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Nawaz F, Ali M, Ahmad S, Yong Y, Rahman S, Naseem M, Hussain S, Razzaq A, Khan A, Ali F, Al Balushi RA, Al-Hinaai MM, Ali N. Carbon based nanocomposites, surface functionalization as a promising material for VOCs (volatile organic compounds) treatment. CHEMOSPHERE 2024; 364:143014. [PMID: 39121955 DOI: 10.1016/j.chemosphere.2024.143014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 07/23/2024] [Accepted: 08/02/2024] [Indexed: 08/12/2024]
Abstract
Urban residential and industrial growth development affects sustainable and healthful indoor environments. Environmental issues are a global problem. The deterioration of indoor air quality has prompted the creation of several air cleansing techniques. This review explains how carbon-based materials have influenced the development of air purification systems using photocatalysis. These carbon-based materials offer unique properties and advantages in VOC removal processes. Biochar, produced from biomass pyrolysis, provides an environmentally sustainable solution with its porous structure and carbon-rich composition. Carbon quantum dots, with their quantum confinement effects and tunable surface properties, show promise in VOC sensing and removal applications. Polymers incorporating reduced graphene oxide demonstrate enhanced adsorption capabilities owing to the synergistic effects of graphene and polymer matrices. Activated carbon fibers, characterized by their high aspect ratio and interconnected porosity, provide efficient VOC removal with rapid kinetics. With their unique electronic and structural properties, graphitic carbon nitrides offer opportunities for photocatalytic degradation of VOCs under visible light. Catalysts integrated with MXene, a two-dimensional nanomaterial, exhibit enhanced catalytic activity for VOC oxidation reactions. Using various carbon-based materials in VOC removal showcases the versatility and effectiveness of carbon-based approaches in addressing environmental challenges associated with indoor air pollution. Metal-organic-framework materials are carbon-based compounds. It examines the correlation between VOC mineralization and specific characteristics of carbon materials, including surface area, adsorption capability, surface functional groups, and optoelectronic properties. Discussions include the basics of PCO, variables influencing how well catalysts degrade, and degradation mechanisms. It explores how technology will improve in the future to advance studies on healthy and sustainable indoor air quality.
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Affiliation(s)
- Farooq Nawaz
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Muhammad Ali
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Shakeel Ahmad
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Yang Yong
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Suhaib Rahman
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Muhammad Naseem
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Sadam Hussain
- Department of Chemistry, School of Natural Sciences, National University of Sciences and Technology(NUST), Islamabad, 44000, Pakistan.
| | - Abdul Razzaq
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China.
| | - Adnan Khan
- Institute of Chemical Sciences, University of Peshawar, Khyber Pakhtunkhwa, 25120, Pakistan.
| | - Farman Ali
- Department of Chemistry, Hazara University, Mansehra, 21300, Pakistan.
| | - Rayya Ahmed Al Balushi
- Department of Basic and Applied Sciences, College of Applied and Health Sciences, A'Sharqiyah University, P.O. Box 42, Ibra P.O. 400, Sultanate of Oman.
| | - Mohammad M Al-Hinaai
- Department of Basic and Applied Sciences, College of Applied and Health Sciences, A'Sharqiyah University, P.O. Box 42, Ibra P.O. 400, Sultanate of Oman.
| | - Nisar Ali
- National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huai'an, 223003, China; Department of Basic and Applied Sciences, College of Applied and Health Sciences, A'Sharqiyah University, P.O. Box 42, Ibra P.O. 400, Sultanate of Oman.
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Hotton C, Le Roux L, Goldmann C, Rouzière S, Launois P, Bizien T, Paineau E. Colloidal phase behavior of high aspect ratio clay nanotubes in symmetric and asymmetric electrolytes. J Colloid Interface Sci 2024; 664:857-867. [PMID: 38493651 DOI: 10.1016/j.jcis.2024.03.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 03/06/2024] [Accepted: 03/07/2024] [Indexed: 03/19/2024]
Abstract
HYPOTHESIS Imogolite nanotubes (INTs) are unique anisometric particles with monodisperse nanometric diameters. Aluminogermanate double-walled INTs (Ge-DWINTs) are obtained with variable aspect ratios by controlling the synthesis conditions. It thus appears as an interesting model system to investigate how aspect ratio and ionic valence influence the colloidal behavior of highly anisometric rods. EXPERIMENTS The nanotubes were synthesized by hydrothermal treatment for 5 or 20 days to modify the aspect ratio while the electrostatic interactions were investigated by comparing the colloidal stability in symmetric and asymmetric electrolytes. The phase behavior and their related microstructure were determined by optical observations and small-angle X-ray scattering measurements, coupled with interparticle distance modelling. FINDINGS We revealed that colloidal suspensions of Ge-DWINTs prepared in NaCl are guided by repulsive double layer forces, undergoing different liquid crystal phase transitions before stiffen into a glass-like state. We found that the microstructure can be rationalized by taking into account the anisometric nature of the particles. By contrast, dispersions prepared with asymmetric electrolytes are governed by strong attractive forces and thus form space-filling gels containing large nanotubes aggregates.
