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Some notable experiments of graphene

Publication Date : 08/11/2021

Author(s) :

RANJAN K SAHU.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

Graphene is an allotrope of carbon where carbon atoms are attached dimensional through sp? hybridization in a (2D) plane. Based on the structure, graphene can be visualized as a single sheet of graphite. A. fm and K. Novoselov successfully isolated free standing monolayer graphene from graphite by scotch tape method for the first time in 2004. This discovery won them the Nobel Prize in physics 2010. However, several fincention experiments had been carmied out much before its birth by other eminent scientists. In fact, several extended experiments have been pertormed to understand the properties of graphene after its discovery. This article is a collection of some of the notable pre and post-discovery experiments. In addition, it includes some of the experiments those have been carried out at CSIR-NML.


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2


Recent advances in photodetection applications of two dimensional MoS2 nanostructures

Publication Date : 08/11/2021

Author(s) :

BISHNU PADA MAJEE, ASHISH KUMAR MISHRA.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

Two-dimensional transition metal dichalcogenides (TMDs) with unique properties have received a oreat attention of scientific community in recent years. Among the TMDs established as an intriguing building block for the next generation optoclectronifcasm, isluyc, hM aso Sp, hohtaosdebteeecntoarslr. eTadhye optoelectronic device performance of TMDs are known to be layer dependent. The MoS, shows excellent light absorption and is found stable in natural environment, which make it suitable for optoelectronic devices. In the present review article, we discuss different synthesis processes for 2D-MoS, and have summarized few important studies on the photodetection application of different morphologies of Mos, nanostructures. Here, we discuss the different MoS, based photodetectors comprising of p-n junction photodiode and the metal-semiconductor-metal (MSM) junction.


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12


Prospective of titania based photocatalyst for environmental reduction reactions

Publication Date : 08/11/2021

Author(s) :

TRILOCHAN MISHRA.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

In the last two decade photocatalysis is widely studied so as to evolve a green chemical rout to deal with he environmental and energy problem faced by the mankind. Among all the studied photocatalysts anatase Ti0, mmo st attractive even today though limited to UV light absorption in pure form. However, easy availability, high aqueOouus stability and nontoxic nature attracted the researchers to heen made by number of researcher go for different possible modifications. Effort has to modify titania through metal, nonmetal doping and mixing with other oxides 1s and sulphides to engineer the band gap, band potential and delay the charge separation through Z-scheme and hetero-junction formation so as to achieve the goal of producing stable and highly active photocatalyst for energy and environmental application. In recent past, various strategies have been tried to extend the solar light absorption from visible to NIR range by using appropriate material so as to ultimately promote the solar photocatalytic Derformance of Tio, based composites. Keeping these in view, present review will discuss the past and present development in the area of material modification to deal with band gap engineering, heterojunction formation, required porosity, powder catalyst separation and better charge separation with special objective of improved environmental reduction reactions. In addition future prospect of these materials has been discussed in details for new generation researchers. In particular material based on MOFs, two dimensional materials and metal halide perovskites based titania composites are emphasized for future evaluation to address both air and water pollution.


No. of Downloads :

5


Spectroscopic Changes in conventional magnetorheological fluid and graphene oxide Spectroscopic agnetorheological fluid with combustion method

Publication Date : 08/11/2021

Author(s) :

KUNAL SINGH BISHT, KAVERI SAH.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

A comparative: sed Magnetorheological shit d G-band of Graphene Oxide observed at 1576.42 cm" due to the doubly degenerate zone center E2g and 2D band at 2702.58 cm" confirms the presence of Graphene Oxide. UV - VIS Absorption spectrum spectroscopic analysis of conventional Magnetorheological fAluid and Graphene Oxide fluid. Raman spectra have been recorded using 532 nm laser excitation. The down o ased MR fAuid has been recorded of T-t plasmon peak at 233.82 cm' while a broad band is displayed in ventional Magnetorhe mbustion method of separating Graphene layers by controlled oxidation. This analysis shows highly efficient, rheological fluid. Here, Graphene Oxide used in Magnetorheological fluid is prepared by ineauivocal, non-destructive identification of Graphene Oxide in Magnetorheological fluid.


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0


Rapidly quenched magnetic materials for functional and sensor applications

Publication Date : 03/11/2021

Author(s) :

ASHIS K. PANDA, RAJAT K. ROY,, PREMKUMAR MURUGAIYAN, SOMNATH DAS, TARUN K. DAS, AMITAVA MITRA.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

Rapidly quenched (RQ) amorphous / nanostructured materials have been addressed in relation to their properties targeted towards potential applications. Quenching techniques like melt spinning and in-water quenching for production of these materials in the form of ribbons and microwires production respectively have been addressed. CoFe-based microwires exhibited interesting giant magneto-impedance (GMI) behviour and was used in development of GMI sensor for detection of carburization in austenitic stainless steel. Efforts have been laid on the production of Fe-based magnetostrictive amorphous ribbons and their potential use in magnetostrictive sensor (MsS) for generation of guided waves for detection of defects in pipes. Compositional tailoring has also been carried out in amorphous/ nanostructured ribbons to raise the saturation magnetization beyond 1.6 Tesla. Some of these ribbons have also been found to manifest interesting electromagnetic interference shielding effectiveness (EMI SE) properties.


