scholarly journals Hysteretic Swelling/Deswelling of Polyelectrolyte Brushes and Bilayer Films in Response to Changes in pH and Salt Concentration

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 812
Author(s):  
Nisha Hollingsworth ◽  
Ronald G. Larson
Keyword(s):  
Acrylic Acid ◽  
Quartz Crystal Microbalance ◽  
Salt Concentration ◽  
Quartz Crystal ◽  
Ethylene Imine ◽  
Polyelectrolyte Brushes ◽  
Bilayer Films ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

Abstract We use a quartz crystal microbalance with dissipation (QCM-D) to investigate the swelling/de-swelling and hysteresis in brushes of weakly ionizable polyanion poly(acrylic acid) (PAA) brushes and bilayers containing a PAA brush and a poly(ethylene imine) (PEI) overlayer [...]

scholarly journals Molecular Dynamics Simulation to Understand the Ability of Anionic Polymers to Alter the Morphology of Calcite

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Insil Choi ◽  
Il Won Kim
Keyword(s):  
Molecular Dynamics ◽  
Acrylic Acid ◽  
Methacrylic Acid ◽  
Dynamics Simulation ◽  
Magnesium Ions ◽  
Ethylene Imine ◽  
Anionic Polymers ◽  
Binding Behavior ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

Molecular dynamics was utilized to investigate the ability of anionic macromolecules to drastically change the morphology of calcite in the presence of magnesium ions. Anionic poly(acrylic acid) and poly(methacrylic acid) were compared with cationic poly(ethylene imine) in their binding behavior on calcite (104) and (110) surfaces. Poly(acrylic acid) and poly(methacrylic acid) showed preferential binding on (110) with strong electrostatic attractions, whereas poly(ethylene imine) was only weakly attracted to (104). The extent of the charge imbalance on the surfaces appeared responsible for the current results, which originated from the deficient number of the coordinating oxygen atoms of carbonate around the surface calcium. The results of the current study were in accordance with the previous experimental observations, where the {hk0} surfaces of calcite were elongated under the coexistence of the anionic polymers and magnesium ions. These results could be generally utilized in the polymer-controlled crystallization with broad implications in the specific interactions with crystal surfaces.

Response of Swelling Behavior of Weak Branched Poly(ethylene imine)/Poly(acrylic acid) Polyelectrolyte Multilayers to Thermal Treatment

Langmuir ◽  
2016 ◽  
Vol 32 (24) ◽  
pp. 6020-6027 ◽  
Author(s):  
Yuanqing Gu ◽  
Emily K. Weinheimer ◽  
Xiang Ji ◽  
Clinton G. Wiener ◽  
Nicole S. Zacharia
Keyword(s):  
Thermal Treatment ◽  
Acrylic Acid ◽  
Swelling Behavior ◽  
Polyelectrolyte Multilayers ◽  
Ethylene Imine ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

scholarly journals Signal enhancement in ligand–receptor interactions using dynamic polymers at quartz crystal microbalance sensors

The Analyst ◽  
2016 ◽  
Vol 141 (13) ◽  
pp. 3993-3996 ◽  
Author(s):  
Gunnar Dunér ◽  
Henrik Anderson ◽  
Zhichao Pei ◽  
Björn Ingemarsson ◽  
Teodor Aastrup ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Signal Enhancement ◽  
Interaction Studies ◽  
Receptor Interactions ◽  
Poly Acrylic Acid

The signal enhancement properties of QCM sensors based on dynamic, biotinylated poly(acrylic acid) brushes has been studied in interaction studies with an anti-biotin Fab fragment.

