Nanoparticle-Loaded Cylindrical Micelles from Nanopore Extrusion of Block Copolymer Spherical Micelles

Fusion and clustering of spherical micelles by extruding through a cylindrical channel

Experiments have shown that worm-like cylindrical micelles can be obtained by extruding spherical micelles through a cylindrical channel.

Nanomaterial Preparation by Extrusion through Nanoporous Membranes

Template synthesis represents an important class of nanofabrication methods. Herein, recent advances in nanomaterial preparation by extrusion through nanoporous membranes that preserve the template membrane without sacrificing it, which is termed as "non-sacrificing template synthesis," are reviewed. First, the types of nanoporous membranes used in nanoporous membrane extrusion applications are introduced. Next, four common nanoporous membrane extrusion strategies: vesicle extrusion, membrane emulsification, precipitation extrusion, and biological membrane extrusion, are examined. These methods have been utilized to prepare a wide range of nanomaterials, including liposomes, emulsions, nanoparticles, nanofibers, and nanotubes. The principle and historical context of each specific technology are discussed, presenting prominent examples and evaluating their positive and negative features. Finally, the current challenges and future opportunities of nanoporous membrane extrusion methods are discussed.

Synthesis of polymeric nano-objects of various morphologies based on block copolymer self-assembly using microporous membranes

Polymeric nano-objects of a range of morphologies have been prepared using a novel approach based on the use of microporous membranes for mixing of a solvent (containing a diblock copolymer) and a non-solvent.

Stereocomplex poly(lactic acid) nanoparticles crystallized through nanoporous membranes and application as nucleating agent

Stereocomplex crystallization of poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) was performed by flowing their blended solution through nano-channels of porous membranes.

Enhanced fluid flow through nanopores by polymer brushes

In the past few decades, much research has been devoted to nanoscale transport, despite its complexity. Here we present results, which are counterintuitive, showing that adsorption of the polystyrene-b-polyisoprene (PS-b-PI) diblock copolymer to the aluminum oxide nanopore membrane wall considerably reduces the friction of the organic solvents passing through the nanopore channels. The estimated apparent slip length for tetrahydrofuran (THF) liquid flow through 20 nm nanopore membranes increases from 0.13-0.16 μm for the bare nanopore to 3-13 μm after PS-b-PI polymer physisorbed to the pore surface to saturation. For the bare nanopore membranes, the slip length remains constant at different flow rates while after polymer adsorption it increases with the liquid flow shear rate. The shear rate dependence of the slip length is understandable from the point of view of polymer chains stretching dynamics under shear flow. The findings of this study may aid in understanding the physics of nannofluidics and have implications for biolubrication effects in biological systems.