Engineering microscale magnetic devices for next-generation microrobotics
…using magnets to fabricate microrobots and revolutionize manufacturing industry…
Research Interests
I am constantly seeking a translational research environment to apply my creativity with an entrepreneurial and leadership mindset.
I'm currently working as Postdoctoral Research Associate at the Department of Mechanical Engineering, Carnegie Mellon University.
Into the future
Presentations
Actuators for Microrobotics
Invited Presentation at the The Mid-Atlantic Micro Nano Alliance called “Actuators for Microrobotics using Microfabrication, Additive Manufacturing, and Shape Memory Alloys”. October 6th 2020
Learn MoreElectro Permanent Magnets
This is a presentation at PowerMEMS 2017 describing our advancements in Electro Permanent Magnets (EPMs).
Learn MoreCOMSOL Simulations
Joule heating actuator
Joule heating micro actuator tutorial
Modeling of permanent magnets
COMSOL Multiphysics tutorial on modeling permanent magnets.
Microfluidics
Microfluidic system for particle manipulation - Four Roll Mill
Magnetic particles in fluids
Examples of COMSOL simulations involving flowing fluids and magnetic particles.
Cantilever Beam simulations
Tutorials on how to simulate cantilever beams.
Curriculum Vitae
- Ph.D. Electrical and Computer Engineering (August 2017)
Dissertation Title: “Engineering microscale magnetic devices for next-generation microrobotics”
Advisor: Professor David P. Arnold
Research Funded by NSF, NIH, DARPA, AFOSR MURI
- Microsystems Technology Certificate
- Engineering Leadership Certificate
- Engineering Entrepreneurship Certificate
- M.S. Electrical and Computer Engineering (2015)
Research topics: MEMS, microfabrication, magnetic materials, nanoparticles, reliability of AlGaN-GaN HEMT.
- M.E. Electronics and Computers (2012)
M.E. Thesis Title: “Design and fabrication of a microfluidic system for size particle separation”
Research topics: Lab on a chip, Microfluidics, MEMS, Particle Separation, micro fabrication.
Advisor: Dr. Johann Osma
- B.S. Electronic Engineer (2007)
B.S. Thesis Title: “Design Methodology and Implementation of a Monolithic Frequency Synthesizer Circuit in a 0.25 μm CMOS Fabrication Process”.
Research topics: VLSI design, PLL, VCO, mix-signal design, Digital VLSI design, Analog VLSI Design
Emphasis: Processor architecture, digital logic, digital/analog electronic design.
Teaching Statement
My academic training during high school, bachelors and Scout movement was strongly shaped by the principles of the Ignatian pedagogical paradigm[1], [2] (S.J., Jesuits – Catholic congregation) that combines a holistic view of the world, with a deep concern for the person to be form, structured in five fundamental elements: Experience, Reflection and Action, preceded by Context as a pre-learning element, and succeeded by Evaluation (Assessment) as a post-learning element. This paradigm is more than 400 years old and still valid, but in the modern context of teaching at university level it is possible to observe the same structure in the constructive alignment theory[3], were the experience is the center of the learning process (easy to understand why I believe the strongest resource for successful learning is the experimentation) and the intended learning outcomes are the fundamental glue that connects all the steps of the learning process. I understand that my role as faculty is to describe these learning outcomes and to recreate teaching/learning activities that fulfill them. Perhaps my strongest strategy to embrace and apply this philosophy is through mentoring. I’ve been mentoring volunteer undergrad students at University of Florida (MIST makers), and help them design IoT (internet of things) applications for gardening, lake environmental monitoring and low-cost weather station. Students learn by solving real problems with real “customer-like” challenges.
Translating these elements into engineering context, three steps are needed to structure any pedagogical process with my students: (1) To define educational objectives and learning outcomes oriented towards development competences in engineering. (2) To implement teaching strategies (laboratories, experiments, demonstrations, case studies, individual and team projects). I personally believe one of the best strategies are active learning, because it reinforces the concept that the student must participate at class by taking actions during the process (once again linked with experimentation) and creating activities that enable the student to “practice by doing”. The other strategy I promote is problem-based learning (PBL) with strong emphasis in design methodology. (3) To incorporation strategies for formative assessment. I am not the biggest advocate for exams, but I believe in student assessment, feedback and rubrics. My conviction is that these steps are fundamental to educate the future generation of engineers. It is important to highlight that those steps can be implemented in classroom (graduate and undergraduate) as well as in the research advisor context. I experimented for two years with PBL method (guided by researchers at the Department of Education at Universidad de los Andes) in semiconductor material courses. Student devoted class hours to solve problems (individually or in groups) rather to receive lecture. I also implemented active learning by creating challenging design projects in digital logic and processor architecture courses.
All these steps must be aligned through the entire process. To guaranty this alignment and the overall quality of this teaching process is precisely the intention of the ABET accreditation. Having an ABET accreditation is taking by granted at most programs in United States, and the accreditation is so absorbed by the institution’s members that most of the guidelines are no longer discussed; I had the advantage of participating actively in changes required by my institution (Universidad de los Andes) to obtain this accreditation. Therefore, I had to study these guidelines and materialize the implementation of objectives and competences for the courses that I was teaching at that time.
