Preparation of super-clean coal: Zeta potential measurements on miocrobubbles generated using various surfactants. Technical progress report, September 15, 1984-March 14, 1985

Technical Report · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5663348

Yoon, R H; Adel, G T; Yordan, J L

The zeta potentials of microbubbles in the 40- to 80-micron size range have been determined by means of a simple microelectrophoresis technique. In general, the bubble charge is determined by the charge of the polar head of the surfactants when ionic surfactants are used to produce the bubbles. However, the magnitude of the zeta potentials is reduced when the surfactants are hydrolyzed. When using nonionic surfactants, the bubbles exhibit isoelectric points (i.e.p.) in acidic and neutral pH ranges. It appears that the location of an i.e.p. is determined by the acid-base property of the surfactant molecule used. The negative charges observed with air bubbles and oil droplets in the absence of surfactants can be explained by the differences in the hydration energies of H/sup +/ and OH/sup -/ ions. An increase in the concentration of ionic surfactants results in an increase in bubble charge. However, the increase is minimal or non-existant when nonionic surfactants are used. 16 refs., 16 figs., 1 tab.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg (USA). Dept. of Mining and Minerals Engineering
• DOE Contract Number: FG22-83PC60806
• OSTI ID: 5663348
• Report Number(s): DOE/PC/60806-T3; ON: DE85012998
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BUBBLES
CARBONACEOUS MATERIALS
CLEANING
COAL
DATA
ELECTROPHORESIS
ENERGY SOURCES
EXPERIMENTAL DATA
FLOTATION
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
NUMERICAL DATA
PH VALUE
REAGENTS
RESEARCH PROGRAMS
SEPARATION PROCESSES
SURFACTANTS