Materials Literature
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Carboxylated polypyrrole (CPPy) nanotubes were fabricated by the chemical copolymerization of pyrrole and pyrrole-3-carboxylic acid (P3CA) using cylindrical micelle templates. Importantly, the chemical functionality of CPPy nanotubes was determined by the input amount of P3CA and their redox property was also retained…
The effect of some mono azo dye compounds on the dissolution of carbon steel (type L-52) in 2M hydrochloric acid solution was studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreasing temperatures. Inhibit…
Abstract In order to elucidate the origin of gain‐narrowed photoluminescence spectra of 5,5″‐bis(4‐biphenylyl)‐2,2′:5′,2″‐terthiophene (BP3T) single crystals, the dependence of excitation energy threshold on excitation lengths was studied at 12 K. The emission peak of the 0‐1 vibrational band was narrowed at a constan…
Als Streifenmuster auftragbar: Mithilfe einer weichen Lithographiemethode können Nanomuster der Spinübergangsverbindung 1 erzeugt werden. Die geordneten kristallinen Mikrostrukturen bilden Streifen auf Siliciumdioxidoberflächen. Als mögliche Anwendungsgebiete kommen elektronische Funktionseinheiten und die Information…
An epitaxial ZnO heterojunction light-emitting diode with an n-ZnO/MgO/TiN/n + -Si structure is produced by pulsed-laser deposition. By introducing a thin MgO/TiN buffer and a low temperature (LT) ZnO buffer, layer-by-layer growth of high quality ZnO epi-layer on Si(1 1 1) has been realized, which was confirmed by in…
Undoped and nitrogen-doped ZnO (ZnO : N) with a typical size of about 60 nm were fabricated by Nd : YAG laser ablation of a Zn target under mixed O 2 /N 2 gas. Their photoluminescence (PL) was studied. Compared with undoped ZnO, approximately a 500% PL enhancement was observed when nitrogen gas at 150 kPa was added to…
Abstract In the present work, we investigated a first generation of a new dendrimer as candidate for intravenous (iv) administration of a therapeutic compound (2′‐(benzo[1,2‐c] 1,2,5‐oxadiazol‐5(6)‐yl (N‐1‐oxide) methylidene]‐1‐methoxy methane hydrazide). This compound presents antichagasic activity but low water solu…
Nanoröhren erkennen Isomere: Ein Photolack aus Kohlenstoffnanoröhren in einem Calixaren-substituierten Polythiophen erkennt die Isomere von Xylol mit hoher Empfindlichkeit (siehe Bild). Dies belegen Widerstandsänderungen, Messungen an der Quarzmikrowaage und Fluoreszenzstudien. Das System stellt die Entwicklung kosten…
The polymorphism of an industrial important pigment (PR179) was studied with a combination of standard crystal structure prediction and metadynamics. The former provided a starting set of candidate polymorphs whose structural and thermal stability were then probed by metadynamics. Moreover, metadynamics allowed for ex…
We show that after long times (24 h), individual circular domains in 50 nm thick [001] epitaxial films of ferroelectric lead zirconate titanate (PZT) develop facets due to the crystalline anisotropy, e.g. along [100] directions. This appears to be a creep process (Tybell et al 2002 Phys. Rev. Lett. 89 097601; Paruch e…
Abstract In this study, the sandwich‐like bis(phthalocyaninato)lanthanide(III) complexes MPc 2 (M = Lu, Gd) have been prepared. The reaction of 4,5‐bis(mercaptopropylisobutyl‐POSS)phthalonitrile ( 1 ) [POSS: polyhedral oligomeric silsesquioxane] with lithium gave the dilithium octakis(mercaptopropylisobutyl‐POSS)phtha…
For the first time, the growth of ZnO nanobelts was monitored in situ using x-ray diffraction. The growth was carried out by heating metallic zinc powder in air at temperatures ranging from 368 to 568 °C. The morphology depends on both the growth temperature and the rate of heating to that temperature. A morphology di…
Abstract Fabrication of two and three‐dimensional nanostructures requires the development of new methodologies for the assembly of molecular/macromolecular objects on substrates in predetermined arrangements. Templated self‐assembly approach is a powerful strategy for the creation of materials from assembly of molecul…
We report a detailed theoretical study of the thermal magnetic properties of the Ni sublattice in half-metallic NiMnSb. The study is performed in the temperature interval where the disordering of the Mn sublattice is weak and the properties of the Ni sublattice can play a crucial role. In earlier work it was suggested…
The molecular dynamics method is used in this paper to investigate the effect of boron nitride (BN) impurities on the elastic properties of armchair (5, 5) (10, 10) and zigzag (9, 0) (18, 0) single-walled carbon nanotubes (SWCNTs). The results show the Young's moduli of armchair (5, 5) (10, 10) and zigzag (9, 0) (18,…
For the explanation of the enhanced transmission through the perforated metal plate with below-cutoff holes, the eigenoscillations of the double-periodic screen are studied. It is found that the origin of the recently discovered effects is the existence of the eigenoscillations of the interface between the free halfsp…
The influence of different binders (alumina, silica sol, and montmorillonite) on the structure and performance of PtSnNa/ZSM-5 catalysts for propane dehydrogenation to propene was studied. Temperature-programmed desoption of ammonia (NH 3 -TPD), hydrogen chemisorption, BET surface area measurement, solid-state 27 Al M…
We report the high-resolution crystal structures of an extensively simplified variant of bovine pancreatic trypsin inhibitor containing 20 alanines (BPTI-20st) and a reference single-disulfide-bonded variant (BPTI-[5,55]st) at, respectively, 1.39 and 1.09 A resolutions. The sequence was simplified based on the results…
Streptococcus mutans, an etiological agent of dental caries, is a normal inhabitant of dental plaque. Two main virulence factors of S. mutans are acidogenicity and aciduricity - the ability to produce acid and survive at low pH, respectively. Metabolic processes, including the catabolism of pyruvate, are finely regula…
The epitaxial growth of ZnO nanosheets and nanoneedles from a Zn/ZnO core/shell structure is verified by an experiment in which the ZnO nanoneedles and nanosheets are synthesized in air within an ultra-low temperature range from 250 to 400 °C by thermal oxidation of Zn films made up of hexagonal nanodiscs or nanoprism…