An additional component that I envision to include as my teaching signature is the leadership and entrepreneurial mindset. By creating projects and homework’s oriented towards real problems and problem-solving ideas (customer oriented). Today more than ever, it is necessary to work and collaborate in interdisciplinary teams to solve the most complex problems in engineering. Consequently, developing leadership competences is fundamental for the student’s success in building effective teams to solve those problems. Moreover, some of those future engineers will also require the entrepreneur spirit to create companies and lead projects that will address those issues at a commercial and industry level. In some way, this is a natural extension of the problem-based learning environment.
TEACHING BACKGROUND
- I have extensive experience as teaching assistant for more than 20 courses at graduate and undergraduate level at 3 different universities. I have theoretical and practical skills in more than 13 different areas, ranging from microfabrication, MEMS, digital logic, process architecture, semiconductor devices, digital and analog electronics, electronics design.
- I was co-author in the development of a lab course for semiconductor microfabrication (graduate level) at University of Florida where I designed the laboratories and wrote the course documentation.
- With 9 years of experience working with COMSOL multiphysics I have created tutorials and videos for multiphysics simulation (finite element method - FEM) training at graduate level.
- I have formally mentored five graduates, six undergraduates and three high school students at 4 different universities, some of those students were mentored online. Mentoring resulting in conference paper, poster, patent and undergraduate capstone project.
- I have experience teaching/tutoring users in industry as well as academia. I have six years of experience as a freelance tutoring for mathematics, physics and engineering courses.
- Nine years of experience leading extracurricular activities for big groups of children (between 7-18 years old) and training other volunteers in pedagogical techniques for non-formal education, supported by a combined history of more than 20 years in the World Scout movement as participant and volunteer.
I can strongly contribute with existing courses at your department.
- Strongest preference based on my research experience
- Microfabrication Technology
- Introduction to Microelectromechanical Systems (MEMS)
- Advanced Topics in Mems, Microsensors, and Microactuators
- Introduction to Digital Electronics
- Introductory Microcomputer Interfacing Laboratory
- Microelectronic Devices and Circuits
- Future courses
- Mentoring and advising students
By any means, I believe I have all pedagogic tools and teaching skills for creating a successful learning environment, therefore I want to continue my education in teaching strategies and I will always welcome interaction, cooperation and feedback from other colleagues, faculty and students to keep our classes at the leading edge of the learning field. Therefore, I envision two fundamental collaborations at your institution: 1) Department of Education, to continue improving my classes and pedagogic skills through constant assessment. 2) Innovation and Entrepreneurship organization (specially in Engineering), because I believe the positive impact that bridging the gap between engineering research and entrepreneurship will bring to the university.
REFERENCES
[1] G. W. Traub, A Jesuit education reader. Loyola Press, 2008.
[2] M. McAvoy, “Training Faculty to Adopt the Ignatian Pedagogical Paradigm , IPP and its Influence on Teaching and Learning : Process and Outcomes,” Jesuit High. Educ. A J., vol. 2, no. 2, pp. 62–109, 2013.
[3] J. Biggs and C. Tang, Teaching for Quality Learning at University, Third Edit., vol. 9. McGraw-Hill, 2007.
Publications
Journal Publications:
[16] C. Velez, D. K. Patel, S. Kim, M. Babaei, C. R. Knick, G. L. Smith, and S. Bergbreiter, “Hierarchical Integration of Thin-Film NiTi Actuators using Additive Manufacturing for Microrobotics,” J-MEMS (Accepted – In print).
[15] M. Babaei, S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “Increasing the Energy Efficiency of NiTi Unimorph Actuators with a 3D-Printed Passive Layer,” J-MEMS (Submitted - Under review).
[14] S. Kim, C. Velez, R. St. Pierre, G. L. Smith, and S. Bergbreiter, “A Two-Step Fabrication Method for 3D Printed Microactuators: Characterization and Actuated Mechanisms,” J-MEMS, 2020 (Early Access).
[13] O. L. Lanier, C. Velez, D. P. Arnold, and J. Dobson, “Magnetic Particle Capture Device Model for Removal of Pro-Inflammatory Cytokines During Cardiopulmonary Bypass,” IEEE Transactions on IEEE Transactions on Biomedical Engineering (Submitted – Under review).
[12] C. Velez, S. Hwangbo, S. Chyczewski, J. Ewing, R. Bowrothu, C. Smith, Y.K. Yoon, and D. P. Arnold, “Screen-printed barium ferrite/samarium cobalt composites with tailorable ferromagnetic resonance,” IEEE Transactions on Microwave Theory and Techniques, special issue. Volume: 67, Issue: 8, Aug. 2019.
[10] C. Velez, R. E. Carroll, and D. P. Arnold, “Direct measurement and microscale mapping of nanoNewton to milliNewton magnetic forces,” AIP Adv., vol. 7, no. 5, pp. 56809-1-56809–6, May 2017.
[9] Z. Zhao, I. Torres-Díaz, C. Vélez, D. Arnold, and C. Rinaldi, “Brownian Dynamics Simulations of Magnetic Nanoparticles Captured in Strong Magnetic Field Gradients,” J. Phys. Chem. C, vol. 121, no. 1, pp. 801–810, 2017.
