Materials Literature
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Surface relief holograms are fabricated by irradiation of laser intensity pattern on the azo-benzene functionalized polymer films. The diffraction efficiency and the surface relief depth depend on the writing energy and the polarization of the laser beam. This structure is very stable at temperatures below the glass t…
Recent advances in electron transfer chemistry of supramolecular electron donor-acceptor assemblies – containing porphyrins and metalloporphyrins – in connection with ICPP-3 are reviewed briefly by focusing on aspects of electron and energy transfer reactions.
We have investigated the recording characteristics of the dual-layer phase-change recording media for a system that uses the blue-violet laser (wavelength of 405 nm), with the numerical aperture of 0.65 and light incidence on 0.6-mm-thick substrate having the land and groove format (HD DVD). In order to achieve higher…
The crystal structure, magnetization, and spontaneous magnetostriction of Tb/sub 1-x/Nd/sub x/(Fe/sub 0.9/B/sub 0.1/)/sub 2/ alloys have been investigated. X-ray diffraction (XRD) analysis shows that the alloys consist predominantly of the cubic Laves phase with a MgCu/sub 2/-type structure for x/spl les/0.55. Increas…
The ultrasonic measurement technique was proven to be an accurate, reproducible, fast, and easy to use technique for the determination of crystal growth kinetics. Desupersaturation curves of various solutions of inorganic and organic substances, e.g., copper sulphate pentahydrate (CuSO 4 · 5 H 2 O) and potash alum (KA…
The photoluminescence properties of mercaptocarboxylic acid-stabilized CdSe nanoparticles were modified by coating with polyelectrolyte. With a concentration of the positively charged polyelectrolyte poly(diallydimethyl-ammonium chloride) (PDDA) of 0.45 and 1.14 g l −1 , the intrinsic emission of CdSe nanoparticles wa…
Yams production from recycled fibers (RF) is limited, and spinners often prefer to produce coarse yams from these fibers. In this research, we attempt to produce middle- count twp-component and three-component yams from RF in such a way that the RF in the yarn core are completely covered by virgin cotton fibers. To im…
Polarization switching and retention of each of the two polarized states in Langmuir—Blodgett (LB) ferroelectric films are studied using nonlinear dielectric spectroscopy. It is found that polarized states can be preserved for a long time, but the polarization dynamics in 10–40-nm-thick LB films is characterized by a…
Silicon dioxide thin films with variable and controlled porosity have been prepared at room temperature by plasma enhanced chemical vapor deposition in an electron cyclotron resonance microwave reactor with a downstream configuration. The procedure consists of the deposition of successive cycles consisting of a sacrif…
The aqueous dissolution of irradiated and unirradiated uranium-thorium dioxide, (U,Th)O2, fuel pellets in Yucca Mountain well water has been investigated. Whole and crushed pellets were reacted at 25 and 90°C for periods of up to 195 days. The fuel dissolution was measured by analyzing the concentrations of soluble ur…
The influence of age hardening temperature and time on the hardness, tensile properties, electrical conductivity, and microstructure of Cu – 4Ti – 0.1Zr and Cu – 3Ti – 0.1Zr alloys has been investigated. The resulting microstructure of these alloys suggests that zirconium addition prohibited the formation of compositi…
The absorption spectra, temperature dependence of light transmission, and dc resistivity of ${\mathrm{La}}_{0.92}{\mathrm{Ca}}_{0.08}\mathrm{Mn}{\mathrm{O}}_{3}$ single crystal are investigated. The volume of the metallic phase in insulating matrix is evaluated by analyzing the temperature dependence of the light abso…
We report near-edge absorption fine structure (NEXAFS) and UV photoemission spectroscopy (UPS) studies of aligned single-walled carbon nanotube films on Si(100) substrates. Orientation of the films was detected in the NEXAFS spectra, with the intensity of the π* core exciton at 284.4 eV showing a strong dependence on…
Cyclic oxothiomolybdates containing polyphosphate ions were prepared by simple reactions in aqueous medium of the corresponding polyphosphate ions and the cyclic precursor K(2)I(2)Mo(10)S(10)O(10)(OH)(10)(OH(2))(5).15H(2)O. K(5)[Cl(P(2)O(7)]Mo(12)S(12)O(12)(OH)(12)(H(2)O)(4)].22H(2)O (1) was isolated from concentrated…
The influence of uniaxial mechanical stress on the magnetization processes and energy losses in nonoriented Fe-Si steels is investigated under alternating and circular rotational flux. The advanced waveform control and measurement technique allow creating any kind of magnetic flux from alternating in all directions to…
Novel oxide dispersion strengthened (ODS) metals were synthesised by mechanical alloying (MA) and subsequent consolidation via hot pressing in protective argon atmosphere. The effect of dispersoid size and volume fraction on the electrical and mechanical properties is exemplified with Cr 2 O 3 , CaO and Y 2 O 3 as mod…
Abstract The effects of polyolefins composition, that is polyethylene (PE), polypropylene (PP) and a ethylene/propylene copolymer (EPM) of 45/55 monomer ratio, and of operating conditions (screw speed, throughput and screw configuration) on the grafting of maleic anhydride (MA) were investigated. Sampling devices loca…
Abstract Three new 2,5‐bis(1,3‐dithiolan‐2‐ylidene)‐1,3,4,6‐tetrathiapentalene (BDH‐TTP) radical cation salts with the photochromic nitroprusside anion have been synthesized: κ‐(BDH‐TTP) 4 [FeNO(CN) 5 ]·NB ( 1 ), κ‐(BDH‐TTP) 4 [FeNO(CN) 5 ] ( 2 ), and (BDH‐TTP) 2 [FeNO(CN) 5 ] ( 3 ). The salts were characterized by si…
Classical flame-retardant treatments for cellulosic materials are phosphorous-nitrogen-based compounds. In this work, cotton fabric is treated with different formulations based on diguanidine hydrogen phosphate (DGHP) or monoguanidine dihydrogen phosphate (MGHP), individually or in combination with a resin (melamine)…
Recently, a high value nonlinear parameter of liquid containing contrast agents (encapsulated microbubbles) has been reported by some measurements, however an effective way to study it theoretically has not been found so far. In this paper, an approach, based on the concept of the equivalent nonlinear parameter is pre…