Materials Literature
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The mechanical responses of carbon nanotubes (CNTs) under compressive and sliding forces are examined using classical molecular dynamics simulations. Several different types of nanotube systems are considered, including pristine single-walled tubes that are empty, filled with fullerenes to form nanopeapods, and filled…
Structural changes in ion-beam-irradiated rhombohedral Sc4Zr3O12 (δ-Sc4Zr3O12) have been examined using transmission electron microscopy (TEM). Polycrystalline δ-Sc4Zr3O12 samples were irradiated at cryogenic temperature with 300keV Kr2+ ions to a fluence of 3×1016 Kr∕cm2 (equivalent to a peak dose of ∼70 displacement…
The synthesis of 3-(2-methoxy-1,1-dimethylethyl)pyrazole, pz*H is described together with its reactions with the borohydrides MBH(4), where M = Li, Na, and K, under melt conditions. At 180 degrees C, this procedure leads to a mixture of products for M = Li, and at higher temperatures, a derivative LiTp'pz*H, 1, is iso…
In this paper, a one-dimensional bubble model of pulsed discharge in water is presented. With a total input energy of 0.63J, the simulation results show that when the bubble collapses at the center of the bubble, the plasma pressure oscillates strongly. It oscillates between 800 and 1150atm with an oscillation frequen…
A new procedure for the direct synthesis of metal complex hydrides, NaAlH 4 and LiAlH 4, has been developed through hydrogenation of their respective metal hydrides, NaH and LiH, with Al, both in the presence of a catalyst and in the presence of a liquid complexing agent. This procedure involves three steps: blending…
The solubility behavior of solid dispersions of two drugs with similar structures was studied. Valdecoxib (VLB) and etoricoxib (ETB) were used as model drugs, and their solid dispersions were prepared with 1, 2, 5, 10, 15, and 20% w/w poly(vinylpyrrolidone) (PVP) by the quench cooling method. The interactions between…
To improve integrated circuit performance, microelectronic chip interconnections need dielectric materials with ultralow k (ULK) values. Porous a-SiOCH, an ULK material, can be created using a two step strategy called a porogen approach. The first step consists of a hybrid film deposition, which is an a-SiOCH matrix c…
Mesoscopic simulations of linear and 3-arm star poly(styrene)-poly(isoprene) block copolymers was performed using a representation of the polymeric molecular structures by means of Gaussian models. The systems were represented by a group of spherical beads connected by harmonic springs; each bead corresponds to a segm…
A nano-sized CeO2 powder was synthesized by a modified glycine nitrate process (MGNP). The synthesized powder was characterized by X-ray diffraction (XRD), the Brunauer Emmett Teller (BET) method, and transmission electron microscopy (TEM). The lattice parameter and crystallite size were determined by the Rietveld ref…
Boron carbide powder was synthesized by sol-gel polycondensation of boric acid with citric acid. The starting materials of Serbian origin were dissolved in water and mixed homogeneously until a precomposite gel was formed, which was converted into cryogels after freeze-drying. Pyrolysing and subsequent heat treatment…
The effects of thermal annealing on Hall-effect measurement and photoluminescence (PL) from undoped n-type ZnO/GaAs thin-film samples have been studied. The evolutions of carrier concentration, electrical resistivity, and PL spectrum at various annealing conditions reveal that the dominant mechanism that affects the e…
A convergent growth approach for the synthesis of novel heterometallic dendritic molecules derived from carbosilane frameworks and functionalized with silicon-bridged ferrocenyl and (η 6 -aryl)tricarbonylchromium moieties has been developed. The synthetic route involves the construction of the dendritic fragments (CH…
CdS nanocomposites have been grown in a polymer (polyvinyl alcohol) matrix using a simple chemical bath deposition process. Transmission electron micrographs of nanocomposites grown at different solution temperatures revealed the formation of isolated as well as junctionlike structures. X-ray and selected area electro…
Magnetoelectric composite structures of CFO (CoFe2O4)-disk/PZT (Pb(Zr052Ti0.48)O3)-ring and PZT-disk/CFO-ring were prepared and evaluated, where the magnetostrictive and piezoelectric phases were coupled through normal stresses. Under bias magnetic fields around 3400 Oe, the peak magnetoelectric coefficients reached 1…
The modification of thermoluminescence (TL) and photoluminescence (PL) properties of K2Ca2(SO4)3:Eu nanoparticles by swift heavy ions (SHI), irradiation is studied. Pellets form of the nanomaterials were irradiated by 48 MeV Li3+, 75 MeV C6+, and 90 MeV O7+ ion beams. The fluence range is 1×109−1×1013 ions/cm2. The mo…
The origin of the blocking effects of the grain boundary on the electrical conduction in 1 mol % Sr-doped LaGaO 3 has been investigated. The oxygen partial pressure and the temperature dependences of the partial electronic and ionic conductivities of the grain boundary have been quantitatively analyzed based on the sp…
Energy-filtering transmission electron microscopy (EFTEM) analysis coupled with the technique of samples preparation, focused ion beam, was used to study physical, chemical, and mechanical properties of diamond-like carbon coatings (DLCs). Two different coatings (ta-C and a-C:H) were investigated, presenting different…
Carbon nanotubes (CNTs) inevitably contain defects that exert a significant influence on their physical, electrical, and electrochemical properties. In this study, we subject vertically aligned multiwalled CNT ensembles to argon and hydrogen ion irradiation, to artificially introduce defects into the structure. Subseq…
The structural and electronic properties of A2Hf2O7 (A=La and Gd) pyrochlore compounds are investigated by means of first-principles total energy calculations. Also, the formation energies of defects are calculated, and the results can be used to explain the stability of pyrochlores. Hybridizations between A 5p and O…
We determine the dependence of the interfacial conductance on twist angle for (001) symmetric twist grain boundaries (GBs) in diamond. We find that the conductances are extremely large, ranging from 7.7to17.6GW∕m2K. Nevertheless, when normalized to the single-crystal conductivity, the resulting Kapitza lengths are act…