Materials Literature
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Nanocrystals of different size and functionality (e.g., noble metals, semiconductors, oxides, magnetic alloys) can be induced to self-assemble into ordered binary superlattices (also known as opals or colloidal crystals), retaining the size tunable properties of their constituents. We have built a variety of binary su…
Self-assembly of charged, equally sized metal nanoparticles of two types (gold and silver) leads to the formation of large, sphalerite (diamond-like) crystals, in which each nanoparticle has four oppositely charged neighbors. Formation of these non-close-packed structures is a consequence of electrostatic effects spec…
The cyclic instability phenomenon is investigated at the modeling of large elasto-plastic strains. The instability is observed at large strains for some elasto-plastic material models with a kinematic hardening in contrast to the small strain case. The cyclic instability manifests itself as a changing of shape, sizes…
Bicomponent fibers, in the range of 100 nm to a few microns, of miscible poly(vinylchloride)/segmented polyurethane (PVC/Estane®) and immiscible poly(vinyl chloride)/poly(vinylidienefluoride) (PVC/PVDF) were produced respectively by electrospinning two polymer solutions in a side-by-side approach. For each of the pair…
Conducting polymers, carbon nanotubes, and their hybrid structures are promising for various sensing applications. While the electrospun lithium perchlorate (LiClO 4 )-doped polyethylene oxide (PEO) nanofibers have been shown to be good humidity sensing materials, camphosulfonic acid (HCSA)-doped polyaniline (PANI)/po…
This paper considers the development of a comprehensive model of the electrospinning process. All stages of the electrospinning process, from the preparation of the solution to the collection of the nanofibers are discussed together from the point of view of manufacturing. Experimental observations of the three-dimens…
We have successfully developed a unique multiple-jet electrospinning technology at STAR, Inc. and Stony Brook University. The development of this technology was primarily accomplished by the incorporation of secondary electrodes to isolate the electric field distribution of the primary electrode spinnerets, the design…
The crystal structure of an uncharacterized conserved protein (residues 1–243) expressed by yfiH gene of Shigella flexneri 2a str.2457T (gi 30042248),1 has been determined and refined to 2.01 Å by single wavelength anomalous dispersion (SAD) method. The YfiH protein belongs to a vast protein family of at least 201 unc…
Four low molecular mass lysine dendrimers were synthesized by Boc chemistry in solution (155 and 169) and Fmoc chemistry on solid support (P2 and P13). The structure and fragmentation mode of the above dendrimers was investigated in gas phase by the LSI-MS and ESI-MS techniques. (1)H and (13)C NMR analysis in solution…
Assembly of alpha-synuclein (alpha-Syn) into neurotoxic oligomers and fibrils is an important pathogenic feature of Parkinson's disease. Studying the early events of alpha-Syn aggregation, such as oligomerization and nucleation, is indispensable to understanding the complicated process. Here, photo-induced cross-linki…
Rational routes to synthetic porphyrins bearing distinct meso-substituents have typically been implemented at modest scale (<1 g quantities). The A 3 B-porphyrin 5-(4-hydroxymethylphenyl)-10,15,20-tri- p -tolylporphinatozinc(II) ( Zn-1 ) is required in multigram quantities for possible commercial use in information st…
We report on the statistical analysis of the variations in the size and position of sub-5nm tungsten-containing dots in regular arrays deposited by electron-beam-induced deposition. Full widths at half maximum of the dots are 4.2 and 2.0nm in average. It can be observed in the recorded annular dark-field images that t…
Atomistic simulation techniques are used to examine the defect chemistry of perovskite-structured NdCoO(3), a material whose electrochemical properties make it attractive for use in heterogeneous oxidation catalysis, as well as in gas sensors and mixed ionic/electronic conductors. In practice, dopants are added to NdC…
Abstract A new species of the mainly sand-dwelling marine diatom genus Attheya is described from the Sea of Japan. Of the seven species of the genus, Attheya ussurensis most closely resembles Attheya decora in its valve and girdle structure and in its plastid form and number, but it also possesses features found in on…
Sandwich-type supramolecular cation structures of (M(+))([12]crown-4)(2) complexes (M(+) = Li(+), Na(+), K(+), and Rb(+)) were introduced as countercations to the [Ni(dmit)(2)](-) anion, which bears an S = (1)/(2) spin, to form novel magnetic crystals (dmit(2-) = 2-thione-1,3-dithiole-4,5-dithiolate). The zigzag arran…
The need for new photodynamic-therapy photosensitizers has stimulated the search of new families of compounds absorbing strongly in the 700-900 nm range, the region where tissue is most transparent to radiation capable to induce the photodynamic effect. Using computational chemistry techniques, 3,6,13,16-tetraazaporph…
Short-time self-diffusivities, D(S)S, are computed for attractive colloidal fluids with van der Waals potentials to identify their percolation threshold and a previously unexplained dynamic transition. Our results show a discontinuous change in the slope of D(S)S vs temperature as the percolation threshold is crossed.…
Abstract The search for practical applications of electrospun microfibers and nanofibers is primarily concentrated on filters, membranes, and biomedical devices. This chapter reviews current progress towards developing new applications of electrospinning. The production of submicron as well as nanometer sized fibers b…
Langmuir layers of a symmetric bent-core molecule with hydrocarbon end chains and two chlorine atoms substituted on the central phenyl ring of the bent core were characterized by a combination of surface pressure isotherms, Brewster angle microscopy, and surface potential measurements. These layers were found to be op…
L-Arginine kinase (AK; ATP:L-arginine N-phosphotransferase; EC 2.7.3.3) catalyzes the reversible transphosphorylation between N-phospho-L-arginine (PArg) and ATP thus buffering cellular ATP levels. AK was purified from the leg muscle of the locust Migratoria manilensis by Sephacryl S-200 HR gel filtration chromatograp…