Materials Literature
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The dianionic NiN2S2 complex, Ni(ema)2-, ema=N,N'-ethylenebis-2-mercaptoacetamide, known as a reasonable model of the tripeptide complex Ni(CGC)2- (C=cysteine; G=glycine) with respect to the two carboxyamido nitrogens and cis-dithiolates in a (N2S2)4- ligand scaffold as found in acetyl CoA synthase, has been explored…
We have prepared different compositions in the Gd 2− y La y Zr 2 O 7 solid solution by mechanically milling stoichiometric mixtures of the corresponding oxides. Irrespective of their lanthanum content, as-prepared powder samples consist of single-phase anion-deficient fluorite materials, although the long-range orderi…
Abstract Novel biodegradable network films with elastic properties were prepared from trimesic acid (Y) and poly(ethylene glycol)s (PEGs) with different molecular weights (MW) and/or 4,7,10‐trioxa‐1,13‐tridecanediamine (I). Prepolymers prepared by a melt polycondensation were cast from N , N ′‐dimethylformamide soluti…
Stereochemical study of five 2-substituted N-vinylpyrroles obtained via the Trofimov reaction was carried out based on the experimental measurements of their 13C–1H and 13C–13C spin–spin coupling constants substantiated by the high-level ab initio calculations of the parent 2-methyl-N-vinylpyrrole. The title compounds…
Abstract A new family of 1D cooperative spin‐crossover polymers with general formula [{Fe(tba) 3 }X 2 ] · n H 2 O [tba = N ‐(4 H ‐1,2,4‐triazol‐4‐yl)benzamide; X = CF 3 SO 3 – , n = 2 ( 1 ), n = 0 ( 4 ); BF 4 – , n = 3 ( 2 ), n = 0 ( 5 ); 4‐CH 3 C 6 H 4 SO 3 – , n = 3 ( 3 ), n = 0 ( 6 )] has been synthesised and chara…
Atomistic molecular dynamics simulation and a simple continuum viscous flow model are employed to investigate the sintering of straight-chain nanoparticle aggregates. The results are used to develop a phenomenological sintering scaling law. The chain aggregates investigated consist of up to 80 primary particles of sil…
Multiple Stokes and anti-Stokes generation in the monoclinic tungstate MnWO 4 was observed under one-micron picosecond excitation. All the recorded Raman induced laser lines were identified and attributed to the SRS-promoted vibration mode (at ≈ 879 cm -1 ) of the crystal.
In the Santa Cruz and Chubut provinces, Patagonia, Argentina, kaolin deposits were formed by “in situ” alteration of volcaniclastic rocks, such as the Bajo Grande, Chon Aike or Marifil Formations, or by erosion, transportation, and deposition of residual clays in small basins. This paper describes the genesis; geology…
We report using poly(acrylamide-co-2-(dimethylamino)ethyl methacrylate, methyl chloride quaternized) cationic microgels as a porous colloidal template for biomimetic in situ silica mineralization, allowing the well-controlled synthesis of submicrometer-sized hybrid microgel--silica particles and porous silica particle…
Vascular smooth muscle cells (vSMCs) can switch between a contractile (differentiated) and a synthetic (dedifferentiated) phenotype. Synthetic, proliferative vSMCs are observed during embryogenesis, wound repair, and tissue engineering. The potential of isolated vSMCs to reverse this phenotypic modulation depends stri…
We apply elastic continuum theory to model critical parameters influencing the free-energy equilibrium configuration and the dynamic performance of a continuous and in-plane liquid crystal profile acting as a polarization grating. We present analytical expressions for the threshold voltage, critical thickness, and the…
Various sequences of single and double stranded DNA can wrap and colloidally stabilize single- walled carbon nanotubes in solution. The binding of divalent ions to these complexes results in a 10 meV emission energy red-shift of the photoluminescence of the nanotube. In this work, this optical modulation is linked to…
Abstract This work describes the interaction of alkaline, alkaline earth, transition metal, heavy metal, and lanthanide cations from nitrate solutions with synthetic polyamides. The polyamides have pendant structures acting as cation host moieties. The host subgroups are benzo‐12‐crown‐4, benzo‐15‐crown‐5, benzo‐18‐cr…
Photoinduced melting of charge order is calculated by using the exact many-electron wave function coupled with classically treated phonons in the one-dimensional quarter-filled Hubbard model with Peierls and Holstein types of electron-phonon couplings. The model parameters are taken from recent experiments on ${(\math…
Various kinds of cellulose/cellulose-aggregate films have been prepared on newly cleaved mica by the deposition of the suspensions of microcrystalline cellulose in water in the presence or in absence of NaOH/thiourea at different temperatures. The topochemistry of the cellulose surfaces have been directly observed by…
The question of losses in metamaterials that are based upon magnetic resonances deriving from split-ring arrays is addressed through the use of active inclusions designed from diode arrays. A full discussion of the way in which the current-voltage characteristics of the inclusions are deployed to produce gain is given…
In an extension of our previous studies of BaTiO3, SrTiO3, and PbTiO3(001), as well as BaTiO3 and SrTiO3(011) surfaces [1–6], I present and discuss the results of calculations of BaZrO3(001) surface relaxation and rumpling with two different terminations (BaO and ZrO2), and BaZrO3(011) polar surface relaxation with th…
Abstract In this paper, a poly( ε ‐caprolactone) (PCL)‐based shape memory polyurethane fiber was prepared by melt spinning. The shape memory switching temperature was the melting transition temperature of the soft segment phase mainly composed of PCL at 47°C. The mechanical properties especially shape memory effect we…
Four reaction pathways from diborane and ammonia to borazine, (HBNH)3, have been studied computationally at the density functional level (B3LYP/6-311+G(2d,p)//B3LYP/6-31G(d)). The cycloaddition of H2BNH2 to 1,3-diaza-2,4-diborabuta-1,3-diene and subsequent elimination of two molecules of H2 was found to be the lowest-…
Original and simple procedures for glassy carbon electrode modification with polyoxometalates (POMs), phosphotungstate [H7P8W48O184]33-, and Co(II)-containing silicotungstates [Co6(H2O)30{Co9Cl2(OH)3(H2O)9(beta-SiW8O31)3}]5- and [{Co3(B-beta-SiW9O33(OH))(B-beta-SiW8O29OH)2}2]22- give stable and very active surfaces fo…