Materials Literature
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Carbon nanotubes (CNTs) have been known since 1976,1 and single-walled carbon nanotubes since 1993.2 However, the observation of “helical microtubules of graphitic carbon” by electron microscopy, reported by Sumio Iijima from the Japanese electronic company NEC in a 1991 publication in Nature,3 signaled the birth of a…
In the last 40 years, low energy electron diffraction (LEED) has proved to be the most reliable quantitative technique for surface structural determination. In this review, recent developments related to the theory that gives support to LEED structural determination are discussed under a critical analysis of the main…
The use of silver in commercial products has proliferated in recent years owing to its antibacterial properties. Food containers impregnated with micro-sized silver promise long food life, but there is some concern because silver can leach out of the plastic and into the stored food. This laboratory experiment gives s…
We study numerically the early stage domain coarsening dynamics of the temperature driven isotropic-nematic (I-N) liquid crystal phase transition. System of rod like objects which interact via the modified Lebwohl-Lasher pairwise interaction is considered in 3D. The coarsening dynamics is followed using Brownian molec…
In sample-scanning Laue microdiffraction, the local crystal orientation and local deviatoric strain tensor are obtained by illuminating the polycrystalline sample with a broadband `white' (5–30 keV) X-ray microbeam and analyzing the spot positions in the resulting local Laue pattern. Mapping local hydrostatic strain i…
Abstract A kind of semiaromatic polyamide, poly(dodecamethylene terephthalamide) (PA12T) was synthesized via a polycondensation reaction of terephthalic acid and 1,12‐dodecanediamine. The structure of prepared PA12T was characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance ( 1 H‐N…
We report graphite-free laser etching of diamond surfaces using 266 nm laser pulses for a wide range of incident fluences below the threshold for ablation. The etching rate is proportional to the (fluence)x where x = 1.88 ± 0.16 over the range 10−6 - 10−2 nm per pulse for incident pulse fluences 1 – 60 J/cm2. Surface…
The synthesis and characterization of gold nanoparticles (AuNPs-1) stabilized by a novel bifunctional thiolate organometallic complex containing Pt(II) centers, that is, trans, trans -[(CH 3 COS)(PBu 3 ) 2 Pt–C≡C–C 6 H 4 –C 6 H 4 –C≡C–Pt(PBu 3 ) 2 (SCOCH 3 )] (complex 1), has been carried out. As a comparison, gold na…
This study reports on the linear dichroism in angular-resolved photoemission from the valence band of the Heusler compounds NiTi0.9Sc0.1Sn and NiMnSb. High-resolution photoelectron spectroscopy was performed with an excitation energy of hν = 7.938 keV. The linear polarization of the photons was changed using an in-vac…
Density functional perturbation theory, combined with quasi-harmonic approximation theory and the Debye theory, has been used to calculate the thermal conductivity of the double-perovskite perovskite slab--rocksalt layer oxide compounds ${L}_{2}$SrAl${}_{2}$O${}_{7}$ ($L$ $=$ La, Nd, Sm, Eu, Gd, and Dy), a promising c…
Ferroelectric properties of Dy and Mn codoped BiFeO 3 , ( Bi 1‐ x Dy x )( Fe 1‐ x Mn x ) O 3 ( BDFM ‐ x , x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10), thin films were investigated. Improved ferroelectric properties were observed in the codoped thin film capacitors. Among them, BDFM ‐0.08 thin film capacitor exhibited the…
We use time-resolved Faraday rotation spectroscopy to probe the electron spin dynamics in ZnO and magnetically doped Zn(1-x)Co(x)O sol-gel thin films. In undoped ZnO, we observe an anomalous temperature dependence of the ensemble spin dephasing time T(2), i.e., longer coherence times at higher temperatures, reaching T…
Chain-density gradients of poly(l-lysine)-graft-dextran (PLL-g-dex), a synthetic comblike copolymer with a poly(l-lysine) backbone grafted with dextran side chains, were fabricated on an oxidized silicon substrate. The influence of the changing dextran chain density along the gradient on the local coefficient of frict…
CeO 2 nanocubes, truncated nanocubes, and truncated octahedra were synthesized for the preparation of long-range ordered self-assembly multilayered nanostructure. The multilayer of CeO 2 nanocrystals was prepared on a rapid enlarged liquid–gas interface with a high concentration of surfactant in the dispersion. The st…
A non-covalent double-decker binding strategy is employed to construct functional supramolecular single-wall carbon nanotubes (SWCNT)-tetrapyrrole hybrids capable of undergoing photoinduced electron transfer and performing direct conversion of light into electricity. To accomplish this, two semiconducting SWCNTs of di…
In this article, the syntheses and optical properties of core/shell quantum dot (CdSe/ZnS) and their applications are reviewed. Nevertheless, the main focus is to provide an overview on biological applications of quantum dots that contain imaging, targeting, and sensing. We discuss the different synthetic methods, opt…
The Ce 3+ ‐doped Y 2 O 3 –Al 2 O 3 –SiO 2 ( YAS ) bulk glasses with low SiO 2 (≤40 mol%) were prepared by flame spray‐quench method and hot press sintering. YAG nanoglass‐ceramics were derived from YAS bulk glass by a controlled crystallization. The differential thermal analysis ( DTA ) results showed that the glass‐f…
In this work, films of horizontally aligned single-walled carbon nanotubes were thermally and electrically characterized in order to determine the bolometric performance. An average thermal time constant of τ = 420 μs along with a temperature coefficient of resistance of TCR = -2.94% K(-1) were obtained. The maximum v…
Broadband dielectric spectroscopy (10(3) to 1.8 × 10(9) Hz) and specific heat measurements have been performed on the odd nonsymmetric liquid crystal dimer α-(4-cyanobiphenyl-4'-oxy)-ω-(1-pyreniminebenzylidene-4'-oxy)undecane (CBO11O·Py), as a function of temperature. The mesogenic behavior is restricted to a nematic…
Controlled silver release from cellulosic nanocomposites was achieved by synthesizing silver nanoparticles, under microwave heating for 1-15 min, in a one-pot, versatile and sustainable process in which microcrystalline cellulose simultaneously functions as reducing, stabilizing and supporting agent in water; chitin,…