Anisotropy of Silica Aerogels Induced by Small Strain

Zimmerman, A. M.; Specht, M.; Ginzburg, Daniel; Pollanen, J.; Li, J. I. A.; Collett, C. A.; Gannon, W. J.; Halperin, W. P.

doi:10.1007/s10909-012-0753-x

Cited by 14 publications

(17 citation statements)

References 7 publications

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“…Similar levels of positive strain, called stretching, can be produced during stages of growth and supercritical drying. 38 Furthermore, the optical birefringence signal provides a simple but quantitative assessment of the degree of anisotropy imposed on the aerogel by either positive or negative strain, 44,45 confirmed with measurements of the mean free path using methanol gas diffusion. 46 For nafen aerogels the anisotropy of the mean-free-path was measured by spin diffusion of 3 He in the normal liquid.…”

Section: Silica Aerogelmentioning

confidence: 68%

Superfluid³He in Aerogel

Halperin

2019

Annu. Rev. Condens. Matter Phys.

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Superfluid 3 He is an unconventional neutral superfluid in a p-wave state with three different superfluid phases each identified by a unique set of characteristic broken symmetries and nontrivial topology. Despite natural immunity of 3 He from defects and impurity of any kind, it has been found that they can be artificially introduced with high porosity silica aerogel. Furthermore, it has been shown that this modified quantum liquid becomes a superfluid with remarkably sharp thermodynamic transitions from the normal state and between its various phases. They include new superfluid phases that are stabilized by anisotropy from uniform strain imposed on the silica aerogel framework and they include new phenomena in a new class of anisotropic aerogels consisting of nematically ordered alumina strands. The study of superfluid 3 He in the presence of correlated, quenched disorder from aerogel, serves as a model for understanding the effect of impurities on the symmetry and topology of unconventional superconductors.

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Section: Silica Aerogelmentioning

confidence: 68%

Superfluid³He in Aerogel

Halperin

2019

Annu. Rev. Condens. Matter Phys.

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“…They were grown with a one-step method and rapid supercritical extraction of the solvent. 13,14 The surface area of the aerogel from nitrogen adsorption (BET) 15 is ∼400 m 2 /g and the mean distance between silica strands, i.e. the aerogel correlation length, can be estimated from numerical calculations to be ∼50 nm.…”

Section: B Aerogel Samplesmentioning

confidence: 99%

Enhanced self-diffusion of adsorbed methanol in silica aerogel

Lee

Mounce

et al. 2014

Phys. Rev. B

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Molecular transport of a two-component system of liquid and vapor in a porous medium can be anomalously increased owing to fast exchange between the two phases. 1 We have investigated this phenomenon measuring the self-diffusion coefficient of methanol adsorbed in a 98% porosity aerogel using nuclear magnetic resonance (NMR) field gradient techniques. We found enhancement of several orders of magnitude from which we determined the ballistic mean-free-path in the vapor phase. We have grown globally uniform anisotropic aerogels and applied the diffusion measurements to characterize the anisotropy. Our results are important for understanding the novel properties of superfluid 3 He confined within an aerogel framework and for application to other physical systems.

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“…1(a) [11,12]. We strained these samples −11.7% (b12), −19.8% (b20), and −30.0% (b30) by mechanical compression measured as a displacement at room temperature.…”

mentioning

confidence: 99%

Anisotropic Phases of SuperfluidHe3in Compressed Aerogel

Zimmerman

Pollanen

et al. 2015

Phys. Rev. Lett.

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Anisotropy of Silica Aerogels Induced by Small Strain

Cited by 14 publications

References 7 publications

Superfluid³He in Aerogel

Superfluid³He in Aerogel

Enhanced self-diffusion of adsorbed methanol in silica aerogel

Anisotropic Phases of SuperfluidHe3in Compressed Aerogel

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Anisotropy of Silica Aerogels Induced by Small Strain

Cited by 14 publications

References 7 publications

Superfluid3He in Aerogel

Superfluid3He in Aerogel

Enhanced self-diffusion of adsorbed methanol in silica aerogel

Anisotropic Phases of SuperfluidHe3in Compressed Aerogel

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Product

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Superfluid³He in Aerogel

Superfluid³He in Aerogel