Materials Literature
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Collagen self-assembly of silver-line grunt type I collagen solution was done at a concentration of 1 mg/mL and at pH 5, 6, 7 and 8 with incubation temperatures of 25, 30 and 35C. The self-assembly of collagen showed typical sigmoid curves and had a short lag phase at pH 5, 6, 7 and 8. The lowest absorbance was found…
Abstract Modeling and simulation at different scales were used to study mass transport and residence times of particles in nanostructured membranes with uniform cylindrical pores of 10–150 nm diameter and up to 5 μm long. Analytical equations of the possible mass‐transport mechanisms inside the pores were used to dete…
We report the functionalization of individual ultra-short (20–80 nm lengths) single-walled carbon nanotubes (US-tubes) via in situ Bingel cyclopropanation. Upon chemical reduction (K°/THF) of bundled US-tubes, the bundling forces are electrostatically overcome to yield single, negatively charged US-tubes in solution.…
Magnetoelectric compounds BiFe 1− x Ti x O 3 ( x = 0.1, 0.2 and 0.3) have been synthesized by the conventional solid state reaction method and the effect of Ti substitution on the ferroelectric and magnetic properties studied. It is seen that Ti substitution does not affect the ferroelectric transition temperature ( T…
First-principles calculations are performed to study the interaction of cluster Au(32) with small molecules, such as CO, H(2), and O(2). The cagelike Au(32)(I(h)) shows a higher chemical inertness than the amorphous Au(32)(C(1)) with respect to the interaction with small molecules CO, H(2), and O(2). H(2) can only be…
Modellierung der Enzymkatalyse: Ab-initio-QM/MM-Rechnungen auf hohem Theorieniveau ergaben Werte für die Aktivierungsenthalpien und die freien Aktivierungsenergien der Chorismat-Mutase und der para-Hydroxybenzoat-Hydroxylase, die hervorragend mit experimentellen Daten übereinstimmen. Die Enzymreaktivität kann mithilfe…
We report here the syntheses and the photolytic properties of 3-(4,5-dimethoxy-2-nitrophenyl)-2-butyl (DMNPB) esters as new photoremovable groups for carboxylic acids, and their use for the caging of L-glutamate. A high-yielding synthesis of the DMNPB esters led to a 4:1 threo/erythro diastereomeric mixture, which cou…
meso-Heptakis(pentafluorophenyl) heptaphyrin(1.1.1.1.1.1.1) (1) was prepared by a stepwise route in 39 % yield and its unique N-fusion reaction (NFR) sequence has been revealed; this reaction leads to singly-, doubly-, and quadruply N-fused heptaphyrins (4, 5, and 6) in good yields. These transformations are facilitat…
An instrument for Coulometric-titration measurements was built and used to measure the thermodynamic redox properties for a 10 wt % Cu/silica catalyst at 973 K and for two ceria−zirconia solid solutions, Ce 0.81 Zr 0.19 O 2 and Ce 0.25 Zr 0.75 O 2, between 873 and 1073 K. For Cu/silica, the equilibrium data show two w…
The adsorption of atomic and molecular hydrogen on carbon-doped boron nitride nanotubes is investigated within the ab initio density functional theory. The binding energy of adsorbed hydrogen on carbon-doped boron nitride nanotube is substantially increased when compared with hydrogen on nondoped nanotube. These resul…
The relative spacing of amines in 3-aminopropylsilyl-grafted silica is studied by solid-state fluorescence spectroscopy of 1-pyrenecarboxylic acid (PCA) and 1-pyrenebutyric acid (PBA) bound to traditionally prepared, deprotected benzyl- or deprotected trityl-spaced aminosilicas. Thermogravimetric analysis and FT-Raman…
We report on a theoretical study of quantum transport in carbon nanotubes in the presence of chemical-disorder-induced quasibound states, with a quantitative analysis of the relationship between the energy-dependent elastic mean free path and localization length. An external magnetic field applied perpendicularly to t…
We have studied the structural and optical properties of four 2,5-diphenyl-1,4-distyrylbenzene derivatives with all cis double bonds. These compounds belong to a class of nonplanar conjugated compounds possessing a typical Aggregation-Induced Emission (AIE) property that has no emission in solution but intense emissio…
We study the effect of a constant electrical field applied on vicinal surfaces such as the Si$(111)$ surface. An electrical field parallel to the steps induces a meandering instability with a nonzero phase shift. Using the Burton-Cabrera-Frank model, we extend the linear stability analysis performed by Liu, Weeks and…
A detailed characterization of large-pore cagelike mesoporous SBA-16 silica materials with tailored pore dimensions is reported. The materials were synthesized in a EO 106 PO 70 EO 106 (F127)−butanol−H 2 O system under mildly acidic conditions, and the pore diameters were tailored by varying the hydrothermal treatment…
A general and facile approach has been developed to prepare various metal oxide nanocrystals from commercially available metal acetate precursors using an amine-mediated reaction. The influence of temperature and capping agents on the yield and final morphology of the metal oxides nanocrystals was investigated. The ap…
This paper presents a study on the synthesis and characterization of ZnO nanoparticles by a two-step synthesis procedure. The first step is the solution-free mechanochemical synthesis of ZnC2O4?2H2O nanoparticles by grinding a powder mixture of Zn(CH3COO)2 and H2C2O4?2H2O at room temperature for a certain time. The se…
The complexes [Pt(bipy){CC-(4-pyridyl)}(2)] (1) and [Pt(tBu(2)bipy){CC-(4-pyridyl)}(2)] (2) and [Pt(tBu(2)-bipy)(CC-phen)(2)] (3) all contain a Pt(bipy)(diacetylide) core with pendant 4-pyridyl (1 and 2) or phenanthroline (3) units which can be coordinated to {Ln(diketonate)(3)} fragments (Ln = a lanthanide) to make c…
We have undertaken a study of the diluted magnetic semiconductors Ga 1− x Mn x N and Ga 1− x Cr x N with x = 0.0625,0.125, using the all-electron linearized augmented plane wave method (LAPW) for different configurations of Mn as well as Cr. We study four possible geometries of the impurity atoms in the wurtzite GaN s…
Polyurethane and Related Foams: Chemistry and Technology is an in-depth examination of the current preparation, processing, and applications of polyurethanes (PURs) and other polymer foams. Drawing attention to novel raw materials, alternative blowing agents, and new processing methods, the book accentuates recent inn…