In situ charge neutralization-controlled particle coagulation and its effects on the particle size distribution in the one-step emulsion polymerization

Triboelectric charging is a potentially suitable tool for separating fine dry powders, but the charging process is not yet completely understood. Although physical descriptions of triboelectric charging have been proposed, these proposals generally assume the standard conditions of particles and surfaces without considering dispersity. To better understand the influence of particle charge on particle size distribution, we determined the in situ particle size in a protein–starch mixture injected into a separation chamber. The particle size distribution of the mixture was determined near the electrodes at different distances from the separation chamber inlet. The particle size decreased along both electrodes, indicating a higher protein than starch content near the electrodes. Moreover, the height distribution of the powder deposition and protein content along the electrodes were determined in further experiments, and the minimum charge of a particle that ensures its separation in a given region of the separation chamber was determined in a computational fluid dynamics simulation. According to the results, the charge on the particles is distributed and apparently independent of particle size.

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Semibatch Seeded Emulsion Polymerization of Acrylic Monomers: Bimodal Particle Size Distribution

Journal of Macromolecular Science Part A ◽

10.1080/10601329708009381 ◽

1997 ◽

Vol 34 (7) ◽

pp. 1221-1236 ◽

Cited By ~ 17

Author(s):

Chorng-Shyan Chern ◽

Tseng-Jung Chen ◽

Shinn-Yih Wu ◽

Horng-Bin Chu ◽

Chun-Fu Huang

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Emulsion Polymerization ◽

Seeded Emulsion Polymerization ◽

Acrylic Monomers

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Observations of the Particle Size Distribution and Concentration in a Coastal System using an In Situ Laser Analyzer

Marine Technology Society Journal ◽

10.4031/002533202787914304 ◽

2002 ◽

Vol 36 (1) ◽

pp. 59-69 ◽

Cited By ~ 11

Author(s):

Teresa Serra ◽

Xavier Casamitjana ◽

Jordi Colomer ◽

Timothy C. Granata

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Water Column ◽

Size Distribution ◽

Posidonia Oceanica ◽

High Energy ◽

Suspended Particles ◽

Energy Conditions ◽

Coastal System

An in situ laser particle size analyzer (LISST-100, Sequoia Scientific, Inc.) has been used to study the particle size distribution and concentration of biological and non biological particles in the water column of a Mediterranean coastal system. Two field campaigns have been carried out during low and high energy conditions of the flow, caused by the passage of a storm front. For the low energy period, the water column remained stratified, whereas for the high energetic period the water column was warmer and well mixed. The first study dealt with the distribution of particles near the bottom of the coastal area. Here, two regions were taken into account. The first region was a sea-grass meadow of Posidonia oceanica and the second region was a barren sand area. The second study dealt with the determination of the vertical distribution of suspended particles in the whole water column of the system. The results showed a decrease in the vertical concentration of suspended particles in the water column with the passage of the storm front, which was associated with advection of warm water mass rather than by vertical mixing. In contrast, vertical resuspension determined the fate of suspended particles at the bottom of the water column and an increase of their concentration was found.

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