Materials Literature
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Mesoporous silica films have been synthesized on borosilicate glass substrates under static conditions and continuous flow of the precursor surfactant−silicate mixture. Evidence for flow-induced orientation is provided. When films are grown under a flow field and for short deposition times, the tubular mesostructures…
Nanosized TiO2 was prepared using the sol–gel procedure. The prepared powder was thermally treated up to 1000°C. X-ray diffraction (XRD) measurements showed that the starting powder and the samples obtained after heating this powder up to 500°C were mixtures of anatase, as the dominant phase, and brookite. The crystal…
The protonation behavior of poly(propylene imine) dendrimers and some related oligo amines has been measured using natural abundance 15 N-NMR. The chemical shifts of the different shells of nitrogen nuclei as a function of pH have been directly interpreted as the degree of protonation for that shell. The thus obtained…
Thermal decomposition of ammonium dinitramide (ADN) has been studied by differential scanning calorimetry (DSC) and thermal gravimetry combined with mass spectrometry (TG−MS). ADN decomposes in the range 130−230 °C with an overall heat release of 240 ± 40 kJ mol -1 . The product gases have been identified by MS as NH…
A method to coat thin wires, 25 μm in diameter, with fluorocarbon material that is flexible and conformal has been achieved using pulsed plasma enhanced chemical vapor deposition (PECVD). This process enables the chemical composition of the films to be tailored in order to achieve similar stoichiometry and chemical co…
Polycationic high-spin states of 1,3-bis(diarylamino)benzene and 1,3,5-tris(diarylamino)benzene as prototypical model units for organic ferromagnetic metals have been studied by cw and pulsed ESR spectroscopy. An electron spin transient nutation (ESTN) method as a novel technique based on pulsed ESR spectroscopy has b…
In order to understand the effects of protein fouling during ultrafiltration of biological fluids, we have investigated the molecular interactions between a thin polysulfone film and hen egg lysozyme with the surface forces apparatus (SFA). The normalized forces between the adsorbed protein layers and polymer films we…
The synthesis of three triazamacrocycles containing the pyridine moiety and three acetate pendant arms (PCTA) is reported. The three systems differ due to the number of carbon atoms in the macrocyclic ring forming ligands PCTA-[12], -[13], and -[14], endowed with different coordination capabilities toward lanthanide(I…
Electron-beam deposition is used to fabricate free-standing carbon nanoelectrodes separated by a gap of less than 5 nm. Fabrication is carried out under direct visual control in an electron microscope. After coating the carbon electrodes with a thin metal film (e.g., AuPd) such structures can be used to study electric…
Abstract This paper describes research methodologies for the investigation of the mechanism of vulcanization and discusses the reactivity of thiuram and dithiocarbamate chemicals. The combined knowledge is subsequently applied to thoroughly review the mechanism and chemistry of both thiuram- and dithiocarbamate-accele…
In this study, mechanical properties of three types of polymeric foams (polypropylene (PP), polystyrene (PS), and polyurethane (PU) foams) are investigated. Focus has been placed on the strain rate and temperature effects on these foams under large deformations. Selected experimental results from uniaxial compression,…
A solvation and electrostatic model has been developed for estimating electrolyte adsorption from physical and chemical properties of the system, consistent with the triple-layer model. The model is calibrated on experimental surface titration data for ten oxides and hydroxides in ten electrolytes over a range of ioni…
This paper reports the results of hot-electron lifetime measurements in a series of thin films prepared by wet chemistry techniques from 12-nm colloidal Au nanoparticles. The films, which vary in thickness and domain (or aggregate) size, are studied by a combined approach of femtosecond optical spectroscopy and scanni…
To evaluate the biocompatibility of a newly developed degradable class of polyesterurethanes and their possible use as biomaterials, we investigated the cell and tissue interactions with these polymers using a small number of chemical base entities. The polymers were prepared by chain extension with diisocyanates of P…
A synthesis method is introduced for very small uniform gold particles (diameter less than 5 nm), based on the reduction of hydrogen tetrachloroaurate(III) in ethanol in the presence of (γ-mercaptopropyl)trimethoxysilane (MPS). The surface layer of MPS molecules gives the gold particles a high colloidal stability and…
The structures of different celluloses (microcrystalline and native) were characterized by diffuse reflectance infrared spectroscopy (DRIFT), analyzing the bands due to O−H stretching, C−O stretching, and C−H bending modes. The respective crystallinities were determined as 73 ± 2% and 40 ± 2%, and the crystalline stru…
Prolyl 4-hydroxylase (proline hydroxylase, EC 1.14.11.2) catalyzes the formation of 4-hydroxyproline in collagens. The vertebrate enzyme is an alpha2beta2 tetramer, the beta subunit of which is identical to protein disulfide-isomerase (PDI, EC 5.3.4.1). We report here on cloning of the recently discovered alpha(II) su…
Optical memory systems that exhibit multiplexity and multifunctionality may allow high‐density storage and multiple addressing and readout. In a first step towards such systems, it is shown that two‐component mixtures of dithienylethene compounds (e.g., see Figure) can be switched reversibly between four different col…
Polarizing beam splitters that use the anisotropic spectral reflectivity (ASR) characteristic of high-spatial-frequency multilayer binary gratings have been designed, fabricated, and characterized. Using the ASR effect with rigorous coupled-wave analysis, we design an optical element that is transparent for TM polariz…
From an experimental point of view and more particularly in heterogeneous catalysis, the L III white line is at the center of electronic charge transfer either between either the nanometer scale metallic particle and the support or between the two metals which are present inside the cluster. In this work, we show that…