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Article ; Online: Phase prediction and experimental realisation of a new high entropy alloy using machine learning.

Singh, Swati / Katiyar, Nirmal Kumar / Goel, Saurav / Joshi, Shrikrishna N

2023 Volume 13, Issue 1, Page(s) 4811

Abstract: ... Nearly ~ ... ...

Abstract	Nearly ~ 10
Language	English
Publishing date	2023-03-23
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-023-31461-7
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Nanoparticle-mediated cancer cell therapy: basic science to clinical applications.

Verma, Jaya / Warsame, Caaisha / Seenivasagam, Rajkumar Kottayasamy / Katiyar, Nirmal Kumar / Aleem, Eiman / Goel, Saurav

Cancer metastasis reviews

2023 Volume 42, Issue 3, Page(s) 601–627

Abstract: Every sixth person in the world dies due to cancer, making it the second leading severe cause of death after cardiovascular diseases. According to WHO, cancer claimed nearly 10 million deaths in 2020. The most common types of cancers reported have been ... ...

Abstract	Every sixth person in the world dies due to cancer, making it the second leading severe cause of death after cardiovascular diseases. According to WHO, cancer claimed nearly 10 million deaths in 2020. The most common types of cancers reported have been breast (lung, colon and rectum, prostate cases), skin (non-melanoma) and stomach. In addition to surgery, the most widely used traditional types of anti-cancer treatment are radio- and chemotherapy. However, these do not distinguish between normal and malignant cells. Additional treatment methods have evolved over time for early detection and targeted therapy of cancer. However, each method has its limitations and the associated treatment costs are quite high with adverse effects on the quality of life of patients. Use of individual atoms or a cluster of atoms (nanoparticles) can cause a paradigm shift by virtue of providing point of sight sensing and diagnosis of cancer. Nanoparticles (1-100 nm in size) are 1000 times smaller in size than the human cell and endowed with safer relocation capability to attack mechanically and chemically at a precise location which is one avenue that can be used to destroy cancer cells precisely. This review summarises the extant understanding and the work done in this area to pave the way for physicians to accelerate the use of hybrid mode of treatments by leveraging the use of various nanoparticles.
MeSH term(s)	Male ; Humans ; Quality of Life ; Melanoma ; Cardiovascular Diseases ; Nanoparticles
Language	English
Publishing date	2023-02-24
Publishing country	Netherlands
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	604857-2
ISSN	1573-7233 ; 0167-7659
ISSN (online)	1573-7233
ISSN	0167-7659
DOI	10.1007/s10555-023-10086-2
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Article ; Online: A resistance-driven H

Mondal, Bidesh / Zhang, Xiaolei / Kumar, Sumit / Long, Feng / Katiyar, Nirmal Kumar / Kumar, Mahesh / Goel, Saurav / Biswas, Krishanu

Nanoscale

2023 Volume 15, Issue 42, Page(s) 17097–17104

Abstract: The need to use hydrogen ( ... ...

Abstract	The need to use hydrogen (H
Language	English
Publishing date	2023-11-02
Publishing country	England
Document type	Journal Article
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/d3nr04810a
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Article ; Online: Nanofabrication route to achieve sustainable production of next generation defect-free graphene

Misra Shikhar / Katiyar Nirmal Kumar / Kumar Arvind / Goel Saurav / Biswas Krishanu

Nanofabrication, Vol 6, Iss 1, Pp 36-

analysis and characterisation

2021 Volume 43

Abstract: In the past two decades, graphene has been one of the most studied materials due to its exceptional properties. The scalable route to cost-effective manufacture defect-free graphene has continued to remain a technical challenge. Intrinsically defect-free ...

Abstract	In the past two decades, graphene has been one of the most studied materials due to its exceptional properties. The scalable route to cost-effective manufacture defect-free graphene has continued to remain a technical challenge. Intrinsically defect-free graphene changes its properties dramatically, and it is a challenging task to control the defects in graphene production using scaled-down subtractive manufacturing techniques. In this work, the exfoliation of graphite was investigated as a sustainable low-cost graphene manufacturing technique. The study made use of a simple domestic appliance e.g., a kitchen blender to churn graphene in wet conditions by mixing with N-Methyl-2-pyrrolidone (NMP). It was found that the centrifugal force-induced turbulent flow caused by the rotating blades exfoliates graphite flakes to form graphene. The technique is endowed with a high yield of defect-free graphene (0.3 g/h) and was deemed suitable to remove 10% fluoride content from the water and color absorption from fizzy drinks.
Keywords	graphite exfoliation ; graphene ; kitchen blender ; Science ; Q
Subject code	670
Language	English
Publishing date	2021-12-01T00:00:00Z
Publisher	EurAsia Academic Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Stabilization of a Highly Concentrated Colloidal Suspension of Pristine Metallic Nanoparticles

