Preparation and properties of chitosan/carbon nanotube nanocomposites using poly(styrene sulfonic acid)-modified CNTs
ABSTRACT Poly(styrene sulfonic acid)-functionalized carbon nanotubes (CNT-PSSA), which was obtained with atom transfer radical polymerization (ATRP), was utilized in preparation of chitosan/CNT nanocomposites (CH/CNT-PSSA). Chemical linkages between chitosan and CNTs form in the nanocomposites through the reaction between the sulfuric acid groups of CNT-PSSA and the amino groups of chitosan, to warrant the homogenous dispersion of CNTs. The CH/CNT-PSSA nanocomposites were superior to the neat chitosan polymer in thermal and mechanical properties, water and solvent uptakes, bond water ratios, and electrical conductivity. The attractive property of the CH/CNT-PSSA nanocomposites also implied their application potentials for separation membranes and sensor electrodes.
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ABSTRACT: A large amount of chicken bone is produced as waste from the protein industry all over the world and discarding it has become one of the important environmental concerns in recent time. The value addition to the waste bones including the isolation of hydroxyapatite (HAP) will reduce the dumping of these wastes on to the environment. HAP has been isolated from the waste chicken bones and the composite of functionalized multiwalled carbon nanotube (f-MWCNT)-chitosan-HAP has been prepared to improve the mechanical and thermal properties of HAP by the incorporation of chitosan and multiwalled carbon nanotube (MWCNT). MWCNT add mechanical and tensile strength whereas chitosan add binding and biocompatibility to the composite.International Journal of Pharmacy and Pharmaceutical Sciences 08/2012; 4:716-720. · 1.59 Impact Factor
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ABSTRACT: In this paper, synthesized (raw) multi-walled carbon nanotube (rMWCNTs) surfaces were modified with chitosan and β-cyclodextrin using Chen’s soft cutting technique. Raw and surface modified multi-walled carbon nanotubes were observed by transmission electron microscope (TEM). The results showed that chitosan and β-cyclodextrin could attach to the outer surface of nanotubes, wrapping the nanotubes axially. In contrast to the chitosan, β-cyclodextrin not only would attach to the inner and outer surface of the MWCNT walls but also fill their hollow section. It was also found that the surface modified MWCNTs were shorter and their dispersion in organic solvent (NMP) was better than r-MWCNTs. Sedimentation test revealed that dispersion of β-cyclodextrin surface modified MWCNTs was better stabilized in NMP solvent than the chitosan surface modified MWCNTs. Keywords: CNTs, Cyclodextrin, Chitosan, surface modification, functionalization, nanocomposite materials.Int. J. Nanosci. Nanotechnol. 01/2012; 8(2):71-78.
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ABSTRACT: Nucleic acids show immense potential to treat cancer, acquired immune deficiency syndrome, neurological diseases and other incurable human diseases. Upon systemic administration, they encounter a series of barriers and hence barely reach the site of action, the cell. Intracellular delivery of nucleic acids is facilitated by nanovectors, both viral and non-viral. A major advantage of non-viral vectors over viral vectors is safety. Nanovectors evaluated specifically for nucleic acid delivery include polyplexes, lipoplexes and other cationic carrier-based vectors. However, more recently there is an increased interest in inorganic nanovectors for nucleic acid delivery. Nevertheless, there is no comprehensive review on the subject. The present review would cover in detail specific properties and types of inorganic nanovectors, their preparation techniques and various biomedical applications as therapeutics, diagnostics and theranostics. Future prospects are also suggested.Drug Delivery and Translational Research. 10/2013; 3(4):446-470.