表面力仪的改进及溶液中DLVO理论的验证  

Improvement on surface force apparatus and verification of DLVO theory in solution

作　　者：张中威[1] 谭业发[1] 董贵杨[1] 杨自双[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007

出　　处：《化学研究》2012年第3期16-20,共5页Chemical Research

摘　　要：改进了现有表面力仪,使之具有更低的造价和更高的实验精度.利用改进后的表面力仪测量了0.1mol/L的NaCl溶液中两云母表面间的作用力-距离曲线;通过与计算得到的曲线对比验证了DLVO理论.结果表明:在0.1mol/L的NaCl溶液中,两云母表面间在距离较大时的作用力测量值与DLVO理论值相符合,但在距离较小时测量值出现附加的短程斥力,且此斥力呈现指数衰减规律.Previously developed surface force apparatus （SFA） was reconstructed and modified so as to reduce cost and increase measurement precision. The modified SFA was adopted to measure the surface force-distance curves between two mica surfaces in 0.1 mol/L NaCl solution, and the DLVO theory was verified by comparing the measured data with the calculated curves. Results indicate that, in 0.1 mol/L NaCl solution, the measured forces are in good agreement with those described by DLVO theory when the distance between the two mica slices is large. However, when the distance between the two mica slices is short, an additional shortrange repulsive force is observed during the measurement, and the short-distance repulsive force is dominated by rule of exponential attenuation.

关 键 词：表面力仪 改进 DLVO理论 验证 

分 类 号：O647.1[理学—物理化学]