Electromagnetophoretic Measurements of Adsorption Forces of Polystyrene Microparticles on Silica Surfaces in Surfactant Solutions

Iiguni, Yoshinori; Watarai, Hitoshi

doi:10.1246/bcsj.79.47

Cited by 14 publications

(11 citation statements)

References 28 publications

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“…6,7 In the present study, we focused on the oligosaccharide-protein interaction, which plays a key role in cellular recognition. 8,9 Concanavalin A (Con A) is a well characterized lectin, which has oligosaccharide-binding proteins.…”

mentioning

confidence: 99%

Electromagnetophoretic Force Measurement of a Single Binding Interaction between Lectin and Yeast Cell Surfaces

Iiguni

Watarai

2007

ANAL. SCI.

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confidence: 99%

Electromagnetophoretic Force Measurement of a Single Binding Interaction between Lectin and Yeast Cell Surfaces

Iiguni

Watarai

2007

ANAL. SCI.

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“…100 μN/m for 15 μm diameter polystyrene particles and adsorption forces of ca. 80 μN/m for 20 μm diameter polystyrene particles [67]. The authors concluded that the adsorption force was mainly governed by Van der Waals forces [68,69].…”

Section: Revision Of Traditional Approaches For Rplc Mechanismmentioning

confidence: 99%

Reverse-High Performance Liquid Chromatography Mechanism Explained by Polarization of Stationary Phase

Andrade-Eiroa¹

2011

CheM

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Original results and conclusions on Reverse Phase High Performance Liquid Chromatography (RPLC) mechanism are here presented. So far, none of the theoretical approaches applied to the RPLC mechanism can explain the retention and elution mechanisms of most of the analytes by RPLC, especially neutral organic compounds. Our experiences allowed us to state that RPLC retention mechanism most likely occurs through polarization of stationary phase (usually dielectric surfaces) submerged into solvents with huge dielectric constant and high dipole moment (i.e. water and/or acetonitrile) at high pressures as those applied in RPLC systems. The surface polarized interacts with polarizable target analytes (i.e. naphthalene, pyrene or benzo(ghi)perylene) in such a way that the retention depends on the medium polarizability of the target compound. The higher is the medium polarizability of the compound retained the higher is its retention time.By using Polycyclic Aromatic Hydro-carbons (PAHs) and 6-nitrochrysene as probes, we found that although the dependence of retention times on pressure is not evident in most cases, the interaction between pressure and the mobile phase dipole moment is evidenced at the light of the constructed mathematical models. Two very different cases can be distinguished:1. On one hand, when low dipole moment mobile phases are used, high pressure means big work developed by the system in such a way that high pressures inside the system reduce retention times compared to low pressures.2. On the another one, when high dipole moment solvents are used as mobile phase, high pressure entails an outstanding increase of the retention times compared to low dipole moment mobile phases. This is most likely due to high pressures that entail closer alignment of mobile phase dipoles and lesser tilt of them, originating an outstanding electric field inside the analytical column.In addition to this, reduced retention times for dipole solutes (6-nitrochrysene, dipole molecule) compared to non-polar solutes (PAHs) were observed when pressure drops. This conclusions would allow to extend the model to basic/acid molecules at different pH. In this case, electrostatic repulsions among analyte molecules should be considered.

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“…[4][5][6] Furthermore, an electromagnetophoretic force was applied to dynamic force measurements of chemical interactions between a particle and a capillary wall and a dynamic force analysis of the breaking of interactions between a yeast cell and lectin on the wall of a capillary. [7][8][9][10] The advantages of using an electromagnetophoretic force for the separation of particles and the dynamic force measurement are that: (i) a non-contact migration of particles is possible, (ii) an open solution system is acceptable, and (iii) the separation force is easily controllable by an electric current. Usually, the electromagnetophoretic (EMP) force, FEMP, is represented by a simplified equation assuming a uniform electric current and a uniform magnetic field that are perpendicularly applied on a particle in an electrolyte solution, …”

Section: Introductionmentioning

confidence: 99%

Electromagnetophoretic Micro-convection around a Droplet in a Capillary

2017

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The electromagnetophoretic behavior of organic droplets in an electrolyte solution was investigated in a silica capillary cell using a superconducting bulk magnet (3.5 T) and a magnetic circuit (2.7 T). The initially dispersed emulsion droplets of dodecane migrated to the wall of the capillary, responding to the direction of an electric current, and coalesced to form smaller and larger droplets after some repeated migrations. When the electric current was applied continuously, the larger droplets became arranged with regular intervals on the wall, and smaller droplets rotated around the larger droplets. These interesting behaviors were analyzed while taking into account the local electric current density determined by the flow velocity of the ionic current around a droplet, which was lowest on the electrode sides of the droplet. The difference in the local electric current density generated the Lorentz-force difference in the medium, which lead to local microconvection around the droplet, and also the alignment of larger droplets by a repelling effect between the adjacent microconvections.

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Electromagnetophoretic Measurements of Adsorption Forces of Polystyrene Microparticles on Silica Surfaces in Surfactant Solutions

Cited by 14 publications

References 28 publications

Electromagnetophoretic Force Measurement of a Single Binding Interaction between Lectin and Yeast Cell Surfaces

Electromagnetophoretic Force Measurement of a Single Binding Interaction between Lectin and Yeast Cell Surfaces

Reverse-High Performance Liquid Chromatography Mechanism Explained by Polarization of Stationary Phase

Electromagnetophoretic Micro-convection around a Droplet in a Capillary

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