Materials Literature
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We show that minimal disturbance to the robust charge-ordered ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3}$ by 2.5% Al substitution on the Mn site drives the system toward a ferromagnetic ground state. The history-dependent coexisting phases observed are explained as the outcome of a hindered fir…
The first example of monolayer-protected metal nanoparticles able to deliver nitric oxide upon visible light stimuli is reported. These hybrid nanosystems exhibit a combination of indispensable properties for biological applications, such as ultrasmall sizes (ca. 1 nm), water solubility and thermal stability under phy…
Femtosecond carrier relaxation dynamics in colloidal CdSe quantum dots are measured which focus on the early time dynamics for different initial excitonic states. Selecting the initial excitonic states produces a clear influence upon the early time dynamics. The difference between the dynamics when initially populatin…
PEG-containing copolymers play a prominent role as biomaterials for different applications ranging from drug delivery to tissue engineering. These custom-designed materials offer enormous possibilities to change the overall characteristics of biomaterials by improving their biocompatibility and solubility, as well as…
Bright green and red luminescence has been generated with a 980 nm diode laser from silica sol-gel thin films made with La0.45Yb0.50Er0.05F3 nanoparticles through a newly described hetero-looping-enhanced energy-transfer (hetero-LEET) up-conversion process, which exhibits a power dependence similar to that of a photon…
Bacterial cellulose (BC) was deposited in tubular form by fermenting Acetobacter xylinum on top of silicone tubes as an oxygenated support and by blowing different concentrations of oxygen, that is, 21% (air), 35%, 50%, and 100%. Mechanical properties such as burst pressure and tensile properties were evaluated for al…
We study theoretically the electric polarization induced by noncollinear spin configurations in the limit of strong Hund coupling. We employ a model of two magnetic ions sandwiching an oxygen ion. It is shown that there appears a longitudinal polarization ${P}_{x}$ along the bond, which is roughly proportional to ${({…
First-principle calculations are performed to investigate the structural, elastic, and electronic properties of $\mathrm{Re}{\mathrm{B}}_{2}$ and $\mathrm{W}{\mathrm{B}}_{2}$. The calculated equilibrium structural parameters of $\mathrm{Re}{\mathrm{B}}_{2}$ are consistent with the available experimental data. The calc…
Large strain plasticity is phenomenologically defined as the ability of a material to exhibit an exceptionally large deformation rate during mechanical deformation. It is a property that is well established for metals and alloys but is rarely observed for ceramic materials especially at low temperature ( approximately…
We propose a design strategy--based on the coupling of spins, optical phonons, and strain--for systems in which magnetic (electric) phase control can be achieved by an applied electric (magnetic) field. Using first-principles density-functional theory calculations, we present a realization of this strategy for the mag…
This paper describes the effect of halide ions during the seed-mediated growth of gold nanoparticles employing cetyltrimethylammonium bromide (CTAB) as a cationic surfactant system. With the addition of a small amount of iodide ion (∼20 μM) in a growth solution, the major product of the gold nanostructures formed were…
We report, for the first time, the synthesis of the high-quality p-type ZnO NWs using a simple chemical vapor deposition method, where phosphorus pentoxide has been used as the dopant source. Single-crystal phosphorus doped ZnO NWs have their growth axis along the 001 direction and form perfect vertical arrays on a-sa…
Mn2+-doped ZnSe quantum dots (Mn:ZnSe d-dots) with a tunable photoluminescence (PL) peak position were made to be water soluble by coating them with a monolayer of mercaptopropionic acid, a very short hydrophilic thiol. If the dopant centers were located close to the surface, thiol-coating partially quenched the PL. W…
We report a new strategy for the preparation of monodisperse, water-soluble magnetic nanoparticles. Oleic acid-stabilized magnetic nanocrystals were prepared by the organic synthesis route proposed by Sun et al. (J. Am. Chem. Soc. 2004, 126, 273.), with size control obtained via seeded-mediated growth. The oleic group…
We compute, from first principles, the frequency of the E(2g), Gamma phonon (Raman G band) of graphene, as a function of the charge doping. Calculations are done using (i) the adiabatic Born-Oppenheimer approximation and (ii) time-dependent perturbation theory to explore dynamic effects beyond this approximation. The…
The topological moment of disclinations structure was suggested as a local order parameter for the vitrescent system. The method, which is based on the scaling hypothesis and implies a hierarchy of the intervalleys relaxation times, has been suggested for the theoretical description of the glass transition. It is show…
In many applications of carbon nanotubes (CNT), it is desirable to have them embedded in a dielectric such as SiO(2), without significantly impacting their electronic properties. Here we investigate the CNT-SiO(2) interface of an embedded CNT using first-principles calculations. We show that strong Si-O-C bonds form,…
Using photoconduction techniques, we demonstrate that the low-temperature Ohmic conduction of o-TaS3 is not provided by band motion or hopping of single-particle excitations-electrons and holes excited over the Peierls gap. Instead, the low-temperature Ohmic conduction is mostly provided by collective excitations havi…
Electronic structure and intramolecular exchange constants are calculated for three cyanide-bridged molecular magnets, ${[T{p}^{\ensuremath{\star}}{\mathrm{Fe}}^{III}{(\mathrm{C}\mathrm{N})}_{3}{M}^{II}{(\mathrm{DMF})}_{4}]}_{2}{(\mathrm{O}Tf)}_{2}∙2\mathrm{DMF}$ $({M}^{II}=\mathrm{Mn},\mathrm{Co},\mathrm{Ni})$ (abbre…
Human overpopulation combined with the current lifestyle urges the rational, efficient and sustainable use of natural resources to produce environmentally friendly plastic materials such as polyhydroxyalkanoic acids (PHA), whose production/degradation cycle reduces undesirable wastes and emissions. In this issue Sabir…