Potential in adsorption

Low field or contact potential measurements on well-defined macroscopic surfaces have an advantage here. The total amount of adsorbed material can be measured separately by flash desorption. Moreover, the contact potential A corresponds to an area average, which is also approached in low field emission measurements. The change in the contact potential in adsorption can therefore be unequivocally related to the dipole moment per adatom through Eq. (32). The difficulty in this approach lies in the preparation of a truly uniform surface of macroscopic size, which has not as yet been accomplished. 

In the past few years, great progress has been made for the applications of MOFs in analytical chemistry. Although some kinds of MOFs that are water instable have limited applications in analytical chemistry, MOFs that have good thermostability and water stability (such as ZIF and MIL MOFs) can be available in almost all the important aspects of modern analytical chemistry. With well-defined pore structures, MOFs have great potential in adsorption and adsorption-based separation. Also, MOFs have been engineered to specific forms such as columns, fibers, and films to meet various analytical challenges and... 

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