David Arnold's Research Group

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Group lead: 

Dr. Arnold's Research group specializes in:

  • Micro/nanostructured magnetic materials
  • Magnetic microsystems and electromechanical transducers
  • Biomedical applications of magnetic systems
  • Compact (<100 W) power/energy systems (wireless power, energy harvesting, interface circuits)

This diverse group of researchers and students are participating in projects involving the fabrication of new magnetic nanocomposite materials on semiconductor substrates, using magnetic microdiscs for capture and detection of bacteria (e.g. E. coli), inventing new wireless charging systems for wearables/implantables, and developing compact ULF/ELF radio transmitters for localization, imaging, and more.

 

OPEN RESEARCH POSITIONS

Undergraduate Student Research Assistants - Multiple positions available.

Dr. Arnold welcome students from all backgrounds.  Typically, a minimum undergrad GPA of 3.5 is expected.  Positions are initially "volunteer," but will be eagerly converted to paid once competency can be demonstrated and specific goals are defined.  If interested, please email Dr. David Arnold (darnold@ufl.edu) with:

  • position #
  • resume
  • academic transcipt (unofficial)
  • estimated graduation date
  • 1-2 sentence describing grad school/career aspirations

 

Position #1

Project: Magnetic Nanoparticles and Symbiosis (Moore Foundation)

Location: 40% remotely, 60% on-campus 

Description: Design, optimize, and develop a magnetic coil apparatus to be used for magnetic field stimulation of live cells under a microscope.

Role and Responsibilities

  • Design/optimization/development of a magnetic coil apparatus
    • Student will use tools such as, MATLAB and COMSOL Multiphysics to model coil configurations that meet project’s needs (size, magnetic field intensity, frequencies, magnetic field gradients, etc.)
    • Student will build/wind coils and use tools such as, power supplies, amplifiers, oscilloscopes, and other electrical testing equipment

Requirements

  • Undergraduate student from a science/engineering discipline (ECE, PHYS, MSE or related)

Preferred Skills:

  • Basic knowledge of magnetic fields / coils
  • Experience with electrical testing equipment
  • Experience with MATLAB
  • Experience with COMSOL Multiphysics

 

Position #2

Project: Magnetic Nanoparticles and Symbiosis (Moore Foundation)

Location: 60% remotely, 40% on-campus 

Description: Design and 3D print a platform for a magnetic coil apparatus to be used for magnetic field stimulation of live cells under a microscope.

Role and Responsibilities

  • Design and 3D print a platform for a magnetic coil apparatus
    • Student will use tools such as, Solidworks, AutoCAD, or any other computer aided design (CAD) software to design the platform that meets a magnetic coil apparatus (to be designed by another student) and microscope needs (coil size, sample holder, microscope platform, lenses field of view, etc.)
    • Student will use a 3D printer, such as, Ultimaker 3 Extended (available in the lab) for the designed platform.

Requirements

  • Undergraduate student from a science/engineering discipline (ME, ECE, MSE, or related)

Preferred Skills:

  • Experience with a CAD software, such as, Solidworks or AutoCAD
  • Experience using a 3D printer

 

 

Position #3

ProjectRapid On-site Detection of Fecal Indicating Bacteria for Coastal Water Quality Monitoring (Sea Grant PR)

Location: 10% remotely, 90% on-campus

Description: Perform hands-on experiments for the capture of biosafety level 1 (BSL-1) biological targets (E. coli and Enterococcus) using magnetic microdiscs and a microfluidic magnetic separation device for water quality monitoring applications.