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Affiliation(s)
- Claire Hotton
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France.
| | - Léna Le Roux
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - Claire Goldmann
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - Stéphan Rouzière
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - Pascale Launois
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France
| | - Thomas Bizien
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Gif-sur-Yvette Cedex, France
| | - Erwan Paineau
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay 91405, France.
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Ananthasubramanian P, Sahay R, Raghavan N. Enhancement of the mechanical properties in ultra-low weight SWCNT sandwiched PDMS composites using a novel stacked architecture. Sci Rep 2024; 14:4487. [PMID: 38396000 PMCID: PMC10891152 DOI: 10.1038/s41598-024-54631-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Accepted: 02/14/2024] [Indexed: 02/25/2024] Open
Abstract
This study focuses on enhancing the mechanical properties of thin, soft, free-standing films via a layer-by-layer (LBL) fabrication process called LBL-FP. Soft polymer nanocomposite (PNC) thin films, combining polydimethylsiloxane (PDMS) and single-walled carbon nanotubes (SWCNT) at ultra-low loadings using a unique bottom-up LBL-FP, are examined. Two different structures of layered composites, (i) LBL PNCs- Layered composites with alternating layers of PDMS and SWCNT, (ii) Bulk PNCs- Layered composites with SWCNT dispersed in the bulk of PDMS, are comparatively investigated for their structural and mechanical properties. Silane-functionalized SWCNT strengthens the chemical bonding with PDMS, improving adhesion and dispersion. Mechanical analysis using nanoindentation, delamination, and dynamic analysis highlights the advantages of LBL PNCs with alternating layers of PDMS and SWCNT. Notably, LBL PNC (0.5 wt%) exhibits significant improvements, such as 2.6X increased nanoindentation resistance, 3X improved viscoelasticity, and (2-5)X enhanced tensile properties in comparison with neat PDMS. Due to this, LBL PNCs offer potential for soft, lightweight applications like wearables, electromagnetic interference shielding materials, and strain sensors while advancing composite thin film mechanics. The study emphasizes using a stacked architecture to produce PDMS-SWCNT multilayered PNCs with improved mechanics utilizing ultra-low concentrations of SWCNT. This first-of-its-kind stack design facilitates possibilities for lightweight composites utilizing less fillers. The LBL assembly involves the stacking of alternating layers of different materials, each contributing specific properties to enhance the overall strength and toughness of the structure.
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Affiliation(s)
- Pavithra Ananthasubramanian
- nano-Macro Reliability Laboratory (nMRL), Engineering Product Development (EPD) Pillar, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore
| | - Rahul Sahay
- nano-Macro Reliability Laboratory (nMRL), Engineering Product Development (EPD) Pillar, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore
| | - Nagarajan Raghavan
- nano-Macro Reliability Laboratory (nMRL), Engineering Product Development (EPD) Pillar, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.
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Ha HA, Al-Ansari MM, Al-Dahmash ND, Krishnan R, Shanmuganathan R. In vitro analyses of cerium oxide nanoparticles in degrading anthracene/fluorene and revealing the antibiofilm activity against bacteria and fungi. CHEMOSPHERE 2023; 345:140487. [PMID: 37875217 DOI: 10.1016/j.chemosphere.2023.140487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 10/13/2023] [Accepted: 10/17/2023] [Indexed: 10/26/2023]
Abstract
A sol-gel method was used to synthesize the cerium dioxide nanoparticles. The nanoparticles formed were then characterized with UV-visible spectrophotometry, Fourier Transform Infrared Spectrophotometer (FTIR), SEM-EDAX, XRD, and Dynamic Light Scattering (DLS). The UV-visible absorbance at 282 nm and characteristic peak at 600-4000 cm-1 provided insight into the formation of cerium dioxide nanoparticles using a chemical method. SEM analysis and EDAX analysis confirmed nanoparticle formation and elements within the nanoparticles based on their irregular morphology. The hydrodynamic size obtained from the DLS analysis was 178.4 nm and the polydispersity was 0.275 nm. Furthermore, XRD results confirmed the crystalline nature of cerium dioxide nanoparticles. Using batch adsorption as a method, the effect of concentration of Polycyclic Aromatic Hydrocarbons (PAH), adsorbent concentration, pH, and irradiation source was investigated. Under UV light conditions, 10 μg/mL cerium dioxide nanoparticle at pH 5 degraded 2 μg/mL of PAH (anthracene and fluorene). Consequently, the synthesized cerium dioxide nanoparticles were effective photocatalysts. For anthracene and fluorene, kinetic studies showed the degradation process followed pseudo-second-order kinetics and Freundlich isotherms. Cerium oxide also exhibited significant antimicrobial and antibiofilm activity against bacteria and fungi. As a result, the cerium dioxide nanoparticle has proved to be a highly effective photocatalytic tool for the degradation of PAHs and exhibits strong antimicrobial activity.
