Materials Literature
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The superparamagnetic properties of CoFe2O4 and Fe3O4 nanocrystals have been systematically investigated. The observed blocking temperature of CoFe2O4 nanocrystals is at least 100 deg higher than that of the same sized Fe3O4 nanocrystals. The coercivity of CoFe2O4 nanocrystals at 5 K is over 50 times higher than the s…
The role of intermediate species generated during wet chemical etching of silicon in a HF-rich HF/HNO3 mixture was studied by spectroscopic and analytical methods at 1 degrees C. The intermediate N2O3 was identified by its cobalt blue color and the characteristic features in its UV-vis and Raman spectra. Furthermore,…
This paper reports wurtzite-type CdS nanostructures synthesized via a hydrothermal reaction route using dithiol glycol as the sulfur source. The reaction time was found to play an important role in the shape of the CdS nanocrystals: from dots to wires via an oriented attachment mechanism. This work has enabled us to g…
We have discovered a novel property of single-walled carbon nanotubes (SWNTs)-their ability to stabilize proteins at elevated temperatures and in organic solvents to a greater extent than conventional flat supports. Experimental results and theoretical analysis reveal that the stabilization results from the curvature…
Glass transition and random packing in the hard sphere system have attracted great attention due to the important role of the system in the investigation of diverse real systems including liquids, colloidal dispersions, supercooled liquids, glasses and granular materials (1-12) Despite the importance and simplicity of…
The cellular toxicity of carbon-based nanomaterials was studied as a function of their aspect ratio and surface chemistry. These structures were multiwalled carbon nanotubes, carbon nanofibers, and carbon nanoparticles. Their toxicity was tested in vitro on lung tumor cells. Our work clearly indicated that these mater…
Mannan from Sacharomyces cerevisiae was activated by oxidation with NaIO(4) (sodium m-periodate) and further linked to SOD (superoxide dismutase) via reductive alkylation with NaBH(4) (sodium borohydride). The glycosidated enzyme contained an average of 1.2 mol of polysaccharide per mol of protein and retained 52% of…
Chemically sprayed indium-doped zinc oxide thin films (ZnO:In) were deposited on glass substrates starting from zinc pentanedionate and indium sulfate. The influence of both the dopant concentration in the starting solution and the substrate temperature on the transport, morphology, composition, linear and nonlinear o…
The highly conjugated title compound, C15H16N2O4S2, exhibits an extended planar configuration. This unusual behavior is the result of the azomethine that adopts the E configuration concomitant with the antiparallel orientation of the thiophene units. The nitrogen-containing double bond is also ca 0.04 Å shorter tha…
The separation between s-and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design method to obtain edge filters with non-polarization at incidence angle of…
This chapter reviews the application of nanoparticles as drug carriers. One of the major obstacles to drug efficacy is the nonspecific distribution of the biologically active compound after administration. Nanospheres are matrix systems in which the drug is dispersed within the polymer throughout the particle. The mos…
We report electrochromic properties of WO3 modified by platinum nanophases. The WO3 incorporated by Pt metallic nanophases (Pt–WO3) showed exactly reverse electrochromic phenomenon compared with that of both pure WO3 and WO3 intercepted and coated by metallic Pt thin-film layer. In addition, to investigate the origin…
Abstract The viscosities of aqueous solutions of gelatin at different temperatures were carefully measured in a common glass‐capillary Ubbelohde viscometer at dilute to extremely dilute concentrations. The adsorption effect that occurred in the viscosity measurements was theoretically analyzed and discussed. A theory…
First-principles calculations were carried out to study the functionalization of single wall carbon nanotubes by the chemical absorption of F and Cl atoms. Our results confirmed that the band gap of semiconductor zigzag carbon nanotubes is reduced on addition of F or Cl atoms on the walls of the nanotubes. For metalli…
Systematic studies of structure, magnetic, and electronic transport properties have been performed on lightly doped ${\mathrm{LaMn}}_{0.96}{\mathrm{Mo}}_{0.04}{\mathrm{O}}_{3}$. The results indicate that the sample sintered in air undergoes the paramagnetic-ferromagnetic transition at ${T}_{c}=238\phantom{\rule{0.3em}…
We study finite-size effects in surface-enhanced Raman scattering (SERS) from molecules adsorbed on small metal particles. Within an electromagnetic description of SERS, the enhancement of the Raman signal originates from the local field of the surface plasmon resonance in a nanoparticle. With decreasing particle size…
Size-controlled, low-dispersed calcium carbonate microparticles were synthesized in the presence of the amphiphilic block copolymer polystyrene-b-poly(acrylic acid) (PS-b-PAA) by modulating the concentration of block copolymer in the reactive system. This type of hybrid microparticles have acid-resistant properties. B…
Recent theoretical studies have suggested that the stabilizing factors for large nitrogen cages tend to favor more five-membered rings, more three-membered rings, and cylindrical structures with large numbers of layers. One of the major issues in this study of the all-nitrogen molecule is the determination of what bri…
Four types of one-dimensional (1D) heterojunctions, including Ag/Si, Pt 6 Si 5 /Si, Ni/CNT (carbon nanotube) and Ag/a-CNT (amorphous CNT), have been synthesized by combining electrochemical deposition and chemical vapour deposition, with porous membranes of anodic aluminium oxide (AAO) as templates. Each of these 1D h…
Polystyrene (PS) sphere films with loosely packed arrays were prepared by plasma etching of closely packed PS sphere arrays. The size of PS spheres can be efficiently reduced with plasma etching, and surface topography can be manipulated by controlling the initial PS sphere size and the time of plasma exposure. These…