Patents by Inventor Chia-Ling Chien
Chia-Ling Chien has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9044808Abstract: A method for assembling multi-component nano-structures that includes dispersing a plurality of nano-structures in a fluid medium, and applying an electric field having an alternating current (AC) component and a direct current (DC) component to the fluid medium containing the plurality of nano-structures. The electric field causes a first nano-structure from the plurality of nano-structures to move to a predetermined position and orientation relative to a second nano-structure of the plurality of nano-structures such that the first and second nano-structures assemble into a multi-component nano-structure.Type: GrantFiled: March 3, 2010Date of Patent: June 2, 2015Assignee: The Johns Hopkins UniversityInventors: Chia-Ling Chien, Donglei Fan, Robert Charles Cammarata
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SYSTEMS AND METHODS FOR SEPARATING METALLIC AND NONMETALLIC PARTICLES IN A MIXED-PARTICLE SUSPENSION
Publication number: 20140346044Abstract: A continuous flow particle separation system for separating metallic and nonmetallic particles from a mixed-particle suspension includes a fluid channeling component defining an input channel and first and second output channels fluidly connected to the input channel at a bifurcated junction, a first electrode and a second electrode arranged proximate the input channel at least partially prior to the bifurcated junction, and an alternating current (AC) electric power source electrically connected to the first and second electrodes.Type: ApplicationFiled: May 24, 2013Publication date: November 27, 2014Applicant: The Johns Hopkins UniversityInventors: Su Chih Chi, Robert Cammarata, Stephen L. Farias, Donglei Fan, Danru Qu, Chia-Ling Chien -
SYSTEMS AND METHODS FOR SEPARATING METALLIC AND NONMETALLIC PARTICLES IN A MIXED-PARTICLE SUSPENSION
Publication number: 20140346045Abstract: A continuous flow particle separation system for separating metallic and nonmetallic particles from a mixed-particle suspension includes a fluid channeling component defining an input channel and first and second output channels fluidly connected to the input channel at a bifurcated junction, a first electrode and a second electrode arranged proximate the input channel at least partially prior to the bifurcated junction, and an alternating current (AC) electric power source electrically connected to the first and second electrodes.Type: ApplicationFiled: March 19, 2014Publication date: November 27, 2014Applicant: The Johns Hopkins UniversityInventors: Su Chih Chi, Robert Cammarata, Stephen L. Farias, Donglei Fan, Danru Qu, Chia-Ling Chien -
Publication number: 20130015542Abstract: A magneto-electronic device includes a first electrode, a second electrode spaced apart from the first electrode, and an electric-field-controllable magnetic tunnel junction arranged between the first electrode and the second electrode. The electric-field-controllable magnetic tunnel junction includes a first ferromagnetic layer, an insulating layer formed on the first ferromagnetic layer, and a second ferromagnetic layer formed on the insulating layer. The first and second ferromagnetic layers have respective first and second magnetic anisotropies that are alignable substantially parallel to each other in a first state and substantially antiparallel in a second state of the electric-field-controllable magnetic tunnel junction.Type: ApplicationFiled: July 16, 2012Publication date: January 17, 2013Applicant: The Johns Hopkins UniversityInventors: Weigang Wang, Chia-Ling Chien
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Publication number: 20120219772Abstract: A method for assembling multi-component nano-structures that includes dispersing a plurality of nano-structures in a fluid medium, and applying an electric field having an alternating current (AC) component and a direct current (DC) component to the fluid medium containing the plurality of nano-structures. The electric field causes a first nano-structure from the plurality of nano-structures to move to a predetermined position and orientation relative to a second nano-structure of the plurality of nano-structures such that the first and second nano-structures assemble into a multi-component nano-structure.Type: ApplicationFiled: March 3, 2010Publication date: August 30, 2012Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Chia-Ling Chien, Donglei Fan, Robert Charles Cammarata
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Patent number: 8228718Abstract: Featured is a magnetic ring structure including at least a vortex magnetic state such as symmetrically and asymmetrically shaped nanorings (FIG. 7C), having small diameters (e.g., on the order of 100 nm). In particular embodiments, the width and thickness of the maxima and minima thereof are located on opposite sides of the nanoring. Also featured are methods for fabricating such symmetrically and asymmetrically shaped nanorings (FIG. 1). Also featured are methods for controlling the reversal process so as to thereby create vortex states in such asymmetric nanorings by controlling the field angle (FIG. 9).Type: GrantFiled: June 6, 2011Date of Patent: July 24, 2012Assignee: The Johns Hopkins UniversityInventors: Frank Qing Zhu, Chia-Ling Chien
