1
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Singh M, Singh G, Kaur H, Muskan, Kumar S, Aswal VK, Kang TS. Self-assembly of choline-based surface-active ionic liquids and concentration-dependent enhancement in the enzymatic activity of cellulase in aqueous medium. Phys Chem Chem Phys 2024; 26:16218-16233. [PMID: 38804505 DOI: 10.1039/d4cp01236d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The micellization of choline-based anionic surface-active ionic liquids (SAILs) having lauroyl sarcosinate [Sar]-, dodecylsulfate [DS]-, and deoxycholate [Doc]- as counter-ions was investigated in an aqueous medium. Density functional theory (DFT) was employed to investigate the net interactional energy (Enet), extent of non-covalent interactions, and band gap of the choline-based SAILs. The critical micelle concentration (cmc) along with various parameters related to the surface adsorption, counter-ion binding (β), and polarity of the cores of the micelles were deduced employing surface tension measurements, conductometric titrations and fluorescence spectroscopy, respectively. A dynamic light scattering (DLS) system equipped with zeta-potential measurement set-up and small-angle neutron scattering (SANS) were used to predict the size, zeta-potential, and morphology, respectively, of the formed micelles. Thermodynamic parameters such as standard Gibb's free energy and standard enthalpy change of micellization were calculated using isothermal titration calorimetry (ITC). Upon comparing with sodium salt analogues, it was established that the micellization was predominantly governed by the extent of hydration of [Cho]+, the head groups of the respective anions, and the degree of counter-ion binding (β). Considering the concentration dependence of the enzyme-SAIL interactions, aqueous solutions of the synthesized SAILs at two different concentrations (below and above the cmc) were utilized as the medium for testing the enzymatic activity of cellulase. The activity of cellulase was found to be ∼7- to ∼13-fold higher compared to that observed in buffers in monomeric solutions of the SAILs and followed the order: [Cho][Sar] > [Cho][DS] > [Cho][Doc]. In the micellar solution, a ∼4- to 5-fold increase in enzymatic activity was observed.
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Affiliation(s)
- Manpreet Singh
- Department of Chemistry, UGC-Centre for Advance Studies - II, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Gurbir Singh
- Department of Chemistry, UGC-Centre for Advance Studies - II, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Harmandeep Kaur
- Department of Chemistry, UGC-Centre for Advance Studies - II, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Muskan
- Department of Chemistry, UGC-Centre for Advance Studies - II, Guru Nanak Dev University, Amritsar, 143005, India.
| | - Sugam Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Vinod Kumar Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Tejwant Singh Kang
- Department of Chemistry, UGC-Centre for Advance Studies - II, Guru Nanak Dev University, Amritsar, 143005, India.
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2
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Ukani H, Pratyush, Kumar S, Aswal VK, Al‐Ghamdi AA, Malek NI. Cholesterol Mediated Stable Vesicles: A Nano Drug Delivery Vehicle for Anti‐cancer Drugs Curcumin and 5‐Fluorourecil. ChemistrySelect 2022. [DOI: 10.1002/slct.202201613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hiral Ukani
- Ionic Liquids Research Laboratory Department of Chemistry Sardar Vallabhbhai National Institute of Technology Surat 395007 Gujarat India
| | - Pratyush
- Ionic Liquids Research Laboratory Department of Chemistry Sardar Vallabhbhai National Institute of Technology Surat 395007 Gujarat India
| | - Sugam Kumar
- Solid State Physics Division Bhabha Atomic Research Centre, Trombay Mumbai 400085 India
| | - Vinod K Aswal
- Solid State Physics Division Bhabha Atomic Research Centre, Trombay Mumbai 400085 India
| | - Azza A. Al‐Ghamdi
- Department of Chemistry College of Science Imam Abdul Rahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia
- Basic & Applied Scientific Research Center (BASRC) Water Treatment Unit Imam Abdulrahman Bin Faisal University P.O. Box 1982 Dammam 31441 Saudi Arabia
| | - Naved I. Malek
- Ionic Liquids Research Laboratory Department of Chemistry Sardar Vallabhbhai National Institute of Technology Surat 395007 Gujarat India
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3