[8] A. Garraud, C. Velez, Y. Shah, N. Garraud, B. Kozissnik, E. G. Yarmola, K. D. Allen, J. Dobson, and D. P. Arnold, “Investigation of the capture of magnetic particles from high-viscosity fluids using permanent magnets,” IEEE Trans. Biomed. Eng., vol. 63, no. 2, pp. 372–378, 2016.
[7] C. Velez, I. Torres-Díaz, L. Maldonado-Camargo, C. Rinaldi, and D. P. Arnold, “Magnetic Assembly and Cross-Linking of Nanoparticles for Releasable Magnetic Microstructures.,” ACS Nano, vol. 9, no. 10, pp. 10165–72, Oct. 2015.
[6] S. Li, Y. Hwang, Y. Hsieh, L. Lei, F. Ren, S. J. Pearton, E. Patrick, M. E. Law, C. V. Cuervo, and D. J. Smith, “Enhancement of AlGaN / GaN high electron mobility transistors off-state drain breakdown voltage via backside proton irradiation,” J. Vac. Sci. Technol. B, vol. 32, no. 2, pp. 1–6, 2014.
[5] G. Yang, Y. Jung, C. V. Cuervo, F. Ren, S. J. Pearton, and J. Kim, “GaN-based light-emitting diodes on graphene-coated flexible substrates,” Opt. Express, vol. 22, no. S3, p. A812, Apr. 2014.
[4] L. Liu, C. Velez Cuervo, Y. Xi, F. Ren, S. J. Pearton, H.-Y. Kim, J. Kim, and I. I. Kravchenko, “Impact of proton irradiation on dc performance of AlGaN/GaN high electron mobility transistors,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 31, no. 4, p. 42202, 2013.
[3] E. Patrick, M. E. Law, L. Liu, C. Velez Cuervo, Y. Xi, F. Ren, and S. J. Pearton, “Modeling proton irradiation in AlGaN/GaN HEMTs: Understanding the increase of critical voltage,” IEEE Trans. Nucl. Sci., vol. 60, no. 6, pp. 4103–4108, 2013.
[2] Y.-H. Hwang, L. Liu, C. Velez, F. Ren, B. P. Gila, D. Hays, S. J. Pearton, E. Lambers, I. I. Kravchenko, C.-F. Lo, and J. W. Johnson, “GaN metal–insulator–semiconductor high-electron-mobility transistor with plasma enhanced atomic layer deposited AlN as gate dielectric and passivation,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 31, no. 5, p. 52201, 2013.
[1] X. Wang, C.-F. Lo, L. Liu, C. V. Cuervo, R. Fan, S. J. Pearton, B. Gila, M. R. Johnson, L. Zhou, D. J. Smith, J. Kim, O. Laboutin, Y. Cao, and J. W. Johnson, “193 nm excimer laser lift-off for AlGaN/GaN high electron mobility transistors,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 30, no. 5, p. 51209, 2012.
Archival, Peer-Reviewed Conference Publications:
[11] S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “A Magnetically Transduced Whisker for Angular Displacement and Moment Sensing,” 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Macau, November 4-8, China (in print).
[10] C. Velez, J. Ewing, S. Hwangbo, K. Sondhi, T. Schumann, Y.K. Yoon, and D. P. Arnold, “Low-temperature micropatterning of thick-film BaFe12O19 composites on semiconductor substrates for integrated millimeter wave devices,” 2018 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), Ann Arbor, MI, 2018, pp. 1-3.
[9] N. Scaife, C. Peeters, C. Velez, H. Zhao, P. Traynor and D. Arnold, "The Cards Aren't Alright: Detecting Counterfeit Gift Cards Using Encoding Jitter," 2018 IEEE Symposium on Security and Privacy (SP), San Francisco, CA, US., pp. 695-708.
[8] C. Velez, L. P. Tatum, B. Herstein, C. P. Becker and D. P. Arnold, “Batch-fabrication and characterization of miniaturized axisymmetric electropermanent magnets,” in 17th international conference on micro and nanotechnology for power generation and energy conversion applications (PowerMEMS), 2017, pp. 206-210.
[7] C. Velez and D. P. Arnold, “Microfabrication of Magnetically Attached End Effectors for Micro / Milli Robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp. 17-19.
[6] C. Velez, D. P. Arnold, Z. I. Gonzalez, and J. F. Osma, “Sub-millimeter Electropermanent Magnets for Microgrippers,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp. 20-22.
[5] A. Hsu, C. Cowan, W. Chu, B. Mccoy, A. Wong-foy, R. Pelrine, C. Velez, D. Arnold, J. Lake, J. Ballard, J. Randall, and A. D. L. Micro-robots, “Automated 2D Micro-Assembly Using Diamagnetically Levitated Milli-Robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp.160-165. BEST APPLICATION PAPER AWARD.
[4] C. Velez, I. Torres-Díaz, L. Maldonado-Camargo, C. Rinaldi, and D. P. Arnold, “Fabrication of patterned magnetic microstructures using magnetically assembled nanoparticles,” in The 28th IEEE International Conference on Micro Electro Mechanical Systems, 2015, pp. 964–967.
[3] C. Velez, W. C. Patterson, and D. P. Arnold, “Simulation and experimental validation of a selective magnetization process for batch-patterning magnetic layers,” in Journal of Physics: Conference Series, 2015, vol. 660, pp. 3–7.
