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Introduction
There are many applications for the assembly of polyelectrolyte films chemical and biological sensing, and electrochromics, for example. Layer assembly is a technique where alternating layers of positively and negativare assembled in sandwich-Two advantages of this technique over other thin control. Monitoring LbL assembly via a quartz crystal microbalance (QCM) is an accurate yet inexpensive technique that requires no expensive hardware such as atomic
or Langmuir-Blodgett. Assembly is usually by an alternating dip method or via a flow system.

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