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Patel N, Soni SS, Patel N, Patel K, Patel VK, Sharma D, Panjabi SH. Synthesis, Self-Aggregation, Surface Characteristics, Electrochemical Property, Micelle Size, and Antimicrobial Activity of a Halogen-Free Picoline-Based Surface-Active Ionic Liquid. ACS OMEGA 2022; 7:28974-28984. [PMID: 36033664 PMCID: PMC9404176 DOI: 10.1021/acsomega.2c02612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
We present a new approach toward the design of a halogen-free picoline-based surface-active ionic liquid (SAIL) (1-octyl-4-methyl pyridinium dodecyl sulfate) [C8γPic]DS consisting of long dodecyl sulfate (DS) as an anion. The surface properties, micellization behavior, and antimicrobial activity in an aqueous solution were investigated using tensiometry, conductometry, and ultraviolet (UV) spectroscopy. Incorporating the DS group in SAIL leads to lower critical micellar concentration (CMC) and enhanced adsorption at the air/water interface of the functionalized ionic liquid compared to the C8-alkyl chain-substituted pyridine ionic liquids. The antimicrobial activity was evaluated against a representative Gram-negative and Gram-positive bacteria panel. Antibacterial activities increased with the alkyl chain length, C8 being the homologous most effective antimicrobial agent. The micelle size of [C8γPic]DS was determined by the dynamic light-scattering (DLS) study. Cyclic voltammetry (CV) measurements have been employed to evaluate the interaction between the SAIL micelle and working electrode, diffusion coefficient, and micelle size of the SAIL solution. The diffusion coefficient explored the correlation of surface properties and the antimicrobial activity of [C8γPic]DS. This halogen-free SAIL is the future of wetting agents and emulsion studies in agriculture due to its small micelle size and surface characteristics.
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Affiliation(s)
- Nidhi
N. Patel
- Department
of Chemical Sciences, P. D. Patel Institute of Applied Sciences, CHARUSAT University, Changa, Gujarat 388421, India
| | - Saurabh S. Soni
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Anand, Gujarat388120, India
| | - Niraj Patel
- Organic
Chemistry Department, Institute of Science and Technology for Advanced
Research (ISTAR), CVM University, Vallabh Vidyanagar, Anand, Gujarat 388120, India
| | - Kiran Patel
- Director,
Grow Leaf Biotech Private Limited, Anand, Gujarat 388120, India
| | - Vaibhav K. Patel
- Department
of Chemical Sciences, P. D. Patel Institute of Applied Sciences, CHARUSAT University, Changa, Gujarat 388421, India
| | - Deep Sharma
- Department
of Chemical Sciences, P. D. Patel Institute of Applied Sciences, CHARUSAT University, Changa, Gujarat 388421, India
| | - Sanjay H. Panjabi
- Department
of Chemical Sciences, P. D. Patel Institute of Applied Sciences, CHARUSAT University, Changa, Gujarat 388421, India
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4
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Synthesis and surface properties of sodium sulfonate amphoteric surfactants having different hydrophobic carbon chain length. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04719-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Patel NN, Patel K, Sastry NV, Patel VK, Macwan PM, Sharma DS, Panjabi SH. Halogen-free COOH functionalized surface-active ionic liquids: surface activity, aggregation behavior, and antimicrobial activity. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.2010565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Nidhi N. Patel
- Department of Chemical Sciences, P.D. Patel Institute of Applied Sciences, Charusat, Changa, Gujarat, India
| | - Kiran Patel
- Department of Biological Sciences, P.D. Patel Institute of Applied Sciences, Charusat, Changa, Gujarat, India
| | - Nandhibatla V. Sastry
- Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Gujarat, India
| | - Vaibhav K. Patel
- Department of Chemical Sciences, P.D. Patel Institute of Applied Sciences, Charusat, Changa, Gujarat, India
| | - Pradip M. Macwan
- B.N. Patel Institute of Paramedical & Sciences, Anand, Gujarat, India
| | - Deep S. Sharma
- Department of Chemical Sciences, P.D. Patel Institute of Applied Sciences, Charusat, Changa, Gujarat, India
| | - Sanjay. H. Panjabi
- Department of Chemical Sciences, P.D. Patel Institute of Applied Sciences, Charusat, Changa, Gujarat, India
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6
