Cationic gold nanorods

Gorelikov et al. [150] demonstrated a way to provokephotothermally modulated volume transitions in microgel particles in the near-IR spectral range. Gold nanorods with different aspect ratios (from 2 to 6) stabilized by cationic surfactant were inte-... 

Niidome, Y., Honda, K., Higashimoto, K., Kawazumi, H., Yamada, S., Nakashima, N., Sasaki, Y., Ishida, Y. and Kikuchi, J.-i. (2007) Surface modification of gold nanorods with synthetic cationic lipids. Chem. Commun., 3777-3779. 

Functionalization of nanorods with polyelectrolytes has been carried out by layer-by-layer deposition (92). First, CTAB-coated nanorods are prepared. Since these nanorods are positively charged, they can adsorb cationic and anionic poly electrolytes. Functionalization of nanorods with dyes is possible a fluorescent dye, 4-chloro-7-nitrobenzofurazan has been functionalized on the surface of Ti02 nanorods (93). Functionalization with a photoactive molecule such as ruthenium(II) tris(bipyridine) is also possible (94). A thiol derivative of the bipyridyl complex (Ru(bpy)3+-Cs-SH) in dodecane thiol is used for the functionalization of gold nanorods. Functionalization of block magnetic nanorods is very useful (95), for example, in the separation of proteins. Consider a triblock nanorod consisting of only two metals, Ni and Au. If the Au blocks are functionalized with a thiol (e.g. 11-amino-1 undecane thiol) followed by covalent attachment of nitrostreptavidin, then one can... 

B. Nikoobakht and M. A. El-Sayed, Evidence for bilayer assembly of cationic surfactants on the surface of gold nanorods, Langmuir, 17(20), 6368-6374 (2001). 

Y. Niidome et al.. Surface modification of gold nanorods with synthetic cationic lipids. Chemical Communications, 36, 3777-3779 (2007). 

Nitrogen Mustard-1, a Chemical Warfare Agent, has been detected with a modified electrode prepared by electrochemically immobilizing, in the presence of the cationic surfactant cetyltrimethylammonium bromide, copper phthalocyanine nanorods into polypyrrole formed by the polymerization of pyrrole on gold. A linear correlation in the range 0.256 x 10 " -0.384 x 10 M was found, with a detection limit of 6.4 x 10 M [45]. 

Early non-viral techniques involved the direct injection of naked DNA through the use of electrical impulses (electroporation), or bombardment with gold particles (gene gun), to force them across cellular membranes. However, these methods were inefficient, localized, and scarcely versatile. Non-viral carriers were developed using cationic lipids, polymers, carbon nanotubes, metal nanorods, and ceramic- and silica-based nanoparticles (Nishikawa Huang, 2001 Roy et al., 2003, 2005, 2008 Mintzer Simanek, 2009). 

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