On the formation and structure of nanometric polyhedral foams: toward the dry limit

Langmuir : the ACS Journal of Surfaces and Colloids
Robert W Corkery, Andrew Fogden

Abstract

High surface area, high porosity, nanometric polygonal silica foams with hierarchically connected and uniformly sized pore systems are reported here. We observe a remarkable increase in foam cell sizes from mesoscopic to macroscopic dimensions upon swelling the self-assembled template with oil. The resultant structures resemble classical macroscopic soap foams and display, among other features, Plateau borders and volume fractions approaching the dry limit of 100%. In well-developed foams of this kind, dimensionally isometric polyhedral cells are connected by relatively short, flat cylindrical mesopores through polyhedral faces and micropores through the walls. For one sample, with approximately 75 nm diameter primary foam cells, we infer three separate sets of cell-connecting mesopores puncturing tetragonal, pentagonal, and hexagonal faces of the component polyhedra. A multiple step model of foam formation is discussed where an organic silica precursor progressively hydrolyzes and condenses as a growing flexible shell from the core-corona interface of oil-swollen triblock copolymer micelles or microemulsion droplets, inducing a clouding phenomena in the otherwise stabilizing poly(ethylene oxide) chains, leading to aggregation,...Continue Reading

References

Apr 12, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Andrew M KraynikFrank van Swol
Dec 17, 2004·Physical Review Letters·Andrew M KraynikFrank van Swol
Mar 19, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Katarina FlodströmViveka Alfredsson
Jun 30, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Katarina FlodströmMika Lindén
Oct 15, 2005·The Journal of Chemical Physics·Supriyo Bhattacharya, Keith E Gubbins
Nov 3, 2006·The Journal of Physical Chemistry. B·T G MasonM Y Lin
Feb 20, 2007·Chemical Communications : Chem Comm·Marianne Impéror-ClercVladimir L Zholobenko
Mar 28, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Dulce Vargas-FlorenciaRobert W Corkery

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