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Affiliation(s)
- Hai-Anh Ha
- Faculty of Pharmacy, Duy Tan University, Da Nang 550000, Viet Nam.
| | - Mysoon M Al-Ansari
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Nora Dahmash Al-Dahmash
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Ramakrishnan Krishnan
- Department of Business, Harrisburg University of Science and Technology, Harrisburg, PA 17101, USA
| | - Rajasree Shanmuganathan
- Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical And Technical Sciences (SIMATS), Saveetha University, Chennai 600 077, India.
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Gholami A, Mousavi SM, Masoumzadeh R, Binazadeh M, Bagheri Lankarani K, Omidifar N, Arjmand O, Chiang WH, Moghadami M, Pynadathu Rumjit N. Advanced Theranostic Strategies for Viral Hepatitis Using Carbon Nanostructures. MICROMACHINES 2023; 14:1185. [PMID: 37374770 DOI: 10.3390/mi14061185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/27/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023]
Abstract
There are several treatment protocols for acute viral hepatitis, and it is critical to recognize acute hepatitis in its earliest stages. Public health measures to control these infections also rely on rapid and accurate diagnosis. The diagnosis of viral hepatitis remains expensive, and there is no adequate public health infrastructure, while the virus is not well-controlled. New methods for screening and detecting viral hepatitis through nanotechnology are being developed. Nanotechnology significantly reduces the cost of screening. In this review, the potential of three-dimensional-nanostructured carbon substances as promising materials due to fewer side effects, and the contribution of these particles to effective tissue transfer in the treatment and diagnosis of hepatitis due to the importance of rapid diagnosis for successful treatment, were extensively investigated. In recent years, three-dimensional carbon nanomaterials such as graphene oxide and nanotubes with special chemical, electrical, and optical properties have been used for the diagnosis and treatment of hepatitis due to their high potential. We expect that the future position of nanoparticles in the rapid diagnosis and treatment of viral hepatitis can be better determined.
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Affiliation(s)
- Ahmad Gholami
- Biotechnology Research Center, Shiraz University of Medical Science, Shiraz 71439-14693, Iran
- Pharmaceutical Sciences Research Center, Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Shiraz University of Medical Science, Shiraz 71439-14693, Iran
| | - Seyyed Mojtaba Mousavi
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Reza Masoumzadeh
- Department of Medical, Shiraz University of Medical Sciences, Shiraz 71439-14693, Iran
| | - Mojtaba Binazadeh
- Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz 71557-13876, Iran
| | - Kamran Bagheri Lankarani
- Health Policy Research Center, Health Institute, Shiraz University of Medical Sciences, Shiraz 71439-14693, Iran
| | - Navid Omidifar
- Biotechnology Research Center, Shiraz University of Medical Science, Shiraz 71439-14693, Iran
- Department of Pathology, Shiraz University of Medical Sciences, Shiraz 71439-14693, Iran
| | - Omid Arjmand
- Department of Chemical Engineering, South Tehran Branch, Islamic Azad University, Tehran 14687-63785, Iran
| | - Wei-Hung Chiang
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Mohsen Moghadami
- Non-Communicable Diseases Research Center, Shiraz University of Medical Sciences, Shiraz 71439-14693, Iran
| | - Nelson Pynadathu Rumjit
- Nanotechnology and Catalysis Research Centre (NANOCAT), Level 3, Block A, Institute for Advanced Studies (IAS), University of Malaya (UM), Kuala Lumpur 50603, Malaysia
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Singh RP, Kaur T. HRMAS-NMR and simulation study of the self-assembly of surfactants on carbon nanotubes. Phys Chem Chem Phys 2023; 25:12900-12913. [PMID: 37165884 DOI: 10.1039/d2cp03762a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Polyethoxylated surfactants, such as those of the Tween and Pluronic series, are commonly used to disperse carbon nanotubes (CNTs) and other nanoparticles. However, the current understanding of the nature of interactions between these surfactants and CNTs is limited. The nature of the interactions between surfactants (Tween-80 [T80] and Pluronic F68 [PF68]) and CNTs was investigated using high-resolution magic angle spinning nuclear magnetic resonance (HRMAS-NMR) and coarse-grained molecular dynamics (MD) simulations. HRMAS-NMR revealed that T80 molecules interact with single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs) via the oleyl chain, whereas PF68 molecules interact with the surface of SWCNTs and MWCNTs via the polypropylene oxide residues. The polyethylene oxide chains were oriented towards the external aqueous environment. The HRMAS-NMR results were supported by MD simulations, and the latter provided further insights into the nature of the interactions.
