Materials Literature
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We present molecular dynamics (MD) simulations using a capacitance–polarizability force field. This force field allows an atomistic description of charge migration within a particle and hence the image charge effects at the interface of such a particle. By employing atomic capacitance and polarizability as the key par…
Time-dependent mechanical behavior of textiles has particular importance. One of such behaviors is the stress relaxation. If a fabric is under tension over a period of time, some of the stresses in it will be relieved. During the manufacture and application of clothing and footwear, materials experience various long-l…
The atomic structure and dynamics of silicon nanoclusters covalently bonded to graphene are studied using aberration-corrected transmission electron microscopy. We show that as the cluster size increases to 4-10 atoms, ordered crystalline cubic phases start to emerge. Anisotropic crystals are formed due to higher stab…
ABSTRACT Moisture may cause many detrimental effects to polymers and their composites, thus inhibiting the applications of polymeric materials in hot and humid environments. In this article, a convection–diffusion porous media model is derived to better characterize rapid moisture transport in polymer composites at hi…
A novel homologous series of 12 symmetrical dimers, viz. 1,1’-Bis[4-(4’-n-alkoxy benzoyloxy)-3-methyl phenyl] cyclohexanes is reported. Nematogenic mesophase commences from the heptyloxy homologue dimer and continues up to the hexadecyloxy dimer in an enantiotropic manner without the exhibition of any smectogenic beha…
A novel liquid crystal (LC) homologues series of ethylene derivatives was synthesized and evaluated for mesomorphic properties. Mesomorphism commences from sixth member of the series. Textures of the nematic phase are threaded or Schlieren and those of the smectic phase are of the focal conic fan type. The N-I and Sm-…
A novel homologous series of esters was synthesized and studied with a view to understanding and establishing the effects of molecular structure on liquid crystal (LC) properties. The series consists of 11 members, and all exhibit enantiotropically the smectogenic mesophase. The nematogenic mesophase is totally absent…
Ba0.5Sr0.5TiO3(BST) thin films were deposited on sapphire substrate by RF magnetron sputtering techniques and interdigital capacitor (IDC) structures were fabricated using photolithography. Gamma irradiation induced changes of the BST based tunable capacitor have been investigated under various doses from 0 kGy to 600…
The role of negative ions in the sputter deposition of oxides can be termed negative in the sense that they typically cause radiation-induced structural damage during film growth. For magnetron sputtered Al-doped ZnO (AZO) films, efforts have been made to alleviate the radiation damage by decreasing the discharge volt…
Mesoscale granular textures having a single-crystalline feature are widely observed on various biogenic and biomimetic calcite crystals, although the distribution of organic phases and the magnitude of lattice strain in the textured crystals vary with organism species or growth conditions of the biomimetic process. Th…
Metal-free octaethyl porphyrins and octaethyl zinc porphyrins were used to fabricate thin films via spin coating. The film quality was evaluated by ultraviolet-visible spectroscopy. Surface plasmon resonance was employed to characterize the thin films for sensing of volatile organic compounds. The metal-free porphyrin…
Manganese oxide nanowires have been prepared through the thermal decomposition of manganese oxalate hydrate precursor. The obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential thermal analysis (TG-DTA) and high-resolution transmission electr…
The recently postulated concept of "ultrastability" and "electron-deficient aromaticity" (Vach, Nano Lett 2011, 11, 5477; Vach, J Chem Theory Comput 2012, 8, 2088) in a sila-bi[6]prismane having an additional entrapped silicon atom, Si19 H12 , has been disproved on the basis of a careful analysis of the energetic char…
The reaction between Mn(OAc)2·4H2O and Br-saoH2 (=5-Br-salicylaldoxime) in EtOH in the presence of NMe4OH led to the formation of the hexanuclear cluster [Mn6O2(Br-sao)6(OAc)2(H2O)2(EtOH)2]·2.8H2O·2.2EtOH (1). Switching from Mn(OAc)2·4H2O to Mn(ClO4)2·6H2O, the same reaction upon addition of pivH (= trimethyl acetic a…
It was shown recently [J. L. Lado and J. Fern\'andez-Rossier, Phys. Rev. Lett. 113, 027203 (2014)] that edge magnetic moments in graphene-like nanoribbons are strongly influenced by the intrinsic spin-orbit interaction. Due to this interaction an anisotropy comes about which makes the in-plane arrangement of magnetic…
A focus point in this work was the study of the magnetic properties of Cr–Al–C in both bulk and film form. The coatings, deposited by high power impulse magnetron sputtering, consisted of a mixture of disordered solid solution (Cr,Al) 2 C x and ordered Cr 2 AlC-MAX phase (ternary alloy with general formula M n+1 AX n…
Metal monochalcogenide quantum dot nanocrystals of ZnS, CdS and SnS were prepared by anaerobic, metal-reducing bacteria using in situ capping by oleic acid or oleylamine. The capping agent preferentially adsorbs on the surface of the nanocrystal, suppressing the growth process in the early stages, thus leading to prod…
Few-layer graphene materials have been produced by decomposition of fluorinated graphite intercalated with acetonitrile (CH3CN) or isopropylamine ((CH3)2CHNH2) in the conditions of thermal shock. Electronic structure of the samples before and after exfoliation was studied using near-edge X-ray absorption fine structur…
The effect of Pb content and solution concentration of lead titanate (PbxTiO3) seed layer on the texture and electric properties of Pb1.1(Zr0.52,Ti0.48)O3 (PZT) thin films was investigated. A variety of seed layers (y PbxTiO3) with varying solution concentration (y = 0.02, 0.05, 0.1, and 0.2 M) and Pb content (x = 1.0…
We report a metallic planar lens based on the coupled nanoslits with variable widths for superfocusing. The influence of the interaction between two adjacent nanoslits on the phase delay is systematically investigated using the finite-difference time-domain (FDTD) method. Based on the geometrical optics and the wavefr…