Vishal Musaramthota, Ph.D.

This paper presents an experimental study in which 30-nm CoFe2O4–BaTiO3 core–shell magnetoelectric nanostructures (MENs) were embedded into graphite sheets to enable external control of intrinsic properties such as the intercalation process. The embedded nanoparticles were self-assembled into a honeycomb pattern with a characteristic period on the order of 200 nm, as confirmed through energy-dispersive spectroscopy (EDS) by scanning electron microscopy (SEM) as well as through atomic and… Show more

This paper presents an experimental study in which 30-nm CoFe2O4–BaTiO3 core–shell magnetoelectric nanostructures (MENs) were embedded into graphite sheets to enable external control of intrinsic properties such as the intercalation process. The embedded nanoparticles were self-assembled into a honeycomb pattern with a characteristic period on the order of 200 nm, as confirmed through energy-dispersive spectroscopy (EDS) by scanning electron microscopy (SEM) as well as through atomic and magnetic force microscopy (AFM and MFM). Integration of the nanoparticles into the graphite structure was also confirmed through Fourier transform infrared (FT-IR) imaging and X-Ray diffraction (XRD) analysis. XRD measurements indicate crystallographic changes in the response to application of a 500-Oe magnetic field. M-H measurements by vibrating sample magnetometer (VSM) showed the coercivity of the nanoparticles on the order of 250 Oe. Show less

CNTs can have the ability to act as compliant small-scale springs or as shock resistance micro-contactors. This work investigates the performance of vertically-aligned CNTs (VA-CNTs) as micro-contactors in electromechanical testing applications for testing at wafer-level chip-scale-packaging (WLCSP) and wafer-level-packaging (WLP). Fabricated on ohmic substrates, 500-μm-tall CNT-metal composite contact structures are electromechanically characterized. The probe design and architecture are… Show more

CNTs can have the ability to act as compliant small-scale springs or as shock resistance micro-contactors. This work investigates the performance of vertically-aligned CNTs (VA-CNTs) as micro-contactors in electromechanical testing applications for testing at wafer-level chip-scale-packaging (WLCSP) and wafer-level-packaging (WLP). Fabricated on ohmic substrates, 500-μm-tall CNT-metal composite contact structures are electromechanically characterized. The probe design and architecture are scalable, allowing for the assembly of thousands of probes in short manufacturing times, with easy pitch control. We discuss the effects of the metallization morphology and thickness on the compliance and electromechanical response of the metal-CNT composite contacts. Pd-metallized CNT contactors show up to 25 μm of compliance, with contact resistance as low as 460 mΩ (3.6 kΩ/μm) and network resistivity of 1.8 × 10−5 Ω cm, after 2500 touchdowns, with 50 μm of over-travel; they form reproducible and repeatable contacts, with less than 5% contact resistance degradation. Failure mechanisms are studied in-situ and after cyclic testing and show that, for top-cap-and-side metallized contacts, the CNT-metal shell provides stiffness to the probe structure in the elastic region, whilst reducing the contact resistance. The stable low resistance achieved, the high repeatability and endurance of the manufactured probes make CNT micro-contacts a viable candidate for WLP and WLCSP testing. Show less

The book covers a number of topics; the Overview of the Caribbean Diaspora, Enhancing Development through Diaspora Engagement, TheRole of Hometown Associations, Identity Issues in the Caribbean Diaspora Experience, The Lived Experience, Diaspora Policy and Practice Lessons from Another Diaspora Experience. My contribution is with Dr. Norman Munroe (my mentor) in Chapter 10 i.e. Deepwater Exploitation of Oil & Natural Gas - A Roadmap for Technical Assistance.
Please feel free to check out… Show more

The book covers a number of topics; the Overview of the Caribbean Diaspora, Enhancing Development through Diaspora Engagement, TheRole of Hometown Associations, Identity Issues in the Caribbean Diaspora Experience, The Lived Experience, Diaspora Policy and Practice Lessons from Another Diaspora Experience. My contribution is with Dr. Norman Munroe (my mentor) in Chapter 10 i.e. Deepwater Exploitation of Oil & Natural Gas - A Roadmap for Technical Assistance.
Please feel free to check out and reach out to Dr. Munroe for any questions. Show less