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Nair ASR, Devi S, Mandal S, Tripathi UK, Roy D, Prasad NE. Insights into enzymatic degradation of physically crosslinked hydrogels anchored by functionalized carbon nanofillers. NEW J CHEM 2022. [DOI: 10.1039/d1nj04924k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Immobilization of hydrophobic enzymes on the surface of nanofillers disturbs the non-covalent interactions of polymer–filler networks and destabilizes physically crosslinked hydrogels.
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Affiliation(s)
- Adwaita SR Nair
- Directorate of Nanomaterials, DMSRDE, Kanpur, 208013, India
- Nanoscience & Technology, Central University of Jharkhand, 835222, India
| | - Sudeepa Devi
- Directorate of Nanomaterials, DMSRDE, Kanpur, 208013, India
- Janta Maha Vidyalaya (CSJM University), Ajitmal, Auraiya, 206121, India
| | - Subhash Mandal
- Directorate of Nanomaterials, DMSRDE, Kanpur, 208013, India
| | | | - Debmalya Roy
- Directorate of Nanomaterials, DMSRDE, Kanpur, 208013, India
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Meng Q, Han S, Liu T, Ma J, Ji S, Dai J, Kang H, Ma J. Noncovalent Modification of Boron Nitrite Nanosheets for Thermally Conductive, Mechanically Resilient Epoxy Nanocomposites. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c03133] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Qingshi Meng
- College of Aerospace Engineering, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, Liaoning 110136, China
| | - Sensen Han
- College of Aerospace Engineering, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, Liaoning 110136, China
| | - Tianqing Liu
- NICM Health Research Institute, Western Sydney University, Westmead 2145, Australia
| | - Jian Ma
- Administrative Department, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, Liaoning 110136, China
| | - Shude Ji
- College of Aerospace Engineering, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, Liaoning 110136, China
| | - Jiabin Dai
- University of South Australia, UniSA STEM, Mawson Lakes, SA 5095, Australia
| | - Hailan Kang
- School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China
| | - Jun Ma
- College of Aerospace Engineering, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, Liaoning 110136, China
- University of South Australia, UniSA STEM, Mawson Lakes, SA 5095, Australia
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Effect of Particle Orientation and Porosity on Thermal Conductivity of Petroleum Pitch Polymer-Based Carbon Molded Body. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10207281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The present study was conducted to investigate changes in the thermal conductivity of petroleum pitch-based carbon molded bodies prepared by anisotropic (uniaxial) molding under different molding pressures. The carbon molded bodies were prepared using needle coke and petroleum-based binder pitch polymers (softening point: 150 ℃). Green blocks prepared under high molding pressure showed a higher particle orientation value up to 16.4 μm. Graphite blocks, prepared by graphitizing the green blocks at 2800 ℃ showed a similar trend. The pores in the carbon molded body were filled with low boiling point substances, generated by the thermal treatment of the binder pitch polymer or air that could not be discharged during the molding procedure. Therefore, when phonons encountered a pore, phonon scattering, rather than phonon transport, occurred, and thus the heat transport from the hot zone to a cold zone became slow. As a result, although the particle orientation was a little higher in the B_10-G sample than in the B_20-G sample (in the error range), the thermal conductivity was higher in the B_20-G sample, which may be because the B_10-G sample had a higher porosity than the B_20-G sample.
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Janghela S, Devi S, Kambo N, Roy D, Eswara Prasad N. Understanding fluorometric interactions in ion-responsive sustainable polymer nanocomposite scaffolds. SOFT MATTER 2020; 16:8667-8676. [PMID: 32869046 DOI: 10.1039/d0sm00965b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The fluorescent colour in biodegradable and biocompatible flexible polymer nanocomposite gels was modulated in order to gain insight into the interfacial interactions of functional scaffolds with metal ions. The hybrid nanomaterials were introduced into the polymer matrix to obtain mechanically robust porous morphologies where the intrinsic luminescence matrix was found to critically enhance the threshold of the visual detection limits. The quenching of fluorescence intensity has been predominantly attributed to the interactions of functional receptors of luminescent nanofillers with respect to the chromophores of the fluorescent matrix. The chromium ion is selected to understand the change in fluorescence intensity of the nanocomposite gel with the degree of metal ion adsorption. The number of functional nanomaterials loaded into the matrix and the luminescence nature of the base polymer are varied with the purpose of gaining insight into the remote sensing mechanism of the colorimetric fluorescent probe.
