Materials Literature
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Combining experiment and theory, evidence from surface-enhanced Raman scattering (SERS) were obtained for p,p'-dimercaptoazobenzene (DMAB) produced from p-aminothiophenol (PATP) by selective catalytic coupling reaction on silver nanoparticles. The time-dependent SERS spectra of PATP are consistent with the calculated…
A method is presented to produce graphene dispersions, stabilized in water by the surfactant sodium cholate, at concentrations up to 0.3 mg/mL. The process uses low power sonication for long times (up to 400 h) followed by centrifugation to yield stable dispersions. The dispersed concentration increases with sonicatio…
Our web site (http://ekhidna.biocenter.helsinki.fi/dali_server) runs the Dali program for protein structure comparison. The web site consists of three parts: (i) the Dali server compares newly solved structures against structures in the Protein Data Bank (PDB), (ii) the Dali database allows browsing precomputed struct…
Biomedical application of silver nanoparticles has recently gained much attention. In this study, we investigated whether hydrocolloids of silver nanoparticles (nano-Ag) are deposited in chicken bones during embryogenesis and to what extent they can affect biochemical characteristics, mineral content, structure, and m…
The magnetic-field dependence of the energy spectrum of GaAs doped with nitrogen impurities is investigated. Our theoretical model is based on the phenomenological Band Anticrossing Model (BAC) which we extended in order to include magnetic field and electron - phonon interaction. Due to the highly localized nature of…
The ability to propagate heat in a film should improve with increasing thickness. However, graphene has a higher thermal conductivity than graphite, despite having a smaller thickness. The crossover from two-dimensional to bulk graphite is now studied experimentally and explained theoretically. The results may pave th…
We report on the optimisation of a recently developed high performance 0-3 piezoelectric composite comprising of the piezoelectric Lead Zirconate Titanate (PZT) powder and a liquid crystalline thermosetting matrix polymer (LCT). The matrix polymer is a liquid crystalline polymer comprising of an HBA-HNA backbone with…
Abstract The branched tripodal chloro‐methyl‐siloxanes of the general formula t BuSi[{OSiMe 2 } y OSiMe 3– x Cl x ] 3 [ x = 0–3; y = 0–2] were synthesized, starting with tert ‐Butyl‐trisilanol ( 1 ). The treatment of 1 with the chloro‐methyl‐silanes (Me 3– x SiCl x +1 ) ( x = 0–3) in the presence of triethylamine lead…
A series of 1,2,3,4,8,9,10,11-octasubstituted pentacenequinone derivatives were prepared by the oxidation of 1,2,3,4,8,9,10,11-octasubstituted pentacenes, which were synthesized by the double homologation method. Oxidation of the pentacenes was carried out with H(5)IO(6) or air and DDQ. These octasubstituted pentacene…
Der molekulare Nanocluster [Ag48(μ4-S)6(μ2/3-SCH2Fc)36] (1) (siehe Bild; Ag blau, S gelb, Fe orange, C grau; Fc=Ferrocenyl) wurde in guten Ausbeuten hergestellt und durch Einkristall-Röntgenbeugung charakterisiert. Die 36 Ferrocenylmethylthiolat-Liganden hüllen den Ag-S-Kern vollständig ein, und cyclovoltammetrische M…
Ca(BH(4))(2) is one of the promising candidates for hydrogen storage materials because of its high gravimetric and volumetric hydrogen capacity. However, its high dehydrogenation temperature and limited reversibility has been a hurdle for its practical applications. In an effort to overcome these barriers and to adjus…
Abstract The intermetallic compound PdZn was reported to have two modifications, the tetragonal CuAu‐type low‐temperature phase and the cubic CsCl‐type high‐temperature phase. The existence of the cubic high‐temperature phase at the equiatomic composition could not be proven experimentally. Calculations of the total e…
Carbon nanofibers containing linear mesocage arrays were prepared via evaporation induced self-assembly method within AAO template with an average channel diameter of about 25 nm. The TEM results show that the mesocages have an elongated shape in the transversal direction. The results of N2 adsorption-desorption analy…
To better understand the influence of environmental conditions on the adsorption of extracellular chromosomal DNA and its availability for natural transformation, the amount and conformation of adsorbed DNA were monitored under different conditions in parallel with transformation assays using the soil bacterium Azotob…
The molecular nanocluster [Ag48(μ4-S)6 (μ2/3-SCH2Fc)36] (1) (see picture; Ag blue, S yellow, Fe orange, C gray; Fc=ferrocenyl) has been prepared in good yield and characterized by single-crystal X-ray diffraction. The 36 ferrocenylmethylthiolate ligands envelop the AgS core. Cyclic voltammetry of 1 displays one rever…
Polymeric 4-VP (p(4-VP)) particles were synthesized in an oil-in-water microemulsion system using various amounts of ethylene glycol dimethacrylate (EGDMA) as crosslinker. The prepared p(4-VP) particles were chemically modified to obtain positively charged particles as polyelectrolytes. Furthermore, these p(4-VP) part…
Komplett und linear werden Fettsäuren in Polyester eingebaut. Dafür sorgen eine Carbonylierung unter Isomerisierung zu Diestern und deren Polykondensation mit den entsprechenden, durch Reduktion erhaltenen Diolen. Die strikt linearen, langkettigen Polyester zeichnen sich durch eine hohe Kristallinität aus und zeigen e…
In the latest years, innovative nanomaterials have attracted a dramatic and exponentially increasing interest, in particular for their potential applications in the biomedical field. In this paper, we reported our findings on the cytocompatibility of barium titanate nanoparticles (BTNPs), an extremely interesting cera…
Evanescent modes in complete sonic crystals (SC) and SC with point defects are reported both theoretically and experimentally in this paper. Plane wave expansion (PWE) and, in general, $ω(k)$ methods have been used to calculate band structures showing gaps that have been interpreted as ranges of frequencies where no r…
Complete and linear incorporation of fatty acids into polyesters is achieved by isomerizing carbonylation to give polymerization-quality diesters and their polycondensation with the corresponding diols obtained by reduction. The strictly linear and long-chain hydrocarbon nature of these polyesters results in a high de…