Browsing by Author "Khabashesku, Valery"

Now showing 1 - 3 of 3
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    Fracture toughness of the sidewall fluorinated carbon nanotube-epoxy interface
    (AIP Publishing LLC., 2014) Ganesan, Yogeeswaran; Salahshoor, Hossein; Peng, Cheng; Khabashesku, Valery; Zhang, Jiangnan; Cate, Avery; Rahbar, Nima; Lou, Jun
    The effects ofﾠcarbon nanotubeﾠ(CNT)ﾠsidewall fluorination on theﾠinterfaceﾠtoughness of theﾠCNTﾠepoxyﾠinterfaceﾠhave been comprehensively investigated. Nanoscale quantitative single-CNT pull-out experiments have been conducted on individual fluorinatedﾠCNTsﾠembedded in an epoxy matrix,ﾠin situ, within aﾠscanning electron microscopeﾠ(SEM)ﾠusing an InSEMﾮﾠnanoindenter assisted micro-device. Equations that were derived using a continuum fracture mechanics model have been applied to compute theﾠinterfacialﾠfracture energy values for the system. Theﾠinterfacialﾠfracture energy values have also been independently computed by modeling the fluorinated graphene-epoxyﾠinterfaceﾠusingﾠmolecular dynamics simulationsﾠandﾠadhesionﾠmechanisms have been proposed.
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    Nanoscale Engineering of Inorganic Composite Scintillation Materials
    (MDPI, 2021) Korzhik, Mikhail; Fedorov, Andrei; Dosovitskiy, Georgy; Anniyev, Toyli; Vasilyev, Maxim; Khabashesku, Valery
    This review article considers the latest developments in the field of inorganic scintillation materials. Modern trends in the improvement of inorganic scintillation materials are based on engineering their features at the nanoscale level. The essential challenges to the fundamental steps of the technology of inorganic glass, glass ceramics, and ceramic scintillation materials are discussed. The advantage of co-precipitation over the solid-state synthesis of the raw material compositions, particularly those which include high vapor components is described. Methods to improve the scintillation parameters of the glass to the level of single crystals are considered. The move to crystalline systems with the compositional disorder to improve their scintillation properties is justified both theoretically and practically. A benefit of the implementation of the discussed matters into the technology of well-known glass and crystalline scintillation materials is demonstrated.
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    Supported and Free-Standing Non-Noble Metal Nanoparticles and Their Catalytic Activity in Hydroconversion of Asphaltenes into Light Hydrocarbons
    (MDPI, 2024) Kustov, Leonid; Tarasov, Andrei; Kartavova, Kristina; Khabashesku, Valery; Kirichenko, Olga; Kapustin, Gennady; Kustov, Alexander; Abkhalimov, Evgeny; Ershov, Boris
    The hydroconversion of asphaltenes into light hydrocarbons catalyzed by supported and free-standing non-noble metal nanoparticles was studied. The activity of Ni or Co immobilized on microspherical oxide carriers and Co nanoparticles dispersed in a hydrocarbon solution of asphaltene was found to be higher than that of a comparative Pt-Pd/Al2O3 catalyst. The yield of light products (C5+) reached up to 91% on cobalt nanoparticles supported onto alumina microspheres.