Menu

Discussion Forum

New Discussion
Filtrer

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

AC/DC Module, Surface current density, Layer thickness of Nanoparticles on Polymer

Posted 6 mai 2021, 17:55 UTC−4 Low-Frequency Electromagnetics Version 5.5 4 Replies

Md Didarul Islam
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello,

I am trying to build a model of nanoparticles in a polymer. The object is to evaluate the Terminal current and surface current density accross the polymer. One example from the blog, "MAxwell-wagner-Permittivity of Blood" was really helpful. However, unlike their model, my model does not have an intermediate layer between the nanoparticle and the matrix. The model is as below image.

[Image]

My questions are as follows -- 1. Do I need to put a contact impedence BC for the surface of the nanoparticles? 2. If yes, what "Surface thickness (Thin layer)" or "Surface impedance" properties should I use? Note: I am only putting nanoparticles (Such as - TiO2) in polymer (such as - PMMA).

The terminal current is almost the same if I use or do not use the Contact impedence condition, but the surface current density is completey different!

Thank you.

Best, Didar

Attachments:

4 Replies Last Post 9 mai 2021, 11:18 UTC−4
Edgar J. Kaiser Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 4 years ago 7 mai 2021, 13:24 UTC−4

Didar,

if you aren't considering a contact layer in your model, you probably don't need it. The electrical contact between the domains is established automatically in a Form Union. It is to be expected to change the results if you use it nevertheless.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Didar, if you aren't considering a contact layer in your model, you probably don't need it. The electrical contact between the domains is established automatically in a Form Union. It is to be expected to change the results if you use it nevertheless. Cheers Edgar
Md Didarul Islam
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 4 years ago 7 mai 2021, 15:42 UTC−4
Updated: 4 years ago 7 mai 2021, 15:44 UTC−4

Hi Dr. Edgar,

Thank you, that was indeed helpful.

I had another question, related to this. If I extract the "Surface Charge Density" from the results, the unit I see is C/m^3. I do not quite uniderstand, though I have 2D model, how can the unit be m^3?

[Attached Image]

Thank you.

Hi Dr. Edgar, Thank you, that was indeed helpful. I had another question, related to this. If I extract the "Surface Charge Density" from the results, the unit I see is C/m^3. I do not quite uniderstand, though I have 2D model, how can the unit be m^3? [Attached Image] Thank you.

Attachments:

Edgar J. Kaiser Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 4 years ago 8 mai 2021, 04:21 UTC−4

The root physics node in 2D has a setting for model length in the 3rd dimension. The volumetric charge density takes this into account.

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
The root physics node in 2D has a setting for model length in the 3rd dimension. The volumetric charge density takes this into account. Cheers Edgar
Md Didarul Islam
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 4 years ago 9 mai 2021, 11:18 UTC−4

Thank you Dr. Edgar, that was relly helpful.

Thank you Dr. Edgar, that was relly helpful.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content