DOI: 10.1002/2015GL064365
论文题名: Repulsive hydration forces between calcite surfaces and their effect on the brittle strength of calcite-bearing rocks
作者: Røyne A. ; Dalby K.N. ; Hassenkam T.
刊名: Geophysical Research Letters
ISSN: 0094-8674
EISSN: 1944-8405
出版年: 2015
卷: 42, 期: 12 起始页码: 4786
结束页码: 4794
语种: 英语
英文关键词: adhesion
; AFM
; calcite
; fractures
; grain boundaries
; surface forces
Scopus关键词: Adhesion
; Atomic force microscopy
; Bearings (machine parts)
; Fracture
; Grain boundaries
; Hydration
; AFM
; Brittle strength
; Calcite crystals
; Hydration repulsions
; Nano-meter scale
; Presence of water
; Surface forces
; Water-glycol mixtures
; Calcite
; adhesion
; atomic force microscopy
; brittle medium
; calcite
; fracture geometry
; grain size
; hydration
; rock mechanics
; strength
英文摘要: The long-term mechanical strength of calcite-bearing rocks is highly dependent on the presence and nature of pore fluids, and it has been suggested that the observed effects are due to changes in nanometer-scale surface forces near fracture tips and grain contacts. In this letter, we present measurements of forces between two calcite surfaces in air and water-glycol mixtures using the atomic force microscope. We show a time- and load-dependent adhesion at low water concentrations and a strong repulsion in the presence of water, which is most likely due to hydration of the strongly hydrophilic calcite surfaces. We argue that this hydration repulsion can explain the commonly observed water-induced decrease in strength in calcitic rocks and single calcite crystals. Furthermore, this relatively simple experimental setup may serve as a useful tool for analyzing surface forces in other mineral-fluid combinations. © 2015. AmericanGeophysicalUnion. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84947039542&doi=10.1002%2f2015GL064365&partnerID=40&md5=7835e242e812ae403e257eebd9882104
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8290
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Physics of Geological Processes, Department of Physics, University of Oslo, Oslo, Norway
Recommended Citation:
Røyne A.,Dalby K.N.,Hassenkam T.. Repulsive hydration forces between calcite surfaces and their effect on the brittle strength of calcite-bearing rocks[J]. Geophysical Research Letters,2015-01-01,42(12).