Materials Literature
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Nonequilibrium carrier dynamics in single exfoliated graphene layers on muscovite substrates are studied by ultrafast optical pump-probe spectroscopy and compared with microscopic theory. The very high 10-fs-time resolution allows for mapping the ultrafast carrier equilibration into a quasi-Fermi distribution and the…
Electrospinning technique is the main method of preparing polymer nanofiber simply, directly and continuously at present. In this work, electrospinning blend solution was prepared by in-situ polymerization using acid-modified multi-walled carbon nanotubes (MWNTs), m-phenylenediamine (MPD) and isophthaloyl chloride (IP…
The progress in studying the interfacial electronic structures of the developing new class of hybrid organic/inorganic material systems have envisaged a new dimension into the field of photovoltaics, which could be of great help in understanding the nature of charge transfer in them. In this regard, electropolymerizat…
TiO${}_{x}$ clusters on atomically flat Au(111) films have been investigated by means of scanning tunneling microscopy and scanning tunneling spectroscopy. We present measurements of both the morphology and the electronic properties of these clusters. First, pure Ti clusters are produced in the gas phase and are depos…
In this work, cage-like ZrO2 and hollow ZrO2 microspheres with high surface area and strong adsorption capability were successfully synthesized by microwave- ethanol-thermal method using yeasts as bio-template. XRD, SEM, EDS and BET were used to characterize the products. The results show that these micropheres have a…
The authors present the first reported use of vertically oriented titanium oxide nanotube/polypyrrole (PPy) nanocomposites to increase the specific capacitance of TiO2 based energy storage devices. To increase their electrical storage capacity, titanium oxide nanotubes were coated with PPy and their morphologies were…
Carbon nanofibers (CNFs) are considered ideal materials for reinforcing polymers due to their excellent mechanical properties, among others. In order to obtain composites of optimal properties the clue is to enhance the interaction between reinforcement (CNFs) and polymer matrix. Surface modification of CNFs with sila…
Abstract Azobenzene (AB) undergoes ( E ) → ( Z ) isomerization upon exposure to light. Whereas the light‐induced structural change can be exploited for numerous applications, a second, light‐orthogonal switch would facilitate the development of new uses for AB derivatives. Electron‐donating groups on the AB ring syste…
This work shows an analytical and experimental technique for characterizing radial heat flow present in integrated circuits (ICs) when power is dissipated by integrated devices. The analytical model comes from the resolution of the Fermat equation for the trajectory of rays and supposing a spherical heat source dissip…
Abstract— The chiral molecule D(L)‐Limonene was used to induce thermotropic cholesteric‐liquid‐crystal phases. A description of the methods used to identify and characterize the chiral nematic phase and its features will be given. D‐Limonene was substituted for conventional synthesized chiral dopants in a twisted‐nema…
In this work, the effect of multiwalled carbon nanotubes on the properties of a unique, low viscosity bisphenol E cyanate ester (BECy) resin is characterized during various stages of nanocomposite preparation. The effect of surface functionalization, with nanotubes containing hydroxyl groups (OH CNTs) and carboxylic a…
We investigate the effect of functional groups of pyrene molecules on the electrical sensing performance of single-walled carbon nanotubes (SWNTs) based DNA biosensor, in which pyrenes with three different functional groups of carboxylic acid (Py-COOH), aldehyde (Py-CHO) and amine (Py-NH2) are used as linker molecules…
The electronic and magnetic structures in the normal and superconducting states of iron pnictides are investigated by solving self-consistently the Bogoliubov--de Gennes equation. It is shown that strong electron correlations can induce domain walls, which separate the regions with different spin density wave orders.…
In this research, thermogravimetric analysis (TGA) was used to measure the amount and rate of change in the weight (weight loss) of abaca fibre reinforced high impact polystyrene (HIPS) composites as a function of temperature. The function determined the composition of abaca fibre reinforced HIPS composites on predict…
Mesoporous Co3O4 particles are prepared by using mesoporous silica KIT-6 (with double gyroid Ia-3d symmetry) as a hard-template and Co(No3)2 x 6H2O as an inorganic precursor. In the former section, we investigate the effect of the calcination temperatures at which the Co salts are converted into Co3O4 inside the mesop…
First-principles pseudopotential calculations are employed to study the structural stability, electronic, and magnetic properties of bulk, free chain, free (100) and (110) surfaces, and narrow [001] nanowires of MnSe in the rock-salt structure. The bulk computations reveal underestimation of the Mn 3$d$ spin exchange…
We study the effect of quenched size polydispersity on the phase behavior of charged colloidal suspensions using free-energy calculations in Monte Carlo simulations. The colloids are assumed to interact with a hard-core repulsive Yukawa (screened-Coulomb) interaction with constant surface potential, so that the partic…
Abstract The structural phase transition of CdSe/ZnS core/shell quantum dots (QDs) has been studied by in situ angle‐dispersive X‐ray diffraction under high pressure up to 53.6 GPa. The CdSe core transforms from wurtzite to rock‐salt structure near 6.3 GPa and then to Cmcm or distorted Cmcm structure probably occurs a…
Abstract A novel antistatic agent poly(ether‐ester‐amide) (PEEA) based on caprolactam, polyethylene glycol, and 6‐aminocaproic acid was successfully synthesized by melting polycondensation. The structure, thermal properties, and antistatic ability of the copolymer were characterized by Fourier transform infrared spect…
Abstract We prepared biocomposite gel dispersions involving sodium alginate (Na‐Alg) and calcium bentonite (Ca‐B) with various solid concentrations and characterized their rheological, electrokinetic, and morphological properties. The flow properties, such as the apparent and plastic viscosities, shear stress, and yie…