Materials Literature
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Multiferroic BiFeO3 epitaxial films with thicknesses ranging from 40to960nm were grown by pulsed laser deposition on SrTiO3 (001) substrates with SrRuO3 bottom electrodes. X-ray characterization shows that the structure evolves from angularly distorted tetragonal with c∕a≈1.04 to more bulklike distorted rhombohedral (…
Previous studies from our group demonstrated visual evidence that endocytosis mechanism(s) contribute to the internalization and intracellular trafficking of cationic and anionic poly(amidoamine) (PAMAM) dendrimers across Caco-2 cells. These dendrimers colocalized with established endocytosis markers, which suggested…
A novel green-yellow emitting Mn2+-doped LiZnPO4 phosphor can be excited under ultraviolet and blue light. The phosphor will be an attractive candidate as an ascendant phosphor for potential applications in light emitting diodes.
The structure of graphene on Ni(111) is studied with density functional theory (DFT). Six different structures, i.e., top-fcc, top-hcp, hcp-fcc, bridge-top, bridge-fcc, and bridge-hcp, were investigated. Bridge-top, bridge-fcc, and bridge-hcp are studied here. Top-fcc and hcp-fcc have been considered before, experimen…
Well-defined gold nanobelts as well as unique gold nanocombs made of nanobelts were readily synthesized by the reduction of HAuCl4 with ascorbic acid in aqueous mixed solutions of the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium dodecylsulfonate (SDSn). Single-crystalline…
In this paper, physical concept and performance analysis of all-dielectric metamaterials are presented. Metamaterials with desired material parameters $(\ifmmode\pm\else\textpm\fi{}\ensuremath{\epsilon},\ifmmode\pm\else\textpm\fi{}\ensuremath{\mu})$ are developed by creating electric and magnetic resonant modes. Diele…
ZnS nanoparticles and nanorods with control over their crystal structure are fabricated through a solvothermal approach by changing the solvent used for the synthesis. The synthetic approach is suitable to fabricate ZnS nanoparticles with various sizes by varying the synthesis temperatures. Quantum confinement phenome…
Symmetry breaking at surfaces and interfaces and the capability to support large strain gradients in nanoscale systems enable unusual forms of electromechanical coupling. Here, we introduce the concept of electronic flexoelectricity, a phenomenon that is manifested when the mechanical deformation of nonpolar quantum s…
The synthesis of a variety of core functionalized PEGylated polyester dendrimers and their in vitro and in vivo properties are described in this report. These water-soluble dendrimers have been designed to carry eight functional groups on their dendritic core for a variety of biological applications such as drug deliv…
A mechanism that induces charge density variations in corrugated graphene is proposed. Here it is shown how the interplay between lattice deformations and exchange interactions can induce charge separation, i.e., puddles of electrons and holes, for realistic deformation values of the graphene sheet. The induced charge…
We have recently proposed a density functional scheme for calculating the ground-state pair density (PD) within the Jastrow wave function PDs of the lowest-order (LO-Jastrow PDs) [M. Higuchi and K. Higuchi, Phys. Rev. A \textbf{75}, 042510 (2007)]. However, there remained an arguable problem on the $N$-representabilit…
Multivesicle assemblies with pH-responsive transmembrane channels in the vesicle walls (see picture) were made by two-step double emulsion of copolymers comprising acrylic acid and acrylate of 1,2-distearoyl-rac-glycerol. These assemblies mimic eukaryotic cells, which contain functional organelles within the cell wall…
The reaction between fluorinated single-wall carbon nanotubes (F-SWNTs) and branched (M(w) = 600, 1800, 10000, and 25000 Da) or linear (M(w) = 25000 Da) polyethyleneimine (PEI) yields the covalent attachment of the polymer to the sidewalls of the nanotubes. The resulting PEI-functionalized SWNTs (PEI-SWNTs) were chara…
An interesting possibility to improve the conversion and cost efficiencies of photovoltaic solar cells is to exploit the large optical cross sections of localized (nanoparticle) surface plasmon resonances (LSPRs). We have investigated this prospect for dye sensitized solar cells. Photoconductivity measurements were pe…
The reaction of silver thiolates with Se(SiMe3)2 or S(SiMe3)2 in the presence of bidentate phosphanes leads to the formation of very large cluster molecules with distorted spherical metal–chalcogenide cores with diameters of 2–4 nm. The surfaces of these cores are protected by thiolate and phosphane ligands. Structura…
We observe an enhancement of fluorescence from a single fluorescent sphere, which is sandwiched between two individual gold nanoparticles, forming a hot spot of strong field enhancement. The fluorescence enhancing hot spot is custom-designed by the deliberate assembly of gold nanoparticles with an atomic force microsc…
Any labeling with multicolor markers can be affected by the autofluorescence of biological tissue due to the UV or blue light excitation sources, or the results are affected by fluorescence resonance energy transfer. In this work, we present novel IR-to-vis upconverting nanoparticles of different rare earth metal dopa…
This review focuses on the self-organization of organic–inorganic hybrid materials with molecular-scale and mesoscale periodicities. It describes organosilicas with molecular periodicity of organic units formed by self-organization of bissilylated organic monomers without employing templates, as well as porous organos…
This review aims to demonstrate the capability of the ice-segregation-induced self-assembly (ISISA) process for the preparation of materials with highly sophisticated structures (e.g., hierarchical materials exhibiting organization at different scale levels). Cryogenic processes (consisting of the freezing, storage in…
The conventional x-ray angiography (XRA) provides a gold standard for diagnosis of vascular diseases (1). However, this technique requires administration of a large volume of iodinated contrast media through arterial puncture and exposes patients to a significant dose of ionizing radiation. Magnetic resonance imaging…