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Affiliation(s)
- Raman Preet Singh
- Department of Pharmaceutical Sciences, Government Polytechnic College for Girls, Patiala, PB, 147 001, India.
| | - Taranpreet Kaur
- Department of Biotechnology, Government Mohindra College, Patiala, PB, 147 001, India
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Cho G, Grinenval E, Gabriel JCP, Lebental B. Intense pH Sensitivity Modulation in Carbon Nanotube-Based Field-Effect Transistor by Non-Covalent Polyfluorene Functionalization. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1157. [PMID: 37049251 PMCID: PMC10096590 DOI: 10.3390/nano13071157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/15/2023] [Accepted: 03/16/2023] [Indexed: 06/19/2023]
Abstract
We compare the pH sensing performance of non-functionalized carbon nanotubes (CNT) field-effect transistors (p-CNTFET) and CNTFET functionalized with a conjugated polyfluorene polymer (labeled FF-UR) bearing urea-based moieties (f-CNTFET). The devices are electrolyte-gated, PMMA-passivated, 5 µm-channel FETs with unsorted, inkjet-printed single-walled CNT. In phosphate (PBS) and borate (BBS) buffer solutions, the p-CNTFETs exhibit a p-type operation while f-CNTFETs exhibit p-type behavior in BBS and ambipolarity in PBS. The sensitivity to pH is evaluated by measuring the drain current at a gate and drain voltage of -0.8 V. In PBS, p-CNTFETs show a linear, reversible pH response between pH 3 and pH 9 with a sensitivity of 26 ± 2.2%/pH unit; while f-CNTFETs have a much stronger, reversible pH response (373%/pH unit), but only over the range of pH 7 to pH 9. In BBS, both p-CNTFET and f-CNTFET show a linear pH response between pH 5 and 9, with sensitivities of 56%/pH and 96%/pH, respectively. Analysis of the I-V curves as a function of pH suggests that the increased pH sensitivity of f-CNTFET is consistent with interactions of FF-UR with phosphate ions in PBS and boric acid in BBS, with the ratio and charge of the complexed species depending on pH. The complexation affects the efficiency of electrolyte gating and the surface charge around the CNT, both of which modify the I-V response of the CNTFET, leading to the observed current sensitivity as a function of pH. The performances of p-CNTFET in PBS are comparable to the best results in the literature, while the performances of the f-CNTFET far exceed the current state-of-the-art by a factor of four in BBS and more than 10 over a limited range of pH in BBS. This is the first time that a functionalization other than carboxylate moieties has significantly improved the state-of-the-art of pH sensing with CNTFET or CNT chemistors. On the other hand, this study also highlights the challenge of transferring this performance to a real water matrix, where many different species may compete for interactions with FF-UR.
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Affiliation(s)
- Gookbin Cho
- Laboratoire de Physique des Interfaces et des Couches Minces, LPICM, CNRS, Ecole Polytechnique, Institut Polytechnique Paris, 91128 Palaiseau, France
| | - Eva Grinenval
- Laboratoire de Physique des Interfaces et des Couches Minces, LPICM, CNRS, Ecole Polytechnique, Institut Polytechnique Paris, 91128 Palaiseau, France
| | | | - Bérengère Lebental
- IMSE, COSYS, Université Gustave Eiffel, Marne-la-Vallée Campus, 77447 Marne-La-Vallée, France
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8
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Surface-Treated Carbon Black for Durable, Efficient, Continuous Flow Electrode Capacitive Deionization. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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9
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Qasim M, Clarkson AN, Hinkley SFR. Green Synthesis of Carbon Nanoparticles (CNPs) from Biomass for Biomedical Applications. Int J Mol Sci 2023; 24:ijms24021023. [PMID: 36674532 PMCID: PMC9863453 DOI: 10.3390/ijms24021023] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/19/2022] [Accepted: 12/21/2022] [Indexed: 01/07/2023] Open
Abstract
In this review, we summarize recent work on the "green synthesis" of carbon nanoparticles (CNPs) and their application with a focus on biomedical applications. Recent developments in the green synthesis of carbon nanoparticles, from renewable precursors and their application for environmental, energy-storage and medicinal applications are discussed. CNPs, especially carbon nanotubes (CNTs), carbon quantum dots (CQDs) and graphene, have demonstrated utility as high-density energy storage media, environmental remediation materials and in biomedical applications. Conventional fabrication of CNPs can entail the use of toxic catalysts; therefore, we discuss low-toxicity manufacturing as well as sustainable and environmentally friendly methodology with a focus on utilizing readily available biomass as the precursor for generating CNPs.
