Kalpit Pundlik Kaurase
@tgpcet.com
Assistant Professor and Head of Department
Tulsiramji Gaikwad-Patil College of Engineering and Technology, Nagpur
RESEARCH INTERESTS
Bionanocomposites, Rocket Propulsion, Aerodynamics
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Kalpit P. Kaurase and Dalbir Singh
MAFTREE
Cellulose is one of the most frequently used and generally available materials on Earth and has been utilized for ages in a variety of applications. Numerous researchers have investigated various lignocellulosic sources for the extraction of cellulose and the author has introduced a new source for the extraction of cellulose and cellulosic nanofibers: fruits or seedpods of Delonix Regia (CNF). The solvent casting process is used to create the PVA/CNF composite after the cellulose and CNF have been removed using a mechano-chemical method. SEM, tensile testing, soil burial testing and moisture absorption tests have all been used to examine the morphological, mechanical, biodegradable and moisture absorption capabilities of pure PVA and PVA/CNF composite with 1, 3, 5, 7 and 9 percentages of CNF. According to SEM findings, agglomeration was seen at higher concentrations but uniform and homogenous distribution of nano-fillers was seen at lower percentages of CNF. It is profusely clear from the results of the tensile tests that the percentage elongation initially decreased and then began to increase at higher concentration, while the Young’s modulus and tensile strength initially increased at lower percentages of CNF rapidly and gradually decreased for higher concentration. Pure PVA had the least resistance to degradation in biodegradability test, while the biodegradability test showed that the inclusion of CNF decreased the composite material’s ability to degrade. With the addition of CNF, the rate of moisture absorption decreased, resulting in a PVA/CNF composite material that will last longer and perform better without material degradation.
K.P. Kaurase and D. Singh
MAFTREE
Lignocellulosic fibres have acquired prominence over past few years among researchers due to its prevalence in nature, biodegradability and high specific strength, among other factors. In this paper, mechanochemical route is used to obtain cellulosic nano fibres (CNF) from raw Delonix Regia fruits. CNFs are extracted with chemical treatments including alkali treatment, bleaching, acid hydrolysis and mechanical treatment including ball milling, centrifugation and high speed homogenization. Characterization of the material produced is carried out using X-Ray Diffraction (XRD), Thermo-Gravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FTIR) and Nano Particle Size Analyzer (NPA). XRD results showed that the crystallinity index (CrI) improved from 52.24% to 73.59% for extracted cellulose whereas it got reduced slightly to 68.31% for CNF samples and the crystallite size extracted cellulose and CNF was estimated to be 6.9 nm and 5.1 nm respectively. TGA results proved that the extracted cellulose and CNF are thermally stable compared to raw DRFF samples. First degradation in TGA started near 70-80C which represents moisture loss. Second degradation temperature improved for cellulose and CNF from 173.6C for DRFF to 223.4C and 246.1C which showed improvement in thermal stability. Major weight loss in second degradation shifted from 298.3C to 346.8C and 348.5C for cellulose and CNF respectively. Ash content was slightly decreased for CNF and cellulose samples compared to DRFF. Typical characteristic IR bands of cellulose were observed at 3400 cm-1, 2800-2900 cm-1, 1643.6 cm-1,1447 cm-1, 1084.6 cm-1 and 673.8 cm-1 of O-H stretching vibrations, C-H stretching, O-H bending, CH2 bending of pyranose ring, C-O-C pyranose ring vibration and O-H out-of-plane bending respectively in extracted cellulose and CNF samples. Improvement in cellulose content was observed from FTIR results and found suitable for application in composite materials. The average particle size of CNF measured by NPA was 247.3 nm proving the abundance of material at nanoscale. The average zeta potential of CNF was estimated at -50 mV with negative sign representing hydroxyl group. From the results of zeta potential measurement, material was found to be electro-statically stable and can be utilized for nanocomposite fabrication.
Kalpit P. Kaurase and Dalbir Singh
Springer Singapore
Kalpit P. Kaurase and Dalbir Singh
Trans Tech Publications, Ltd.
Lignocellulosic fibers have attracted the attention of researchers, academicians and industries in recent years. These fibers have several advantages as compared to conventionally used fibers such as availability in abundance in nature as it can be extracted from almost every plants, biodegradability, environmental friendliness, high specific strength, etc. Cellulose content of fiber depends on the chemical constituents of the source plant from which it is extracted hence it becomes necessary to understand the constituents of lignocellulosic fibers before its application. In this paper, a new source (Delonix Regia Fruit) of cellulosic fibers has been evaluated and chemical constituents of Delonix Regia fruit fiber has been compared with several lignocellulosic plant fibers. Also, Delonix Regia Fruit fibers are presented as a new source of cellulose and Chemical methods are used for extraction of cellulose from it. Chemically Treated and untreated fibers are characterized by Fourier Transform Infrared Spectroscopy (FT-IR) and Thermo Gravimetric Analysis (TGA) to understand the effect of chemical treatment, properties of the cellulose yield. From the results compositional analysis it can be seen that Delonix Regia fruit fibers have 66.9% cellulose content which is very high as compared to most of the popular sources which makes it suitable and cost effective to extract cellulose from it and can be used in biocomposites and bionanocomposites. Analysis of FT-IR spectra of untreated and chemically treated Delonix Regia Fruit Fibers revealed the removal of hemi-cellulose and lignin by chemical treatments followed. TGA-DTG results proved that highly purified yield of cellulose is successfully extracted by the chemical route followed.
Brijesh Patel, Kalpit P. Kaurase, and Anil M. Bisen
Trans Tech Publications, Ltd.
Design of Turbo machinery is complex and efficiency is directly related to material performance, material selection is of prime importance. Temperature limitations are the most crucial limiting factors to gas turbine efficiencies. This paper presents the life of GTD 111 applied to gas turbine blade based on LCF and TMF test results. The LCF tests were conducted under various strain ranges based on gas turbine operating conditions. In addition, IP (in-phase) and OP (out of-phase) TMF tests were conducted under various strain ranges. The paper will focus light on above issues and each plays an important role within the Gas Turbine Material literature and ultimately influences on planning and development practices. It is expected that this comprehensive contribution will be very beneficial to everyone involved or interested in Gas Turbines.