Materials Literature
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Current tissue engineering strategies focus on the replacement of pathologically altered tissues by the transplantation of cells in combination with supportive biocompatible scaffolds. Scaffolds for tissue engineering strategies in musculoskeletal research require an appropriate mechanical stability. In recent studies…
The diagnosis and treatment of cancer or tumor at the cellular level will be greatly improved with the development of techniques that enable the delivery of analyte probes and therapeutic agents into cells and cellular compartments. Organic and inorganic nanoparticles that interface with biological systems have recent…
Introduction: Branched macromolecules or dendrimers have provided a rich seam of research in terms of both innovative chemistry and applications.1-14 For example, dendrimers have been studied for use as low-dielectric materials,15 as templates for the growth of single-wall carbon nanotubes,16 as catalysts,17-19 and in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleChemical Sensors Based on Amplifying Fluorescent Conjugated PolymersSamuel W. Thomas, Guy D. Joly, and Timothy M. SwagerView Author Information Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 Cite this: Chem. Rev. 2007, 107, 4, 1339…
Emergence of large circular dichroism (CD) was found in liquid crystal twin dimers with azo linkages, nOAZmAZOn. The compounds with even m are of rod-shape and show the SmA phase, whereas those with odd m are of bent-shape and show the SmCA and BX phases. Right- and left-circular polarized light (CPL) irradiation in t…
The authors have investigated the temperature dependence of the ferroelectric, dielectric, and structural properties of 70%Pb(Mg1∕3Nb2∕3)O3–30%PbTiO3 thin films. Two critical temperatures were evidenced. The first one occurring around 410K corresponds to the bulk paraelectric-ferroelectric phase transition and the sec…
The durability of a liquid crystal (LC) modulator for use with a high power laser is measured at a wavelength of 808 nm. It is shown that the LC modulator can withstand a laser power density of 133 W cm−2. For a laser power density greater than 133 W cm−2 the phase transition is caused by the absorption of the materia…
Silver lithium niobate (Ag 0.9 Li 0.1 NbO 3 , ALN10) single crystals were grown by a slow cooling method without flux under oxygen flow. By optimizing growth conditions, the ALN10 crystals with sizes of ca. 30 mm cube were successfully grown. Its crystal symmetry was investigated by high energy X-ray diffraction, and…
We report the experimental verifications that the clean free surface of ferroelectric has an intrinsic electron/hole layer, which exists below the ferroelectric phase-transition temperature, by measuring the surface conduction of BaTiO 3 single crystals in ultra high vacuum. To our knowledge, the electrically controll…
A model combining multiple layer description and effective media approximation is developed for pyrometry in the case of thin film synthesis, in order to estimate the film property evolution along its thickness during the growth process in real time. The model is used to investigate optical properties of polycrystalli…
Vertically aligned carbon nanotubes (VA-CNTs) filled with Pd–Co nanocomposites on an Si substrate have been synthesized by microwave plasma-enhanced chemical vapor deposition. It was confirmed that adjacent Pd–Co nanocomposites in the VA-CNTs were compositionally separated. Most CNTs contained Co pillars on top; howev…
The magnetic alignment of organically modified montmorillonite platelets in magnetic fields is studied using small-angle x-ray scattering. When suspended in non-mesogenic solvents such as dodecanol the platelets are found to align parallel to the magnetic field due to the negative anisotropy of the magnetic susceptibi…
Träger machen den Unterschied: Die Untersuchung der partikelgrößen- und substratabhängigen Aktivität bei der elektrochemischen Oxidation von CO bietet eine Gelegenheit, den Ursprung der einzigartigen Aktivität von trägerfixierten Goldnanopartikeln in neuem Licht zu betrachten. Zudem hilft die Manipulation der katalyti…
It has been shown that exchange coupled composite (ECC) media exhibit a superior thermal stability to switching field ratio compared to conventional perpendicular media. However, optimal media designs have employed a low magnetization hard layer. A more physically achievable design may consist of replacing the hard la…
Abstract Nanoscale MolecularDiamond products (various diamondoid materials), obtained from petrochemical feedstocks, have been investigated as additives for polypropylene and polycarbonate. Three of the homologues of this family (diamantane, triamantane, and the [121]tetramantane isomer) have marginal effects on the t…
The nanocrystalline diamond films with different morphologies and roughness were synthesized by a bias-assisted hot filament chemical vapor deposition method. It was found that the nanocrystalline diamond film exhibited low-k dielectric properties with the increase of CH4 concentration during diamond deposition. The l…
The potential of a two-stage sintering technique as a low-cost and simple ceramic fabrication to obtain highly dense and pure barium titanate ceramics with small grain size was demonstrated in this study. Effects of designed sintering conditions on phase formation, densification, microstructure, and electrical propert…
The authors report the synthesis of multiwalled carbon nanotubes on transparent substrates by utilizing a diode laser to locally heat the catalysts to high temperature. Well-aligned bamboo-shaped multiwalled carbon nanotubes can be synthesized on glass substrate covered with a carbon black layer. If the carbon black w…
Boron carbide (B 12 C 3 ) and boron phosphide (B 12 P 2 ) have the similar structures to α-rhombohedral boron (α-B 12 ) and are considered to be derivative crystals of it. The peculiar bonds in these two derivative crystals are visualized by MEM/Rietveld analysis, which involves a combination of the maximum entropy me…
Auger recombination, quantized Auger rate, and intraband absorption of two-photon-excited carriers in colloidal CdSe quantum dots have been investigated systematically with femtosecond Z scans and transient absorption measurements. The Auger constant is revealed to be on the order of 10−30cm6s−1, while the intraband a…