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Ionic liquid-based catanionic vesicles: A de novo system to judiciously improve the solubility, stability and antimicrobial activity of curcumin. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117396] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Physicochemical studies on the interfacial and aggregation behavior of immidazolium- and pyrrolinidium-dodecyl sulfate in aqueous medium. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Sarkar R, Pal A, Rakshit A, Saha B. Properties and applications of amphoteric surfactant: A concise review. J SURFACTANTS DETERG 2021. [DOI: 10.1002/jsde.12542] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ratan Sarkar
- Homogeneous Catalysis Laboratory, Department of Chemistry The University of Burdwan Burdwan West Bengal India
| | - Aniruddha Pal
- Homogeneous Catalysis Laboratory, Department of Chemistry The University of Burdwan Burdwan West Bengal India
| | - Atanu Rakshit
- Homogeneous Catalysis Laboratory, Department of Chemistry The University of Burdwan Burdwan West Bengal India
| | - Bidyut Saha
- Homogeneous Catalysis Laboratory, Department of Chemistry The University of Burdwan Burdwan West Bengal India
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9
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Betaine and l-carnitine ester bromides: Synthesis and comparative study of their thermal behaviour and surface activity. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115988] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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10
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Nadimi H, Housaindokht MR, Moosavi F. The effect of anion on aggregation of amino acid ionic liquid: Atomistic simulation. J Mol Graph Model 2020; 101:107733. [PMID: 32931983 DOI: 10.1016/j.jmgm.2020.107733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 08/22/2020] [Accepted: 08/31/2020] [Indexed: 12/26/2022]
Abstract
Aggregation behavior of dodecyl betaine chloride [DB][Cl], as an amino acid ionic liquid, and dodecyl betaine N-acetyl glycinate [DB][AG], as a bio ionic liquid, in aqueous media was studied through molecular dynamics simulation. The aggregating was investigated by radial distribution function, coordination numbers, and hydrogen bond numbers. The results demonstrated the hydrogen bond between [DB]+ and [AG]- that leads to aggregation. The number of hydrogen bonds of [DB][AG] is greater than [DB][Cl] and causes a decrease in the gradient of the mean square displacement, thereby the diffusion coefficient of cation, anion, and water in [DB][AG]. The results point to a stable aggregation of [DB][AG] which is in agreement with the results of root mean square deviations. The aggregation number for [DB][AG] is 50 and 44 for [DB][Cl]. Computing the radius of gyration and geometrical radius shows that the aggregation size is 23.0 Å and 26.4 Å for [DB][AG] and [DB][Cl], respectively. It was also observed that the shape of the aggregates is quasi-spherical that points to a sub-diffusive regime.
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Affiliation(s)
- Hanieh Nadimi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran
| | | | - Fatemeh Moosavi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.
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11
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Shah A, Kuddushi M, Ray D, Aswal VK, Malek NI. Sodium Salicylate Mediated Ionic Liquid Based Catanionic Coacervates as Membrane‐Free Microreactors for the Selective Sequestration of Dyes and Curcumin. CHEMSYSTEMSCHEM 2019. [DOI: 10.1002/syst.201900029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ankit Shah
- Applied Chemistry DepartmentS.V. National Institute of Technology Surat 395007, Gujarat India
| | - Muzammil Kuddushi
- Applied Chemistry DepartmentS.V. National Institute of Technology Surat 395007, Gujarat India
| | - Debes Ray
- Solid State Physics DivisionBhabha Atomic Research Centre Trombay Mumbai 400085 India
| | - Vinod K Aswal
- Solid State Physics DivisionBhabha Atomic Research Centre Trombay Mumbai 400085 India
| | - Naved I. Malek
- Applied Chemistry DepartmentS.V. National Institute of Technology Surat 395007, Gujarat India
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12
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Yang X, Zhang P, Lv W, Zhou T, Li P, Zhao M. Aggregation Behavior of Imidazolium‐Based Amino Acid Ionic Liquid Surfactants in Aqueous Solution: The Effect of Amino Acid Counterions. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Xiu‐Jie Yang
