Adsorption of Lipid Vesicles on Hydrophobic Surface Investigated by Quartz Crystal Microbalance

Langmuir ◽  
2001 ◽  
Vol 17 (6) ◽  
pp. 1999-2007 ◽  
Author(s):  
Tai Hwan Ha ◽  
Kwan Kim
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Hydrophobic Surface ◽  
Lipid Vesicles

scholarly journals Understanding the Dehydration Stress in Lipid Vesicles by a Combined Quartz Crystal Microbalance and Dielectric Spectroscopy Study

2020 ◽  
Vol 217 (13) ◽  
pp. 1900986
Author(s):  
Alessia Gennaro ◽  
Olivier Deschaume ◽  
Helge Pfeiffer ◽  
Carmen Bartic ◽  
Patrick Wagner ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Dielectric Spectroscopy ◽  
Quartz Crystal ◽  
Lipid Vesicles ◽  
Dehydration Stress ◽  
Spectroscopy Study

Hydrophobicity of Nanostructured Films Characterized by a Quartz Crystal Microbalance

2012 ◽  
Author(s):  
Pengtao Wang ◽  
Majid Charmchi ◽  
Mengyan Shen ◽  
Hongwei Sun
Keyword(s):  
Quartz Crystal Microbalance ◽  
Nanoimprint Lithography ◽  
Quartz Crystal ◽  
Mechanical Impedance ◽  
Hydrophobic Surface ◽  
Electrospinning Process ◽  
Polymer Surfaces ◽  
Double Layers ◽  
Pmma Film ◽  
Nanostructured Polymer

The hydrophobicity of two types of nanostructured polymer films were fabricated and characterized with a novel quartz crystal microbalance (QCM) technique to investigate their static and dynamic hydrophobic properties. The nanofibrous films of polymethylmethacrylate (PMMA), PMMA/Polydimethylsiloxane (PDMS) and Polyacrylonitril (PAN) were prepared with an electrospinning process and a PMMA film with nanoscale roughness was fabricated using nanoimprint lithography (NIL) technique. Significantly different static and dynamic hydrophobicities (wettability) were found among these films and the correlation between hydrophobicity and the mechanical impedance of QCM to these films were developed both experimentally and theoretically. It was shown that QCM is capable of quantitatively characterizing the hydrophobicity of these nanostructured polymer surfaces. For nanofibrous films, the double layers — a viscoelastic nanofiber film and a liquid layer result in a nonlinear combination of mechanical impedances of QCM. To simplify the analysis, an apparent viscosity was introduced in the analysis to take into account the interactions between liquid and polymer surfaces. For NIL PMMA film, the hydrophobicity was altered by coating nano-roughened surface with a Teflon layer. The reduction in the mechanical impedance of QCM clearly demonstrates the enhancement of hydrophobicity. The experimental results showed that the hydrophobic surface lead to a small mechanical impedance while the hydrophilic surface resulted in a large mechanical impedance of QCM.

Experimental Study of Drag Reduction on Superhydrophobic Surfaces Using Quartz Crystal Microbalance (QCM)

2017 ◽  
Author(s):  
Hamed Esmaeilzadeh ◽  
Keqin Zheng ◽  
Junwei Su ◽  
Joey Mead ◽  
Margaret J. Sobkowicz ◽  
...  
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Single Layer ◽  
Mechanical Impedance ◽  
Hydrophobic Surface ◽  
Superhydrophobic Surfaces ◽  
Double Layers ◽  
Nanostructured Polymer ◽  
Solid Foundation ◽  
Coating Formulation

A durable superhydrophobic coating formulation with epoxy binder thermoset was used to coat on surfaces, which provide high quality for corrosion protection, reduced biofouling and improved hydrodynamic behavior. The single and double layers coating of these nanostructured epoxy were fabricated and coated on a novel quartz crystal microbalance (QCM) technique to investigate their hydrophobic properties. Different static and dynamic wettability were obtained and characterized by evaluating the electrical impedance of QCM coated with nanostructured epoxy in air and DI water. It was found that QCM is able to quantitatively characterize the hydrophobicity of these nanostructured polymer surfaces. For double layer coating, the frequency shift in DI water was smaller in comparison to the single layer one. The reduction in mechanical impedance of QCM clearly demonstrates the effect of enhanced hydrophobicity for both single and double layers. The experimental results show that the hydrophobic surface resulted in smaller mechanical impedance loading, while the hydrophilic surface exerted much larger mechanical impedance. The outcome of this research will build a solid foundation for the further improvement of vehicles coated with superhydrophobic surfaces operating in water and increased equipment life.

Phase transitions in adsorbed lipid vesicles measured using a quartz crystal microbalance with dissipation monitoring

Soft Matter ◽  
2011 ◽  
Vol 7 (22) ◽  
pp. 10749 ◽  
Author(s):  
Gabriel Ohlsson ◽  
Anna Tigerström ◽  
Fredrik Höök ◽  
Bengt Kasemo
Keyword(s):  
Phase Transitions ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Lipid Vesicles

Hydrophobicity of Electrospun Nanofibers Films Characterized by a Quartz Crystal Microbalance

2010 ◽  
Author(s):  
Pengtao Wang ◽  
Minghao Song ◽  
Sai Liu ◽  
Hongwei Sun
Keyword(s):  
Quartz Crystal Microbalance ◽  
Apparent Viscosity ◽  
Quartz Crystal ◽  
Electrospun Nanofibers ◽  
Mechanical Impedance ◽  
Hydrophobic Surface ◽  
Impedance Analysis ◽  
Electrospinning Process ◽  
Hydrophilic Surface ◽  
Nanofiber Film

The quartz crystal microbalance (QCM) sensor is used to study the dynamic characteristic of hydrophobic nanofiberous surfaces. The nanofibrous films of polymethyl methacrylate (PMMA), PMMA/ Polydimethylsiloxane (PDMS) and Polyacrylonitrile (PAN) were prepared with an electrospinning process for different hydrophobicity (wettability). The mechanical impedance analysis of DI water on a fibrous coated QCM surface is able to quantitatively characterize the hydrophobicity of these nanofibers surfaces. The two layers including a viscoelastic nanofiber film and a liquid layer result in a nonlinear combination of mechanical impedances. To simplify the analysis, an apparent viscosity was introduced in the analysis to account for the surfacial slip effect. The experimental results showed that the hydrophobic surface resulted in small mechanical impedance loading and low value of apparent viscosity, while the hydrophilic surface generated large mechanical impedance and gave high value of apparent viscosity.

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