Powder Adhesion and Agglomeration Induced by Ascorbic Acid at the Room Temperature

• Main Authors: Meng-Ting Su, 蘇孟婷
• Other Authors: Heng-Kwong Tsao
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/30779271597590688964

碩士 === 國立中央大學 === 化學工程與材料工程學系 === 104 === The experiment is designed to adhere the several powders which possess the different properties respectively on the polymer substrates with the strong adhesion induced by ascorbic acid and uses the tap testing to examine the excellent adhesion performance between the powders and the substrates. According to the different properties of the powders, the powder adhesion method induced by ascorbic acid can be used to create the functionalized surface. It can manufacture the flexible conductive patterns by adhering the conductive silver powders to the polyethylene terephthalate(PET) substrate with ascorbic acid, and its resistivity can reach 6 × 10-4  cm which is similar with the commercial silver conductive paste. Also, it can manufacture the flexible superhydrophobic surfaces by adhering the hydrophobic polytetrafluoroethene(PTFE) powders to the PET. The contact angle on this superhydrophobic surface can reach 161o, and due to the low contact angle hysteresis the 8 l water drop can roll fast with the only 4o sliding angle. By using the high-speed video camera and the contact angle system, various kinds of the motion of the liquid dorp on the superhydrophobic surface can be studied. Otherwise, the superhydrophobic and superlipophilic filter can be manufactured by adhering the PTFE powders on the filter with ascorbic acid, and it can be applied on the removal of the oil pollution on the water surface and the oil/water separation field. Finally, the adhesion performance can be examine by the lap-joint test, and the adhesion mechanism of the ascorbic acid will also be studied by controlling the different parameter of the solution and the substrates. In summary, the excellent adhesion of the ascorbic acid can be attributed to the synergistic effect of the liquid diffusion and the mechanical interlock.