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
| | - Peng Zhang
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
| | - Wenjiao Lv
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
| | - Ting Zhou
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
| | - Peng Li
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
| | - Mingwei Zhao
- State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum (East China) 66 Changjiang West Road, Qingdao, 266580 China
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13
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Shah A, Kuddushi M, Rajput S, El Seoud OA, Malek NI. Ionic Liquid-Based Catanionic Coacervates: Novel Microreactors for Membrane-Free Sequestration of Dyes and Curcumin. ACS OMEGA 2018; 3:17751-17761. [PMID: 31458372 PMCID: PMC6643423 DOI: 10.1021/acsomega.8b02455] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 12/04/2018] [Indexed: 05/08/2023]
Abstract
Surfactant-mediated coacervates are termed as the new age microreactors for their ability to spontaneously sequester the molecules with varied polarities and functionalities. Efforts to emulate this applicability of coacervates through synthetic control of surfactant structures are finding success; however, there is little understanding of how to translate these changes into tailor-made properties. Herein, we designed 3-methyl-1-(octyloxycarbonylmethyl)imidazolium bromide (C8EMeImBr), an ester-functionalized ionic liquid-based surfactant, which shows better surface active properties than the nonfunctionalized and conventional cationic surfactant and forms complex coacervates over the broad range of concentration with sodium salicylate (NaSal). Mono- and divalent cations as well as ionic strength, viscosity, and time-dependent stability of the coacervates had also been addressed in order to study whether these coacervates could work as microreactors to encapsulate various molecules. The anionic charged complex coacervates with sponge morphology and honey comb-like interior show good efficiency to sequester cationic dyes from water because of electrostatic and hydrophobic interactions and good encapsulation efficiency for curcumin owing to their high surface area. Results suggest that ionic liquid-based coacervates studied here could be exploited as a novel low-cost, effective, and environmentally benign alternative to sequester dyes from the contaminated water and their recovery.
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Affiliation(s)
- Ankit Shah
- Applied
Chemistry Department, S.V. National Institute
of Technology, Surat 395007, Gujarat, India
| | - Muzammil Kuddushi
- Applied
Chemistry Department, S.V. National Institute
of Technology, Surat 395007, Gujarat, India
| | - Sargam Rajput
- Applied
Chemistry Department, S.V. National Institute
of Technology, Surat 395007, Gujarat, India
| | - Omar A. El Seoud
- Institute
of Chemistry, The University of Sao Paulo, 748 Prof. Lineu Prestes Av., Sao Paulo SP 05508-000, Brazil
| | - Naved I. Malek
- Applied
Chemistry Department, S.V. National Institute
of Technology, Surat 395007, Gujarat, India
- E-mail: , (N.I.M.)
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14
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Kuddushi M, Patel NK, Rajput S, Shah A, El Seoud OA, Malek NI. Thermo-Switchable de Novo Ionic Liquid-Based Gelators with Dye-Absorbing and Drug-Encapsulating Characteristics. ACS OMEGA 2018; 3:12068-12078. [PMID: 30320287 PMCID: PMC6175494 DOI: 10.1021/acsomega.8b01984] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 09/13/2018] [Indexed: 05/04/2023]
Abstract
An ionic liquid-based surfactant with ester functionality self-aggregates in an aqueous medium and forms ionogels at 8.80% (w/v) concentration at physiological pH. The ionogel exhibited a remarkable change in its appearance with temperature from fibrillar opaque to transparent because of the dynamic changes within its supramolecular structure. This gel-to-gel phase transition occurs below the melting point of the solid ionic liquid. The ionogels were investigated using turbidity, differential scanning calorimetry, scanning electron microscopy (SEM), field emission SEM (FE-SEM), inverted microscopy, transmission electron microscopy imaging, Fourier transform infrared spectroscopy, and rheological measurements. The fibrillar opaque ionogel and transparent ionogel were studied for their ability to absorb dyes (methyl orange and crystal violet) and to encapsulate drugs (diclofenac sodium and imatinib mesylate).