[2] A. Garraud, B. Kozissnik, C. Velez, E. G. Yarmola, L. Maldonado-Camargo, C. Rinaldi, K. D. Allen, J. Dobson, and D. P. Arnold, “Collection of magnetic particles from synovial fluid using Nd-Fe-B micromagnets,” in Proc. Design, Test, Integration and Packaging of MEMS/MOEMS Symposium (DTIP 2014), 2014, pp. 97–102.
[1] C. Velez, L. F. Ariza, J. F. Osma, and A. Avila, “Velocity and pressure analysis for microchannel networks,” in 2010 IEEE Andescon, 2010, pp. 1–5.
Other Conference Abstracts/Presentations/Poster:
[18] C. Velez, D. K. Patel, S. Kim, M. Babaei, C. Knick, G. Smith, and S. Bergbreiter, “Combining micro fabrication and additive manufacturing for microrobotic mechanisms,” Hilton Head Workshop 2020: A Solid-State Sensors, Actuators and Microsystems Workshop, 2020 (Accepted - Oral).
[17] M. Babaei, S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “Increasing the Work Efficiency of NiTi Unimorph Actuators,” Hilton Head Workshop 2020: A Solid-State Sensors, Actuators and Microsystems Workshop, 2020 (Accepted - Poster).
[16] C. Velez, S. Kim, M. Babaei, D. K. Patel, C. Knick, G. Smith, and S. Bergbreiter, “Rapid prototyping of microactuators by integrating 3D printed polymeric structures with NiTi thin film,” 33rd International Conference on Micro Electro Mechanical Systems, IEEE MEMS. Vancouver-Canada, 2020.
[15] C. Velez, R. E. Pelrine, and D. P. Arnold, “Batch-fabrication of diamagnetically levitated microrobots,” in Solid-State Sensors, Actuators and Microsystems Workshop, pp. 66-66 2018 (oral).
[14] A. Alfred, C. Falck, L. F. De Pina, D. Girard, D. Tansel, D. Tola, A. Weber, J. Williams, C. Velez, G. Walters, Y. Yoon, and T. Nishida, “Smart Lake- A Modular Internet-connected Water Quality Monitoring System,” in PRAGMA 32: Internet of people and things, 2017, BEST POSTER AWARD.
[13] C. Velez, C. Becker, and D. P. Arnold, “Investigation of axisymmetric sub-millimeter electropermanent magnets,” in PowerMEMS, 2016, p. 32611.
[12] C. Velez and D. P. Arnold, “Batch-fabrication of magnetically patterned bases for diamagnetically levitated micro-robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2016.
[11] O. L. Lanier, C. Velez, and J. Dobson, “Simulation of magnetic particle capture for extracorporeal magnetic separation of inflammatory cytokines for cardiopulmonary bypass (CPB) procedures,” in Biomedical Engineering Society annual conference, 2016.
[10] O. L. Lanier, C. Velez, and J. Dobson, “Magnetic nanoparticle capture simulation for extracorporeal separation of cytokines in blood,” in NanoFlorida, 2016.
[9] A. Garraud, C. Velez, Y. Shah, N. Garraud, B. Kozissnik, E. G. Yarmola, K. D. Allen, J. P. Dobson, and D. P. Arnold, “Analysis of Microscale Permanent Magnets for Capturing Magnetic Particles in Biological Fluids,” in Frontiers in BioMagnetic Particles, 2015. BEST POSTER AWARD
[8] C. Vélez, D. Cruz, J. C. Gonzalez, S. C. Medina, O. F. Sanchez, A. Avila, and J. F. Osma, “Size microcapsule separation using microfluidic systems,” in Ibersensor, 2014, p. 331.
[7] C. Velez, I. Torres-díaz, L. Maldonado-camargo, C. Rinaldi, and D. P. Arnold, “Fabrication of magnetic microstructures by in situ crosslinking of magnetically assembled nanoparticles,” in Solid-State Sensors, Actuators and Microsystems Workshop, 2014, no. c, pp. 331–334.
[6] K. A. Y. Shah, C. C. Velez, E. Yarmola, D. Arnold, J. Dobson, “Designing a probe for the magnetic collection of molecular biomarkers in joints for early detection of osteoarthritis,” in Biomedical Engineering Society Annual Meeting, 2014.
[5] C. Velez, L. Liu, F. Ren, S. J. Pearton, J. Kim, R. C. Fitch, D. E. Jr. Walker, K. D. Chabak, J. K. Gillespie, M. Kossler, M. Trejo, and A. Crespo, “Effects of Proton Irradiation on Reliability and DC Performances Of AlGaN/GaN High Electron Mobility Transistors,” in Florida Chapter of the AVS Science and Technology Society (FLAVS) 2013 Annual Joint Symposium & Exhibition, 2013.
[4] C. Velez, S. Silva, X. Wang, A. G. Mancera, C. Leidy, J. F. Osma, and F. Ren, “Comparison Techniques For Fabricating Microfluidic Four-Roll Mill On Glass Substrates,” in AVS 59th International Symposium & Exhibition, 2012.
[3] C. V. Cuervo, M. D. L. Teixeira, and D. Li, “Microneedle Based ECG – Glucose Sensor Design Proposal,” in NanoFlorida, 2010, p. 73644.
