Gaurav Bhaduri - Academia.edu (original) (raw)

Papers by Gaurav Bhaduri

Research paper thumbnail of Biomimetic Catalysis of CO<sub>2</sub> Hydration: A Materials Perspective

Industrial & Engineering Chemistry Research, Mar 18, 2021

Rising temperatures and changing weather patterns have made the effect of climate change more evi... more Rising temperatures and changing weather patterns have made the effect of climate change more evident setting up an alarm for the need of quick action for its mitigation. Carbon capture utilization...

Research paper thumbnail of Microstructural Characterization and Tribological Properties of Atmospheric Plasma Sprayed High Entropy Alloy Coatings

Journal of Thermal Spray Technology, May 31, 2022

NiMoAl coating was deposited by high velocity oxy-fuel spraying from gas-atomized powders and its... more NiMoAl coating was deposited by high velocity oxy-fuel spraying from gas-atomized powders and its tribological properties from 20 to 800°C under unlubricated conditions were evaluated. Scanning electron microscopy, x-ray diffraction, and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The friction coefficient of NiMoAl coating that decreased gradually with the increase of temperature exhibited the highest value of 0.8 at 20°C and the lowest value of 0.29 at 800°C. Meanwhile, NiMoAl coating also possessed an excellent anti-wear property and the wear rate of the coating maintained at a relatively low value at all test temperatures. Characterizations of worn surfaces revealed that the coating suffered abrasive wear at the low temperature. When the temperature elevated to 600 and 800°C, molybdenum oxide and nickel molybdate that were formed through tribo-chemistry reactions acted as lubricants at the high temperature. In addition, NiMoAl coating experienced no obvious oxidation or phase transition on the unrubbed surface during the friction test at 800°C, indicating that the coating performed both thermal stability and lubrication function at the high temperature.

Research paper thumbnail of Green synthesis of silver nanoparticles using sunlight

Journal of Photochemistry and Photobiology A-chemistry, Apr 1, 2013

ABSTRACT Silver nanoparticles (AgNPs) are currently among the most widely used man-made nanomater... more ABSTRACT Silver nanoparticles (AgNPs) are currently among the most widely used man-made nanomaterials, present in a huge range of consumer products. Here we report a simple ‘green’ method of AgNP synthesis of using an anionic surfactant without use of any additional reducing agents. It was observed that synthesis of AgNPs at room temperature (25–35 °C) using sodium dodecyl sulphate (SDS) and sunlight. The nanoparticles have been characterised using high-resolution transmission electron spectroscopy (HRTEM), UV–vis spectrophotometry, X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) and are found to have an average diameter of 30 nm. The nanoparticles are water soluble and the nature of the process is amenable to scaling up.

Research paper thumbnail of Intensification of aqueous mineralisation of CO2 with CaO containing industrial wastes in a modified airlift reactor

Chemical Engineering Research and Design

Research paper thumbnail of Effect of Laser Surface Processing on the Microstructure Evolution and Multiscale Properties of Atmospheric Plasma Sprayed High-Entropy Alloys Coating

Journal of Thermal Spray Technology, Nov 15, 2022

Research paper thumbnail of Effect of Annealing on Microstructural and Tribological Properties of CoCrFeNiW0.3 + 5 at.% C High Entropy Alloy

Journal of Materials Engineering and Performance

Research paper thumbnail of Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi 2 O 3 and β‐Bi 2 O 3 synthesised using microwave combustion

Research paper thumbnail of Influence of Annealing on Microstructure and Tribological Properties of AlCoCrFeNiTi High Entropy Alloy Based Coating

Metals and Materials International

Research paper thumbnail of Catalytic enhancement of hydration of CO₂ using nickel nanoparticles for carbon capture and storage

Research paper thumbnail of Biomimetic Catalysis of CO2 Hydration: A Materials Perspective

Industrial & Engineering Chemistry Research, 2021

Rising temperatures and changing weather patterns have made the effect of climate change more evi... more Rising temperatures and changing weather patterns have made the effect of climate change more evident setting up an alarm for the need of quick action for its mitigation. Carbon capture utilization...

