Materials Literature
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Abstract The tensile deformation of materials with Poisson's ratio smaller than 0.5 generates an additional free volume, which means that tensile creep under constant stress and temperature is a non‐iso‐free volume process. Fractional free volume rising proportionally to the creep strain accounts for a continuous shor…
Abstract A novel series of photocrosslinkable biodegradable polymers was prepared by a high‐temperature solution polycondensation from a dichloride of 4,4′‐(adipoyldioxy)dicinnamic acid (CAC) and alkane diols of various methylene lengths (HO(CH 2 ) n OH; n = 6–10) or poly(ethylene glycol)s (PEG) of various molecular w…
2,2'-[2,2-Bis(4-dimethylaminophenyl)ethenyl]biphenyl (1) is a strong electron donor that undergoes oxidative C-C bond formation to give a stable dication rac-2(2+), the 9,10-dihydrophenanthrene derivative substituted with two bis(4-dimethylaminophenyl)methylium chromophores. This dication salt regenerates the starting…
Composites of conjugated polymers poly(2-methoxy-5-(2‘-ethyl-hexyloxy)- p -phenylene vinylene) (MEH-PPV) and poly(2,3-diphenyl)phenylene vinylene) (DP-PPV) adsorbed to porous alumina (PA) membranes have been prepared. Time-integrated and time-resolved optical emission properties of these materials at 77 K have been st…
The adsorption of reactive dyes on sepiolite has been investigated in a series of batch adsorption experiments. Three reactive dyes (Everzol Black B, Everzol Red 3BS, Everzol Yellow 3RS H/C) were used in bottle adsorption studies. While no significant adsorption capacity was obtained for natural sepiolite, high-adsorp…
A series of Pd IV −(NO x ) complexes ( x = 1, nitrosyl; x = 2, nitro; x = 3, nitrate) has been synthesized. The nitrosyl derivative is the first palladium mononuclear derivative to be structurally characterized by X-ray diffraction methods.
The reaction of Ru(2)(mu-O(2)CMe)(4)Cl with approximately 2.5 equiv of HDAniF (HDAniF = N,N'-di(p-anisyl)formamidine) in refluxing THF resulted in the synthesis of cis-Ru(2)(mu-DAniF)(2)(mu-O(2)CMe)(2)Cl (1). This Ru(2)(5+)complex, which has two labile acetate groups occupying two equatorial cisoid positions, was used…
Electrochemical copolymers of 2,2‘-bis(3,4-ethylenedioxythiophene) (BiEDOT) and 3,6-bis(2-(3,4-ethylenedioxy)thienyl)- N -methylcarbazole (BEDOT− N MeCz) were prepared from nine comonomer solutions of varying concentration. The monomers exhibit low peak oxidation potentials ( E p,m ) that are in close proximity (BiEDO…
A new class of highly luminescent dyes is reported. The characteristic feature of these compounds is that a terpyridine fragment is closely appended to a boradiazaindacene moiety in such a way that cation binding to the vacant terpyridine causes strong perturbations of the photophysical properties of the boradiazainda…
Unusual spin coupling between Mo(III) and Mn(II) cyano-bridged ions in bimetallic molecular magnets based on the [Mo(III)(CN)(7)](4-) heptacyanometalate is analyzed in terms of the superexchange theory. Due to the orbital degeneracy and strong spin-orbit coupling on Mo(III), the ground state of the pentagonal-bipyrami…
Diffraction data from two non-isomorphous crystals (forms 1 and 2) of an artificial protein with a four-helix bundle motif, di-Co(II)-DF1-L13A, have been collected using synchrotron radiation. The phase of form 1 has been assigned using the group and minimal non-isomorphic supergroup relation between the space group o…
The very low temperature properties of two pyrochlore compounds, Yb2Ti2O7 and Gd2Sn2O7, were investigated using an ensemble of microscopic and bulk techniques. In both compounds, a first order transition is evidenced, as well as spin dynamics persisting down to the 20mK range. The transition however has a quite differ…
We derive an effective Hamiltonian for ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ in the dilute limit, where ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ can be described in terms of spin $F=3/2$ polarons hopping between the {\rm Mn} sites and coupled to the local {\rm Mn} spins. We determine the parameters of our model from microsco…
We perform a first principles calculation of the anomalous Hall effect in ferromagnetic bcc Fe. Our theory identifies an intrinsic contribution to the anomalous Hall conductivity and relates it to the k-space Berry phase of occupied Bloch states. The theory is able to account for both dc and magneto-optical Hall condu…
A unified approach for description of the anomalous critical current enhancement in dislocated, deoxygenated, and particle irradiated superconductors is proposed based on a novel concept of "active pinning" (pinning via external fields modified intrinsic Josephson junctions) and existence of various competitive forces…
Lennard-Jones glasses (made on a computer by quenching from liquid state coordinates) are studied in harmonic approximation. Vibrational eigenfrequencies and eigenvectors are found by exact diagonalization for models with periodic boundaries and N=(500, 2048, and 6980) atoms. We analyze the density of states, mobility…
The electronic structures of the localized $5f$ systems UTSn (T=Ni, Pd) have been investigated using photoemission spectroscopy (PES). The extracted U $5f$ PES spectra of UTSn (T=Ni, Pd) exhibit a broad peak centered at $\sim 0.3$ eV below $\rm E_F$ with rather small spectral weight near $\rm E_F$ (N$_f$($\rm E_F$)).…
The nano dimensions, graphitic surface chemistry and electronic properties of single walled carbon nanotubes make such a material an ideal candidate for chemical or biochemical sensing. Carbon nanotubes can be nondestructively oxidized along their sidewalls or ends and subsequently covalently functionalized with collo…
We have developed the large ampullate glands of the orb-web spider Nephila clavipes as a model system in which to study the production of a tissue-specific secretory protein. Through simple manipulations, the glands' fibroin production can be practically abolished and subsequently elicited into high levels of synthesi…
I Puente-Lee, P S Schabes-Retchkiman, J Rojas-García, L Ríos-Guerrero, R Herrera-Nájera; Morphology Of SBS–Modified Asphalt Using Low Vacuum SEM, Microscop