Coatings with controlled porosity and chemical properties
First Claim
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1. A coating for providing selectivity among different chemical species, the coating comprising:
- pores having a predetermined uniform pore size, said predetermined uniform pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and said predetermined uniform pore size sufficient to allow analyte species of smaller size than said pores to enter said pores; and
means for chemically sorbing at least a portion of the analyte species having a smaller size than said pores;
wherein said coating comprises at least one member selected from the group consisting of silicate films, titanate films, zirconate films, alumina films, and hydrous oxide films.
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Abstract
Coatings and sensors having both steric and chemical selectivity. Controlled porosity provides the steric selectivity, whereas chemically tailored film properties, using controlled composition or modification by coupling agents, chemical species replacement, or chemical species within pores, provide the chemical selectivity. Single or multiple layers may be provided.
90 Citations
39 Claims
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1. A coating for providing selectivity among different chemical species, the coating comprising:
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pores having a predetermined uniform pore size, said predetermined uniform pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and said predetermined uniform pore size sufficient to allow analyte species of smaller size than said pores to enter said pores; and means for chemically sorbing at least a portion of the analyte species having a smaller size than said pores; wherein said coating comprises at least one member selected from the group consisting of silicate films, titanate films, zirconate films, alumina films, and hydrous oxide films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A coating for providing selectivity among different chemical species, the coating comprising:
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pores having a predetermined uniform pore size, said predetermined uniform pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and said predetermined uniform pore size sufficient to allow analyte species of smaller size than said pores to enter said pores; means for chemically sorbing at least a portion of the analyte species having a smaller size than said pores, said means for chemically sorbing the analyte species comprising chemically reactive species adjacent the coating and seated within said pores; and wherein said chemically reactive species seated within said pores comprise polyoxometalate species. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method of making a coating for providing selectivity among different chemical species, the method comprising the steps of:
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a) forming a coating with a predetermined uniform pore size, the predetermined pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and the predetermined uniform pore size sufficient to allow analyte species of smaller size than the pores to enter the pores; and b) providing means for chemically sorbing at least a portion of the analyte species having a smaller size than the pores; wherein the step of forming a coating with a predetermined uniform pore size comprises forming at least one film selected from the group consisting of silicate films, titanate films, zirconate films, alumina films, and hydrous oxide films. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method of making a coating for providing selectivity among different chemical species, the method comprising the steps of:
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a) forming a coating with a predetermined uniform pore size, the predetermined pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and the predetermined uniform pore size sufficient to allow analyte species of smaller size than the pores to enter the pores; and b) providing means for chemically sorbing at least a portion of the analyte species having a smaller size than the pores; wherein the step of forming a coating further comprises the step of replacing a portion of surface molecules in the coating with aluminum as the chemically reactive species, the chemically reactive species reactive to the analyte to be sorbed within the pores; and wherein the step of replacing a portion of surface molecules in the coating with aluminum comprises using trimethylaluminum to replace surface molecules with aluminum.
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39. A method of making a coating for providing selectivity among different chemical species, the method comprising the steps of:
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a) forming a coating with a predetermined uniform pore size, the predetermined pore size sufficient to prevent analyte species of larger size than said pores from entering said pores and the predetermined uniform pore size sufficient to allow analyte species of smaller size than the pores to enter the pores; and b) providing means for chemically sorbing at least a portion of the analyte species having a smaller size than the pores; wherein the step of providing means for chemically sorbing the analyte species comprises providing a polyoxometalate species as a chemically reactive species adjacent the coating and seated within the pores.
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Specification