Research paper thumbnail of Comment on “Questioning the catalytic effect of Ni nanoparticles on CO2 hydration and the very need of such catalysis for CO2 mineralization from aqueous solutions by Ramsden et al. Chem. Eng. Sci. (2018) 175–162”

Chemical Engineering Science, 2019

Research paper thumbnail of Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Bulletin of Chemical Reaction Engineering & Catalysis, 2017

Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental co... more Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental contaminants. In this research Bi2O3 has been synthesized by precipitation method using two different bases (NH4OH and NaOH). The samples thus obtained were then analyzed using FTIR, XRD, and SEM for surface functionalization, crystal structures and morphological differences, respectively. The Bi2O3 precipitated using NH4OH showed a flower like structure made up of individual plates having α-Bi2O3 crystal structure. The precipitate obtained using NaOH showed a honeycomb like flower structure with a mixture of both α-Bi2O3 and γ-Bi2O3 crystal structure. Degradation of methyl orange (MO) was used as a model system to test the photocatalytic activity of the bismuth oxide. The Bi2O3 synthesized using NH4OH showed superior photocatalytic degradation of methyl orange than the one synthesized using NaOH. Copyright © 2017 BCREC Group. All rights reservedReceived: 12nd April 2017; Revised: 24th Jun...

Research paper thumbnail of Catalytic Performance of Nickel Nanowires Immobilized in Silica Aerogels for the CO2 Hydration Reaction

Research paper thumbnail of Enrichment of Nanodiamond Surfaces with Carboxyl Groups for Doxorubicin Loading and Release

IOP Conference Series: Materials Science and Engineering, 2017

In their pristine state, nanodiamond crystals produced via detonation techniques containing sever... more In their pristine state, nanodiamond crystals produced via detonation techniques containing several functional groups present on the surface including amine, amide, alcohol, carbonyl, and carboxyl. These functional groups facilitate nanodiamond to interact drugs so as to nanodiamond is potential for medical application such as drug delivery. Even though research on t he use of nanodiamond for this application has been conducted widely, research on the effect of enrichment of nanodiamond surface with carboxyl functional groups for drug loading and release has not been explored extensively. Therefore, in this paper, the effect of carboxyl-terminated nanodiamond (ND-COOH) on drug loading and release will be presented. The enrichment of nanodiamond with carboxyl groups was undertaken by treating nanodiamond with sulphuric acid and nitric acid. The results show that the doxorubicin (DOX) loading and release efficiencies of ND pristine are higher than that of ND-COOH.

Research paper thumbnail of Cover Picture: Photochemical Enhancement in Catalytic Activity of Nickel Nanoparticles for Hydration of CO2

Research paper thumbnail of Synthesis of α-Bismuth oxide using solution combustion method and its photocatalytic properties

IOP Conference Series: Materials Science and Engineering, 2016

The monoclinic bismuth oxide was prepared by the solution combustion method using bismuthyl nitra... more The monoclinic bismuth oxide was prepared by the solution combustion method using bismuthyl nitrate as the raw material and citric acid as fuel. The synthesis process consisted of the formation of a clear transparent solution and the formation of white powder after heating the mixture at 250 C for 2 hours. The yellow pale crystalline materials were obtained after calcination of the white powder at 600 C for 80 minutes. Furthermore, the photocatalytic activity of the product was also studied using methyl orange as a model pollutant. The result showed that the coral reef-like bismuth oxide was able to degrade 50 mL methyl orange (5 ppm) by 37.8 % within 12 hours irradiation using 75-watt tungsten lamp.

