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Quartz micro balance
Transcript of Quartz micro balance
Effect Which crystals are piezoelectric? References - Publications http://www.creationscience.com/onlinebook/webpictures/radioactivity-piezoelectric_effect.jpg
visited on October 20th 2012 11:37 Bhagavantam, S.; Suyanarayana, D., Acta Cryst.; 1949; 2; 21-26
Voinova, M. V.; Rohdahl, M.; Jonson, M.; Kasemo, B. Phys. Scripta 1999; 59; 391-396
Zafiu, Christian et al.; Phys. Chem. Chem. Phys., 2011, 13, 3478–3483
Cho, Nam-Joon; Nature Protocols, 2010, 6, No. 6, 1096-1106 almost every group without a centre of symmetry twenty of thirty-two crystallographic room groups are piezoelectric Why using quartz? http://skywalker.cochise.edu/wellerr/students/silica/project_files/image004.jpg
visited on Oct. 20th, 2012 14:42 It has got several benefits and there are historical reasons It is commercially available (today it almost excusively synthetical grown) and therefore quite cheap
mechanical and chemical resistance
An AT-cut quartz has got a very low temperature coefficient AT-cut quartz http://www.4timing.com/images/atbtcut.gif
visited on Oct., 20th 2012 14:34 Functioning of a quartz crystal
visited on Oct. 20th 2012 15:55 every crystal has got an eigenfrequency which is driven by alternating potential and influenced by many parameters Thank you for your
attention Reference - Reviews Basics of A Quartz Crystal Microbalance. Rev. 1.2 2/14/2012 Gamry Instruments, Inc.
Smith, Allan: The Quartz Crystal Microbalance, The Handbook of Thermal Analysis and CalorimetryVolume 5 , Elsevier it is changed by adding mass - adsorption the Sauerbrey equation and by the viscosity the Voigt-Voinova model the eloctrochemical quartz crystal microbalance combination with cyclic voltammetry obsevation of electrochemical processes on the working electrode can be done http://www.sci.muni.cz/~labifel/files/images/pristroje/EQCM.jpg visited on Oct. 21st 2012 08:46 Surface(S)-layer proteins http://micro.cornell.edu/cals/micro/research/labs/angert-lab/images/cellwall1.jpg
visited on Oct. 21st, 2012 08:51 object of investigation Lysinibacillus sphaericus
bottom-up nanostructuring technologies parameters for the self-assembling process point of zero charge: electrode potential, where the charge density on the surface is zero
Cations like Ca influence the self assembling process ++ neutral or slightly positive from the pzc negative from the pzc and some applications for observing biological membranes
Oct. 24 , 2012 th SLB - supported lipid bilayer http://www.win.tue.nl/~mpeletie/Research/membr-1a-small.jpg
visited on Oct. 21st, 2012 13:18 mimic biological membranes
sensor techniques self assembling process SUV...single unilamellar vesicle SLB-formation on silicondioxide SLBs on titaniumdioxide interesting properties because of its biocompatibility
SLB formation does not happen spontaneously
AH-protein (from Hepatitis C virus) destabilisizes SUVs
presuming electrostatic interaction http://www.bridgerdds.com/Portals/0/images/implantroot.jpg
visited on Oct. 21st, 2012 13:51 Alpha-helical (AH) proteins to form SLBs on titaniumdioxide