Materials Literature
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Felted, curly, and straight β-SiC nanowires (SiCNWs) had been synthesized by chemical vapor reaction, and morphology-dependent field emission (FE) characteristics were chiefly investigated. The turn-on and threshold fields were 2.0 and 5.3 V/μm for felted nanowires, 1.5 and 3.25 V/μm for curly nanowires, and 1.0 and 2…
To prepare biomass-based composites in an environmentally benign manner, vapor-phase assisted surface polymerization (VASP) was applied to prepare the composites from wood flour and poly(l-lactic acid) (PLLA) without solvent. VASP of l,l-lactide successfully proceeded on the wood flour surfaces, resulting in surface c…
Abstract Telechelic thiopolymers were explored towards formation of doubly‐bound (polymer loops) vs. singly‐bound (polymer brushes) chains on gold substrates. The conformation, adsorption kinetics, and viscoelastic properties of the α , ω ‐dithiol and monothiol PS telechelics were investigated by means of XPS and QCM‐…
A simple but controllable way of altering the surface nature of carbon fibers, without sacrificing their intrinsic mechanical properties, is demonstrated using electron beam irradiation. Such treatment leads to physically improved roughness as well as chemically introduced hydrophilic oxygen-containing functional grou…
A label-free immunoassay based on a simple, surface-enhanced Raman scattering (SERS) approach is reported. Biotin-conjugated antibodies are attached to avidin-aggregated Ag nanoparticles via biotin–avidin biorecognition. More highly sensitive protein detection and more biocompatible protein adsorption are achieved c…
Rayleigh analysis has been used to investigate dielectric nonlinearity in epitaxial (001)-oriented BiFeO3 films with engineered domain structures from single- to four-variant and stripe domain samples with 71° and 109° domain walls. Single-domain variant films display minimal irreversible contributions, whereas the ra…
Gepresste Bi-Nanokristalle, die durch eine einfache Kolloidmethode erhalten wurden, zeigten sehr hohe elektrische Leitfähigkeiten von 104–105 S m−1 bei einer extrem niedrigen thermischen Leitfähigkeit von 0.35 W m−1 K−1. Die Synthesemethode kann für die kostengünstige Herstellung von hoch effizienten thermoelektrische…
The reaction of N(1),N(2)-bis(pyridin-4-ylmethylene)ethane-1,2-diamine (L) with Fe(NCS)(2) under various temperatures gave rise to three iron(II) coordination polymers, namely, one-dimensional [Fe(L')(NCS)(2)] (1), two-dimensional [Fe(L)(2)(NCS)(2)]·H(2)O (2), and one-dimensional [Fe(L)(2)(NCS)(2)]·2CH(2)Cl(2)·4MeOH (…
Switching amyloids by light: A light-switchable azobenzene peptide aggregates into amyloid-like structures when the azobenzene chromophore, incorporated as a backbone element, is in the trans form. The amyloids are disassembled by illumination which isomerizes the chromophore from trans to cis. The isomerized azobenze…
The ultrafast photoexcited electron and hole dynamics of CdSe quantum dots (QDs) deposited onto nanostructured TiO2 films were studied using an improved transient grating (TG) technique. By comparing the TG responses measured in air and in a Na2S solution (hole acceptor), we succeeded in separating the dynamic charact…
Abstract Chemical gradients of ethyl‐6‐bromohexanoate (EBH) were generated over porous silicon (pSi) substrates via electrochemical attachment. Immobilised ester moieties were hydrolysed and activated to produce a gradient of functional carboxylic acid groups. After subsequent immobilisation of cyclic RGD (cRGD), the…
X-ray diffraction and photoelectron spectroscopy of different Co-doped concentration GeTe have been made to identify the vacancies in rock-salt GeTe. The results show that Co occupies germanium vacancy and forms Co–Te bond, but the alloy retains a rock-salt structure when the concentration of doped Co is less than the…
Abstract Co@SiO 2 yolk‐shell nanostructures were fabricated on a gram scale by simple hydrogen reduction of CoO@SiO 2 core‐shell nanoparticles without using an etching step. The cobalt core diameters were reduced by the lattice volume contraction of CoO to Co, forming vacancy between the cores and the silica shells. T…
We present here the results of a powder neutron diffraction study on the (1−x)BiFeO3–xPbTiO3 (BF-xPT) system, which reveal an abrupt change in magnetic structure from a noncollinear antiferromagnetic one to a collinear G-type antiferromagnetic as the nuclear structure of the ferroelectric phase changes from monoclinic…
We report on the design of the nonlinear optical organic phenolic polyene crystals for tailoring their physical properties to achieve optimized crystals for applications. New phenolic OH2 (2-(3-(4-hydroxystyryl)-5-methylcyclohex-2-enylidene)malononitrile) molecules keep the main supramolecular interaction sites and th…
On the cover, a beam of broadband light hits a prism. Instead of typical dispersion and reflection from the prism, the reflection is almost totally suppressed and the light can be absorbed by the material of the prism if the surface has adequate nanotexture. The article on p. 122 by Lauri Sainiemi and co-workers descr…
We report the giant optical nonlinear absorption and refraction of Sb2Te3 phase change materials at low laser irradiation intensities. The nonlinear absorption and refraction coefficients reach up to −6.63×10−2 m/W and 2.606×10−9 m2/W, respectively. The first principles calculation indicates that the giant nonlinear a…
Abstract The role of grain boundary misorientation angles on the dislocation–grain boundary interactions was incorporated into a micro hardening scheme. The current formulation is applicable to both coarse‐ and ultrafine‐grained alloys, and evidences the experimentally observed dominant role of the misorientation angl…
The variation in the bulk modulus of semiconductor nanoparticles has been studied within first-principles electronic-structure calculations using the local density approximation (LDA) for the exchange correlation. Quantum Monte Carlo calculations carried out for a silicon nanocrystal ${\text{Si}}_{87}{\text{H}}_{76}$…
We report on the upper critical field B_c2 of a superconducting LiFeAs single crystal with T_c~16 K, determined from magnetic torque measurements in dc-magnetic fields up to 35 T and at temperatures down to 0.3 K. B_c2 at 0.3 K is obtained to be 26.4 T and 15.5 T for the applied field B_a||ab and B_a||c, respectively.…