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Affiliation(s)
- Muhammad Qasim
- Department of Anatomy, Brain Health Research Centre and Brain Research New Zealand, University of Otago, Dunedin 9054, New Zealand
| | - Andrew N. Clarkson
- Department of Anatomy, Brain Health Research Centre and Brain Research New Zealand, University of Otago, Dunedin 9054, New Zealand
- Correspondence: (A.N.C.); (S.F.R.H.); Tel.: +64-3-279-7326 (A.N.C.); +64-4-463-0052 (S.F.R.H)
| | - Simon F. R. Hinkley
- Ferrier Research Institute, Victoria University of Wellington, Wellington 5012, New Zealand
- Correspondence: (A.N.C.); (S.F.R.H.); Tel.: +64-3-279-7326 (A.N.C.); +64-4-463-0052 (S.F.R.H)
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El Rifaii K, Wensink HH, Dozov I, Bizien T, Michot LJ, Gabriel JCP, Breu J, Davidson P. Do Aqueous Suspensions of Smectite Clays Form a Smectic Liquid-Crystalline Phase? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14563-14573. [PMID: 36395196 DOI: 10.1021/acs.langmuir.2c01821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Bottom-up strategies for the production of well-defined nanostructures often rely on the self-assembly of anisotropic colloidal particles (nanowires and nanosheets). These building blocks can be obtained by delamination in a solvent of low-dimensionality crystallites. To optimize particle availability, determination of the delamination mechanism and the different organization stages of anisotropic particles in dispersion is essential. We address this fundamental issue by exploiting a recently developed system of fluorohectorite smectite clay mineral that delaminates in water, leading to colloidal dispersions of single-layer, very large (≈20 μm) clay sheets at high dilution. We show that when the clay crystallites are dispersed in water, they swell to form periodic one-dimensional stacks of fluorohectorite sheets with very low volume fraction (<1%) and therefore huge (≈100 nm) periods. Using optical microscopy and synchrotron X-ray scattering, we establish that these colloidal stacks bear strong similarities, yet subtle differences, with a smectic liquid-crystalline phase. Despite the high dilution, the colloidal stacks of sheets, called colloidal accordions, are extremely robust mechanically and can persist for years. Moreover, when subjected to AC electric fields, they rotate as solid bodies, which demonstrates their outstanding internal cohesion. Furthermore, our theoretical model captures the dependence of the stacking period on the dispersion concentration and ionic strength and explains, invoking the Donnan effect, why the colloidal accordions are kinetically stable over years and impervious to shear and Brownian motion. Because our model is not system specific, we expect that similar colloidal accordions frequently appear as an intermediate state during the delamination process of two-dimensional crystals in polar solvents.
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Affiliation(s)
- Karin El Rifaii
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405Orsay, France
| | - Henricus H Wensink
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405Orsay, France
| | - Ivan Dozov
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405Orsay, France
| | - Thomas Bizien
- SWING Beamline, SOLEIL Synchrotron, 91192Gif-sur-Yvette, France
| | - Laurent J Michot
- Laboratory of Physical Chemistry of Electrolytes and Interfacial Nanosystems (PHENIX), Sorbonne Université, CNRS, 75005Paris, France
| | | | - Josef Breu
- Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstrasse 30, 95440Bayreuth, Germany
| | - Patrick Davidson
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, 91405Orsay, France
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Bisht A, Zuñiga-Bustos M, Prasher G, Gautam S, Poblete H, Singh RP. Stabilization of Carbon Nanotubes and Graphene by Tween-80: Mechanistic Insights from Spectroscopic and Simulation Studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10173-10182. [PMID: 35947770 DOI: 10.1021/acs.langmuir.2c01190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Polyoxyethylene sorbitan monooleate is commonly used to obtain stable dispersions of nanoparticles (NPs) such as carbon nanotubes (CNTs) and graphene. However, the mechanism underlying dispersion is poorly understood. The present study aimed at investigating the mechanism of stabilization of carbon NPs (CNPs), namely, single-walled CNTs (SWCNTs), multi-walled CNTs (MWCNTs), and graphene, by Tween-80 using attenuated total internal reflection-Fourier transform infrared and nuclear magnetic resonance (NMR) spectroscopy. Molecular dynamics (MD) simulations were performed to identify, at the atomic scale, the significant interactions that underlie the adsorption and the stabilizing effect of Tween-80 on CNPs, in this way corroborating the spectroscopy results. Spectroscopic analysis revealed that the alkyl chain tether to SWCNT, MWCNT, and graphene surface, presumably through π-π interactions between the carbon-carbon double bond in the alkyl chain and the aromatic rings of CNPs. The hydrophilic polyethoxylate chains extend into the aqueous environment and stabilize the suspension by steric hindrance. MD simulations also showed that Tween-80 molecules interact with the CNP surface via the alkyl chain, thus corroborating spectroscopy results. MD simulations additionally revealed that Tween-80 aggregates on the CNP surface shifted from planar to micelle-like with increasing Tween-80 ratios, underscoring concentration-dependent changes in the nature of these interactions.
