Materials Literature
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In this work, we aimed to tune the aggregation state of Au colloids by judicious regulation of their surface charges and by introduction of ultrasound irradiation. Au colloids were prepared by reduction of HAuCl4 with NaBH4 in the presence of 3-mercaptopropionic acid (MPA) as the stabilizing ligand. The Au colloids ca…
[structure: see text] A star-shaped hexa-peri-hexabenzocoronene "heptamer" was prepared, which showed a strong tendency to aggregate in solution and in the bulk states. Higher order was found in a high-temperature, columnar liquid crystalline phase due to the higher mobility of the molecules in comparison with the low…
High-temperature stable mesoporous SiOC ceramic was prepared by the self-assembling reaction between an anionic surfactant and the inorganic precursor N-trimethoxylsilylpropyl-N,N,N-trimethylammonium chloride, followed by calcination at 600 °C under nitrogen. The preferred structure was adjusted by varying the co-stru…
The first examples of liquid crystalline mononuclear palladium and platinum organyls carrying semiperfluorinated alkyl chains at their peripheries have been synthesised. The phase behaviour of the semifluorinated compounds was investigated by optical polarizing microscopy, differential scanning calorimetry and X-ray s…
The preparation and characterization of selected ammonium and methylammonium tetraazidoaurates(III) are reported. All ammonium salts were shown to be highly explosive materials. The first crystal structure of such an ammonium salt, that of [Me(4)N][Au(N(3))(4)], features polymeric units of the anion, which are linked…
Layer-by-layer (LbL) films from WO 3, TiO 2, and chitosan have been produced, in which the ability of complexation of chitosan with transition metal oxides was exploited. The electrochemical and chromogenic properties of LbL films of (chitosan/WO 3 ) 4 /TiO 2 and (chitosan/WO 3 /chitosan/TiO 2 ) 4 have been examined a…
The spreading of a partially wetting aqueous drop in air on a hydrophobic surface can be facilitated by the adsorption of surfactants from the drop phase onto the air/aqueous and aqueous/hydrophobic solid interfaces of the drop. At the contact line at which these interfaces meet, conventional surfactants with a linear…
Terminal-functionalized polyesters and triblock polyesters were synthesized by lipase-CA-catalyzed ring-opening polymerization of seven-membered ring lactones, i.e., 1,5-dioxepan-2-one (DXO) and ε-caprolactone (CL), in the bulk in the presence of an appropriate alcohol that acts as an initiator. To introduce a double…
Using molecular dynamics computer simulations, we investigate the structural and dynamical properties of a simple model for a colloidal gel at low volume fraction. We find that at low T the system forms an open percolating cluster, without any sign of phase separation. The nature of the relaxation dynamics strongly de…
Monodisperse silver nanodisks are synthesized on the gram scale from a well-characterized layered silver thiolate precursor via thermolysis at 180-225 degrees C under a N(2) atmosphere. XRD, TEM, HRTEM, and AFM analyses indicate that the nanodisks generated at 180 degrees C over 2 h have an average diameter of about 1…
The proteomic profiles of several Clostridium acetobutylicum strains were compared by two-dimensional gel electrophoresis and mass spectroscopy. The proteomic profile of C. acetobutylicum wild type strain ATCC 824 with and without a commonly used control plasmid and with a spo0A overexpression plasmid pMSPOA was compa…
Three linear polyethylenes with branches at every 21st backbone atom have been analyzed by differential scanning calorimetry (DSC) and quasi-isothermal, temperature-modulated DSC. The branches were methyl (PE1M), dimethyl (PE2M), and ethyl groups (PE1E). Linear polyethylene (HDPE) and atactic poly(octadecyl acrylate)…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTDirect Visualization of Hyaluronic Acid Polymer Chain by Self-Assembled One-Dimensional Array of Gold NanoparticlesHaeshin Lee, Seung Ho Choi, and Tae Gwan ParkView Author Information Department of Biological Sciences, Korea Advance…
We report on the formation of responsive surfaces with tailorable surface reconstruction kinetics and switching hysteresis by thiolene radical addition of mercaptoalkanols with variable lengths to poly(vinylmethylsiloxane) networks. Exposing these elastomer surfaces to water results in rearrangement of the hydrophilic…
Three-dimensionally ordered macroporous (3DOM) carbon/titania nanoparticle composites were prepared in a program aimed at developing methods for assembling integrated multifunctional porous materials. The host material, 3DOM carbon, was synthesized by colloidal crystal templating with poly(methyl methacrylate) spheres…
Block copolymers containing a chemically degradable block are versatile precursors to nanoporous organic materials. Most work in this area has been accomplished in thin films. However, high surface area catalysis, separations, and nanotemplating can require monolithic samples with macroscopic pore volumes. Only a few…
A large-scale lambda-DNA network on a mica surface was successfully fabricated with a simple method. Silver nanoparticles capped with the cationic surfactant cetyltrimethylammonium bromide (CTAB) were self-assembled onto a two-dimensional DNA network template by electrostatic interaction and formed nanoporous silver f…
From simple pocket calculators, to mobile telephones and LCD-TV, over the past few decades devices based on liquid crystal display technology have proliferated into just about all conceivable aspects of everyday life. Although used in cutting-edge technology, it is surprising that a vital part in the construction of s…
This paper reports the development and testing of atomistic models of silica MCM-41 pores. Model A is a regular cylindrical pore having a constant section. Model B has a surface disorder that reproduces the morphological features of a pore obtained from an on-lattice simulation that mimics the synthesis process of MCM…
Since the layer-wise polyelectrolyte deposition offers the opportunity to modify surfaces for biomedical applications, interactions and toxicity between polyelectrolytes and living cells become interesting. The aim of the present work is to determine the different factors such as contact area, charge, and transplantat…