Adsorption and dispersion of talcum powder in different surfactant solutions / Aree Pinpiti = การดูดซับและการกระจายตัวของอนุภาคทัลคัมในสารละลายสารลดแรงตึงผิวที่แตกต่างกัน / อารีย์ ปิ่นปิติ
Sliders used to write and read data from the disk, require extremely low levels of impurities in the manufacturing process. The most common impurity found on the surface of sliders is identified as talcum powder. The dispersion stability is expected that related to prevent redeposition on the surface of slider in cleaning agent. The objective of this work was to investigate the surfactant adsorption and dispersion of talcum powders in different surfactant solutions. Surfactant solutions can enhance the dispersion stability of talcum powder as compared with in absence surfactant. The dispersion stability of talcum powder increased with increasing surfactant concentration Solution pH at low surfactant concentration affected on dispersion of talcum powder but at high surfactant concentration slightly affected on dispersion. SDS surfactant adsorbed with the highest adsorption density, leading to increase negative electrical zeta potentials that exhibited the highest dispersion stability. Adsorption of CTAB surfactant changed the negative charge surfaces to positive charge surfaces with increase positive electrical zeta potentials that can stabilize talcum powder to disperse. AE7 surfactant adsorbed on talcum powder with the lowest adsorption but the steric effect of surfactant adsorbed on surface can enhance the dispersion stability of talcum powder.
