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不同ｐＨ紫膜（Ｐｕｒｐｌｅ ｍｅｍｂｒａｎｅ，简称 ＰＭ）悬浮液（ｐＨ＝ ４～１１）分别和正电性的 聚氯化二甲基二丙烯铵（ｐｏｌｙ（ｄｉｍｅｔｈｙｌｄｉａｌｌｙｌａｍｍｏｎｉｕ ｃｈｌｏｒｉｄｅ），简称 ＰＤＡＣ）溶液均可 采用交替静电吸附沉积方法形成一系列多层复合膜．运用紫外－可见吸收光谱和石英晶 体微天平（ｑｕａｒｔｚ ｃｒｙｓｔａｌ ｍｉｃｒｏｂａｌａｎｃｅ，简称 ＱＣＭ）技术跟踪了 ＰＤＡＣ／菌紫质 （ｂａｃｔｅｒｉｏｒｈｏｄｏｐｓｉｎ，简称ｂＲ）膜的沉积过程，结果表明紫膜碎片与 ＰＤＡＣ具有均匀交替 成膜的特点．所有复合膜在光照时均可产生一定极性的光电压，ｐＨ＜７时，形成Ｍ态的 光电压呈现负极性，表明沉积膜上紫膜碎片的外表面面向基片； ｐＨ≥７时，则呈现正极 性，表明沉积膜上紫膜碎片的内表面面向基片．此外，所有复合膜上Ｍ态都呈现出较长 的寿命．而且，高 ｐＨ值时， Ｍ态的寿命比低ｐＨ值时相对要长，大约在３０ｍｉｎ内完全衰 减为基态．
Different pH (Purple membrane, PM for short) suspension (pH = 4 ~ 11) and the positive electrode of poly (dimethyldiallylammoniu chloride, referred to as PDAC) solution can be alternately static Adsorption deposition method to form a series of multi-layer composite membrane. The deposition process of PDAC / bacteriorhodopsin (bR) films was followed by UV-visible absorption spectroscopy and quartz crystal microbalance (QCM) technique. The results showed that the purple films and PDAC had uniform alternating deposition specialty. All the composite films could generate a certain voltage when they were exposed to light. When the pH value was less than 7, the voltage of M state formed a negative polarity, indicating that the outer surface of the purple film on the deposited film was facing the substrate. At pH ≥7, The positive polarity is exhibited, indicating that the inner surface of the purple film fragments on the deposited film faces the substrate. In addition, all composite membranes exhibit a longer lifetime in the M state. Moreover, at high pH, the M-state lifetime is relatively longer than at low pH, decaying completely to ground state in about 30 min.