R. Velmurugan

Bio: R. Velmurugan is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Nanomaterials & Carbon. The author has an hindex of 1, co-authored 1 publications receiving 5 citations.

Experimental characterisation of catalyst-free carbon nanomaterials from mixed vegetable and animal base oils through modified traditional process

Abstract: A new process for the preparation of catalyst-free pure carbon nanomatereials is described here. These nanomaterials are then experimentally investigated. The process is simple and traditional so that the operator can have full control over the flame geometry and oil consumption in a span of time. A slight modification is carried out in the traditional process with an option of external heating (forced convection). Two types of samples are prepared (S1 & S2) from two different processes, Modified Traditional Process without external heating (MTP1) and with external heating (MTP2). Deep investigation on yield, morphology and structure of prepared samples are carried out by sophisticated analytical instruments. It is noted that the S1 sample contains pure carbon nano crystals along with well grown thin nano tubular structures whereas S2 sample contains pure carbon nanocrystals in a chain formation and likely possibility for the growth of nanotubes without any further treatment. It is observed clearly that the average weight gain of sample S2 is 22% for MTP1 and 7% for MTP2 more than that of the sample S1 over the same period of time. The range in dimension of the nanoparticles is varying from 6-45 nm.

Performance of two phase gravity assisted thermosyphon using nanofluids

Abstract: The recent pioneering advancement in the use of nanofluids as the working fluid in the two phase gravity assisted thermosyphon (TPGAT) significantly improved the heat transfer performance. In the present study, the performance enhancement of TPGAT using carbonaceous and metal based nanofluid as the working fluid is investigated. The experiment are conducted at various heat input in the evaporator and at different fill ratios. The results of the experiments revealed that the nanoparticles play a major role in enhancing the performance by bombarding the formation of vapour bubbles in the evaporator section. It is also found that the fill ratio has varying role in the condenser and evaporator section at various heat input of

Synthesis of carbon nanoparticles from vegetable oil by flame deposition

Abstract: Although different methods for synthesising carbon nanostructures are available, research is still going on for finding the cheap and easy method for commercial preparation of different carbon nanostructures with controlled moiphology and high purity. The carbon soot obtained from burning of vegetable oils and animal based oils by using traditional method is found to contain carbon nanostructures including single-walled carbon nanotubes, multi- walled carbon nanotubes and carbon nanofibers. Carbon soot obtained by burning oils has been used as 'kajal' since ancient times. Kajal is easy-to-make by traditional method of flame deposition. It has been. found to contain carbon nanomaterials. Thus, synthesis of carbon nanostructures from vegetable oil using flame deposition method is studied in detail in regard to find a cheap source and easy method.

Synthesis of Carbon Nano Materials from Carbohydrate Rich Biogenic Precursors using Chemical Vapor Deposition Method and Optimization of Parameters by Taguchi Optimization Method

Abstract: Carbon Nano Materials (CNM) from biogenic carbohydrate rich non-edible precursors such as Syzygium cumini (Jamun), Tamarindus indica (Imli) and Litchi chinensis (Imli) seeds were synthesized by chemical vapour deposition method (CVD). Parameters were optimized by Taguchi optimization method, four parameters such as precursor, temperature, carrier gas and duration and three levels S. cumini, T. indica and L. chinensis as a precursor, Argon (Ar), Nitrogen (N2) and Hydrogen (H2) as a carrier gas, 1 hour (hr), 2 hours and 3 hours (hrs) for duration of pyrolysis, 800C, 900C and 1000C for temperature were selected. In the present work, impact of precursor is 35.84% which is the most effective factor than temperature (29.59%) and other parameters such as duration (19.50%) and the least effective factor is carrier gas (15.07%). Impact of parameter on the yield which described by the deviation of signal to noise (S/N) ratio. The result of deviation of S/N ratio shows T. indica seed (precursor), 900C (temperature), 2 hr (duration) and Ar (carrier gas) are the best parameters. The morphology of CNM is studied by SEM characterization and the nature of synthesized CNM by RAMAN spectroscopy.