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Publication number: 20110315656Abstract: Featured is a magnetic ring structure including at least a vortex magnetic state such as symmetrically and asymmetrically shaped nanorings, having small diameters (e.g., on the order of 100 nm). In particular embodiments, the width and thickness of the asymmetrical nanorings varies as a function of the locations on the circumference so that maxima and minima thereof are located on opposite sides of the nanoring. Also featured are methods for fabricating such symmetrically and asymmetrically shaped nanorings. Also featured are methods for controlling the reversal process so as to thereby create vortex states in such asymmetric nanorings by controlling the field angle.Type: ApplicationFiled: June 6, 2011Publication date: December 29, 2011Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Frank Q. Zhu, Chia-Ling Chien
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Publication number: 20110311791Abstract: A method for assembling multi-component nano-structures that includes dispersing a plurality of nano-structures in a fluid medium, and applying an electric field having an alternating current (AC) component and a direct current (DC) component to the fluid medium containing the plurality of nano-structures. The electric field causes a first nano-structure from the plurality of nano-structures to move to a predetermined position and orientation relative to a second nano-structure of the plurality of nano-structures such that the first and second nano-structures assemble into a multi-component nano-structure.Type: ApplicationFiled: March 3, 2010Publication date: December 22, 2011Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Chia-Ling Chien, Donglei Fan, Robert Charles Cammarata
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Patent number: 7983074Abstract: Featured is a magnetic ring structure including at least a vortex magnetic state such as symmetrically and asymmetrically shaped nanorings (FIG. 7C), having small diameters (e.g., on the order of 100 run). In particular embodiments, the width and thickness of the maxima and minima thereof are located on opposite sides of the nanoring. Also featured are methods for fabricating such symmetrically and asymmetrically shaped nanorings (FIG. 1). Also featured are methods for controlling the reversal process so as to thereby create vortex states in such asymmetric nanorings by controlling the field angle (FIG. 9).Type: GrantFiled: March 14, 2006Date of Patent: July 19, 2011Assignee: The Johns Hopkins UniversityInventors: Frank Qing Zhu, Chia-Ling Chien
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Publication number: 20090146767Abstract: Featured is a magnetic ring structure including at least a vortex magnetic state such as symmetrically and asymmetrically shaped nanorings, having small diameters (e.g., on the order of 100 nm). In particular embodiments, the width and thickness of the asymmetrical nanorings varies as a function of the locations on the circumference so that maxima and minima thereof are located on opposite sides of the nanoring. Also featured are methods for fabricating such symmetrically and asymmetrically shaped nanorings. Also featured are methods for controlling the reversal process so as to thereby create vortex states in such asymmetric nanorings by controlling the field angle.Type: ApplicationFiled: March 14, 2006Publication date: June 11, 2009Applicant: The Johns Hopkins UniversityInventors: Frank Q. Zhu, Chia-Ling Chien
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Publication number: 20080204966Abstract: Systems and methods for manipulating nanostructures, such as nanospheres, nanodisks, nanowires, and nanotubes. The systems and methods permit the construction of nano-scale contacts, scaffolds, and motors using electric fields that do not require the use of toxic nanostructure materials. The electric fields are imposed on the nanostructures using electrodes having specific shapes and driven with voltages having particular amplitudes, frequencies, and phase differences. The electrode shape and voltage characteristics influence the configuration of the electric fields, which in turn influences the ultimate configuration of the nanostructures. The nanostructures retain their configuration after the electric fields and any transport medium, such as deionized water, are removed.Type: ApplicationFiled: September 21, 2005Publication date: August 28, 2008Applicant: THE JOHNS HOPKINS UNIVERSITYInventors: Donglei Fan, Frank Q. Zhu, Chia-Ling Chien, Robert C. Cammarata
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Patent number: 7132275Abstract: The invention provides multisegmented, multifunctional magnetic nanowires for the probing and manipulation of molecules at the cellular and subcellular level. The different segments of the nanowire may have differing properties, including a variety of magnetic, non-magnetic, and luminescent behavior. Differences in surface chemistry allow different segments of a single nanowire to be functionalized with different multiple functional groups and/or ligands, giving the wire chemical multifunctionality.Type: GrantFiled: May 14, 2002Date of Patent: November 7, 2006Assignee: The John Hopkins UniversityInventors: Daniel Reich, Gerald Meyer, Chia-Ling Chien, Christopher Chen, Peter C. Searson
