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Cryoporometry in Femtoliter Volumes by Confocal Raman Spectroscopy
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry.ORCID iD: 0000-0002-1694-2364
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Surface and Corrosion Science.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-0231-3970
2019 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 35, no 26, p. 8823-8828Article in journal (Refereed) Published
Abstract [en]

The properties of porous material are largely dependent on the size, shape, and connectivity of the pores. Here, we present a method based on confocal Raman spectroscopy to quantify porosity using a cryoporometric approach. We show that the phase transition of water imbibed in porous silica can be accurately determined using two different, but complementary methodologies. The first one relies on integrating the temperature-dependent spectral intensities across the whole OH (H2O) or OD (D2O) stretching region. The second, more quantitative approach, deconvolutes the spectral contributions within the pores in terms of liquid and solid fractions. The results show the expected reciprocal dependence of the average phase transition point with pore size, as well as the typical hysteresis between the freezing and melting transitions. One of the key advantages of the confocal Raman approach is its high spatial resolution, with sampling volumes starting from just a few femtoliters, opening the possibility of mapping the structure in heterogeneous porous materials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 35, no 26, p. 8823-8828
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-255386DOI: 10.1021/acs.langmuir.9b00735ISI: 000474478700032PubMedID: 31188011OAI: oai:DiVA.org:kth-255386DiVA, id: diva2:1340370
Note

QC 20190805

Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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Piela, Katarzyna

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