Browsing by Author "Singh, Amit Kumar"

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    Multimodal propulsion of synthetic microbots
    (2018) Singh, Amit Kumar
    The recent quest for miniaturization has inspired researchers to design and develop micro or nanorobots suitable for multifarious applications. The present thesis reports the fabrication of a host of micromotors composed of iron nanoparticles (FeNPs) aggregates, FeNPs coated on polymeric materials, paper, and agglomerates of pollutant carbon soot. These fabricated micromotors were employed for pH sensing, cargo transport, hydrogen generation and water detoxification applications. The Chapter 1 introduces the general introduction and basic concepts related to the self-propulsion of synthetic micro/nanoswimmers. The Chapter 2 reports a controlled migration of an iron nanoparticle (FeNP) coated polymer micromotor. The self-propulsion owing to the asymmetric catalytic decomposition of peroxide fuel was directed through a pH gradient imposed across the motor-surface, while the magnetic field induced an external control on the movement and the speed of the motor. The Chapter 3 demonstrates the design and development of a self-propelling ferrobot composed of a collection of iron nanoparticles (FeNPs). While the propulsive thrust required for the chemotactic migration of the ferrobots was generated through the ejection of hydrogen bubbles due to the reaction of aqueous formic acid (FA) with FeNP clusters on the motor surface, presence of ferromagnetic FeNPs assured “on-the-fly” remote guidance using an external magnetic field. The experiments uncovered the potential of the proposed ferrobots not only for the on-demand power supply to the portable devices but also as a single-step commercial process to produce pure hydrogen under ambient condition and devoid of greenhouse gas emission. In the Chapter 4, the self-propulsion of paper-based microjets, namely paperbots has been explored, which has multimodal chemical and magnetic controls on the motion. The Chapter 5 shows fabrication of multifunctional chemically-powered carbon soot-based microbots, namely CARBOts, by heterogeneous deposition of catalytic platinum (Pt) and magnetic nickel (Ni) nanofilms on the airborne contaminant carbon soot (CS) for environmental remediation. These magneto-catalytic CARBOts demonstrated efficient catalytic degradation of methylene blue (MB) dye in the presence of 10% (v/v) H2O2 fuel under ambient conditions. The intrinsic oleophillic nature of the CARBOts facilitated successful oil-motor interaction, which led to efficient on-the-fly capturing of oil droplets. The Chapter 6 concludes with the thesis summary and a concise discussion on the future prospects of micromotors discussed in this thesis work.
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    Reference Flux Linkage Selection and its Impact on Direct Torque Control Based Induction Motor Drive Performance
    (2021) Singh, Amit Kumar
    In recent years, the rise in developing nations’ economic activities has resulted in the rapid expansion of cities. This expansion of cities has emanated an increase in vehicular traffic, which has led to deterioration in air quality. Air quality deterioration is mainly because of the emission from internal combustion engine vehicles, which shared nearly 20-25% of the total air pollution. To address the problem of unprecedented air pollution caused by the internal combustion engine-based vehicle, governments worldwide have launched various programs, policies, and incentives to increase penetration of vehicles that are not fossil fuel-based. One of the acceptable solutions is to shift electricity-based transportation, i.e., adaptation of electric vehicles (EVs). The major challenge in the faster adoption of EVs is to develop affordable electric vehicles that fulfill the need of the market and mass users. One possible way to accomplish these targets is to develop an efficient and low-cost drivetrain, apart from high-capacity batteries, in a short span of time. To develop an EV drivetrain in reduce time, it is essential to adapt the available speed control methods proposed for industrial applications to modify for use in electric vehicles. In this thesis work, such an adaptation is presented for an EV drive with direct torque control (DTC) of induction motor (IM).