Multicharge zwitterionic molecules: Hydration, kosmotropicity and anti-fouling potential.

Area of Science:

• Physical Chemistry
• Materials Science
• Surface Chemistry

Background:

• Understanding the physico-chemical behavior of zwitterions and tetraalkylammonium salts in aqueous solutions is crucial for designing advanced materials.
• Investigating molecular architecture and charge effects on surface hydration and interactions informs the development of anti-fouling surfaces.

Purpose of the Study:

• To comparatively study the physico-chemical properties of single/double zwitterions and tetraalkylammonium salts.
• To elucidate the impact of molecular charge (two vs. four) on surface hydration, kosmotropicity, and surface interactions.
• To evaluate the potential of multicharged zwitterionic materials for anti-fouling surface applications.

Main Methods:

• Experimental determination of density and viscosity in highly diluted aqueous solutions.
• Calculation of Jones-Dole viscosity B-coefficient, partial molal volumes, and hydration numbers.
• Assessment of salt effects on surfactant properties, non-ionic surfactant phase behavior, amino acid solubility, and protein stability.

Main Results:

• Physico-chemical behavior of sulfobetaine-type zwitterions and tetraalkylammonium salts were characterized.
• The study quantified hydration numbers and kosmotropic effects influenced by molecular architecture and charge.
• Multicharged zwitterionic materials demonstrated enhanced performance in resisting protein attachment.

Conclusions:

• Novel multicharged zwitterionic materials exhibit superior qualities for anti-fouling applications.
• The findings support a new platform for designing hydrophilic and anti-fouling surfaces.
• Four-charge bearing molecular motifs are key to developing effective anti-fouling strategies.