Model films are getting more and more important due to very well defined properties regarding to the surface chemistry. Such model systems are suitable for studies of surfaces and their interaction with different functional groups. Characterizations of such model films are easy to perform and techniques such as quartz crystal microbalance (QCM) can be used for in situ adsorption studies. Quartz crystal microbalance with dissipation monitoring (QCM-D) is one of a few techniques that give direct information on the adsorption process in situ . It is based on the change in resonance frequency of a thin AT-cut piezoelectric quartz crystal disk that oscillates in the shear mode when AC voltage is applied across electrodes. The resonant frequency changes with the mass deposited on the crystal surface, rendering QCM a very sensitive mass sensor. Due to its high resolution, it is a powerful device in a variety of technological applications and it is of great importance for adsorption studies in liquid environments. Some practical examples and possible use of QCM-D will be pointed out. After adsorption, the treated model surfaces (model PET films, cellulose model films …) could be characterized with AFM imaging or other surface techniques such as XPS or ATR-FTIR.
Dan je kraći pregled primjene QCM-D tehnike. U sklopu UKF projekta “Confined DNA” (http://soft.ifs.hr), Institut za fiziku nabavlja QCM-D, uređaj koji služi za karakterizaciju mekih tankih filmova, tj. praćenje depozicije bio/makro/molekula na površinama. Naglasili bismo kako QCM-D ima mnoge primjene u biomedicini, biokemiji, biofizici (http://www.q-sense.com/publications).
Hrvatskog biofizičkog društva i Instituta za fiziku