Materials Literature
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On the basis of the momentum-balance equation derived from the Boltzmann equation in which electron interactions with impurities and acoustic and optic phonons are included, we examine the dependence of the resistivity in graphene on temperature and electron density. Simple analytical expressions for the different con…
Abstract Ethylene vinyl acetate (EVA, 18 mol % vinyl acetate) and epoxidized natural rubber (ENR, 50 mol % epoxidation) were blended in an internal mixer and compared to EVA. Dicumyl peroxide (DCP) was used as a curing agent. The blends consisted of 10–50 wt % of ENR and were compared with crosslinked EVA in terms of…
Abstract Microfibrillar‐reinforced elastomer composites based on two dispersed phases, liquid crystalline polymer (LCP) and recycled poly(ethylene terephthalate)(rPET), and styrene‐(ethylene butylene)‐styrene (SEBS) were prepared using extrusion process. The rheological behavior, morphology, and thermal stability of S…
Abstract Mit erhobenem Stachel : Ein enantiomerenreiner Neodymkomplex (siehe Schema) wirkt als effizienter Initiator für eine kontrollierte Ringöffnungspolymerisation von rac ‐Lactid zu einem isotaktischen Polyester. Der Heteroskorpionatkomplex wurde spektroskopisch und durch eine Röntgenstrukturanalyse charakterisier…
Abstract In this work, we demonstrate nano‐structured silver particles photo‐reduced from silver nitride (AgNO 3 ) solution using visible‐light‐activated titanium dioxide (TiO 2 ), which can be a convenient and effective substrate for surface enhanced Raman spectroscopy (SERS) observation. Visible‐light‐activated carb…
Abstract In a row: Chemical concepts from the spin‐polarized conceptual DFT field are used to explain the spectrochemical and nephelauxetic series within a group of ruthenium complexes. magnified image The spectrochemical and nephelauxetic series are analyzed within the context of spin‐polarized conceptual DFT. For a…
We performed first-principles calculations of multiplet structures and the corresponding ground-state absorption and excited-state absorption spectra for ruby $({\text{Cr}}^{3+}:\ensuremath{\alpha}{\text{-Al}}_{2}{\text{O}}_{3})$ and alexandrite $({\text{Cr}}^{3+}:{\text{BeAl}}_{2}{\text{O}}_{4})$ which included latti…
In an attempt to develop a biofriendly sol-gel route for the rapid formation of biofunctional silica gels, a biopolymer with good biocompatibility was used to assist the gelation of glycol-modified tetraethoxysilane (GMT) in aqueous system without the addition of any organic solvents. It was found that the biopolymer…
A dinuclear nickel(II) complex, [Ni2(MOBPT)2(N3)4] · 2H2O (MOBPT = 4-(p-methoxyphenyl)-3,5-bis(pyridine-2-yl)-1,2,4-triazole), has been synthesized and characterized by elemental analysis, UV, IR, ESI-MS, and single crystal X-ray crystallography. The complex crystallizes in triclinic system, space group P 1 with a = 9…
In this work we report a new thermochemical method for the synthesis of ZnS:Mn nanocrystals. Zn(NO(3))(2) and Na(2)S(2)O(3) were used as the precursors and Mn(NO(3))(2) was the source of impurity. Thioglycerol (TG,C(3)H(8)O(2)S) was also used as the capping agent and the catalyst of the reaction. Na(2)S(2)O(3) is a he…
We demonstrate the fabrication and testing of a prototype microtome knife based on a multiwalled carbon nanotube (MWCNT) for cutting approximately 100 nm thick slices of frozen-hydrated biological samples. A piezoelectric-based 3D manipulator was used inside a scanning electron microscope (SEM) to select and position…
The magnetic properties, magnetic entropy change, and hysteresis loss in LaFe11.7(Si1−xCux)1.3 compounds were investigated. It was found that the compounds retain the cubic NaZn13 structure when the substitution of Cu reaches 20%. With increasing Cu content from x=0 to 0.2, the Curie temperature TC increases from 185…
In this paper a generalization of a stress-dependent magnetostriction phenomenological model is presented. The model makes use of a classical Preisach operator and of a memoryless bivariate function and includes a pure elastic contribution. It is shown that, even if the structure of the model is simple, the operator s…
The influence of nitrogen doping in semiconducting carbon nanotubes is investigated by first-principles calculations considering a wide variety of substitution sites and concentrations. The frequency of the radial breathing mode of a (8,0) nanotube is calculated using density-functional theory and frozen-phonon approx…
The failure of artificial vascular grafts in small diameter vessel replacement is mainly due to the early formation of thrombosis. To prevent the occurrence of thrombosis, much effort has been focused on developing an anti-thrombogenic coating of synthetic vascular prostheses or artificial conduits with improved anti-…
Abstract Am seidenen Faden : Spinnenseiden haben mechanische Eigenschaften, die jene der meisten natürlichen und synthetischen Fasern übertreffen. Wegen der Komplexität des In‐vivo‐Spinnprozesses scheiterte bislang seine Nachahmung durch klassische Spinnmethoden. Die Analyse des natürlichen Prozesses, kombiniert mit E…
Magnetic ordering can tune optical properties of photoluminescent dilute magnetic semiconductors. The results of a magnetic field dependent photoluminescence (PL) up to 50 T above and below ferromagnetic transition temperature ${T}_{C}$ in Mn-doped ZnS nanocrystals have been reported here. The PL intensity correspondi…
The thermal performance of microelectromechanical systems devices is governed by the structure and composition of the constituent materials as well as the geometrical design. With the continued reduction in the characteristic sizes of these devices, experimental determination of the thermal properties becomes more dif…
The spectroscopic properties of Er 3+ /Yb 3+ co-doped 50SiO 2 –10Al 2 O 3 –20ZnF 2 –20SrF 2 glass and glass ceramic containing SrF 2 nanocrystals were investigated. The formation of SrF 2 nanocrystals in the glass ceramic was confirmed by XRD. The oscillator strengths for several transitions of the Er 3+ ions in the g…
A fabrication process for monolithic integration of vertically aligned carbon nanotubes in electrically insulated microfluidic channels is presented. A 150 nm thick amorphous silicon layer could be used both for anodic bonding of a glass lid to hermetically seal the microfluidic glass channels and for de-charging of t…