Study on the kinetics of adsorption of poly(ethylene oxide) onto a silica particle using optical tweezers and microfluidics

Geonzon, Lester C.; Kobayashi, Motoyoshi; Sugimoto, Takashige; Adachi, Yasuhisa

doi:10.1016/j.colsurfa.2022.128691

Cited by 11 publications

(13 citation statements)

References 64 publications

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“…The attraction between particles and polymer can be interpreted as an increase of the effective hydrodynamic radius . In fact, a larger thickness of the adsorbed polymer is reported in ref when particles and polymer have opposite charges. This implies that at higher polymer concentration we have larger particles and thus smaller diffusion coefficients than expected for bare particles.…”

Section: Resultsmentioning

confidence: 86%

“…It also depends on the size and geometry of the particles (eq ). Note that the size may increase by the adsorption of the PEO coils, and this effect has been reported and used for controlling the stability of colloids. − Such a soft layer can grow up to tens of nanometers, even for particles with negative surface charge. Hence, its effect on the rotational diffusion coefficient cannot be ruled out.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, its effect on the rotational diffusion coefficient cannot be ruled out. However, for PEO concentrations larger than 0.002% w/w, 71 the thickness does not increase with polymer concentration, this indicating that the layer is saturated, and hence, the ratio Θ 0 /Θ (where Θ and Θ 0 are the rotational diffusion coefficients in the polymer solution and in the most diluted one, respectively) is expected to be independent of the size of the particles. This quantity is represented in Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

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Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions

et al. 2023

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Brownian diffusion of spherical nanoparticles is usually exploited to ascertain the rheological properties of complex media. However, the behavior of the tracer particles is affected by a number of phenomena linked to the interplay between the dynamics of the particles and polymer coils. For this reason, the characteristic lengths of the dispersed entities, depletion phenomena, and the presence of sticking conditions have been observed to affect the translational diffusion of the probes. On the other hand, the retardation effect of the host fluid on the rotational diffusion of nonspherical particles is less understood. We explore the possibility of studying this phenomenon by analyzing the electro-orientation of the particles in different scenarios in which we vary the ratio between the particle and polymer characteristic size, and the geometry of the particles, including both elongated and oblate shapes. We find that the Stokes–Einstein relation only applies if the radius of gyration of the polymer is much shorter than the particle size and when some repulsive interaction between both is present.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions

et al. 2023

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“…Van Heiningen and Hill, for example, have studied the adsorption of poly(ethylene oxide) (PEO) onto trapped silica particles by means of electrophoretic mobility measurements [42]. Furthermore, Geonzon et al have evaluated the hydrodynamic layer thickness of the same system (i.e., PEO and silica particles) by measuring the balance between the trapping force and the hydrodynamic force that the particle experienced under a controlled fluid flow [43]. But overall, the literature on polymer adsorption onto colloids at single-particle level is rather limited.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Geonzon et al. have evaluated the hydrodynamic layer thickness of the same system (i.e., PEO and silica particles) by measuring the balance between the trapping force and the hydrodynamic force that the particle experienced under a controlled fluid flow [43]. But overall, the literature on polymer adsorption onto colloids at single‐particle level is rather limited.…”

Section: Introductionmentioning

confidence: 99%

Single‐particle electrophoresis for studying the adsorption of cationic polymers onto anionic particles

et al. 2022

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Understanding the adsorption of polymers onto particles is crucial for many technological and biomedical applications. Even though polymer adsorption on particles is a dynamic process, most experimental techniques can only study the adsorption indirectly, in equilibrium and on the ensemble level. New analysis methods are required to overcome these limitations. We investigated the use of single-particle electrophoresis to study the adsorption kinetics of cationic polymers onto anionic particles and compared the resulting data to a theoretical model. In this approach, the electrophoretic mobility of single polystyrene (PS) particles, exposed to different concentrations of poly(2-guanidinoethyl methacrylate), was measured as a function of time. The polymer adsorption leads to an electrophoretic mobility change of the PS particle over time, from the initial negative value to a positive value at equilibrium. By fitting the kinetics data to the Langmuir model, the adsorption rate, desorption rate and equilibrium constant were determined. Finally, the adsorption kinetics of several other polymers was investigated. This showed that the presented technique enables direct analysis and comparison of the kinetics of polymer adsorption on the single-particle level.

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Micro‐Acoustic Holograms for Detachable Microfluidic Devices

Xu,

Vidler,

Wang

et al. 2024

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Acoustic microfluidic devices have advantages for diagnostic applications, therapeutic solutions, and fundamental research due to their contactless operation, simple design, and biocompatibility. However, most acoustofluidic approaches are limited to forming simple and fixed acoustic patterns, or have limited resolution. In this study,a detachable microfluidic device is demonstrated employing miniature acoustic holograms to create reconfigurable, flexible, and high‐resolution acoustic fields in microfluidic channels, where the introduction of a solid coupling layer makes these holograms easy to fabricate and integrate. The application of this method to generate flexible acoustic fields, including shapes, characters, and arbitrarily rotated patterns, within microfluidic channels, is demonstrated.

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Study on the kinetics of adsorption of poly(ethylene oxide) onto a silica particle using optical tweezers and microfluidics

Cited by 11 publications

References 64 publications

Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions

Electro-optical Study of the Anomalous Rotational Diffusion in Polymer Solutions

Single‐particle electrophoresis for studying the adsorption of cationic polymers onto anionic particles

Micro‐Acoustic Holograms for Detachable Microfluidic Devices

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