Materials Literature
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XPS measurements of nylon 6,6 recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon, nitrogen, and oxygen peaks are analyzed. This is part of a contract work aiming to record spectra in th…
rf 마그네트론 스퍼터링 방법을 사용하여 유리기판 위에 In₂O₃:ZnO=90:10 wt.%의 조성비를 갖는 indium-zinc-oxide(IZO) 박막을 산소분압 O₂/(Ar + O₂) = 0~10 %의 Ar 가스 분위기에서 제작하였다. IZO 박막의 면저항은 증착 시 유입되는 산소량이 증가함에 따라 현저하게 증가하는데, 순수한 Ar 가스 분위기에서 증착될 때 3.7×10-⁴Ω·㎝ 정도의 가장 낮은 비저항과 가시광 영역에서 평균 85% 이상의 투과율을 보이는 박막이 얻어진다. 600 ℃의 다양한 환경에서 열처리될 경우, 순수한 Ar 분위기에서 성막된 IZO 박막…
The first thin La1−x AgyMnO3 epitaxial films (y ≤ x) were grown on SrTiO3 (110) substrates with silver present in the ionized state (Ag+) only. The Curie temperatures T C of the compositions with x = y = 0.05, x = y = 0.1, and x = 0.3 and y = 0.27 crystallizing in the hexagonal structure $$R\bar 3c$$ above or close to…
The X-ray structure, electrochemistry, and optical spectroscopy of the porphycene analog of a benzochlorin, octaethylbenzochloracene (OEBzC) are reported. The OEBzC macrocycle is easier to oxidize and harder to reduce than octaethylporphycene (OEPc). The optical spectra of OEBzC and of the diacid salt are also reporte…
The process of negative ion formation by electron impact on cytosine (a nitrous base of nucleic acids) has been studied in crossed molecular and electron beams for electron energies in the interval from 0.4 to 5.0 eV. Using a specially developed method, the molecular beam intensity was determined and the energy depend…
Abstract We have studied the influence of surfactant nature and concentration, and monomer concentration on the synthesis of poly(methyl methacrylate) (PMMA) using high-frequency ultrasound. Polymerization was carried out via free radicals from aqueous solutions with several concentrations of an anionic (sodium lauryl…
Abstract Oriented poly(ethylene‐2,6‐naphthalate) (PEN) has been characterised by polarised FT‐IR spectroscopy to determine the structural angles of the transition moments to the molecular chain axis. The bands at 1130 cm −1 , 1142 cm −1 and 1602 cm −1 , which have been previously assigned as having their transition di…
A tunable microwave resonator based on layered ferrite/ferroelectric structures has been developed and characterized. The resonator contained epitaxial yttrium iron garnet films on gadolinium gallium garnet and thick plates of barium strontium titanate (BST). The resonance observed in S 11 characteristics at 4 GHz, wi…
Purpose The paper sets out to formulate the intermolecular forces leading to Barkhausen instability. In the approach the known concept of effective field is used within the framework of the T ( x ) model. The aim is to provide a mathematical tool to theoreticians and applied scientists in magnetism that is easier to u…
The title compounds were synthesized from potassium rich mixtures of Fe 2 O 3 , elemental potassium and the hyperoxide KO 2 by applying short reaction times, a maximum temperature of 875 K and subsequent quenching of the samples. The structures of the two new oxoferrates(III) have been determined by single crystal X-r…
Abstract A novel facile method was developed to prepare methylcellulose from miscanthus, cardoon and eucalyptus. Pulps were obtained by the impregnation rapid steam pulping process (IRSP). A total-chlorine-free (TCF) method was used to bleach the pulps with hydrogen peroxide. Bleached pulps were mercerized in 40% NaOH…
XPS measurements of poly(sulfone resin) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon, sulphur and oxygen peaks are analyzed. This is part of a contract work aiming to record spect…
Metal-free and metallo-phthalocyanines (M=Cu, Ni, Co, Zn) carrying four N-(n-octyl)mercapto acetamide group on peripheral positions have been synthesized from the corresponding phthalonitrile derivatives in the presence or the absence of anhydrous metal salt (CuCl, NiCl2, CoCI2, Zn(CH3COO)2). The novel compounds have…
1,3‐Bis(4‐hydroxyphenyl)propenone (BHPP) and 3‐(4‐hydroxy‐3‐methoxy phenyl)‐1‐(4‐hydroxyphenyl)propenone (HMPHPP) were used as monomers for preparing photosensitive phosphorus containing polyesters. The photosensitive monomers BHPP and HMPHPP were prepared respectively by refluxing 4‐hydroxybenzaldehyde and 3‐methoxy‐…
Purpose The increase of the accuracy of a mathematical model of hysteresis by the choice of the optimum saturation curve for a given material. Design/methodology/approach Hysteresis loops of typical soft magnetic materials are approximated with the help of the Taka´cs magnetization model using different saturation cur…
New silicon-containing poly(amide-imide)s have been synthesized by direct polycondensation of various aromatic diamines with a dicarboxylic acid containing the dimethylsilylene group and preformed imide cycles. These polymers are easily soluble in polar amidic solvents such as N-methylpyrrolidinone (NMP) or dimethylfo…
Abstract A ZSM-5/Y composite zeolite was prepared from Y synthesis gel by using an in-situ two-step hydrothermal crystallization process. Optimized synthetic parameters made it practical to control the transformation of zeolite Y to P, or other undesired phases during ZSM-5/Y composite formation. It was found that the…
Abstract Ultrasound treatment, as an alternative to chemical and radiation-based processes, is an interesting technique for the modification of average molecular weights of natural and synthetic polymers in aqueous solution. Degradation is the observed main effect for strongly hydrophilic compounds - poly(acrylic acid…
The structural, dielectric and conductive properties of [(CH 2 ) 3 (NH 3 ) 2 ]Cu(II)Cl 4 have been studied. The material shows an order-disorder transition at T 1 = (333±2) K and a ferroelectric phase transitions at T 2 = (434±3) K. Results of differential thermal analysis, infrared spectroscopy, X-ray diffraction, AC…
XPS measurements of poly(styrene) recorded with a SSX-100 spectrometer in standardized experimental conditions are presented: survey scan, high resolution core level spectra as well as the energy loss regions of carbon peaks are analyzed. This is part of a contract work aiming to record spectra in the very same condit…