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A novel sensing technique for measurement of magnitude and polarity of electrostatic charge distribution across individual particles

A novel sensing technique for measurement of magnitude and polarity of electrostatic charge distribution across individual particles

Hussain, Tariq, Kaialy, Waseem, Deng, Tong, Bradley, Mike S.A., Nokhodchi, Ali and Armour-Chélu, David (2012) A novel sensing technique for measurement of magnitude and polarity of electrostatic charge distribution across individual particles. International Journal of Pharmaceutics, 441 (1-2). pp. 781-789. ISSN 0378-5173 (doi:10.1016/j.ijpharm.2012.10.002)

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Abstract

Electrostatic charge is generated during powder handling due to particle–particle and particle–wall collisions, rubbing, sliding, and rolling. In case of bipolar charge generation, the electrostatic forces may significantly change the inner forces and increase powder adhesion and cause a serious problem in material handling process. Therefore, the knowledge of distribution of charge across the individual particles is helpful to identify the role of triboelectrification and the effects of various relevant variables especially change in the contact materials, environmental conditions during processing, etc. A novel approach based on inductive sensor has been developed to detect the either polarity of charged particle and to characterise the bipolar charge distribution in the population of particulate material. To achieve this, an amplification unit configured as a pure integrator and signal processing techniques has been used to de-noise and correct the baseline of signal and MATLAB algorithm developed for peak detection. The polarity of charged particles obtained by this method is calibrated with Faraday pail method and the results are promising. Experimental study has been carried out by using two distinct populations of oppositely charged particles (glass beads-PVC, olivine sand, and silica sand). The obtained results indicate that the method is able to detect the distribution of polarities of charged particles.

Item Type: Article
Uncontrolled Keywords: electrostatic charge, powder blending, inductive sensor, bipolar charge, particulate material
Subjects: R Medicine > RS Pharmacy and materia medica
T Technology > TP Chemical technology
Faculty / Department / Research Group: Faculty of Engineering & Science > Medway School of Pharmacy
Faculty of Engineering & Science > Wolfson Centre for Bulk Solids Handling Technology
Related URLs:
Last Modified: 17 Oct 2016 10:03
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/10469

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