Role and Responsibilities

  • Perform hands-on experiments for the capture of BSL-1 biological targets (i.e. E. coli and Enterococcus) using magnetic microdiscs and a microfluidic magnetic separation device
    • Fabrication
      • Student(s) will learn how to fabricate simple microfluidic devices, as well as to incorporate magnetic ‘traps’ to the final devices for magnetic capture of microdiscs/target cells
    • Bio experiments
      • Student(s) will learn how to bio-functionalized the magnetic microdiscs to target specific cells
      • Student(s) will perform supervised (and unsupervised) experiments using the bio-functionalized microdiscs to target the biological targets using:
      • Fluorescence labels for cells
      • Fluorescence microscope
      • Student will use tools such as MATLAB, MS Excel, ImageJ, or other to process images obtained from experiments

Requirements

  • Undergraduate student from a science/engineering discipline (ECE, MSE, ChemE, BME, or related)

Preferred Skills:

  • Basic knowledge of magnetism and/or magnetic particles
  • Experience or interest in hands-on BSL-1 biological cell experiments
  • Experience with fluorescence microscopy
  • Experience with MATLAB, MS Excel, and/or ImageJ
  • Interest in potential field visits to collect water samples

 

Position #4

ProjectRapid On-site Detection of Fecal Indicating Bacteria for Coastal Water Quality Monitoring (Sea Grant PR)

Location: 50% remotely, 50% on-campus

Description: Design and develop (1) a portable smartphone-based fluorescence microscope and (2) a 3D-printed platform for this handheld apparatus to be used for on-site water quality monitoring.

Role and Responsibilities

  • Design and develop a portable fluorescence microscope using a smartphone device   
    • Student will research and find appropriate excitation/emission filters, lenses, etc for the detection of target bacteria (E. coli and Enterococcus) that will be labelled using (green and/or red) fluorescent tags (SYTO9)
  • Design and 3D print a platform for the fluor-scope smartphone apparatus
    • Student will use tools such as, Solidworks, AutoCAD, or any other computer aided design (CAD) software to design the platform that meets the smartphone setup needs (excitation/emission filters, sample holder, lenses, field of view, etc.)
    • Student will use a 3D printer, such as, Ultimaker 3 Extended (available in the lab) for the designed platform

Requirements

  • Undergraduate student from a science/engineering discipline (ECE, ME, PHYS, or related)

Preferred Skills:

  • Basic knowledge or interest in fluorescence microscopy 
  • Experience with a CAD software, such as, Solidworks or AutoCAD
  • Experience using a 3D printer

 

Position #5

ProjectRapid On-site Detection of Fecal Indicating Bacteria for Coastal Water Quality Monitoring (Sea Grant PR)

Location: 100% remote

Description: Develop a mobile app for image acquisition along with an image processing algorithm to process images obtained using a smartphone-based fluorescent microscopy apparatus.

Role and Responsibilities

  • Develop a mobile app for image acquisition using the smartphone-based fluorescence microscope
    • Student will use tools such as, Android Studio, Xcode, or any other mobile app development environment or software
  • Develop an image processing algorithm to process images obtained using the smartphone-based fluorescence microscope
    • Student will research and find appropriate image processing algorithms to detect and potentially near-quantify the presence of bacteria in samples (pixel intensity/color quantification, edge detection, etc.). 
    • Student will use tools such as, MATLAB, Python, or other computing environment

Requirements

  • Undergraduate student from a science/engineering discipline (ECE, CSE, or related)

Preferred Skills:

  • Basic knowledge or interest in image processing 
  • Experience with a MATLAB, Python, or other computing environment 
  • Experience with mobile app development

 

Position #6

Project: Wireless Neural Stimulation using Magnetoelectric Devices  (funding TBD)

Location: 50% remote, 50% on campus

Description:  Investigate, design, fabricate, and test a wireless nueral stimulation device that uses a magnetoelectic device to convert a magnetic field into an electric voltage.  The application is wireless stimulation of neural implants using externally applied magnetic fields.

Role and Responsibilities

  • Work with a postdoc/grad student to evaluate various design approaches
    • Options may include microfabricated nanowire devices vs. hand-made microassembled layered composites
  • Design, simulate, fabricate, and test nueral stimulation devices
    • May include simulation tools such as COMSOL Multiphyiscs
    • Electronic and magnetic field measurements
  • In the long-term, testing may include experiements in animal models with collaborators

Requirements

  • Undergraduate student from a science/engineering discipline (MSE, CHE, ECE, or related)

Preferred Skills:

  • Basic understanding of materials
  • Experience with MATLAB, Python
  • Experience with COMSOL Multiphyiscs 
  • Experience with electronic or magnetic measurements