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Azmayesh R, Naghshara H, Mohammadi Aref S, Ghafouri M. Preparation of a polyaniline/ZnO-NPs composite for the visible-light-driven hydrogen generation. Sci Rep 2024; 14:3165. [PMID: 38326373 PMCID: PMC10850164 DOI: 10.1038/s41598-024-53672-2] [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: 11/19/2023] [Accepted: 02/03/2024] [Indexed: 02/09/2024] Open
Abstract
Compositions of ZnO nanoparticles and polyaniline, in the form of emeraldine salt, were manufactured as thin layers by using the spin-coating method. Then, the effect of polyaniline content on their photoelectrochemical characteristics was studied. Results indicate that all the samples are sensitive to light. Besides, with 0.30% of PANI, the composite sample demonstrates the highest photocurrent density; also, its photocurrent increment starts to increase at a voltage of ⁓ 1.23 V (vs. RHE), which is approximately in accordance with the theoretical potential of water electrolysis. Furthermore, since the rate of electron-hole recombination in this composite sample is the lowest, it possesses the highest photoelectrochemical efficiency. Main findings were analyzed with respect to UV-visible absorption and photoluminescence spectra as well as SEM micrographs of the samples and Raman spectral measurements. Besides, electrochemical impedance spectroscopy analysis was applied to both pure ZnO and the sample with the best response. Effects of drying temperature and layer thickness were also investigated.
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Affiliation(s)
| | - Hamid Naghshara
- Faculty of Physics, University of Tabriz, Tabriz, Iran.
- Research Institute of Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran.
| | - Sajedeh Mohammadi Aref
- Faculty of Physics, University of Tabriz, Tabriz, Iran
- Research Institute of Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran
| | - Mohammad Ghafouri
- Physics Department, Islamic Azad University, Shabestar Branch, Shabestar, Iran
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2
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Eckstein BJ, Martin HR, Moghadasnia MP, Halder A, Melville MJ, Buzinski TN, Balaich GJ, McGuirk CM. Influence of donor point modifications on the assembly of chalcogen-bonded organic frameworks. Chem Commun (Camb) 2024; 60:758-761. [PMID: 38126447 DOI: 10.1039/d3cc05162e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Incremental, single-atom substitutions of Se-based chalcogen bond (Ch-bond) donors with stronger donating Te centers were implemented in two new triptycene tris(1,2,5-chalcogenadiazole) tectons. The appreciably more favorable Ch-bonding ability of the Te-based donors promotes assembly of low-density networks and more stable Ch-bonded organic frameworks (ChOFs).
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Affiliation(s)
- Brian J Eckstein
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
| | - Hannah R Martin
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
| | | | - Arijit Halder
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
| | - Michael J Melville
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
| | - Tara N Buzinski
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
| | - Gary J Balaich
- Department of Chemistry & Chemistry Research Center, Laboratories for Advanced Materials, United States Airforce Academy, Colorado Springs, Colorado, 80840, USA
| | - C Michael McGuirk
- Department of Chemistry, Colorado School of Mines, Golden, Colorado, 80401, USA.
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Lertsuphotvanit N, Tuntarawongsa S, Jitrangsri K, Phaechamud T. Clotrimazole-Loaded Borneol-Based In Situ Forming Gel as Oral Sprays for Oropharyngeal Candidiasis Therapy. Gels 2023; 9:gels9050412. [PMID: 37233003 DOI: 10.3390/gels9050412] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/12/2023] [Accepted: 05/13/2023] [Indexed: 05/27/2023] Open
Abstract
Oral candidiasis encompasses fungal infections of the tongue and other oral mucosal sites with fungal overgrowth and its invasion of superficial oral tissues. Borneol was assessed in this research as the matrix-forming agent of clotrimazole-loaded in situ forming gel (ISG) comprising clove oil as the co-active agent and N-methyl pyrrolidone (NMP) as a solvent. Their physicochemical properties, including pH, density, viscosity, surface tension, contact angle, water tolerance, gel formation, and drug release/permeation, were determined. Their antimicrobial activities were tested using agar cup diffusion. The pH values of clotrimazole-loaded borneol-based ISGs were in the range of 5.59-6.61, which are close to the pH of 6.8 of saliva. Increasing the borneol content in the formulation slightly decreased the density, surface tension, water tolerance, and spray angle but increased the viscosity and gel formation. The borneol matrix formation from NMP removal promoted a significantly (p < 0.05) higher contact angle of the borneol-loaded ISGs on agarose gel and porcine buccal mucosa than those of all borneol-free solutions. Clotrimazole-loaded ISG containing 40% borneol demonstrated appropriate physicochemical properties and rapid gel formation at microscopic and macroscopic levels. In addition, it prolonged drug release with a maximum flux of 370 µg·cm-2 at 2 days. The borneol matrix generated from this ISG obsentively controlled the drug penetration through the porcine buccal membrane. Most clotrimazole amounts still remained in formulation at the donor part and then the buccal membrane and receiving medium, repectively. Therefore, the borneol matrix extended the drug release and penetration through the buccal membrane efficiently. Some accumulated clotrimazole in tissue should exhibit its potential antifugal activity against microbes invading the host tissue. The other predominant drug release into the saliva of the oral cavity should influence the pathogen of oropharyngeal candidiasis. Clotrimazole-loaded ISG demonstrated efficacious inhibition of growth against S. aureus, E. coli, C. albicans, C. krusei, C. Lusitaniae, and C. tropicalis. Consequently, the clotrimazole-loaded ISG exhibited great potential as a drug delivery system for oropharyngeal candidiasis treatment by localized spraying.
