A fundamental study of adsorption kinetics of surfactants onto metal oxides using quartz crystal microbalance with dissipation (QCM-D)

Medina, Sandra Constanza; Farinha, Andreia S.F.; Emwas, Abdul‐Hamid; Tabatabai, A.; Leiknes, TorOve

doi:10.1016/j.colsurfa.2019.124237

Cited by 25 publications

(7 citation statements)

References 35 publications

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“…During this process, a change of 181.9 Hz is seen in f. This can be correlated to mass deposition based on Sauerbrey model (Cougnon, Gautier, Pilard, Casse, & Chénais, 2008) or Voigh viscoelastic model (Medina et al, 2020). The results reveal an increase in thickness at the surface due to greater assembly of macromolecules, obviously due to complex formation between PA and DNA.…”

Section: Resultsmentioning

confidence: 78%

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DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH

Bibi,

Shah

2023

Acta Sci Technol

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The pH dependence of heparin and dextran sulfate aided release of DNA from its polyplexes with polyaziridine (PA) has been investigated using Quartz crystal microbalance with dissipation monitoring (QCM-D). The acoustic behavior of ternary systems indicated that the DNA decondensation was favored at physiological pH. When pH < 7.4, PA was significantly positively charged and ternary complexation occurred. When pH exceeded 7.4, very small proportion of DNA was released upon heparin addition due to marked reduction in cationic nature of PA. An increase in thickness at the interface due to adsorbed material at pH 9.0 showed the retention of heparin on the surface despite of negligible release of DNA. In terms of PA binding, heparin proved to be a better competitor than dextran sulfate.

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Section: Resultsmentioning

confidence: 78%

“…A concurrent increase in dissipation (from a to b) observed in our case reflects the existence of loosely bound macromolecules at the solid-liquid interface. The dissipation is altered by a magnitude of  2.0 x10 -6 , based on which it can be inferred that the PA film is not rigid (Medina, Farinha, Emwas, Tabatabai, & Leiknes, 2020).…”

Section: Resultsmentioning

confidence: 99%

DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH

Bibi,

Shah

2023

Acta Sci Technol

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“…Thus, NMR spectroscopy is extensively used in a wide range of applications, including organic chemistry [108], biochemistry, polymer chemistry [122], inorganic chemistry [122], structural biology [52], physics [61,[123][124][125][126][127], biology, and drug discovery [52,128,129]. Through NMR experiments, researchers can study samples in the solid state [130][131][132], gel phase [133][134][135][136], tissue state [137][138][139], gas phase, and solution state [140][141][142][143]; these approaches have been used to investigate molecular structures, concentration levels, and molecular dynamics [144][145][146]. Moreover, the continuous development of NMR experimental methods and NMR machinery, such as dynamic nuclear polarization (DNP) and high-field NMR spectrometers, has continuously enhanced research on the physical and chemical properties of samples [216][217][218].…”

Section: Nmr Spectroscopymentioning

confidence: 99%

Using NMR spectroscopy to investigate the role played by copper in prion diseases

et al. 2020

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Prion diseases are a group of rare neurodegenerative disorders that develop as a result of the conformational conversion of normal prion protein (PrP C) to the disease-associated isoform (PrP Sc). The mechanism that actually causes disease remains unclear. However, the mechanism underlying the conformational transformation of prion protein is partially understood-in particular, there is strong evidence that copper ions play a significant functional role in prion proteins and in their conformational conversion. Various models of the interaction of copper ions with prion proteins have been proposed for the Cu (II)-binding, cell-surface glycoprotein known as prion protein (PrP). Changes in the concentration of copper ions in the brain have been associated with prion diseases and there is strong evidence that copper plays a significant functional role in the conformational conversion of PrP. Nevertheless, because copper ions have been shown to have both a positive and negative effect on prion disease onset, the role played by Cu (II) ions in these diseases remains a topic of debate. Because of the unique properties of paramagnetic Cu (II) ions in the magnetic field, their interactions with PrP can be tracked even at single atom resolution using nuclear magnetic resonance (NMR) spectroscopy. Various NMR approaches have been utilized to study the kinetic, thermodynamic, and structural properties of Cu (II)-PrP interactions. Here, we highlight the different models of copper interactions with PrP with particular focus on studies that use NMR spectroscopy to investigate the role played by copper ions in prion diseases.

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“…21,22) In the field of chemicals, for quantitatively evaluating the adsorption kinetics of various surfactants. 23,24) In the field of high-pressure gas, for leak detection of the combustible gas and the toxic gas. 25,26) Furthermore, in mechanical engineering, for evaluating the adsorption of lubricating oil to the mechanical elements that cause friction.…”

Section: Introductionmentioning

confidence: 99%

Study on micropillar arrangement optimization of wireless-electrodeless quartz crystal microbalance sensor and application to a gas sensor

Kato

Sato

Ato

et al. 2021

Jpn. J. Appl. Phys.

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This paper studies the structural design of the wireless-electrodeless quartz crystal microbalance (QCM) sensor, which has a rectangular AT-cut quartz oscillator installed in the microchannel fabricated by nanoimprint lithography. The quartz oscillator was supported by the micropillars in the microchannel, and by optimizing the micropillar arrangement, it was found that the structural damping could be significantly reduced by performing the finite elemental piezoelectric analysis. This behavior was then confirmed by the experiments using the evaluation chips. By supporting the four corners of the quartz oscillator with the micropillars, the structural damping could be reduced, achieving a high-quality factor (Q-factor) of about 24700. This high Q-factor was also realized in the experiments, and we investigated its application to a hydrogen-gas sensor. We succeeded in detecting hydrogen gas with an extremely low concentration of 10 ppm.

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A fundamental study of adsorption kinetics of surfactants onto metal oxides using quartz crystal microbalance with dissipation (QCM-D)

Cited by 25 publications

References 35 publications

DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH

DNA Release from Polyaziridine Polyplexes Aided by Biomacromolecules: Effect of pH

Using NMR spectroscopy to investigate the role played by copper in prion diseases

Study on micropillar arrangement optimization of wireless-electrodeless quartz crystal microbalance sensor and application to a gas sensor

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