Chitosan membranes nanoparticles

Figure 16.6 Asymmetric chitosan membrane as skin wound dressing. 16.4.2.3 Nanoparticle...

Chitosan is one of the widely used biomaterials and has gained considerable attention in tissue engineering and regenerative medicine applications in recent decades. The importance comes from its biocompatibility, biodegradability and easy availability, as well as the possibility to be prepared in various forms such as films, membranes, nanoparticles, fibers, hydrogels and scaffolds. Chitosan is a linear polysaccharide and is obtained... 

Chitosan Membranes with Nanoparticles for Remediation of Chlorinated Organics... 

Membrane Synthesis The synthesis of chitosan membranes with embedded Fe nanoparticles is achieved by the simultaneous pore formation utilizing silica particles as porogen and the reduction of Fe by sodium borohydride, as described in Figure 8.2. 

Figure 8.7 XRD analysis for (a) chitosan membrane, (b) 1.30 mmol Fe Vg chitosan membrane, (c) 3.25 mmol Fe /g chitosan membrane, (d) Fe nanoparticles by NaBHt, and (e) Fisher electrolytic Fe.

Figure 8.8 TGA analysis for (a) chitosan membrane, (b) chitosan membrane with silica (6 wt% silica relative to membrane weight), and (c) chitosan-embedded Fe nanoparticles with silica (6 wt% silica and 7.5 wt% Fe relative to membrane weight).

Based on the permeation data, water showed the lowest membrane resistance of 57.47 cm (B = 0.9789), followed by ethanol with of 87.00 cm R = 0.9712). The highest resistance observed was the mixture of 1/1 volume ratio of ethanol and water with R of 131.60 R = 0.9893). The difference in the membrane resistances for different solvents shows that the flux through the chitosan-embedded nanoparticle membranes is affected not only by the polymeric materials used, but also by the solvent properties (viscosity, molar volume, polarity) and polymer-solvent interactions (surface tension, etc.). The influence of these parameters is being studied and reported in the literature (Machodo et al., 1999 Robinson et al., 2004). 

---