Research paper thumbnail of Synthesis and characterisation of ambient pressure dried composites of silica aerogel matrix and embedded nickel nanoparticles

The Journal of Supercritical Fluids, 2015

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Intern... more This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence Newcastle University ePrints-eprint.ncl.ac.uk Han X, Williamson F, Bhaduri GA, Harvey A, Siller L. Synthesis and characterisation of ambient pressure dried composites of silica aerogel matrix and embedded nickel nanoparticles.

Research paper thumbnail of Reply to the ‘Comment on “Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage”’ by D. Britt, Catal. Sci. Technol., 2013, 3, DOI: 10.1039/C3CY00142C

Catalysis Science & Technology, 2013

Reply to the 'Comment on ''Nickel nanoparticles catalyse reversible hydration of carbon dioxide f... more Reply to the 'Comment on ''Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage''' by D.

Research paper thumbnail of Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage

Catalysis Science & Technology, 2013

The separation and storage of CO2 in geological form as mineral carbonates has been seen as a via... more The separation and storage of CO2 in geological form as mineral carbonates has been seen as a viable method to reduce the concentration of CO2 from the atmosphere. Mineralization of CO2 to mineral salts like calcium carbonate provides a stable storage of CO2. Reversible hydration of CO2 to carbonic acid is the rate limiting step in the mineralization process. We report catalysis of the reversible hydration of CO2 using nickel nanoparticles (NiNPs) at room temperature and atmospheric pressure. The catalytic activity of the NiNPs is pH independent and as they are water insoluble and magnetic they can be magnetically separated for reuse. The reaction steps were characterized using X-ray photoemission spectroscopy and a possible reaction mechanism is described.

Research paper thumbnail of Photochemical Enhancement in Catalytic Activity of Nickel Nanoparticles for Hydration of CO2

ChemistrySelect, 2016

This work is licensed under a Creative Commons Attribution 4.0 International License Newcastle Un... more This work is licensed under a Creative Commons Attribution 4.0 International License Newcastle University ePrints-eprint.ncl.ac.uk

Research paper thumbnail of Biomimetic Catalysis of CO<sub>2</sub> Hydration: A Materials Perspective

Industrial & Engineering Chemistry Research, Mar 18, 2021

Rising temperatures and changing weather patterns have made the effect of climate change more evi... more Rising temperatures and changing weather patterns have made the effect of climate change more evident setting up an alarm for the need of quick action for its mitigation. Carbon capture utilization...

Research paper thumbnail of Microstructural Characterization and Tribological Properties of Atmospheric Plasma Sprayed High Entropy Alloy Coatings

Journal of Thermal Spray Technology, May 31, 2022

NiMoAl coating was deposited by high velocity oxy-fuel spraying from gas-atomized powders and its... more NiMoAl coating was deposited by high velocity oxy-fuel spraying from gas-atomized powders and its tribological properties from 20 to 800°C under unlubricated conditions were evaluated. Scanning electron microscopy, x-ray diffraction, and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The friction coefficient of NiMoAl coating that decreased gradually with the increase of temperature exhibited the highest value of 0.8 at 20°C and the lowest value of 0.29 at 800°C. Meanwhile, NiMoAl coating also possessed an excellent anti-wear property and the wear rate of the coating maintained at a relatively low value at all test temperatures. Characterizations of worn surfaces revealed that the coating suffered abrasive wear at the low temperature. When the temperature elevated to 600 and 800°C, molybdenum oxide and nickel molybdate that were formed through tribo-chemistry reactions acted as lubricants at the high temperature. In addition, NiMoAl coating experienced no obvious oxidation or phase transition on the unrubbed surface during the friction test at 800°C, indicating that the coating performed both thermal stability and lubrication function at the high temperature.

