Fluoroalkylsilanated mesoporous metal oxide particles and methods of preparation thereof
First Claim
1. A treated aggregate, comprising:
- a) an inorganic oxide substrate having the formula SiOx, wherein the inorganic oxide substrate possesses a specific surface area of at least 50 square meters per gram;
b) a molecular layer coating of —
CF3 terminated molecular fragments, wherein the —
CF3 terminated molecular fragments are covalently bonded to the inorganic oxide substrate such that at least 15 parts by weight of fluorine in the form of —
CF—
, —
CF2—
, or —
CF3 fragments is covalently bound to 100 parts by weight of the inorganic oxide substrate,wherein the treated aggregate comprises a geometric shape that is determined by the inorganic oxide substrate and the molecular layer coating, the geometric shape being characterized by an occurrence of concave features of multiple sizes spanning a range from about 5 nm to about 0.001 mm.
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Abstract
Coated particles comprise a core of fumed or precipitated inorganic metal oxide having a surface area of about 50 to about 500 square meters per gram and a shell consisting of an array of fluoroalkyl molecular chains at a density of at least 1 chain per square nanometer, joined to the core by covalent chemical bonds and with a total organic content of at least 9.9 percent by weight. These particles are formed by the chemical attachment of fluoroalkyl-alkylsilanes after exposure to an alkylamine and followed by an extraction to remove any organic material not covalently bound. The dense packing of molecular chains in the fluoroalkyl shell combined with a mesoporous structure imparts a very low surface energy, a very high specific surface area, and surface texture over a wide range of length scales. Such features are highly desirable for the creation of, for example, superhydrophobic and superoleophobic surfaces, separation media, and release films.
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Citations
7 Claims
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1. A treated aggregate, comprising:
-
a) an inorganic oxide substrate having the formula SiOx, wherein the inorganic oxide substrate possesses a specific surface area of at least 50 square meters per gram; b) a molecular layer coating of —
CF3 terminated molecular fragments, wherein the —
CF3 terminated molecular fragments are covalently bonded to the inorganic oxide substrate such that at least 15 parts by weight of fluorine in the form of —
CF—
, —
CF2—
, or —
CF3 fragments is covalently bound to 100 parts by weight of the inorganic oxide substrate,wherein the treated aggregate comprises a geometric shape that is determined by the inorganic oxide substrate and the molecular layer coating, the geometric shape being characterized by an occurrence of concave features of multiple sizes spanning a range from about 5 nm to about 0.001 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification