High-Frequency Rheological Characterization of Homogeneous Polymer Films with the Quartz Crystal Microbalance

Langmuir ◽  
2014 ◽  
Vol 30 (32) ◽  
pp. 9731-9740 ◽  
Author(s):  
Garret C. DeNolf ◽  
Lauren F. Sturdy ◽  
Kenneth R. Shull
Keyword(s):  
Quartz Crystal Microbalance ◽  
Polymer Films ◽  
High Frequency ◽  
Quartz Crystal ◽  
Rheological Characterization

Viscoelastic Characterization of Electrochemically Prepared Conducting Polymer Films by Impedance Analysis at Quartz Crystal

2006 ◽  
Vol 153 (7) ◽  
pp. C455 ◽  
Author(s):  
A. Arnau ◽  
Y. Jimenez ◽  
R. Fernández ◽  
R. Torres ◽  
M. Otero ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Polymer Films ◽  
Quartz Crystal ◽  
Impedance Analysis ◽  
Conducting Polymer Films

Quartz crystal microbalance characterization of electrochemical doping of polyaniline films

1993 ◽  
Vol 61 (3) ◽  
pp. 291-296 ◽  
Author(s):  
R.M. Torresi ◽  
S.I.Cordoba de Torresi ◽  
C. Gabrielli ◽  
M. Keddam ◽  
H. Takenouti
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Electrochemical Doping ◽  
Polyaniline Films

Characterization of Jumping-Droplet Condensation on Nanostructured Surfaces With Quartz Crystal Microbalance

2017 ◽  
Author(s):  
Junwei Su ◽  
Hamed Esmaeilzadeh ◽  
Chefu Su ◽  
Majid Charmchi ◽  
Marina Ruths ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Quartz Crystal Microbalance ◽  
Microscopic Observation ◽  
Quartz Crystal ◽  
Structured Surfaces ◽  
Nanostructured Surfaces ◽  
Acoustic Technique ◽  
Flow Condensation ◽  
Droplet Condensation

The spontaneously jumping motion of condensed droplets by coalescence on superhydrophobic surfaces has been an active area of research due to its great potential for enhancing the condensation efficiency. Despite a considerable amount of microscopic observations, the interfacial wetting characterization during jumping-droplet condensation is still notably lacking. This work focuses on applying a novel acoustic sensor - quartz crystal microbalance (QCM), to characterize the interfacial wetting on nanostructured surfaces during jumping-droplet condensation. Copper oxide nanostructures were generated on the surface of QCM with a chemical etching method. Based on the geometry of the nanostructures, we modified a theoretical model to reveal the relationship between the frequency shift of the QCM and the wetting states of the surfaces. It was found that the QCM is extremely sensitive to the penetrated liquid in the structured surfaces. Then, the QCM with nanostructured surface was tested on a customed flow condensation setup. The dynamic interfacial wetting characteristics were quantified by the normalized frequency shift of the QCM. Combined with microscopic observation of the corresponding drop motion, we demonstrated that partial wetting (PW) droplets with an about 25% penetrated area underwent spontaneously jumping by coalescence. However, the PW droplets no longer jumped when the penetrated area exceeds 50% due to the stronger adhesion between liquid and the surface. It shows that the characterization of the penetrated liquid in micro/nanostructures, which is very challenging for microscopic observation, can be easily carried out by this acoustic technique.

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