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Affiliation(s)
- Nutdanai Lertsuphotvanit
- Program of Pharmaceutical Technology, Department of Industrial Pharmacy, Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
| | - Sarun Tuntarawongsa
- Pharmaceutical Intellectual Center "Prachote Plengwittaya", Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
- Natural Bioactive and Material for Health Promotion and Drug Delivery System Group (NBM), Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
| | - Kritamorn Jitrangsri
- Department of Chemical Engineering and Pharmaceutical Chemistry, School of Engineering and Technology, Walailak University, Nakhon Srithammarat 80160, Thailand
| | - Thawatchai Phaechamud
- Program of Pharmaceutical Technology, Department of Industrial Pharmacy, Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
- Natural Bioactive and Material for Health Promotion and Drug Delivery System Group (NBM), Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
- Department of Industrial Pharmacy, Faculty of Pharmacy, Silpakorn University, Nakhon Pathom 73000, Thailand
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Ivanišević I, Kovačić M, Zubak M, Ressler A, Krivačić S, Katančić Z, Gudan Pavlović I, Kassal P. Amphiphilic Silver Nanoparticles for Inkjet-Printable Conductive Inks. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12234252. [PMID: 36500875 PMCID: PMC9739383 DOI: 10.3390/nano12234252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/25/2022] [Accepted: 11/26/2022] [Indexed: 05/14/2023]
Abstract
The large-scale manufacturing of flexible electronics is nowadays based on inkjet printing technology using specially formulated conductive inks, but achieving adequate wetting of different surfaces remains a challenge. In this work, the development of a silver nanoparticle-based functional ink for printing on flexible paper and plastic substrates is demonstrated. Amphiphilic silver nanoparticles with narrow particle size distribution and good dispersibility were prepared via a two-step wet chemical synthesis procedure. First, silver nanoparticles capped with poly(acrylic acid) were prepared, followed by an amidation reaction with 3-morpholynopropylamine (MPA) to increase their lipophilicity. Density functional theory (DFT) calculations were performed to study the interactions between the particles and the dispersion medium in detail. The amphiphilic nanoparticles were dispersed in solvents of different polarity and their physicochemical and rheological properties were determined. A stable ink containing 10 wt% amphiphilic silver nanoparticles was formulated and inkjet-printed on different surfaces, followed by intense pulsed light (IPL) sintering. Low sheet resistances of 3.85 Ω sq-1, 0.57 Ω sq-1 and 19.7 Ω sq-1 were obtained for the paper, coated poly(ethylene terephthalate) (PET) and uncoated polyimide (PI) flexible substrates, respectively. Application of the nanoparticle ink for printed electronics was demonstrated via a simple flexible LED circuit.
