1,721,003 research outputs found
Combining tissue engineering and drug deliveryTissue Engineering Using Ceramics and Polymers
No full text
Sol–gel synthesis at neutral pH in W/O microemulsion: A method for enzyme nanoencapsulation in silica gel nanoparticles
No full textThe classical sol-gel synthesis of silica gels has been adapted to a W/O (micro)emulsion process under conditions that minimize denaturing effects on encapsulated enzymes. We have in particular focused on optimizing the purification procedures with the aim to produce water nanoparticles dispersions from W/O emulsions without the use of precipitation/sedimentation steps. A proof of principle of encapsulation has been conducted using horseradish peroxidase (HRP). Crown Copyright © 2006
A new process for cell microencapsulation and other biomaterial applications: Thermal gelation and chemical cross-linking in “tandem”
No full textThe very rapid gelation of a cell- or biomolecule-containing solution is at the basis of most processes employed in microencapsulation. Adequately quick ('instantaneous') gelation kinetics are provided by a number of phenomena based on physical association. On the other hand, physical gels are inherently reversible structures, which can be solubilized or disrupted in response to often poorly controllable phenomena in the environment of application, such as dilution, changes in temperature, ion strength and composition, pH, or other physical or chemical parameters. Chemically cross-linked hydrogels would have therefore significant advantages in terms of stability and end-properties; however, the time required for chemical reactions to produce a chemically cross-linked material is in a more general case hardly compatible with microencapsulation processes. In a recent study of our laboratory we have proposed a new approach for providing both quick gelation kinetics and good stability, by simply combining the rapid kinetics of a physical hardening phenomenon with a slower chemical curing; the former process is thus responsible of the morphogenesis of the material, while the latter develops its end-properties. © 2005 Springer Science + Business Media, Inc
Hybrid bionanomaterials based on nanocrystalline TiO2and catechol-grafted polymers: The effect of composition and morphology on photo and bioactivity
No full textEnzymatic cross-linked hydrogel: role of Lysyl oxidase as an initiator of fibroblast inflammatory response
No full textPolimeri per ottica non lineare: copolimeri basati su cromofori contenenti il gruppo 2-fenilbenzossazolo
No full text
Absorption and emission dichroism of polyethylene films with molecularly dispersed push-pull terthiophenes
No full textSubstituted terthiophenes act as excellent chromophores for linear polarizers based on oriented polyethylene thin films. The dispersibility in the polymer matrix exerts a determining role on the optical performances. The modulation of the crystallization of the dye by attaching to the chromophoric moiety different linear or branched alkyl chains and by varying the polyethylene disordered phase (from UHMWPE to LLDPE) allows to obtain different extent of molecular dispersion. Scanning electron microscopy (SEM) and x-ray microanalysis help in determining the detailed morphology of the binary blend films. After uniaxial stretching, the films from molecularly dispersed dyes show excellent dichroic properties in absorption with dichroic ratios up to 60. On the contrary, the anisotropy in emission of the same films is lower than for the corresponding films from more aggregated dyes owing to the more effective depolarization phenomena. (Graph Presented) Absorption spectra with parallel (0 ) and perpendicular (90 ) polarization to the drawing direction of a 0.8 wt.% V2/ UHMWPE film (draw ratio = 30) (left side) and drawing extent dependence of the dichroic ratio (R) of Y3/ and V2/ UHMWPE films (inset)
- …
