TY - JOUR
T1 - Specific Surface Area by Colorimetry and Image Analysis
AU - Salva Ramirez, Marisol
AU - Santamarina, Carlos
N1 - KAUST Repository Item: Exported on 2022-06-15
Acknowledgements: Support for this research was provided by the KAUST Endowment at King Abdullah University of Science and Technology.
PY - 2021/9/21
Y1 - 2021/9/21
N2 - Specific surface area is more informative than grain size for fine-grained sediments where Ss > 1 m2/g. In fact, specific surface area plays a central role in engineering properties and processes in fine-grained soils, including pore size and bioactivity; fabric, plasticity, and rheology; hydraulic and electrical conductivity; compressibility and residual friction angle; and all forms of coupled processes. This research advanced a dye adsorption method using digital image colorimetry implemented with smartphone technology. In particular, this research adopted a water-based approach to reach internal surfaces in platy phyllosilicates, selected short dye molecules to reduce the range of potential molecular contact area, and developed a physics-based adsorption model to analyze the complete data set to minimize the uncertainty in specific surface area determinations. The study involved fine-grained soils with distinct mineralogy and specific surface area (from 1 to 600 m2/g) and various cationic dyes and a protein to explore the effect of molecular size, shape, and pH. Crystal violet emerged as a reliable dye for soil characterization. Time-dependent measurements confirmed second-order kinetics and highlight the importance of adsorption time.
AB - Specific surface area is more informative than grain size for fine-grained sediments where Ss > 1 m2/g. In fact, specific surface area plays a central role in engineering properties and processes in fine-grained soils, including pore size and bioactivity; fabric, plasticity, and rheology; hydraulic and electrical conductivity; compressibility and residual friction angle; and all forms of coupled processes. This research advanced a dye adsorption method using digital image colorimetry implemented with smartphone technology. In particular, this research adopted a water-based approach to reach internal surfaces in platy phyllosilicates, selected short dye molecules to reduce the range of potential molecular contact area, and developed a physics-based adsorption model to analyze the complete data set to minimize the uncertainty in specific surface area determinations. The study involved fine-grained soils with distinct mineralogy and specific surface area (from 1 to 600 m2/g) and various cationic dyes and a protein to explore the effect of molecular size, shape, and pH. Crystal violet emerged as a reliable dye for soil characterization. Time-dependent measurements confirmed second-order kinetics and highlight the importance of adsorption time.
UR - http://hdl.handle.net/10754/679051
UR - http://www.astm.org/doiLink.cgi?GTJ20210026
UR - http://www.scopus.com/inward/record.url?scp=85115822719&partnerID=8YFLogxK
U2 - 10.1520/gtj20210026
DO - 10.1520/gtj20210026
M3 - Article
SN - 0149-6115
VL - 45
SP - 20210026
JO - Geotechnical Testing Journal
JF - Geotechnical Testing Journal
IS - 1
ER -