Materials Literature
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X-ray radiation plays an important role in medical procedures ranging from diagnostics to therapeutics. Due to the harm such ionizing radiation can cause, it has become common practice to closely monitor the dosages received by patients. To this end, precise online dosimeters have been developed with the dual objectiv…
The thermal degradation of three Mediterranean forest fuels was studied by using thermogravimetric analysis. The different behaviours were compared and the degradation characteristics were determined for each fuel. Then a kinetic study was performed. Simple modelling of the thermal degradation was carried out with a g…
This paper reports an experimental and computational study on the energetics of 1,2,3-benzotriazin-4(3H)-one. The standard (p° = 0.1 MPa) molar enthalpy of formation of solid 1,2,3-benzotriazin-4(3H)-one, at T = 298.15 K, was derived from its standard massic energy of combustion measured by static bomb combustion calo…
Abstract Four ternary semiconductors (CuAlS2, CuGaS2, CuInS2, AgGaS2) are analyzed using DFT based ab initio method as implemented in the CASTEP module of Materials Studio. Structural, electronic, elastic and optical properties are consistently calculated and compared among all compounds and with other data available…
We demonstrate a phase transfer method to create stable colloidal solutions of Au nanoparticles with 4-methoxypyridine ligands. We then investigate the adsorption behavior of 4-methoxypyridine onto gold surfaces by Raman spectroscopy, DFT calculations, and (1)H NMR. In contrast to unsubstituted pyridine and the freque…
Abstract Kochia sieversiana (Pall.) C. A. Mey is a forage plant in the family Chenopodiaceae, which can grow in extremely alkalinized grasslands at pH levels of 10 or higher. Kochia sieversiana often contains a large amount of oxalic acid. In the present study, seedlings of K. sieversiana were exposed to the following…
Abstract Bacteria adhesion on implant surfaces is the major reason for local and systemic infections after implantation. In order to establish an anti‐adhesion material, we constructed self‐assembly nanostructured surfaces by wetting of poly(lactic‐co‐glycolic acid) (PLGA) films in ethyl acetate followed by a next ste…
The inhibition of potassium dichromate on the corrosion protection of mild steel embedded in concrete and partially immersed in sulphuric acid and sodium chloride environments was evaluated at ambient temperatures. The experiments were performed using electrochemical potential monitoring method. Varying quantities of…
We undertake an exact numerical study of the effects of disorder on the Anderson localization of electronic states in graphene. Analyzing the scaling behaviors of inverse participation ratio and geometrically averaged density of states, we find that the Anderson metal-insulator transition can be introduced by the pres…
The excitation of sound vibrations of a cylindrical fine fiber due to the impact of a spherical aerosol particle is investigated. The equations describing the dynamics of impact are derived for an arbitrary shooting parameter. The coefficient of restitution is calculated, and its analytical approximation is obtained.…
We calculated the adsorption energy for ethanol on the magnesite {10.4} surface using density functional theory (DFT) and cluster models for the mineral surface, and we quantified the errors introduced by using a finite size cluster, freezing various parts of the mineral cluster during geometry optimization and for al…
Accurate measurement of electromagnetic and thermal stresses in cryogenic environments on superconductors is quite challenging, since the environment involves cryogenics and large time-varying as well as dc transport currents through the superconductor. In off-normal cases, such as the transition of a superconducting…
A simple synthesis route was designed to fabricate a functional composite, zinc hydroxide carbonate (ZHC) flowers on zinc oxide (ZnO) nanorods. The hydrolysis of hexamethylenetetramine (HMT) can generate various species which are slowly released and gradually change reaction modes in a Zn(NO(3))(2)/HMT solution. As a…
X-ray mirrors are needed for beam steering, beam alignment and monochromatisation at advanced research light sources like 3rd generation synchrotron sources (e.g. PETRA III in Hamburg) or Free-Electron Lasers (for instance FLASH or the European XFEL). At the Helmholtz-Zentrum Geesthacht (formerly GKSS), an in-house de…
Collagen IV (Col IV) and laminin (Lam) are the main structural components of the basement membrane where they form two overlapping polymeric networks. We studied the adsorption pattern of these proteins on five model surfaces with tailored density of -OH groups obtained by copolymerization of different ratios ethyl ac…
Abstract A new phase of magnesium silicon nitride, β‐MgSiN2, is synthesized in a laser‐heated diamond anvil cell at pressure of 27 GPa and temperatures exceeding 2000 K. It crystallises in a rhombohedral caswellsilverite‐type structure (space group $ (R \bar 3m) $ with both Mg and Si atoms in octahedral coordinations…
A ternary coordination polymer, [Cd(L)(pbda)0.5] n [HL = 3,5-bis(2-pyridylmethyl)aminobenzoic acid, pbda = dianion of 1,4-benzenedicarboxylic acid], has been synthesized and characterized by elemental analysis, FT-IR spectroscopy, powder X-ray diffraction, thermogravimetric analysis, and single-crystal X-ray diffracti…
In this paper, we present a new roll-to-roll method to fabricate visible light transparent microlens arrays on a glass substrate by using soft and cost-effective polydimethylsiloxane (PDMS) molds. First, we fabricated microlens array master molds by photoresist thermal reflow processes on silicon substrates. We then t…
Versilberte Moleküle: Die kontrollierte Metallierung einzelner Phthalocyanin(H2Pc)-Moleküle unter Bildung von AgPc wurde mit Rastertunnelmikroskopie (STM) bei niedriger Temperatur beobachtet. Auf eine stufenweise Dehydrierung folgt eine Ag+-Implantation; auch eine Tautomerisierung und ein H-Atom-Hopping im inneren H2P…
Our aim was to find out to which extent fossil phytoplankton pigments in the large shallow and turbid Lake Võrtsjärv carry information on the history of phytoplankton communities. For this purpose we examined how the changes in the pigment composition of surface sediments follow their changes in the water column. Dept…