Molecularly-imprinted material made by template-directed synthesis

• US 6,660,780 B2
• Filed: 11/27/2002
• Issued: 12/09/2003
• Est. Priority Date: 07/30/1999
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Dordick, Jonathan S., Turner, David C., Clark, Douglas S., Markowitz, Michael A., Ratna, Banahalli R., Schoen, Paul E., Gaber, Bruce P., Kust, Paul R.
• Primary Examiner(s): Nutter, Nathan M.
• Application Number:
  US10/307,536
• Publication Number:
  US 20030191205A1
• Time in Patent Office: 377 Days
• Field of Search: 521/99, 521/100, 521/102, 521/106, 521/107, 521/108, 521/109.1, 521/110, 521/111, 521/117, 521/120, 521/121, 521/128, 521/131, 521/154, 436/518, 436/524, 436/527, 436/531, 436/8, 501/12, 501/32, 501/80, 516/98, 516/99, 252/408.1, 210/656, 210/660, 210/661, 210/663
• US Class Current: 521/99
• CPC Class Codes: B01J 37/00 Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 37/02 Crystalline silica-polymorphs, e.g. silicalites dealuminated aluminosilicate zeolites
• CPC Class Codes: C01P 2004/52 highly monodisperse size distribution
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/16 Pore diameter
• CPC Class Codes: C09C 1/3081 Treatment with organo-silicon compounds
• CPC Class Codes: Y10T 436/10 Composition for standardization, calibration, simulation, stabilization, preparation or preservation; processes of use in preparation for chemical testing

Abstract

A method of making a molecularly imprinted porous structure makes use of a surfactant analog of the molecule to be imprinted that has the imprint molecule portion serving as the surfactant headgroup. The surfactant analog is allowed to self-assemble in a mixture to create at least one supramolecular structure having exposed imprint groups. The imprinted porous structure is formed by adding reactive monomers to the mixture and allowing the monomers to polymerize, with the supramolecular structure serving as a template. The resulting solid structure has a shape that is complementary to the shape of the supramolecular structure and has cavities that are the mirror image of the imprint group. Similarly, molecularly imprinted particles may be made by using the surfactant to create a water-in-oil microemulsion wherein the imprint groups are exposed to the water phase. When reactive monomers are allowed to polymerize in the water phase to form particles, the surface of the particles have cavities that are the mirror image of the imprint group.

Claims

1. A molecularly imprinted solid structure made by a method comprising the steps of

(a) providing a surfactant compound having a headgroup portion, wherein the headgroup portion comprises an imprint group,

(b) combining the surfactant compound, a solvent and at least one reactive monomer to form a mixture and maintaining the mixture so that molecules of the surfactant compound self-assemble to form at least one supramolecular structure having a surface wherein the imprint groups are exposed on the surface and so that the supramolecular structure serves as a template wherein the molecules of the reactive monomer self-organize along the surface of the supramolecular structure and around the exposed imprint groups,

(c) maintaining the mixture from step (b) so that the reactive monomers react with each other to form a solid structure having a surface topography complementary to the surface topography of the supramolecular structure having indentations complementary to the shape of the exposed imprint groups, and

(d) removing the supramolecular structure from the solid structure.

2. The molecularly imprinted solid structure of claim 1 wherein the surfactant compound is a compound that is made by the steps of:

providing a hydrophilic imprint compound; and

acylating the hydrophilic imprint compound to create an amphiphilic surfactant compound.

3. The molecularly imprinted solid structure of claim 1 wherein the mixture of step (b) includes at least one additional surfactant.

4. The molecularly imprinted solid structure of claim 1 wherein the reactive monomer is an organic polymer precursor.

5. The molecularly imprinted solid structure of claim 1 wherein the reactive monomer is selected from the group consisting of acrylate, methyl methacrylate, olefins, pyrrole, saccharides, silanes, styrene, isocyanates, vinyl acetate, vinyl chloride and combinations thereof.

6. The molecularly imprinted solid structure of claim 1 wherein the reactive monomer is an inorganic oxide precursor.

7. The molecularly imprinted solid structure of claim 1 wherein the reactive monomer is an alkoxysilane.

8. The molecularly imprinted solid structure of claim 1 wherein the reactive monomer is selected from the group consisting of tetraethoxysilane, tetramethoxysilane, tetrabutoxysilane, tetramethoxygermane, tetraisopropoxygermane, tetraethoxygermane, tetrabutoxygermane, aluminum n-butoxide, aluminum isoproxide, titanium ethoxide, titanium diisopropoxide (bis-2,4-pentanedionate), titanium methyl phenoxide, vanadium triisopropoxide oxide, vanadium tri-n-propoxide, zirconium n-butoxide, zirconium n-propoxide and combinations thereof.

9. The molecularly imprinted solid structure of claim 1 wherein the mixture of step (b) includes a non-functionalized reactive monomer and at least one reactive monomer having a functional moiety selected from the group consisting of primary amines, secondary amines, tertiary amines, quaternary amines, hydroxyl, carboxylate, sulfhydryl, amino acids, metal chelates, ureido, urea, thiourea, amidine, methyl, phenyl, fluorocarbons, nucleotides, phosphonucleotides, phosphates, saccharides and combinations thereof.