid crystals. Novel azobenzenes have been designed on the basis of Molecular Mechanics and Molecular Orbital calculation, aimed at exploiting novel photoresponsive guest-host liquid crystalline systems exhibiting no…
Optical and thermal properties of cholesteric solid from dicholesteryl esters of diacetylenedicarboxylic acid
Dicholesteryl esters of diacetylenedicarboxylic acid with different lengths of methylene linkages were synthesised. Compounds with (CH 2 ) n (n = 2, 4, 5, 6, 7, 8, 10) showed a cholesteric phase. Phase transition temperatures from the isotropic phase to the anisotropic phase showed an odd–even effect of the number of…
Size and fit: The development of size charts for clothing — Part 3
A survey of 100 young women's body measurements was undertaken during 1992/93. The findings are the basis of Part 3, which aims to explain how size charts are developed for garments; to evaluate the measuring equipment used and to compare the size chart body measurements with those proportionally derived by traditiona…
Tensile, Solubility, and Electrophoretic Properties of Egg White Films as Affected by Surface Sulfhydryl Groups
ABSTRACT Films plasticized with polyethylene glycol were cast from alkaline (pH 10.5, 11.0, or 11.5), aqueous egg white (EW) solutions with or without heating (40°C for 30 min). Prior to casting, concentration of surface sulfhydryl (SH) groups was determined and they increased (P < 0.05) (3.81–19.45 μM/g protein) w…
Large Scale Simulation of Dendritic Growth in Pure Undercooled Melt by Phase-field Model.
In this study we presented a double-grid method for efficient computation of complex dendritic pattern evolving in a large scale solidifying system of pure undercooled melt. The method, which is based on the large difference in phase-field diffusivity and thermal diffusivity in pure material, enables us to use a large…