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: Ultrasonic-aided fabrication of gold nanofluids | Chen and Wen Nanoscale Research Letters 2011 6 198 http content 6 1 198 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Ultrasonic-aided fabrication of gold nanofluids Hui-Jiuan Chen Dongsheng Wen Abstract A novel ultrasonic-aided one-step method for the fabrication of gold nanofluids is proposed in this study. Both spherical- and plate-shaped gold nanoparticles GNPs in the size range of 10-300 nm are synthesized. Subsequent purification produces well-controlled nanofluids with known solid and liquid contents. The morphology and properties of the nanoparticle and nanofluids are characterized by transmission electron microscopy scanning electron microscope energy dispersive X-ray spectroscope X-ray diffraction spectroscopy and dynamic light scattering as well as effective thermal conductivities. The ultrasonication technique is found to be a very powerful tool in engineering the size and shape of GNPs. Subsequent property measurement shows that both particle size and particle shape play significant roles in determining the effective thermal conductivity. A large increase in effective thermal conductivity can be achieved approximately 65 for gold nanofluids using plate-shaped particles under low particle concentrations pM L . Introduction In recent years there have been intensive efforts in the synthesis and application of nanomaterials in different fields from energy to biomedicine sectors. Widespread interest has been generated in tailoring gold nanoparticles GNP for non-invasive medical applications either as a heating or a targeting agent for detection diagnosis or treatment 1 . GNPs are popularly chosen because of their unique physical and chemical properties such as high conductivity for both heat and electricity easy functionalization and bio-compatibility as well as prior clinical experience of gold-based pharmaceuticals. One example is in cancer therapy where functionalized GNPs are proposed as .
