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Author

Sergei Gorodkin

Bio: Sergei Gorodkin is an academic researcher from University of Rochester. The author has contributed to research in topics: Magnetorheological fluid & Magnetorheological finishing. The author has an hindex of 11, co-authored 21 publications receiving 560 citations.

Papers
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Patent
03 Jun 1994
TL;DR: In this article, a method for polishing an object is described, which involves creating a polishing zone (10) within a magnetorheological fluid (2), determining the characteristics of the contact between the object and the polishing zones necessary to polish the object, and controlling the consistency of the fluid in the zone.
Abstract: A method of polishing an object is disclosed In one embodiment, as shown in the figure, the method comprises the steps of creating a polishing zone (10) within a magnetorheological fluid (2); determining the characteristics of the contact between the object and the polishing zone necessary to polish the object (4); controlling the consistency of the fluid (2) in the polishing zone (10); bringing the object (4) into contact with the polishing zone (10) of the fluid (2); and moving at least one of said object (4) and said fluid (2) with respect to the other Also disclosed is a polishing device (1) In one embodiment, the device comprises a magnetorheological fluid (2), a means (6) for inducing a magnetic field, and a means for displacing the object (4) to be polished or the means (6) for inducing a magnetic field relative to one another

105 citations

Journal ArticleDOI
TL;DR: A load for surface indentation by abrasive particles is provided at their interaction near the wall with heavier basic (magnetic) particles, which fluctuate (due to collision) in the shear flow of concentrated suspension.
Abstract: A concept of material removal based on the principle of conservation of particles momentum in a binary suspension is applied to analyze material removal in magnetorheological finishing and magnetorheological jet processes widely used in precision optics fabrication. According to this concept, a load for surface indentation by abrasive particles is provided at their interaction near the wall with heavier basic (magnetic) particles, which fluctuate (due to collision) in the shear flow of concentrated suspension. The model is in good qualitative and quantitative agreement with experimental results.

102 citations

Patent
05 Nov 1993
TL;DR: A magnetoconducting body with a magnetic core that houses an induction coil winding and a hydraulic channel located outside of the core and the inside of the body connected to a fluid inlet port (6) and an outlet port (7) is described in this paper.
Abstract: A valve used to control the flow of fluid of a mangetorheological fluid, in which the mechanical properties of the magnetorheological fluid are varied by applying a magnet (1, 2, 3), is described The valve can comprise a magnetoconducting body (1) with a magnetic core that houses an induction coil winding (2), and a hydraulic channel located outside of the core (3) and the inside of the body connected to a fluid inlet port (6) and an outlet port (7), in which magnetorheological fluid flows from the inlet port (6) through the hydraulic line (5) to the outlet port (7) Devices employing magnetorheological valves are also described

69 citations

Patent
02 Mar 2010
TL;DR: An integrated fluid management module (IFMM) provides dynamic control of the rheological fluid properties of the MR fluid on a conventional MR finishing apparatus, and dispensing of the fluid to the wheel.
Abstract: A system for magnetorheological finishing of a substrate. An integrated fluid management module (IFMM) provides dynamic control of the rheological fluid properties of the MR fluid on a conventional MR finishing apparatus, and dispensing of the fluid to the wheel. A magnetically shielded chamber charged with MR fluid is in contact with the carrier wheel. A transverse line removes the spent MR fluid from the wheel as the ribbon leaves the work zone. Replenishment fluid is added to the chamber via a dripper, and preferably an electric mixer agitates MR fluid in the chamber. A grooved magnetically-shielded insert at the exit of the chamber forms a polishing ribbon on the carrier wheel as the wheel is turned. A sensor sensitive to concentration of magnetic particles provides a signal for control of MR fluid properties, particularly, water content in the MR fluid. Means is provided for cooling fluid within the chamber.

