Materials Literature
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Colloidal zinc oxide (ZnO) nanocrystals are attractive candidates for a low-temperature and solution-processible semiconductor for high-performance thin-film field-effect transistors (TFTs). Here we show that by controlling the shape of the nanocrystals from spheres to rods the semiconducting properties of spin-coated…
We report that freestanding films of vertically aligned carbon nanotubes exhibit super-compressible foamlike behavior. Under compression, the nanotubes collectively form zigzag buckles that can fully unfold to their original length upon load release. Compared with conventional low-density flexible foams, the nanotube…
The ability of engineered cerium oxide nanoparticles to confer radioprotection was examined. Human normal and tumor cells were treated with nanoceria and irradiated, and cell survival was measured. Treatment of normal cells conferred almost 99% protection from radiation-induced cell death, whereas the same concentrati…
Diamond nanocrystals emit bright fluorescence at 600-800 nm after irradiation by a 3 MeV proton beam (5 x 1015 ions/cm2) and annealing at 800 degrees C (2 h) in vacuum. The irradiation/annealing process yields high concentrations of nitrogen-vacancy defect centers ( approximately 107 centers/mum3), making possible vis…
The localized synthesis of 4.2-5.6 nm-Si nanocrystals (nc-Si) in Si-rich SiO<sub>2</sub> (SRSO) by CO<sub>2 </sub>laser annealing at laser intensity of below ablation-threshold (6 kW/cm<sup>2</sup>) is demonstrated. Since the SRSO exhibits a high absorption coefficient of up to 0.102 cm<sup>-1</sup> at wavelength of 1…
As indicated by the data presented in this chapter, modem electrochemical techniques are useful for MIC investigations. However, the nature of MIC makes it extremely difficult to use electrochemical techniques for detection, quantification, mechanistic studies, or monitoring. MIC is often the result of viable microorg…
In this work, flame retardancy of ethylene-vinyl acetate copolymer (EVA) is investigated incorporating Mg(OH) 2 (MDH) as flame retardant combined with ammonium polyphosphate (APP) as potential synergist. It is shown that APP is a synergistic agent in EVA-MDH formulations in terms of LOI and cone calorimetry. The inter…
We prepared carbon nanospheres by pyrolysis of core cross-linked diblock copolymer micelles. Poly(ethylene oxide)- b -poly(4-ethynylstyrene) (PEO−PES) with a hydrophobic block having curable acetylenic groups was synthesized by atom transfer radical polymerization. The number-average molecular weight ( M n ) of the PE…
Three DTPA-derivative ligands, the non-substituted DTPA-bis(amide) (L(0)), the mono-substituted DTPA-bis(n-butylamide) (L(1)) and the di-substituted DTPA-bis[bis(n-butylamide)] (L(2)) were synthesized. The stability constants of their Gd3+ complexes (GdL) have been determined by pH-potentiometry with the use of EDTA o…
FeCo-Al2O3 nanocomposite aerogels were studied by high-resolution electron microscopy, energy filtered transmission electron microscopy, Mössbauer spectroscopy, and measurements of static magnetizations and hysteretic behavior. The combined use of such techniques provided insights on the formation of bcc FeCo nanocrys…
This paper describes the synthesis and in-depth characterization of two new porphyrogenic macrocycles 1 and 2, and provides an evaluation of these molecules as photosensitizer agents. By tuning the reaction conditions and starting from readily available 1,9-diformyl-5-phenyldipyrromethane (4) and tripyrrane dicarboxyl…
Peptide-based hydrogels have gained interest for biomedical applications as a result of their biodegradability and bioresorbability. For in vivo applications, these hydrogels should be able to easily assemble in a controlled manner and should possess compatibility with entrapped biomolecules. Mutually attractive but s…
The dispersion characteristics and rheology of organoclay nanocomposites based on a thermotropic liquid-crystalline polymer (TLCP) having pendent functional group were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and oscillatory shear rheometry. For the study, a segmented main-ch…
Abstract Nematic, or liquid‐crystalline, polymer nanocomposites (NPNCs) are composed of large aspect ratio, rod‐like or platelet, rigid macromolecules in a matrix or solvent, which itself may be aqueous or polymeric. NPNCs are engineered for high‐performance material applications, ranging across mechanical, electrical…
Spectroscopic, chemical, thermal, and voltammetric analyses on six kinds of alkylcarboxylate-stabilized silver nanoparticles 4.7 nm in diameter were carried out with an aim to reveal the effect of alkylcarboxylates on the optical, thermal, geometric, and electrochemical properties of the nanoparticles. These nanoparti…
By recording XPS spectra while applying external voltage stress to the sample rod, we can control the extent of charging developed on core-shell-type gold nanoparticles deposited on a copper substrate, in both steady-state and time-resolved fashions. The charging manifests itself as a shift in the measured binding ene…
A processable multiple aromatic ether-linked phthalonitrile with high thermal and oxidative stability has been synthesized and characterized. The oligomeric phthalonitrile monomer was prepared in a two-step, one-pot procedure using an excess amount of resorcinol and 4,4'-difluorobenzophenone in a N,Ndimethylformamide/…
The reactions of silver(I) cyanide with tetraalkylammonium salts in anhydrous tetrahydrofuran (THF) under solvothermal conditions and then diffused with ether lead to two novel mixed halogeno(cyano)argentates(I) with efficient luminescence.
By incorporating an ester-containing substrate in a self-assembled alignment layer for liquid crystal cells, the presence of a lipase (CALB) can be directly detected through its enzymatic action on the alignment layer, without the need for fluorescent labelling or enzyme assays.
Low-temperature reduction behavior of a CeO2−ZrO2−Bi2O3 solid solution was promoted by the addition of silver, which is an oxygen permeable component. The reactivity of oxygen in the bulk of the catalyst highly improves the soot combustion activities at low temperatures.