[2] J. M. Garz, J. Sebastian, M. Baquero, J. C. Ortiz, C. Velez, and J. F. Osma, “Manufacture of Aluminium Micromirrors on Glass,” in Third Colombian Meeting on Micro and Nano Technology, 2010, vol. 4, no. 1, p. 70403.
[1] D. M. Camacho, M. Ieee, C. Vélez, G. Yamhure, C. M. C, and J. A. Garcia, “Recomendaciones Para La Implementación Del Layout De Circuitos Monolíticos de Señal,” in IEEE Colombian Workshop on Circuits and Systems (CWCAS07), 2007, pp. 1–6.
Press Coverage:
[5] C. Velez, “CARRERA INGENIERÍA ELECTRÓNICA- Testimonio Camilo Vélez,” Youtube, https://www.youtube.com/watch?v=PBFKAq_SO_g&t=1s , August 3, 2018.
[4] C. Velez, “Young Professionals: Reflections from EDS Young Professionals,” Electron Devices Society Newsletter, vol. 25, no. 2, pp. 28, 2018.
[3] C. Velez, “Microrobots and science fiction” Laud 90.4 FM stereo, Bogotá-Colombia September 17, 2017.
[2] C. Velez, “Engine machine – Micro-nano robots” UFM stereo, Armenia-Colombia September 1, 2017.
[1] C. Velez, “Young Professionals: Reflections from EDS Young Professionals,” Electron Devices Society Newsletter, vol. 23, no. 4, pp. 24–25, 2017.
Invited Presentations:
[11] “Engineering next-generation microrobotic,” University of California Irvine, Irvine, CA - USA, 2020 (Invited seminar).
[10] “Fundamentals of microrobotics and magnetic manipulation at small scale,” 2nd Colombian School on Magnetism and Magnetic Materials, Bogotá-Colombia, 2019 (Tutorial session).
[9] “Magnetism in the world of insect-size robots,” 2nd Colombian School on Magnetism and Magnetic Materials, Bogotá-Colombia, 2019 (Invited speaker).
[8] “Alternative approaches for magnetic locomotion at microscale,” Carnegie Mellon University – Locomotion Seminar, Pittsburgh-USA, 2019.
[7] “The importance of magnetic microrobots in bioengineering,” Universidad de los Andes -Biomedical Engineering, Bogotá-Colombia, 2018.
[6] “Engineering microscale magnetic devices for next-generation microrobotics,”, Universidad Central, Bogotá-Colombia, 2017.
[5] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes -Engineering department, Bogotá-Colombia, 2017.
[4] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes -Physics department, Bogotá-Colombia, 2017.
[3] “Engineering microscale magnetic devices for next-generation microrobotics,” Pontificia Universidad Javeriana, Bogotá-Colombia, 2017.
[2] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes, Pontificia Universidad Javeriana, Universidad del Quindio, Amenia-Colombia, 2017.
[1] “Why to do research in micro and nano? … and some examples,” Universidad del Quindio, Amenia-Colombia, 2016.
Patents and Inventions:
[3] P. G. Traynor, D. P. Arnold, W. N. Scaife, C. Peeters, C. Velez, “Detecting Counterfeit Magnetic Stripe Cards Using Encoding Jitter,” U.S. Patent Application US20180314862A1, filed May 1, 2017.
[2] D. P. Arnold, C. Velez, “Axisymmetric Electropermanent Magnets,” International Patent Application WO2018106935A2, filed December 7, 2017.
[1] D. P. Arnold, C. Velez, J Henriksson “Magnetic Force Mapping System,” Invention disclosure UF#16589, June 1, 2016.
[16] C. Velez, D. K. Patel, S. Kim, M. Babaei, C. R. Knick, G. L. Smith, and S. Bergbreiter, “Hierarchical Integration of Thin-Film NiTi Actuators using Additive Manufacturing for Microrobotics,” J-MEMS (Accepted – In print).
[15] M. Babaei, S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “Increasing the Energy Efficiency of NiTi Unimorph Actuators with a 3D-Printed Passive Layer,” J-MEMS (Submitted - Under review).
[14] S. Kim, C. Velez, R. St. Pierre, G. L. Smith, and S. Bergbreiter, “A Two-Step Fabrication Method for 3D Printed Microactuators: Characterization and Actuated Mechanisms,” J-MEMS, 2020 (Early Access).
[13] O. L. Lanier, C. Velez, D. P. Arnold, and J. Dobson, “Magnetic Particle Capture Device Model for Removal of Pro-Inflammatory Cytokines During Cardiopulmonary Bypass,” IEEE Transactions on IEEE Transactions on Biomedical Engineering (Submitted – Under review).
[12] C. Velez, S. Hwangbo, S. Chyczewski, J. Ewing, R. Bowrothu, C. Smith, Y.K. Yoon, and D. P. Arnold, “Screen-printed barium ferrite/samarium cobalt composites with tailorable ferromagnetic resonance,” IEEE Transactions on Microwave Theory and Techniques, special issue. Volume: 67, Issue: 8, Aug. 2019.
[10] C. Velez, R. E. Carroll, and D. P. Arnold, “Direct measurement and microscale mapping of nanoNewton to milliNewton magnetic forces,” AIP Adv., vol. 7, no. 5, pp. 56809-1-56809–6, May 2017.