Katiyar, Nirmal Kumar / Chandra Sekhar Tiwary / Krishanu Biswas / Leonardo Dantas Machado / Raju Kumar Gupta

Langmuir. 2019 Jan. 24, v. 35, no. 7

2019

Abstract: A colloidal suspension containing a high concentration of metallic nanoparticles (NPs) finds potential applications in flexible electronic printing, nanofluids, healthcare, antifouling coating, and so on. Here, we demonstrate a generic, easily scalable, ... ...

Abstract	A colloidal suspension containing a high concentration of metallic nanoparticles (NPs) finds potential applications in flexible electronic printing, nanofluids, healthcare, antifouling coating, and so on. Here, we demonstrate a generic, easily scalable, simple, and contamination-free cryogenic temperature grinding method, which can effectively be used to prepare pristine NPs that can be stabilized in polar liquids in high concentrations. These surfactant-free pristine NPs have been found to remain dispersed in different polar liquids (CH3OH, C2H5OH, glycol, etc.) for weeks. The long-term stability of the NPs in these liquids has been investigated using zeta potential, in situ Fourier transform infrared spectroscopy, indicating electrostatic stabilization for ultrapure, surfactant-free NPs. Furthermore, stabilization of the NPs has been probed with detailed calculations using the Derjaguin Landau Verwey Overbeek theory as well as atomistic molecular dynamics simulation (MD). Experimental measurements along with theoretical calculations categorically indicate that the electrostatic energy is helping these NPs to be stabilized in a polar liquid.
Keywords	antifouling agents ; coatings ; colloids ; energy ; ethanol ; Fourier transform infrared spectroscopy ; grinding ; health services ; liquids ; methanol ; molecular dynamics ; nanofluids ; nanoparticles ; temperature ; zeta potential
Language	English
Dates of publication	2019-0124
Size	p. 2668-2673.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021/acs.langmuir.8b03401
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Article ; Online: Stabilization of a Highly Concentrated Colloidal Suspension of Pristine Metallic Nanoparticles.

Katiyar, Nirmal Kumar / Biswas, Krishanu / Tiwary, Chandra Sekhar / Machado, Leonardo Dantas / Gupta, Raju Kumar

Langmuir : the ACS journal of surfaces and colloids

2019 Volume 35, Issue 7, Page(s) 2668–2673

Abstract	A colloidal suspension containing a high concentration of metallic nanoparticles (NPs) finds potential applications in flexible electronic printing, nanofluids, healthcare, antifouling coating, and so on. Here, we demonstrate a generic, easily scalable, simple, and contamination-free cryogenic temperature grinding method, which can effectively be used to prepare pristine NPs that can be stabilized in polar liquids in high concentrations. These surfactant-free pristine NPs have been found to remain dispersed in different polar liquids (CH
Language	English
Publishing date	2019-02-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021/acs.langmuir.8b03401
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Article ; Online: Multi-component (Ag-Au-Cu-Pd-Pt) alloy nanoparticle-decorated p-type 2D-molybdenum disulfide (MoS

Urs, Kusuma M B / Katiyar, Nirmal Kumar / Kumar, Ritesh / Biswas, Krishanu / Singh, Abhishek K / Tiwary, C S / Kamble, Vinayak

Nanoscale

2020 Volume 12, Issue 22, Page(s) 11830–11841

Abstract: Molybdenum disulfide (MoS2) has emerged as a promising material for the development of efficient sensors. Here, we have exfoliated and decorated MoS2 flakes with the novel, single-phase multi-component silver-gold-copper-palladium-platinum (Ag-Au-Cu-Pd- ... ...