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Affiliation(s)
- Alpna Bisht
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Matías Zuñiga-Bustos
- Programa Institucional de Fomento a la Investigación, Desarrollo e Innovación (PIDi), Universidad Tecnológica Metropolitana, Santiago 8940577, Chile
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, 2 Norte 685, Talca 3465548, Chile
| | - Garima Prasher
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Surbhi Gautam
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
| | - Horacio Poblete
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, 2 Norte 685, Talca 3465548, Chile
- Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Talca 3465548, Chile
| | - Raman Preet Singh
- School of Pharmaceutical Sciences, Shoolini University, Solan, Himachal Pradesh 173 229, India
- Department of Pharmacy, Government Polytechnic College, Bathinda, Punjab 151 001, India
- Department of Pharmaceutical Sciences, Government Polytechnic College for Girls, Patiala, Punjab 147 001, India
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Carbon nanotube as an emerging theranostic tool for oncology. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mesguich D, Moumaneix L, Henri V, Legnani M, Collière V, Esvan J, Ouali A, Fau P. Grafting Copper Atoms and Nanoparticles on Double-Walled Carbon Nanotubes: Application to Catalytic Synthesis of Propargylamine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:8545-8554. [PMID: 35793138 DOI: 10.1021/acs.langmuir.2c00771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The decoration of carbon nanotubes (CNTs) by metal nanoparticles (NPs) combines the advantages of a high specific surface material with catalytic properties of metal nanocrystals. Little work has been devoted to the decoration of CNTs with copper NPs, and no evidence of copper atomic decoration of CNTs has shown up until now. Herein, we demonstrate that the strong acidic oxidation of double-walled CNTs (dwCNTs) is very efficient for the decoration of the carbon surface by copper NPs and atoms. This treatment severely degraded the CNT walls and generated a large amount of disordered sp3 carbon. This amorphous carbon film bears many chemically active functions like carboxyl and hydroxyl ones. In such conditions, the CNT walls behave as very efficient ligands for the stabilization of copper obtained by the thermolysis of the mesityl precursor in organic solution under mild dihydrogen pressure. In addition to copper NPs, we evidenced the presence of a regular coverage with copper atoms over the dwCNTs. This nanocomposite catalyzes the quantitative synthesis of propargylamines via one A3-type coupling reaction. Five consecutive catalytic cycles with 100% yield could be performed with no loss of activity, and the combination of Cu supported on dwCNTs allows a facile recycling of the catalytic material.
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Affiliation(s)
- David Mesguich
- CIRIMAT, Université de Toulouse, CNRS-INPT-UPS, Université de Toulouse 3 Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - Lilian Moumaneix
- CIRIMAT, Université de Toulouse, CNRS-INPT-UPS, Université de Toulouse 3 Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
- LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France
| | - Victor Henri
- CIRIMAT, Université de Toulouse, CNRS-INPT-UPS, Université de Toulouse 3 Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
- LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France
| | - Morgan Legnani
- CIRIMAT, Université de Toulouse, CNRS-INPT-UPS, Université de Toulouse 3 Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
- LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France
| | - Vincent Collière
- LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UT 3 Paul-Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
| | - Jérôme Esvan
- CIRIMAT, Université de Toulouse, CNRS-INPT-UPS, 4 Allée Emile Monso, BP 44362, 31030 Toulouse, France
| | - Armelle Ouali
- Institut Charles Gerhardt, UMR5253 Ecole Nationale Supérieure de Chimie de Montpellier, 8 Rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Pierre Fau
- LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UT 3 Paul-Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 9, France
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Fritea L, Banica F, Costea TO, Moldovan L, Dobjanschi L, Muresan M, Cavalu S. Metal Nanoparticles and Carbon-Based Nanomaterials for Improved Performances of Electrochemical (Bio)Sensors with Biomedical Applications. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6319. [PMID: 34771844 PMCID: PMC8585379 DOI: 10.3390/ma14216319] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/15/2021] [Accepted: 10/20/2021] [Indexed: 12/30/2022]
Abstract
Monitoring human health for early detection of disease conditions or health disorders is of major clinical importance for maintaining a healthy life. Sensors are small devices employed for qualitative and quantitative determination of various analytes by monitoring their properties using a certain transduction method. A "real-time" biosensor includes a biological recognition receptor (such as an antibody, enzyme, nucleic acid or whole cell) and a transducer to convert the biological binding event to a detectable signal, which is read out indicating both the presence and concentration of the analyte molecule. A wide range of specific analytes with biomedical significance at ultralow concentration can be sensitively detected. In nano(bio)sensors, nanoparticles (NPs) are incorporated into the (bio)sensor design by attachment to the suitably modified platforms. For this purpose, metal nanoparticles have many advantageous properties making them useful in the transducer component of the (bio)sensors. Gold, silver and platinum NPs have been the most popular ones, each form of these metallic NPs exhibiting special surface and interface features, which significantly improve the biocompatibility and transduction of the (bio)sensor compared to the same process in the absence of these NPs. This comprehensive review is focused on the main types of NPs used for electrochemical (bio)sensors design, especially screen-printed electrodes, with their specific medical application due to their improved analytical performances and miniaturized form. Other advantages such as supporting real-time decision and rapid manipulation are pointed out. A special attention is paid to carbon-based nanomaterials (especially carbon nanotubes and graphene), used by themselves or decorated with metal nanoparticles, with excellent features such as high surface area, excellent conductivity, effective catalytic properties and biocompatibility, which confer to these hybrid nanocomposites a wide biomedical applicability.
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Affiliation(s)
- Luminita Fritea
- Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 Decembrie, 410087 Oradea, Romania; (L.F.); (F.B.); (M.M.); (S.C.)
| | - Florin Banica
- Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 Decembrie, 410087 Oradea, Romania; (L.F.); (F.B.); (M.M.); (S.C.)
| | - Traian Octavian Costea
- Advanced Materials Research Infrastructure—SMARTMAT, University of Oradea, 1 Universitatii Street, 410087 Oradea, Romania;
| | - Liviu Moldovan
- Faculty of Electrical Engineering and Information Technology, University of Oradea, 1 Universitatii Street, 410087 Oradea, Romania
| | - Luciana Dobjanschi
- Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 Decembrie, 410087 Oradea, Romania; (L.F.); (F.B.); (M.M.); (S.C.)
| | - Mariana Muresan
- Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 Decembrie, 410087 Oradea, Romania; (L.F.); (F.B.); (M.M.); (S.C.)
| | - Simona Cavalu
- Faculty of Medicine and Pharmacy, University of Oradea, 10 P-ta 1 Decembrie, 410087 Oradea, Romania; (L.F.); (F.B.); (M.M.); (S.C.)
