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Some hints on using surface phenomena for the design and performance optimizati...

Tese de doutoramento em Engenharia Biomédica ; The surface properties of materials in contact with biological systems play a key role in determining the outcome of biological-material interactions. Most of the conventional materials do not meet simultaneously the demands required for biomaterials surface and bulk properties. An effective approach for optimizing biomaterials performance is to modify the surface...

Temperature as a single on-off parameter controlling nanoparticles growing, sta...

Plasma-induced polymerization as a tool for surface functionalization of polyme...

A commonly applied strategy in the field of tissue engineering (TE) is the use of temporary three-dimensional scaffolds for supporting and guiding tissue formation in various in vitro strategies and in vivo regeneration approaches. The interactions of these scaffolds with highly sensitive bioentities such as living cells and tissues primarily occur through the material surface. Hence, surface chemistry and topo...

Hydrophobic-electrostatic balance driving the LCST offset aggregation-redissolu...

A series of random terpolymers composed of N-isopropylacrylamide (NIPAAm), 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS), and N-tert-butylacrylamide (NTBAAm) monomers were synthesized by free radical polymerization. The molar fraction of the negatively charged monomer (AMPS) was maintained constant (0.05) for all studied terpolymer compositions. Turbidity measurements were used to evaluate the influence o...

Surface phosphorylation of chitosan significantly improves osteoblast cell viab...

Chitosan biocompatibility is often associated with the structural similarities with glycosaminoglycans (GAGs). Although all of the GAGs are built from repeating disaccharide units and some of them contain N-glucosamine (the main hexosamine in the chitosan backbone), all of them also contain negatively charged functional groups. These charged units are believed to have a crucial role for the formation of proteog...

Highly porous and interconnected starch-based scaffolds : production, character...

A convenient and straightforward process for preparation of highly porous and interconnected !ber mesh scaffolds with 50 wt.% content of starch is described. The proposed methodology avoids some of the previous encountered problems associated with the processing of starch-based materials such as thermal degradation, starch entrapment in the material bulk and inability to control/minimise the thickness of the !b...

Poly(N-Isopropylacrylamide) surface-grafted ghitosan membranes as a new substra...

The immobilization of poly(N-isopropylacrylamide) (PNIPAAm) on chitosanmembranes was performed in order to render membranes with thermo-responsive surface properties. The aim was to create membranes suitable for cell culture and in which confluent cell sheets can be recovered by simply lowering the temperature. The chitosan membranes were immersed in a solution of the monomer that was polymerized via radical in...

Effect of chitosan membrane surface modification via plasma induced polymerizat...

The surface of solvent cast chitosan membranes was modified using a two-step procedure. Oxygen plasma treatment was used at the first activation step followed by vinyl monomer graft polymerization. Two monomers were used in order to compare the influence of different functional groups on cell adhesion and proliferation; acrylic acid (AA) was used to introduce carboxyl groups and vinyl sulfonic acid (VSA) was us...