54 citations

Patent
14 Apr 1993
TL;DR: A magnetorheological fluid composition consisting of magnetosolid particles, magnetosoft particles, a stabilizer, and a carrying fluid comprising an aromatic alcohol, a vinyl ether, and an organic solvent or diluent carrier such as kerosene, in proportions sufficient to provide substantially no agglomeration or sedimentation of magnetic particles over temperatures of from about -50 to 120 °C is described in this paper.
Abstract: A magnetorheological fluid composition comprising magnetosolid particles, magnetosoft particles, a stabilizer, and a carrying fluid comprising an aromatic alcohol, a vinyl ether, and an organic solvent or diluent carrier such as kerosene, in proportions sufficient to provide substantially no agglomeration or sedimentation of magnetic particles over temperatures of from about -50 to 120 °C. The composition can be made by preparing a carrying fluid comprising a vinyl ether, an aromatic alcohol and kerosene; preparing a first carrying fluid composition comprising magnetosoft particles, a stabilizer and a first sample of the carrying fluid; preparing a second carrying fluid composition comprising magnetosolid particles and a second sample of the carrying fluid; and admixing the first carrying fluid composition and the second carrying fluid composition.

45 citations


Cited by
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Patent
07 Jul 2005
TL;DR: An assembly that contains a medical device and biological material within which the medical device is disposed is defined in this paper, where the assembly has a direct or alternating current magnetic susceptibility within the range of from about plus 1 x 10-2 centimeter-grams to about minus 1x 10- 2 centimetergrams.
Abstract: An assembly that contains a medical device and biological material within which the medical device is disposed. The assembly has a direct or alternating current magnetic susceptibility within the range of from about plus 1 x 10-2 centimeter-gram-seconds to about minus 1 x 10-2 centimeter-gram-seconds.

752 citations

Patent
25 Feb 2004
TL;DR: In this paper, the authors describe a shielded medical device implanted in a biological organism, which has a magnetic shield, and the magnetic shield contains a layer of nanomagnetic material; such layer has a morphological density of at least 98 percent; it is bonded to the medical device by means of an interlayer with a thickness of less than about 10 microns.
Abstract: A shielded medical device implanted in a biological organism. The device has a magnetic shield, and the magnetic shield contains a layer of nanomagnetic material; such layer has a morphological density of at least 98 percent; and it is bonded to the medical device by means of an interlayer with a thickness of less than about 10 microns. The nanomagnetic material in such layer has a saturation magnetization of from about 1 to about 36,000 Gauss, a coercive force of from about 0.01 to about 5,000 Oersteds, a relative magnetic permeability of from about 1 to about 500,000, and an average particle size of less than about 100 nanometers.

687 citations

Journal ArticleDOI
TL;DR: In this article, preparation methods and magnetorheological properties of various magnetic composites with soft magnetic particles and polymers are reviewed, and some industrial applications, such as a MR dampers and a MR polishing, are briefly summarized.
Abstract: As one of the most important field-responsive intelligent and smart soft matter materials, magnetorheological (MR) fluids, consisting of magneto-responsive magnetizable particles suspended in non-magnetic fluids, have drawn a lot of attentions in both academia and industry as their physical and rheological characteristics can be controlled with external magnetic field strength. In this highlight, preparation methods and MR properties of various magnetic composites with soft magnetic particles and polymers are reviewed. In addition, some industrial applications, such as a MR dampers and a MR polishing, are briefly summarized.

397 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive review on different methods of preparation and stabilization of magnetorheological fluids is presented, and rheological models and application of MR fluids are discussed briefly in this study.

340 citations

Patent
07 Oct 2005
TL;DR: In this paper, a process for treating cells within a biological organism in which sonic energy is focused on cells within an organism while the frequency and/or the power level of such energy is varied is described.
Abstract: A process for treating cells within a biological organism in which sonic energy is focused on cells within a biological organism while the frequency and/or the power level of such energy is varied. In addition there is provided a process for synergistically combining sonic energy and other forms of energy, or other therapeutic agents, in the treatment of cells in living organisms. Furthermore there is provided a process for assaying the efficacy of other therapeutic agents with sonic energy.

281 citations