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Affiliation(s)
- Muzammil Kuddushi
- Applied
Chemistry Department, S. V. National Institute
of Technology, Surat 395007 Gujarat, India
| | - Nehal K. Patel
- Applied
Chemistry Department, S. V. National Institute
of Technology, Surat 395007 Gujarat, India
| | - Sargam Rajput
- Applied
Chemistry Department, S. V. National Institute
of Technology, Surat 395007 Gujarat, India
| | - Ankit Shah
- Applied
Chemistry Department, S. V. National Institute
of Technology, Surat 395007 Gujarat, India
| | - Omar A. El Seoud
- Institute
of Chemistry, The University of Sao Paulo, 748 Prof. Lineu Prestes Av., São Paulo, São Paulo 05508-000, Brazil
| | - Naved I. Malek
- Applied
Chemistry Department, S. V. National Institute
of Technology, Surat 395007 Gujarat, India
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15
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Vaid ZS, Rajput SM, Shah A, Kadam Y, Kumar A, El Seoud OA, Mata JP, Malek NI. Salt-Induced Microstructural Transitions in Aqueous Dispersions of Ionic-Liquids-Based Surfactants. ChemistrySelect 2018. [DOI: 10.1002/slct.201800041] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Zuber S. Vaid
- Applied Chemistry Department; S.V.National Institute of Technology; Surat-395007 Gujarat India
| | - Sargam M. Rajput
- Applied Chemistry Department; S.V.National Institute of Technology; Surat-395007 Gujarat India
| | - Ankit Shah
- Applied Chemistry Department; S.V.National Institute of Technology; Surat-395007 Gujarat India
| | - Yogesh Kadam
- Applied Chemistry Department; S.V.National Institute of Technology; Surat-395007 Gujarat India
| | - Arvind Kumar
- Salt and Marine Chemicals Division; CSIR-Central Salt and Marine Chemicals; Research Institute, G. B. Marg; Bhavnagar-364002 India
| | - Omar A. El Seoud
- Institute of Chemistry; The University of São Paulo, P. O. Box 26077; 05513-970 São Paulo, SP Brazil
| | - Jitendra P. Mata
- Australian Centre for Neutron Scattering; Australian Nuclear Science and Technology Organization (ANSTO); Locked Bag 2001, Kirrawee D.C. NSW 2232 Australia
| | - Naved I. Malek
- Applied Chemistry Department; S.V.National Institute of Technology; Surat-395007 Gujarat India
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16
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Micellization and adsorption of zwitterionic surfactants at the air/water interface. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.09.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Garcia MT, Ribosa I, Perez L, Manresa A, Comelles F. Micellization and Antimicrobial Properties of Surface-Active Ionic Liquids Containing Cleavable Carbonate Linkages. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6511-6520. [PMID: 28605906 DOI: 10.1021/acs.langmuir.7b00505] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Imidazolium-based ionic liquids (ILs) containing cleavable carbonate linkages, 1-alkyloxycarbonyloxyethyl-3-methylimidazolium chlorides with alkyl chains of 10, 12, and 14 carbon atoms, were synthesized, and their self-assembly behavior and antimicrobial activity were investigated. Differential scanning calorimetry and polarized optical microscopy studies reveal that carbonate-functionalized ILs form stable thermotropic smectic liquid-crystalline phases over a wide range of temperature. The surface activity and aggregation behavior of these new ILs were investigated by tensiometry, conductometry, potentiometry, and spectrofluorimetry. The size of aggregates was examined by dynamic light scattering (DLS). Carbonate-functionalized ILs display a higher adsorption efficiency and a lower critical micelle concentration (cmc) than simple alkyl-chain-substituted ILs. The insertion of a carbonate ester moiety in the alkyl side chain favors adsorption at the air-water interface and micellization in the bulk solution when compared to nonfunctionalized ILs. DLS measurements show that small micellelike aggregates are spontaneously formed above the cmc. Furthermore, carbonate-functionalized ILs were examined for their antimicrobial activity against a panel of clinically relevant microorganisms. Biological activity was found to increase with hydrophobicity. The presence of a carbonate ester moiety significantly enhances the antimicrobial efficiency as compared to nonfunctionalized ILs, with the susceptibility of Staphylococcus sp. toward the action of these compounds being particularly remarkable. It has been demonstrated that the functionalization of the alkyl side chain of the imidazolium salts can not only modify the aggregation behavior but also lead to differences in both efficiency and the spectrum of antimicrobial activity of amphiphilic ILs.
