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Mandal I, Gangareddy J, Sethurajaperumal A, Nk M, Majji M, Bera S, Rudra P, Ravichandran V, Bysakh S, Jacob N, Rao KDM, Singh RK, Krishnan NMA, Chirumamilla M, Palanisamy T, Motapothula M, Varrla E, Ghosh S, Allu AR. H-Glass Supported Hybrid Gold Nano-Islands for Visible-Light-Driven Hydrogen Evolution. Small 2024:e2401131. [PMID: 38563587 DOI: 10.1002/smll.202401131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/16/2024] [Indexed: 04/04/2024]
Abstract
Flat panel reactors, coated with photocatalytic materials, offer a sustainable approach for the commercial production of hydrogen (H2) with zero carbon footprint. Despite this, achieving high solar-to-hydrogen (STH) conversion efficiency with these reactors is still a significant challenge due to the low utilization efficiency of solar light and rapid charge recombination. Herein, hybrid gold nano-islands (HGNIs) are developed on transparent glass support to improve the STH efficiency. Plasmonic HGNIs are grown on an in-house developed active glass sheet composed of sodium aluminum phosphosilicate oxide glass (H-glass) using the thermal dewetting method at 550 °C under an ambient atmosphere. HGNIs with various oxidation states (Au0, Au+, and Au-) and multiple interfaces are obtained due to the diffusion of the elements from the glass structure, which also facilitates the lifetime of the hot electron to be ≈2.94 ps. H-glass-supported HGNIs demonstrate significant STH conversion efficiency of 0.6%, without any sacrificial agents, via water dissociation. This study unveils the specific role of H-glass-supported HGNIs in facilitating light-driven chemical conversions, offering new avenues for the development of high-performance photocatalysts in various chemical conversion reactions for large-scale commercial applications.
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Affiliation(s)
- Indrajeet Mandal
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
| | - Jagannath Gangareddy
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
| | - Abimannan Sethurajaperumal
- Sustainable Nanomaterials and Technologies Lab, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu, 603203, India
| | - Murugasenapathi Nk
- Electrodics and Electrocatalysis Division (EEC), CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Manikanta Majji
- Department of Physics, SRM University AP, Amaravati, Andhra Pradesh, 522502, India
| | - Susmita Bera
- Research Institute for Sustainable Energy (RISE), TCG Centres for Research and Education in Science and Technology (TCG CREST), Sector V, Salt Lake, Kolkata, 700091, India
| | - Pratyasha Rudra
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Vanmathi Ravichandran
- Sustainable Nanomaterials and Technologies Lab, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu, 603203, India
| | - Sandip Bysakh
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
| | - Noah Jacob
- Department of Physics, SRM University AP, Amaravati, Andhra Pradesh, 522502, India
| | - K D M Rao
- School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Rajiv K Singh
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Photovoltaic Metrology Section, Advanced Material and Devices Metrology Division, CSIR-National Physical Laboratory, New Delhi, 110012, India
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Manohar Chirumamilla
- Department of Materials and Production, Aalborg University, Skjernvej 4A, Aalborg, 9220, Denmark
- Institute of Optical and Electronic Materials, Hamburg University of Technology, Eissendorfer Strasse 38, 21073, Hamburg, Germany
| | - Tamilarasan Palanisamy
- Electrodics and Electrocatalysis Division (EEC), CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - M Motapothula
- Department of Physics, SRM University AP, Amaravati, Andhra Pradesh, 522502, India
| | - Eswaraiah Varrla
- Sustainable Nanomaterials and Technologies Lab, Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu, 603203, India
| | - Srabanti Ghosh
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Amarnath R Allu
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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Gangareddy J, Rudra P, Chirumamilla M, Ganisetti S, Kasimuthumaniyan S, Sahoo S, Jayanthi K, Rathod J, Soma VR, Das S, Gosvami NN, Krishnan NMA, Pedersen K, Mondal S, Ghosh S, Allu AR. Multi-Functional Applications of H-Glass Embedded with Stable Plasmonic Gold Nanoislands. Small 2024; 20:e2303688. [PMID: 37670541 DOI: 10.1002/smll.202303688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 08/11/2023] [Indexed: 09/07/2023]
Abstract
Metal nanoparticles (MNPs) are synthesized using various techniques on diverse substrates that significantly impact their properties. However, among the substrate materials investigated, the major challenge is the stability of MNPs due to their poor adhesion to the substrate. Herein, it is demonstrated how a newly developed H-glass can concurrently stabilize plasmonic gold nanoislands (GNIs) and offer multifunctional applications. The GNIs on the H-glass are synthesized using a simple yet, robust thermal dewetting process. The H-glass embedded with GNIs demonstrates versatility in its applications, such as i) acting as a room temperature chemiresistive gas sensor (70% response for NO2 gas); ii) serving as substrates for surface-enhanced Raman spectroscopy for the identifications of Nile blue (dye) and picric acid (explosive) analytes down to nanomolar concentrations with enhancement factors of 4.8 × 106 and 6.1 × 105 , respectively; and iii) functioning as a nonlinear optical saturable absorber with a saturation intensity of 18.36 × 1015 W m-2 at 600 nm, and the performance characteristics are on par with those of materials reported in the existing literature. This work establishes a facile strategy to develop advanced materials by depositing metal nanoislands on glass for various functional applications.