Abstract	Molybdenum disulfide (MoS2) has emerged as a promising material for the development of efficient sensors. Here, we have exfoliated and decorated MoS2 flakes with the novel, single-phase multi-component silver-gold-copper-palladium-platinum (Ag-Au-Cu-Pd-Pt) alloy nanoparticles, popularly named High Entropy Alloy (HEA) nanoparticles, using facile and scalable low-temperature grinding, followed by the sonochemical method. It was found that the decoration of HEA nanoparticles imparts the surface-enhanced Raman scattering effect and reduction in the work function of the material from 4.9 to 4.75 eV as measured by UV photoelectron spectroscopy. This change in the work function resulted in a Schottky barrier between the gold contact and HEA decorated MoS2 flakes as a result of drastic changes in the surface chemical non-stoichiometry. The response to hydrogen gas was studied at temperatures in the range of 30 to 100 °C, and it showed an unusual p-type nature due to surface-adsorbed oxygen species. The nanoscale junction formed between HEA and MoS2 showed a ten-time increase in the response towards hydrogen gas at 80 °C. The experimental observations have been explained with DFT simulation showing more favourable hydrogen adsorption on HEA-decorated MoS2 resulting in an enhanced response.
Language	English
Publishing date	2020-05-27
Publishing country	England
Document type	Journal Article
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/d0nr02177f
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Article: Low-Temperature CO Oxidation over Combustion Made Fe- and Cr-Doped Co3O4 Catalysts: Role of Dopant’s Nature toward Achieving Superior Catalytic Activity and Stability

Baidya, Tinku / Bera Parthasarathi / Biswas Krishanu / Haruta Masatake / Katiyar Nirmal Kumar / Murayama Toru / Safonova Olga V / Steiger Patrick

The Journal of Physical Chemistry C. 2017 July 20, v. 121, no. 28

2017

Abstract: Co3O4 with a spinel structure shows unique activity for CO oxidation at low temperature under dry conditions; however the active surface is not very stable. In this study, two series of Fe- and Cr-doped Co3O4 catalysts were prepared by a single-step ... ...

Abstract	Co3O4 with a spinel structure shows unique activity for CO oxidation at low temperature under dry conditions; however the active surface is not very stable. In this study, two series of Fe- and Cr-doped Co3O4 catalysts were prepared by a single-step solution combustion technique. Fe was chosen because of its redox activity corresponding to the Fe2+/Fe3+ redox couple and compared to Cr, which is mainly stable in the Cr3+ state. The catalytic activity of new materials for low-temperature CO oxidation was correlated to the nature of the dopant. As a function of dopant concentration, the temperature corresponding to the 50% CO conversion (T50) demonstrated significant differences. The maximal activity was achieved for 15% Fe-doped Co3O4 with T50 of −85 °C and remained almost constant up to 25% Fe. In the case of Cr, the activity was observed to be maximum for 7% of Cr with T50 of −42 °C and significantly decreased for higher Cr loadings. Similarly, there was a contrasting behavior in catalyst stability too. 100% CO conversion was achieved below −60 °C for 15% Fe/Co3O4 catalyst and remained unchanged even after calcination at 600 °C. In contrast, Co3O4 or 15% Cr/Co3O4 catalysts strongly deactivated after the same treatment. These differences were correlated to the oxidation states, coordination numbers, the nature of surface planes, and the redox properties. We observed that both Cr and Fe were typically present in the +3 oxidation state, occupying octahedral sites in the spinel structure. The catalysts were mainly exposed to (111) and (220) planes on the surface. H2-TPR indicated clear differences in the redox activity of materials due to Fe and Cr substitutions. The reducibility of surface Co3+ species remained similar in all Fe-doped Co3O4 catalysts in contrast to nonreducible Cr-doped analogs, which shifted the reduction temperature to the higher values. As the Fe3+/Fe2+ redox couple partly substituted the Co3+/Co2+ redox couple in the spinel structure, similar bond strength of Fe–O keep redox activity of Co3+ species almost unchanged leading to higher activity and stability of Fe/Co3O4 catalysts for low-temperature CO oxidation. In contrast, nonreducible Cr3+ species characterized by strong Cr–O bond substituting active Co3+ sites can make the Cr/Co3O4 surface less active for CO oxidation.
Keywords	carbon monoxide ; catalysts ; catalytic activity ; chemical bonding ; chromium ; cobalt oxide ; combustion ; iron ; temperature
Language	English
Dates of publication	2017-0720
Size	p. 15256-15265.
Publishing place	American Chemical Society
Document type	Article
ISSN	1932-7455
DOI	10.1021%2Facs.jpcc.7b04348
Database	NAL-Catalogue (AGRICOLA)

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Book ; Online: High Entropy Alloy Nanoparticles Decorated, p-type 2D-Molybdenum Disulphide (MoS2) and Gold Schottky Junction Enhanced Hydrogen Sensing

MB, Kusuma Urs / Katiyar, Nirmal Kumar / Kumar, Ritesh / Biswas, Krishanu / Singh, Abhishek K. / Tiwary, C S / Kamble, Vinayak

2020

Abstract: Molybdenum Disulphide (MoS2) is an interesting material which exists in atomically thin multilayers and can be exfoliated into monolayer or a few layers for multiple applications. It has emerged as a promising material for development of such efficient ... ...

