In this paper, the impact on microwave radiation and UV cross-linking of the course of reaction of obtaining chitosan hydrogels was presented. The synthesis were conducted using either commercial chitosan and Beetosan - chitosan derived from naturally died honeybees as well as using mixed systems containing both chitosan and Beetosan. The swelling capacity of obtained hydrogel materials as well as their tendency to degradation in distilled water and simulated body fluid have been tested. Moreover, morphology of the surface of selected samples using scanning electron microscope was characterized. Furthermore, the contact angles (θ) of attained materials were defined using geometrical method by applying a drop of liquid on the surface of the tested material. ...
The article describes the selection of reaction parameters for preparing magnetic nanoparticles (nanoFe3O4) by Massart's synthesis. However, the magnetic nanoparticles belong to a group of unstable systems and rapidly agglomerate. Therefore, in the second step of the synthesis encapsulation of magnetic nanoparticles usung gold nanoparticles (nanoFe3O4/Au) in the presence of a suitable stabilizer was conducted. Hence, the synthesis was carried out in the presence of 10% (wt.) solution of PVP, 0.1 M sodium citrate and 3% solution of gum arabic. Such synthesis were conducted at room temperature and at 80°C. Progress of the reaction was monitored using UV-Vis spectrophotometry. The resulting magnetic-nanogold encapsulated nanoparticles were analyzed using X-ray diffraction. What is more, for selected samples the average particle size was determined using dynamic light scattering (DLS). ...
Hydrogels (known also as superabsorbents, SAPs-Super Absorbent Polymers) belong to the group of polymers, which has recently become increasingly popular. These compounds are used in many fields, with particular emphasis on medicine and pharmacy. In this paper the synthesis of hydrogels based on chitosan which matrix was modified with products of natural origin (ie. extract of Salvia and bee pollen) and nanoparticles of gold or silver was carried out. The resulting hydrogels were tested for sorption capacity, as well as their tendency to degradation in simulated body fluid was determined. What is more, wettability of the attained materials was also defined. The obtained results confirmed that the introduction of additions to the hydrogel matrix has an impact on the physico-chemical properties of tested materials. ...
The paper presents a synthesis of the hydrogel materials by photopolymerization. A series of materials differing in the amount of photoinitiator was prepared. In these studies the ability of swelling of attained materials was determined. What is more, incubation studies were also carried out. Measurements of contact angles was conducted and a chemical structure of obtained materials was defined using FT-IR spectroscopy. On the basis of the research the impact on the amount of the photo-initiator on the structure of a polymeric material have been defined. Synthesized materials were characterized by a different degree of the cross-linking, and therefore they have different properties. Hence the conclusion that possibility of the structure modifying of the material creates more opportunities for its use. ...
