STED nanoscopy : A novel way to image the pore space of geological materials

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http://hdl.handle.net/10138/333464

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Hellmuth , K-H , Sammaljarvi , J , Siitari-Kauppi , M , Robinet , J-C & Sardini , P 2021 , ' STED nanoscopy : A novel way to image the pore space of geological materials ' , Journal of Microscopy , vol. 283 , no. 2 , pp. 151-165 . https://doi.org/10.1111/jmi.13016

Title: STED nanoscopy : A novel way to image the pore space of geological materials
Author: Hellmuth, Karl-Heinz; Sammaljarvi, Juuso; Siitari-Kauppi, Marja; Robinet, Jean-Charles; Sardini, Paul
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2021-08
Language: eng
Number of pages: 15
Belongs to series: Journal of Microscopy
ISSN: 0022-2720
URI: http://hdl.handle.net/10138/333464
Abstract: STED nanoscopy (Stimulated Emission Depletion). which can resolve details far below the diffraction barrier has been applied hitherto preferentially to life sciences. The method is however also ideal for the investigation of geological matrices containing transparent minerals, an application tested here, to our knowledge, for the first time. The measurements on altered granitic rock and sedimentary clay rock, both containing very fine-grained phases, were conducted successfully. The STED fluorophore was dissolved in C-14-labelled methylmethacrylate (C-14-MMA) monomer which was polymerised within the rock matrix, thereby labelling the pore space in the geomaterials. Double labelling provided by the C-14-labelled MMA enables autoradiography and scanning electron microscopy (SEM), providing necessary complementary information for characterisation and quantification of porosity distributions and mineral and structure identification. Promising perspectives for further investigations of geological matrices by using different fluorophores and the optimisation of measuring procedures or even higher resolution are discussed. The combination of these different methods enlarges the observation scale of porosity from nanometre to centimetre scale.
Subject: 116 Chemical sciences
autoradiography
crystalline rock
electron microscopy
porosity
sedimentary rock
STED nanoscopy
FLUORESCENCE MICROSCOPY
STIMULATED-EMISSION
GRANITIC-ROCKS
LASER ACTION
POROSITY
RESOLUTION
MATRIX
IMPREGNATION
TOMOGRAPHY
DIFFUSION
1171 Geosciences
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