Interactions between Nanoclay, CTAB and Linear/Star Shaped Polymers
Elżbieta Grządka1, Ewelina Godek1, Grzegorz Słowik2
1Department of Radiochemistry and Environmental Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University, M. Skłodowskiej-Curie 3 Sq., 20-031 Lublin, Poland.
International Journal of Molecular Sciences
|March 25, 2022
Summary
Polyacrylic acid (PAA) effectively stabilizes nanoclay suspensions. Adding hexadecyltrimethylammonium bromide (CTAB) enhances stability, particularly with high-molecular-weight PAA, aiding water purification composite development.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
- Environmental Engineering
Background:
- Nanoclay suspensions require effective stabilization for practical applications.
- Polymeric stabilizers and surfactants are crucial for modifying suspension properties.
- Understanding adsorption behavior is key to designing functional nanocomposites.
Purpose of the Study:
- To investigate the impact of polyacrylic acid (PAA) structure and molecular weight on PAA/CTAB/nanoclay suspensions.
- To analyze the adsorption layer, adsorption capacity, and electrokinetic properties.
- To evaluate the stabilizing effects of PAA and CTAB on surface-modified nanoclay (N-SM).
Main Methods:
- Utilized a suite of analytical techniques including BET, CHN, FT-IR, ED-XRF, XRD, HRTEM, UV-Vis, tensiometry, and zeta potential measurements.
- Studied systems containing linear and star-shaped PAA (high and low molecular weights), CTAB, and N-SM.
- Characterized adsorption layers, adsorption amounts, and suspension stability.
Main Results:
- PAA demonstrated effective stabilization of N-SM.
- CTAB addition significantly increased system stability but reduced PAA adsorption on N-SM.
- High-molecular-weight PAA (PAA-HMW) in combination with CTAB yielded the highest stability.
- Adsorbed PAA and PAA/CTAB complexes influenced sheet distribution without altering basal d-spacing, adsorbing primarily at plate edges.
Conclusions:
- PAA is a viable stabilizer for N-SM.
- The PAA/CTAB system offers enhanced stability for nanoclay suspensions.
- These findings support the development of PAA/CTAB/nanoclay composites for water purification applications.
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