Materials Literature
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Achromatic doublets made of materials with normal dispersion have been used for decades to minimize the effects of chromatic aberrations inherent to single-glass optical lenses. Here, we propose a fundamentally different solution to correct the chromatic aberrations based on a nanowire metamaterial with low loss broad…
Nanoparticle-based contrast agents are expected to play a major role in the future of molecular imaging due to their many advantages over the conventional contrast agents. These advantages include prolonged blood circulation time, controlled biological clearance pathways, and specific molecular targeting capabilities.…
BACKGROUND/PURPOSE: The knowledge how surfactants and hydrolyzed proteins influence the elastic properties of living epidermal keratinocytes is sparse. We demonstrate that the stiffness of cells measured by atomic force microscope (AFM) can be correlated with viability test. METHODS AND MATERIALS: The effects of sodiu…
We demonstrate that ca. 5 nm nanodiamond particles dramatically improve triglyceride lipid removal from a hydrophobic surface at room temperature using either anionic or nonionic surfactants. We prepare nanodiamond-surfactant colloids, measure their stability by dynamic light scattering and use quartz crystal microbal…
We report on atmospheric pressure argon plasma-based surface treatment and hybrid laser-plasma ablation of barite crown glass N-BaK4 and heavy flint glass SF5. By pure plasma treatment, a significant surface smoothing, as well as an increase in both the surface energy and the strength of the investigated glass surface…
In this study, in situ–forming quercetin-conjugated heparin hydrogels to be used to coat metal surfaces for blood compatibility were developed and characterized. Four units of quercetin and poly(ethylene glycol)–tyramine were conjugated per heparin for blood compatibility and hydrogel formation, respectively. The prod…
We investigate the structure of Hofstadter's butterfly of graphene with point defects under a perpendicular magnetic field. We use a tight-binding method with interactions up to second-nearest neighbors. First of all, we present the Hofstadter butterfly spectrum of pure graphene, including all four valence orbitals wi…
Electronic scattering at individual defect sites is presumably sensitive to defect chemistry. Here, we combine advances in carbon nanotube device fabrication and scanning probe characterization to investigate this correspondence. Specifically, we apply scanning gate spectroscopy (SGS) to the study of defects introduce…
The pH‐dependent surface‐enhanced Raman scattering (SERS) of 1,2,4‐triazole adsorbed on silver electrode and normal Raman (NR) spectra of this compound in the aqueous solutions were investigated. The observed bands in the NR and SERS spectra were assigned with the help of density functional theory calculations for mod…
Efficient incorporation of (PtCl3EtOH)(-) anion derived from CisPt moiety into ureasil-PPO (poly(propylene oxide)) network was achieved from one-pot sol-gel synthesis carried out in the presence of water, HCl, and ethanol. Reactant proportion was adequately chosen to lead the sol-gel formation of siloxane nodes at the…
Mesoporous material SBA-15 of hexagonal structure was synthesised and its usefulness as a carrier for a poorly soluble drug--lacidipine (LA)--was tested. The source of silica was tetraethyl orthosilicate (TEOS) and the structure ordering agent was non-ionic surfactant Pluronic P123. SBA-15 with encapsulated LA was cha…
Objectives: Silicon quantum dots (SiQDs) are of great interest for bio - imaging applications due to their tunable luminescence, low toxicity, unique surface chemistry, and high quantum yield. Most synthesis routes produce SiQDs that are not water-dispersible, making them unattractive for biological applications. Here…
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTCross-linked Heterogeneous Nanoparticles as Bifunctional ProbeMenghan Wang†§, Chao Wang*†, Kaylie L. Young∥, Liangliang Hao∥, Milica Medved⊥, Tijana Rajh‡, H. Christopher Fry‡, Leyi Zhu†, Gregory S. Karczmar⊥, Cornelius Watson*§, J. Samuel Jiang†, Nenad M. Markovic†, and V…
Abstract Polybenzimidazole fibers, with an average diameter of 262 nm, were produced by the process of electrospinning. These fibers were used as a solid support material for the immobilization of oxovanadium(IV) which was achieved via a reaction with vanadyl sulfate. The oxovanadium(IV)‐functionalized nanofibers were…
The dynamic tensile strength of steel fibre reinforced concrete is experimentally investigated. Cylindrical specimens are first fabricated with three different fibre volume fractions of 0, 0·75% and 1·5%. These specimens are then tested by using the Hopkinson pressure bar technique. Their dynamic tensile strengths are…
Abstract Parinari polyandra Benth seed oil was utilized in the preparation of four sets of alkyd resin (35%, 50%, 60%, and 75% oil formulations) using a two‐stage alcoholysis‐polyesterification method. The rate of polyesterification was depended on the amount of oil used during synthesis. The properties of the alkyds…
Dihydrodipicolinate synthase (DHDPS) is an essential enzyme involved in the lysine biosynthesis pathway. DHDPS from E. coli is a homotetramer consisting of a 'dimer of dimers', with the catalytic residues found at the tight-dimer interface. Crystallographic and biophysical evidence suggest that the dimers associate to…
The extreme strength and toughness of a natural material from a marine shrimp can be explained by its intricate layered structure.
We describe and analyze a tight-binding model of single-molecule magnets (SMMs) that captures both the spin and spatial aspects of the SMM electronic structure. The model generalizes extended H\"uckel theory to include the effects of spin polarization and spin-orbit coupling. For neutral and negatively charged Mn${}_{…
Based on the scattering cancellation technique we suggest a cloak that allows to conceal macroscopic objects, i.e. objects with an optical size comparable to wavelengths in the visible and whose scattering response is dominated by a magnetic dipole contribution. The key idea in our approach is to use a shell of polari…