基礎講座 電気泳動(Electrophoresis)

The development of novel materials is a fundamental focal point of chemical research; and this interest is mandated by advancements in all areas of industry and technology. A good example of the synergism between scientific discovery and technological development is the electronics industry, where discoveries of new semiconducting materials resulted in the evolution from vacuum tubes to diodes and transistors, and eventually to miniature chips. The progression of this technology led to the development * To whom correspondence should be addressed. B.L.C.: (504) 2801385 (phone); (504) 280-3185 (fax); bcushing@uno.edu (e-mail). C.J.O.: (504)280-6846(phone);(504)280-3185(fax);coconnor@uno.edu (e-mail). 3893 Chem. Rev. 2004, 104, 3893−3946

http://depa.fquim.unam.mx/amyd//archivero/FidelmarLechugaSanabria_4940.pdf

Recent advances in the liquid-phase syntheses of inorganic nanoparticles.

1: Magnetic Particles: Preparation, Properties and Applications: M. Ozaki. 2: Maghemite (gamma-Fe2O3): A Versatile Magnetic Colloidal Material C.J. Serna, M.P. Morales. 3: Dynamics of Adsorption and Oxidation of Organic Molecules on Illuminated Titanium Dioxide Particles Immersed in Water M.A. Blesa, R.J. Candal, S.A. Bilmes. 4: Colloidal Aggregation in Two-Dimensions A. Moncho-Jorda, F. Martinez-Lopez, M.A. Cabrerizo-Vilchez, R. Hidalgo Alvarez, M. Quesada-PMerez. 5: Kinetics of Particle and Protein Adsorption Z. Adamczyk.

Surface and Colloid Science

This chapter introduces the finite element method (FEM) as a tool for solution of classical electromagnetic problems. Although we discuss the main points in the application of the finite element method to electromagnetic design, including formulation and implementation, those who seek deeper understanding of the finite element method should consult some of the works listed in the bibliography section.

Introduction to the Finite Element Method

Applied Numerical Analysis. By C.F. Gerald. Pp. xii, 340. £3·60. 1970. (Addison-Wesley.)

Approximate Analytical Expression for Surface-Potential as a Function of Surface-Charge Density

Electrophoresis of a charge-regulated sphere at an arbitrary position in a charged spherical cavity.

Dynamic electrophoresis is a powerful analytical tool for the description of the surface properties of the charged entities in a concentrated dispersion. In our study the boundary effect on this dynamic phenomenon is investigated theoretically for the case, when the surface potential is low. In particular, the dynamic electrophoresis of a sphere in a spherical cavity is discussed as are the effects of the key factors on the phenomenon under consideration, which include the thickness of the double layer, the frequency of the applied electric field, the ratio of particle radius to cavity radius, and the boundary conditions of the surfaces of the particle and the cavity. The results of numerical simulation reveal that these key factors can have both quantitative and qualitative influence on the electrophoretic behavior of the particle. As an example, for the case of a positively charged particle placed in a negatively charged cavity if the double layer surrounding the particle is thin, the magnitude of the electrophoretic mobility of the particle increases with an increase in the frequency of the applied electric field and a phase lead may occur, but the opposite is true if the double layer is thick. These effects are not observed for the case of a positively charged particle placed in an uncharged cavity or for a positively charged particle placed in a positively charged cavity.

http://ntur.lib.ntu.edu.tw/bitstream/246246/87549/1/14.pdf

Dynamic electrophoretic mobility of a sphere in a spherical cavity

The potential applications of biomimetic artificial nanopores in versatile fields capture much attention in the past few decades. Although it is known that applying simultaneously an electric potential and a pH gradient can improve appreciably the performance of the ion current rectification of a nanopore, the underlying mechanisms are still not understood comprehensively. Adopting a cylindrical nanopore functionalized with homogeneous (single) pH-tunable polyelectrolyte brushes, these mechanisms are discussed in this study. In particular, the roles that the applied pH, electric potential gradients, and the grafting density of the polyelectrolyte chains played are examined in detail. We show that homogeneously modified nanopores can also exhibit ion current rectification behavior that is only seen in nanopores functionalized with two or more kinds of polyelectrolytes. Several interesting results are also observed. For example, if the applied pH gradient is sufficiently strong, the preferential direction of the ionic current can be tuned by the level of the applied electric potential; if it is sufficiently weak, an increase in the grafting density of the polyelectrolyte chains can make that preferential direction reversed. These results provide not only explanation for the behaviors associated with the transport of ions in nanopores but also a reference for designing relevant devices.

Dual pH Gradient and Voltage Modulation of Ion Transport and Current Rectification in Biomimetic Nanopores Functionalized with a pH-Tunable Polyelectrolyte

Jyh-Ping Hsu

Papers

Approximate Analytical Expression for Surface-Potential as a Function of Surface-Charge Density

Electrophoresis of a charge-regulated sphere at an arbitrary position in a charged spherical cavity.

Dynamic electrophoretic mobility of a sphere in a spherical cavity

Dual pH Gradient and Voltage Modulation of Ion Transport and Current Rectification in Biomimetic Nanopores Functionalized with a pH-Tunable Polyelectrolyte

Effect of cell membrane structure of human erythrocyte on its electrophoresis