Research in Macromolecular Science: Challenges and Opportunities for the Next Decade
465-471
Materials Literature
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Casimir Effect for Massless Fermions in One Dimension: A Force Operator Approach
We calculate the Casimir interaction between two short range scatterers embedded in a background of one dimensional massless Dirac fermions using a force operator approach. We obtain the force between two finite width square barriers, and take the limit of zero width and infinite potential strength to study the Casimi…
Spin susceptibility and effective mass of two-dimensional electrons inMgxZn1−xO/ZnOheterostructures
We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of ${\text{Mg}}_{x}{\text{Zn}}_{1\ensuremath{-}x}\text{O}/\text{ZnO}$ single heterostructures ($x=0.05$, 0.08, and 0.11), grown by molecular-beam epitaxy on (0001) ZnO substrates.…
Tuning the exciton g-factor in single InAs/InP quantum dots
Photoluminescence data from single, self-assembled InAs/InP quantum dots in magnetic fields up to 7 T are presented. Exciton g-factors are obtained for dots of varying height, corresponding to ground state emission energies ranging from 780 meV to 1100 meV. A monotonic increase of the g-factor from -2 to +1.2 is obser…
Determination of the optical band gap for amorphous and nanocrystalline copper oxide thin films prepared by SILAR technique
Amorphous copper oxide films were deposited using the SILAR technique. Both Cu 2 O and CuO crystallographic phases exist in deposited and annealed films. Crystallization and growth processes by annealing at temperatures up to 823 K form grains with nano- and micro-spherical shapes. The calculated crystallite size from…
Effect of oxygen concentration on the structural and magnetic properties of LaRh1/2Mn1/2O3 thin films
Epitaxial LaRh1/2Mn1/2O3 thin films have been grown on (001)-oriented LaAlO3 and SrTiO3 substrates using pulsed laser deposition. The optimized thin film samples are semiconducting and ferromagnetic with a Curie temperature close to 100 K, a coercive field of 1200 Oe, and a saturation magnetization of 1.7muB per formu…
Recent Advances on the Soluble Carbon Nanotubes
Recent literature (2000−2008) on the functionalization methods leading to soluble carbon nanotubes is reviewed. Carbon nanotubes (CNTs) can be solubilized by a series of methods, including their functionalization by the aryl diazonium process, use of elemental metals, simple inorganics, acids, esters, aldehydes, amine…
Targeted Paclitaxel by Conjugation to Iron Oxide and Gold Nanoparticles
The Fe(3)O(4) nanoparticles, tailored with maleimidyl 3-succinimidopropionate ligands, were conjugated with paclitaxel molecules that were attached with a poly(ethylene glycol) (PEG) spacer through a phosphodiester moiety at the (C-2')-OH position. The average number of paclitaxel molecules/nanoparticles was determine…
Monodisperse Icosahedral Ag, Au, and Pd Nanoparticles: Size Control Strategy and Superlattice Formation
This paper reports the synthesis and self-assembly of monodisperse icosahedral Ag, Au, and Pd nanoparticles with tunable sizes. Ag nanoparticles were first prepared by a modified polyol method. The as-synthesized Ag nanoparticles were all icosahedral multiply twinned particles (MTPs) with notable size variations. The…
Bending Properties of Single Functionalized Graphene Sheets Probed by Atomic Force Microscopy
We probe the bending characteristics of functionalized graphene sheets with the tip of an atomic force microscope. Individual sheets are transformed from a flat into a folded configuration. Sheets can be reversibly folded and unfolded multiple times, and the folding always occurs at the same location. This observation…
Dynamical polarization, screening, and plasmons in gapped graphene
The one-loop polarization function of graphene has been calculated at zero temperature for arbitrary wavevector, frequency, chemical potential (doping), and band gap. The result is expressed in terms of elementary functions and is used to find the dispersion of the plasmon mode and the static screening within the rand…
Macrophage Responses to Silica Nanoparticles are Highly Conserved Across Particle Sizes
Concerns about the potential adverse health effects of engineered nanoparticles stems in part from the possibility that some materials display unique chemical and physical properties at nanoscales which could exacerbate their biological activity. However, studies that have assessed the effect of particle size across a…
Engineering of Hetero-Functional Gold Nanorods for the invivo Molecular Targeting of Breast Cancer Cells
A novel technique is described to functionalize gold nanorods (GNRs) allowing for in vivo targeting of breast cancer tumors grown in athymic nude mice. GNRs were functionalized by covalent attachment of Herceptin (HER), a monoclonal antibody that enables molecular recognition of breast cancer cells expressing highly s…
Trinuclear Metallacycles: Metallatriangles and Much More
This review article is intended to be a comprehensive, and yet critical, collection of the trinuclear metallacycles described to date. The main focus will be on the geometry of the metallacycles: the synthetic pathway leading to these species will not be used as a discriminating factor. In most cases, they were obtain…
Direct Evidence for Multiferroic Magnetoelectric Coupling in0.9BiFeO3–0.1BaTiO3
Magnetic, dielectric and calorimetric studies on 0.9BiFeO3-0.1BaTiO3 indicate strong magnetoelectric coupling. XRD studies reveal a very remarkable change in the rhombohedral distortion angle and a significant shift in the atomic positions at the magnetic Tc due to an isostructural phase transition. The calculated pol…
Preparation and characterization of helical self-assembled nanofibers
This tutorial review serves as an introduction to helical self-assembled systems, illustrated by a specific class of helical aggregates: helical nanofibers. The common ways by which these systems are designed, prepared, and characterized will be presented.
Organic Reactions on Silica in Water
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTOrganic Reactions on Silica in WaterSatoshi Minakata* and Mitsuo KomatsuView Author Information Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871, Japan* Author to whom correspondence should be addressed (e…
Growth and Characterization of BaGa4S7: A New Crystal for Mid-IR Nonlinear Optics
The new nonlinear optical (NLO) crystal BaGa 4 S 7 for the mid-infrared (IR) has been grown by a Bridgman-Stockbarger technique. Polycrystalline materials with stoichiometric composition were synthesized from BaS, Ga, and S as the initial materials by solid-state reactions. The ultraviolet (UV) and IR transmittance of…
Comparison of Molecular and Histological Changes in Zebrafish Gills Exposed to Metallic Nanoparticles
Research has demonstrated that metallic nanoparticles produce toxicity in aquatic organisms that is due largely to effects of particulates as opposed to release of dissolved ions. The present research examined the interplay of nanoparticle composition and dissolution on response of the zebrafish gill following exposur…
Activation of Carbon Nitride Solids by Protonation: Morphology Changes, Enhanced Ionic Conductivity, and Photoconduction Experiments
Covalently bonded carbon nitride materials (e.g., g-C(3)N(4)) have numerous potential applications ranging from semiconductors to fuel cells. But their solubility is poor, which makes characterization and processing difficult. Moreover, the chemistry of the as-synthesized carbon nitrides has been widely neglected. Her…