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Confocal Fluorescence Microscopy of the Morphology and Composition of Interstitial Fluids in Freezing Electrolyte Solutions

Cheng, Jie and Soetjipto, Cherrie and Hoffmann, Michael R. and Colussi, A. J. (2010) Confocal Fluorescence Microscopy of the Morphology and Composition of Interstitial Fluids in Freezing Electrolyte Solutions. Journal of Physical Chemistry Letters, 1 (1). pp. 374-378. ISSN 1948-7185. http://resolver.caltech.edu/CaltechAUTHORS:20100520-152149454

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Abstract

Ice rheology, the integrity of polar ice core records, and ice−atmosphere interactions are among the phenomena controlled by the morphology and composition of interstitial fluids threading polycrystalline ice. Herein, we investigate how ionic impurities affect such features via time-resolved confocal fluorescence microscopy of freezing electrolyte solutions doped with a pH probe. We find that the 10 μM probe accumulates into 12 μm thick glassy channels in frozen water, but it is incorporated into randomly distributed <1 μm diameter inclusions in freezing 1 mM NaCl. We infer that morphology is largely determined by the dynamic instabilities generated upon advancing ice by the rejected solute, rather than by thermodynamics. The protracted alkalinization of the fluid inclusions reveals that the excess negative charge generated by the preferential incorporation of Cl^− over Na^+ in ice is neutralized by the seepage of the OH^− slowly produced via H_2O → H^+ + OH^− thermal dissociation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/jz9000888DOIArticle
http://pubs.acs.org/doi/full/10.1021/jz9000888PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Colussi, A. J.0000-0002-3400-4101
Additional Information:© 2009 American Chemical Society. Received Date: October 4, 2009. Accepted Date: December 3, 2009. Publication Date (Web): December 10, 2009. This project was financially supported by the National Science Foundation (ATM-0534990). C.S. thanks a James J. Morgan SURF Fellowship.
Funders:
Funding AgencyGrant Number
NSFATM-0534990
James J. Morgan SURF FellowshipUNSPECIFIED
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Record Number:CaltechAUTHORS:20100520-152149454
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100520-152149454
Official Citation:Confocal Fluorescence Microscopy of the Morphology and Composition of Interstitial Fluids in Freezing Electrolyte Solutions Jie Cheng, Cherrie Soetjipto, Michael R. Hoffmann, A. J. Colussi The Journal of Physical Chemistry Letters 2010 1 (1), 374-378
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18376
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 May 2010 15:02
Last Modified:14 Dec 2015 19:47

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