Nanoassembled Thin Film Gas Sensors. III. Sensitive Detection of Amine Odors Using TiO2/Poly(acrylic acid) Ultrathin Film Quartz Crystal Microbalance Sensors

2010 ◽  
Vol 82 (6) ◽  
pp. 2228-2236 ◽  
Author(s):  
Seung-Woo Lee ◽  
Naoki Takahara ◽  
Sergiy Korposh ◽  
Do-Hyeon Yang ◽  
Kiyoshi Toko ◽  
...  
Keyword(s):  
Thin Film ◽  
Acrylic Acid ◽  
Quartz Crystal Microbalance ◽  
Gas Sensors ◽  
Quartz Crystal ◽  
Ultrathin Film ◽  
Sensitive Detection ◽  
Poly Acrylic Acid

scholarly journals The Combined Effects of Sr(II) and Poly(Acrylic Acid) on the Morphology of Calcite

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3339 ◽  
Author(s):  
Hak Yeong Kim ◽  
Taewook Yang ◽  
Wansoo Huh ◽  
Young-Je Kwark ◽  
Yunsang Lee ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Combined Effects ◽  
Magnesium Ions ◽  
Ethylene Imine ◽  
Strontium Ions ◽  
Poly Ethylene ◽  
Poly Acrylic Acid

Biomineralization of calcium carbonate has interesting characteristics of intricate morphology formation with controlled crystal polymorphs. In particular, modification of calcite morphology with diverse additives has been the focus of many biomimetic and bioinspired studies. The possible role of strontium ions in enhancing the morphology-modifying ability of macromolecules was investigated. In the present study, concentrations of strontium ions were comparable to that in seawater, and anionic poly(acrylic acid) and cationic poly(ethylene imine) were used as model macromolecules. When strontium ions were combined with anionic poly(acrylic acid), new types of calcite surfaces, most likely {hk0}, appeared to drastically change the morphology of the crystals, which was not observed with cationic poly(ethylene imine). This behavior of strontium ions was quite similar to that of magnesium ions, which is intriguing because both ions are available from seawater to be utilized during biomineralization.

scholarly journals Interaction of Proteins with a Planar Poly(acrylic acid) Brush: Analysis by Quartz Crystal Microbalance with Dissipation Monitoring (QCM-D)

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 122
Author(s):  
Jacek Walkowiak ◽  
Michael Gradzielski ◽  
Stefan Zauscher ◽  
Matthias Ballauff
Keyword(s):  
Acrylic Acid ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Water Contact ◽  
Strong Adsorption ◽  
Ft Ir ◽  
Calorimetric Studies ◽  
Adsorption Desorption ◽  
Contact Angle Analysis ◽  
Poly Acrylic Acid

We describe the preparation of a poly(acrylic acid) (PAA) brush, polymerized by atom transfer radical polymerization (ATRP) of tert-butyl acrylate (tBA) and subsequent acid hydrolysis, on the flat gold surfaces of quartz-crystal microbalance (QCM) crystals. The PAA brushes were characterized by Fourier transform infrared (FT-IR) spectroscopy, ellipsometry and water contact angle analysis. The interaction of the PAA brushes with human serum albumin (HSA) was studied for a range of ionic strengths and pH conditions by quartz-crystal microbalance with dissipation monitoring (QCM-D). The quantitative analysis showed a strong adsorption of protein molecules onto the PAA brush. By increasing the ionic strength, we were able to release a fraction of the initially bound HSA molecules. This finding highlights the importance of counterions in the polyelectrolyte-mediated protein adsorption/desorption. A comparison with recent calorimetric studies related to the binding of HSA to polyelectrolytes allowed us to fully analyze the QCM data based on the results of the thermodynamic analysis of the binding process.

Salt- and pH-induced swelling of a poly(acrylic acid) brush via quartz crystal microbalance w/dissipation (QCM-D)

Soft Matter ◽  
2019 ◽  
Vol 15 (39) ◽  
pp. 7838-7851 ◽  
Author(s):  
Nisha R. Hollingsworth ◽  
Sabina I. Wilkanowicz ◽  
Ronald G. Larson
Keyword(s):  
Acrylic Acid ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Swelling Behavior ◽  
Poly Acrylic Acid

Poly(arylic acid) brushes are thoroughly investigated using QCM-D to elucidate their swelling behavior in the presence of salt.

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