scholarly journals Sensing of Adsorption Induced Phase Behavior of Stimuli-sensitive Polymer Hydrogel Using Quartz Crystal Microbalance

2007 ◽  
Vol 32 (3) ◽  
pp. 783-786
Author(s):  
Yoshimi Seida ◽  
ltaru Sato ◽  
Keiko Taki ◽  
Yoshio Nakano
Keyword(s):  
Phase Behavior ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Polymer Hydrogel ◽  
Stimuli Sensitive

Lipid phase behavior studied with a quartz crystal microbalance: A technique for biophysical studies with applications in screening

2016 ◽  
Vol 145 (20) ◽  
pp. 204904 ◽  
Author(s):  
Astrid Peschel ◽  
Arne Langhoff ◽  
Eva Uhl ◽  
Aruna Dathathreyan ◽  
Susanne Haindl ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Lipid Phase ◽  
Biophysical Studies

scholarly journals Quartz Crystal Microbalance Monitoring of Poly(Vinyl Alcohol) Sol during the Freeze–Thaw Process

2016 ◽  
Vol 5 (3) ◽  
pp. 42
Author(s):  
Yoshimi Seida ◽  
Mitsuteru Ogawa
Keyword(s):  
Porous Structure ◽  
Phase Behavior ◽  
Quartz Crystal Microbalance ◽  
Vinyl Alcohol ◽  
Quartz Crystal ◽  
Free Water ◽  
Silica Gels ◽  
Poly Vinyl Alcohol ◽  
Freeze Thaw ◽  
Pore Size Distributions

<p class="1Body">A quartz crystal microbalance (QCM) working under cryo-conditions was applied to analyzing the gelation and/or phase behavior of poly(vinyl alcohol) (PVA) sol during repeated freeze–thaw processes. The development of a porous structure with the gelation of PVA sol during the freeze–thaw cycle was examined in terms of the thermal behavior of the water in the sol and the viscoelastic behavior of the sol through thermal and QCM analyses. Water was liberated from the hydrophilic PVA during the freeze–thaw process through the aggregation of PVA. The water decreased the freezing temperature and increased the melting temperature because of the development of the porous structure with gelation by the thermal treatment. The state of the water during the gelation was estimated from the phase transition temperature and enthalpy change of the water during the thermal scan by using water-saturated silica gels with a series of pore size distributions. The viscoelasticity of the PVA sol during the freeze–thaw process was measured by cryo-QCM using admittance analysis (QCM-A). The free water and/or porous structure in the PVA sol was found to increase from the viscoelastic point of view by QCM measurements showing a shift in the resonance parameters (<em>f</em><sub>s</sub>, <em>R</em><sub>1</sub>). A hard gel was confirmed to form by the decrease in <em>f</em><sub>s</sub> and the increase in <em>R</em><sub>1</sub> with the thermal scan treatment. The cryo-QCM was found to be an effective probe for clarifying the gelation and phase behavior of PVA sol in detail with high resolution.</p>

Demonstration of Molecular Sensing Using QCM Device Coated with Stimuli-sensitive Hydrogel

2012 ◽  
Vol 1498 ◽  
pp. 151-156 ◽  
Author(s):  
Yoshimi. Seida ◽  
Yuri Nakano ◽  
Yoshio Nakano
Keyword(s):  
Resonance Frequency ◽  
Quartz Crystal ◽  
Impedance Analysis ◽  
Stimuli Responsive ◽  
Polymer Hydrogel ◽  
Molecular Sensing ◽  
Resonance Behavior ◽  
Highly Sensitive ◽  
Stimuli Sensitive ◽  
Collapse Phase

ABSTRACTMolecular sensing using stimuli-responsive viscoelastic property of amphiphilic polymer hydrogel was demonstrated. Thermo-responsive poly(N-isopropylacrylamide); NIPA, hydrogel immobilizing bovine serum albumin (BSA) in its polymer chain was synthesized on the AT-cut QCM (Quartz crystal microbalance). The device was provided to the sensing of anti-BSA antibody. The resonance behavior of QCM in response to the adsorption of anti-BSA antibody on the hydrogel was observed based on both the resonance frequency and resistance of QCM with impedance analysis. The QCM device coated with the LCST polymer hydrogel revealed a characteristic resonance behavior in response to the adsorption of anti-BSA antibody in the collapse phase of gel at which the gel lost most of its hydrated water. The resonance frequency and resistance in the collapsed gel were highly sensitive and their changes in response to the target adsorption were much larger than in the swelling state of gel. The use of the device at the LCST of NIPA gel is ideal because the largest amplification of the adsorption signal is available along with the largest phase change of NIPA gel.

Interaction of Clear Flavor Emulsions Containing Lemon Essential Oils with Lipid Bilayers via a Quartz Crystal Microbalance

2019 ◽  
Vol 25 (6) ◽  
pp. 879-884
Author(s):  
Takahiro Sakai ◽  
Hayato Seki ◽  
Shogo Yoshida ◽  
Hayato Hori ◽  
Hisashi Suzuki ◽  
...  
Keyword(s):  
Essential Oils ◽  
Lipid Bilayers ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal

Effect of Current Distribution on Quartz Crystal Microbalance Measurements

1998 ◽  
Vol 145 (2) ◽  
pp. 492-497 ◽  
Author(s):  
James J. Kelly ◽  
K. M. Anisur Rahman ◽  
Christopher J. Durning ◽  
Alan C. West
Keyword(s):  
Quartz Crystal Microbalance ◽  
Current Distribution ◽  
Quartz Crystal
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