Materials Literature
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Gold colloids have been homogeneously coated with silica using the silane coupling agent (3-aminopropyl)trimethoxysilane as a primer to render the gold surface vitreophilic. After the formation of a thin silica layer in aqueous solution, the particles can be transferred into ethanol for further growth using the Stöber…
Selected aspects of recent progress in the study of supercooled liquids and glasses are presented in this review. As an introduction for nonspecialists, several basic features of the dynamics and thermodynamics of supercooled liquids and glasses are described. Among these are nonexponential relaxation functions, non-A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent and Redox-Active Polynuclear Transition Metal Complexes†Vincenzo Balzani, Alberto Juris, Margherita Venturi, Sebastiano Campagna, and Scolastica SerroniView Author Information Dipartimento di Chimica "G. Ciamician", Università di Bologna, 40126 Bologna, Italy Dip…
We describe the synthesis of ZnS-capped CdSe semiconductor nanocrystals using organometallic reagents by a two-step single-flask method. X-ray photoelectron spectroscopy, transmission electron microscopy and optical absorption are consistent with nanocrystals containing a core of nearly monodisperse CdSe of 27−30 Å di…
Semiconductor nanocrystals exhibit a wide range of size-dependent properties. Variations in fundamental characteristics ranging from phase transitions to electrical conductivity can be induced by controlling the size of the crystals. The present status and new opportunities for research in this area of materials physi…
Abstract Polymer nanocomposites with layered silicates as the inorganic phase (reinforcement) are discussed. The materials design and synthesis rely on the ability of layered silicates to intercalate in the galleries between their layers a wide range of monomers and polymers. Special emphasis is placed on a new, versa…
Detector systems introduce distortions into acquired data. To obtain accurate angle and intensity information, it is necessary to calibrate, and apply corrections. Intensity non-linearity, spatial distortion, and non-uniformity of intensity response, are the primary considerations. It is better to account for the dist…
An investigation was made of the spectral characteristics of an SRS-active mode in a barium nitrate crystal by the method of two-photon Raman amplification. At room temperature the width of this vibrational mode was 0.6 cm -1 . The experimental temperature dependence of the linewidth was analysed within the framework…
The stress corrosion cracking (SCC) susceptibility of types 304 and 316L austenitic stainless steels in the high temperature water was examined with combinations of the sensitization and cold working. Transgranular stress corrosion cracking (TGSCC) susceptibility of cold worked material was high in highly cold worked…
Vehicle weight reduction is one of the major means available for improving automotive fuel efficiency. Although high-strength steels, aluminum (Al), and polymers are already being used to achieve significant weight reductions, substantial additional weight reductions could be achieved by increased use of magnesium (Mg…
This book is based on the lectures of Prof.dr.ir. F.H. Kreuger at the Delft University of Technology.
In the method of characteristics as applied to two-dimensional lattice physics computations, one integrates the transport equation along three-dimensional ray paths corresponding to the discretization chosen for the angular flux {Psi}. The result of integrating through zone i, assuming constant {Sigma}{sub i} and a co…
Understanding the role of ionic current flow within a crack and near the crack tip is fundamental to modeling of environmentally assisted crack advance. Critical conceptual issues and models related to ionic current flow within cracks, and the associated ``crevice`` chemistry and metal oxidation that results, are pres…
Crystallization from solutions , Crystallization from solutions , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Preface Mechanics of particle adhesion D.S. Rimai, L.P. DeMejo and R.C. Bowen The role of adhesion in the impact of elastic spheres K.L. Johnson and H.M. Pollock Surface roughness and its influence on particle adhesion using atomic force techniques D.M. Schaefer, M. Carpenter, B. Gady, R. Reifenberger, L.P. DeMejo and…
The angular intensity distribution of He beams scattered from compact clusters and from diffusion limited aggregates, epitaxially grown on metal surfaces, is investigated theoretically. The purpose is twofold: to distinguish compact cluster structures from diffusion limited aggregates, and to find observable {\em sign…
Abstract Dibutyrylchitin was prepared by treatment of krill chitin with butyric anhydride in the presence of perchloric acid as a catalyst of reaction carried out at 25 to 30°C. Dibutyrylchitin is easily soluble in several organic solvents, such as acetone, alcohols, methylene chloride, and dimethylformamide. Samples…
We have measured the nondipolar contribution to the Ar $1s$ photoelectron angular distribution over the 30--2000 eV electron-energy range. The nondipolar interaction results in a forward or backward asymmetry with respect to the photon beam. The asymmetry is directed backward near threshold, is symmetric near 230 eV,…
This study reports UV-photoemission (UPS) measurements made on boron nitride crystals and thin films. The materials examined are commercial grade c-BN powder and thin films of BN deposited with ion beam assisted e-beam evaporation and laser ablation. The thin film samples examined exhibited varying amounts of sp3 (cub…
By focusing on entire bubbles rather than films or vertices, a simple model is proposed for the deformation and flow of foam in which dimensionality, polydispersity, and liquid content can easily be varied. Simulation results are presented for the linear elastic properties as a function of bubble volume fraction, show…