Materials Literature
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Abstract Vor genau 70 Jahren wurde PVP von Prof. Dr. Walter Reppe in der BASF erfunden und zum Patent angemeldet. Polyvinylpyrrolidon wurde zunächst als Blutplasmaersatzstoff im Zweiten Weltkrieg eingesetzt. Nach und nach fand es dann Anwendung in den unterschiedlichsten Branchen: Pharma‐, Kosmetik‐, Waschmittelindust…
We report the covalent layer-by-layer construction of polyelectrolyte multilayer (PEM) films by using an efficient electrochemically triggered Sharpless click reaction. The click reaction is catalyzed by Cu(I) which is generated in situ from Cu(II) (originating from the dissolution of CuSO(4)) at the electrode constit…
Abstract Polymeric materials are used extensively, but their applications are limited because many of them are flammable. Therefore ways to make them flame retardant have received much attention. In this work, polypropylene (PP) was used as the matrix resin, aluminium hydroxide (Al(OH) 3 ) and magnesium hydroxide (Mg(…
This is the third part of a three-part series that investigates the rolling contact fatigue initiation and spall propagation characteristics of three bearing materials, namely, AISI 52100, VIM-VAR M50, and VIM-VAR M50 NiL steels. Though there is substantial prior work published on the rolling contact fatigue initiatio…
BACKGROUND: Silver has long been known to have antimicrobial activity. To incorporate this property into multiple applications, a silver-impregnated cellulose (SIC) with low cytotoxicity to human cells was developed. SIC differs from other silver treatment methods in that the leaching of silver particles is non-existe…
A theoretical model for the dynamics of a bubble in an elastic blood vessel is applied to study numerically the effect of confinement on the free oscillations of a bubble. The vessel wall deformations are described using a lumped-parameter membrane-type model, which is coupled to the Navier-Stokes equations for the fl…
This paper describes a K-Means Clustering classification algorithm for the separation of Partial Discharge (PD) signals and pulsating noise due to multiple sources occurring in practical objects. It is based on the comparison of the Auto-Correlation Function (ACF) of the recorded signals assuming that the same source…
The surfaces of high-density polyethylene (HDPE), poly(methyl methacrylate) (PMMA), and polyethersulfone (PES) were treated with a low-temperature, atmospheric pressure oxygen and helium plasma. The polymers were exposed to the downstream afterglow of the plasma, which contained primarily oxygen atoms and metastable o…
The purpose of this highlight is to define the emerging field of bioactive surfaces. In recent years, various types of synthetic materials capable of “communicating” with biological objects such as nucleic acids, proteins, polysaccharides, viruses, bacteria or living cells have been described in the literature. This n…
Hydrogen bonding is a powerful driving force for the supramolecular self-assembly of discotic mesogens, and molecular shape also plays an important role in such systems. To study these effects, doubly discotic supermolecules have been synthesized by linking a meso -tetraphenylporphine-4,4′,4′′,4′′′-tetracarboxylic aci…
Author: Neu, R. et al.; Genre: Journal Article; Issued: 2009; Open Access; Keywords: 12th International Workshop on Plasma-Facing Materials and Components for Fusion Applications; Title: Ten years of W programme in ASDEX Upgrade - Challenges and Conclusions
An effective way is developed to fabricate AgPt alloy nanoislands on gold nanorods based on the galvanic replacement between Ag and PtCl(4)(2-) in the presence of cetyltrimethylammonium bromide (CTAB). The optical and catalytic properties benefit from the porous structure composed of AgPt nanoislands. A large red shif…
We have studied the magnetic anisotropy of nanometric CoFe2O4 (CFO) thin films grown on (100)SrTiO3 (STO) substrates. It has been found that epitaxial substrate-induced compressive strain makes the normal-to-film axis harder than the in-plane directions. In agreement with some previous reports, the magnetization loops…
We characterize by different spectroscopic techniques the radiation effects on ytterbium- (Yb) and ytterbium/erbium (Yb/Er)-doped optical fibers. Their vulnerability to the environment of outer space is evaluated through passive radiation-induced attenuation (RIA) measurements during and after exposure to 10 keV X-ray…
Abstract Surface modification of polydimethylsiloxane (PDMS, Sylgard 184) was carried out by O 2 plasma and UV in broadband mode/O 2 plasma treatments with different exposure times, and studied in terms of hydrophilic stability. Water contact angle measurements, Fourier Transform Infrared Spectroscopy (FTIR) and Atomi…
Dielectric properties were compared between two kinds of low-density polyethylene (LDPE) composites prepared by adding near spherical MgO fillers with different diameters of around several ten nm and several ¿m. In the whole range of temperature from 0°C to 90°C, the conductivity is decreased and the permittivity is i…
To study deformation mechanisms using molecular dynamics, very high strain rates have to be applied. The effect of lowering the strain rate by two orders of magnitude on the deformation characteristics of nanocrystalline Al was investigated. For the highest strain rate, the onset of dislocation propagation is delayed,…
Optimization of the preparation process of vinblastine sulfate (VBLS)-loaded folateconjugated bovine serum albumin (BSA) nanoparticles for tumor-targeted drug delivery using response surface methodology (RSM) Yuangang Zu, Yu Zhang, Xiuhua Zhao, Qi Zhang, Yang Liu, Ru JiangKey Laboratory of Forest Plant Ecology, Northe…
A new nonlinear optical crystal, Na 3 VO 2 B 6 O 11, has been grown by the top-seeded solution growth method using a Na 2 CO 3 −V 2 O 5 flux. The structure of the compound was determined by single-crystal X-ray diffraction. It crystallizes in the noncentrosymmetric orthorhombic system, space group P 2 1 2 1 2 1, with…
The present study reports two bacteria, designated 87I and 112A, which were isolated from soil and activated sludge samples from Hyderabad, India, and that are capable of producing poly-3-hydroxybutyrate (PHB). Based on phenotypical features and genotypic investigations, these microorganisms were identified as Bacillu…