Quartz Crystal Microbalance for the Transient Study of Electrode Processes

1995 ◽  
Vol 411 ◽  
Author(s):  
V. Daujotis ◽  
R Raudonis ◽  
V. Kubilius ◽  
E. Gaidamauskas ◽  
R. Sližys
Keyword(s):  
Surface Roughness ◽  
Quartz Crystal Microbalance ◽  
Oscillation Frequency ◽  
Quartz Crystal ◽  
Solution Viscosity ◽  
Electrode Processes ◽  
Initial Deviation ◽  
Frequency Responses ◽  
Faradaic Reaction ◽  
Transient Study

ABSTRACTA technique for the measurement of quartz supported electrode oscillation frequency with special reference to transient electrochemical experiments was prepared. Due to changes in solution viscosity and density and in surface roughness during potential step experiments, the error in calculation of mass changes from frequency responses can reach 3–5 %. Initial deviation of electron numbers from unity by 30–60% during pulse electroreduction of dicyanoargentate shows that this process is not a simple faradaic reaction.

scholarly journals Protein Adsorption to Titanium and Zirconia Using a Quartz Crystal Microbalance Method

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
You Kusakawa ◽  
Eiji Yoshida ◽  
Tohru Hayakawa
Keyword(s):  
Surface Roughness ◽  
Protein Adsorption ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Adsorption Rate ◽  
Force Microscopy ◽  
Atomic Force ◽  
A Cell ◽  
Addition Amount

Protein adsorption onto titanium (Ti) or zirconia (ZrO2) was evaluated using a 27 MHz quartz crystal microbalance (QCM). As proteins, fibronectin (Fn), a cell adhesive protein, and albumin (Alb), a cell adhesion-inhibiting protein, were evaluated. The Ti and ZrO2 sensors for QCM were characterized by atomic force microscopy and electron probe microanalysis observation, measurement of contact angle against water, and surface roughness. The amounts of Fn and Alb adsorbed onto the Ti and ZrO2 sensors and apparent reaction rate were obtained using QCM measurements. Ti sensor showed greater adsorption of Fn and Alb than the ZrO2 sensor. In addition, amount of Fn adsorbed onto the Ti or ZrO2 sensors was higher than that of Alb. The surface roughness and hydrophilicity of Ti or ZrO2 may influence the adsorption of Fn or Alb. With regard to the adsorption rate, Alb adsorbed more rapidly than Fn onto Ti. Comparing Ti and ZrO2, Alb adsorption rate to Ti was faster than that to ZrO2. Fn adsorption will be effective for cell activities, but Alb adsorption will not. QCM method could simulate in vivo Fn and Alb adsorption to Ti or ZrO2.

Modification of Polystyrene Morphology and its Influence to the Coated Zinc Phthalocyanine Layer and Frequency Change in QCM Sensor

2015 ◽  
Vol 827 ◽  
pp. 257-261 ◽  
Author(s):  
Masruroh ◽  
D.J.D.H. Djoko ◽  
Lalu A. Didik ◽  
Eka Rachmawati ◽  
Fadli Robiandi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Quartz Crystal Microbalance ◽  
Bovine Serum ◽  
Quartz Crystal ◽  
Zinc Phthalocyanine ◽  
Frequency Change ◽  
Polystyrene Surface ◽  
Influence Of Solvents

This study observed the influence of solvents on polystyrene regarding the layered morphologies of zinc phthalocyanine (ZnPc) and its influence on the bovine serum albumin (BSA) immobilization on quartz crystal microbalance (QCM) sensor. The larger surface width introduced by surface roughness of the polystyrene due to chloroform (CHCl3) as the solvents allows more ZnPc to be trapped within the polystyrene. Moreover, the wider surface width also increases the amount of ZnPc to be deposited on top of the polystyrene surface. Therefore, the ZnPc layer deposited onto polystyrene created with CHCl3 solvent is thicker than other solvents, which result in the largest ∆f of the ZnPc layer.

scholarly journals Adsorption Analysis of Lactoferrin to Titanium, Stainless Steel, Zirconia, and Polymethyl Methacrylate Using the Quartz Crystal Microbalance Method

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Eiji Yoshida ◽  
Tohru Hayakawa
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Zeta Potential ◽  
Polymethyl Methacrylate ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Contact Angles ◽  
Equilibrium Analysis ◽  
Value Analysis ◽  
Biofilm Development

It is postulated that biofilm formation in the oral cavity causes some oral diseases. Lactoferrin is an antibacterial protein in saliva and an important defense factor against biofilm development. We analyzed the adsorbed amount of lactoferrin and the dissociation constant (Kd) of lactoferrin to the surface of different dental materials using an equilibrium analysis technique in a 27 MHz quartz crystal microbalance (QCM) measurement. Four different materials, titanium (Ti), stainless steel (SUS), zirconia (ZrO2) and polymethyl methacrylate (PMMA), were evaluated. These materials were coated onto QCM sensors and the surfaces characterized by atomic force microscopic observation, measurements of surface roughness, contact angles of water, and zeta potential. QCM measurements revealed that Ti and SUS showed a greater amount of lactoferrin adsorption than ZrO2and PMMA. Surface roughness and zeta potential influenced the lactoferrin adsorption. On the contrary, theKdvalue analysis indicated that the adsorbed lactoferrin bound less tightly to the Ti and SUS surfaces than to the ZrO2and PMMA surfaces. The hydrophobic interaction between lactoferrin and ZrO2and PMMA is presumed to participate in better binding of lactoferrin to ZrO2and PMMA surfaces. It was revealed that lactoferrin adsorption behavior was influenced by the characteristics of the material surface.

Influence of surface roughness on quartz crystal microbalance measurements in liquids

2007 ◽  
Vol 101 (11) ◽  
pp. 114502 ◽  
Author(s):  
K. Rechendorff ◽  
M. B. Hovgaard ◽  
M. Foss ◽  
F. Besenbacher
Keyword(s):  
Surface Roughness ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal
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