Ravi Hadimani

Richmond startup develops drone system to help monitor power transmission lines

Richmond Times-Dispatch  print

2019-10-25

“It is the perfect example of how students can get interested in something and start their own company,” said Ravi L. Hadimani, an assistant professor of mechanical and nuclear engineering at VCU who taught Beiro mechatronics and advised him on his independent studies project.

Energy harvesting fibre invented at University of Bolton

BBC  online

2010-06-28

BBC coverage on energy harvesting fibre

FLEXIBLE APPROACH TO ENERGY HARVESTING

Materials World (The Institute of Materials, Minerals and Mining)  online

2011-01-01

Media Coverage on energy harvesting fibre that I developed and patented

The Future - made in Bolton

The Bolton News  print

2010-10-30

Media Coverage on energy harvesting fibre that I developed and patented

Smart material to generate energy from the elements

Energy Harvesting Journal  print

2010-11-09

Media Coverage on energy harvesting fibre that I developed and patented

A renewable energy generator for all seasons

New Scientist  print

2011-06-01

On the development of hybrid piezoelectric and photovoltaic fiber and film

University of Bolton scientists create smart material generate energy from the elements

Scientific American  print

2011-06-01

On the development of hybrid piezoelectric and photovoltaic fiber and film

Non-invasive Neuromodulation

Transcranial Magnetic Stimulation (TMS) is promising neuromodulation technique which alters the neuronal functions when time-varying short pulses of the magnetic field induce an electric field in the brain. This has been used to treat depression and is currently FDA approved. Commercial TMS coils produce non-focused cortical stimulation, however, many neurological disorders such as Parkinson’s disease and Post-Traumatic Stress Disorder (PTSD) originate from deeper regions middle of the brain. In deep-brain stimulation, accurate calculation of electric field requires detailed information about the structure and electrical properties of various tissues in the brain. This calculation of electric field in the brain is normally done with a homogeneous head model which is not adequately realistic.

Biomagnetic Materials

Magnetic nanoparticles have gained tremendous attention due to their ability to navigate through the body and vary the physical properties of the tissues of interest. We have designed a technique to produce gadolinium based nanoparticles that are ferromagnetic at room temperature which can increase the MRI quality significantly. These particles can also be used in hyperthermia and targeted drug delivery

Magnetocaloric Microcooling

We are interested in developing thin films of rare-earth magnetocaloric and magnetoelastic materials. Thin films of magnetocaloric materials have the potential to be used in cooling the integrated circuits that can reduce the heating effects in high density microchips. Magnetocaloric thin films can also be used in various MEMS applications and in the read head in hard disk drives to lower the temperature of the magnetic heads and thus increase the saturation magnetization above the current limit of 2.4 tesla. Fabrication of thin films of these materials are best achieved by femto second pulsed laser deposition (PLD). In the development of these thin films by femto second PLD, various unknown meta-stable magnetic phases have been observed. These phases need to be identified and characterized. The properties of these phases can be tailored to enhance the magnetocaloric effect and magnetoelastic effect by PLD parameters. Classical characterization techniques such as EDS and XRD fail to determine the accurate composition and crystal structure of the films. Advanced techniques such as Auger Spectroscopy and TEM should be used to analyze these films.

Piezoelectric Energy Harvesting

With the ever-increasing need for energy, more non-conventional energy harvesting techniques are needed. Energy can be harvested from wind, rain and other sources of mechanical energy using piezoelectric material devices. Polymer piezoelectric films have shown to produce higher energy compared to the classical ceramic piezoelectric materials from wind and rain. I was the primary researcher of a team that invented a hybrid piezoelectric and photoelectric energy harvester which was capable of harvesting energy from sun, wind and rain. This invention was awarded the UK Energy Innovation Award in 2011 which was published in various news articles such as BBC, New Scientist, Scientific America, etc. I have also developed and patented piezoelectric polymer fiber that can be weaved or knitted into energy harvesting fabric. The piezoelectric films can also act as substrates for photovoltaic cells and generate power using wind and rain energy in the absence of solar energy. I have developed and patented a hybrid photovoltaic and piezoelectric energy harvesting device that can continually harvest energy from multiple natural sources of energy such as sun, wind and rain. Our long term goal in Piezoelectric Energy Harvesting field is to improve the polarization of PVDF fiber and to develop a fully functional garment that is capable of harvesting energy from wind and other mechanical vibrations.

