Controlling Wettability And Hydrophobicity Of Organoclays Modified With Quaternary Ammonium Surfactants
Student Team/ Author :
Manish Kumar Mishra,dinesh O. Shah,Toyoko Imae,atindra D. shukla
Guide By :
atindra D. Shukla
Degree :
College :
SSCSSN, DDUniversity, Nadiad
The montmorillonite clays were modified with quaternary ammonium salts (QASs) having different alkyl
chain lengths and a benzyl substitute group. The modified organoclays were characterized by different
analytical techniques. The wettability and hydrophilicity/hydrophobicity of the modified clays was evaluated using water or oil penetration (adsorption) and contact angle measurements. The loading of QASs
was in the range of 0.60–0.75 mmol/g per clay, irrespective of the type of QAS used for the modification of
the clay. From the analytical investigations, it was elucidated that the modification of clay with QAS
affected the structural, textural, and surface properties. Moreover, it should be noted that the modification with QAS having benzyl substitute group resulted in water-non-wettable and superhydrophobic surface, whereas clays modified with QAS without benzyl substitute group became more water-wettable
and hydrophilic than the pristine clay. The presence of benzyl groups on the clay prevents water from
penetration into the inter-clay or interlayer spacing, which yields the hyd
To our knowledge, this is the first report which uses liquid penetration as a tool to compare the wettability.
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Results emphasize the importance functional group attached to cationic moiety in controlling clay surface properties.
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Two techniques are utilized viz., contact angle and liquid penetration to exhibit the behavior of the modified clays.
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This report reveals that longer chain on cationic moiety is not the most effective way to hydrophobize the clay.
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