Porous inorganic/organic hybrid particles for chromatographic separations and process for its preparation
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Abstract
Novel material for chromatographic separations, processes for its preparation, and separations devices containing the chromatographic material. In particular, the disclosure describes porous inorganic/organic hybrid particles having a chromatographically-enhancing pore geometry, which desirably may be surface modified, and that offer more efficient chromatographic separations than that known in the art.
110 Citations
146 Claims
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1-33. -33. (canceled)
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34. A method of preparation of porous inorganic/organic hybrid particles having a chromatographically-enhancing pore geometry, comprising the steps of
a) forming porous inorganic/organic hybrid particles, b) modifying the pore structure of said porous particles.
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36-40. -40. (canceled)
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47. (canceled)
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50. A method of preparation of porous inorganic/organic hybrid particles having a chromatographically-enhancing pore geometry, comprising the steps of
a) forming porous inorganic/organic hybrid particles, b) modifying the pore structure of said porous particles, and c) surface modifying said particles, wherein said surface modification step includes surface modifying said porous particles with a surface modifier having the formula Za(R′ - )bSi—
R, where Z=Cl, Br, I, C1-C5 alkoxy, dialkylamino or trifluoromethanesulfonate;
a and b are each an integer from 0 to 3 provided that a+b=3;
R′
is a C1-C6 straight, cyclic or branched alkyl group, and R is a functionalizing group.
- )bSi—
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51-64. -64. (canceled)
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87-110. -110. (canceled)
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111. A method of preparation of porous particles of hybrid silica having a chromatographically-enhancing pore geometry, comprising the steps of
a) prepolymerizing a mixture of one or more organoalkoxysilanes and a tetraalkoxysilane in the presence of an acid catalyst to produce a polyorganoalkoxysiloxane; -
b) preparing an aqueous suspension of said polyorganoalkoxysiloxane, said suspension further comprising a surfactant or combination of surfactants, and gelling in the presence of a base catalyst so as to produce porous particles; and
a) modifying the pore structure of said porous particles by hydrothermal treatment, thereby preparing porous particles of hybrid silica having a chromatographically-enhancing pore geometry. - View Dependent Claims (112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128)
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129. Porous particles of hybrid silica having a chromatographically-enhancing pore geometry, produced by the process of
a) prepolymerizing a mixture of one or more organoalkoxysilanes and a tetraalkoxysilane in the presence of an acid catalyst to produce a polyalkyloxysiloxane; -
b) preparing an aqueous suspension of said polyalkyloxysiloxane, said suspension further comprising a surfactant or a combination of surfactants, and gelling in the presence of a base catalyst so as to produce porous particles; and
c) modifying the pore structure of said porous particles by hydrothermal treatment, thereby producing porous particles of hybrid silica having a chromatographically-enhancing pore geometry. - View Dependent Claims (130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146)
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Specification