Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules
The surface heterogeneity of a hydrophilic calcium carbonate (calcite) at the solid-gas interface was studied before and after modification by the adsorption of different amounts of a water-repellent molecule (WRM). The surface heterogeneity was analysed using nitrogen, argon and water as molecular...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2007-10-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.25.8.561 |
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| author | F. Villiéras M. Chamerois J. Yvon J.M. Cases |
| author_facet | F. Villiéras M. Chamerois J. Yvon J.M. Cases |
| author_sort | F. Villiéras |
| collection | DOAJ |
| description | The surface heterogeneity of a hydrophilic calcium carbonate (calcite) at the solid-gas interface was studied before and after modification by the adsorption of different amounts of a water-repellent molecule (WRM). The surface heterogeneity was analysed using nitrogen, argon and water as molecular probes. Low-pressure adsorption techniques coupled with derivative isotherm summation (DIS) analysis of the experimental curves gave quantitative information on the decrease in the calcite surfaces and the increase in the WRM surfaces. The modelling results enabled the monolayer capacity for WRMs as measured by argon adsorption to be correlated with the disappearance of calcite surfaces and the disappearance of high-energy adsorption sites as measured by nitrogen adsorption. In addition, the argon results suggested that WRMs first adsorb on argon low-energy carbonate faces and then on low- and high-energy faces. With water, the adsorption energy distribution remained unchanged in shape, indicating that this molecule can diffuse into the adsorbed layer between and around the adsorbed hydrophilic heads of the WRMs and thereby interact directly with the carbonate surface. |
| format | Article |
| id | doaj-art-e280a527129f47ff893ef099ec73d81b |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2007-10-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-e280a527129f47ff893ef099ec73d81b2025-02-03T10:07:42ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382007-10-012510.1260/0263-6174.25.8.561Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent MoleculesF. VilliérasM. ChameroisJ. YvonJ.M. CasesThe surface heterogeneity of a hydrophilic calcium carbonate (calcite) at the solid-gas interface was studied before and after modification by the adsorption of different amounts of a water-repellent molecule (WRM). The surface heterogeneity was analysed using nitrogen, argon and water as molecular probes. Low-pressure adsorption techniques coupled with derivative isotherm summation (DIS) analysis of the experimental curves gave quantitative information on the decrease in the calcite surfaces and the increase in the WRM surfaces. The modelling results enabled the monolayer capacity for WRMs as measured by argon adsorption to be correlated with the disappearance of calcite surfaces and the disappearance of high-energy adsorption sites as measured by nitrogen adsorption. In addition, the argon results suggested that WRMs first adsorb on argon low-energy carbonate faces and then on low- and high-energy faces. With water, the adsorption energy distribution remained unchanged in shape, indicating that this molecule can diffuse into the adsorbed layer between and around the adsorbed hydrophilic heads of the WRMs and thereby interact directly with the carbonate surface.https://doi.org/10.1260/0263-6174.25.8.561 |
| spellingShingle | F. Villiéras M. Chamerois J. Yvon J.M. Cases Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules Adsorption Science & Technology |
| title | Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules |
| title_full | Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules |
| title_fullStr | Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules |
| title_full_unstemmed | Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules |
| title_short | Surface Heterogeneity at the Solid-Gas Interface of Hydrophilic Solids Modified by Water-Repellent Molecules |
| title_sort | surface heterogeneity at the solid gas interface of hydrophilic solids modified by water repellent molecules |
| url | https://doi.org/10.1260/0263-6174.25.8.561 |
| work_keys_str_mv | AT fvillieras surfaceheterogeneityatthesolidgasinterfaceofhydrophilicsolidsmodifiedbywaterrepellentmolecules AT mchamerois surfaceheterogeneityatthesolidgasinterfaceofhydrophilicsolidsmodifiedbywaterrepellentmolecules AT jyvon surfaceheterogeneityatthesolidgasinterfaceofhydrophilicsolidsmodifiedbywaterrepellentmolecules AT jmcases surfaceheterogeneityatthesolidgasinterfaceofhydrophilicsolidsmodifiedbywaterrepellentmolecules |