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Related Concept Videos

Insulation Coordination01:23

Insulation Coordination

Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times for...
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Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
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Related Experiment Video

Updated: May 31, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
08:02

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Published on: February 11, 2020

Ripple formation and smoothening on insulating surfaces.

Randall L Headrick1, Hua Zhou

  • 1Department of Physics and Materials Science Program, University of Vermont, Burlington, VT 05405, USA.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|July 1, 2011
PubMed
Summary
This summary is machine-generated.

Ion bombardment of insulating surfaces like Al2O3 and SiO2 creates ordered ripple patterns. New relaxation mechanisms and nonlinear effects explain surface evolution during ion sputtering.

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Area of Science:

  • Surface science
  • Materials science
  • Ion beam analysis

Background:

  • Ion bombardment of insulating surfaces (Al2O3, SiO2) leads to ordered ripple formation.
  • Ripple characteristics depend on ion energy, incidence angle, and substrate temperature.
  • Surface smoothing occurs under specific conditions, like near-normal incidence Ar+ ion bombardment.

Purpose of the Study:

  • To describe the current status of linear theory for ion-bombarded insulating surfaces.
  • To present recent experimental results on surface pattern formation.
  • To explain observed phenomena using extensions of the Bradley-Harper theory.

Main Methods:

  • Theoretical modeling based on extensions of the Bradley-Harper theory.
  • Experimental investigation of ion bombardment effects on Al2O3 and SiO2 surfaces.
  • Analysis of surface morphology evolution under varying ion bombardment parameters.

Main Results:

  • Identification of operative relaxation mechanisms: viscous flow, lateral currents, and surface diffusion.
  • Explanation of most observed phenomena by incorporating new processes into existing theories.
  • Observation of phenomena not explained by linear theory, attributed to nonlinear effects.

Conclusions:

  • Extended linear theory successfully explains many aspects of ion-induced surface patterning.
  • Nonlinear effects are crucial for understanding phenomena like amplitude saturation.
  • Further research is needed to fully elucidate nonlinear contributions to surface evolution.