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Affiliation(s)
- Jagannath Gangareddy
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
| | - Pratyasha Rudra
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Manohar Chirumamilla
- Department of Materials and Production, Aalborg University, Skjernvej 4A, Aalborg, 9220, Denmark
- Institute of Optical and Electronic Materials, Hamburg University of Technology, Eissendorfer Strasse 38, 21073, Hamburg, Germany
| | - Sudheer Ganisetti
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Subramanian Kasimuthumaniyan
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Sourav Sahoo
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - K Jayanthi
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Jagannath Rathod
- Advanced Centre of Research in High Energy Materials (ACRHEM), DRDO Industry Academia-Centre of Excellence (DIA-COE), University of Hyderabad, Hyderabad, Telangana, 500046, India
| | - Venugopal Rao Soma
- Advanced Centre of Research in High Energy Materials (ACRHEM), DRDO Industry Academia-Centre of Excellence (DIA-COE), University of Hyderabad, Hyderabad, Telangana, 500046, India
| | - Subrata Das
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala, 695019, India
| | - Nitya Nand Gosvami
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, 110016, India
| | - Kjeld Pedersen
- Department of Materials and Production, Aalborg University, Skjernvej 4A, Aalborg, 9220, Denmark
| | - Swastik Mondal
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Srabanti Ghosh
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Amarnath R Allu
- CSIR-Central Glass and Ceramic Research Institute, 196 Raja S C Mullick Road, Kolkata, 700 032, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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Sahoo S, Khan Z, Mannan S, Tiwari U, Ye Z, Krishnan NMA, Gosvami NN. Superlubricity and Stress-Shielding of Graphene Enables Ultra Scratch-Resistant Glasses. ACS Appl Mater Interfaces 2023. [PMID: 37886825 DOI: 10.1021/acsami.3c09653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Glasses, when subjected to scratch loading, incur damages affecting their optical and mechanical integrity. Here, it is demonstrated that silica glasses protected with mechanically exfoliated few-layer graphene sheets can exhibit remarkable improvement in scratch resistance. To this extent, the friction and wear characteristics of silica glasses with exfoliated graphene using atomic force microscopy (AFM) are explored. The friction forces recorded during AFM scratch tests of the graphene-glass surfaces at multiple loads exhibit ∼98% reduction compared to that of the bare silica glass, with the friction coefficient falling in the superlubricity regime. This dramatic reduction in friction achieved by the graphene sheets results in significantly lower wear of the graphene-glass surfaces postscratching. Further investigations employing atomistic simulations reveal that the stress-shielding mechanism is due to the reduced deformation of graphene-glass surfaces, thereby curtailing the overall damage. Altogether, the present work provides a new fillip toward the development of glasses with enhanced scratch resistance exploiting two-dimensional coatings.
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Affiliation(s)
- Sourav Sahoo
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Zuhaa Khan
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Department of Metallurgical and Materials Engineering, National Institute of Technology, Srinagar 190006, India
| | - Sajid Mannan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Utkarsh Tiwari
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Zhijiang Ye
- Department of Mechanical and Manufacturing Engineering, Miami University, Oxford, Ohio 45056, United States
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Yardi School of Artificial Intelligence, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Nitya Nand Gosvami
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Yardi School of Artificial Intelligence, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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4
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Bhattoo R, Ranu S, Krishnan NMA. Learning the Dynamics of Particle-based Systems with Lagrangian Graph Neural Networks. Mach Learn : Sci Technol 2023. [DOI: 10.1088/2632-2153/acb03e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Abstract
Physical systems are commonly represented as a combination of particles, the individual dynamics of which govern the system dynamics. However, traditional approaches require the knowledge of several abstract quantities such as the energy or force to infer the dynamics of these particles. Here, we present a framework, namely, Lagrangian graph neural network (LGnn), that provides a strong inductive bias to learn the Lagrangian of a particle-based system directly from the trajectory. We test our approach on challenging systems with constraints and drag—LGnn outperforms baselines such as feed-forward Lagrangian neural network (Lnn) with improved performance. We also show the zero-shot generalizability of the system by simulating systems two orders of magnitude larger than the trained one and also hybrid systems that are unseen by the model, a unique feature. The graph architecture of LGnn significantly simplifies the learning in comparison to Lnn with ~25 times better performance on ~20 times smaller amounts of data. Finally, we show the interpretability of LGnn, which directly provides physical insights on drag and constraint forces learned by the model. LGnn can thus provide a fillip toward understanding the dynamics of physical systems purely from observable quantities.
