Electrophoretic Mobility of Latex Particles Covered with Temperature-Sensitive Hydrogel Layers

Ohshima, Hiroyuki; Makino, Kimiko; Kato, Takayuki; Fujimoto, Keiji; Kondo, Tamotsu; Kawaguchi, Haruma

doi:10.1006/jcis.1993.1356

Cited by 135 publications

(101 citation statements)

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“…The effect of the double-layer compression (which commonly occurs in the 1 mm to 0.1 m range) is intensified by the ionic strength of the medium, and thus, progressively heavier salt concentrations usually involve the asymptotical approach of m e to zero. This tendency, typical of hard-sphere systems, is also predicted by Ohshima's theory [36,37] for soft polyelectrolyte structures. Hence, our experimental results suggest that a nonelectrostatic interaction occurs between ions and surfaces.…”

Section: The Effect Of the Electrolyte Concentration On Electrokinetisupporting

confidence: 76%

Hofmeister Effects on Poly(NIPAM) Microgel Particles: Macroscopic Evidence of Ion Adsorption and Changes in Water Structure

et al. 2006

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The term Hofmeister effects is broadly used to refer to ionic specificities in many different physical, chemical and biological phenomena. The origin of this ionic specificity is sought in two interdependent microscopic sources: 1) the peculiarities of the solvent structure near surfaces and around the ions, and 2) specific ion adsorption-exclusion mechanisms near a surface. In this work, Hofmeister effects on poly(N-isopropylacrylamide) [poly(NIPAM)]-based microgels are examined. Poly(NIPAM) particles are thermally sensitive microgels exhibiting volume-phase transitions with temperature. This temperature-sensitive system seems to be suitable for the independent observation of the two microscopic sources of Hofmeister effects. On the one hand, volume-phase transition, evaluated by photon correlation spectroscopy (PCS), gives information about how the presence of ions changes the water structure around the poly(NIPAM) chains. On the other hand, electrokinetic studies show relevant data about ionic adsorption-exclusion phenomena at the polymer surface.

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Section: The Effect Of the Electrolyte Concentration On Electrokinetisupporting

confidence: 76%

Hofmeister Effects on Poly(NIPAM) Microgel Particles: Macroscopic Evidence of Ion Adsorption and Changes in Water Structure

et al. 2006

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“…[68,69] In addition to these properties, microgels have other characteristics of colloidal dispersions, such as zeta potentials, [69][70][71] and can also form ordered colloidal phases. [72][73][74][75] Some very important studies have focused on the differences between macro-and microgels with respect to their phase behavior.…”

Section: Microgels and Nanogelsmentioning

confidence: 99%

Soft Nanotechnology with Soft Nanoparticles

2005

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The last decade of research in the physical sciences has seen a dramatic increase in the study of nanoscale materials. Today, "nanoscience" has emerged as a multidisciplinary effort, wherein obtaining a fundamental understanding of the optical, electrical, magnetic, and mechanical properties of nanostructures promises to deliver the next generation of functional materials for a wide range of applications. While this range of efforts is extremely broad, much of the work has focused on "hard" materials, such as Buckyballs, carbon nanotubes, metals, semiconductors, and organic or inorganic dielectrics. Meanwhile, the soft materials of current interest typically include conducting or emissive polymers for "plastic electronics" applications. Despite the continued interest in these established areas of nanoscience, new classes of soft nanomaterials are being developed from more traditional polymeric constructs. Specifically, nanostructured hydrogels are emerging as a promising group of materials for multiple biotechnology applications as the need for advanced materials in the post-genomic era grows. This review will present some of the recent advances in the marriage between water-swellable networks and nanoscience.

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“…The electrophoretic mobility of the latex particles was measured in an electrolyte solution as a function of the ionic strength and temperature of the suspending media [15,16]. The latex particles were dispersed in phosphate buffer solutions (pH 7.4) having different ionic strengths at four different temperatures: 25, 30, 35 and 40…”

Section: Electrophoretic Mobility Of Latex Particles Covered With Temmentioning

confidence: 99%

Soft particle analysis of electrokinetics of biological cells and their model systems

Makino

Ohshima

2011

Science and Technology of Advanced Materials

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In this article, we review the applications of a novel theory (Ohshima 2009 Sci. Technol. Adv. Mater. 10 063001) to the analysis of electrokinetic data for various soft particles, that is, particles covered with an ion-permeable surface layer of polyelectrolytes. Soft particles discussed in this review include various biological cells and hydrogel-coated particles as a model of biological cells. Cellular transformations increase the concentration of sialic acid of glycoproteins and are associated with blocked biosynthesis of glycolipids and aberrant expression of the developmentally programmed biosynthetic pathway. The change in shape or biological function of cells may affect their surface properties and can be detected by electrokinetic measurements. The experimental results were analyzed with Ohshima's electrokinetic formula for soft particles and soft surfaces. As a model system, hydrogel surfaces that mimic biological surfaces were also prepared and their surface properties were studied.

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Electrophoretic Mobility of Latex Particles Covered with Temperature-Sensitive Hydrogel Layers

Cited by 135 publications

References 0 publications

Hofmeister Effects on Poly(NIPAM) Microgel Particles: Macroscopic Evidence of Ion Adsorption and Changes in Water Structure

Hofmeister Effects on Poly(NIPAM) Microgel Particles: Macroscopic Evidence of Ion Adsorption and Changes in Water Structure

Soft Nanotechnology with Soft Nanoparticles

Soft particle analysis of electrokinetics of biological cells and their model systems

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