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Affiliation(s)
- M Teresa Garcia
- Department of Chemical and Surfactants Technology, Institute of Advanced Chemistry of Catalonia IQAC- CSIC , Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Isabel Ribosa
- Department of Chemical and Surfactants Technology, Institute of Advanced Chemistry of Catalonia IQAC- CSIC , Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Lourdes Perez
- Department of Chemical and Surfactants Technology, Institute of Advanced Chemistry of Catalonia IQAC- CSIC , Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Angeles Manresa
- Facultat de Farmacia, Universitat de Barcelona , Joan XXIII, 08028 Barcelona, Spain
| | - Francesc Comelles
- Department of Chemical and Surfactants Technology, Institute of Advanced Chemistry of Catalonia IQAC- CSIC , Jordi Girona 18-26, 08034 Barcelona, Spain
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18
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Raghavan V, Polavarapu PL. First Room Temperature Chiral Anionic Liquid Forming Micelles and Reverse Micelles. J Phys Chem B 2017; 121:1629-1639. [DOI: 10.1021/acs.jpcb.6b11964] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Vijay Raghavan
- Department of Chemistry, Vanderbilt University, Nashville, Tennesse 37235, United States
| | - Prasad L Polavarapu
- Department of Chemistry, Vanderbilt University, Nashville, Tennesse 37235, United States
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19
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Lu H, Drelich A, Omri M, Pezron I, Wadouachi A, Pourceau G. Catalytic Synthesis of a New Series of Alkyl Uronates and Evaluation of Their Physicochemical Properties. Molecules 2016; 21:molecules21101301. [PMID: 27689983 PMCID: PMC6273592 DOI: 10.3390/molecules21101301] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 09/13/2016] [Accepted: 09/22/2016] [Indexed: 11/26/2022] Open
Abstract
Large quantities (>3 g) of a new series of alkyl uronates were synthesized in two steps from commercial methyl hexopyranosides. Firstly, several tens of grams of free methyl α-d-glucopyranoside were selectively and quantitatively oxidized into corresponding sodium uronate using 2,2,6,6-tetramethyl-1-piperidinyloxy free radical (TEMPO)-catalyzed oxidation. Hydrophobic chains of different length were then introduced by acid-mediated esterification with fatty alcohols (ethyl to lauryl alcohol) leading to the desired alkyl glucuronates with moderate to good yields (49%–72%). The methodology was successfully applied to methyl α-d-mannopyranoside and methyl β-d-galactopyranoside. Physicochemical properties, such as critical micelle concentration (CMC), equilibrium surface tension at CMC (γcmc), solubility, and Krafft temperature were measured, and the effect of structural modifications on surface active properties and micelle formation was discussed.
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Affiliation(s)
- Huiling Lu
- TIMR EA 4297 UTC/ESCOM, Sorbonne University, University of Technology of Compiègne, Rue Personne de Roberval, Compiègne CEDEX 60200, France.
| | - Audrey Drelich
- TIMR EA 4297 UTC/ESCOM, Sorbonne University, University of Technology of Compiègne, Rue Personne de Roberval, Compiègne CEDEX 60200, France.
| | - Mehdi Omri
- LG2A, UMR CNRS 7378-Chemistry Institute of Picardy FR CNRS 3085, University of Picardy Jules Verne, 33 rue Saint Leu, Amiens CEDEX 80039, France.
| | - Isabelle Pezron
- TIMR EA 4297 UTC/ESCOM, Sorbonne University, University of Technology of Compiègne, Rue Personne de Roberval, Compiègne CEDEX 60200, France.
| | - Anne Wadouachi
- LG2A, UMR CNRS 7378-Chemistry Institute of Picardy FR CNRS 3085, University of Picardy Jules Verne, 33 rue Saint Leu, Amiens CEDEX 80039, France.
| | - Gwladys Pourceau
- LG2A, UMR CNRS 7378-Chemistry Institute of Picardy FR CNRS 3085, University of Picardy Jules Verne, 33 rue Saint Leu, Amiens CEDEX 80039, France.
