Materials Literature
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We report on the synthesis of phosphonic acid functionalized mesoporous organosilicas (MES-PA) with bimodal nanostructure by a postsynthesis treatment method. Phosphonate ester functionalized mesoporous organosilicas (MES-P) were first synthesized by one-step cocondensation of 1,2-bis(trimethoxysilyl)ethane (BTME) and…
We have used the pair distribution function (PDF) method to gain insight into the mechanism of contraction of zeolite chabazite. Using this method we followed how the interatomic distances of the local structure changed with temperature. By optimization of the structure by free energy minimization and using the Revers…
The amorphous calcium carbonate (ACC) hemispheres were deposited on the mica and poly(diallyldimethylammonium chloride) modified surface. The form of the ACC deposit on the substrates can be controlled by modifying the substrate surface, the introduction of additives, or both. It demonstrated that substrates (insolubl…
Abstract After investigating the effects of the interior wall of the micro-capillary tube on the size distribution of silver nanoparticles, the well dispersed silver nanoparticles were fabricated continuously in a selected PTFE micro-capillary reactor with a one-step process.
Porous ceramics are of great interest for filtration, catalysis, and reactive separation processes. Performance in these applications is highly dependent on features such as pore size distribution and connectivity and wall composition. Here, we describe a method allowing the rational design and synthesis of mesoporous…
High-field electron paramagnetic resonance spectra were collected at several frequencies for a single crystal of [Zn3.91Ni0.09(hmp)4(dmb)4Cl4] (1), where dmb is 3,3-dimethyl-1-butanol and hmp- is the monoanion of 2-hydroxymethylpyridine. This crystal is isostructural to [Ni4(hmp)4(dmb)4Cl4] (2), which has been charact…
A dynamic self-assembling process is reported which involves drying a droplet of positively charged colloidal suspension on a flat negatively charged hydrophilic surface. This extremely simple method affords lines of colloidal particles with regular 1.5-4.5 microm line spacing and smaller than 2 microm line width over…
The structure of hexanuclear 6-methyl-2-pyridinethiolato copper(I) [Cu6(6-mpyt)(6)] crystals has been studied by the X-ray diffraction analysis. These crystals show highly efficient luminescence whose color changes drastically from red to green-blue with lowering temperature from room temperature (RT) to liquid nitrog…
The development of a new family of colloidal dispersions that exhibit nonspherical shapes and are capable of forming stable polymeric dispersions and films is reported. Heptadecafluorodecyl methacrylate (FMA), heptadecafluorodecyl acrylate (FA), heptadecafluoro-1-decene (FD), heptafluorobutyl acrylate (FBA), and hepta…
In considering the relaxation of segments in a blend whose components have reasonably disparate glass transition temperatures, local concentration fluctuations and density fluctuations each play a role. The result is a distribution of environments around a given segment in the blend, which translates into a distributi…
The effect of molecular weight distribution on microphase-separated structures for both AB diblock and BAB triblock copolymers was investigated in comparison with that of composition distribution. Monodisperse poly(styrene- b -2-vinylpyridine) (SP) and poly(2-vinylpyridine- b -styrene- b -2-vinylpyridine) (PSP) parent…
We report on the successful synthesis of silver sulfide (Ag(2)S) nanowires by a simple and mild gas-solid reaction approach. For the nanowire synthesis, a preoxidized silver substrate is exposed to an atmosphere of an O(2)/H(2)S mixture at room temperature or slightly above. The resulting Ag(2)S nanowires are phase pu…
We report the study on the unique driving forces of the self-assembly of fully hydrophilic, soluble {Mo72Fe30} macroanions into single-layer, vesicle-like "blackberry" structures in water and mixed solvents. The hydrophobic interaction that is responsible for the vesicle formation of amphiphilic surfactants does not c…
We demonstrate an alternative path for achieving high transconductance organic transistors in spite of relatively large source to drain distances. The improvement of the electronic characteristic of such a scheme is equivalent to a 60-fold increase in mobility of the underlying organic semiconductor. The method is bas…
This paper compares and contrasts, for the first time, one- and two-component gelation systems that are direct structural analogues and draws conclusions about the molecular recognition pathways that underpin fibrillar self-assembly. The new one-component systems comprise l-lysine-based dendritic headgroups covalently…
(-)-Menthide, a seven-membered lactone derived from the natural product (-)-menthol, was polymerized using a structurally defined zinc-alkoxide catalyst to form an aliphatic polyester. The polymer was fully characterized by NMR spectroscopy, size exclusion chromatography, and matrix-assisted laser desorption ionizatio…
Numerous studies have demonstrated the bottom-up assembly of complex structures such as colloidal crystals, close-packed aggregates, and even rings and tetramers. In this paper we produce a simple localized and nanoscale charge distribution on the surfaces of individual colloidal microspheres using our technique of "p…
An aggregate of exfoliated HNb3O8 nanosheets obtained by exfoliation of a layered metal oxide functions as a strong protonic solid acid, exhibiting much higher catalytic performance for esterification and hydrolysis than conventional niobic acid, Nb2O5·nH2O.
The swelling behavior of poly(methacrylic acid) (PMAA) brushes in contact with aqueous solutions of sodium, silver, alkaline-earth metal, copper, and aluminum nitrate was studied by multiple angle null ellipsometry. Fundamentally different swelling behavior were found for the interaction of the polyacid brush with met…
Changes in a Au/TiO(2) catalyst during the activation process from an as-prepared state, consisting of supported AuO(x)(OH)(4-2x)(-) species, were monitored with X-ray absorption spectroscopy and FTIR spectroscopy, complemented with XPS, microcalorimetry, and TEM characterization. When the catalyst was activated with…