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5
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Yadav A, Krishnan NMA. Role of steric repulsions on the precipitation kinetics and the structure of calcium-silicate-hydrate gels. Soft Matter 2021; 17:8902-8914. [PMID: 34545899 DOI: 10.1039/d1sm00838b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The microstructure and properties of calcium-silicate-hydrate (C-S-H) gels are largely controlled by the physicochemical environment during their precipitation. However, the role of the steric repulsive environment induced by the pore solution chemistry on the kinetics, structure, and properties of C-S-H gels remains unclear. Here, we develop two potential formalisms, namely sinusoidal and polynomial, to simulate the role of steric repulsions in C-S-H. The results show excellent agreement with experimental observations of precipitation kinetics and elastic properties. We demonstrate that the repulsive interactions result in delayed precipitation and percolation, and an open and branched microstructure. Interestingly, the elastic properties (which are equilibrium properties) are also significantly affected by these second-neighbor interactions. Overall, the present study demonstrates that the kinetics, structure, and equilibrium properties of colloidal gels are controlled by the steric repulsions induced by the chemical environment.
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Affiliation(s)
- Ashish Yadav
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India.
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India.
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, New Delhi, India
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6
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Keshri SR, Ganisetti S, Kumar R, Gaddam A, Illath K, Ajithkumar TG, Balaji S, Annapurna K, Nasani N, Krishnan NMA, Allu AR. Ionic Conductivity of Na 3Al 2P 3O 12 Glass Electrolytes-Role of Charge Compensators. Inorg Chem 2021; 60:12893-12905. [PMID: 34369768 DOI: 10.1021/acs.inorgchem.1c01280] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In glasses, a sodium ion (Na+) is a significant mobile cation that takes up a dual role, that is, as a charge compensator and also as a network modifier. As a network modifier, Na+ cations modify the structural distributions and create nonbridging oxygens. As a charge compensator, Na+ cations provide imbalanced charge for oxygen that is linked between two network-forming tetrahedra. However, the factors controlling the mobility of Na+ ions in glasses, which in turn affects the ionic conductivity, remain unclear. In the current work, using high-fidelity experiments and atomistic simulations, we demonstrate that the ionic conductivity of the Na3Al2P3O12 (Si0) glass material is dependent not only on the concentration of Na+ charge carriers but also on the number of charge-compensated oxygens within its first coordination sphere. To investigate, we chose a series of glasses formulated by the substitution of Si for P in Si0 glass based on the hypothesis that Si substitution in the presence of Na+ cations increases the number of Si-O-Al bonds, which enhances the role of Na as a charge compensator. The structural and conductivity properties of bulk glass materials are evaluated by molecular dynamics (MD) simulations, magic angle spinning-nuclear magnetic resonance, Raman spectroscopy, and impedance spectroscopy. We observe that the increasing number of charge-imbalanced bridging oxygens (BOs) with the substitution of Si for P in Si0 glass enhances the ionic conductivity by an order of magnitude-from 3.7 × 10-8 S.cm-1 to 3.3 × 10-7 S.cm-1 at 100 °C. By rigorously quantifying the channel regions in the glass structure, using MD simulations, we demonstrate that the enhanced ionic conductivity can be attributed to the increased connectivity of Na-rich channels because of the increased charge-compensated BOs around the Na atoms. Overall, this study provides new insights for designing next-generation glass-based electrolytes with superior ionic conductivity for Na-ion batteries.