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Ngo QP, He M, Concellón A, Yoshinaga K, Luo SXL, Aljabri N, Swager TM. Reconfigurable Pickering Emulsions with Functionalized Carbon Nanotubes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8204-8211. [PMID: 34190561 DOI: 10.1021/acs.langmuir.1c00904] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Pickering emulsions (PEs) achieve interfacial stabilization by colloidal particle surfactants and are commonly used in food, cosmetics, and pharmaceuticals. Carbon nanotubes (CNTs) have recently been used as stabilizing materials to create dynamic single emulsions. In this study, we used the formation of Meisenheimer complexes on functionalized CNTs to fabricate complex biphasic emulsions containing hydrocarbons (HCs) and fluorocarbons (FCs). The reversible nature of Meisenheimer complex formation allows for further functionalization at the droplet-water interface. The strong affinity of fluorofluorescent perylene bisimide (F-PBI) to the CNTs was used to enhance the assembly of CNTs on the FC-water interface. The combination of different concentrations of the functionalized CNTs and the pelene additive enables predictable complex emulsion morphologies. Reversible morphology reconfiguration was explored with the addition of molecular surfactants. Our results show that the interfacial properties of functionalized CNTs have considerable utility in the fabrication of complex dynamic emulsions.
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Affiliation(s)
- Quynh P Ngo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Maggie He
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Alberto Concellón
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Kosuke Yoshinaga
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shao-Xiong Lennon Luo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Nouf Aljabri
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Exploration Advanced Research Center (EXPEC ARC), Saudi Aramco, Dhahran 31311, Saudi Arabia
| | - Timothy M Swager
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Mustafiz MB, Maria KH, Rahman MJ, Mieno T. Bio-composites from banana tree fibers ambient with multi-walled carbon nanotubes: manufacturing and properties. INTERNATIONAL NANO LETTERS 2021. [DOI: 10.1007/s40089-021-00331-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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Synthesis of a new polyurethane-based liner modified by carbon nanotube to prevent plasticizer migration. Polym Bull (Berl) 2021. [DOI: 10.1007/s00289-021-03648-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gomes WE, Beatto TG, Marcatto LC, Matsubara EY, Mendes RK, Rosolen JM. Electrochemical Determination of Hydroquinone Using a Tyrosinase-Based Cup-Stacked Carbon Nanotube (CSCNT)/Carbon Fiber Felt Composite Electrode. ANAL LETT 2021. [DOI: 10.1080/00032719.2021.1884256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Wyllerson Evaristo Gomes
- CEATEC, R. Prof. Dr. Euryclides de Jesus Zerbini, Pontifícia Universidade Católica de Campinas (PUC-CAMPINAS), Campinas, Brazil
| | - Thainá Godoy Beatto
- CEATEC, R. Prof. Dr. Euryclides de Jesus Zerbini, Pontifícia Universidade Católica de Campinas (PUC-CAMPINAS), Campinas, Brazil
| | - Lara Cristina Marcatto
- CEATEC, R. Prof. Dr. Euryclides de Jesus Zerbini, Pontifícia Universidade Católica de Campinas (PUC-CAMPINAS), Campinas, Brazil
| | - Elaine Yoshiko Matsubara
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto , Brazil
| | - Renata Kelly Mendes
- CEATEC, R. Prof. Dr. Euryclides de Jesus Zerbini, Pontifícia Universidade Católica de Campinas (PUC-CAMPINAS), Campinas, Brazil
| | - José Maurício Rosolen
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto , Brazil
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Study of the mechanism of influence of carbon nanotubes surface chemistry on the mechanical properties of fiberglass. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01448-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bhattacharjee S, Brayden DJ. Addressing the challenges to increase the efficiency of translating nanomedicine formulations to patients. Expert Opin Drug Discov 2020; 16:235-254. [PMID: 33108229 DOI: 10.1080/17460441.2021.1826434] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Nanotechnology is in a growth phase for drug delivery and medical imaging. Nanomaterials with unique properties present opportunities for encapsulation of therapeutics and imaging agents, along with conjugation to ligands for targeting. Favorable chemistry of nanomaterials can create formulations that address critical challenges for therapeutics, such as insolubility and a low capacity to cross the blood-brain-barrier (BBB) and intestinal wall. AREAS COVERED The authors investigate challenges faced during translation of nanomedicines while suggesting reasons as to why some nanoformulations have under-performed in clinical trials. They assess physiological barriers such as the BBB and gut mucus that nanomedicines must overcome to deliver cargos. They also provide an overview with examples of how nanomedicines can be designed to improve localization and site-specific delivery (e.g., encapsulation, bioconjugation, and triggered-release). EXPERT OPINION There are examples where nanomedicines have demonstrated improved efficacy of payload in humans; however, most of the advantages conferred were in improved pharmacokinetics and reduced toxicity. Problematic data show susceptibility of nanoformulations against natural protective mechanisms present in the body, including distribution impediment by physiological barriers and activation of the reticuloendothelial system. Further initiatives should address current challenges while expanding the scope of nanomedicine into advanced biomedical imaging and antibiotic delivery.
