Quartz Crystal Microgravimetry
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Langmuir ◽  
2021 ◽  
Cornelius O. Audu ◽  
David Chen ◽  
Chung-Wei Kung ◽  
Randall Q. Snurr ◽  
SonBinh T. Nguyen ◽  

2020 ◽  
Vol 167 (11) ◽  
pp. 116510 ◽  
Noseung Myung ◽  
Hyo-Yoon Park ◽  
Hyung-Woo Jee ◽  
Eun Bee Sohn ◽  
Su Jin Lee ◽  

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2877
Pavel Chulkin ◽  
Mieczysław Łapkowski

The work addresses an issue of the conductivity phenomenon in conductive polymer thin films. Polyaniline was chosen as a broadly used and thoroughly investigated conductive polymer in order to test and show capabilities of the developed original approach based on impedance spectra analysis. A number of films of different thickness were deposited onto a Pt electrode surface and consequently investigated in aqueous solution containing perchloric acid as an electrolyte. The processes that occur in polyaniline film were studied by cyclic voltammetry, electrochemical quartz crystal microgravimetry (EQCM) and electrochemical impedance spectroscopy (EIS). The role of incorporated ions as charge carriers was investigated with respect to the control of the conductivity properties of the film. Along with detailed polyaniline behavior study, the work makes up a fundamental scientific impact on theoretical electrochemistry and electroanalytical techniques.

2019 ◽  
Vol 9 (1) ◽  
Ling Wang ◽  
Meri J. Lundahl ◽  
Luiz G. Greca ◽  
Anastassios C. Papageorgiou ◽  
Maryam Borghei ◽  

Abstract Coagulation is a critical process in the assembly of cellulose nanofibrils into filaments by wet spinning; however, so far, the role of the coagulation solvent has not been systematically elucidated in this context. This work considers organic non-solvents (ethanol, acetone) and aqueous electrolyte solutions (NaCl(aq), HCl(aq), CaCl2(aq)) for the coagulation of negatively charged cellulose nanofibrils via wet spinning. The associated mechanisms of coagulation with such non-solvents resulted in different spinnability, coagulation and drying time. The properties of the achieved filaments varied depending strongly on the coagulant used: filaments obtained from electrolytes (using Ca2+ and H+ as counterions) demonstrated better water/moisture stability and thermomechanical properties. In contrast, the filaments formed from organic non-solvents (with Na+ as counterions) showed high moisture sorption and low hornification when subjected to cycles of high and low humidity (dynamic vapor sorption experiments) and swelled extensively upon immersion in water. Our observations highlight the critical role of counter-ions and non-solvents in filament formation and performance. Some of the fundamental aspects are further revealed by using quartz crystal microgravimetry with model films of nanocelluloses subjected to the respective solvent exchange.

2018 ◽  
Vol 166 (5) ◽  
pp. H3035-H3039 ◽  
Hyung-Woo Jee ◽  
Ki-Jung Paeng ◽  
Yongkeun Son ◽  
Yunhyeok Jang ◽  
Kongshik Rho ◽  

2017 ◽  
Vol 164 (13) ◽  
pp. D861-D866 ◽  
Hyung-Woo Jee ◽  
Ki-Jung Paeng ◽  
Noseung Myung ◽  
Krishnan Rajeshwar

2015 ◽  
Vol 112 (11) ◽  
pp. 2256-2266 ◽  
Katherine A. Pfeiffer ◽  
Hagit Sorek ◽  
Christine M. Roche ◽  
Kathryn L. Strobel ◽  
Harvey W. Blanch ◽  

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