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Affiliation(s)
- Irena Ivanišević
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Marin Kovačić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Marko Zubak
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Antonia Ressler
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
- Faculty of Engineering and Natural Sciences, Tampere University, Korkeakoulunkatu 6, P.O. Box 589, 33014 Tampere, Finland
| | - Sara Krivačić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Zvonimir Katančić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Iva Gudan Pavlović
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Petar Kassal
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
- Correspondence:
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Fayaz-Torshizi M, Graham EJ, Adjiman CS, Galindo A, Jackson G, Müller EA. SAFT- γ Force Field for the Simulation of Molecular Fluids 9: Coarse-Grained Models for Polyaromatic Hydrocarbons Describing Thermodynamic, Interfacial, Structural, and Transport Properties. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Drozdov A.D, Christiansen JD. Reentrant-Convex Swelling of Thermoresponsive Gels in Mixtures of Solvents. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A .D. Drozdov
- Department of Materials and Production, Aalborg University, Fibigerstraede 16, Aalborg 9220, Denmark
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Mirdamadi Esfahani M, Goerlitzer ESA, Kunz U, Vogel N, Engstler J, Andrieu-Brunsen A. N-Methyl-2-pyrrolidone as a Reaction Medium for Gold(III)-Ion Reduction and Star-like Gold Nanostructure Formation. ACS OMEGA 2022; 7:9484-9495. [PMID: 35350339 PMCID: PMC8945176 DOI: 10.1021/acsomega.1c06835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 02/18/2022] [Indexed: 06/14/2023]
Abstract
The efficiency of a wet chemical route to synthesize gold nanostructures with tunable size and shape significantly depends on the applied solvent and the interaction of solvent molecules with other species such as gold ions. The ability of the organic solvent N-methyl-2-pyrrolidone (NMP) as a suitable medium for application in star-like gold nanostructure (AuNS) synthesis with a tunable morphology at ambient conditions has been investigated. The time-dependent analysis of the UV-vis absorption spectra of AuIIICl4 - in a pure NMP solution illustrates the role of NMP as simultaneous complexing and reducing agents. Kinetic studies indicate that AuIIICl4 - in NMP solution is reduced to AuICl2 -, with no need to use another reducing agent, any external energy sources, or solvent pretreatment. This is because AuI species stay stable in this solution unless poly(vinylpyrrolidone) (PVP) catalyzes their disproportionation. Morphological studies by transmission electron microscopy (TEM) specify the high-yield synthesis of AuNS with monocrystalline spikes in a concentrated NMP solution by PVP. This study illustrates that the presence of seeds, as another agent to catalyze the disproportionation of AuI species, makes it possible to synthesize AuNS in varying concentrations of PVP in this medium. The role of PVP concentration and the presence of seeds in the formation kinetics, morphology, and optical properties is systematically discussed. The results achieved through this study develop a straightforward and safe procedure for AuNS synthesis in high yield in a water-miscible organic polar solvent with tunable morphology and optical properties. Considering the high capability of NMP to dissolve various types of polymers and hydrophobic ligands, synthesizing AuNS in this solvent opens a window to a practical and easy way to fabricate gold-based nanomaterials with fascinating optical properties.
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Affiliation(s)
- Maleknaz Mirdamadi Esfahani
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Eric Sidney Aaron Goerlitzer
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany
| | - Ulrike Kunz
- Department
of Materials and Earth Sciences, Physical
Metallurgy Group, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
| | - Nicolas Vogel
- Institute
of Particle Technology, Friedrich-Alexander
University Erlangen-Nürnberg, Cauerstraße 4, D-91058 Erlangen, Germany
| | - Joerg Engstler
- Eduard-Zintl-Institut
für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
| | - Annette Andrieu-Brunsen
- Ernst-Berl
Institut für Technische und Makromolekulare Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany
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The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02500-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
AbstractCarbon dioxide (CO2) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO2. In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO2 permeance and CO2/nitrogen (N2) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO2/N2 gas separation.
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Karnes JJ, Benjamin I. Deconstructing the Local Intermolecular Ordering and Dynamics of Liquid Chloroform and Bromoform. J Phys Chem B 2021; 125:3629-3637. [PMID: 33792320 DOI: 10.1021/acs.jpcb.0c10407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Local intermolecular structure and dynamics of the polar molecular liquids chloroform and bromoform are studied by molecular dynamics simulation. Structural distribution functions, including 1- and 2-D pair correlations and dipole contour plots allow direct comparison and show agreement with recent analyses of diffraction experiments. Studies of the haloforms' reorientational dynamics and longevity of structural features resulting from intermolecular interaction extend previous work toward deeper understanding of the factors controlling these features. Analyses of ensemble average structures and dynamical properties isolate mass, electrostatics, and steric packing as driving forces or contributing factors for the observed ordering and dynamics.
