SYSTEM AND METHOD FOR ENHANCED ELECTROSTATIC DEPOSITION AND SURFACE COATINGS
First Claim
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1. A system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of said substrate, the system comprising:
- an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; and
an auxiliary emitter that generates a stream of charged ions having a second average potential in an inert carrier gas;
whereby said coating particles interact with said charged ions and said carrier gas to enhance a charge differential between said coating particles and said substrate.
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Abstract
This disclosure describes the application of a supplemental corona source to provide surface charge on submicrometer particles to enhance collection efficiency and micro-structural density during electrostatic collection.
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Citations
68 Claims
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1. A system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of said substrate, the system comprising:
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an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average potential in an inert carrier gas; whereby said coating particles interact with said charged ions and said carrier gas to enhance a charge differential between said coating particles and said substrate. - View Dependent Claims (3, 4, 5, 6, 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, 68)
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2. A system for electrostatic deposition of particles upon a charged substrate to form a coating on a surface of a substrate, the system comprising:
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an expansion nozzle that releases coating particles having a first average electric potential suspended in a gaseous phase from a near-critical or supercritical fluid that is expanded through said nozzle; and an auxiliary emitter that generates a stream of charged ions having a second average electric potential in an inert carrier gas; whereby said coating particles interact with said charged ions and said carrier gas to enhance a potential differential between said coating particles and said substrate.
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- 7. The system of any of claims I and 2, wherein said auxiliary emitter comprises an electrode having a tapered end that extends into a gas channel that conducts said stream of charged ions in said inert carrier gas toward said charged coating particles.
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34. A method for forming a coating on a surface of a substrate, comprising:
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establishing an electric field between said substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting said coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the charge differential between said coating particles and said substrate. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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35. A method for coating a surface of a substrate with a preselected material forming a coating, comprising the steps of:
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establishing an electric field between said substrate and a counter electrode; producing coating particles suspended in a gaseous phase of an expanded near-critical or supercritical fluid having an first average electric potential; and contacting said coating particles with a stream of charged ions at a second average potential in an inert carrier gas to increase the potential differential between said coating particles and said substrate.
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Specification