I want measure the surface charge of a polymer film in the solid state without any contact with any liquid. Kindly let me know the technique for the same.
Is the surface charge the result of spontaneous polarization of the film? If so you can use the method exploiting the pyroelectric effect, a standard technique to measure polarization by integrating the displacement current that originates from a change in polarization.
Kelvin probe force microscope (KPFM) is an useful technique for measuring the surface charge on a polymer film. We measure KPFM in tapping mode so that no contact with liquid or any other substance is necessary.
More details on the technique can be found here:
http://kummelgroup.ucsd.edu/pubs/paper/110.pdf
if you want to scan a certain large area, maybe electrostatic voltmeter is a proper way.
You can see my web for reference.
@ K. Sreenivas, do you mind explaining the procedure or any reference?
Surface potential (zeta):
using an Electro kinetic Analyzer (EKA Sur PASS–type A, Anton Paar GmbH, Graz, Austria)
You can use the electrostatic voltmeter and Kelvin probe to measure surface charge distribution. References below may be useful for you:
[1] Boya Zhang, Guixin Zhang. Interpretation of the surface charge decay kinetics on insulators with different neutralization mechanisms. Journal of Applied Physics. 2017, 121(10): 105105.
[2] Boya Zhang, Zhe Qi, Guixin Zhang. Charge accumulation patterns on spacer surface in HVDC gas-insulated system: dominant uniform charging and random charge speckles. IEEE Transactions on Dielectrics and Electrical Insulation, 2017, 24(2): 1229-1238.
[3] Boya Zhang, Wenqiang Gao, Zhe Qi, Qiang Wang, Guixin Zhang. Inversion algorithm to calculate charge density on solid dielectric surface based on surface potential measurement. IEEE Transactions on Instrumentation and Measurement, 2017, 66(12): 3316-3326.
Dear Sajan Jose，
The attached file may be useful for you. In this paper, the inversion algorithm methods used to determine surface charges over the past few decades were summarized, and their advantages and disadvantages were discussed. Based on the previous charge inversion algorithms, an improved surface charge inversion algorithm considering the surface potential of both sides of a cone-type model spacer was developed.
Kind regards.
Chuanyang
Following the true comment of my dear friend Reguig, you can use some commercial equipments like non-contacting electrostatic voltmeter (TREK Co.).
please have a look at http://www.kleinwaechtergmbh.de/cms/front_content.php?idcat=41 and use an E-Field Meter. Otherwise see the Textbook Static Electrcity http://www.wiley-vch.de/de?option=com_eshop&view=product&isbn=9783527341283
if you want to check many samples please have a look at www.quma.com for QUMAT 528. I developed this together with Quma
- Badges
- Science topic