Materials Literature
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Cold, noncrystalline states play an important role in understanding the physics of liquid water. From recent experimental and theoretical investigations, a coherent interpretation of water’s properties is beginning to emerge.
Nature is adept at controlling mineralisation processes to produce single crystals and polycrystalline and amorphous structures with remarkable morphologies and mechanical properties. Calcium carbonate is one of the most common biominerals, and as such has received considerable attention, both in terms of research int…
Shape memory alloys (SMA) are materials that have the ability to return to a former shape when subjected to an appropriate thermomechanical procedure. Pseudoelastic and shape memory effects are some of the behaviors presented by these alloys. The unique properties concerning these alloys have encouraged many investiga…
We review the use of kinetically constrained models (KCMs) for the study of dynamics in glassy systems. The characteristic feature of KCMs is that they have trivial, often non-interacting, equilibrium behaviour but interesting slow dynamics due to restrictions on the allowed transitions between configurations. The bas…
Carbon nanotubes are new members of carbon allotropes similar to fullerenes and graphite. Because of their unique electrical, mechanical, and thermal properties, carbon nanotubes are important for novel applications in the electronics, aerospace, and computer industries. Exposure to graphite and carbon materials has b…
A proton NMR method, based on simple Bloch-decay spectra in the solid state, is presented that enables one to follow, with excellent sensitivity, structural changes associated with aging in semicrystalline polymers whose T g is well below the aging temperature. The method is demonstrated for two representative isotact…
Isomorphous triclinic forms of dichloro[phthalocyaninato(2-)]tin(IV), [Sn(C(32)H(16)N(8))Cl(2)], and dichloro[phthalocyaninato(2-)]germanium(IV), [Sn(C(32)H(16)N(8))Cl(2)], and a monoclinic form of the latter have been obtained from the reaction of pure tin and germanium powder, respectively, with phthalonitrile under…
Self-assembled multilayers comprised of alternate layers of polyphenol oxidase (PPO) and poly(allylamine) (PAH) or PPO and poly(diallyldimethylamine) (PDDA), deposited on a 3-mercaptopropanesulfonic acid (MPS)-modified gold surface, were studied "in-situ" (under water) by means of ellipsometry and quartz crystal micro…
A review of methods for producing and using condensed melamine phosphates as flame retardants, and analysis of our own investigations on production of melamine polyphosphate, are presented. Physicochemical properties of obtained products are given including thermal properties (DTA, TG, and DSC). Effectiveness of actio…
This paper examines the wetting characteristics of porous polyethylene surfaces modified by exposure to reactive oxygen glow discharge gas plasma, through the direct measurement of the wicking properties of the modified material. It is well-known that oxygen plasma can be used to chemically alter the surface of polyet…
The oxidation products in acetonitrile of hexapyrrolylbenzene (HPyB) and hexakis(3-octylpyrrolyl)benzene (HOPyB), two star-shaped compounds consisting of 6-fold N -pyrrolyl-substituted benzenes, were characterized by MALDI-TOF. These products result from intramolecular coupling of pyrrolyl residues without dimer or po…
The formation of the high-temperature hexagonal modification of DyMnO 3 and nonexisting as bulk hexagonal EuMnO 3, GdMnO 3, and SmMnO 3 was observed on ZrO 2 (Y 2 O 3 ) (111) substrates at 900 °C due to epitaxial stabilization. HREM study reveals epitaxial growth of the hexagonal film of limited thickness depending on…
Zirconia nanoparticles doped with up to 50 mol % Al 2 O 3 were prepared by chemical vapor synthesis (CVS). XRD data of these powders were refined by Rietveld analysis. Doping with alumina decreases the fraction of the monoclinic ZrO 2 phase and stabilizes the tetragonal or cubic ZrO 2 phase, forming different ZrO 2 /A…
Capillary electrophoresis (CE) has been performed on polymer-stabilized bundles and sodium dodecyl sulfate (SDS) suspensions of high-pressure carbon monoxide (HiPco)-produced single-walled carbon nanotubes. Real-time Raman spectroscopy has been used for detection and characterization of the separation process. Radial-…
Two nanocomposite oxides, NiO/Co 3 O 4 and Fe 2 O 3 /Co 3 O 4, are considered. The nanocomposite oxides were obtained by wet impregnation and characterized by means of X-ray photoelectron spectroscopy (XPS), diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, X-ray diffraction (XRD), thermal analysis,…
This review deals with problems involved in creating and handling nanoparticles, as well as the integration of nanoparticles into various systems and the operation of such systems. The review analyses the chemical, electrical and magnetic properties of the three main elements of nanotechnologies, viz., clusters, nanot…
Chiral bis-porphyrins are currently the subject of intense interest as chiral receptors and as probes in the determination of structure and stereochemistry. To provide an improved framework for interpreting the circular dichroism (CD) spectra of bis-porphyrins, we have calculated the CD spectra of chiral bis-porphyrin…
Electron injection rates from Ru(dcbpy) 2 (X) 2 [X = 2NCS, 2CN, and dcbpy; dcbpy = 2,2‘-bipyridine-4,4‘-carboxylate] (called Ru535 or Ru N3, Ru505, and Ru470) to TiO 2 nanocrystalline thin films are examined as a function of adsorbate redox potential, pH of the solution, excitation wavelength, and solvent. For all thr…
The improvement in efficiency of a parametric array by nonlinear oscillation of micro-bubbles in water is studied in this paper. The micro-bubble oscillation can increase the nonlinear coefficient of the acoustic medium. The amplitude of the difference-frequency wave along the longitudinal axis and its beam patterns i…
A novel class of surfactants was prepared from the ionic exchange reaction of sodium montmorillonite (MMT) and a comb-branch shape of maleated polypropylene (MPP) derived copolymers consisting of pendent quaternary ammonium salts, polyoxyalkylene linkers, and a polypropylene (PP) backbone. The hybrid surfactant is com…