Materials Literature
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Cerium oxide nanoparticles coated by cetyltrimethylammonium bromide (CTAB) were prepared using reverse micelles and microemulsion method. The as-prepared nanoparticles (25 °C) were annealed at 200, 350, 500, and 700 °C for 2 h. Their particle sizes are, respectively, 230, 50, 2, 6, and 10 nm as identified by transmiss…
Mixed Monolayer Protected Gold Clusters (MMPCs) featuring both hydrogen bonding and aromatic stacking molecular recognition functionalities have been used to create multivalent hosts for flavins. Multitopic binding of these hosts to flavin was shown to have a strong radial dependence: when the recognition site was bro…
Practical utilization of carbon nanotubes (CNTs) in nanoscale devices requires their directed placement on a substrate. Controlled placement has been achieved by a combination of the highly selective adsorption of single walled CNTs (SWNTs) onto open regions of amino-functionalized SiO 2 in a polymeric resist, followe…
The deposition of Cu at room temperature on a V 2 O 3 (0001) surface, which was prepared on a Re(0001) substrate at first, is studied by XPS (X-ray photoelectron spectroscopy), UPS (ultraviolet photoelectron spectroscopy), and LEED (low-energy-electron diffraction). The XPS results indicate that the growth of Cu follo…
An enzyme mimic consisting of pyridoxamines covalently linked to polyethyleneimine carrying long-chain alkyl groups converts pyruvic acid to dl-alanine with as much as an 8000-fold acceleration relative to the reaction with simple pyridoxamine at the same pyridoxamine concentration. The acceleration by polymer is a st…
We report on the synthesis and structure of silica-filled latex films. The main stage of the synthesis consists of physicochemical manipulations of colloidal solutions of nanosilica and nanolatex beads, followed by drying and filmification. Hence, no mechanical energy which might contribute to building or destruction…
A second-generation 1,3,5-phenylene-based dendritic porphyrin decorated with flexible alkyl chains exhibited a liquid crystallinity, and the inclusion of fullerene within the nanospace of the dendritic porphyrin strongly affected the mesophase structure in the thermotropic liquid-crystalline phase.
New resorbable and elastomeric ABA tri- and multiblock copolymers have been successfully synthesized by combining ring-opening polymerization with ring-opening polycondensation. Five different poly(L-lactide-b-1,5-dioxepan-2-one-b-L-lactide) triblock copolymers and one new poly(L-lactide-b-1,5-dioxepan-2-one) multiblo…
A new series of phthalocyanine-containing biodegradable copolymers, namely poly(phthalocyanine- co -sebacic anhydride) (Pc-SA), have been synthesized. For copolymers with a low Pc content, the Pc rings exist mainly as monomeric species in chloroform, while the aggregation of these macrocycles becomes significant as th…
Argon adsorption at 77 K on ordered mesoporous silicas (MCM-41, SBA-15) with pore diameters up to 9 nm and on disordered mesoporous silicas with larger pore sizes was investigated, allowing us to successfully develop a method to calculate pore size distributions (PSDs) for cylindrical pores with diameters below 15 nm.…
A series of asymmetric tetraarylporphyrins was synthesized from pyrrole, para-substituted oligo- or poly(ethylene glycol) monomethyl ether benzaldehyde and from 4-hydroxybenzaldehyde etherified with diethyl bromomalonate according to the Lindsey method. After hydrolysis of the tetraarylporphyrin esters, the resulting…
In this report, we present data demonstrating that cylindrical metallic particles, with various submicrometer striping patterns, may be readily distinguished in an optical microscope. Accurate particle identification is discussed relative to synthesis reproducibility and the limitations of optical microscopes. Results…
Polyelectrolyte multilayers deposited onto particles are exploited as thin films for localizing sol−gel reactions of inorganic precursors at particle surfaces, yielding core−shell colloids with defined shell thicknesses. The image shows silica colloids coated with a polyelectrolyte/titania shell.
To combine the cytotoxic activity of cisplatin and the phototoxicicity of hematoporphyrin derivatives in the same molecule, hematoporphyrin was derivatized at the two secondary alcohol positions by etherification with oligo- and poly(ethylene glycol) units. The two carboxylic acid groups of the propionate side chains…
Siliceous MCM-48 spheres are tailored with silane coupling agents, n -octyldimethylchlorosilane (C8) and (3-aminopropyl)triethoxysilane (APTS). The changes in adsorption features of water and acetaldehyde with the modifications are elucidated by aid of adsorption calorimetry. The MCM-48 surface exhibits a hydrophobic…
The ability to construct three- and two-dimensional architectures via nanoscale engineering is important for emerging applications of nanotechnology in sensors, catalysis, controlled drug delivery, microelectronics, and medical diagnostics. In this paper, we report novel 3D assembly using multidentate molecular buildi…
Gold−titania (Au−TiO 2 ) composite aerogels were synthesized, characterized, and tested as ambient-temperature oxidation catalysts for carbon monoxide. Adding alkanethiolate-monolayer-protected gold clusters (with ∼2-nm Au cores) directly to titania sol before gelation yields uniformly dispersed guests in the composit…
Novel oligo[poly(ethylene glycol) fumarate] (OPF) hydrogels functionalized with cell adhesion peptides were prepared, and the effects of incorporated peptide density and macromolecular structure of hydrogels on attachment and morphology of marrow stromal cells (MSCs) were evaluated. Poly(ethylene glycol) (PEG; number…
A facile high-yield synthetic route has been established for the synthesis of α-hydroxy methyl ketones. These intermediates are important precursors to the tricyanovinyldihydrofuran type of acceptor used in high μβ nonlinear optical chromophores. 3-Hydroxy-3-methyl-2-butanone is one of only three commercially availabl…
Non-covalent functionalization of carbon nanotubes (CNTs) is of paramount importance for developing new nanomaterials without destruction of the electrical properties of the CNTs. In this paper, we report a simple approach to immobilize tetra-tert-butylphthalocyanines (tBuPcs) on CNTs. The immobilization results from…