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Affiliation(s)
- Shweta R Keshri
- Energy Materials and Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India
| | - Sudheer Ganisetti
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Rajesh Kumar
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Anuraag Gaddam
- CICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Santiago University Campus, 3810-193 Aveiro, Portugal
| | - Kavya Illath
- Central NMR Facility and Physical /Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Thalasseril G Ajithkumar
- Central NMR Facility and Physical /Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sathravada Balaji
- Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India
| | - K Annapurna
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.,Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India
| | - Narendar Nasani
- Centre for Materials for Electronics Technology (C-MET), (Under Ministry of Electronics & Information Technology (MeitY), Govt. of India), IDA Phase - III, Cherlapally, HCL Post Hyderabad 500 051 Telangana, India
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.,Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Amarnath R Allu
- Energy Materials and Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata 700032, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Venugopal V, Sahoo S, Zaki M, Agarwal M, Gosvami NN, Krishnan NMA. Looking through glass: Knowledge discovery from materials science literature using natural language processing. Patterns (N Y) 2021; 2:100290. [PMID: 34286304 PMCID: PMC8276010 DOI: 10.1016/j.patter.2021.100290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 05/10/2021] [Accepted: 05/24/2021] [Indexed: 02/06/2023]
Abstract
Most of the knowledge in materials science literature is in the form of unstructured data such as text and images. Here, we present a framework employing natural language processing, which automates text and image comprehension and precision knowledge extraction from inorganic glasses' literature. The abstracts are automatically categorized using latent Dirichlet allocation (LDA) to classify and search semantically linked publications. Similarly, a comprehensive summary of images and plots is presented using the caption cluster plot (CCP), providing direct access to images buried in the papers. Finally, we combine the LDA and CCP with chemical elements to present an elemental map, a topical and image-wise distribution of elements occurring in the literature. Overall, the framework presented here can be a generic and powerful tool to extract and disseminate material-specific information on composition-structure-processing-property dataspaces, allowing insights into fundamental problems relevant to the materials science community and accelerated materials discovery.
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Affiliation(s)
- Vineeth Venugopal
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Corresponding author
| | - Sourav Sahoo
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Mohd Zaki
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Manish Agarwal
- Computer Services Center, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Nitya Nand Gosvami
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - N. M. Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Corresponding author
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Ranjith P, Sreevalsa S, Patra P, Som S, Menon A, Jayanthi K, Annapurna K, Krishnan NMA, Allu AR, Das S. Realizing cool and warm white-LEDs based on color controllable (Sr,Ba) 2Al 3O 6F:Eu 2+ phosphors obtained via a microwave-assisted diffusion method. Phys Chem Chem Phys 2021; 23:15245-15256. [PMID: 34236065 DOI: 10.1039/d1cp01593a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Globally, phosphor converted white-LEDs (W-LEDs) are among the most suitable sources to reduce energy consumption. Nevertheless, modernization of efficient broadband emitting phosphors is most crucial to improve the W-LED performance. Herein, we synthesized a series of novel broadband emitting Sr2-xAl3O6F:xEu2+ phosphors via a new microwave-assisted diffusion method. Rietveld refinement of the obtained X-ray diffraction results was performed to recognize the exact crystal phase and the various cationic sites. Oxygen vacancies (VO) formed under synthetic reducing conditions enabled Sr2Al3O6F to demonstrate bright self-activated bluish emission. Doping of Eu2+ ions unlocked the energy transfer process from the host to the activator ions, owing to which, the self-activated emission diminished and the Eu2+-doped sample showed amplified bluish-green emission. The gradual increase in Eu2+ concentrations regulated the controllable emissions from the bluish (0.34, 0.42) to the greenish (0.38, 0.43) zone under UV excitation. Because of the different absorption preferences of Eu2+ ions located at the different Sr2+ sites, Sr2-xAl3O6F:xEu2+ exhibited bluish-white emission under blue irradiation. A further enhancement in PL intensity had been observed by the cation substitution of Ba2+ for Sr2+ sites in the optimum Sr1.95Al3O6F:0.05Eu2+ phosphor. The as-fabricated W-LEDs utilizing the optimized Sr1.75Ba0.2Al3O6F:0.05Eu2+ phosphor exhibited a cool-white light emission along with a 372 nm NUV-LED and a 420 nm blue-LED with a moderate CRI of 70 and a CCT above 6000 K. Such cool white emission was controlled to natural white with the CCT close to 5000 K, and the CRI above 80 via utilizing a suitable red emitting phosphor. The W-LED performances of the optimized phosphor justified its applicability to produce white light for lighting applications.