[9] Z. Zhao, I. Torres-Díaz, C. Vélez, D. Arnold, and C. Rinaldi, “Brownian Dynamics Simulations of Magnetic Nanoparticles Captured in Strong Magnetic Field Gradients,” J. Phys. Chem. C, vol. 121, no. 1, pp. 801–810, 2017.
[8] A. Garraud, C. Velez, Y. Shah, N. Garraud, B. Kozissnik, E. G. Yarmola, K. D. Allen, J. Dobson, and D. P. Arnold, “Investigation of the capture of magnetic particles from high-viscosity fluids using permanent magnets,” IEEE Trans. Biomed. Eng., vol. 63, no. 2, pp. 372–378, 2016.
[7] C. Velez, I. Torres-Díaz, L. Maldonado-Camargo, C. Rinaldi, and D. P. Arnold, “Magnetic Assembly and Cross-Linking of Nanoparticles for Releasable Magnetic Microstructures.,” ACS Nano, vol. 9, no. 10, pp. 10165–72, Oct. 2015.
[6] S. Li, Y. Hwang, Y. Hsieh, L. Lei, F. Ren, S. J. Pearton, E. Patrick, M. E. Law, C. V. Cuervo, and D. J. Smith, “Enhancement of AlGaN / GaN high electron mobility transistors off-state drain breakdown voltage via backside proton irradiation,” J. Vac. Sci. Technol. B, vol. 32, no. 2, pp. 1–6, 2014.
[5] G. Yang, Y. Jung, C. V. Cuervo, F. Ren, S. J. Pearton, and J. Kim, “GaN-based light-emitting diodes on graphene-coated flexible substrates,” Opt. Express, vol. 22, no. S3, p. A812, Apr. 2014.
[4] L. Liu, C. Velez Cuervo, Y. Xi, F. Ren, S. J. Pearton, H.-Y. Kim, J. Kim, and I. I. Kravchenko, “Impact of proton irradiation on dc performance of AlGaN/GaN high electron mobility transistors,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 31, no. 4, p. 42202, 2013.
[3] E. Patrick, M. E. Law, L. Liu, C. Velez Cuervo, Y. Xi, F. Ren, and S. J. Pearton, “Modeling proton irradiation in AlGaN/GaN HEMTs: Understanding the increase of critical voltage,” IEEE Trans. Nucl. Sci., vol. 60, no. 6, pp. 4103–4108, 2013.
[2] Y.-H. Hwang, L. Liu, C. Velez, F. Ren, B. P. Gila, D. Hays, S. J. Pearton, E. Lambers, I. I. Kravchenko, C.-F. Lo, and J. W. Johnson, “GaN metal–insulator–semiconductor high-electron-mobility transistor with plasma enhanced atomic layer deposited AlN as gate dielectric and passivation,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 31, no. 5, p. 52201, 2013.
[1] X. Wang, C.-F. Lo, L. Liu, C. V. Cuervo, R. Fan, S. J. Pearton, B. Gila, M. R. Johnson, L. Zhou, D. J. Smith, J. Kim, O. Laboutin, Y. Cao, and J. W. Johnson, “193 nm excimer laser lift-off for AlGaN/GaN high electron mobility transistors,” J. Vac. Sci. Technol. B Microelectron. Nanom. Struct., vol. 30, no. 5, p. 51209, 2012.
Archival, Peer-Reviewed Conference Publications:
[11] S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “A Magnetically Transduced Whisker for Angular Displacement and Moment Sensing,” 2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Macau, November 4-8, China (in print).
[10] C. Velez, J. Ewing, S. Hwangbo, K. Sondhi, T. Schumann, Y.K. Yoon, and D. P. Arnold, “Low-temperature micropatterning of thick-film BaFe12O19 composites on semiconductor substrates for integrated millimeter wave devices,” 2018 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), Ann Arbor, MI, 2018, pp. 1-3.
[9] N. Scaife, C. Peeters, C. Velez, H. Zhao, P. Traynor and D. Arnold, "The Cards Aren't Alright: Detecting Counterfeit Gift Cards Using Encoding Jitter," 2018 IEEE Symposium on Security and Privacy (SP), San Francisco, CA, US., pp. 695-708.
[8] C. Velez, L. P. Tatum, B. Herstein, C. P. Becker and D. P. Arnold, “Batch-fabrication and characterization of miniaturized axisymmetric electropermanent magnets,” in 17th international conference on micro and nanotechnology for power generation and energy conversion applications (PowerMEMS), 2017, pp. 206-210.
[7] C. Velez and D. P. Arnold, “Microfabrication of Magnetically Attached End Effectors for Micro / Milli Robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp. 17-19.
[6] C. Velez, D. P. Arnold, Z. I. Gonzalez, and J. F. Osma, “Sub-millimeter Electropermanent Magnets for Microgrippers,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp. 20-22.
[5] A. Hsu, C. Cowan, W. Chu, B. Mccoy, A. Wong-foy, R. Pelrine, C. Velez, D. Arnold, J. Lake, J. Ballard, J. Randall, and A. D. L. Micro-robots, “Automated 2D Micro-Assembly Using Diamagnetically Levitated Milli-Robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2017, pp.160-165. BEST APPLICATION PAPER AWARD.
