Materials Literature
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In this communication, poly(lactic acid) nanofibers have been fabricated by electrospinning and then poly(lactic acid) (PLA) based nanocomposites have been prepared by accumulating anticancer drug daunorubicin on PLA nanofibers combined with TiO2 nanoparticles. Our atomic force microscopy (AFM) and laser-scanning conf…
A silicon-based optoelectronic device that exhibits an enhanced response to subbandgap light is described. The device structure consists of a bifacial silicon solar cell with an up- converting (UC) layer attached to the rear. Erbium-doped sodium yttrium fluoride (NaY0.8F4: Er0.23+) phosphors are the optically active c…
Abstract Investigations on electric conductivity have been performed on polycarbonate (PC) containing 0.6 vol% of multi‐walled carbon nanotubes (MWNT) in a rheometer, where the plates act as capacitor plates for dielectric spectroscopy. The time dependent recovery of the DC‐conductivity was recorded in the rest time a…
( K 0.44 − x Na 0.52 Li 0.04 Ag x ) ( Nb 0.91 Ta 0.05 Sb 0.04 ) O 3 lead-free piezoelectric ceramics were prepared by normal sintering. The effects of Ag content on the phase structure and piezoelectric properties of the ceramics were mainly studied. These results show that the phase structure undergoes a transition f…
We present a detailed analysis of the bounds on the integration step in Discrete Element Method (DEM) for simulating collisions and shearing of granular assemblies. We show that, in the numerical scheme, the upper limit for the integration step, usually taken from the average time $t_c$ of one contact, is in fact not…
We have investigated the structure of cyclohexene-2-ethanamine molecule both theoretically and experimantally. Theoretical investigation is based on a first principle technique Density Functional Theory (DFT) using plane wave basis sets and ultrasoft pseudo-potentials while the experimental technique is infrared (IR)…
We investigated domain nucleation process in epitaxial Pb(Zr,Ti)O3 capacitors under a modified piezoresponse force microscope. We obtained domain evolution images during polarization switching process and observed that domain nucleation occurs at particular sites. This inhomogeneous nucleation process should play an i…
We present a quantitative theory of optical absorption polarized transverse to the tube axes in semiconducting single-walled carbon nanotubes. Within one-electron theory, transverse optical absorption occurs at an energy that is exactly in the middle of the two lowest longitudinal absorption energies. For nonzero Coul…
Marine and freshwater mussels are notorious foulers of natural and manmade surfaces, secreting specialized protein adhesives for rapid and durable attachment to wet substrates. Given the strong and water-resistant nature of mussel adhesive proteins, significant potential exists for mimicking their adhesive characteris…
Room temperature bright white upconversion (UC) luminescence in Yb3+–Tm3+–Er3+ ions doped Y2O3 nanocrystals was obtained under single-wavelength diode laser excitation of 976nm. The white light consists of the blue, green, and red UC radiations which correspond to the transitions G41→H63 of Tm3+, H11∕22∕S3∕24→I15∕24,…
Coupling between spin and lattice degrees of freedom are important in geometrically frustrated magnets where they can lead to degeneracy lifting and novel orders. We show that moderate spin-lattice couplings in triangular and Kagome antiferromagnets can induce complex colinear magnetic orders. When classical Heisenber…
The local structures of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mg}}_{x}\mathrm{O}$ alloys have been studied by Raman spectroscopy and by synchrotron x-ray pair-distribution-function (PDF) analysis. Within the solid solution range $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.15)$ of ${\mathrm{Zn}}_{1\ensuremath…
Using inverse statistical-mechanical optimization techniques, we have discovered isotropic pair interaction potentials with strongly repulsive cores that cause the tetrahedrally coordinated diamond and wurtzite lattices to stabilize, as evidenced by lattice sums, phonon spectra, positive-energy defects, and self-assem…
( K 0.5 Na 0.5 ) Nb O 3 (KNN) based lead-free materials exhibit arguably, comparable piezoelectric properties to conventional Pb(Zr,Ti)O3 ceramics owing to an orthorhombic to tetragonal polymorphic phase transition (TO-T) occurring near room temperature. However, this transition correspondingly results in a strong tem…
Reversible control of magnetism is reported for a Fe thin film in proximity of a $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ single crystal. Large magnetization changes emerge in response to ferroelectric switching and structural transitions of $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ controlled by applied electric field…
The Kirkendall effect is a consequence of the different diffusivities of atoms in a diffusion couple causing a supersaturation of lattice vacancies. This supersaturation may lead to a condensation of extra vacancies in the form of so-called "Kirkendall voids" close to the interface. On the macroscopic and micrometer s…
To develop a new drug delivery system, antibacterial 50–900 nm nanoparticles of shell and internal organs from scallops collected off Huksan-Island, Korea, were prepared by dry grind technology respectively. The diameters, identities, and conformations of the scallop shell and internal organ particles were determined…
The influence of extended duration (up to 1000 h), low temperature oxidation heat‐treatments (375°–600°C) has been assessed using a model ceramic matrix composite system with a graphitic fiber/matrix interphase. For this study a Nicalon ™ fiber reinforced CaO–Al 2 O 3 –SiO 2 matrix composite was selected (Nicalon ™ /C…
The adsorption states and dissociation process of oxygen on Cu(100) at 40 K were investigated using high-resolution electron energy loss spectroscopy. The dissociation of O 2 occurs on the bare Cu(100) surface via a mobile precursor at 40 K. This precursor was not observed as a stable intermediate. The chemisorption s…
Abstract Mesoporous silica and carbon with high surface area and large pore size were readily prepared in a dilute silica solution at pH ≈4.0–6.0 by using the biodegradable gelatin or gelatin–phenol–formaldehyde polymer blend as template.