Materials Literature
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Abstract A unique, geometry‐optimized, surface‐enhanced Raman scattering (SERS) fiber‐optic sensor has been recently developed and built. Though this class of sensors can be very useful in many applications, their use is greatly hindered by the fact that their reusability can hardly be achieved because of the irrevers…
Stark gekoppelte, regio- und diastereomerenreine Subphthalocyanin-C60-Dyaden (siehe Kalottenmodell; B orange, C hellblau, H grau, N blau, O rot), die durch dreifache Addition erhalten wurden, können, abhängig vom Abstand zwischen den beiden komplementären π-Oberflächen, auf Photoanregung unterschiedlich reagieren (mit…
Lineare Beziehungen werden beobachtet, wenn man für die Hydrierung ungesättigter Aldehyde an Platinoberflächen die Energien der Übergangszustände () gegen die Energien der Vorstufenzustände () aufträgt (siehe Bild; FS=Endzustand). Mithilfe dieser Beziehung können die Energiebarrieren substituierter Derivate schnell un…
Layer-by-layer assembly has shown a great deal of promise in biomedical coatings, as well as local drug delivery systems. The poor loading capacity of hydrophobic drugs within the multilayers is a drawback in their potential applications. Herein, sulfonated hyperbranched polyether (HBPO-SO(3)) with a hydrophobic core…
Cubic Lu 2 O 3:Eu 3+ nanorods, nanosheets, and nanoparticles are synthesized by a hydrothermal approach by adjusting the pH values of the precursor solutions. The unique luminescence properties of the nanocrystals are presented by the appearances of a long tail at the long-wavelength side of the charge transfer band (…
In this paper, the relaxation modulus of a single spun yarn is modeled in terms of the relaxation modulus of the constituent fibers of the yarn. A generalized Maxwell model is employed to describe the viscoelastic characteristic function of individual fibers subject to a given step function of tensile strain. The ther…
Neu unter die Lupe genommen: Die Strukturen Vanadyl-terminierter Monomere, Trimere (siehe Bild) und Oligomere auf einer CeO2(111)-Oberfläche wurden mit einer Kombination hochentwickelter experimenteller und theoretischer Methoden in atomarer Auflösung untersucht. Die CeO2-Oberfläche stabilisiert Vanadiumoxidspezies im…
The authors have studied low threshold lasing in dye-doped cholesteric liquid crystals (CLCs). We designed and synthesized a dye, 1,3,6,8-tetrakis(6'-hexyloxy-2-naphthyl)pyrene, which has high quantum yield Φ= 0.85. Since the transition dipole moment is perpendicular to the local director of a host CLC, laser oscillat…
Hydrophilic poly(ethylene glycol) (PEG) was grafted onto poly(4-cinnamic acid)-co-poly(3,4-cinnamic acid) (PCA) by Michael addition. The chemical structures of the PCA-graft-PEG (PCA-PEG) copolymers were confirmed by FT-IR and (1)H NMR measurements. The PCA-PEG nanoparticles were self-assembled by the solvent mixing m…
The effects of operating parameters on the corrosion of carbon steel in the monoethanolamine (MEA)−H 2 O−CO 2 −O 2 −SO 2 system were investigated using two different corrosion measurement techniques. The corrosion studies were conducted using a 273A potentiostat using MEA, O 2, and SO 2 concentrations and CO 2 loading…
Presently polycarboxylic acids are being used for cellulose crosslinking. Among these, 1,2,3,4-buthanetetracarboxylic acid (BTCA) is the most effective in combination with a corresponding catalyst. In this research, a comparison of crosslinking effects on mercerized cotton fibers and viscose was identified using certa…
Electrospinning was used to make activated carbon nanofibers with polyacrylonitrile (PAN) as the precursor. The applied voltage was found to be more influential on electrospun PAN fiber diameters than the flow rate and needle tip-collector distance. Tensile load and tear strength of electrospun PAN membranes increased…
In the present work, coir was chemically treated first with sodium perchlorate and then with 2,4-dinitrophenyl hydrazine (DNPH) to improve the mechanical properties of the coir−PP composites. Untreated, oxidized, and DNPH-treated coir samples at different mixing ratios were utilized to prepare the composites. Mechanic…
Abstract Die lebende kationische Ringöffnungspolymerisation von 2‐Oxazolinen ist seit ihrer Entdeckung 1966 eingehend untersucht worden. Die Vielseitigkeit der lebenden Polymerisation ermöglicht die Copolymerisation verschiedener 2‐Oxazolin‐Monomere zu Polymeren mit einstellbaren Eigenschaften; so lassen sich z. B. hy…
A two-step, microreaction system, operating at two different temperatures and incorporating three-dimensional, serpentine microchannels, was used for the continuous synthesis of CdSe/ZnS and CdS/ZnS nanocrystals. By varying the feed ratios of the precursors, we were able to control the size of both CdSe and CdS nanocr…
Novel peptides capable of binding to self-assembled peptide nanomaterials were identified from a random heptapeptide library displayed on phages. Affinity-dependent peptide screening against helically coiled nanofibers constructed of beta-sheet peptides gave phage clones displaying peptides with a variety of affinitie…
Shape memory alloys (SMAs) have been used in various applications since their discovery. However, their use as actuation devices in high-temperature environments has been limited due to the temperature constraints of commercially available materials. Recently, SMAs that produce good work characteristics at elevated te…
Superhydrophobic surfaces are generated by chemisorption on aluminum substrates of fluorinated block copolymers synthesized by reversible addition-fragmentation chain transfer in supercritical carbon dioxide. In an appropriate solvent, those block copolymers can form micelles with a fluorinated corona, which are graft…
We developed a family of polymer-drug conjugates carrying the combination of the anticancer agent epirubicin (EPI) and nitric oxide (NO). EPI-PEG-(NO)8, carrying the highest content of NO, displayed greater activity in Caco-2 cells while it decreased toxicity against endothelium cells and cardiomyocytes with respect t…
We demonstrate a new approach to fabricate highly ordered arrays of nanoscopic palladium dots and wires using switchable block copolymer thin films. The surface-reconstructed block copolymer templates were directly deposited with palladium nanoparticles from a simple aqueous solution. The preferential interaction of t…