Materials Literature
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The presence of dynamical heterogeneities, i.e. nanometer-scale regions containing molecules rearranging cooperatively at very different rates compared to the bulk, is increasingly being recognized as crucial in our understanding of the glass transition, from the non-exponential nature of relaxation, to the divergence…
Ultrathin gold films prepared by evaporation of sub-percolation layers (typically up to 10 nm nominal thickness) onto transparent substrates form arrays of well-defined metal islands. Such films display a characteristic surface plasmon (SP) absorption band, conveniently measured by transmission spectroscopy. The SP ba…
Thin films of a nearly symmetric lamellae-forming diblock copolymer of poly(styrene- b -methyl methacrylate) (PS- b -PMMA) having a bulk repeat period, L O, were directed to assemble vertically away from chemically nanopatterned striped substrates (having a periodicity L S ) that consisted of alternating stripes that…
The electronic and optical properties of self-assembled InN/GaN quantum dots (QDs) are investigated by means of a tight-binding model combined with configuration interaction calculations. Tight-binding single particle wave functions are used as a basis for computing Coulomb and dipole matrix elements. Within this fram…
α- and β-Ni(OH) 2 with three-dimensional (3D) nanostructures were synthesized in a water-in-oil reverse micelle/microemulsion system. The form and shape of Ni(OH) 2 can be readily tuned by adjusting experimental parameters of the reverse micelle/microemulsion system. α-Ni(OH) 2 with dandelion-like nanostructures was o…
We investigate theoretically the ground state of the FeMn binary alloy monolayer on the W(001) surface, the stability of different magnetic configurations (ferro/antiferromagnetic, disordered local moments, etc.) and estimate concentrations at which a transition occurs between different magnetic orders. The tight-bind…
With the continuing development of bottom-up nanotechnology fabrication processes, spot welding can play a role similar to its macro counterpart for the interconnection of nano building blocks for the assembly of nanoelectronics and nanoelectromechanical systems (NEMS). Spot welding using single-crystalline copper-fil…
We report six phases of high-density nano-ice predicted to form within carbon nanotubes (CNTs) at high pressure. High-density nano-ice self-assembled within smaller-diameter CNT (17,0) exhibits a double-walled helical structure where the outer wall consists of four double-stranded helixes, which resemble a DNA double…
Inorganic colloidal particles which are in situ hydrophobized upon adsorption of short-chain amphiphilic molecules can be used as foam stabilizers. In this study, we tailor the microstructure of particle-stabilized wet foams, namely, the foam air content, average bubble size, and bubble size distribution, by changing…
The collision consistency between the BGK collision model equation and lattice-BGK (LBGK) model is proposed by researching the physical significance of the relaxation factor tau in LBGK model. For microscalar flow in which the continuum hypothesis is not still satisfied, the collision consistency tau=1.0 should be ens…
We show extensive theoretical studies related to the generation and characterization of 2D and 3D ordered networks using 1D units that are connected covalently. We experimentally created multi-terminal junctions containing 1D carbon blocks in order to study the most common morphologies and branched structures that cou…
The solvated ion size of electrolytes increases in the following order; SO 4 2- (H 2 O) 12 (0.53 nm) < (C 2 H 5 ) 4 N + ·7acetonitrile (Et 4 N + ·7ACN, 1.30 nm) < (C 2 H 5 ) 4 N + ·4propylene carbonate (Et 4 N + ·4PC, 1.35 nm). The size difference between the nanowindows of single-wall carbon nanohorns and the solvate…
Nanocrystalline particles of ZnO and TiO 2 of approximately equal size (∼15 nm) were used to prepare mesoporous electrodes for dye-sensitized solar cells. Electron transport in the solar cells was studied using intensity-modulated photocurrent spectroscopy and revealed very similar results for ZnO and TiO 2 . Apparent…
The magnetoelectric behavior of $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ has been explored on the basis of accurate density functional calculations. We are able to predict structural, electronic, magnetic, and ferroelectric properties of $\mathrm{Bi}\mathrm{Fe}{\mathrm{O}}_{3}$ correctly without including any strong c…
Finely divided carbon particles, including charcoal, lampblack, and diamond particles, have been used for ornamental and official tattoos since ancient times. With the recent development in nanoscience and nanotechnology, carbon-based nanomaterials (e.g., fullerenes, nanotubes, nanodiamonds) attract a great deal of in…
The polarization of graphene is calculated exactly within the random phase approximation for arbitrary frequency, wavevector and doping. At finite doping, the static susceptibility saturates to a constant value for low momenta. At q = 2 k F it has a discontinuity only in the second derivative. In the presence of a cha…
Lithium borate (Li 2 B 4 O 7 ) and sodium borate (Na 2 B 4 O 7 ) mineralize spinel formation from stoichiometric MgO and Al 2 O 3 between 1000° and 1100°C. Mineralization with both compounds is shown to be mediated by B‐containing liquids which form glass on cooling. However, the liquid compositions depend on the type…
Novel aramid‐silica ceramers with increased inter‐phase bonding have been prepared via the sol‐gel process. The aramid chains with pendant alkoxy groups were synthesized by reacting poly(hyroxyaramid) chains with isocyanato‐propyltriethoxysilane (ICTOS). The sol‐gel process was carried out in this matrix after mixing…
Unit‐cell parameters of the α‐tricalcium phosphate [TCP; Ca 3 (PO 4 ) 2 ] were investigated using high‐resolution synchrotron powder diffraction and the Rietveld method. The diffraction experiment was conducted at 29°C at the BL‐15XU experimental station of SPring‐8, Japan. Precise unit‐cell parameters of the α‐TCP we…
High Resolution Image Download MS PowerPoint Slide We previously reported that highly dense multiwall carbon nanotubes (hd-MWNTs) with the innermost tube diameters of about 0.4 nm and outside diameters of 5−20 nm were obtained easily with yields higher than 90% by evaporation of graphite with radio frequency (RF) plas…