Materials Literature
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Specific monomer sequences in aromatic copolyimides are recognized through their π-stacking and hydrogen-bonding interactions with a sterically and electronically complementary molecular tweezer. These interactions enable the tweezer molecule to “read” monomer sequences comprising up to 27 aromatic rings by multiple a…
The variation of the activation enthalpy for surface oxygen exchange O2+⇄+2 h. with sample composition in (Ln,Sr)(Mn,Fe,Co)O3−z perovskites is rigidly coupled to the variation of the overall reaction enthalpy (see picture). This is the first mechanistically well-established example of a Hammett-like relationship for i…
Abstract A clay-rich Callovo-Oxfordian sedimentary formation was selected in the eastern Paris Basin (MHM site) to host an underground laboratory dedicated to the assessment of nuclear waste-disposal feasibility in deep geological formations. As described initially, this formation shows a mineralogical transition from…
Abstract The dehydration and rehydration processes of the clay mineral palygorskite (PFl-1) were studied by textural analysis, thermogravimetric analysis connected with mass spectrometry (TGA-MS), and 29 Si and 1 H solid-state NMR techniques. The TGA-MS results clearly reveal weight losses at maxima of 70°C, 190°C, 43…
Abstract Poly(lactic acid) (PLA)/starch blends were prepared blending with dioctyl maleate (DOM). DOM acted as a compatibilizer at low concentrations (below 5%), and markedly improved tensile strength of the blend. However, DOM functioned as a plasticizer at concentrations over 5%, significantly enhancing elongation.…
FeCo Prussian blue analogues, which are known as typical molecule-based magnets, exhibited abrupt conductance switching by applying a high electric field as well as by varying the temperature. The current density versus electric field (J-E) curves of FeCo Prussian blue with Rb cations in interstitial sites shows so-ca…
Experimental evidence of the d-f Coulomb interaction responsible for the resonant x-ray scattering (RXS) from antiferroquadrupolar order in DyB2C2 is presented. The energy dependences of the RXS intensity with polarization analysis are analyzed by considering the interference between the resonances of dipolar (E1) and…
A comprehensive theoretical study of the reaction mechanisms for the conversion between spiropyrans (SPs) and the open form of merocyanines (MCs) has been conducted by theoretical calculations. The reaction mechanisms on the ground- and triplet-state potential energy surfaces (PESs) were investigated using the density…
Heavy carbon doping of MgB$_2$ is studied by first principles electronic structure studies of two types, an ordered supercell (Mg(B$_{1-x}$C$_{x}$)$_{2}$,x=0.0833) and also the coherent potential approximation method that incorporates effects of B-C disorder. For the ordered model, the twofold degenerate $σ$-bands tha…
The paper had been withdrawn due to some technical problems. New version will be uploaded near future.
Polyaniline (PANI) and mercaptosuccinic-acid-capped gold nanoparticles (MSAG NP ) can form stable multilayer films prepared by the layer-by-layer method. The MSAG NP inside the multilayer films can effectively dope PANI and shift its electroactivity to neutral pH, which makes it feasible to use these layers in bioassa…
We show that the density and temperature dependences of the α-relaxation time of several glass-forming polymers can be described through a single scaling variable X = e (ρ)/ T , where e (ρ) is well fitted by a power law ρ x , x being a species-specific parameter. This implies that “fragility” is an intrinsic, density-…
Made-to-measure nanobelts: Metastable vanadium dioxide single-crystal nanobelts (see picture) were prepared by a hydrothermal reduction method by treating an ammonium metavanadate solution with formic acid. The morphology of the belts could be adjusted by varying the reaction parameters, such as temperature, pH, and r…
Vertebrate collagen fibrils are heterotypically composed of a quantitatively major and minor fibril collagen. In non-cartilaginous tissues, type I collagen accounts for the majority of the collagen mass, and collagen type V, the functions of which are poorly understood, is a minor component. Type V collagen has been i…
A series of mesoscopically ordered silicas with different pore sizes, pore connectivity, and pore geometry have been studied as carrier matrices for controlled drug delivery systems. Ibuprofen was used as a model drug, and the release processes were monitored under in vitro conditions. The adsorption of ibuprofen from…
In this article, ultrafine gelatin (Gt) fibers were successfully produced with the use of the electrical spinning or electrospinning technique. A fluorinated alcohol of 2,2,2-trifluoroethanol (TFE) was used as the dissolving solvent. The morphology of the electrospun gelatin fibers was found to be dependent on the alt…
Quantum Magnetics has developed a Quadrupole Resonance (QR) system for the detection of anti-tank and anti-vehicle landmines. The QR confirmation sensor (QRCS) is a part of the Army GSTAMIDS Block 1 program and is designed to confirm the presence of landmines initially flagged by a primary sensor system. The ultimate…
In this paper we present an overview of the method of surface differential reflectivity (SDR) for the study of semiconductor surfaces. We will describe the principles of the technique and the experimental apparatus together with some theoretical considerations concerning the connection of SDR with the microscopic prop…
In this paper we present re-analyses of magnetostriction measurements earlier performed in terbium, dysprosium and holmium single crystals. In the framework of the standard theory of single-ion crystal-electric-field and two-ion exchange magnetostrictions, we explain the thermal variation of the anisotropic saturation…
Within the effective interfacial Hamiltonian approach we evaluate the excess line free energy associated with hemicylindrical droplets of volatile liquid sessile on a stripe-like chemical inhomogeneity of a planar substrate. In the case of short-range intermolecular forces the droplet morphology and the corresponding…