Materials Literature
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The Midas touch: The low-temperature transformation of methanol to methyl formate, formaldehyde, and formic acid is promoted by atomic oxygen adsorbed on metallic gold (see picture). The reactions occur with O-containing Au nanoparticles formed on Au(111) upon oxidation with ozone at 200 K; the facile esterification t…
The effects of exposure of human dermal fibroblasts to rutile and anatase TiO(2) nanoparticles are reported. These particles can impair cell function, with the latter being more potent at producing damage. The exposure to nanoparticles decreases cell area, cell proliferation, mobility, and ability to contract collagen…
Nanofiber scaffolds of collagen have been fabricated via electrospinning using benign solvent systems as a replacement for 1,1,1,3,3,3 hexafluoro-2-propanol. Simple binary mixtures of phosphate-buffered saline and ethanol have been found to be highly effective for electrospinning. FTIR spectra suggest that the triple…
Abstract Aiming for a more practical route to highly stable visible photoluminescence (PL) from silicon, a novel approach to produce luminescent silicon nanoparticles (Si‐NPs) is developed. Single crystalline Si‐NPs are synthesized by pyrolysis of silane (SiH 4 ) in a microwave plasma reactor at very high production r…
The periodic makeup of carbon nanotubes suggests that their formation should obey the principles established for crystals. Nevertheless, this important connection remained elusive for decades and no theoretical regularities in the rates and product type distribution have been found. Here we contend that any nanotube c…
The glass transition is the freezing of a liquid into a solid state without evident structural order. Although glassy materials are well characterized experimentally, the existence of a phase transition into the glass state remains controversial. Here, we present numerical evidence for the existence of a novel first-o…
Organic solution-processable graphene sheets were prepared using a large-scale novel approach based on a transfer process assisted by ionic interactions. Smooth monolayer graphene sheets were easily fabricated on a substrate from organic solution. Such a noncovalent functionalization preserves the extended aromatic co…
The deposition process of calcium atoms on the rutile TiO 2 (110) surface has been investigated using first-principles methods based on density functional theory. It is found that calcium atoms adsorb on the surface by forming strong and directional bonds, and a large amount of charge is transferred to the surface. Th…
Epitaxial perovskite ${\text{PbMg}}_{1/3}{\text{Nb}}_{2/3}{\text{O}}_{3}$ films with different thickness (25--750 nm) and relaxed crystal structure are grown on ${\text{La}}_{0.5}{\text{Sr}}_{0.5}{\text{CoO}}_{3}/\text{MgO}$. The intrinsic low-frequency dielectric properties of the films are studied using experimental…
Hybrids of CdSe nanocrystals (3.7 nm) with two types of terthiophenes, namely (4,4′′-dioctyl-2,2′:5′,2′′-terthiophene-3′′-yl) acetic acid ( L1 ) and 7-(4,4′′-dioctyl-2,2′:5′,2′′-terthiophene-3′-yl) heptanoic acid ( L2 ), have been prepared via ligand exchange. Photoluminescence quenching studies showed that the effici…
In tissue engineering, coculture systems have been employed for two major purposes: (1) construction of tissue and organ substitutes (e.g., coculture of parenchymal and nonparenchymal cells in liver tissue engineering) and (2) maintenance of cellular functions (e.g., coculture of embryonic stem cells with embryonic fi…
The interaction between platinum nanoparticles and polypyrrole or poly(3,4-ethylenedioxythiophene) soluble in apolar solvents has been investigated. Regular and full monolayers and multilayers are produced via solution processing of platinum nanoparticles and poly(3,4-ethylenedioxythiophene). The new layered materials…
Hybrid-nanostructure Ag−Zn 0.92 Co 0.08 O dilute magnetic semiconductors synthesized by a solvothermal method show that the magnetic property of the nanorods is changed from paramagnetism to room-temperature ferromagnetism when 2% Ag is codoped into Zn 0.92 Co 0.08 O nanorods. The detailed analysis of the X-ray absorp…
Faceted stishovite nanocrystals with sizes of 200-400 nm were synthesized at a pressure of 12 GPa and a temperature of 400 degrees C in a multianvil apparatus using mesoporous silica SBA-16 as the precursor.
Abstract Uncompatibilized and compatibilized (polypropylene‐grafted maleic anhydride (PP‐ g ‐MA) as compatibilizer) PET (polyethylene terephthalate)/PP (polypropylene)/TiO 2 drawn strands were prepared by extrusion of the blends and cold drawing of the extrudates. In the uncompatibilized drawn strand, the generated PE…
Phase pure, epitaxial (101) rutile TiO2 films were grown on (012) sapphire substrates at temperatures between 485 and 725 °C using metal-organic molecular beam epitaxy with titanium tetraisopropoxide as the Ti source. Growth modes and rates were investigated as a function of substrate temperature using reflection high…
Abstract The electrical breakdown is investigated in high‐density polyethylene/graphite nanosheets (HDPE/GNs) conductive composites. A sample suffers electrical breakdown when the applied field exceeds the critical electrical breakdown field below which the sample reaches a stable state. It is found that the ratio of…
Squeezing very thin polymer layers can cause them to form polymer single crystals that could make plastic films less permeable to gases.
The solubility of valsartan in pure methyl acetate, n -butyl acetate, acetonitrile, N, N -dimethylformamide, dichloromethane, chloroform, and ethanol + water binary mixtures was measured by a synthetic method over the temperature range (278.15 to 313.15) K at atmospheric pressure. The results show that the solubility…
The bulk and local magnetisms of ∼10 nm diameter CoFe2O4 nanoparticles have been characterized from 5 to 425 K. Magnetometry results indicate that the nanoparticles have a blocking temperature around 380 K and they exhibit a temperature dependent cubic magnetocrystalline anisotropy similar to that of bulk CoFe2O4 with…