Research paper thumbnail of Green synthesis of silver nanoparticles using sunlight

Journal of Photochemistry and Photobiology A-chemistry, Apr 1, 2013

ABSTRACT Silver nanoparticles (AgNPs) are currently among the most widely used man-made nanomater... more ABSTRACT Silver nanoparticles (AgNPs) are currently among the most widely used man-made nanomaterials, present in a huge range of consumer products. Here we report a simple ‘green’ method of AgNP synthesis of using an anionic surfactant without use of any additional reducing agents. It was observed that synthesis of AgNPs at room temperature (25–35 °C) using sodium dodecyl sulphate (SDS) and sunlight. The nanoparticles have been characterised using high-resolution transmission electron spectroscopy (HRTEM), UV–vis spectrophotometry, X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) and are found to have an average diameter of 30 nm. The nanoparticles are water soluble and the nature of the process is amenable to scaling up.

Research paper thumbnail of Intensification of aqueous mineralisation of CO2 with CaO containing industrial wastes in a modified airlift reactor

Chemical Engineering Research and Design

Research paper thumbnail of Effect of Laser Surface Processing on the Microstructure Evolution and Multiscale Properties of Atmospheric Plasma Sprayed High-Entropy Alloys Coating

Journal of Thermal Spray Technology, Nov 15, 2022

Research paper thumbnail of Effect of Annealing on Microstructural and Tribological Properties of CoCrFeNiW0.3 + 5 at.% C High Entropy Alloy

Journal of Materials Engineering and Performance

Research paper thumbnail of Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi 2 O 3 and β‐Bi 2 O 3 synthesised using microwave combustion

Research paper thumbnail of Influence of Annealing on Microstructure and Tribological Properties of AlCoCrFeNiTi High Entropy Alloy Based Coating

Metals and Materials International

Research paper thumbnail of Catalytic enhancement of hydration of CO₂ using nickel nanoparticles for carbon capture and storage

Research paper thumbnail of Biomimetic Catalysis of CO2 Hydration: A Materials Perspective

Industrial & Engineering Chemistry Research, 2021

Rising temperatures and changing weather patterns have made the effect of climate change more evi... more Rising temperatures and changing weather patterns have made the effect of climate change more evident setting up an alarm for the need of quick action for its mitigation. Carbon capture utilization...

Research paper thumbnail of Comment on “Questioning the catalytic effect of Ni nanoparticles on CO2 hydration and the very need of such catalysis for CO2 mineralization from aqueous solutions by Ramsden et al. Chem. Eng. Sci. (2018) 175–162”

Chemical Engineering Science, 2019

Research paper thumbnail of Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

Bulletin of Chemical Reaction Engineering & Catalysis, 2017

Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental co... more Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental contaminants. In this research Bi2O3 has been synthesized by precipitation method using two different bases (NH4OH and NaOH). The samples thus obtained were then analyzed using FTIR, XRD, and SEM for surface functionalization, crystal structures and morphological differences, respectively. The Bi2O3 precipitated using NH4OH showed a flower like structure made up of individual plates having α-Bi2O3 crystal structure. The precipitate obtained using NaOH showed a honeycomb like flower structure with a mixture of both α-Bi2O3 and γ-Bi2O3 crystal structure. Degradation of methyl orange (MO) was used as a model system to test the photocatalytic activity of the bismuth oxide. The Bi2O3 synthesized using NH4OH showed superior photocatalytic degradation of methyl orange than the one synthesized using NaOH. Copyright © 2017 BCREC Group. All rights reservedReceived: 12nd April 2017; Revised: 24th Jun...

