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Effect of contact temperature rises during sliding on the wear resistance of Al-FeAl3 based Intermetallic composite Scientia Research LibraryJournal of Applied Chemistry2348 - 04082025131 Sanjay Srivastava1 pages : 14-34 1 In this paper, we have studied the wear and frictional properties of the Al-Fe composite materials. The composite materials with 6.23 and .2 % Fe was prepared by the liquid metallurgical method. XRD and SEM technique were used to study the morphological character of the as-cast composite materials and subsequent forged by pneumatic hammer to homogenize the structure of the material. The optical and SEM results showed homogeneous dispersion of iron particles in the matrix. A dry sliding wear tests of as cast and forged samples was conducted on pin-on-disc machine over wide ranges of applied load and sliding speed. To determine the wear mechanisms, the worn surfaces of the samples were examined by SEM. Debris and wear tracks have been studied in detail to analyze the surface effects during dry sliding and to correlate wear properties. Observations from the experiments showed that the wear mechanism is dominated by oxidative debris under low loads and sliding velocities and wear tracks were largely covered with a smooth oxide layer Keywords: Al-Fe composite, Liquid metallurgy, Wear rates, Coefficient of friction, Worn surface http://www.scientiaresearchlibrary.com/archive-abs.php?arc=909http://www.scientiaresearchlibrary.com/archive/Effect of contact temperature rises during sliding on the wear resistance of Al-FeAl3 based Intermetallic composite.pdf

Exciton states in Quasi - Zero - Dimensional Semiconductor Nanostruсtures: Theory Scientia Research LibraryJournal of Applied Chemistry2348 - 04082025131 Sergey I. Pokutnyi1 , Vladimir P. Dzyuba2 , Yuriy N. Kulchnin2 , Valentine A. Milichko 3 pages: 1-13 1 The review analyzes the results of theoretical investigations of excitons states (electron - hole pairs states) in a quasi - zero - dimensional nanosystems consisting of spherical semiconductor nanocrystals (quantum dots) placed in transparent dielectric matrices. The theory of exciton states in a quantum dot under conditions of dominating polarization interaction of an electron and a hole with a spherical (quantum dot dielectric matrix) interface are developed. An shown, that the energy spectrum of heavy hole in the valence band quantum dot is equivalent to the spectrum of hole carrying out oscillator vibrations in the adiabatic electron potential. In the framework of the dipole approximation theory are developed interband absorption of light in quasi zero dimensional nanosystems. An shown, that the absorption and emission edge of quantum dots is formed by two transitions of comparable intensity from different hole size quantization levels and into a lower electron size quantization level. Propose a theoretical prospect of using hole transitions between equidistant series of quantum levels observed in nanocrystals for desining a nanolaser. The theory of an exciton formed from spatially separated electron and hole (the hole is in the quantum dot volume, and the electron is localized at the outer spherical quantum dot dielectric matrix interface) is developed within the modified effective mass method. The effect of significantly increasing the exciton binding energy in quantum dots of zinc selenide, synthesized in a borosilicate glass matrix, relative to that in a zinc selenide single crystal is revealed. Keywords: excitons, energy spectrum, exciton binding energy, absorption of light, nanolaser. http://www.scientiaresearchlibrary.com/archive-abs.php?arc=910http://www.scientiaresearchlibrary.com/archive/Exciton states in Quasi - Zero - Dimensional Semiconductor Nanostruсtures Theory.pdf