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Affiliation(s)
- P Ranjith
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala-695019, India.
| | - S Sreevalsa
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala-695019, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pritha Patra
- Specialty Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, West Bengal 700032, India
| | - Sudipta Som
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Ammu Menon
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
| | - K Jayanthi
- School of Molecular Science and Center for Materials of the Universe, Arizona State University, Tempe, AZ 85287, USA
| | - K Annapurna
- Specialty Glass Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, West Bengal 700032, India
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India and Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India
| | - Amarnath R Allu
- Energy Materials and Devices Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, West Bengal, 700032, India.
| | - Subrata Das
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala-695019, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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9
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Lyngdoh GA, Kumar R, Krishnan NMA, Das S. Dynamics of confined water and its interplay with alkali cations in sodium aluminosilicate hydrate gel: insights from reactive force field molecular dynamics. Phys Chem Chem Phys 2020; 22:23707-23724. [PMID: 33057524 DOI: 10.1039/d0cp04646a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper presents the dynamics of confined water and its interplay with alkali cations in disordered sodium aluminosilicate hydrate (N-A-S-H) gel using reactive force field molecular dynamics. N-A-S-H gel is the primary binding phase in geopolymers formed via alkaline activation of fly ash. Despite attractive mechanical properties, geopolymers suffer from durability issues, particularly the alkali leaching problem which has motivated this study. Here, the dynamics of confined water and the mobility of alkali cations in N-A-S-H is evaluated by obtaining the evolution of mean squared displacements and Van Hove correlation function. To evaluate the influence of the composition of N-A-S-H on the water dynamics and diffusion of alkali cations, atomistic structures of N-A-S-H with Si/Al ratio ranging from 1 to 3 are constructed. It is observed that the diffusion of confined water and sodium is significantly influenced by the Si/Al ratio. The confined water molecules in N-A-S-H exhibit a multistage dynamic behavior where they can be classified as mobile and immobile water molecules. While the mobility of water molecules gets progressively restricted with an increase in Si/Al ratio, the diffusion coefficient of sodium also decreases as the Si/Al ratio increases. The diffusion coefficient of water molecules in the N-A-S-H structure exhibits a lower value than those of the calcium-silicate-hydrate (C-S-H) structure. This is mainly due to the random disordered structure of N-A-S-H as compared to the layered C-S-H structure. To further evaluate the influence of water content in N-A-S-H, atomistic structures of N-A-S-H with water contents ranging from 5-20% are constructed. Qn distribution of the structures indicates significant depolymerization of N-A-S-H structure with increasing water content. Increased conversion of Si-O-Na network to Si-O-H and Na-OH components with an increase in water content helps explain the alkali-leaching issue in fly ash-based geopolymers observed macroscopically. Overall, the results in this study can be used as a starting point towards multiscale simulation-based design and development of durable geopolymers.
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Affiliation(s)
- Gideon A Lyngdoh
- Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, RI, USA.
| | - Rajesh Kumar
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India.
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India. and Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Sumanta Das
- Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, RI, USA.
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Wang Z, Du T, Anoop Krishnan NM, Smedskjaer MM, Bauchy M. On the equivalence of vapor-deposited and melt-quenched glasses. J Chem Phys 2020; 152:164504. [DOI: 10.1063/5.0006590] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Zhe Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Tao Du
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
- School of Civil Engineering, Harbin Institute of Technology, 150090 Harbin, China
| | - N. M. Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Morten M. Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
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Nayak S, Ravinder R, Krishnan NMA, Das S. A Peridynamics-Based Micromechanical Modeling Approach for Random Heterogeneous Structural Materials. Materials (Basel) 2020; 13:E1298. [PMID: 32183016 PMCID: PMC7143128 DOI: 10.3390/ma13061298] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/03/2020] [Accepted: 03/04/2020] [Indexed: 12/03/2022]
Abstract
This paper presents a peridynamics-based micromechanical analysis framework that can efficiently handle material failure for random heterogeneous structural materials. In contrast to conventional continuum-based approaches, this method can handle discontinuities such as fracture without requiring supplemental mathematical relations. The framework presented here generates representative unit cells based on microstructural information on the material and assigns distinct material behavior to the constituent phases in the random heterogenous microstructures. The framework incorporates spontaneous failure initiation/propagation based on the critical stretch criterion in peridynamics and predicts effective constitutive response of the material. The current framework is applied to a metallic particulate-reinforced cementitious composite. The simulated mechanical responses show excellent match with experimental observations signifying efficacy of the peridynamics-based micromechanical framework for heterogenous composites. Thus, the multiscale peridynamics-based framework can efficiently facilitate microstructure guided material design for a large class of inclusion-modified random heterogenous materials.
