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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

682
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Electrostatic Boundary Conditions in Dielectrics01:27

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Dielectric Polarization in a Capacitor01:31

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Tailoring Dielectric Surface Charge via Atomic Layer Thickness.

Tomoki Hayashida1, Kazumichi Yokota1, Sanae Murayama1

  • 1The Institute of Scientific and Industrial Research , Osaka University , Ibaraki , Osaka 567-0047 , Japan.

ACS Applied Materials & Interfaces
|January 1, 2020
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Summary
This summary is machine-generated.

Atomically thin dielectric coatings precisely tune solid-state nanopore surface potential. This method enhances particle capture and translocation speed, offering broad applications for sensors in aqueous media.

Keywords:
Debye lengthatomic layer depositionelectroosmosisnanoporesurface chargezeta potential

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Solid-state nanopore surface properties critically influence single-particle dynamics.
  • Tuning surface potential is key for optimizing nanopore-based sensing and separation.

Purpose of the Study:

  • To demonstrate precise control over nanopore surface potential using atomically thin dielectric coatings.
  • To investigate the impact of surface modification on particle capture and translocation dynamics.

Main Methods:

  • Atomic layer deposition of alumina (Al2O3) on silicon nitride (Si3N4) micropores.
  • Measurement of surface zeta-potential in aqueous buffer solutions.
  • Analysis of capture rate and translocation speed of negatively charged polymeric particles.

Main Results:

  • A 1 nm alumina coating significantly reduced surface zeta-potential, acting as a water-permeable layer.
  • Zeta-potential was tunable with a resolution of 3.4 mV/nm by increasing dielectric thickness.
  • Functionalized pores showed enhanced particle capture rates and translocation speeds due to reduced electroosmotic back flow.

Conclusions:

  • Atomically thin dielectric coatings offer a versatile method for fine-tuning nanopore surface charge.
  • This approach improves particle handling in nanopore devices.
  • The technique is broadly applicable to various sensors and devices operating in aqueous environments.