Materials Literature
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Abstract Atom transfer radical polymerization (ATRP) is a robust method for the preparation of well‐defined (co)polymers. This process has also enabled the preparation of a wide range of polymer brushes where (co)polymers are covalently attached to either curved or flat surfaces. In this review, the general methodolog…
Experimental method of determination of the fractal dimensions of fractal aggregates are described. The results of studies on aggregation of colloidal particles in different regimes are discussed. Data on the hydrodynamics of colloid dispersions containing fractal aggregates and on rheology of fractal gels are present…
A recombination emission spectrum is applied to study the local lattice distortion due to core excitation in graphite. The recombination emission spectrum reveals a long low-energy tail when the C $1s$ electron is excited to the $σ^*$ core exciton state. This indicates a large local lattice distortion around the excit…
We develop a quantum analog of the classical spin-torque model for current-driven magnetic dynamics. The current-driven magnetic excitation at finite field becomes significantly incoherent. This excitation is described by an effective magnetic temperature rather than a coherent precession as in the spin-torque model.…
Silk fibroin (SF)-based or -coated biomaterials hold structural and surface properties that render them suitable for biomedical applications. In this work, we investigated the behavior of four strains of normal human adult fibroblasts (HAFs) seeded onto polyurethane foam, uncoated (PUF) or SF coated (PUF/SF). HAF adhe…
A simple and repeatable method is described for wet-spinning poly(L-lactic acid) (PLLA) and poly(DL-lactic-co-glycolic acid) (PLGA) monofilament fibers. These fibers are strong, elastic, and suitable for many applications, including use as tissue-engineering scaffolds. The PLLA wet-extruded fibers do not show addition…
A volume-persistent culture of adipose tissue under in vivo conditions can be achieved only by early vascularization after cell transplantation. Cotransplantation of autologous preadipocytes with endothelial cells may enable the early formation of a capillary network. Investigations were performed in vivo in a special…
We have grown VO2 thin films by laser ablation for electronic device applications. In obtaining the thin films of the pure VO2 phase, oxygen partial pressure is a critical parameter because vanadium oxides have several phases with the oxygen concentration. It is found that the pure VO2 films are epitaxially grown on A…
The crystal structure of porcine pancreatic elastase (PPE) complexed with a new benzoxazinone inhibitor, TEI-8362, of human neutrophil elastase (HNE) was determined at 1.8 A resolution. The hydroxyl oxygen of Ser195 opened the benzoxazinone by nucleophilic attack and formed a covalent bond with the carbonyl carbon. Hy…
We have used scanning tunnelling microscopy (STM) to study the structure and reactivity of metal nanoparticles on a TiO2(110) surface. We have deposited two metals (Pt and Ru) using different techniques, metal vapour deposition (MVD) for Pt and metal organic chemical vapour deposition (MOCVD) for Ru. Pt was deposited…
A novel dialysis-based technique was developed for the rapid and sample-saving determination of the precipitant dependence of protein solubility. A unique thin dialysis cell was developed which permits both the direct optical measurement of protein concentration and the observation of concentration gradients around a…
New methodologies with synchrotron radiation and X-ray free electron lasers (XFELs) in structural biology are being developed. Recent trends in harnessing softer X-rays in protein crystallography for phase determination are described. These include reference to a data-collection test at 2.6 A wavelength with a lysozym…
We have demonstrated that the magnetic susceptibility measurement is a nondestructive, fast, and accurate method to determine the residual metal catalysts in a few microgram single-walled carbon nanotube (SWCNT) sample. We have studied magnetic impurities in raw and purified SWCNTs by magnetic susceptibility measureme…
Abstract A microfluidic system was designed, fabricated and implemented to study the behavior of polyelectrolyte capsules flowing in microscale channels. The device contains microchannels that lead into constrictions intended to capture polyelectrolyte microcapsules which were fabricated with the well‐known layer‐by‐l…
Electron-conducting quantum-dot solids can be prepared on the basis of assemblies of colloidal insulating nanocrystals if electrons can be injected in the delocalized conduction orbitals. We discuss the energetics of electron injection in such an artificial solid consisting of weakly coupled quantum dots. We show that…
Assisted by ab initio calculation, a realistic Cu–Ta potential is derived and applied to determine the energies of Cu/Ta interfaces with various orientations by molecular dynamics simulations. It turns out that the (111) Cu/(100) Ta and (111) Cu/(110) Ta interfaces are thermally stable at a temperature of 873 K and th…
Photoluminescence, absorption, and photocurrent measurements were made for a hybrid system of 1-thioglycerol-capped HgTe nanoparticles synthesized by colloidal method to investigate the photocurrent mechanism in this hybrid system. Absorption and photoluminescence spectra taken for the capped HgTe nanoparticles reveal…
Protein crystallography micro-diffraction and micro small-angle X-ray scattering at a third-generation synchrotron radiation source undulator beamline both require a compromise on beam size and beam divergence. Micro small-angle X-ray scattering requires in addition an as-close-as-possible angular approach to the dire…
The spectroscopic and electrochemical properties of two-dimensional electrostatic assembly of Au nanocrystals are examined on poly-L-lysine (pLys) modified gold electrodes. The surface preparation for the nanoparticle deposition involved the self-assembly of a monolayer of 11-mercaptoundecanoic acid on the electrode s…
We developed two novel methods for growing large, high-quality protein crystals. A two-liquid system enables the convenient extraction of protein crystals without causing mechanical damage due to growth at the interface between two liquids. Since this system does not require limitations on solution volume, it is also…