Materials Literature
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The suitability of frequency-dependent alternating-current scanning electrochemical microscopy (4D AC-SECM) for investigation of thin passivating layers covering the surface of corrosion-inhibited metals has been demonstrated. Inhibition of copper corrosion by benzotriazole (BTAH) and methylbenzotriazole (MBTAH), whic…
The electrochemical behavior of the low-melting copper salts [ Cu ( Me C N ) x ] [ Tf 2 N ] and [ Cu ( Ph C N ) x ] [ Tf 2 N ] ( x = 2 – 4 ) , where MeCN is acetonitrile and PhCN is benzonitrile, is presented. In these compounds, the copper(I) ion is a main component of the ionic liquid cation. Consequently, the coppe…
Abstract The mass loss rate (MLR) of poly(methyl methacrylate) (PMMA) exposed to known radiant fluxes is simulated with two recently developed numerical codes, the National Institute of Standards and Technology (NIST) Fire Dynamics Simulator (FDS) and the Federal Aviation Administration (FAA) ThermaKin. The influence…
The hydration processes of T1‐C 3 S and β‐C 2 S and their mixtures 70‐30 and 30‐70 (% in weight) have been followed by conduction calorimetric studies. The synergy of the T1‐C 3 S and β‐C 2 S hydration reactions, across their mixtures in proportions of 70‐30 and 30‐70, has been studied through the quantification of th…
Einen einzigartigen Eisencofaktor (FeGP-Cofaktor) enthält die [Fe]-Hydrogenase, die die reversible Hydrierung von Methenyltetrahydrometanopterin (Methenyl-H4MPT+) mit H2 zu Methylen-H4MPT katalysiert (siehe Bild). Eisenchromophor-Circulardichroismus(CD)-Daten stützen die Annahme, dass die Bindung von Methenyl/Methylen…
We report a templating effect of uniaxially oriented melt-drawn polyethylene (MD-PE) films on α-helical poly(L-lysine)/poly(styrenesulfonate) (α-PLL/PSS) complexes deposited by the layer-by-layer (LBL) method. The melt-drawing process induced an MD-PE fiber texture consisting of nanoscale lamellar crystals embedded in…
The goal of this work is to establish the technical feasibility of producing activated carbon from pulp mill sludges. KOH chemical activation of four lignocellulosic biomass materials, two sludges from pulp mills, one sludge for a linerboard mill, and cow manure, were investigated experimentally, with a focus on the e…
The leucine zipper region of activator protein-1 (AP-1) comprises the c-Jun and c-Fos proteins and constitutes a well-known coiled coil protein-protein interaction motif. We have used molecular dynamics (MD) simulations in conjunction with the molecular mechanics/Poisson-Boltzmann generalized-Born surface area [MM/PB(…
We present an efficient and accurate computational approach to study phase-coherent quantum transport in molecular and nanoscale electronics. We formulate a Green's-function method in the recently developed ab initio nonorthogonal quasiatomic orbital basis set within the Landauer-B\"uttiker formalism. These quasiatomi…
The dependence of field emission properties of titanium dioxide (TiO(2)) nanotubes (NTs) has been studied as a function of NT diameter (D) and height (h), which varied in the ranges 18-500 nm and 500-12,000 nm, respectively. The studies showed a strong dependence of the field emission on these parameters. With an incr…
Abstract The synthesis and first host–guest investigations of a (Zn)porphyrin‐tethered calixarene are described. The target compound was obtained by selective copper‐catalyzed alkyne/azide cycloaddition at one position of a tris‐azide‐substituted calixarene using an alkyne‐functionalized (Zn)porphyrin. After the compl…
In solid-armature railguns, hypervelocity gouging damage can significantly limit the useful life of rails. Most solutions to this problem have involved the use of hard rail materials, which tend to be poor electrical conductors. However, it has also been observed that precoating the conductors of a railgun can signifi…
The mechanism of serine proteases prominently illustrates how charged amino acid residues and proton transfer events facilitate enzyme catalysis. Here we present an ultrahigh resolution (0.93 Å) x-ray structure of a complex formed between trypsin and a canonical inhibitor acting through a substrate-like mechanism. The…
Versatile synthesis of fluorescent, carbohydrate-functionalized oligothiophene hybrids via Sonogashira-type cross coupling reactions is reported. The mannose derivatives reveal specific binding with the model lectin from Canavalia enisformis (Concanavalin A).
A negatively charged dye, 8-hydroxypyene-1,3,6-sulfonic acid trisodium salt (HPTS), was successfully incorporated into a silica matrix by using a positively charged polyelectrolyte, poly (diallyldimethylammoniumchloride) (PDADMAC) as a bridge. The positive charges of PDADMAC were partially neutralized by HPTS upon the…
The synthesis, characterization, and device studies of poly(benzobisoxazole imide)s containing perylene or naphthalene units in an alternating fashion with the oxazole unit are described. Photoinduced energy transfer and charge separation were studied in methanesulfonic acid (MSA) solution via absorption, excitation,…
Abstract A series of block copoly(arylene ether)s containing pendant superacid groups were synthesized, and their properties were investigated for fuel cell applications. Two series of telechelic oligomers, iodo‐substituted oligo(arylene ether ketone)s and oligo(arylene ether sulfone)s, were synthesized. The degree of…
Liquid nitrogen (LN2) is used as the cryogen and dielectric for many high temperature superconducting, high voltage applications. When a quench in the superconductor occurs, bubbles are generated which can affect the dielectric breakdown properties of the LN2. Experiments were performed using plane-plane electrode geo…
Glass-PA (EC-G-PA), Jute-PA (EC-J-PA), Glass-Jute-Glass (EC-GJG-PA), Jute-Glass-Jute (EC-JGJ-PA) composites of epoxy resin of bisphenol-C (EBC) have been prepared using a hand lay-up technique at 150°C under 27.58 MPa pressure for 6 h by using phthalic anhydride as a curing agent. EC-G-PA, EC-J-PA EC-GJG-PA and EC-JGJ…
Pyridine-functionalized β-diketone ligands of the type 1-(2-pyridyl)-3-(4-n-alkyloxyphenyl)propane-1,3-dione [HLR(n)py] (R = C6H4OCnH2n + 1, n = 12 (1), 14 (2)) were carried to react with the BF2 fragment giving rise to the corresponding adducts [BF2(LR(n)py)] (n = 12 (5), 14 (6)) which were characterized and their lu…