tailieunhanh - Báo cáo hóa học: " Dispersion of single-walled carbon nanotubes modified with poly-l-tyrosine in water"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Dispersion of single-walled carbon nanotubes modified with poly-l-tyrosine in water | Kojima et al. Nanoscale Research Letters 2011 6 128 http content 6 1 128 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Dispersion of single-walled carbon nanotubes modified with poly-l-tyrosine in water 12 3 4 1 1 Mio Kojima Tomoka Chiba Junichiro Niishima Toshiaki Higashi Takahiro Fukuda Yoshikata Nakajima Shunji Kurosu4 Tatsuro Hanajiri1 4 Koji Ishii5 Toru Maekawa1 4 Akira Inoue1 4 Abstract In this study complexes composed of poly-l-tyrosine pLT and single-walled carbon nanotubes SWCNTs were produced and the dispersibility of the pLT SWCNT complexes in water by measuring the z potential of the complexes and the turbidity of the solution were investigated. It is found that the absolute value of the z potential of the pLT SWCNT complexes is as high as that of SWCNTs modified with double-stranded DNA dsDNA and that the complexes remain stably dispersed in the water at least for two weeks. Thermogravimetry analysis TGA and visualization of the surface structures of pLT SWCNT complexes using an atomic force microscope AFM were also carried out. Carbon nanotubes CNTs are promising functional nanomaterials which may initiate new industries in the twenty-first century thanks to their unique properties such as extremely high thermal conductivity and mechanical strength conducting or semiconducting characteristics depending on their chirality and so on and therefore there is a variety of possible applications of CNTs to a wide range of areas including bio-related ones . the development of biosensing bioelectrochemical and biomedical devices and drug delivery systems 1 . However one serious problem arises when CNTs are used in bio-related fields that is their poor dispersibility in water. There have been quite a few studies aiming at improving the dispersibility of CNTs in water by attaching foreign molecules such as DNA 2-6 proteins 7-10 polymers 11-18 surfactants 19-22 and other compounds 23-26 to CNTs. Wang et .