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Preparation of ultra-stable foams stabilized by large-size platelet particles via direct foaming method
W. Huo, X. Zhang, B. Ren, J. Liu, D. Wang, J. Yang
Abstract
Stable colloidal foams that are usually stabilized by 0.02 – 5 μm particles have attracted increasing interests due to their outstanding stability. However, there were no studies on stable foams stabilized by large platelet particles so far. In this paper, we reported the study and successful preparation of ultra-stable foams using platelet particles with large particle size of dozens of microns for the first time, which subverts the conventional wisdom about particle-stabilized foams. Herein, intact platelet diatomite particles with diameter in the range of 10 – 50 μm was employed as starting material to prepare foams via mechanical frothing. The ultra-stability of foamed diatomite suspension was established by the well-ordered arrangement of whole lamellate diatomite particles at bubble interfaces in a very wide pH range of 4.0 – 12.0, using cetyltrimethyl ammonium bromide (CTAB) as surfactant. The obtained diatomite ceramic foams exhibited light weight and uniform macropores, and possessed four kinds of multilevel pores, which have potential applications in the fields of removal of fine particulate matter and treatment of waste gas and waste water.
Keywords
Stable foams, intact diatomite, platelet particles, particle size, multilevel pores
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