Preparation of Hydrophobic Metal Oxides by Dry Coupling Treatment Method Using Alkyltrimethoxysilane Agents
Oligomer formation reactions during the preliminary treatment of a solution system consisting of ATMS-EtOH-H2O, and the hydrophobic treatment of TiO2, Ti-Fe-Al composite oxide and α-Fe2O3, which have different numbers of surface OH groups, using various preliminarily treated alkyltrimethoxysilane (A...
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Published in | Hyōmen gijutsu Vol. 55; no. 3; pp. 186 - 191 |
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Main Authors | , , , |
Format | Journal Article |
Language | Japanese English |
Published |
Tokyo
The Surface Finishing Society of Japan
2004
Hyomen Gijutsu Kyokai Japan Science and Technology Agency |
Subjects | |
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Abstract | Oligomer formation reactions during the preliminary treatment of a solution system consisting of ATMS-EtOH-H2O, and the hydrophobic treatment of TiO2, Ti-Fe-Al composite oxide and α-Fe2O3, which have different numbers of surface OH groups, using various preliminarily treated alkyltrimethoxysilane (ATMS) solutions, were investigated. The main findings were as follows: (1) The maximum M value, which is a parameter of the hydrophobic degree, for the metal oxides investigated showed a tendency to increase with the increase in the carbon number of the alkyl groups composing ATMS. The maximum M values of Ti-Fe-Al composite oxide and TiO2 appeared to be almost the same, whereas those of α-Fe2O3 were 10~20% smaller. The M values obtained with i-BTMS were lower than those with n-BTMS, despite the identities of the oxide tested. (2) There is an intimate relationship between the oligomer states in preliminarily treated solution and the maximum M values obtained for all metal oxides tested. (3) Although the hydrophobic treatment was performed using a theoretical amount of preliminarily treated ATMS, the maximum M values for all metal oxides tested increased with the increase in the number of OH groups on the substrate surface. |
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AbstractList | Oligomer formation reactions during the preliminary treatment of a solution system consisting of ATMS-EtOH-H2O, and the hydrophobic treatment of TiO2, Ti-Fe-Al composite oxide and α-Fe2O3, which have different numbers of surface OH groups, using various preliminarily treated alkyltrimethoxysilane (ATMS) solutions, were investigated. The main findings were as follows: (1) The maximum M value, which is a parameter of the hydrophobic degree, for the metal oxides investigated showed a tendency to increase with the increase in the carbon number of the alkyl groups composing ATMS. The maximum M values of Ti-Fe-Al composite oxide and TiO2 appeared to be almost the same, whereas those of α-Fe2O3 were 10~20% smaller. The M values obtained with i-BTMS were lower than those with n-BTMS, despite the identities of the oxide tested. (2) There is an intimate relationship between the oligomer states in preliminarily treated solution and the maximum M values obtained for all metal oxides tested. (3) Although the hydrophobic treatment was performed using a theoretical amount of preliminarily treated ATMS, the maximum M values for all metal oxides tested increased with the increase in the number of OH groups on the substrate surface. |
Author | MIYANO, Masahide SANUKI, Sumiko MAJIMA, Hiroshi YOSHINAGA, Toshihiro |
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SubjectTerms | Alkyltrimethoxysilane Coupling Treatment Hydrophobic Powder Oligomer Formation Ti-Fe-Al Composite Oxide TiO2 α-Fe2O3 |
Title | Preparation of Hydrophobic Metal Oxides by Dry Coupling Treatment Method Using Alkyltrimethoxysilane Agents |
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