Materials Literature
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The liquid-crystal dimer 1'',7''-bis(4-cyanobiphenyl-4'-yl)heptane (CB7CB) exhibits two liquid-crystalline mesophases on cooling from the isotropic phase. The high-temperature phase is nematic; the identification and characterization of the other liquid-crystal phase is reported in this paper. It is concluded that the…
Understanding the thermal reduction of graphene oxide (GO) is important for graphene exfoliation, and chemical and morphological modifications. In this process, the role of trapped water and the evolution of oxygen during annealing are still not well-understood. To unravel the complex mechanisms leading to the removal…
Laboratory experiments and numerical modelling are conducted to investigate the effects of decoupled charge blasting on rock fragmentation efficiency. It is concluded that the gap between the explosive and the borehole wall in decoupled charge blasting decreases the peak of the shock wave, extends the action time, and…
We demonstrate a mechanical approach for manipulating surface chirality at nanoscopic length scales. We use an atomic-force microscope to scribe a step pattern, which is chiral in two dimensions, into a polymer-coated substrate, and control chiral strength by varying the steps' length-to-width ratio R . We determine t…
Abstract In this work, we have studied the resonance Raman spectra of 17 single‐wall carbon nanotube (SWNT) serpentines, using a 532 nm laser. Each serpentine consists of a series of straight, parallel, and regularly spaced segments, connected by alternating U ‐turns formed on top of crystalline miscut quartz. The int…
Dielectric properties of Au/Ba0.6Sr0.4TiO3/La1.1Sr0.9NiO4 (Au/BST/LSNO) thin film capacitors were investigated versus excitation frequency and dc bias voltage. At low frequencies, Au/BST/LSNO capacitors exhibited a usual positive tunability [i.e., C(0V) > C(V)], while an unexpected negative tunable behavior app…
In the present study, poly(ethylene glycol)- b -poly(ε-caprolactone) micelles loaded with etoposide (ETO) were formulated and further conjugated with pentapeptide Glu-Ile-Leu-Asp-Val (EILDV) to target α4β1 integrin receptor overexpressed on metastatic tumor cell. Using a distinct ratio of carboxyl-terminated poly(ethy…
In this chapter and to facilitate a direct comparison between the carrier density of a single graphene layer and that one inside the graphite structure, the carrier density per area will be used. This can be easily obtained multiplying n, the three dimensional carrier density, by the distance between graphene layers i…
Aiming at model systems with close-to-realistic transport properties, we have prepared and studied planar Au/TiO(2) thin-film model catalysts consisting of a thin mesoporous TiO(2) film of 200-400 nm thickness with Au nanoparticles, with a mean particle size of ~2 nm diameter, homogeneously distributed therein. The sy…
The dynamical approach is applied to ballistic transport in mesoscopic graphene samples of length $L$ and contact potential $U$. At times shorter than both relevant time scales, the flight time ${t}_{L}=L/{v}_{g}$ (${v}_{g}$ is Fermi velocity) and ${t}_{U}=\ensuremath{\hbar}/U$, the major effect of the electric field…
Vertically aligned, biaxially textured molybdenum nanorods were deposited using dc magnetron sputtering with glancing flux incidence (alpha = 85º with respect to the substrate normal) and a two-step substrate-rotation mode. These nanorods were identified with a body-centered cubic crystal structure. The formation of a…
The crystallization of a sputtered Sb(8)Te(3) film was examined in an X-ray powder diffraction experiment. An as-sputtered, amorphous Sb(8)Te(3) film crystallized during heating into a structure of Sb-Te homologous series modulated along the stacking direction. During heating the lattice parameters and the modulation…
Low-frequency Raman scattering due to acoustic phonons is studied for silicon nanostructures. The lineshapes of the first-order Raman active modes exhibit asymmetry. A tail is observed toward low frequency and high frequency for the optic mode and acoustic mode, respectively. The Raman lineshapes of these modes are de…
Time-dependent laser reflectometry measurements are presented as a means to rigorously characterize analyte diffusion dynamics of small molecules from mesoporous silicon (PSi) films for drug delivery and membrane physics applications. Calculations based on inclusion of a spatially and temporally dependent solute conce…
A densely packed colloidal suspension, called as a paste, remembers the direction of external mechanical fields, such as flow and vibration. When the pastes are dried, memories in pastes are visualized as macroscopically anisotropic crack patterns, such as lamellar, radial, ring and spiral. Here, we experimentally inv…
The influence of the surface structure and vibration mode on the resistivity of Cu films and the corresponding size effect are investigated. The temperature dependent conductivities of the films with different surface morphologies are calculated by the algorithm based upon the tight-binding linear muffin-tin orbital m…
We have studied the relaxation dynamics from the photo-induced state in the spin crossover complex [FeH 2 L 2-Me ](ClO 4 ) 2 by magnetic susceptibility and X-ray diffraction measurements. Just after turning off the laser irradiation, the photo-induced high-spin state immediately starts relaxing back to the low-spin st…
Abstract We propose here a significantly improved process for the preparation of a lactide‐clay intercalated mixture, which yields a high molecular weight (MW, M n ∼ 126,000 Da) poly( L ‐lactic acid) (PLLA) clay nanocomposite (PLACN) in short times of in situ ring opening polymerization (ROP). In situ ROP using such a…
The effect of W on the nanovoid formation in annealed amorphous Al2O3 was studied by transmission electron microscopy and molecular dynamics simulations. A comparison of the void formation behavior in electron-beam deposited Al2O3 (without W) and resistance-heating deposited Al2O3 (with 10 at. % W) revealed that W enh…
Monodispersed ferrite nanoparticles of Fe3O4, MnFe2O4, and CoFe2O4 (near to 10 nm), were synthesized by organometallic synthesis, showing the same homogeneous chemical, morphological, and crystalline characteristics. The study and correlation of the thermal relaxation processes were analyzed through static and dynamic…