Materials Literature
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While we are all familiar with liquid crystal displays, an industry currently worth more than US dollars 60 billion yr(-1) and growing rapidly, fewer people are aware of the breadth of the subject of liquid crystals--one that represents the study of the fourth state of matter. Liquid crystals are found as essential el…
CdS nanoparticles (NPs) functionalized with nucleotides were used to assemble layered NP arrays stabilized by H bonds (see scheme). The association of various nucleotides between the NPs and electrode, with subsequent sequential nucleotide linkages, allows control of the number of layers. The nucleotide-crosslinked Cd…
Zn 1 − x Mg x O nanoneedles were prepared by an ion-beam technique on Zn1−xMgxO thin films with Mg contents of up to 21at.%. The photoluminescence emission energies of the Zn1−xMgxO nanoneedles measured at room temperature increased monotonically with Mg contents and it reached 3.6eV when x=0.21. Random laser action w…
The formation energy of misfit dislocations in a ferroelectric thin film grown on compliant substrate is calculated based on the Landau-Devonshire formalism and Timosheko’s method for thermal stresses. The critical thickness is shown to change significantly according to the polarization in the film, leading to serious…
We measured the angular dependence of the 0th, +/-1 st, and +/-2 nd optical diffraction orders from a 50 microm thick transmission grating recorded in a UV-curable holographic polymer-dispersed liquid crystal (HPDLC) made from commercially available constituents. The analysis was performed for two orthogonal polarizat…
It is well known that surface roughness always enhances wetting for hydrophilic, but drying for hydrophobic surfaces. In this letter, the authors found that La0.7Sr0.3MnO3 coatings display distinct wettability from superhydrophilicity to superhydrophobictiy, which is tuned by their hierarchical microstructures obtaine…
Abstract The synthesis of a series of compounds containing the photochromic mononitrosyl cation, [RuNO(NH 3 ) 5 ] 3+ and metal complex paramagnetic anions [M(CN) 6 ] 3– [M = Cr ( 1 ), Fe( 2 )], [M(ox) 3 ] 3– [M = Cr( 3 ), Fe( 4 )] and [CrNO(CN) 5 ] 3– ( 5 ) is reported. The crystal structures of the salts 1 and 3 are…
Highly luminescent Si quantum dot embedded SiO x films were studied as down-converting emitters for solid-state lighting applications. Strong red photoluminescence was observed from these Si nanocrystal embedded films prepared by thermal evaporation of SiO in vacuum or an O 2 atmosphere followed by anneal at 1100 °C.…
Gelation is a common effect in aqueous suspensions of charged colloidal clay platelets at concentrations as low as 1 wt%. However, in systems of charged gibbsite [Al(OH)3] platelets, gelation can be delayed to concentrations as high as 50 wt% depending on the ionic strength. We investigated the phase behaviour of this…
The authors report the fabrication of grain-aligned [Ca2CoO3−δ]0.62CoO2 (Ca349) thick films and a multilayered thermoelectric unicouple of Ca349 and Ca0.9La0.1MnO3−δ (Mn113) using electrophoretic deposition (EPD) and magnetic alignment methods. Strongly c-axis-oriented Ca349 thick films were obtained by EPD performed…
Direct synthesis of single-walled carbon nanotubes (SWNTs) bridging prepatterned Mo electrodes has been achieved using laser-assisted chemical vapor deposition (LCVD). The synthesized SWNTs are found predominantly semiconducting. By controlling the spot size of the focused laser beam, synthesis of SWNTs can be achieve…
Adenoviral vectors are extensively used as gene-delivery vehicles in gene therapy. They are usually produced by HEK-293 cell (human embryonic kidney-293 cell) culture, which requires specially formulated serum-free medium, the cost of which is considerable or by supplementation with FBS (fetal bovine serum). The risk…
Steady‐state compressive creep rate of La 0.5 Sr 0.5 Fe 0.5 Co 0.5 O 3−δ (LSFC) and La 0.5 Sr 0.5 CoO 3−δ (LSC) is reported in the temperature region 900°–1050°C and stress range 5–28 MPa. The stress exponents for the two materials were 1.71±0.18 and 1.24±0.15, respectively. The activation energy for creep was conside…
A series of star poly(epsilon-caprolactone)s (PCL) with dendritic cores, PAMAM-PCLs, were synthesized through the ring-opening polymerization of epsilon-caprolactone (CL) initiated by poly(amidoamine) dendrimer (PAMAM-OH). By controlling the feed ratio of the macroinitiator PAMAM-OH to the monomer CL, the star polymer…
Abstract Polyelectrolyte complexes (PECs) have been prepared from well‐defined (quaternized) poly[2‐(dimethylamino)ethyl methacrylate] (PDMAEMA) and high molecular weight poly(2‐acrylamido‐2‐methylpropane sodium sulfonate) (PAMPSNa) after a thorough study of their viscometric properties. The effect of pH and quaterniz…
The penultimate step in the biosynthesis of riboflavin (vitamin B2) involves the condensation of 3,4-dihydroxy-2-butanone 4-phosphate with 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione, which is catalyzed by 6,7-dimethyl-8-ribityllumazine synthase (lumazine synthase). Pathogenic Brucella species adapted to an intr…
Epitaxial thin films composed of 0.7FeTiO3∙0.3Fe2O3 solid solution have been prepared on α-Al2O3 (0001) substrates by a pulsed laser deposition method, and their electrical and magnetic properties have been examined. A single phase of the ordered phase can be obtained under limited deposition conditions: oxygen partia…
This letter reports the direct optical observation, i.e., without polarization, of the magnetic domain structure explained by a large surface relief in Ni–Mn–Ga martensite. The authors suggest that the relief is due to the different straining of the surface and the bulk caused by the internal stresses associated with…
Crystalline ceramic powders of Er3Al5O12 were obtained by low temperature direct combustion synthesis. Irradiating the sample with a low-power continuous-wave infrared (1.48μm) diode laser led to ultraviolet, violet, blue, green, and red (380, 410, 456, 495, 525, 550, and 660nm) emissions. The strong upconversion lumi…
Both transient and persistent photoconductivities (abbreviated to TPC and PPC, respectively) are observed in oxygen-deficient La2∕3Sr1∕3MnO3−δ thin films at low temperatures. The magnitudes of TPC and PPC are 7.6% and 6.08%, respectively, with light density of 4.35mW∕cm2 at 50K. Moreover, a small magnetic field can er…