Materials Literature
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Abstract Summary: A liquid‐crystalline (LC) compound, having a cinnamate moiety on each end of the molecule, was synthesized and irradiated with UV light in its LC phase in the presence of a triplet sensitizer. Various measurements of the irradiated sample revealed that the linearly structured LC oligomers were formed…
The self-assembled, nanoscale domains of a lyotropic liquid crystal are used as a compatibilizing platform for the simultaneous polymerization of immiscible hydrophilic and hydrophobic crosslinking monomers (see figure). The influence of the liquid crystal reduces phase separation, resulting in a material with propert…
We have examined transport mechanisms in amorphous solid water (ASW) by studying thermal desorption of layered nanoscale films of CCl4 and labeled ASW. The interlayer mixing observed near T approximately 150-160 K is inconsistent with a mechanism involving diffusion through a dense phase. Instead, intermixing occurs v…
Abstract Summary: CdS nanoparticles dispersed within poly(urethane acrylate‐ co ‐styrene) ( PUCS ) films were prepared using amphiphilic urethane acrylate nonionomer (UAN) precursor chains, which had a poly(propylene oxide)‐based hydrophobic segment and a hydrophilic poly(ethylene oxide) segment. CdS nanoparticles wer…
The magnetic properties of the hydrogenated single-walled carbon nanotubes (SWNTs) have been studied by the first-principles calculations. It is found that different distributions of hydrogen atoms on the SWNT surfaces have a significant effect on the magnetic order of the hydrogenate SWNTs. More importantly, it has b…
BaTiO 3 (BTO) films have been epitaxially grown on SrTiO 3 (001) and SrTiO 3 (111) substrates with a LaNiO 3 conductive layer as a template using pulsed laser deposition. X-ray diffraction θ–2θ and ψ scanning reveal that the epitaxial relationship for these samples fabricated at 600 °C and 700 °C are BTO[001]//LNO[001…
Abstract Summary: Soluble carbon nanotubes were prepared by treating SWNTs with sec ‐butyllithium and subsequently using the generated carbanions as the initiator to graft P t BA and P t BA‐ b ‐PMMA onto the surface of SWNTs. The anionic polymerization initiated by SWNTs‐bearing carbanions not only provides a powerful…
Abstract Summary: A facile and organic‐solvent‐free method for preparing thermoprocessable multiwalled carbon nanotube (MWCNT)‐filled thermoplastics is presented. MWCNTs are oxidized, neutralized, and then assembled with cationic soap‐free poly(methyl methacrylate) (PMMA) particles directly in water. The spontaneous e…
Rare earth terbium (Tb)-doped zinc sulfide (ZnS) nanocrystals (NCs) sized between 3 and 4 nm were synthesized via a co-precipitation reaction of precursors, zinc acetate (Zn(CH 3 COO) 2 ), terbium chloride (TbCl 3 · 6H 2 O), lithium fluoride (LiF) and thiocarbamide in a methacrylic acid/citric acid/methanol mixing sol…
Barium strontium titanate (Ba 0.6 Sr 0.4 TiO 3 , BST) films have been deposited on Pt/Ti/SiO 2 /Si substrates by radio frequency magnetron sputtering. The influences of conventional thermal annealing (CTA) and rapid thermal annealing (RTA) on the chemical structures of the surface layers of the BST films have been inv…
Wurtzite ZnS one-dimensional (1D) nanostructures with Mn and Cd as dopants were synthesized rapidly with Zn and S in the vapour phase. The Au-film coated Si wafers were used as substrates. Photoluminescence measurements were carried out at room temperature on the Mn-doped, Cd-doped and Mn, Cd co-doped ZnS 1D nanostruc…
An investigation of the ferroelectric and dielectric properties of niobium-doped SrBi 4 Ti 4 O 15 (SrBi 4− x /3 Ti 4− x Nb x O 15 , x = 0.00, 0.003, 0.012, 0.03, 0.06) ceramics was presented. The ferroelectric property of SrBi 4 Ti 4 O 15 was improved by niobium doping. The remanent polarization (2 P r ) increases at…
The evolution of the thermoluminescence glow curve of a natural Ca-Be rich aluminosilicate after annealing treatments at different temperatures has been studied in order to evaluate the changes in the trapped charge distribution. The glow curve consists of a single broad peak that continuously shifts toward higher tem…
We have studied theoretically the far- and near-field scattering response of bimetallic Ag/Au core-shell and alloy nanoparticles. Particular emphasis is put on the near-field study, which is known to play a fundamental role in surface enhanced spectroscopies. The comparison between the scattering spectra of core-shell…
Discrete jumps are observed in the emitted current density (J) versus extraction electric field (E) curves in electron field emission measurements from a conductive, hydrogen-terminated air-exposed diamond surface. These jumps are well reproduced by computations based on the assumption that a 2D nanoscale quantum syst…
Abstract An organic compound with two triphenylamine moieties linked with binaphthyl at the 3,3′‐positions (2,2′‐dimethoxyl‐3,3′‐ di(phenyl‐4‐yl‐diphenyl‐amine)‐[1,1′]‐binaphthyl, TPA–BN–TPA) can be synthesized by Suzuki coupling. Amorphous and homogeneous films are obtained by either vacuum deposition or spin‐coating…
A silica nanoparticle has been successfully employed as a nanoscaffold to self-organize porphyrin and C60 molecules on a nanostructured SnO2 electrode. The quenching of the porphyrin excited singlet state on the silica nanoparticle is suppressed significantly, showing that silica nanoparticles are promising scaffolds…
Abstract A series of novel poly(amine amide)s ( IIa – IIl ) with pendent N ‐carbazolylphenyl units having inherent viscosities of 0.25–1.06 dL/g were prepared via direct phosphorylation polycondensation from various dicarboxylic acids and a carbazole‐based aromatic diamine. Except for poly(amine amide) IIc , derived f…
The adsorption and thermal desorption of Zn and ZnO on Pd(111) was studied in the temperature range between 300 and 1300 K with TDS, LEED, and CO adsorption measurements. At temperatures below 400 K, multilayer growth of Zn metal on the Pd(111) surface takes place. At a coverage of 0.75 ML of Zn, a p(2 x 2)-3Zn LEED s…
Reported are three adults who developed frequent episodes of a complex neurologic syndrome years after radiation therapy for a brain tumor. MRI and [(18)F]fluorodeoxyglucose PET performed during the episodes demonstrated dramatic gyral thickening with enhancement and intense hypermetabolism in symptomatic regions that…