Periodic Swelling and Collapse of Polyelectrolyte Brushes Driven by Chemical Oscillation

Zhang, Guangzhao

doi:10.1021/jp801533r

Cited by 47 publications

(50 citation statements)

References 32 publications

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“…One can also mention that poly(sodium acrylate) was synthesized by ATRP from the surface modified by 11-mercaptoundecyl bromoisobutyrate. 21 Formation of the initiator layer and the polymer layer was proved by XPS. The authors determined the thickness of the layer and the distance between two binding sites and found that the former is much higher than the latter; this means that polymer is attached to the surface in the "brush" regime.…”

Section: Introductionmentioning

confidence: 99%

pH- and Electro-Responsive Properties of Poly(acrylic acid) and Poly(acrylic acid)-block-poly(acrylic acid-grad-styrene) Brushes Studied by Quartz Crystal Microbalance with Dissipation Monitoring

et al. 2015

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We report on the synthesis of novel pH- and electro-responsive polyelectrolyte brushes from a gold substrate by direct one-step nitroxide-mediated polymerization of acrylic acid (AA) or copolymerization of AA and styrene (S). In the latter case, amphiphilic brushes of block-gradient copolymers PAA-b-(PAA-grad-PS) comprising one PAA block and one block with the gradient sequence of AA and S were obtained. The block-gradient copolymers are initiated from the surface by the start of the PAA block. The brushes were characterized by XPS and ellipsometry. (1)H NMR confirmed the gradient sequence of the PAA-grad-PS copolymer block. The pH- and electro-responsive properties of the brushes were studied by quartz crystal microbalance with dissipation monitoring (QCM-D) in combination with electrochemistry. This method provides evidence of swelling of the PAA brushes proportional to the contour length of the chains at elevated pH, whereas the response functions of the block-gradient copolymers are more complex and point to intermolecular aggregation in the brush at low pH. Monitoring of the changes in resonance frequency and dissipation of the QCM-D also demonstrates that application of negative voltage to the substrate leads to swelling of the brush; application of a positive voltage provokes only a transient collapse of the brush in proportion to the applied voltage.

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Section: Introductionmentioning

confidence: 99%

pH- and Electro-Responsive Properties of Poly(acrylic acid) and Poly(acrylic acid)-block-poly(acrylic acid-grad-styrene) Brushes Studied by Quartz Crystal Microbalance with Dissipation Monitoring

et al. 2015

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“…E dissipated is the energy dissipated during one oscillation, and E stored is the energy stored in the oscillating system [41]. As shown in Figure 10A, ΔD undergoes the self-oscillation in synchronization with the Δf self-oscillation.…”

Section: Direct Observation Of the Autonomous Oscillation Of The Singmentioning

confidence: 99%

Function and Autonomous Behavior of Self-Oscillating Polymer Systems

Hara

2014

Polymers

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A novel gel undergoes the Belousov-Zhabotinsky (BZ) reaction in strong-acid-free conditions. Under such conditions, the gel can switch the BZ reaction on or off in conventional self-oscillating gels that undergo self-oscillation only in aqueous solutions with strong acids, such as HNO 3 or H 2 SO 4 . The self-oscillation of the polymer chain can be controlled by varying the temperature, owing to its thermoresponsive property. Moreover, the polymer chain undergoes viscosity self-oscillations in strong-acid-free conditions. In this review, the direct observation of self-oscillations in polymer chains attached to glass or gold surfaces, by using scanning probe microscopy and quartz crystal microbalances with dissipation monitoring, is discussed.

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“…Briefly, when the surface of a sensor crystal adsorbs (soft) matter, changes in its resonance frequency (f) related to the mass attached (including coupled water), and in its dissipation (D) related to frictional (viscous) losses in the adlayer, are measured with a time resolution of better than 1 s. In air or vacuum, if the added layer is rigid, and much thinner than the crystal, the frequency shift (f) is related to mass loaded (m) and the overtone number (n = 1, 3, 5, ...) by the Sauerbrey equation [29],…”

Section: Qcm-d Measurementsmentioning

confidence: 99%

Self-assembly of anisotropic tobacco mosaic virus nanoparticles on gold substrate

et al. 2011

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A facile approach to assembled virus film with tunable structure is presented. Rod-like tobacco mosaic virus (TMV) was selected as the prototype in this study for its anisotropic structural feature. TMV can either "lie down" or "stand up" on gold substrate by tuning the solution pH. A quartz crystal microbalance with dissipation monitoring was used to monitor the pH-dependent self-assembly behavior of TMV nanoparticles, and atomic force microscopy and single molecule force spectroscopy further confirmed the different assembly structures. tobacco mosaic virus, self-assembly, quartz crystal microbalance with dissipation, single molecule force spectroscopy

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Periodic Swelling and Collapse of Polyelectrolyte Brushes Driven by Chemical Oscillation

Cited by 47 publications

References 32 publications

pH- and Electro-Responsive Properties of Poly(acrylic acid) and Poly(acrylic acid)-block-poly(acrylic acid-grad-styrene) Brushes Studied by Quartz Crystal Microbalance with Dissipation Monitoring

pH- and Electro-Responsive Properties of Poly(acrylic acid) and Poly(acrylic acid)-block-poly(acrylic acid-grad-styrene) Brushes Studied by Quartz Crystal Microbalance with Dissipation Monitoring

Function and Autonomous Behavior of Self-Oscillating Polymer Systems

Self-assembly of anisotropic tobacco mosaic virus nanoparticles on gold substrate

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