|Description||2019 Spring Physics Colloquium Series|
Orlando Auciello, Ph.D.
Endowed Chair of Engineering
Professor, Materials Science and
Engineering and Bioengineering Departments
University of Texas-Dallas
Science and Technology of Multifunctional/Biocompatible Ultrananocrystalline Diamond (UNCDTM) to Microcrystalline Diamond (MCD) Coatings and Applications to a New Generation of High-Tech Electronics and Implantable Medical Devices
For more information contact: Dr. Anzhong Wang 254-710-2276
New paradigms in the research and development of nanocarbon thin films are providing the bases for new physics, materials science, chemistry, and biological processes, impacting a new generation of multifunctional high-tech and biomedical devices. This talk will focus on discussing the science and technology of a new paradigm material named ultrananocrystalline diamond (UNCDTM), nanocrystalline diamond (NCD) and microcrystalline diamond (MCD) all in thin film form and their integration into new generations of high-tech and external and implantable medical devices, as described below: UNCD films co-developed and patented by O. Auciello and colleagues are synthesized by novel microwave plasma chemical vapor deposition and hot filament chemical vapor deposition techniques using an Ar-rich/CH4 chemistry that produces diamond films with the smallest gran size demonstrated today (2-5 nm). The fundamental science underlying the synthesis and properties of the UNCD films and applications to devices will be discussed. The UNCD films exhibit the lowest friction coefficient (0.02-0.04) compared with metals (≥ 0.5) currently used in many prostheses (e.g., hips, knees), electrically conductive UNCD coatings with nitrogen in grain boundaries can enable a new generation of neural electrodes, UNCD coatings are extremely biocompatible, and have been demonstrated to provide superior scaffolds for embryonic cell growth and differentiation. Original Biomedical Implants (OBI-USA) and OBI-México, founded by Auciello and colleagues, are developing new generations of high-tech diamond-based electronics and implantable medical devices based on multifunctional/biocompatible UNCD to MCD coatings, described in order of less to highest development until now, namely: a) new generation of high-power diamond film-based electronics; b) Brain neurons functionalized UNCD-coated polymer with tailored stiffness, enabling next generation less invasive electrodes for neural stimulation c) UNCD-based MEMS cantilevers demonstrated as high sensitivity biosensors; d) UNCD-based MEMS cantilevers powered by biting heart cells to power new generation defibrillator/pacemaker, eliminating battery power; e) new generation of Li-ion batteries with ≥ 10x longer life and safer, using UNCD-based electrodes, membranes and inner wall battery case, enabling next generation defibrillator/pacemakers and implantable and external power generation devices with order of magnitude longer battery powered life; f) new generation of implantable prostheses (e.g., dental implants (in clinical trials in humans), hips, knees, stents and more) coated with UNCD, eliminating failure of current metal-based implants due to synergistic mechanical wear or blood interaction / chemical corrosion by body fluids; g) Integrated UNCD-coated magnet outside the eye, creating magnetic field to attract biocompatible superparamagnetic FeO2 nanoparticles injected inside the eye to push detached retina to place, enabling revolutionary retina reattachment; h) A key medical device where UNCD coating has made an impact is a UNCD-coated silicon based microchip implantable inside the eye as a key component of the artificial retina to return partial vision to people blinded by genetically-induced degeneration of photoreceptors (a device named Argus II is currently in the market by Second Sight, returning partial vision to people blinded by retinitis picmentosa).