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Affiliation(s)
- Sumeru Nayak
- Civil and Environmental Engineering, University of Rhode Island, Kingston, RI 02881, USA;
| | - R Ravinder
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India;
| | - N M Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India;
| | - Sumanta Das
- Civil and Environmental Engineering, University of Rhode Island, Kingston, RI 02881, USA;
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Ravinder R, Garg P, Krishnan NMA. Hexagonal Boron Nitride: Glass Transition and Crystallization in Hexagonal Boron Nitride: Crucial Role of Orientational Order (Adv. Theory Simul. 2/2020). Adv Theory Simul 2020. [DOI: 10.1002/adts.202070003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Ravinder R, Garg P, Krishnan NMA. Glass Transition and Crystallization in Hexagonal Boron Nitride: Crucial Role of Orientational Order. Adv Theory Simul 2019. [DOI: 10.1002/adts.201900174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- R. Ravinder
- Department of Civil EngineeringIndian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - Prateet Garg
- Department of Civil EngineeringIndian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
| | - N. M. Anoop Krishnan
- Department of Civil EngineeringIndian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
- Department of Materials Science and EngineeringIndian Institute of Technology Delhi Hauz Khas New Delhi 110016 India
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Dhawan S, Ghosh S, Ravinder R, Bais SS, Basak S, Krishnan NMA, Agarwal M, Banerjee M, Haridas V. Redox Sensitive Self-Assembling Dipeptide for Sustained Intracellular Drug Delivery. Bioconjug Chem 2019; 30:2458-2468. [DOI: 10.1021/acs.bioconjchem.9b00532] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
| | | | | | - Sachendra S. Bais
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi-110067, India
| | - Soumen Basak
- National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi-110067, India
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15
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Lyngdoh GA, Kumar R, Krishnan NMA, Das S. Realistic atomic structure of fly ash-based geopolymer gels: Insights from molecular dynamics simulations. J Chem Phys 2019. [DOI: 10.1063/1.5121519] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Affiliation(s)
- Gideon A. Lyngdoh
- Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, Rhode Island 02881, USA
| | - Rajesh Kumar
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - N. M. Anoop Krishnan
- Department of Civil Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
- Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Sumanta Das
- Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, Rhode Island 02881, USA
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Ganisetti S, Gaddam A, Kumar R, Balaji S, Mather GC, Pascual MJ, Fabian M, Siegel R, Senker J, Kharton VV, Guénolé J, Krishnan NMA, Ferreira JMF, Allu AR. Elucidating the formation of Al–NBO bonds, Al–O–Al linkages and clusters in alkaline-earth aluminosilicate glasses based on molecular dynamics simulations. Phys Chem Chem Phys 2019; 21:23966-23977. [DOI: 10.1039/c9cp04332b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Exploring the reasons for the initiation of Al–O–Al bond formation in alkali-earth alumino silicate glasses is a key topic in the glass-science community.
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Affiliation(s)
- Sudheer Ganisetti
- Department of Materials Science and Engineering
- Institute I
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- 91058 Erlangen
- Germany
| | - Anuraag Gaddam
- Department of Materials and Ceramic Engineering
- CICECO
- University of Aveiro
- 3810–193 Aveiro
- Portugal
| | - Rajesh Kumar
- Department of Civil Engineering
- Indian Institute of Technology Delhi
- India 110016
| | - Sathravada Balaji
- Glass Division
- CSIR-Central Glass and Ceramic Research Institute
- Kolkata
- India
| | | | | | - Margit Fabian
- Centre for Energy Research
- Hungarian Academy of Sciences
- Hungary
| | - Renée Siegel
- Inorganic Chemistry III
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | - Jürgen Senker
- Inorganic Chemistry III
- University of Bayreuth
- 95440 Bayreuth
- Germany
| | | | - Julien Guénolé
- Institute of Physical Metallurgy and Materials Physics
- RWTH Aachen University
- 52056 Aachen
- Germany
| | | | - José M. F. Ferreira
- Department of Civil Engineering
- Indian Institute of Technology Delhi
- India 110016
| | - Amarnath R. Allu
- Glass Division
- CSIR-Central Glass and Ceramic Research Institute
- Kolkata
- India
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17
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Yang K, Kachmar A, Wang B, Krishnan NMA, Balonis M, Sant G, Bauchy M. New insights into the atomic structure of amorphous TiO 2 using tight-binding molecular dynamics. J Chem Phys 2018; 149:094501. [PMID: 30195301 DOI: 10.1063/1.5042783] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Amorphous TiO2 (a-TiO2) could offer an attractive alternative to conventional crystalline TiO2 phases for photocatalytic applications. However, the atomic structure of a-TiO2 remains poorly understood with respect to that of its crystalline counterparts. Here, we conduct some classical molecular dynamics simulations of a-TiO2 based on a selection of empirical potentials. We show that, on account of its ability to dynamically assign the charge of each atom based on its local environment, the second-moment tight-binding charge equilibration potential yields an unprecedented agreement with available experimental data. Based on these simulations, we investigate the degree of order and disorder in a-TiO2. Overall, the results suggest that a-TiO2 features a large flexibility in its local topology, which may explain the high sensitivity of its structure to the synthesis method being used.
