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pH-Induced evolution of surface patterns in micelles assembled from dirhamnolipids: dissipative particle dynamics
Jianchang Xu1, Shuangqing Sun2, Zhikun Wang2
1School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China. celjzh@scut.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|March 23, 2018
Summary
pH-driven changes in dirhamnolipids (diRLs) alter micelle structures, creating diverse surface patterns. These findings could advance applications in drug delivery and functional materials.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Computational Chemistry
Background:
- Dirhamnolipids (diRLs) are amphiphilic molecules with potential in self-assembly.
- Understanding pH-induced morphological transitions is crucial for controlling self-assembled structures.
Purpose of the Study:
- To investigate the effect of pH on micelle morphology and surface patterns of dirhamnolipids (diRLs).
- To elucidate the pH-driven mechanism and influencing factors behind micellar surface pattern formation.
Main Methods:
- Dissipative Particle Dynamics (DPD) simulations were employed.
- Analysis of molecular arrangement and assembly processes under varying pH conditions.
Main Results:
- At pH < 4.0, multilayer structures with homogeneous surface patterns were observed.
- At pH > 7.4, novel anisotropic morphologies with phase-separated patterns emerged, including patchy spheres and helical rods.
- Changes in surface patterns are linked to carboxyl group deprotonation and factors like molecular structure and solvent polarity.
Conclusions:
- pH significantly influences diRL micelle morphology and surface patterns.
- Control over molecular arrangement and assembly factors can yield diverse, tunable surface patterns.
- This research opens avenues for diRLs in advanced functional materials for drug delivery, optoelectronics, and membranes.
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