Electrostatics of particles

Matsusaka, Shuji; Masuda, Hiroaki

doi:10.1163/156855203763593958

Cited by 161 publications

(69 citation statements)

References 40 publications

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“…This phenomenon is often called 'contact electrification' or contact charging'. When rubbed, the particle is known as 'frictional electrification' or 'tribo-charging' (Matsusaka and Masuda, 2003). This phenomenon is commonly a nuisance (Nifuku et al, 1989) and can become a source of explosion hazard (Zhang et al, 2008), However, various applications such as electro photography (Schein, 1999), dry powder coating (Bailey, 1998), powder flow measurement (Masuda et al, 1998) and tomography (Green et al, 1997;Yan and Byrne, 1997;Machida and Scarlett, 2005) have been developed as a result of this phenomenon.…”

Section: Electrodynamics Sensormentioning

confidence: 99%

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Image Reconstruction Algorithm for Electrical Charge Tomography System

Rahmat¹,

Isa²,

Jusoff³

et al. 2010

American Journal of Applied Sciences

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Problem statement: Many problems in scientific computing can be formulated as inverse problem. A vast majority of these problems are ill-posed problems. In Electrical Charge Tomography (EChT), normally the sensitivity matrix generated from forward modeling is very ill-condition. This condition posts difficulties to the inverse problem solution especially in the accuracy and stability of the image being reconstructed. The objective of this study is to reconstruct the image cross-section of the material in pipeline gravity dropped mode conveyor as well to solve the ill-condition of matrix sensitivity. Approach: Least Square with Regularization (LSR) method had been introduced to reconstruct the image and the electrodynamics sensor was used to capture the data that installed around the pipe. Results: The images were validated using digital imaging technique and Singular Value Decomposition (SVD) method. The results showed that image reconstructed by this method produces a good promise in terms of accuracy and stability. Conclusion: This implied that LSR method provides good and promising result in terms of accuracy and stability of the image being reconstructed. As a result, an efficient method for electrical charge tomography image reconstruction has been introduced.

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Section: Electrodynamics Sensormentioning

confidence: 99%

“…Singular Value Decomposition (SVD) method can easily reveal this problem using Picard chart and the condition number of matrix sensitivity (Hansen and O'Leary, 1993). A classical example of an ill-posed problem is the Fredholm integral equation of the first kind with a square integrals kernel (Matsusaka and Masuda, 2003) as Eq. 1:…”

Section: Introductionmentioning

confidence: 99%

Image Reconstruction Algorithm for Electrical Charge Tomography System

Rahmat¹,

Isa²,

Jusoff³

et al. 2010

American Journal of Applied Sciences

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“…Therefore, electron can move freely within a metal and the work function is the energy difference between the Fermi levels and the vacuum. For insulators, the Fermi level lies in the large band gap that exits between the valance and the conduction band, indicating that no electrons are present in the conduction band and it therefore has a much higher work function energy (31)(32)(33). During contact charging, two materials come in contact and electrons will transfer from lower to higher work function in attempt to reach thermodynamic equilibrium (34).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Active Pharmaceutical Ingredients on Aerosol Electrostatic Charges from Pressurized Metered Dose Inhalers

et al. 2015

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“…In many cases, the excessive triboelectrification of powders is problematic: in the extreme, it may lead to dust explosions, but even at more modest levels, may give rise to segregation of components (Šupuk et al, 2011) affecting the content uniformity. Furthermore, when materials become charged, their behaviour can change leading to increased inter-particle cohesion or repelling of other charged materials (Matsusaka et al, 2010) which has an effect of reducing the flow and creating the resistance resulting in deposition and blockage of pipes (Matsusaka and Masuda 2003).…”

Section: Introductionmentioning

confidence: 99%

The influence of salt formation on electrostatic and compression properties of flurbiprofen salts

Šupuk

Ghori

Asare-Addo

et al. 2013

International Journal of Pharmaceutics

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Salt formation is an effective method of improving physicochemical properties of acidic and basic drugs. The selection of a salt form most suitable for drug development requires a welldesigned screening strategy to ensure various issues are addressed in the early development stages.Triboelectrification of pharmaceutical powders may cause problems during processing such as segregation of components due to the effects of particle adhesion. However, very little work has been done on the effect of salt formation on triboelectrification properties. In this paper, salts of flurbiprofen were prepared by combining the drug with a selection of closely related amine counterions. The aim of the work was to investigate the impact of the counter ion on electrostatic charge of the resultant salts to inform the salt selection process. The experimental results show the magnitude of charge and polarity of the flurbiprofen salts to be highly dependent on the type of counter ion selected for the salt formation. Furthermore, particle adhesion to the stainless steel surface of the shaking container and the salts' compression properties were measured. The formed salts had lower electrostatic charges, improved tabletability, and resulted in reduced adhesion of these powders compared with the parent drug.

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Electrostatics of particles

Cited by 161 publications

References 40 publications

Image Reconstruction Algorithm for Electrical Charge Tomography System

Image Reconstruction Algorithm for Electrical Charge Tomography System

The Effect of Active Pharmaceutical Ingredients on Aerosol Electrostatic Charges from Pressurized Metered Dose Inhalers

The influence of salt formation on electrostatic and compression properties of flurbiprofen salts

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