Materials Literature
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ABSTRACT Dated sediment cores from five alpine lakes (>3200 m asl) in Rocky Mountain National Park (Colorado Front Range, USA) record near‐synchronous stratigraphic changes that are believed to reflect ecological and biogeochemical responses to enhanced nitrogen deposition from anthropogenic sources. Changes in sed…
“Drogenschmuggel”: Präpariert wurden Micellen aus Blockcopolymeren und dem Tumortherapeutikum Adriamycin (ADR), das über einen pH-sensitiven Linker an das Polymer gebunden ist (siehe Bild). Die Micellen gelangen durch Endocytose, unter Umgehung der Zellmembrantransporter, in die Krebszelle. Innerhalb der Zelle löst ei…
Abstract The conversion of processed discarded material into valuable by‐products and alternative specialty materials has been identified as a timely challenge for food research and development associated with numerous applications of chitinous products. Chitin, chitosan, calcareous chitin, and chitosan, N ‐acetylated…
Composite materials with thermoplastic matrices and a reinforcement of natural fibers are increasingly regarded as an alternative to glass fiber-reinforced composites. The substitution of the traditionally used reinforcing glass fibers by natural fibers such as flax, kenaf, or cotton can lead to a reduction of the com…
Small and attractive: The proligand citric acid has been used to assemble a new anionic hexanuclear cobalt(II) cluster (see picture). The complex displays single-molecule magnet (SMM) behavior, with an energy barrier to the reorientation of magnetization of 26 K, the highest value to have been recorded for a non-manga…
This paper is primarily focused in studying the effects of nanoclay particles such as montmorillonite on improving mechanical and thermal properties of fiber reinforced polymer matrix composite materials. Basic correlations between polymer morphology, strength, modulus, toughness, and thermal stability of thermoset na…
The subunit interfaces of 122 homodimers of known three-dimensional structure are analyzed and dissected into sets of surface patches by clustering atoms at the interface; 70 interfaces are single-patch, the others have up to six patches, often contributed by different structural domains. The average interface buries…
We present the design and implementation of a periodically loaded transmission line, which simultaneously exhibits negative refractive index (NRI) and negative group delay (and, hence, negative group velocity). This is achieved by loading the transmission line in series with capacitors and RLC resonators and in shunt…
Magnetostrictive Terfenol-D (Tb(x)Dy(1-x)Fe2) and piezoelectric (Pb(Zr(1-x)Ti(x))O3) magnetoelectric (ME) laminate composites have been investigated experimentally for various modes of operation: longitudinal magnetized/longitudinal polarized (L-L mode), transverse magnetized/longitudinal polarized (T-L mode), and tra…
We study a composite medium consisting of insulating magnetodielectric spherical particles embedded in a background matrix. Using results from the literature going back as far as Lewin (1947), we show that the effective permeability and permittivity of the mixture can be simultaneously negative for wavelengths where t…
Here, we analyze the transverse-magnetic (TM) wave interaction with a pair of slabs, one being an epsilon-negative (ENG) layer in which the real part of permittivity is assumed to be negative while its permeability has positive real part, and the other being a mu-negative (MNG) layer that has the real part of its perm…
We report a method for the preparation of colloidal ZnO-diluted magnetic semiconductor quantum dots (DMS-QDs) by alkaline-activated hydrolysis and condensation of zinc acetate solutions in dimethyl sulfoxide (DMSO). Mechanistic studies reveal that Co(2+) and Ni(2+) dopants inhibit nucleation and growth of ZnO nanocrys…
This paper develops a quasi-analytical and self-consistent model to compute the polarizabilities of split ring resonators (SRRs). An experimental setup is also proposed for measuring the magnetic polarizability of these structures. Experimental data are provided and compared with theoretical results computed following…
Drug smuggling: Micelles made up of block copolymers and the anticancer drug adriamycin (ADR), which is linked to the polymer by a pH-sensitive linker, have been prepared (see picture). Treatment of cancer cells with the micelles shows that the micelles are transported into the cell by endocytosis, thus bypassing the…
This paper reviews biodegradable synthetic polymers focusing on their potential in tissue engineering applications. The major classes of polymers are briefly discussed with regard to synthesis, properties and biodegradability, and known degradation modes and products are indicated based on studies reported in the lite…
Abstract For Abstract see ChemInform Abstract in Full Text.
Umicore IR Glass is a company specialising in the production of chalcogenide glasses and moulded optics. The standard glass compositions are GASIR1 (Ge<sub>22</sub>As<sub>20</sub>Se<sub>58</sub>) and GASIR2 (Ge<sub>20</sub>Sb<sub>15</sub>Se<sub>65</sub>). These materials are transparent in the 3-5 μm and 8-12 μm…
BaTi 0.975 Zr 0.025 O 3 thick films were prepared by a screen-printing method on Pt bottom electrodes using silicon substrates in the firing temperature range from 1330°C to 1370°C. The high-temperature sintering of Pt bottom electrodes and Ba(Ti,Zr)O 3 thick films was successfully achieved using silicon substrates wi…
Thin films of calcium-strontium bismuth titanate (Ca 1- x Sr x )Bi 4 Ti 4 O 15 solid solution were fabricated on (111)Pt/Ti/SiO 2 /(100)Si substrates by a chemical-solution deposition (CSD) technique. These films had x = 0–1.00 and consisted of a polycrystalline structure with random orientation of the bismuth layer-s…
Polarization hysteresis properties of ferroelectric gate capacitors were investigated using a quasi metal-ferroelectric-metal-insulator-semiconductor (MFMIS) capacitor which was constructed by the series connection of a metal-ferroelectric-metal (MFM) capacitor and a metal-insulator-semiconductor (MIS) capacitor. By t…