Materials Literature
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The approximate representation of a quantum solid as an equivalent composite semi-classical solid is considered for insulating materials. The composite is comprised of point ions moving on a potential energy surface. In the classical bulk domain this potential energy is represented by pair potentials constructed to gi…
Abstract ZnO fibers are synthesized by hydrothermal method from Zn(OH)42− starting solution. The morphologies of obtained ZnO fibers are closely related to the hydrothermal treatment temperature and Zn2+/OH− ratio, and the bunch-like growth phenomenon is revealed by scanning electron microscopy (SEM) and transmission…
The macroscopic contact angle theta(m) of a liquid drop on a rough solid surface in the presence of a gas is calculated microscopically on the basis of a variational minimization of the total potential energy of the drop. Two limiting cases are considered: the liquid penetrates into the space between asperities (Wenze…
We investigated the adhesive properties of binary heterogeneous polymer brushes made from end-functionalized polystyrene (PS) and poly(2-vinylpyridine) (P2VP) chains. The molecular organization of the mixed brush could be varied reversibly by exposure to selective solvents for PS (toluene) and for P2VP (acidic water).…
Abstract Natural α-, β-, and γ-cyclodextrins (CDs) were intercalated in the interlayer of layered double hydroxide (LDH) by calcination–rehydration reaction using the calcined precursor of Mg–Al/CO3/LDH. The intercalated amount was considerably large in spite of nonanionic macrocyclic molecule in the wide CD concentra…
Abstract First sample of VUV-excited intensely luminescent glass is successfully prepared using the leached sintered glass with impregnation of Tb3+ ions which is colorless, transparent and gives intense emission 5D4 → 7F5 at 543 nm under the 160 nm VUV excitation.
A new preparation method for porous silica particles was developed using activated silica sols which are called nano-silica solutions in this paper. Several kinds of organic and inorganic acids are employed to neutralize diluted sodium silicate solutions to form the nano-silica solutions: formic acid, acetic acid, pro…
The combined application of HREM, HAADF STEM, and computer simulation techniques has proved to be a powerful tool for characterizing the structural modifications induced on ceria−zirconia mixed oxides by different thermochemical aging pretreatments. This is key information for better understanding the reversible chang…
Anticipation is rising that nanotechnology will bring great advances in diagnosing and treating disease1, 2, 3, 4, 5, 6, 7. But what is nanomedicine? Agreement on definition challenges even those working in the field. But recently the European Science Foundation's Forward Look on Nanomedicine defined it as “the scienc…
Insulator-metal transitions are translations characterized by a sudden change in electron transport properties from localized to itinerant behavior of electrons. In most cases, it is detected in strongly disordered semiconductors as a function of temperature with statistically distributed donors and/or acceptors. Here…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTReal-Time Neutron Scattering Study of Transient Phases in Polymer CrystallizationXiangbing Zeng, Goran Ungar, Stephen J. Spells, and Stephen M. KingView Author Information Department of Engineering Materials, University of Sheffield, Sh…
Using wide-angle X-ray scattering, we show that diblock copolymers with one crystallizable block can be oriented by crystallization in a strong magnetic field ( B = 7 T). The resulting structure consists of a stack of alternating crystalline and amorphous layers of different chemical compositions with the layer normal…
The uptake of carbon dioxide on N-(2-aminoethyl)-3-aminopropyltrimethoxysilane 1 and N-(6-aminohexyl)-3-aminopropyltrimethoxysilane 2 afforded a supramolecular network of bis-silylated ammonium carbamate salts, the hydrolytic polycondensation of which gave rise to structured hybrid materials. Subsequent loss of CO2 wa…
Binary hydrogen-bonded supramolecular polymers composed of a dimeric melamine (bis(melamine)) and barbiturate-type merocyanine dyes are prepared in aliphatic solvents. Macroscopic structure and rheological behavior of the supramolecular polymers are investigated by scanning electron microscopic observation and dynamic…
Neutron reflectivity (NR) is used to probe the solid, liquid, vapor interface of a porous superhydrophobic (SH) surface submerged in water. A low-temperature, low-pressure technique was used to prepare a rough, highly porous organosilica aerogel-like film. UV/ozone treatments were used to control the surface coverage…
We report here on the effects that the solution properties of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers have on the reduction of hydrogen tetrachloroaurate(III) hydrate (HAuCl4.3H2O) and the size of gold nanoparticles produced. The amphiphilic block copolymer solution properties…
Significant progress has been made in the development of new agents against cancer and new delivery technologies. Proteomics and genomics continue to uncover molecular signatures that are unique to cancer. Yet, the major challenge remains in targeting and selectively killing cancer cells while affecting as few healthy…
The syntheses of two nanoporous nickel phosphates, VSB-1 and VSB-5, have been investigated to elucidate the effect of various synthesis parameters such as pH, type of base, reaction time, and heating method. The pH is found to be the most important factor to direct the structure in the synthesis. These molecular sieve…
Calculations with Gaussian orbitals and periodic boundary conditions using several density functionals are carried out to study the proton-doping of polyaniline. We explore previously proposed mechanisms to explain the spectacular increase of the electrical conductivity of polyaniline upon protonation. The structural…
In situ growth of ZnO nanobelt arrays from and on zinc substrates (foils and microparticles) has been accomplished by controlled thermal oxidation in the presence of oxygen. The nanobelts grow approximately perpendicular to the Zn substrate surface along the 110 direction of ZnO, which has a thickness of approximately…