Materials Literature
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Abstract Using differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and Fourier transformed infrared spectroscopy (FTIR), upper critical solution temperature (UCST) phase behavior with immiscibility–miscibility transformation in blends of poly(ethylene succinate) (PESu) with poly(lactic acid)s…
Abstract A novel nucleating agent (TBC8‐t), self‐assembled with p ‐ tert ‐butylcalix[8]arene (TBC8) and toluene, was used to manipulate the crystallization behavior of poly( L ‐lactic acid) (PLLA). Toluene molecules were used to adjust the crystallization structure of TBC8. Differential scanning calorimetry results sh…
A series of polyallylcarbosilane dendrimers and carbosilane-based dendritic polyols up to third generation was analyzed by means of matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry and multinuclear NMR spectroscopy to determine the character, origin, and number of structural def…
Rod-shaped mesogenic hydrazide (series I) derivatives have been synthesised by the Schotten-Baumann reaction of 4-chlorobenzhydrazide with 4-n-alkoxybenzoyl chloride using pyridine as a solvent. Rod-shaped mesogenic hydrazide (series I) have been cyclised to bent-shaped mesogenic oxadiazole (series II) and thiadiazole…
In this paper we report the results from detailed electro-optical and dielectric studies in various antiferroelectric and ferroelectric phases of an orthoconic antiferroelectric liquid crystal (OAFLC) material . The material possesses high tilt and high spontaneous polarisation. Such an OAFLC, because of its high tilt…
A glycine occurs at every third residue in the X-Y-Gly repeat of natural collagen. Replacing Gly residues destabilizes collagen and is often associated with many diseases. We present a comprehensive study on the thermodynamic and kinetic consequences of replacing Gly residues at different sites in collagen. For this,…
The exploration of novel synthetic methodologies that control both size and shape of functional nanostructures opens new avenues for the functional application of nanomaterials. Here we report a new and versatile approach to synthesize single crystalline oxides nanorods: thermal conversion from amorphous oxides nanopa…
Chiral propane-1,2-di-(4-(4-heptylcyclohexyl)benzoate) (PPCB) and 1-phenylethane-1,2-di-(4-(4-heptylcyclohexyl) benzoate) (PEPB) were synthesised and used as chiral dopants to induce chiral nematic liquid crystals (N*-LCs). Since the helical twisting power of the former first decreased and then increased as a result o…
Galactitol 2-dehydrogenase (GatDH) belongs to the protein superfamily of short-chain dehydrogenases. As an enzyme capable of the stereo- and regioselective modification of carbohydrates, it exhibits a high potential for application in biotechnology as a biocatalyst. We have determined the crystal structure of the bina…
The growth of silver nanoparticles in mesostructured hybrid silica films under laser illumination is investigated by optical absorption spectroscopy and transmission electron microscopy. At low laser doses in the UV range, a blue-shift of the plasmon resonance is observed for increasing particle size. This size depend…
Microbial Induced Corrosion (MIC) consists of microorganisms that through their biological processes, cause metallic elements to corrode at an accelerated rate. Cases have been documented were MIC has accelerated corrosion by as much as 10 times the normal rate. At this rate, structures could be left in an un-repairab…
The phase behaviour of a homologous series of thermotropic cubic mesogens of 1,2-bis(4'-n-alkoxybenzoyl)hydrazines (BABH-n, where n is the number of carbon atoms in both terminal alkoxy chains, ranging from n = 11 to n = 18) was studied under hydrostatic pressure using a polarising optical microscope (POM) equipped wi…
Empirical equations describing the electrical conductivities of fluorides and fluoride−oxide mixtures have been obtained. These equations are based on two suppositions: (a) electrical conductivity of ionic molten substances is connected with the electronic structure of the cations; (b) the electrical conductivity of i…
Mesomorphic properties of three-ring systems such as 2,5-dibenzoyloxytropones, 5-benzoylamino-2-benzoyloxytropones and 2,5-dibenzoylaminotropones with 4-alkoxy, 3,4-dialkoxy, and 3,4,5-trialkoxy groups on the benzoyl groups were investigated together with those of the corresponding benzenoids. Derivatives with two mon…
Two novel liquid crystals containing terminal imidazole groups (Imi-COOH and Imi-DAH) were designed and synthesised. Imi-COOH exhibits a high-temperature monotropic smectic mesophase that is substantially stabilised by hydrogen bonding between acid and imidazole end-groups. Despite its rigid diacylhydrazine core, whic…
Abstract The influence of phosphate (and its concentration) on the electrochemical properties of anodic porous oxide films formed on titanium surfaces in fluoride containing electrolyte was investigated by performing electrochemical measurements [potentiodynamic/potentiostatic polarization, open circuit potential (OCP…
Abstract Multiwalled carbon nanotubes (MWCNTs) were oxidized using four different acid‐treatment methods followed by their functionalization with 3‐aminopropyltriethoxysilane (3‐APTES). Diglycidyl ether of bisphenol A (DGEBA) nanocomposites with unmodified and silanized MWCNTs (0.2 wt %) were prepared by a cast moldin…
Abstract High temperature sulfidic corrosion has caused safety and reliability issues in refinery units for decades. The objective of the work was to investigate the kinetics of sulfidation under refinery conditions and to characterize, at the nanometer scale, the sulfide layers formed on different steels. The experim…
Substituting Mn ions in PrMnO3 by 3d-transition metal Fe ions, the structural, magnetic and magnetotransport properties are modified due to change in tolerance factor. The compound has an orthorhombic structure with the space group Pbnm. The field cooled magnetization data with temperature indicates that the compound…
Carbon materials, including carbon nanotubes and nanostructured diamond, have been investigated for over a decade for application to electron field emission devices. In particular, they have been investigated because of their low power consumption, potential for miniaturization, and robustness as field emission materi…