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20
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Chabba S, Vashishat R, Kang TS, Mahajan RK. Self-aggregation Behavior of Dialkyl Imidazolium based Ionic Liquids in Aqueous Medium: Effect of Alkyl Chain Length. ChemistrySelect 2016. [DOI: 10.1002/slct.201600301] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shruti Chabba
- Department of Chemistry; UGC-Centre for Advanced Studies-II; Guru Nanak Dev University; Amritsar-143005 India
| | - Rajni Vashishat
- Department of Chemistry; UGC-Centre for Advanced Studies-II; Guru Nanak Dev University; Amritsar-143005 India
| | - Tejwant S. Kang
- Department of Chemistry; UGC-Centre for Advanced Studies-II; Guru Nanak Dev University; Amritsar-143005 India
| | - Rakesh K. Mahajan
- Department of Chemistry; UGC-Centre for Advanced Studies-II; Guru Nanak Dev University; Amritsar-143005 India
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21
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Fan T, Chen C, Fan T, Liu F, Peng Q. Novel surface-active ionic liquids used as solubilizers for water-insoluble pesticides. JOURNAL OF HAZARDOUS MATERIALS 2015; 297:340-346. [PMID: 26047302 DOI: 10.1016/j.jhazmat.2015.05.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 05/17/2015] [Accepted: 05/18/2015] [Indexed: 06/04/2023]
Abstract
Three surface active ionic liquids (ILs) containing organic anions but no halides were used as solubilizers for water insoluble pesticides and as well as alternates for similar ILs with halide anions, which have been increasingly popular in the agricultural practice. The solubilities of five pesticides (fluazifop-P, clethodim, pyrethrin, fosthiazate, and prochloraz) in three aqueous micellar systems, each containing 1-octyl-3-methylimidazolium--tartrate ([OMIM][Tart]), 1-octyl-3-methylimidazolium-l-proline ([OMIM][Prol]), 1-octyl-3-methylimidazolium-l-lactate ([OMIM][lact]), respectively, were measured. The solubilities of all five pesticides were found to increase with the increasing concentrations of ILs solubilzers The enhancements in solubilities were related to surface activities of these SAILs, as indicated in the results of the measurements of their corresponding critical aggregation concentration (CAC), lowest surface tension (γcac), maximum surface excess concentration (Γmax) and minimum area per molecule (Amin) of aqueous solutions of ILs. When comparing with similar ILs with halides as counter anions, we found that these ILs with organic counterions are at least comparable, often more effective solubilizers for all of the five very different pesticides we tested. We conclude that these novel SAILs with organic counterions would serve as at least similarly effective and more environmentally-friendly solubilizers over the more traditional ones with halides.
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Affiliation(s)
- Tengfei Fan
- College of Science, China Agricultural University, Beijing 100091, China
| | - Chong Chen
- College of Science, China Agricultural University, Beijing 100091, China
| | - Tingting Fan
- College of Science, China Agricultural University, Beijing 100091, China
| | - Fengmao Liu
- College of Science, China Agricultural University, Beijing 100091, China
| | - Qingrong Peng
- College of Science, China Agricultural University, Beijing 100091, China.
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22
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Ionic-liquid-based surfactants with unsaturated head group: synthesis and micellar properties of 1-(n-alkyl)-3-vinylimidazolium bromides. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3746-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Tetrasiloxane room temperature ionic liquids: adsorption and aggregation properties in aqueous solution. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3664-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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Cheng N, Hu Q, Guo Y, Wang Y, Yu L. Efficient and selective removal of dyes using imidazolium-based supramolecular gels. ACS APPLIED MATERIALS & INTERFACES 2015; 7:10258-65. [PMID: 25938635 DOI: 10.1021/acsami.5b00814] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A supramolecular gel was constructed by using an imidazolium-based surfactant, N-cetyl-N'-carboxymethyl imidazolium bromide ([N-C16, N'-CO2H-Im]Br), in the DMSO/H2O binary solvent mixtures and investigated as an adsorbent for removing dyes from aqueous solution. The self-assembled gel displays a morphology of microplatelets stacked in bilayer units with interdigitated hydrocarbon tails, and the structure remains unchanged below the sol-gel transition temperature. The gel also exhibits a strong birefringence property and excellent mechanical strength. In particular, the gels show superior performance in removal of anionic dye molecules, for example, removing 80% of eosin Y within 10 min, The constructed gels also present excellent salinity tolerance, even when the concentration of NaCl is 1000 times higher than that of the dye, and can maintain their high efficiency after 25 cycles, indicative of their promise in water treatment.