[4] C. Velez, I. Torres-Díaz, L. Maldonado-Camargo, C. Rinaldi, and D. P. Arnold, “Fabrication of patterned magnetic microstructures using magnetically assembled nanoparticles,” in The 28th IEEE International Conference on Micro Electro Mechanical Systems, 2015, pp. 964–967.
[3] C. Velez, W. C. Patterson, and D. P. Arnold, “Simulation and experimental validation of a selective magnetization process for batch-patterning magnetic layers,” in Journal of Physics: Conference Series, 2015, vol. 660, pp. 3–7.
[2] A. Garraud, B. Kozissnik, C. Velez, E. G. Yarmola, L. Maldonado-Camargo, C. Rinaldi, K. D. Allen, J. Dobson, and D. P. Arnold, “Collection of magnetic particles from synovial fluid using Nd-Fe-B micromagnets,” in Proc. Design, Test, Integration and Packaging of MEMS/MOEMS Symposium (DTIP 2014), 2014, pp. 97–102.
[1] C. Velez, L. F. Ariza, J. F. Osma, and A. Avila, “Velocity and pressure analysis for microchannel networks,” in 2010 IEEE Andescon, 2010, pp. 1–5.
Other Conference Abstracts/Presentations/Poster:
[18] C. Velez, D. K. Patel, S. Kim, M. Babaei, C. Knick, G. Smith, and S. Bergbreiter, “Combining micro fabrication and additive manufacturing for microrobotic mechanisms,” Hilton Head Workshop 2020: A Solid-State Sensors, Actuators and Microsystems Workshop, 2020 (Accepted - Oral).
[17] M. Babaei, S. Kim, C. Velez, D. K. Patel, and S. Bergbreiter, “Increasing the Work Efficiency of NiTi Unimorph Actuators,” Hilton Head Workshop 2020: A Solid-State Sensors, Actuators and Microsystems Workshop, 2020 (Accepted - Poster).
[16] C. Velez, S. Kim, M. Babaei, D. K. Patel, C. Knick, G. Smith, and S. Bergbreiter, “Rapid prototyping of microactuators by integrating 3D printed polymeric structures with NiTi thin film,” 33rd International Conference on Micro Electro Mechanical Systems, IEEE MEMS. Vancouver-Canada, 2020.
[15] C. Velez, R. E. Pelrine, and D. P. Arnold, “Batch-fabrication of diamagnetically levitated microrobots,” in Solid-State Sensors, Actuators and Microsystems Workshop, pp. 66-66 2018 (oral).
[14] A. Alfred, C. Falck, L. F. De Pina, D. Girard, D. Tansel, D. Tola, A. Weber, J. Williams, C. Velez, G. Walters, Y. Yoon, and T. Nishida, “Smart Lake- A Modular Internet-connected Water Quality Monitoring System,” in PRAGMA 32: Internet of people and things, 2017, BEST POSTER AWARD.
[13] C. Velez, C. Becker, and D. P. Arnold, “Investigation of axisymmetric sub-millimeter electropermanent magnets,” in PowerMEMS, 2016, p. 32611.
[12] C. Velez and D. P. Arnold, “Batch-fabrication of magnetically patterned bases for diamagnetically levitated micro-robots,” in International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 2016.
[11] O. L. Lanier, C. Velez, and J. Dobson, “Simulation of magnetic particle capture for extracorporeal magnetic separation of inflammatory cytokines for cardiopulmonary bypass (CPB) procedures,” in Biomedical Engineering Society annual conference, 2016.
[10] O. L. Lanier, C. Velez, and J. Dobson, “Magnetic nanoparticle capture simulation for extracorporeal separation of cytokines in blood,” in NanoFlorida, 2016.
[9] A. Garraud, C. Velez, Y. Shah, N. Garraud, B. Kozissnik, E. G. Yarmola, K. D. Allen, J. P. Dobson, and D. P. Arnold, “Analysis of Microscale Permanent Magnets for Capturing Magnetic Particles in Biological Fluids,” in Frontiers in BioMagnetic Particles, 2015. BEST POSTER AWARD
[8] C. Vélez, D. Cruz, J. C. Gonzalez, S. C. Medina, O. F. Sanchez, A. Avila, and J. F. Osma, “Size microcapsule separation using microfluidic systems,” in Ibersensor, 2014, p. 331.
[7] C. Velez, I. Torres-díaz, L. Maldonado-camargo, C. Rinaldi, and D. P. Arnold, “Fabrication of magnetic microstructures by in situ crosslinking of magnetically assembled nanoparticles,” in Solid-State Sensors, Actuators and Microsystems Workshop, 2014, no. c, pp. 331–334.
[6] K. A. Y. Shah, C. C. Velez, E. Yarmola, D. Arnold, J. Dobson, “Designing a probe for the magnetic collection of molecular biomarkers in joints for early detection of osteoarthritis,” in Biomedical Engineering Society Annual Meeting, 2014.
[5] C. Velez, L. Liu, F. Ren, S. J. Pearton, J. Kim, R. C. Fitch, D. E. Jr. Walker, K. D. Chabak, J. K. Gillespie, M. Kossler, M. Trejo, and A. Crespo, “Effects of Proton Irradiation on Reliability and DC Performances Of AlGaN/GaN High Electron Mobility Transistors,” in Florida Chapter of the AVS Science and Technology Society (FLAVS) 2013 Annual Joint Symposium & Exhibition, 2013.