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Affiliation(s)
- Kai Yang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Ali Kachmar
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
| | - Bu Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - N M Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Magdalena Balonis
- Department of Materials Science and Engineering, University of California, Los Angeles, California 90095-1593, USA
| | - Gaurav Sant
- Department of Materials Science and Engineering, University of California, Los Angeles, California 90095-1593, USA
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
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Yu Y, Krishnan NMA, Smedskjaer MM, Sant G, Bauchy M. The hydrophilic-to-hydrophobic transition in glassy silica is driven by the atomic topology of its surface. J Chem Phys 2018; 148:074503. [DOI: 10.1063/1.5010934] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yingtian Yu
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - N. M. Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Morten M. Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark
| | - Gaurav Sant
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
- California Nanosystems Institute (CNSI), University of California, Los Angeles, California 90095, USA
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
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19
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Anoop Krishnan NM, Ghosh D. Mechanics of Metal-Nanocomposites at Multiple Length Scales: Case of Al-BNNT. J Nanomech Micromech 2017. [DOI: 10.1061/(asce)nm.2153-5477.0000129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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20
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Hsiao YH, La Plante EC, Krishnan NMA, Le Pape Y, Neithalath N, Bauchy M, Sant G. Effects of Irradiation on Albite’s Chemical Durability. J Phys Chem A 2017; 121:7835-7845. [DOI: 10.1021/acs.jpca.7b05098] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | - Yann Le Pape
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Narayanan Neithalath
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, Arizona 85287, United States
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Krishnan NMA, Wang B, Sant G, Phillips JC, Bauchy M. Revealing the Effect of Irradiation on Cement Hydrates: Evidence of a Topological Self-Organization. ACS Appl Mater Interfaces 2017; 9:32377-32385. [PMID: 28870068 DOI: 10.1021/acsami.7b09405] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Despite the crucial role of concrete in the construction of nuclear power plants, the effects of radiation exposure (i.e., in the form of neutrons) on the calcium-silicate-hydrate (C-S-H, i.e., the glue of concrete) remain largely unknown. Using molecular dynamics simulations, we systematically investigate the effects of irradiation on the structure of C-S-H across a range of compositions. Expectedly, although C-S-H is more resistant to irradiation than typical crystalline silicates, such as quartz, we observe that radiation exposure affects C-S-H's structural order, silicate mean chain length, and the amount of molecular water that is present in the atomic network. By topological analysis, we show that these "structural effects" arise from a self-organization of the atomic network of C-S-H upon irradiation. This topological self-organization is driven by the (initial) presence of atomic eigenstress in the C-S-H network and is facilitated by the presence of water in the network. Overall, we show that C-S-H exhibits an optimal resistance to radiation damage when its atomic network is isostatic (at Ca/Si = 1.5). Such an improved understanding of the response of C-S-H to irradiation can pave the way to the design of durable concrete for radiation applications.
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Affiliation(s)
| | | | | | - James C Phillips
- Department of Physics and Astronomy, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854-8019, United States
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22
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Li X, Song W, Yang K, Krishnan NMA, Wang B, Smedskjaer MM, Mauro JC, Sant G, Balonis M, Bauchy M. Cooling rate effects in sodium silicate glasses: Bridging the gap between molecular dynamics simulations and experiments. J Chem Phys 2017; 147:074501. [DOI: 10.1063/1.4998611] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Affiliation(s)
- Xin Li
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Weiying Song
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Kai Yang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - N. M. Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Bu Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
| | - Morten M. Smedskjaer
- Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark
| | - John C. Mauro
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Gaurav Sant
- Laboratory for the Chemistry of Construction Materials, University of California, Los Angeles, California 90095-1593, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, California 90095-1593, USA
- Institute for Technology Advancement, University of California, Los Angeles, California 90095-1593, USA
| | - Magdalena Balonis
- Department of Materials Science and Engineering, University of California, Los Angeles, California 90095-1593, USA
- Institute for Technology Advancement, University of California, Los Angeles, California 90095-1593, USA
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), University of California, Los Angeles, California 90095-1593, USA
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Bauchy M, Wang M, Yu Y, Wang B, Krishnan NMA, Masoero E, Ulm FJ, Pellenq R. Topological Control on the Structural Relaxation of Atomic Networks under Stress. Phys Rev Lett 2017; 119:035502. [PMID: 28777608 DOI: 10.1103/physrevlett.119.035502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Indexed: 06/07/2023]
Abstract
Upon loading, atomic networks can feature delayed irreversible relaxation. However, the effect of composition and structure on relaxation remains poorly understood. Herein, relying on accelerated molecular dynamics simulations and topological constraint theory, we investigate the relationship between atomic topology and stress-induced structural relaxation, by taking the example of creep deformations in calcium silicate hydrates (C─S─H), the binding phase of concrete. Under constant shear stress, C─S─H is found to feature delayed logarithmic shear deformations. We demonstrate that the propensity for relaxation is minimum for isostatic atomic networks, which are characterized by the simultaneous absence of floppy internal modes of relaxation and eigenstress. This suggests that topological nanoengineering could lead to the discovery of nonaging materials.