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Patent number: 6596101Abstract: Preferred embodiments of the invention provide new nanostructured materials and methods for preparing nanostructured materials having increased tensile strength and ductility, increased hardness, and very fine grain sizes making such materials useful for a variety of applications such as rotors, electric generators, magnetic bearings, aerospace and many other structural and nonstructural applications. The preferred nanostructured materials have a tensile yield strength from at least about 1.9 to about 2.3 GPa and a tensile ductility from at least 1%. Preferred embodiments of the invention also provide a method of making a nanostructured material comprising melting a metallic material, solidifying the material, deforming the material, forming a plurality of dislocation cell structures, annealing the deformed material at a temperature from about 0.30 to about 0.70 of its absolute melting temperature, and cooling the material.Type: GrantFiled: October 3, 2001Date of Patent: July 22, 2003Assignee: Johns Hopkins UniversityInventors: Timothy P. Weihs, Robert Cammarata, Chia-Ling Chien, Changhe Shang
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Publication number: 20020187504Abstract: The invention provides multisegmented, multifunctional magnetic nanowires for the probing and manipulation of molecules at the cellular and subcellular level. The different segments of the nanowire may have differing properties, including a variety of magnetic, non-magnetic, and luminescent behavior. Differences in surface chemistry allow different segments of a single nanowire to be functionalized with different multiple functional groups and/or ligands, giving the wire chemical multifunctionality.Type: ApplicationFiled: May 14, 2002Publication date: December 12, 2002Inventors: Daniel Reich, Gerald Meyer, Chia-Ling Chien, Christopher Chen, Peter C. Searson
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Publication number: 20020069944Abstract: Preferred embodiments of the invention provide new nanostructured materials and methods for preparing nanostructured materials having increased tensile strength and ductility, increased hardness, and very fine grain sizes making such materials useful for a variety of applications such as rotors, electric generators, magnetic bearings, aerospace and many other structural and nonstructural applications. The preferred nanostructured materials have a tensile yield strength from at least about 1.9 to about 2.3 GPa and a tensile ductility from at least 1%. Preferred embodiments of the invention also provide a method of making a nanostructured material comprising melting a metallic material, solidifying the material, deforming the material, forming a plurality of dislocation cell structures, annealing the deformed material at a temperature from about 0.30 to about 0.70 of its absolute melting temperature, and cooling the material.Type: ApplicationFiled: October 3, 2001Publication date: June 13, 2002Inventors: Timothy P. Weihs, Robert Cammarata, Chia-Ling Chien, Changhe Shang
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Patent number: 6358392Abstract: The invention is directed to the use of electrochemical deposition to fabricate thin films of a material (e.g., bismuth) exhibiting a superior magnetoresistive effect. The process in accordance with a preferred embodiment produces a thin film of bismuth with reduced polycrystallinization and allows for the production of single crystalline thin films. Fabrication of a bismuth thin film in accordance with a preferred embodiment of the invention includes deposition of a bismuth layer onto a substrate using electrochemical deposition under relatively constant current density. Preferably, the resulting product is subsequently exposed to an annealing stage for the formation of a single crystal bismuth thin film. The inclusion of these two stages in the process produces a thin film exhibiting superior MR with a simple field dependence in the process suitable for a variety of field sensing applications.Type: GrantFiled: November 18, 1999Date of Patent: March 19, 2002Assignee: The Johns Hopkins UniversityInventors: Fengyuan Yang, Kai Liu, Chia-Ling Chien, Peter C. Searson
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Patent number: 6187165Abstract: Novel arrays of nanowires made of semi-metallic Bismuth (Bi) is disclosed made by unique electrodeposition techniques. Because of the unusual electronic properties of the semi-metallic Bi and the nanowire geometry, strong finite size effects in transport properties are achieved. In addition, very large positive magnetoresistance, 300% at low temperatures and 70% at room temperature, with quasilinear field dependence have been attained.Type: GrantFiled: October 1, 1998Date of Patent: February 13, 2001Assignee: The John Hopkins UniversityInventors: Chia-Ling Chien, Peter C. Searson, Kai Liu
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Patent number: 4973525Abstract: Improved cermets having superior properties comprising a ferromagnetic metal and an insulator. By controlling process conditions, cermets having high magnetization and high coercivity as well as chemical stability, wear resistance and corrosion resistance are prepared. The cermets of this invention find particular utility as high density recording media.Type: GrantFiled: October 14, 1988Date of Patent: November 27, 1990Assignee: The Johns Hopkins UniversityInventors: Chia-Ling Chien, Gang Xiao, Sy-Hwang Liou