Materials Literature
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Owing to the hollow structure of carbon nanotubes, they could be filled with various kinds of molecules, providing opportunities for studying the properties of molecules confined in nanospace. On the one hand, the spatial confinement imparts novel and distinct properties to the encapsulated species from their counterp…
In this work, Fluorohydroxyapatite (FHA) nanopowders were synthesized using nonalkoxide sol-gel method. Here calcium nitrate tetrahydrate Ca(NO3)2.4H2O, phosphorous pentoxide (P2O5) and ammonium fluoride (NH4F) were used to provide Caprecursor, P- precursor and fluorine reagent, respectively. The FHA powders were calc…
We describe microRaman studies of serpentine single-walled carbon nanotubes grown on single-crystal quartz. Local Raman spectra were collected from bent and straight segments of the same nanotube to elucidate the effects of bending. Bending radii as large as 1--2 $\ensuremath{\mu}\text{m}$ produce a measurable shift o…
The thermal expansion behavior of silica and aluminophosphate clathrasil materials that adopt the AST-type structure has been studied in both as-made and calcined forms using X-ray diffraction (single crystal or powder) over the temperature range 100−400 K. The four materials studied all adopt body-centered tetragonal…
Epoxidized natural rubber (ENR) samples of various epoxidation degrees were synthesized from natural rubber (NR) latex, and 25 mole% epoxide of ENR was used to prepare ENR room temperature-curable films for coating applications. The films were prepared from rubber solutions. Trimethylolpropane tris(2-mercaptoacetate)…
A narrow range of composition exists along the ZrO 2 –YTaO 4 quasi‐binary in which the tetragonal phase can be retained on cooling. Ceramics within this region, corresponding to equimolar YO 1.5 and TaO 2.5 stabilizer concentrations, have been subject to accelerated testing for their susceptibility to moisture‐induced…
We report on the thermally excited resonance vibrations of mesoscopic poly(methylmethacrylate)-poly( n -butylacrylate) (PMMA-P n BA) random copolymer colloidal spheres with varying n BA volume fractions. All systems but the bulk P n BA are in the glassy state at room temperature. Brillouin light scattering (BLS), diel…
Effects of radiation-induced amorphization of smectite were investigated using artificial irradiation. Beams of 925 MeV Xenon ions with radiation dose reaching 73 MGy were used to simulate the effects generated by alpha recoil nuclei or fission products in the context of high level nuclear waste repository. Amorphizat…
Novel silica nanoparticles exhibiting near-infrared (NIR) and dual NIR-visible emission were synthesized according to reverse microemulsion procedure through the encapsulation of Yb(III) complex with p -sulfonatothiacalix[4]arene (Yb) and [Ru(dipy) 3 ]Cl 2 (Ru) as NIR- and visible-emitting luminophores into silica mat…
Cu(I)-mediated annulation of meso,meso'-1,3-butadiyne-bridged Zn(II) diporphyrin with various amines efficiently provided meso,meso'-pyrrole-bridged Zn(II) diporphyrins. Notable intramolecular electronic interactions in these diporphyrins were observed. A starburst porphyrin pentamer was synthesized via Suzuki-Miyaura…
Processing of fine powders is a relevant operation in many industries, from pharmaceuticals to material synthesis. As the size of the particles decreases, adhesive forces become important and can have a nontrivial, but difficult to predict, impact on the mixing/segregation tendency of the material. The aim of this wor…
Atlantic salmon (Salmo salar L.) vertebral bone displays plasticity in structure, osteoid secretion and mineralization in response to photoperiod. Other properties of the vertebral bone, such as mineral content and mechanical strength, are also associated with common malformations in farmed Atlantic salmon. The biolog…
The Au/Porous silicon structure (Au/PS) was developed as hydrogen fuel cell. The use of a porous silicon filled with hydrochloric acid as a proton-conducting membrane and thin gold film as a catalyst in Au/PS/Si fuel cell is demonstrated. The devices were fabricated by first creating 10–20 µm thick porous silicon laye…
Interfacial polymerization approach was developed for the fabrication of the polyaniline micro/nano capsules in the static condition or with stirring. The effects of the emulsion composition such as the amounts of the surfactant, inert solvent (toluene), monomer, and water on the formation of the intact polyaniline ca…
The third dimension comes to the rescue in the synthesis of laterally confined 2D crystals. Graphene-type sheets of layered metal(IV) chalcogenides are stabilized by stacking to form nano-objects that resemble a coin roll. Mismatch strain between NbS2 and WS2 lattices is important for the stabilization of the coin-rol…
In this paper, we extend the scalar wave propagation method (WPM) to vector fields. The WPM [Appl. Opt.32, 4984 (1993)] was introduced in order to overcome the major limitations of the beam propagation method (BPM). With the WPM, the range of application can be extended from the simulation of waveguides to simulation…
Three new chloro-functionalized lanthanide(III) bis(disiloxanediolate) complexes, [{(Ph 2 SiO) 2 O} 2 {Li(DME)} 2 ]Nd(DME)Cl ( 3 ), [{(Ph 2 SiO) 2 O} 2 {Li(THF) 2 } 2 ]HoCl·2THF ( 4 ), and [{(Ph 2 SiO) 2 O} 2 {Li(THF) 2 } 2 ]ErCl·2THF ( 5 ) have been prepared by the treatment of anhydrous lanthanide trichlorides, LnCl…
A multilayer film consisting of poly(acrylic acid) (PAA) and an azobenzene-containing surfactant (AzoTEA) was fabricated via a layer-by-layer assembly technique. The micellar structure favored by AzoTEA while in solution results in a bilayer structure when deposited on a substrate surface. This aggregation conversion…
Local environments surrounding magnetic ions in Mn- or Cr-doped and hydrogenated amorphous Si films have been determined using extended x-ray absorption fine structure (EXAFS) method. These films are found to be ferromagnetic with high Curie temperatures above 250 K and therefore are of tremendous interest for practic…
The present study reports electro-optical parameters of two ferroelectric liquid crystals (FLCs) with the addition of anthraquinone dye D37 as a function of temperature. Accordingly, the parameters appearing in the switching model, the spontaneous polarization, switching time, and rotational viscosity have been determ…