Nanocomposites and their application as monolith columns
First Claim
1. A hybrid inorganic/organic monolith utilized in chromatographic separation comprising a polymerized scaffolding nanocomposite (PSN), wherein the nanocomposite contains a scaffolding functionality which chemically interacts with an anchoring functionality on an internal surface of a chromatographic device;
- and wherein the hybrid inorganic/organic monolith is prepared by a method comprising the steps ofa) forming a sol-gel by the reaction of two or more monomers within the chromatographic device;
b) initiating a polymerization reaction; and
c) allowing the monomers to react through a polymerization sol-gel (PSG) reaction, thereby preparing the hybrid inorganic/organic monolith;
whereinthe pore structure of said hybrid inorganic/organic monolith is modified by including a surfactant or combination of different surfactants in said PSG reaction and wherein the surfactant is removed from the monolith structure following said PSG reaction,and wherein the internal surface of the chromatotgraphic device is derivatized with the anchoring functionality and the monolith structure shows no optical evidence of shrinkage, as observed by optical microscope.
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Abstract
Novel materials for chromatographic separations, processes for their preparation, and separation devices containing the chromatographic materials. In particular, hybrid inorganic/organic monolith materials comprising a polymerized scaffolding nanocomposite (PSN), wherein the nanocomposite contains a scaffolding functionally capable of chemically interacting with a surface of a second material are described. The hybrid inorganic/organic materials have enhanced wall adhesion and increased resistance to shrinkage as compared to prior art monolith materials. The improved adhesion of the monoliths enable the preparation of capillary columns with an internal diameter (I.D.)≧50 μm.
20 Citations
54 Claims
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1. A hybrid inorganic/organic monolith utilized in chromatographic separation comprising a polymerized scaffolding nanocomposite (PSN), wherein the nanocomposite contains a scaffolding functionality which chemically interacts with an anchoring functionality on an internal surface of a chromatographic device;
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and wherein the hybrid inorganic/organic monolith is prepared by a method comprising the steps of a) forming a sol-gel by the reaction of two or more monomers within the chromatographic device; b) initiating a polymerization reaction; and c) allowing the monomers to react through a polymerization sol-gel (PSG) reaction, thereby preparing the hybrid inorganic/organic monolith; wherein the pore structure of said hybrid inorganic/organic monolith is modified by including a surfactant or combination of different surfactants in said PSG reaction and wherein the surfactant is removed from the monolith structure following said PSG reaction, and wherein the internal surface of the chromatotgraphic device is derivatized with the anchoring functionality and the monolith structure shows no optical evidence of shrinkage, as observed by optical microscope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A method of in situ preparation of a hybrid inorganic/organic monolith in a fused-silica capillary column, said method comprising:
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forming an anchoring functionality on an interior surface of said capillary column; and forming inside said capillary column a hybrid inorganic/organic monolith comprising a polymerized scaffolding nanocomposite (PSN), wherein the nanocomposite contains a scaffolding functionality capable of chemically interacting with the anchoring functionality on said surface, said monolith being formed by; a) forming a sol-gel by the reaction of two or more monomers; b) initiating a polymerization reaction; and c) allowing the monomers to react through a polymerization sol-gel (PSG) reaction; whereby said scaffolding functionality and said anchoring functionality chemically interact to thereby anchor said monolith to said surface, such that a hybrid inorganic/organic monolith is prepared in situ in the fused-silica capillary column. - View Dependent Claims (54)
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Specification