Materials Literature
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Form follows mechanism: The nanoscale morphology of W/Mo oxides can be controlled through alkali chlorides as inorganic additives that shape the particles in a versatile and efficient manner. The mechanistic pathways leading to the different morphologies are investigated by in situ energy-dispersive X-ray diffraction…
We have investigated the effects of UV irradiation on the electrical and optical properties of polycrystalline In2O3 films. We found that UV illumination at a peak wavelength of 365 nm leads to a sharp drop in resistance and increase in carrier concentration. This highly conductive state persists for a timescale of ho…
Abstract Recent breakthroughs in low‐dimensional nanostructures have led to a renewal of interest in polymers composed of platinum complexes. The surge of research into one‐dimensional platinum complexes in the 1970s and 1980s has given way to a steady progression of investigations that have explored new ligands, char…
Phase-change materials are functionally important materials that can be thermally interconverted between metallic (crystalline) and semiconducting (amorphous) phases on a very short time scale. Although the interconversion appears to involve a change in local atomic coordination numbers, the electronic basis for this…
An extensive study of the one-dimensional two-segment Frenkel-Kontorova (FK) model reveals a transition from the counterintuitive existence to the ordinary nonexistence of a negative-differential-thermal-resistance (NDTR) regime, when the system size or the intersegment coupling constant increases to a critical value.…
Abstract Ammonia borane (AB, NH 3 · BH 3 ) was activated selectively on the boron hydrogen atoms by [Ir(dppm) 2 ]OTf, as shown by variable‐temperature 31 P, 11 B and 1 H NMR studies, to yield cis ‐ and trans ‐[Ir(H) 2 (dppm) 2 ]OTf dihydrides. X‐ray crystal structures of these complexes were obtained. DFT calculations…
Photoactive micelles of a diblock copolymer composed of poly(ethylene oxide) and poly(7-(2-methacryloyloxyethoxy)-4-methylcoumarin) (PEO-b-PCMA) were layer-by-layer assembled with poly(acrylic acid) (PAA) using hydrogen-bonding between the PEO corona of the micelles and the PAA chains (pH < 3). In addition to characte…
Phase transition and pyroelectric behaviors of Pb0.955La0.03(Zr0.42Sn0.40Ti0.18)O3 (PLZST) ceramics were investigated as functions of temperature and electric field. Pyroelectric coefficient about 160×10−8 C cm−2 K−1 is detected at the electric-field-induce ferroelectric (FEIN) to antiferroelectric phase transition fo…
One-dimensional (1D) chainlike arrays of hollow magnetic Fe 3 O 4 spheres have been prepared by simply aging magnetically preassembled Fe nanoparticles in aqueous solution at room temperature. The diameter of the 1D nanomaterials is about 100−200 nm, and the length is up to 1−3 μm, observed by scanning electron micros…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation E. Dul'kin, E. Mojaev, M. Roth, I. P. Raevski, S. A. Prosandeev; Nature of thermally stimulated a…
The objective of this study was to fabricate biomatrix/polymer hybrid heart valve leaflet scaffolds using an electrospinning technique and seeded by mesenchymal stem cells. Mesenchymal stem cells were obtained from rats. Porcine aortic heart valve leaflets were decellularized, coated with basic fibroblast growth facto…
Ketoprofen (KTP) is an anti-inflammatory drug widely used in therapeutics. By using the van’t Hoff and Gibbs equations, the thermodynamic functions Gibbs energy, enthalpy, and entropy of solution and mixing for KTP in ethanol (EtOH) + water cosolvent mixtures were evaluated from solubility data determined at several t…
One-dimensional BaTiO3 nanostructures have been synthesized by a simple hydrothermal ion-exchange reaction using alkali-metal titanates as synthetic precursors. The BaTiO3 nanowires obtained from Na2Ti3O7 nanowires have diameters of 50–80 nm and lengths of up to 10 μm. In contrast, BaTiO3 nanowires obtained from K2Ti4…
The magic-size clusters (MSCs) of semiconductor nanocrystals (NCs) have attracted much attention the last few years. In this work, we studied the synthesis of CdS NCs in a liquid-paraffin/glycerol biphasic system at different temperatures. The properties of a 323-nm-absorbing MSC species, an intermediate in the synthe…
Abstract Here, spontaneous lamellar alignment in a thickness‐modulated block copolymer film is presented as a facile, scalable, and general approach for creating a highly aligned lamellar morphology. Thickness‐modulated block copolymer films are prepared on neutral surfaces by various methods, such as solution droppin…
Macroporous GaP photoelectrodes with wall thicknesses of approximately 500 nm and pore depths ranging from 0 to 45 μm have been prepared from nondegenerately doped single-crystalline n-GaP(100) with a minority-carrier diffusion length of only 110 nm. The photoelectrochemical behaviors of planar and macroporous photoel…
To study the effect of stress concentration at the nanoscale, we performed fracture experiments on single edge notched thin film specimens inside the transmission electron microscope. Even at about 4 GPa stress at the notch tip, the specimens failed far away from the notch at places with no apparent stress concentrati…
Using first-principles calculations, we investigate the role of hydrogen in the passivation of Al, Ga, and In acceptors in ${\text{SnO}}_{2}$. We find that interstitial hydrogen bonds to oxygen atoms next to the acceptor impurities and effectively neutralizes their electrical activities. Based on calculated binding en…
This article is concerned with the mathematical analysis of the Kohn–Sham and extended Kohn–Sham models, in the local density approximation (LDA) and generalized gradient approximation (GGA) frameworks. After recalling the mathematical derivation of the Kohn–Sham and extended Kohn–Sham LDA and GGA models from the Schr…
Gold nanorods emit strong photoluminescence under two photon excitation; the efficient two photon lumininescence (TPL) arises from the local field enhancement assisted by surface plasmons. The surface plasmon effects on the TPL efficiency and spectrum are investigated by measuring the TPL of gold nanorods with various…