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Affiliation(s)
- Sourav Bhattacharjee
- School of Veterinary Medicine, University College Dublin (UCD), Belfield, Dublin, Ireland
| | - David J Brayden
- School of Veterinary Medicine, University College Dublin (UCD), Belfield, Dublin, Ireland.,Conway Institute of Biomolecular and Biomedical Research, University College Dublin (UCD), Belfield, Dublin, Ireland
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Qazi RA, Khan MS, Shah LA, Ullah R, Kausar A, Khattak R. Eco-friendly electronics, based on nanocomposites of biopolyester reinforced with carbon nanotubes: a review. POLYM-PLAST TECH MAT 2020. [DOI: 10.1080/25740881.2020.1719137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Raina Aman Qazi
- Polymer Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
| | - Mohammad Saleem Khan
- Polymer Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - Luqman Ali Shah
- Polymer Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - Rizwan Ullah
- Polymer Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - Ayesha Kausar
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
- National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
| | - Rozina Khattak
- Department of Chemistry, Shaheed Benazir Bhutto Women University, Peshawar, Pakistan
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Kuznetsov V. Stereochemistry of Simple Molecules inside Nanotubes and Fullerenes: Unusual Behavior of Usual Systems. Molecules 2020; 25:molecules25102437. [PMID: 32456128 PMCID: PMC7287839 DOI: 10.3390/molecules25102437] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 05/19/2020] [Accepted: 05/21/2020] [Indexed: 12/13/2022] Open
Abstract
Over the past three decades, carbon nanotubes and fullerenes have become remarkable objects for starting the implementation of new models and technologies in different branches of science. To a great extent, this is defined by the unique electronic and spatial properties of nanocavities due to the ramified π-electron systems. This provides an opportunity for the formation of endohedral complexes containing non-covalently bonded atoms or molecules inside fullerenes and nanotubes. The guest species are exposed to the force field of the nanocavity, which can be described as a combination of electronic and steric requirements. Its action significantly changes conformational properties of even relatively simple molecules, including ethane and its analogs, as well as compounds with C-O, C-S, B-B, B-O, B-N, N-N, Al-Al, Si-Si and Ge-Ge bonds. Besides that, the cavity of the host molecule dramatically alters the stereochemical characteristics of cyclic and heterocyclic systems, affects the energy of pyramidal nitrogen inversion in amines, changes the relative stability of cis and trans isomers and, in the case of chiral nanotubes, strongly influences the properties of R- and S- enantiomers. The present review aims at primary compilation of such unusual stereochemical effects and initial evaluation of the nature of the force field inside nanotubes and fullerenes.
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Affiliation(s)
- Valerij Kuznetsov
- Ufa State Aviation Technical University, K. Marksa, 12, Ufa 450008, Russia;
- Ufa State Petroleum Technological University, Kosmonavtov, 1, Ufa 450062, Russia
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Multi-walled carbon nanotubes improved growth, anatomy, physiology, secondary metabolism, and callus performance in Catharanthus roseus: an in vitro study. 3 Biotech 2019; 9:404. [PMID: 31681525 DOI: 10.1007/s13205-019-1934-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/09/2019] [Indexed: 01/20/2023] Open
Abstract
This study was conducted to monitor the physiological and molecular responses of Catharanthus roseus (rose periwinkle) to multi-walled carbon nanotube (MWCNT) incorporation into the culture medium. The seeds were grown on hormone-free MS medium supplemented with 0, 50, 100, and 150 mgL-1of MWCNT. The supplementations of culture medium with MWCNTs led to significant increases in plant growth indexes such as leaf width, leaf area, leaf fresh weight, root length, and total plant biomass). Slight increases were also observed in chlorophyll a (Chla), Chlb, and carotenoid contents (mean = 18.6%) in MWCNT-treated seedlings. Protein concentrations increased by an average of 34% relative to the control. The application of MWCNT resulted in twofold increases in the catalase and peroxidase activities. A similar trend was also observed in the phenylalanine ammonia lyase activities (by an average of 36.5%), soluble phenols (by 23%), and alkaloids (by 1.7-fold). Moreover, upregulations (mean = 37-fold) in the transcriptions of the DAT gene resulted from the MWCNT supplementations. Exposure to MWCNT improved cell sizes and xylem conducting tissue in treated seedlings. The applications of MWCNTs also stimulated the callus initiation and performance, implying their effects on proliferation and possible differentiation. This study has provided evidence of role MWCNT play in improving plant performance and production of pharmaceutical secondary metabolites.
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