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Affiliation(s)
- John J Karnes
- Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Ilan Benjamin
- Department of Chemistry and Biochemistry, University of California-Santa Cruz, Santa Cruz, California 95064, United States
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10
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Non-covalent interactions of imidazolium-based ionic liquids with model pyrrolidones revealed by FTIR spectroscopy and quantum chemical model calculations. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Tagawa A, Shikata T. Anti-parallel dimer and tetramer formation of cyclic and open structure tertiary amides, N-methyl-2-pyrrolidone and N,N-dimethylacetamide, in solution of a non-polar solvent, benzene. Phys Chem Chem Phys 2019; 21:22081-22091. [PMID: 31565705 DOI: 10.1039/c9cp02500f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We examined the dielectric (DE) and nuclear magnetic resonance (NMR) spectroscopic behaviour of N-methyl-2-pyrrolidone (NMP) and N,N-dimethylacetamide (DMAc), which are tertiary amide compounds that bear five-membered cyclic and open structures, respectively. They were examined to investigate the formation of anti-parallel dimers and tetramers in a dipole configuration in the pure liquid state and in benzene solution over a wide concentration range at 25 °C. Because the Kirkwood correlation factors of electric dipoles considerably decreased with increasing concentrations in both the NMP and DMAc systems and because the second DE relaxation modes were clearly observed to exhibit relaxation times that are longer than those of the first modes assigned to the rotational relaxation of monomeric molecules, anti-parallel dimers are formed due to dipole-dipole interactions with increasing concentrations. Assuming a chemical process between the monomers (MONs) and the anti-parallel dimer (DIM), 2MON ⇄ DIM, the equilibrium constants for the anti-parallel dimer formation were determined to be KDEd ∼ 1.2 M-1 for NMP and 0.35 M-1 for DMAc, based on the first DE relaxation strength. The fact that the evaluated KDEd values substantially increased with increasing concentrations in the range above ca. 1.0 M strongly suggested the formation of higher order intermolecular associations instead of dimers. Chemical shifts in the 1H-NMR spectra assigned to (N)CH3 and (5)CH2 protons of NMP and the two (Nα)CH3 and (Nβ)CH3 protons of DMAc dissolved in (d)Bz substantially changed with increasing concentrations due to the formation of intermolecular associations. The states occupied by MONs, DIMs and tetramers (TETs) were evaluated from chemical shift data as a function of the concentrations in the NMP and DMAc systems. Then, the equilibrium constants for the dimer and tetramer formation (2DIM ⇄ TET) were determined to be KNMRd ∼ 1.2 M-1 and KNMRt ∼ 0.2 M-1 for NMP and KNMRd ∼ 0.35 M-1 and KNMRt ∼ 0.25 M-1 for DMAc. The reason for the differences in the equilibrium constants between NMP and DMAc may be related to the difference in motional freedom between the cyclic and open structures. The formation of anti-parallel DIMs and TETs was also confirmed by semi-empirical quantum chemical calculations for both NMP and DMAc molecules.
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Affiliation(s)
- Ayana Tagawa
- Division of Natural Resources and Eco-Materials, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan.
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Basma N, Cullen PL, Clancy AJ, Shaffer MSP, Skipper NT, Headen TF, Howard CA. The liquid structure of the solvents dimethylformamide (DMF) and dimethylacetamide (DMA). Mol Phys 2019. [DOI: 10.1080/00268976.2019.1649494] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- N. Basma
- Department of Physics & Astronomy, University College London, London, UK
- Department of Chemistry and Department of Materials, Imperial College London, London, UK
| | - P. L. Cullen
- Department of Chemical Engineering, University College London, London, UK
| | - A. J. Clancy
- Department of Physics & Astronomy, University College London, London, UK
- Department of Chemistry, University College London, London, UK
| | - M. S. P. Shaffer
- Department of Chemistry and Department of Materials, Imperial College London, London, UK
| | - N. T. Skipper
- Department of Physics & Astronomy, University College London, London, UK
| | - T. F. Headen
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, UK
| | - C. A. Howard
- Department of Physics & Astronomy, University College London, London, UK
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Rodríguez-Laguna MDR, Gómez-Romero P, Sotomayor Torres CM, Chavez-Angel E. Modification of the Raman Spectra in Graphene-Based Nanofluids and Its Correlation with Thermal Properties. NANOMATERIALS 2019; 9:nano9050804. [PMID: 31130687 PMCID: PMC6566612 DOI: 10.3390/nano9050804] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 05/15/2019] [Accepted: 05/24/2019] [Indexed: 11/16/2022]
Abstract
It is well known that by dispersing nanoparticles in a fluid, the thermal conductivity of the resulting nanofluid tends to increase with the concentration of nanoparticles. However, it is not clear what the mechanism behind this phenomenon is. Raman spectroscopy is a characterization technique connecting the molecular and macroscopic world, and therefore, it can unravel the puzzling effect exerted by the nanomaterial on the fluid. In this work, we report on a comparative study on the thermal conductivity, vibrational spectra and viscosity of graphene nanofluids based on three different amides: N, N-dimethylacetamide (DMAc); N, N-dimethylformamide (DMF); and N-methyl-2-pyrrolidinone (NMP). A set of concentrations of highly stable surfactant-free graphene nanofluids developed in-house was prepared and characterized. A correlation between the modification of the vibrational spectra of the fluids and an increase in their thermal conductivity in the presence of graphene was confirmed. Furthermore, an explanation of the non-modification of the thermal conductivity in graphene-NMP nanofluids is given based on its structure and a peculiar arrangement of the fluid.
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Affiliation(s)
- María Del Rocío Rodríguez-Laguna
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
- Department of Chemistry, Universitat Autònoma de Barcelona, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Pedro Gómez-Romero
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Clivia M Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
- ICREA- Institució Catalana de Recerca i Estudis Avançats, Pg. Lluís Companys 23, 08010 Barcelona, Spain.
| | - Emigdio Chavez-Angel
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain.
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