Supramolecular structure of disperse phase of detergent oil additives

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 25–27, June, 1990.     

Mass Transport in the PbI2–I2 System

PbI₂ transport in the PbI₂–I₂ system is analyzed using a model of mass transport in a nonisothermal one-dimensional system of constant volume containing one or two vapor species. The derived equations provide a self-consistent solution to the problem of mass transport and pressure distribution in the system. Experimental results confirm that the rate of mass transport is governed by the source and deposition temperatures and iodine vapor pressure. The optimal conditions of PbI₂ crystal growth from the vapor phase are established.     

Morphology,elemental composition,and mechanical properties of polycrystalline CdTe layers

The results of investigations of the morphology (grain size, twinning, growth features), elemental composition, and some mechanical properties of polycrystalline CdTe layers deposited on nonoriented substrates in a quasi-closed volume are presented. Dependences of microhardness on the crystallite size and layer thickness are presented. The evaluation calculations of the stresses on the substrate-layer interface caused by a difference in the linear thermal expansion coefficients are presented.     

Effect of Growth Conditions on the Morphology and Structural Perfection of Vapor-Grown PbI2 Crystals

Data are presented on the morphology and structural perfection of PbI₂ crystals grown from the vapor phase in a closed system. By varying growth conditions, platelike, ribbon, needle, twinned, and dendritic crystals were prepared, as well as combinations and intergrowths of these habits.     

Corrosion Behavior of Modified Anodic Oxide Coatings on AD31 Aluminium Alloy

Protection of Metals and Physical Chemistry of Surfaces - The dependences of the protective properties of the anodic oxide coatings on the AD31 aluminum alloy surface modified with nitrates of...     

The Effect of Ultrasound Treatment on Physicochemical and Tribological Properties of Electrolytic Cu–Sn–TiO2 Coatings

Protection of Metals and Physical Chemistry of Surfaces - In this work, Cu–Sn–TiO2 composite coatings have been deposited from an oxalic acid electrolyte additionally containing 4 g/dm3...     

The Deposition Mechanism and Protective Properties of Manganese-Based Conversion Coatings on the Surface of AD31 Aluminum Alloy

Protection of Metals and Physical Chemistry of Surfaces - The stage mechanism of manganese-containing conversion coatings (MCCs) formation on the surface of AD31 alloy (AA6063) in acidic (pH 3)...     

Modeling and fabrication of three-dimensional silicon substrates with tailored shape and microtopography parameters for CdTe films

Seven models were constructed for the surface of three-dimensional silicon substrates. We proposed models of upright and inverted pyramids (and frusta) and models of substrates with triangular and prismatic cross sections. In modeling, we took into account the capabilities of photolithography and anisotropic etching of silicon wafers. We modeled the light ray trajectory in a thin-film three-dimensional CdS/CdTe solar cell with a large surface area. Three-dimensional microtextured substrates were fabricated using photomasks and modeling and calculation results. Their surface morphology was studied by scanning electron microscopy. The elemental composition of the microtextured silicon substrates was determined.     

A study of the local electronic and atomic structure in <Emphasis Type="Italic">a</Emphasis>-Si<Subscript>x</Subscript>C<Subscript>1−<Emphasis Type="Italic">x</Emphasis></Subscript> amorphous alloys using ultrasoft X-ray emission spectroscopy

X-ray spectroscopy has been used to obtain data on the local electronic and atomic structure of a-Si_xC_1?x:H(Er) alloys produced by plasma-enhanced chemical vapor deposition (PECVD) with various relative amounts of silane and methane in the gas mixture (x=0.3–0.9). It is shown that the alloys contain silicon and carbon atoms in different coordination environments. Silicon is observed as elementary amorphous silicon and silicon carbide, and the relative amounts of these phases in the films depend on the composition of the gas mixture. Carbon atoms can form bonds with silicon in a coordination close to that found in crystalline silicon carbide, with a noticeable amount of C-H bonds also appearing. In addition, carbon can form an elementary carbon phase with various coordination numbers characteristic of graphite and diamond in the film.