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Adsorption studies of dodecylamine at the quartz interface using an electrode-separated piezoelectric sensor |
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| Authors: | Dazhong Shen Songmin Peng Qi Kang and Yanhui Xue |
| Institution: | (1) Chemistry College, Shandong University, 250100, Jinan, P.R. China, CN;(2) Changsha Engineering and Research Institute of Non-ferrous Metallurgy, 410011, Changsha, P.R. China, CN;(3) Shandong Institute of Mining and Technology, 270019, Taian, P.R. China, CN |
| Abstract: | The adsorption process of dodecylammonium chloride (DAC) from aqueous solutions onto a quartz crystal interface was investigated in situ using an electrode-separated piezoelectric sensor (ESPS). Increasing amounts of DAC adsorbed onto a quartz crystal surface resulted in linearly decreasing oscillating frequencies of the ESPS. The adsorption density can be monitored by the frequency decrease. The adsorption density obtained by calculation using the Sauerbrey equation in the ESPS method is greater than that in solution depletion method. A calibration coefficient is added into the Sauerbrey equation to correct the influence of surface roughness of the quartz crystal on the adsorption density. The influence of solution properties on the adsorption density measurement was discussed. A dependence of the adsorption density on pH was reported. Received: 17 April 1997 / Revised: 1 December 1997 / Accepted: 7 December 1997 |
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