Materials Literature
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A TiNi alloy fiber was used to recover the original shape of materials using its shape memory effect. The shape memory alloy plays an important role within the metal matrix composite. The shape memory alloy can control the crack propagation in the metal matrix composite, and improve the tensile strength of the composi…
Structural investigations on the hydrolysis and condensation behavior of germanium alkoxides were for the first time performed by means of X-ray absorption fine structure and Raman spectroscopy. The studies reveal that germanium alkoxides are monomeric in nature and undergo very fast hydrolysis and condensation reacti…
Field-dependent specific heat and neutron scattering measurements were used to explore the antiferromagnetic $S=\frac{1}{2}$ chain compound $\mathrm{Cu}{\mathrm{Cl}}_{2}∙2({(\mathrm{C}{\mathrm{D}}_{3})}_{2}\mathrm{S}\mathrm{O})$. At zero field the system acquires magnetic long-range order below ${T}_{N}=0.93\phantom{\…
UV-visible, infrared (IR), and resonance Raman (RR) spectra were measured and analyzed for a high-valent molybdenum(V)-oxo complex of 5,10,15-tris[3,5-bis(trifluoromethyl)phenyl]corrole (1) at room temperature. The strength of the metal-oxo bond in 1 was found to be strongly solvent-dependent. Solid-state IR and RR sp…
The goal of this work was to analyse ZrO(2) in the pure state and when doped with Ag nanoparticles, by electron microscopy, x-ray diffraction and thermoluminescence methods. According to the results obtained, Ag nanoparticles did not modify the morphology or the crystalline structure of the ZrO(2). The thermoluminesce…
Abstract The effect of a sorbitol nucleating agent on crystallization of polypropylene (PP) in droplets was studied. Layer‐multiplying coextrusion was used to fabricate assemblies of 257 layers, in which PP nanolayers alternated with thicker polystyrene (PS) layers. The concentration of a commercial nucleating agent,…
Einfach flach! Doppelt β-β-1,3-Butadiin-verbrückte Diporphyrine wurden effizient durch metallkatalysierte Reaktionen synthetisiert. Die Doppelbrücke zwingt die beiden Porphyrine in eine perfekt ebene Konformation (siehe Bild), was eine Zunahme im Zweiphotonenabsorptions-Querschnitt um fast 100 % bewirkt. Supporting in…
Across the great divide: Substituents located opposite one another in meso positions on a [26]hexaphyrin scaffold are forced into close contact through a dynamic conformational change. A simple aryl group and an ethynyl group in these positions undergo a [3+2] annulation reaction either upon thermal activation or spon…
Three series of donor−acceptor π-conjugated (D-π-A) molecules 1 − 3 have been synthesized with a 2,3,6,7-tetrahydro-1 H,5 H -pyrido[3,2,1- ij ]quinolinyl (Julolidine group), N, N -dimethylamino, or N, N -diphenylamino group as the donor moiety, a phenylvinyl or thienylvinyl unit as the bridge, and a bromide or aldehyd…
We have investigated the influence of the microfabrication processes for microelectromechanical systems (MEMS) on the degradation in the ferroelectric and piezoelectric properties of Pb(Zr,Ti)O 3 (PZT) thin films. Multilayers of Pt/Ti/PZT/Pt/Ti/SiO 2 were deposited on silicon-on-insulator (SOI) wafers. The multilayers…
We have characterized the thickness and effective refractive index of carbon nanotube forests by fitting reflectance measurements in the visible and near infrared ranges. The measurements were performed with polarized light. An effective medium layer consisting of a mixture of graphite and air was used to simulate the…
We describe a new method to grow multi-walled carbon nanotube (MWCNT) arrays, which enable very high and stable macroscopic emission current density of 3.55 A cm(-2) along with a scalable total emission current of more than 710 mA. A sandwich-growth technology was employed to synthesize vertically well-aligned MWCNT a…
Abstract This article investigates electrical conductivity and rheological aspects of cyclic olefin copolymer (COC) composites containing both carbon fiber (CF) and carbon black (CB) at various concentrations. The different formulations of carbon filled COC were compression molded in such a manner that the formed circ…
We have successfully realized the integration of ZnO nanotubes and well-ordered nanorods through a simple two-step thermal evaporation of Zn powder without any metal catalyst. Detailed structural analysis shows that the step-one prepared samples at the low substrate temperature are composed of hexagonal-shaped Zn/Zn s…
The initial use of the anion of 6-hydroxymethyl-2,2'-bipyridine (hmbpH) as a chelate in coordination chemistry is described. The syntheses, crystal structures, and magnetochemical characterization are reported of four new iron(III) clusters [Fe5O2(OH)(O2CMe)5(hmbp)3](ClO4)2 (1) and [Fe6O2(OH)2(O2CR)6(hmbp)4](NO3)2 (R=…
Two efficient approaches to assembling organic semiconducting single crystals are described. The methods rely on solvent wetting and dewetting on substrates with patterned wettability to selectively direct the deposition or removal of organic crystals. Substrates were functionalized with different self-assembled monol…
We have measured the viscosity of suspensions of colloidal silica particles (d = 300 nm) and the properties of silica surfaces in solutions of a polymer consisting of zwitterionic monomer groups, poly(sulfobetaine methacrylate), polySBMA. This polymer has potential use in modifying surface properties because the polym…
We report very low-temperature measurements of $^{51}\mathrm{V}$ NMR spectra as a function of external magnetic field in the $s=1∕2$ Heisenberg triangular antiferromagnet cluster ${\mathrm{K}}_{6}[{\mathrm{V}}_{15}{\mathrm{As}}_{6}{\mathrm{O}}_{42}({\mathrm{H}}_{2}\mathrm{O})]∙8{\mathrm{H}}_{2}\mathrm{O}$ (V15), a sim…
Abstract A series of d‐f heterodimetallic bisporphyrin complexes ( YbZn , YbPd , and YbPt ), in which a Yb III porphyrinate moiety is linked to a transition‐metal porphyrinate moiety by a flexible three‐carbon chain, were synthesized. They were fully characterized by high‐resolution mass spectrometry, 1 H and 31 P NMR…
We report the structure and Young's modulus of switchable films formed by peptide self-assembly at the air-water interface. Peptide surfactant AM1 forms an interfacial film that can be switched, reversibly, from a high- to low-elasticity state, with rapid loss of emulsion and foam stability. Using neutron reflectometr…