Piezoelectric Polymer Element and Production Method and Apparatus

PCT/GB2011/05173423-Mar-2012.

2012-03-01

Hybrid Energy Conversion Device

PCT/GB2011/05182906-Apr-2012

2012-04-02

Optimization of thermal spray coating using sensors: magnetic

Commonwealth Center for Advanced Manufacturing

2016-10-01

Optimization of thermal spray coating using sensors: magnetic

On-chip studies of neuron cells under magnetic field stimulation

National Science Foundation

2016-06-01

On-chip studies of neuron cells under magnetic field stimulation

BT3-Biological Technologies-Life Sciences Research Tool

National Science Foundation

2016-06-01

It is an STTR grant from NSF in collaboration with National Standards and Technology (NIST)

IRES: US/UK Multidisciplinary Collaboration in Magnetics

National Science Foudnation

2014-05-01

RES: US/UK Multidisciplinary Collaboration in Magnetics

Mechanical and Nuclear Engineering Materials EGMN 604

Mechanical and Nuclear Engineering Materials

Mechatronics EGMN 416

Mechatronics

Robotics EGMN 427

Robotics with a focus on industrial manipulators

Computational analysis of transcranial magnetic stimulation in the presence of deep brain stimulation probes

American Institute of Physics Advances (AIP Advances)

2017-01-11

Transcranial Magnetic Stimulation is an emerging non-invasive treatment for depres- sion, Parkinson’s disease, and a variety of other neurological disorders. Many Parkin- son’s patients receive the treatment known as Deep Brain Stimulation, but often require additional therapy for speech and swallowing impairment. Transcranial Mag- netic Stimulation has been explored as a possible treatment by stimulating the mouth motor area of the brain. We have calculated induced electric field, magnetic field, and temperature distributions in the brain using finite element analysis and anatom- ically realistic heterogeneous head models fitted with Deep Brain Stimulation leads. A Figure of 8 coil, current of 5000 A, and frequency of 2.5 kHz are used as simula- tion parameters. Results suggest that Deep Brain Stimulation leads cause surrounding tissues to experience slightly increased E-field (∆Emax =30 V/m), but not exceed- ing the nominal values induced in brain tissue by Transcranial Magnetic Stimulation without leads (215 V/m). The maximum temperature in the brain tissues surround- ing leads did not change significantly from the normal human body temperature of 37 ◦C. Therefore, we ascertain that Transcranial Magnetic Stimulation in the mouth motor area may stimulate brain tissue surrounding Deep Brain Stimulation leads, but will not cause tissue damage.

Enhancement of beta phase in PVDF films embedded with ferromagnetic Gd5Si4 nanoparticles for piezoelectric energy harvesting

American Institute of Physics Advances (AIP Advances)

2017-01-04

Self-polarized Gd5Si4-polyvinylidene fluoride (PVDF) nanocomposite films have been synthesized via a facile phase-inversion technique. For the 5 wt% Gd5Si4-PVDF films, the enhancement of the piezoelectric β-phase and crystallinity are confirmed using Fourier transform infrared (FTIR) spectroscopy (phase fraction, Fβ, of 81% as compared to 49% for pristine PVDF) and differential scanning calorimetry (crystallinity, ∆Xc, of 58% as compared to 46% for pristine PVDF), respectively. The Gd5Si4 magnetic nanoparticles, prepared using high-energy ball milling were characterized using Dynamic Light Scattering and Vibrating Sample Magnetometry (VSM) to reveal a particle size of ∼470 nm with a high magnetization of 11 emu/g. The VSM analysis of free-standing Gd5Si4-PVDF films revealed that while the pristine PVDF membrane shows weak diamagnetic behavior, the Gd5Si4-PVDF films loaded at 2.5 wt% and 5 wt% Gd5Si4 show enhanced ferromagnetic behavior with paramagnetic contribution from Gd5Si3 phase. The interfacial interactions between Gd5Si4 and PVDF results in the preferential crystallization of the β-phase as con-firmed via the shift in the CH2 asymmetric and symmetric stretching vibrations in the FTIR. These results confirm the magnetic Gd5Si4 nanoparticles embedded in the PVDF membrane lead to an increased β-phase fraction, which paves the way for future efficient energy harvesting applications using a combination of magnetic and piezoelectric effects.

For full list of publications

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