No. of Downloads :

3


Tuning surface resistivity and thermal hased polymer composite via conductivity of water resistant fly ash waste tailoring the interfacial polarization

Publication Date : 03/11/2021

Author(s) :

SANDHYA SINGH TRIPALIYA, MANOJ KUMAR GUPT, RIYA SAHU, ASOKAN PAPPU, CHARU SHARMA, ASHISH KUMAR CHATURVED.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

High performance environment friendly industrial inorganic waste (fly ash) waste based water resistant electrical insulating hybrid composites are fabricated with very high surface and volume resistivity. Dielectric constant of hybrid composite was decreased significantly from 10900 to 4.98, 5.25, 5.00, 5.81, and 6.69 for filler concentrations of 10, 20, 30, 50 and 60% in epoxy matrix, respectively. Very high surface resistivity of 10 Ohms/sq. and volume resistivity of 104 to 10'5 Ohms-cm with ultra-low water absorption of 0.14 % were achieved. Thermal conductivity analysis shows a slight increase in the thermal conductivity of the composite sheet and reaches the value of 0.4387 W/mK. Such high resistivity is attributed due to low dielectric constant and interfacial polarization and low water absorption in the samples. Our approach presents new, adaptable and cost-effective means for effectively utilizing waste as eco-friendly electrical and thermal insulating sheet and lowering the thermal loss in microelectronics.


No. of Downloads :

14


Mg-based biodegradable alloys for orthopedic implants -A review

Publication Date : 03/11/2021

Author(s) :

ANSU J KAILATH', ARVIND SINHA.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

: Traditional metallic biomaterials for orthopedic implants require materials exhibiting excellent corrosion resistance in human body. Recently, implants made of biodegradable metallic materials are thought to be potential for orthopedic implant applications as they can circumvent revision surgeries. These implants are considered as the third generation implants as they are expected to provide adequate mechanical strength to support the bone during restoration; have excellent in vivo biocompatibility and controlled degradation rate. These implants would degrade within the body after completing its mission without leaving any residues within the body. Biocompatible elements like Mg, Fe and Zn and their alloys have been considered for bone implant applications due to their biodegradability. Amongst these, Mg alloys are preferred due its high specific strength, low elastic modulus that are close to human bone and low density minimizing the risk of stress shielding. However, Mg alloys have fast degradation rate in biological fuids leading to the release of hydrogen which would lead to premature failure of implants. This paper reviews the research efforts towards the development of Mg-based biodegradable alloys for orthopedic implants. Concepts followed in designing Mg-based biodegradable alloys, the mechanical properties of developed Mg-based alloys, degradation mechanism of Mg-based alloys and the efforts to reduce the degradation rate, and status of Mg-based alloys in orthopedic applications are compiled along with the existing problems and future research directions.


No. of Downloads :

4


Technology glimpse of bio ceramic implants developed by CSIR-CGCRI, Kolkata

Publication Date : 03/11/2021

Author(s) :

BISWANATH KUNDU, VAMSI K. BALLA, K. MURALEEDHARAN.

Volume/Issue :
Volume : Volume 1
Issue : Issue 3
Month : (11 - 2021)
Abstract :

or the last two decades, Bioceramics Group of CSIR-Central Glass and Ceramic Research Institute (CSIRCGCRI), Kolkata has been engaged in the development of new generation of ceramic materials for different biomedical applications. The group has developed hip joint prosthesis with ceramic heads, hydroxyapatitebased bone fillers and ocular implants which after successful animal trials have been assessed through clinical trials at diferent hospitals (Calcutta Medical Research Institute, Kolkata; Advanced Medical Research Institute, Kolkata, All India Institute of Medical Sciences, New Delhi and Moulana Azad Medical College, New Delhi for hip implants and bone fillers and Eye Care and Research Centre, Kolkata; All India Institute of Medical Sciences, New Delhi, Sir Gangaram Hospital, New Delhi, Moulana Azad Medical College, New Delhi, Shankara Nethralaya, Chennai, Sri Sankardeva Nethralaya, Guwahati, Sarojini Devi Eye Hospital, Hyderabad and Disha Eye Hospital, Barackpore) in the country. These technologies have been commercialized and available in Indian market through M/s IFGL Bioceramics Ltd., Kolkata since January, 2005. Thereafter, few of the technologies have been transferred to other Indian companies who are in the process of obtaining manufacturing license from DCGI before commercialization. The Institute has also developed coatings on metallic implants by plasma spraying hydroxyapatite/other calcium phosphates for cementless fixation in the human subjects. These clinical trailswere primarily carried out at Sancheti Institute of Orthopedic and Rehabilitation, Pune under the leaderships of Padmavibhushan Dr. K.H. Sancheti. Further, the Institute has also actively participated in few CSIR network programmes to develop coated implants using diamond-like nano-composite (DLN) and standardize laser engineered net shaping (LENS) process for development of patient specific prosthesis of irregular shapes.


No. of Downloads :

2