Materials Literature
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Abstract The plasticizing effect of glycerol and the crosslinking effect of formaldehyde and calcium chloride on the mechanical and thermomechanical properties of whey protein-based films were studied. Increased plasticizer content increased the percentage of solubility in water and decreased the mechanical resistance…
Aluminosilicate glasses containing rare-earth and rare-earth analogue cations such as Y 3+ and La 3+ are interesting for a variety of technological applications, as well as for elucidating general principles of glass formation and structure. We present high-resolution 17 O and 27 Al NMR data on a series of lanthanum a…
We probe the structure−dynamics relationship in melts of star polymers with high functionality using small-angle X-ray scattering, rheology, and Monte Carlo computer simulations. These materials represent model steric soft spheres, which order in a liquidlike structure on a macromolecular scale because of the impenetr…
Two poly(propyleneimine) dendrimers bearing up to 32 photoisomerizable azobenzene groups in the periphery have been used as potential hosts for eosin Y (2‘,4‘,5‘,7‘-tetrabromofluorescein dianion). The all- E azobenzene dendrimers can be reversibly switched to their Z form by light excitation. Both the E and Z forms of…
In agreement with previous results reported for colloidal silver clusters, effective surface-enhanced Raman cross sections of about 10- 16 cm 2 per molecule, corresponding to enhancement factors on the order of 10 14 , have also been obtained for molecules attached to colloidal gold clusters. Spatially isolated nearly…
A class of degradable, phase-segregated multiblock copolymers is presented. The new copoly(ester-urethane)s, termed DegraPolTM/btgc, consist of crystallizable poly[(3-R-hydroxybutyrate)-co-(3-R-hydroxyvalerate)]-segments and amorphous segments from ε-caprolactone, diglycolide and ethylene glycol. As junction unit an a…
Silica fume (SF) or microsilica is related mainly with preparation of High Resistance Concrete. This has justified its use -together with portland cement (I-42'5/SR,MR) and an superfiuidifying additive- in the preparation of a concrete whose value for compressive mechanical resistance at early ages (only 5 to 10 hours…
The main factors of deterioration that affect the Cathedral of Baeza are of a natural origin, basically thermic and hydraulic. Two types of calcarenite were employed in the construction of the major part of this building: one 'franca" of medium porosity and another "viva" harder and more compact, both extracted from t…
We report large third-order nonlinear optical susceptibilities (?3?)(ijkl) of new tetrathiafulvalene derivatives, using the degenerate four-wave mixing (DFWM) method. To understand the physical nature of the optical nonlinearities, we separate their electronic and nuclear contributions. The electronic contribution to…