Materials Literature
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The effect of ultrasonic treatment on the crystallinity and activity of platinum nanoparticles is demonstrated. Preformed platinum nanoparticles stabilized with citrate ions were ultrasonically modified in water, poly(vinylpyrrolidone) aqueous solution, and ethylene glycol solution. The rapid heating/cooling cycles of…
A series of nanostructured ferroelectric thin films of barium strontium titanate were fabricated using a pulsed laser deposition system with real-time in situ process control. Pulsed laser deposition parameters were controlled during the growth of nanostructured thin films for use in the development of high frequency…
In die richtigen Bahnen lenken lassen sich nach den Befunden von Manners et al. Reaktionen von Boranen unter homogener Katalyse. Dabei entstehen aus Addukten primärer Amine mit Boranen lösliche Aminoboran-Polymere und -Copolymere (siehe Schema; pocop=ϰ3-1,3-(OPtBu2)2C6H3). Solche metallkatalysierten Dehydrokupplungen…
Conducting polymers are an attractive class of materials that combine the general properties of traditional organic polymers with the electrical conductivity of metals or semiconductors. They have potential applications in electrochromics, (1) supercapacitors, (2) antistatic and electrostatic coatings, (3) light-emitt…
Polycrystalline Nd1−xAgxMnO3 compounds were prepared in single-phase form up to 20% of Ag doping. They are found to crystallize in the Pbnm space group with an increase in lattice parameters with doping. The magnetic properties were studied by measuring dc magnetization and ac susceptibility. A paramagnetic to ferroma…
We numerically study the condensed phases of repelling core-softened spheres confined to a planar cell at the crossover from two to three dimensions. In the related experiment presented in Osterman et al (2007 Phys. Rev. Lett. 99 248301) the dipolar interaction between superparamagnetic spheres trapped in a thin cell…
Experiments in bulk water confirm the existence of two local arrangements of water molecules with different densities, but, because of inevitable freezing at low temperature $T$, can not ascertain whether the two arrangements separate in two phases. To avoid the freezing, new experiments measure the dynamics of water…
Abstract Here, we report the synthesis and characterization of new soluble polyimides that are functionalized using carbazole moieties in their side chain. As a monomer for synthesizing the polyimides, 4″‐carbazole‐9‐yl‐[1,1′;2′,1″] terphenyl‐4‐4′‐diamine and 2‐(3‐carbazol‐9‐yl‐propyl)‐biphenyl‐4,4′‐diamine were synth…
One of the challenges in soft and condensed matter over the last few years has been understanding the phenomena of glass and jamming transitions. A recent advance in the field is the idea that the dynamical heterogeneities play here the same role as the critical fluctuations in ordinary critical phenomena. This is due…
In this paper, we investigated carbon nanotube FETs (CNT FETs) utilizing semiconducting single-walled CNTs (SWCNTs). Multiple devices, each of different metal source and drain contacts, were fabricated on a single SWCNT. Over specific temperature regimes, transport properties of the devices were found to be consistent…
In this letter, we report on measurements of carbon nanotube (CNT) field-effect transistors with high on/off ratio to be used as nonvolatile memory cells operating at room temperature. Thousands of memory devices have been realized using a completeinsitufabrication method. The self-aligned fabrication process allows l…
The classical approach to prepare dithiocarbamate-functionalized silica involves a two-step procedure based on the reaction of carbon disulfide with a pre-formed amine modified silica sample. A novel approach is proposed here, involving the direct grafting of silica surfaces with the aid of a siloxydithiocarbamate pre…
Abstract Two one‐dimensional (1D) polynuclear iron(III) complexes, [Fe III (acacen)(bpyp)]BPh 4 ( 1 ) and [Fe III (acacen)(bimb)]BPh 4 ( 2 ), were synthesized [acacen = N , N′ ‐ethylenebis(acetylacetonylideneiminato); bpyp = 1,3‐bis(4‐pyridyl)propane; bimb = 1,4‐bis(imidazolyl)butane]. Complexes 1 and 2 show gradual s…
We present a systematic study on the effect of oxygen and hydrogen plasma-generated reactive species on the properties of ZnO nanowires. Upon exposure to oxygen plasma, the electrical conductivity of an individual ZnO nanowire decreased with substantial changes in the surface chemistry, indicating a decrease in the nu…
High-frequency dynamics of liquid Te near the melting temperature has been investigated by the inelastic x-ray scattering measurements. Dynamic structure factors S(Q; E) are obtained at 500, 650 and 800 ±C. Acoustic excitation is ascertained at each temperature: its Q- dependent phase velocity v(Q) switches from high-…
The formation of radicals from the gas-phase pyrolysis of hydroquinone (HQ) from 400 to 825 °C was studied using the technique of low-temperature matrix isolation−electron paramagnetic resonance (LTMI−EPR). Cooling the reactor effluent in a CO 2 carrier gas to 77 K produced a cryogenic matrix that exhibited complex EP…
This investigation demonstrates the feasibility of the radial and azimuthal axially symmetric LC structure using double-side photoalignment in a dye-doped liquid crystal (DDLC) cell. A linear and linearly polarized beam is applied to a rotated DDLC cell to produce an axially symmetric LC alignment. Notably, double-sid…
Visible IR-to-green photon-avalanche upconversion is reported in an Ho3+ singly doped beta-Na(Y1.5Na0.5)F6 crystal under 980 nm excitation. Upconverted green, red, and IR emissions are observed at 540, 645, and 751 nm, respectively. Temporal evolution and excitation power dependent upconversion intensity are measured,…
Rheological, optical and structural properties of colloidal suspensions of charge-stabilized gibbsite platelets across the sol–gel transition region are investigated. In this work we focus on samples with a low salt content (10 −4 M). While at a gibbsite concentration of 300 g l −1 , a nematic–columnar phase separatio…
Exciton recombination dynamics of zinc-blende CdTe nanocrystals (NCs) have been investigated by using an ionic liquid as a cryogenic matrix. Size and temperature dependence of photoluminescence lifetimes of CdTe NCs were studied by time-resolved spectroscopy. The photoluminescence properties in a low-temperature range…