Name the dispersion method by which gold sol can be prepared
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Mechanical dispersion
• In this method, the substance is first ground to coarse particles.
• It is then mixed with the dispersion medium to get a suspension.
• The suspension is then grinded in colloidal mill.
• It consists of two metallic discs nearly touching each other and rotating in opposite directions at a very high speed about 7000 revolution per minute.
• The space between the discs of the mill is so adjusted that coarse suspension is subjected to great shearing force giving rise to particles of colloidal size.
• Colloidal solutions of black ink, paints, varnishes, dyes etc. are obtained by this method
• In this method, the substance is first ground to coarse particles.
• It is then mixed with the dispersion medium to get a suspension.
• The suspension is then grinded in colloidal mill.
• It consists of two metallic discs nearly touching each other and rotating in opposite directions at a very high speed about 7000 revolution per minute.
• The space between the discs of the mill is so adjusted that coarse suspension is subjected to great shearing force giving rise to particles of colloidal size.
• Colloidal solutions of black ink, paints, varnishes, dyes etc. are obtained by this method
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