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Affiliation(s)
- Shriram Janghela
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur-13, India. and Department of Textile Technology, UPTTI, Kanpur-208001, India
| | - Sudeepa Devi
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur-13, India.
| | - Neelu Kambo
- Department of Textile Technology, UPTTI, Kanpur-208001, India
| | - Debmalya Roy
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur-13, India.
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Mandal S, Roy D, Prasad NE, Joshi M. Interfacial interactions and properties of cellular structured polyurethane nanocomposite based on carbonaceous nano‐fillers. J Appl Polym Sci 2020. [DOI: 10.1002/app.49775] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Subhash Mandal
- Department of Textile and Fibre Engineering Indian Institute of Technology Delhi New Delhi India
- Directorate of Nanomaterials and Technologies (DNMAT) Defence Materials and Stores Research and Development Establishment (DMSRDE), DRDO Kanpur India
| | - Debmalya Roy
- Directorate of Nanomaterials and Technologies (DNMAT) Defence Materials and Stores Research and Development Establishment (DMSRDE), DRDO Kanpur India
| | | | - Mangala Joshi
- Department of Textile and Fibre Engineering Indian Institute of Technology Delhi New Delhi India
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Janghela S, Devi S, Kambo N, Roy D, Mukhopadhyay K, Prasad NE. Microphase separation in oriented polymeric chains at the surface of nanomaterials during nanofiber formation. SOFT MATTER 2019; 15:6811-6818. [PMID: 31424069 DOI: 10.1039/c9sm01250h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The presence of low-dimensional functional nanofillers during the formation of morphological phase boundaries in polymeric nanofibers by electrospinning was highlighted in this study. PAN and TPU were both selected with differential viscosities to understand the phase-segregated internal supramolecular structures on functional surfaces of different length scales. The low-dimensional carbon nanofillers displayed a significant role in the topological orientation of the polymeric chains in TPU due to the presence of hard and soft segments in the geometry of TPU. The nano-hybrid shish-kebab-type microphase separation was observed on 1D nanofillers, whereas the anisotropic hierarchical microdomains were formed in the presence of 0D nanofillers. The 2D functional surface produced highly folded nanoscale lamellae by molecular interactions with polymeric chains. By combining different dimensional nanofillers, the hybrid 1D-2D networks created multifaceted structural hierarchies with epitaxial growth on the planar surface and shish-kebab geometry on the 1D functional backbone. Our study has demonstrated the significance of the configuration of nanoscale functional surfaces on the texture of polymeric chain assemblies during electrospinning for controlled flexible scaffolds.
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Affiliation(s)
- Shriram Janghela
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur, 208013, India.
| | - Sudeepa Devi
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur, 208013, India.
| | - Neelu Kambo
- Department of Textile Technology, UPTTI, Kanpur, 208001, India
| | - Debmalya Roy
- Directorate of Nanomaterials & Technologies, DMSRDE, Kanpur, 208013, India.
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Islam AM, Lim H, You NH, Ahn S, Goh M, Hahn JR, Yeo H, Jang SG. Enhanced Thermal Conductivity of Liquid Crystalline Epoxy Resin using Controlled Linear Polymerization. ACS Macro Lett 2018; 7:1180-1185. [PMID: 35651269 DOI: 10.1021/acsmacrolett.8b00456] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A powerful strategy to enhance the thermal conductivity of liquid crystalline epoxy resin (LCER) by simply replacing the conventional amine cross-linker with a cationic initiator was developed. The cationic initiator linearly wove the epoxy groups tethered on the microscopically aligned liquid crystal mesogens, resulting in freezing of the ordered LC microstructures even after curing. Owing to the reduced phonon scattering during heat transport through the ordered LC structure, a dramatic improvement in the thermal conductivity of neat cation-cured LCER was achieved to give a value ∼141% (i.e., 0.48 W/mK) higher than that of the amorphous amine-cured LCER. In addition, at the same composite volume fraction in the presence of a 2-D boron nitride filler, an approximately 130% higher thermal conductivity (maximum ∼23 W/mK at 60 vol %) was observed. The nanoarchitecture effect of the ordered LCER on the thermal conductivity was then examined by a systematic investigation using differential scanning calorimetry, polarized optical microscopy, X-ray diffraction, and thermal conductivity measurements. The linear polymerization of LCER can therefore be considered a practical strategy to enable the cost-efficient mass production of heat-dissipating materials, due to its high efficiency and simple process without the requirement for complex equipment.
