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US 2002/0120105 A1Published application
Polarization switching to control crystal form
OwnerAllan S. Myerson, Bruce A. Garetzinventors
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Abstract
A method to select and prepare polymorphs of materials by switching the polarization state of light employing non-photochemical laser-induced nucleation.
Claims45
A method of preparing a crystal polymorph, comprising the steps of:
- a. preparing a supersaturated solution of a known substance;
- b. selecting a polarization state of light to induce the onset of nucleation of crystals of the polymorph of the known substance from the supersaturated solution;
- and
- c. subjecting the supersaturated solution to the light for a period of time so as to induce the onset of nucleation of the crystals of the polymorph.
1 more element
A method of preparing a crystal polymorph, comprising the steps of:
- a. preparing a supersaturated solution of a known substance;
- b. aging the supersaturated solution for a period of 1 hour to 200 hours;
- c. subjecting the supersaturated solution to the light from a near-infrared laser emitting light at a selected polarization state for a period of time so as to induce the onset of nucleation of the crystals of the polymorph.
A method of preparing a crystal polymorph from a known substance, comprising the steps of:
- a. preparing a supersaturated solution of the known substance;
- b. aging the supersaturated solution for a period of 1 hour to 200 hours;
- c. selecting a polarization state of laser light to induce the onset of nucleation of crystals of the crystal polymorph of the known substance from the supersaturated solution, wherein the light is at most minimally absorbed by the supersaturated solution;
- and
- d. subjecting the supersaturated solution to the laser light for between 0.01 second and 1 hour so as to induce the onset of nucleation of the crystals of the polymorph.
2 more elements
Dependencies are inferred from the claim text.