Materials Literature
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Microscale wide and millimeters long comblike ZnO single crystals with well-aligned cuboid nanobranches were fabricated using a double-tube simple thermal evaporation method without the presence of a catalyst at 950 °C. X-ray diffraction and Raman spectra revealed that the as-grown products had a wurtzite crystal stru…
This review summarizes the achievements obtained by making use of molecular dynamics (MD) simulations in the elucidation of the structure of multicomponent glasses exerting bioactive properties. Emphasis on critical aspects of MD simulations for oxide glasses treatment is given. The potentiality of the quantitative st…
A new soft-chemical transformation of layered perovskite oxides is described wherein K 2 O is sequentially extracted from the Ruddlesden−Popper (R−P) phase, K 2 La 2 Ti 3 O 10 ( I ), yielding novel anion-deficient KLa 2 Ti 3 O 9.5 ( II ) and La 2 Ti 3 O 9 ( III ). The transformation occurs in topochemical reactions of…
Abstract In a Raman map of double‐wall carbon nanotubes, the radial breathing modes of the inner tubes are grouped into clusters with similar resonance behavior. These clusters are located close to the resonances of SDS wrapped HiPco tubes and can spread over 30 cm –1 . Compared to the HiPco tubes the resonances of th…
Based on the polaron concept, a general nonperturbative approach to the calculation of the multiphonon Raman scattering cross section for semiconductor quantum dots (QDs) is proposed. Within this concept, the Raman scattering process consists of two virtual transitions in the exciton-polaron spectrum, one with absorpt…
Abstract In this study, an oriented, strong and transparent multiwall carbon nanotube sheet is used as the hole collecting electrode in polymer solar cells with RR‐P3HT as the donor material and PCBM as the acceptor material. An open circuit voltage of 0.49 V, a short circuit current of 5.47 mA/cm 2 , a fill factor of…
The chiral supramolecular complexation between amylose and oligosilane can be reversibly controlled by changing the pH, leading to a switching of the optical activity. Further, the induction of optical activity in oligosilane, synchronized with the supramolecular complexation, is reversible, as shown by data from pH c…
Abstract In this contribution we present detailed studies of single walled carbon nanotubes (SWNTs) in water surfactant dispersions separated by size exclusion chromatography. We investigated length separated SWNT fractions by AFM, absorption spectroscopy and near‐infrared photoluminescence mapping. The ultrasonic ind…
Abstract Flexible, transparent and conducting poly(methyl methacrylate) (PMMA) composites films were prepared using SOCl 2 functionalized SWNTs. Optical absorption spectra measured on composite films confirm that the composite preparation procedure preserves the electronic properties (position of the Fermi level) of t…
${\mathrm{Mn}}_{2}{\mathrm{O}}_{3}$ nanocrystals have been grown in a silica matrix following the sol-gel route and subsequent calcination at various temperatures in the range $700\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}--900\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}…
Abstract Carbon nanotubes can be aligned by dispersing them in a liquid crystalline matrix. To control and optimize the obtained alignment it is important to understand the interactions between the molecules of the liquid crystal host phase and the carbon nanotubes. To this end we have carried out resonant Raman spect…
Excellent control of the thin-film microdomain orientation of lamellar- (LAM) and cylinder- (CYL) forming ultrahigh molecular weight block copolymers has been obtained over a large area via directional solidification of a crystallizable solvent. 3D optical imaging of the microdomains via laser scanning confocal micros…
Abstract A large variety of functional groups (i.e. carboxyl, carbonyl, aldehyde, alcohol) – representing the different oxidation states of carbon – can be produced by oxidative treatment of single walled carbon nanotubes (SWCNTs), depending on duration and temperature of the process. For subsequent functionalization…
Recent research has shown that a phase transformation of diamond to a different form of carbon is involved when diamonds are polished in the traditional fashion. The question as to how this phase transformation is activated and maintained to produce high wear rates is of great technological interest since it may radic…
Abstract Summary: The phase relaxation behavior of chitosan and its blends with glycerol has been studied by dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) techniques. The analysis of DMTA spectra of chitosan leads to recognition of two molecular relaxations in chitosan and its…
Carbon nanotubes will only have a significant impact when they can be produced with uniform properties.
Aqueous solutions of poly(ethylene glycol) (PEG) of mean molecular mass of 600 g/mol (PEG600) are investigated by Brillouin scattering technique. At high PEG content, a relaxation phenomenon is observed, which is related to a local rearrangement of the polymer structure where the interaction, via hydrogen bonding, wit…
Ba 4 YMn 3 O 11.5, a 12R hexagonal perovskite that consists of face-sharing Mn 3 O 12 trimers isolated by single YO 6 octahedral layers, is presented. The presence of locally 5- and 6-coordinated Y 3+ and Mn 4+ cations is observed in this structure. A high dielectric permittivity (ε r ≈ 1 × 10 4 ), which is almost fre…
The purpose of this paper was to compare physical properties of conventional particleboard bonded with amounts of UF and PMDI resin and to examine the effect of mat moisture content (MC), wax content and platen temperature on their bonding efficiency, as determined by internal bond strength. It was found that PMDI not…
Abstract The massless Dirac particle moving at the speed of light has been a fascinating subject in relativistic quantum physics. Nanoscale graphitic materials, such as carbon nanotubes and graphene, now provide us with an opportunity to investigate such exotic effects in low‐energy condensed matter systems. The uniqu…