Abstract	Molybdenum Disulphide (MoS2) is an interesting material which exists in atomically thin multilayers and can be exfoliated into monolayer or a few layers for multiple applications. It has emerged as a promising material for development of such efficient sensors. Here, we have exfoliated and decorated MoS2 flakes with novel, single phase High Entropy Alloy (HEA) nanoparticles using facile and scalable cryomilling technique, followed by sonochemical method. It is found that the decoration of HEA nanoparticles impart surface enhanced Raman scattering effect and reduction in the work function of the material from 4.9 to 4.75 eV as measured by UV photoelectron spectroscopy. This change in the work function results in a schottky barrier between the gold contact and HEA decorated MoS2 flakes as a result of drastic changes in the surface chemical non-stoichiometry. The response to hydrogen gas is studied at temperatures 30 to 100 oC and it shows unusual p-type nature due to surface adsorbed oxygen species. The nanoscale junction formed between HEA and MoS2 shows 10 times increase in the response towards hydrogen gas at 80 oC. The experimental observations are further explained with DFT simulation showing more favourable hydrogen adsorption on HEA decorated MoS2 resulting for enhanced response.
Keywords	Condensed Matter - Materials Science ; Condensed Matter - Mesoscale and Nanoscale Physics
Publishing date	2020-02-06
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Hollow Gold Nanoprism as Highly Efficient “Single” Nanotransducer for Surface-Enhanced Raman Scattering Applications

Hazra, Bidhan / Das Kamalika / Das Chakraborty Sudeshna / Verma Mrigank Singh / Devi Mayanlambam Manolata / Katiyar NirmalKumar / Biswas Krishanu / Senapati Dulal / Chandra Manabendra

The Journal of Physical Chemistry C. 2016 Nov. 10, v. 120, no. 44

2016

Abstract: In this Article, we report the optical properties of anisotropic hollow nanostructure, hollow gold nanoprism (HGN, an equilateral triangular gold nanoprism with a circular cavity) and its application as a highly active “nonaggregated” surface-enhanced ... ...

Abstract	In this Article, we report the optical properties of anisotropic hollow nanostructure, hollow gold nanoprism (HGN, an equilateral triangular gold nanoprism with a circular cavity) and its application as a highly active “nonaggregated” surface-enhanced Raman scattering (SERS) substrate. Small colloidal HGNs are prepared using sacrificial galvanic replacement method. Our study reveals that HGNs are highly stable nanostructure in solution and robust against salt or ligand induced aggregation. We find that the LSPR spectra of the HGNs can be tuned by controlling their aspect ratios. Excellent SERS were detected from the J-aggregates of pseudoisocyanine dye, adsorbed on the HGN surface. Interestingly, strong SERS is obtained without the need of any aggregation of the nanoparticles. Numerical simulations reveal that a single HGN can not only harvest large local electromagnetic fields but also offer large sensing volume due to efficient plasmon hybridization, due to the presence of the cavity. This large sensing volume is a great advantage, and it is the key factor behind the observation of SERS from nonaggregated HGNs. A careful optimization of the plasmon-hybridization mediated field enhancement, for example, by controlling the cavity positions through the use of lithographic techniques, can enhance the SERS signal even further. All of the observations and analyses made in this work clearly suggest that HGNs will be an excellent choice in SERS-based chemical and biological sensing applications. Moreover, the cavity of an HGN has the potential for being used as nanoreactor, in the future.
Keywords	Raman spectroscopy ; electromagnetic field ; gold ; ligands ; mathematical models ; nanoparticles ; nanoprisms ; optical properties ; physical chemistry
Language	English
Dates of publication	2016-1110
Size	p. 25548-25556.
Publishing place	American Chemical Society
Document type	Article
ISSN	1932-7455
DOI	10.1021%2Facs.jpcc.6b09467
Database	NAL-Catalogue (AGRICOLA)

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