Mechanical dispersal of silver nanopowder in water using ultrasonic atomizer

• Main Authors: Manh Toan Nguyen, 阮孟全
• Other Authors: 鍾清枝
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/u82c76

碩士 === 國立臺北科技大學 === 機電整合研究所 === 96 === Nanoparticles have been widely applied into many fields of science, industry, and medicine, etc. However, agglomeration of nanoparticles always exists in every application involving nanoparticles, it strongly reduces the function of nanoparticles and becomes a big challenge. In this research dispersion was focused studied to solve the problem of nanoparticle agglomeration by original mechanical way, which has been considered as extremely difficult. The study proposed two new dispersing methods, where ultrasonic atomizer with the frequency of 1.6 MHz was used as dispersing apparatus. These dispersals were also compared to the well known conventional dispersals such as ultrasonic cavitation (20 kHz) and sonication bath (19 kHz) to evaluate the dispersing function of proposed dispersals. Dynamic light scattering, scanning electron microscope and transmission electron microscope were utilized to study distribution behavior of silver nanoparticles in colloid after dispersal. The experimental results indicated that, two proposed dispersing methods dispersed silver nanoparticles (25 nm in diameter) very homogeneously in water at room temperature with the small average size of dispersed particles (up to 100 nm) and narrow particle size range, a result is much better than that of two conventional dispersals. Moreover, colloids dispersed by two proposed methods were very stable with zeta-potential factor approximated or over 30 mV – stable level of colloid