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Affiliation(s)
- Akherul Md. Islam
- Department of Chemistry and Department of Bioactive Material Sciences and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | | | | | | | | | - Jae Ryang Hahn
- Department of Chemistry and Department of Bioactive Material Sciences and Research Institute of Physics and Chemistry, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Hyeonuk Yeo
- Department of Chemistry Education, Kyungpook National University, Daegu 41566, Republic of Korea
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Bhattacharyya R, Janghela S, Saraiya A, Roy D, Mukhopadhyay K, Prasad NE. Effect of Reinforcement at Length Scale for Polyurethane Cellular Scaffolds by Supramolecular Assemblies. J Phys Chem B 2018; 122:2683-2693. [PMID: 29376384 DOI: 10.1021/acs.jpcb.7b11978] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
This study is aimed to represent the role of carbonaceous nanofillers to reinforce the commercially available polyurethane porous structure. The effect of dimensionality of fillers to anchor the construction of stable three-dimensional (3D) cellular architectures has been highlighted. The cellular frameworks of commercially available thermoplastic polyurethane (TPU) have been fabricated through the thermoreversible supramolecular self-assembly route. It was established that the minimum shrinkage of TPU lattice structures occurred when the solid-state network is strengthened by the topologically engineered 3D hierarchical nanofillers, where the amount of reinforcement was found to play a critical role. It has been established by series of structure-property correlations that reinforcing the cellular structure to endure the capillary stress is equally effective as supercritical drying for producing low-density porous morphologies. The removal of liquid phase from gel is as important as the presence of 3D fillers in the matrix for reinforcing the cellular structures when replacing the solvent phase with air to generate a two-phase solid-gas engineered morphology. The insight into the polyurethane network structure revealed that the dimensionality, amount, and distribution of fillers in the matrix are critical for reinforcing the cellular scaffolds in solid gel without any cross-linking.
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Affiliation(s)
- Ruma Bhattacharyya
- Directorate of Nanomaterials and Technologies , DMSRDE , GT Road , Kanpur 208013 , India
| | - Shriram Janghela
- Directorate of Nanomaterials and Technologies , DMSRDE , GT Road , Kanpur 208013 , India
| | - Amit Saraiya
- Directorate of Nanomaterials and Technologies , DMSRDE , GT Road , Kanpur 208013 , India
| | - Debmalya Roy
- Directorate of Nanomaterials and Technologies , DMSRDE , GT Road , Kanpur 208013 , India
| | - Kingsuk Mukhopadhyay
- Directorate of Nanomaterials and Technologies , DMSRDE , GT Road , Kanpur 208013 , India
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Investigation of thermal energy transport interface of hybrid graphene-carbon nanotube/polyethylene nanocomposites. Sci Rep 2017; 7:14700. [PMID: 29089620 PMCID: PMC5666017 DOI: 10.1038/s41598-017-14710-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 10/13/2017] [Indexed: 12/02/2022] Open
Abstract
It is well known the thermal properties of three-dimensional (3-D) hybrid graphene (GR)-carbon nanotube (CNT) structures are not superior to that of the individual GR and CNT, however, the 3-D hybrid GR-CNT structures can effectively improve the thermal properties of polymer matrix. Therefore, understanding the thermal energy transport in the interface between polymer matrix and 3-D hybrid GR-CNT structure is essential. Here, the enhancement mechanism of interfacial thermal transport of hybrid GR-CNT structure was explored by applying non-equilibrium molecular dynamics (NEMD) simulations. Three different types of hybrid GR-CNT structures were built. The influences of CNT radius and CNT type for the hybrid GR-CNT on the interfacial thermal properties were also analyzed. Computational results show that among the three different types of hybrid GR-CNT structures, the Model-I, i.e., the covalent bond hybrid GR-CNT structures are of the best interfacial thermal properties. Meanwhile, the CNT radius of hybrid GR-CNT structure has a great influence on the interfacial thermal properties.
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