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Affiliation(s)
- Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Mengyi Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Yingtian Yu
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Bu Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - N M Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Enrico Masoero
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - Franz-Joseph Ulm
- Concrete Sustainability Hub, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
- MIT-CNRS joint laboratory at Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Roland Pellenq
- Concrete Sustainability Hub, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
- MIT-CNRS joint laboratory at Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
- Centre Interdisciplinaire des Nanosciences de Marseille, CNRS and Aix-Marseille University, Campus de Luminy, Marseille, 13288 Cedex 09, France
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Krishnan NMA, Wang B, Le Pape Y, Sant G, Bauchy M. Irradiation- vs. vitrification-induced disordering: The case of𝜶-quartz and glassy silica. J Chem Phys 2017; 146:204502. [DOI: 10.1063/1.4982944] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- N. M. Anoop Krishnan
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Bu Wang
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
- Laboratory for the Chemistry of Construction Materials (LC), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
| | - Yann Le Pape
- Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6148, USA
| | - Gaurav Sant
- Laboratory for the Chemistry of Construction Materials (LC), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
- California Nanosystems Institute (CNSI), University of California, Los Angeles, California 90095, USA
| | - Mathieu Bauchy
- Physics of AmoRphous and Inorganic Solids Laboratory (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, USA
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Krishnan NMA, Wang B, Falzone G, Le Pape Y, Neithalath N, Pilon L, Bauchy M, Sant G. Confined Water in Layered Silicates: The Origin of Anomalous Thermal Expansion Behavior in Calcium-Silicate-Hydrates. ACS Appl Mater Interfaces 2016; 8:35621-35627. [PMID: 27977137 DOI: 10.1021/acsami.6b11587] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Water, under conditions of nanoscale confinement, exhibits anomalous dynamics, and enhanced thermal deformations, which may be further enhanced when such water is in contact with hydrophilic surfaces. Such heightened thermal deformations of water could control the volume stability of hydrated materials containing nanoconfined structural water. Understanding and predicting the thermal deformation coefficient (TDC, often referred to as the CTE, coefficient of thermal expansion), which represents volume changes induced in materials under conditions of changing temperature, is of critical importance for hydrated solids including: hydrogels, biological tissues, and calcium silicate hydrates, as changes in their volume can result in stress development, and cracking. By pioneering atomistic simulations, we examine the physical origin of thermal expansion in calcium-silicate-hydrates (C-S-H), the binding agent in concrete that is formed by the reaction of cement with water. We report that the TDC of C-S-H shows a sudden increase when the CaO/SiO2 (molar ratio; abbreviated as Ca/Si) exceeds 1.5. This anomalous behavior arises from a notable increase in the confinement of water contained in the C-S-H's nanostructure. We identify that confinement is dictated by the topology of the C-S-H's atomic network. Taken together, the results suggest that thermal deformations of hydrated silicates can be altered by inducing compositional changes, which in turn alter the atomic topology and the resultant volume stability of the solids.
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Affiliation(s)
- N M Anoop Krishnan
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
- Laboratory for the Physics of Amorphous and Inorganic Solids (PARISlab), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
| | - Bu Wang
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
- Laboratory for the Physics of Amorphous and Inorganic Solids (PARISlab), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
| | - Gabriel Falzone
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
| | - Yann Le Pape
- Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
| | - Narayanan Neithalath
- School of Sustainable Engineering and the Built Environment, Arizona State University , Tempe, Arizona 85281, United States
| | - Laurent Pilon
- Department of Mechanical and Aerospace Engineering, University of California , Los Angeles, California 90095, United States
| | - Mathieu Bauchy
- Laboratory for the Physics of Amorphous and Inorganic Solids (PARISlab), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
| | - Gaurav Sant
- Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California , Los Angeles, California 90095, United States
- California Nanosystems Institute (CNSI), University of California , Los Angeles, California 90095, United States
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