Temperature-Responsive Nanoporous Membranes from Self-Assembly of Poly(

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Nanoporous membranes are essential for various separation processes, including water treatment and biotechnology.
• Current methods for creating mechanically robust and tunable nanoporous membranes are limited.
• Developing membranes with adjustable separation properties is crucial for advanced applications.

Purpose of the Study:

• To introduce a novel family of tunable nanoporous membranes.
• To demonstrate the preparation and characterization of mechanically robust membranes with temperature-responsive properties.
• To explore the potential of these membranes in separation technologies and microfluidic devices.

Main Methods:

• Preparation of hairy nanoparticles (HNPs) decorated with poly(N-isopropylacrylamide) (PNIPAM) polymer brushes.
• Assembly of HNPs into thin films using pressure-driven deposition.
• Measurement of membrane permeability and filtration cutoff at varying temperatures.
• Molecular dynamics simulations to understand pore size control mechanisms.

Main Results:

• Mechanically robust nanoporous membranes were successfully fabricated from HNPs.
• Membrane pore diameter ranged from 10-30 nm at room temperature, tunable by polymer brush length.
• Water permeability and effective pore size (up to 100 nm) were controlled by temperature, increasing significantly at 60 °C.
• Temperature-dependent attenuation of size selectivity in nanoparticle filtration was observed.

Conclusions:

• The developed hairy nanoparticle membranes offer tunable pore sizes and permeability through temperature responsiveness.
• These membranes provide a robust platform for advanced separation processes.
• The findings suggest potential applications in responsive microfluidic devices and tailored filtration systems.