Research paper thumbnail of Catalytic Performance of Nickel Nanowires Immobilized in Silica Aerogels for the CO2 Hydration Reaction

Research paper thumbnail of Enrichment of Nanodiamond Surfaces with Carboxyl Groups for Doxorubicin Loading and Release

IOP Conference Series: Materials Science and Engineering, 2017

In their pristine state, nanodiamond crystals produced via detonation techniques containing sever... more In their pristine state, nanodiamond crystals produced via detonation techniques containing several functional groups present on the surface including amine, amide, alcohol, carbonyl, and carboxyl. These functional groups facilitate nanodiamond to interact drugs so as to nanodiamond is potential for medical application such as drug delivery. Even though research on t he use of nanodiamond for this application has been conducted widely, research on the effect of enrichment of nanodiamond surface with carboxyl functional groups for drug loading and release has not been explored extensively. Therefore, in this paper, the effect of carboxyl-terminated nanodiamond (ND-COOH) on drug loading and release will be presented. The enrichment of nanodiamond with carboxyl groups was undertaken by treating nanodiamond with sulphuric acid and nitric acid. The results show that the doxorubicin (DOX) loading and release efficiencies of ND pristine are higher than that of ND-COOH.

Research paper thumbnail of Cover Picture: Photochemical Enhancement in Catalytic Activity of Nickel Nanoparticles for Hydration of CO2

Research paper thumbnail of Synthesis of α-Bismuth oxide using solution combustion method and its photocatalytic properties

IOP Conference Series: Materials Science and Engineering, 2016

The monoclinic bismuth oxide was prepared by the solution combustion method using bismuthyl nitra... more The monoclinic bismuth oxide was prepared by the solution combustion method using bismuthyl nitrate as the raw material and citric acid as fuel. The synthesis process consisted of the formation of a clear transparent solution and the formation of white powder after heating the mixture at 250 C for 2 hours. The yellow pale crystalline materials were obtained after calcination of the white powder at 600 C for 80 minutes. Furthermore, the photocatalytic activity of the product was also studied using methyl orange as a model pollutant. The result showed that the coral reef-like bismuth oxide was able to degrade 50 mL methyl orange (5 ppm) by 37.8 % within 12 hours irradiation using 75-watt tungsten lamp.

Research paper thumbnail of Synthesis and characterisation of ambient pressure dried composites of silica aerogel matrix and embedded nickel nanoparticles

The Journal of Supercritical Fluids, 2015

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Intern... more This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence Newcastle University ePrints-eprint.ncl.ac.uk Han X, Williamson F, Bhaduri GA, Harvey A, Siller L. Synthesis and characterisation of ambient pressure dried composites of silica aerogel matrix and embedded nickel nanoparticles.

Research paper thumbnail of Reply to the ‘Comment on “Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage”’ by D. Britt, Catal. Sci. Technol., 2013, 3, DOI: 10.1039/C3CY00142C

Catalysis Science & Technology, 2013

Reply to the 'Comment on ''Nickel nanoparticles catalyse reversible hydration of carbon dioxide f... more Reply to the 'Comment on ''Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage''' by D.

Research paper thumbnail of Nickel nanoparticles catalyse reversible hydration of carbon dioxide for mineralization carbon capture and storage

Catalysis Science & Technology, 2013

The separation and storage of CO2 in geological form as mineral carbonates has been seen as a via... more The separation and storage of CO2 in geological form as mineral carbonates has been seen as a viable method to reduce the concentration of CO2 from the atmosphere. Mineralization of CO2 to mineral salts like calcium carbonate provides a stable storage of CO2. Reversible hydration of CO2 to carbonic acid is the rate limiting step in the mineralization process. We report catalysis of the reversible hydration of CO2 using nickel nanoparticles (NiNPs) at room temperature and atmospheric pressure. The catalytic activity of the NiNPs is pH independent and as they are water insoluble and magnetic they can be magnetically separated for reuse. The reaction steps were characterized using X-ray photoemission spectroscopy and a possible reaction mechanism is described.

Research paper thumbnail of Photochemical Enhancement in Catalytic Activity of Nickel Nanoparticles for Hydration of CO2

ChemistrySelect, 2016

This work is licensed under a Creative Commons Attribution 4.0 International License Newcastle Un... more This work is licensed under a Creative Commons Attribution 4.0 International License Newcastle University ePrints-eprint.ncl.ac.uk