Materials Literature
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Effective nanomedical devices for tumor imaging and drug delivery are not yet available. In an attempt to construct a more functional device for tumor imaging, we have embedded quantum dots (which have poor circulatory behavior) within hydrogel nanoparticles made of poly-N-isopropylacrylamide. We found that the hydrog…
Microphase-separated structures in poly(styrene- block -isoprene) (SI) block copolymer thin films were investigated by transmission electron microtomography (TEMT). The SI block copolymer showed cylindrical microdomains in the bulk state . Several block copolymer thin films with different thicknesses were prepared by…
Electrooxidation of dimethoxymethane ( DMM, H 2 C(OCH 3 ) 2 ), a promising alternative fuel to methanol in direct fuel cells, on a Pt electrode in acidic solutions was studied by in situ Fourier transform infrared (FTIR) reflection spectroscopy. The study revealed that the dissolved products of DMM oxidation are mainl…
Abstract The structures of the naturally occurring sulfite‐bearing minerals scotlandite, hannebachite and orschallite have been studied by Raman spectroscopy. Raman bands are observed for scotlandite PbSO 3 at 935, 880, 622 and 474 cm −1 and are assigned to the (SO 3 ) 2− ν 1 ( A 1 ), ν 3 ( E ), ν 2 ( A 1 ) and ν 4 (…
The separation of metallic and semiconducting single-wall carbon nanotubes (SWCNTs) was achieved using sucrose as a gradient medium in density-gradient ultracentrifugations (sucrose-DGU). By lowering the temperature during sucrose-DGU and tuning the concentrations of the surfactants, metallic and semiconducting SWCNT…
The adsorption and decomposition of NO on planar Ir(210) and nanofaceted Ir(210) with tunable facet sizes (5−14 nm) have been studied by means of temperature programmed desorption (TPD), high-resolution electron energy loss spectroscopy (HREELS), and density functional theory (DFT). Evidence has been found for structu…
Abstract A novel aromatic diamine, 1,1‐bis(4‐amino‐3,5‐dimethylphenyl)‐1‐(3,4,5‐trifluorophenyl)‐2,2,2‐trifluoroethane, containing a pendant polyfluorinated phenyl group, a trifluoromethyl group, and methyl groups ortho‐substituted to the amino groups in the structure was synthesized and characterized. The diamine was…
A sample consisting of gold dispersed on high-area porous lanthanum oxide was prepared by adsorption of dimethylgold acetylacetonate. X-ray absorption spectroscopy and infrared (IR) spectroscopy were used to characterize the gold species and their ligands, and CO as a probe molecule was used with IR spectroscopy to fo…
In order to evaluate the role of 3(S)-hydroxyproline [3(S)-Hyp] in the triple-helical structure, we produced a series of model peptides with nine tripeptide units including 0-9 3(S)-hydroxyproline residues. The sequences are H-(Gly-Pro-4(R)Hyp)(l)-(Gly-3(S)Hyp-4(R)Hyp)(m)-(Gly-Pro-4(R)Hyp)(n)-OH, where (l, m, n) = (9,…
A monomer having a 2,4,5-triphenylimidazole moiety was prepared by the reaction of benzoin and 3-vinylbenzaldehyde with ammonium acetate and 1-butylimidazolium tetrafluoroborate in moderate yield. The radical copolymerization of the obtained monomer and MMA were carried out at 60 °C for 24 h by using AIBN (5 mol %) as…
High field magnetization and high-frequency electron spin resonance measurements on the perovskite Co oxide ${\text{Sr}}_{1\ensuremath{-}x}{\text{Y}}_{x}{\text{CoO}}_{3\ensuremath{-}\ensuremath{\delta}}$ ($x=0.22$ and 0.25) have been performed in magnetic fields up to 53 T. We have observed the spin-state transition,…
The adsorptions of a glycine molecule as well as dehydrogenated radicals on the side walls of both intrinsic and boron-doped (B-doped) single-walled (8,0) carbon nanotubes (SWCNTs) were investigated by a density functional theory. A glycine molecule tends to physically adsorb on intrinsic SWCNTs yet chemically adsorb…
Reaction of TiCl(2)(Me(2)Calix) with 2 equiv of LiNHNRR' afforded the corresponding terminal hydrazido(2-) complexes Ti(NNRR')(Me(2)Calix) (R = Ph, R' = Ph (1) or Me; R = R' = Me (3)) which were all structurally characterized. The X-ray structure of Ph(2)NNH(2) is reported for comparison. Compound 1 was also prepared…
Nowadays, the end-of-life of plastic products and the decrease of fossil energy are great environmental problems. Moreover, with the increase of food and nonfood transformations of renewable resources, the quantities of agro-industrial byproducts and wastes increase hugely. These facts allow the development of plastic…
The segmental relaxation process in atactic and isotactic polypropylene (PP) is studied over the temperature (258−323 K) and pressure (0−300 MPa) ranges by means of dielectric spectroscopy. The combined dielectric and equation of state data provide a means of disentangling the relative influence of thermal energy and…
Recent studies of chitosan have increased the interest in its conversion to chitooligosaccharides (COSs) because these compounds are water-soluble and have potential use in several biomedical applications. Furthermore, such oligomers may be more advantageous than chitosans because of their much higher absorption profi…
The relative merits and domains of application of three observation techniques (atomic force microscopy, Michelson interferometry, and laser confocal microscopy with differential interference contrast microscopy) for the investigation of crystal growth kinetics are discussed in the context of protein crystallization.…
In this work, we describe the design and first experimental results of a new setup that combines evaporation of liquids in ultrahigh vacuum conditions with in situ high sensitivity thermal characterization of thin films. Organic compounds are deposited from the vapor directly onto a liquid nitrogen cooled substrate, p…
We assembled multilayer films of glucose oxidase (GOx) and horseradish peroxidase (HRP) coimmobilized together with polyelectrolyte layers on the surface of silica microparticles. The influence of different polyelectrolyte combinations on the immobilization and functionality of the enzymes was examined for several mul…
Solvatochromic shifts in the absorbance and fluorescence spectra are observed when surfactant-stabilized aqueous single-walled carbon nanotube (SWNT) suspensions are mixed with immiscible organic solvents. When aqueous surfactant-suspended SWNTs are mixed with o-dichlorobenzene, the spectra closely match the peaks for…