[4] C. Velez, S. Silva, X. Wang, A. G. Mancera, C. Leidy, J. F. Osma, and F. Ren, “Comparison Techniques For Fabricating Microfluidic Four-Roll Mill On Glass Substrates,” in AVS 59th International Symposium & Exhibition, 2012.
[3] C. V. Cuervo, M. D. L. Teixeira, and D. Li, “Microneedle Based ECG – Glucose Sensor Design Proposal,” in NanoFlorida, 2010, p. 73644.
[2] J. M. Garz, J. Sebastian, M. Baquero, J. C. Ortiz, C. Velez, and J. F. Osma, “Manufacture of Aluminium Micromirrors on Glass,” in Third Colombian Meeting on Micro and Nano Technology, 2010, vol. 4, no. 1, p. 70403.
[1] D. M. Camacho, M. Ieee, C. Vélez, G. Yamhure, C. M. C, and J. A. Garcia, “Recomendaciones Para La Implementación Del Layout De Circuitos Monolíticos de Señal,” in IEEE Colombian Workshop on Circuits and Systems (CWCAS07), 2007, pp. 1–6.
Press Coverage:
[5] C. Velez, “CARRERA INGENIERÍA ELECTRÓNICA- Testimonio Camilo Vélez,” Youtube, https://www.youtube.com/watch?v=PBFKAq_SO_g&t=1s , August 3, 2018.
[4] C. Velez, “Young Professionals: Reflections from EDS Young Professionals,” Electron Devices Society Newsletter, vol. 25, no. 2, pp. 28, 2018.
[3] C. Velez, “Microrobots and science fiction” Laud 90.4 FM stereo, Bogotá-Colombia September 17, 2017.
[2] C. Velez, “Engine machine – Micro-nano robots” UFM stereo, Armenia-Colombia September 1, 2017.
[1] C. Velez, “Young Professionals: Reflections from EDS Young Professionals,” Electron Devices Society Newsletter, vol. 23, no. 4, pp. 24–25, 2017.
Invited Presentations:
[11] “Engineering next-generation microrobotic,” University of California Irvine, Irvine, CA - USA, 2020 (Invited seminar).
[10] “Fundamentals of microrobotics and magnetic manipulation at small scale,” 2nd Colombian School on Magnetism and Magnetic Materials, Bogotá-Colombia, 2019 (Tutorial session).
[9] “Magnetism in the world of insect-size robots,” 2nd Colombian School on Magnetism and Magnetic Materials, Bogotá-Colombia, 2019 (Invited speaker).
[8] “Alternative approaches for magnetic locomotion at microscale,” Carnegie Mellon University – Locomotion Seminar, Pittsburgh-USA, 2019.
[7] “The importance of magnetic microrobots in bioengineering,” Universidad de los Andes -Biomedical Engineering, Bogotá-Colombia, 2018.
[6] “Engineering microscale magnetic devices for next-generation microrobotics,”, Universidad Central, Bogotá-Colombia, 2017.
[5] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes -Engineering department, Bogotá-Colombia, 2017.
[4] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes -Physics department, Bogotá-Colombia, 2017.
[3] “Engineering microscale magnetic devices for next-generation microrobotics,” Pontificia Universidad Javeriana, Bogotá-Colombia, 2017.
[2] “Engineering microscale magnetic devices for next-generation microrobotics,” Universidad de los Andes, Pontificia Universidad Javeriana, Universidad del Quindio, Amenia-Colombia, 2017.
[1] “Why to do research in micro and nano? … and some examples,” Universidad del Quindio, Amenia-Colombia, 2016.
Patents and Inventions:
[3] P. G. Traynor, D. P. Arnold, W. N. Scaife, C. Peeters, C. Velez, “Detecting Counterfeit Magnetic Stripe Cards Using Encoding Jitter,” U.S. Patent Application US20180314862A1, filed May 1, 2017.
[2] D. P. Arnold, C. Velez, “Axisymmetric Electropermanent Magnets,” International Patent Application WO2018106935A2, filed December 7, 2017.
[1] D. P. Arnold, C. Velez, J Henriksson “Magnetic Force Mapping System,” Invention disclosure UF#16589, June 1, 2016.
References
Prof. Sarah Bergbreiter
Professor, Dept. of Mechanical Engineering - Carnegie Mellon University
Prof. David P. Arnold
George Kirkland Engineering Leadership Professor, Dept. of Electrical and Computer Engineering - University of Florida
Prof. Fan Ren
Distinguished / Fred and Bonnie Edie Professor, Dept. of Chemical Engineering - University of Florida
Prof. Johann F. Osma Cruz
Associate Professor, Dept. of Electric and Electronics Engineering - Universidad de los Andes
Dr. Fernando Guarin
Distinguished Member of Technical Staff at Global Foundries / President EDS - IEEE
Prof. Carlos Rinaldi
Department Chair and Dean's Leadership Professor, Chemical Engineering Dept. - University of Florida
Prof. Jon Dobson
Professor, J. Crayton Pruitt Family Dept. of Biomedical Engineering - University of Florida
