Materials Literature
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Good cholesterol: Oligo(p-phenylenevinylene)s (OPVs) that are mono- or disubstituted with cholesterol moieties form pseudo-J and pseudo-H aggregates, respectively (see picture), which lead to coiled and twisted helical structures with distinct optical, chiroptical, and morphological properties.
One of the most spectacular phenomena in physics in terms of dynamical range is the glass transition and the associated slowing down of flow and relaxation with decreasing temperature. That it occurs in many different liquids seems to call for a ‘universal’ theory. In this article, we review one such theoretical appro…
The basic principles of incorporating high level radioactive waste into glasses, ceramics (Synroc type) and glass composites including glass ceramics are described. Current UK technology uses glass wasteforms for the products of reprocessing, although many countries are temporarily storing the ceramic spent fuel for e…
The thermal quenching of Eu 2+ 5d–4f emission on Ba, Sr, or Ca sites in compounds is often attributed to a large displacement between the ground state and excited state in the configuration coordinate diagram. This work will demonstrate that the ionization of the 5d electron to conduction band states is the genuine qu…
OBJECTIVE: This study evaluates a novel photon radiation detector system for in vitro biokinetic measurements. METHODS: A cell-culture well can be considered to consist of two different compartments: the cells and the medium. By placing the well on a lead-collimated scintillation (NaI(T1)) detector, changes in activit…
We report the kinetics of CO binding to a series of substituted ferrous tetra(4-X-phenyl)porphyrins ( X = CF 3 , Cl , H , CH 3 , OCH 3 ) in DMSO solvent using a mixture of 1,2-DMI/1-MeIm as proximal base. The CO dissociation rate constant increases with electron donation of the substituent X; the aggregate Hammett ρ v…
Abstract Star-shaped poly(ε-caprolactone) (PCL) polymers were synthesized and fully characterized by gel permeation chromatography, matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) as well as 1 H NMR spectroscopy. First a series of four-armed PCLs with different molecular wei…
Studies of the stress corrosion cracking behaviour of an Al–Li alloy (8090) in the underaged, peak aged and overaged conditions were conducted using a constant load technique in a chloride containing solution. The stress corrosion tests were carried out using a range of applied stress values under both anodic and cath…
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…