EXPERIMENT 1 油学 华东 Surface tension determination with the maximum differential pressure method ●●●●● Wang zeng bao 2012.11
Surface tension determination with the maximum differential pressure method Wang Zengbao 2012.11 EXPERIMENT 1
●●● ●●●● ●●●●● 1. Experimental purposes ●●●● ●●●●● ●●●● 1)Master the principles and methods of maximum differential pressure method for the determination of surface tension (2)Measure the surface tension of n-butyl alcohol solution and understand the concept of surface tension and influencing factors (Learn Gibbs equation and its applications
1. Experimental purposes (1)Master the principles and methods of maximum differential pressure method for the determination of surface tension. (2)Measure the surface tension of n-butyl alcohol solution, and understand the concept of surface tension and influencing factors. (3)Learn Gibbs equation and its applications
●●● ●●●● 2. Experimental principles ●●●●● ●●●● ●●●●● ●●●● Polyacrylamide can be synthesized from acrylamide triggered by ammonium persulfate: CONH CON Polyacrylamide can hydrolyze in alkaline solution, which generates partially hydrolyzed polyacrylamide -ICH2-CHfn yH,O+ NAoh- CONH -FCH2-CHixFCH2-CHtv-FCH2-CH1+(+zNH31 CONH 2 COOH COoNa
2. Experimental principles Polyacrylamide can be synthesized from acrylamide triggered by ammonium persulfate: Polyacrylamide can hydrolyze in alkaline solution, which generates partially hydrolyzed polyacrylamide: nCH2 CH CONH2 (NH4 ) 2 S2 O8 [CH2 CH] n CONH2 [CH2 CH] n CONH2 + yH2 O + zNaOH [CH2 CH] x CONH2 [CH2 CH] y COOH [CH2 CH]z COONa + (y + z)NH3
●●● ●●●● 2. Experimental principles ●●●●● ●●●● ●●●●● ●●●● 20 △P R △P— The additional pressure which is formed when the water drops down in the wide mouth bottle R>I R=工 R>I The surface tension 2 (N/m) 20, I(1):R-The curvature radius of the bubble
R P P R P 2 1 2 1 1 1 2 p r = 2 2 2 p r = 2 2 1 1 p p = （1） R P 2 = P R —The additional pressure which is formed when the water drops down in the wide mouth bottle —The curvature radius of the bubble —The surface tension （N/m） 2. Experimental principles
●●● ●●●● 2. Experimental principles ●●●●● ●●●● ●●●●● ●●●● 20 △P= R 20 20 R>I R=工 R>I Therefore, at the same temperature, once the aPl, AP2 are measured, and the IFT of the liquid(water) whose IfT is known is found out according to the temperature table, then we can calculate the ift of the unknown liquid from the formula
1 1 2 p r = 2 2 2 p r = 2 2 1 1 p p = Therefore, at the same temperature, once the ΔP1, ΔP2 are measured, and the IFT of the liquid(water) whose IFT is known is found out according to the temperature table,then we can calculate the IFT of the unknown liquid from the formula 。 （1） R P 2 = 2. Experimental principles