Anisotropy of silica aerogels induced by small strain

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

doi:10.1007/s10909-012-0753-x

Anisotropy of silica aerogels induced by small strain

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

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We have performed optical birefringence measurements on isotropic aerogel samples grown with varying amounts of ammonia catalyst to determine the relationship between stress, strain, and transmitted light intensity, focusing on the regime of relatively small axial strain. We find that our samples exhibit a delayed onset of birefringence at ∼3 % strain, beyond which the transmitted intensity increases linearly, with a faster rate of increase for samples prepared with larger catalyst concentrations. We have also calculated the sound velocity from the slope of the stress-strain curve, and found an approximately linear increase with catalyst solution pH for samples of similar density. Samples of similar density also appear to exhibit a universal relationship between applied stress and transmitted intensity. We are not able to identify the mechanism for this unique behavior.

Original language	English
Pages (from-to)	745-749
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	171
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-012-0753-x
State	Published - Jun 2013

Bibliographical note

Funding Information:
We gratefully acknowledge support from the National Science Foundation, DMR-

Funding

We gratefully acknowledge support from the National Science Foundation, DMR-

Funders	Funder number
Division of Materials Research
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1103625

Keywords

Aerogel
Superfluid He

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

Access to Document

10.1007/s10909-012-0753-x

Cite this

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title = "Anisotropy of silica aerogels induced by small strain",

abstract = "We have performed optical birefringence measurements on isotropic aerogel samples grown with varying amounts of ammonia catalyst to determine the relationship between stress, strain, and transmitted light intensity, focusing on the regime of relatively small axial strain. We find that our samples exhibit a delayed onset of birefringence at ∼3 \% strain, beyond which the transmitted intensity increases linearly, with a faster rate of increase for samples prepared with larger catalyst concentrations. We have also calculated the sound velocity from the slope of the stress-strain curve, and found an approximately linear increase with catalyst solution pH for samples of similar density. Samples of similar density also appear to exhibit a universal relationship between applied stress and transmitted intensity. We are not able to identify the mechanism for this unique behavior.",

keywords = "Aerogel, Superfluid He",

author = "Zimmerman, \{A. M.\} and Specht, \{M. G.\} and D. Ginzburg and J. Pollanen and Li, \{J. I.A.\} and Collett, \{C. A.\} and Gannon, \{W. J.\} and Halperin, \{W. P.\}",

note = "Funding Information: We gratefully acknowledge support from the National Science Foundation, DMR-",

year = "2013",

month = jun,

doi = "10.1007/s10909-012-0753-x",

language = "English",

volume = "171",

pages = "745--749",

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T1 - Anisotropy of silica aerogels induced by small strain

AU - Zimmerman, A. M.

AU - Specht, M. G.

AU - Ginzburg, D.

AU - Pollanen, J.

AU - Li, J. I.A.

AU - Collett, C. A.

AU - Gannon, W. J.

AU - Halperin, W. P.

N1 - Funding Information: We gratefully acknowledge support from the National Science Foundation, DMR-

PY - 2013/6

Y1 - 2013/6

N2 - We have performed optical birefringence measurements on isotropic aerogel samples grown with varying amounts of ammonia catalyst to determine the relationship between stress, strain, and transmitted light intensity, focusing on the regime of relatively small axial strain. We find that our samples exhibit a delayed onset of birefringence at ∼3 % strain, beyond which the transmitted intensity increases linearly, with a faster rate of increase for samples prepared with larger catalyst concentrations. We have also calculated the sound velocity from the slope of the stress-strain curve, and found an approximately linear increase with catalyst solution pH for samples of similar density. Samples of similar density also appear to exhibit a universal relationship between applied stress and transmitted intensity. We are not able to identify the mechanism for this unique behavior.

AB - We have performed optical birefringence measurements on isotropic aerogel samples grown with varying amounts of ammonia catalyst to determine the relationship between stress, strain, and transmitted light intensity, focusing on the regime of relatively small axial strain. We find that our samples exhibit a delayed onset of birefringence at ∼3 % strain, beyond which the transmitted intensity increases linearly, with a faster rate of increase for samples prepared with larger catalyst concentrations. We have also calculated the sound velocity from the slope of the stress-strain curve, and found an approximately linear increase with catalyst solution pH for samples of similar density. Samples of similar density also appear to exhibit a universal relationship between applied stress and transmitted intensity. We are not able to identify the mechanism for this unique behavior.

KW - Aerogel

KW - Superfluid He

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VL - 171

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JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 5-6

ER -

Anisotropy of silica aerogels induced by small strain

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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