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Affiliation(s)
- Ni Cheng
- †Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
| | - Qiongzheng Hu
- ‡Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Yongxian Guo
- †Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
| | - Yong Wang
- §China Research Institute of Daily Chemical Industry, Taiyuan, 030001, People's Republic of China
| | - Li Yu
- †Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China
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25
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Ali H, Niazi A, Baloch MK, Durrani GF, Rauf A, Khan A. Effect of Temperature, Polymer, and Salts on the Interfacial and Micellization Behavior of 3-Dodecyl-1-Methyl-1H-Imidazol-3-Ium-Bromide: A Dispersion of a Long-Chain Ionic Liquid. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2014.918514] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Self-assembly and antimicrobial activity of long-chain amide-functionalized ionic liquids in aqueous solution. Colloids Surf B Biointerfaces 2014; 123:318-25. [DOI: 10.1016/j.colsurfb.2014.09.033] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 09/04/2014] [Accepted: 09/15/2014] [Indexed: 11/20/2022]
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27
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Fan T, Wu X, Peng Q. Sparingly Soluble Pesticide Dissolved in Ionic Liquid Aqueous. J Phys Chem B 2014; 118:11546-51. [DOI: 10.1021/jp505376w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tengfei Fan
- College of Science, China Agricultural University, Beijing 100091, China
| | - Xuemin Wu
- College of Science, China Agricultural University, Beijing 100091, China
| | - Qingrong Peng
- College of Science, China Agricultural University, Beijing 100091, China
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28
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Kamboj R, Bharmoria P, Chauhan V, Singh S, Kumar A, Mithu VS, Kang TS. Micellization behavior of morpholinium-based amide-functionalized ionic liquids in aqueous media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9920-30. [PMID: 25062465 DOI: 10.1021/la501897e] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Morpholinium-based amide-functionalized ionic liquids (ILs) [C(n)AMorph][Br], where n = 8, 12, and 16, have been synthesized and characterized for their micellization behavior in aqueous medium using a variety of state of the art techniques. The adsorption and micellization behavior of [CnAMorph][Br] ILs at the air-solution interface and in the bulk, respectively, has been found to be much better compared to that observed for nonfunctionalized homologous ILs and conventional cationic surfactants, as shown by the comparatively higher adsorption efficiency, lower surface tension at the critical micelle concentraiton (γ(cmc)), and much lower critical micelle concentration (cmc) for [C(n)AMorph][Br] ILs. Conductivity measurements have been performed to obtain the cmc, degree of counterion binding (β), and standard free energy of micellization (ΔG(m)°). Isothermal titration calorimetry has provided information specifically about the thermodynamics of micellization, whereas steady-state fluorescence has been used to obtain the cmc, micropolarity of the cybotactic region, and aggregation number (N(agg)) of the micelles. Both dynamic light scattering and atomic force microscopy have provided insights into the size and shape of the micelles. 2D (1)H-(1)H nuclear Overhauser effect spectroscopy experiments have provided insights into the structure of the micelle, where [C16AMorph][Br] has shown distinct micellization behavior as compared to [C8AMorph][Br] and [C12AMorph][Br] in corroboration with observations made from other techniques.
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Affiliation(s)
- Raman Kamboj
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-I, Guru Nanak Dev University , Amritsar-143005, Punjab, India
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29
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Palchowdhury S, Bhargava BL. Effect of Cation Asymmetry on the Aggregation in Aqueous 1-Alkyl,3-decylimidazolium Bromide Solutions: Molecular Dynamics Studies. J Phys Chem B 2014; 118:6241-9. [DOI: 10.1021/jp503301d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sourav Palchowdhury
- School of Chemical Sciences, National Institute of Science Education & Research, Bhubaneswar 751005, Odisha India
| | - B. L. Bhargava
- School of Chemical Sciences, National Institute of Science Education & Research, Bhubaneswar 751005, Odisha India
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30
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Li P, Du Z, Ma X, Wang G, Li G. Synthesis, adsorption and aggregation properties of trisiloxane room-temperature ionic liquids. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2013.12.046] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Li P, Du Z, Wang G, Zhi L, Huazhong S. Adsorption and Aggregation Behavior of n-Undecyl Ammonium Acetate Ionic Liquid in Aqueous Solution. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.788452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Cheng N, Yu P, Wang T, Sheng X, Bi Y, Gong Y, Yu L. Self-Aggregation of New Alkylcarboxylate-Based Anionic Surface Active Ionic Liquids: Experimental and Theoretical Investigations. J Phys Chem B 2014; 118:2758-68. [DOI: 10.1021/jp4124056] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Ni Cheng
- Key
Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Pengming Yu
- China Research
Institute of Daily Chemical Industry, Taiyuan 030001, PR China
| | - Tao Wang
- Production
Technology Institute, Shengli Oilfield, Dongying 257000, PR China
| | - Xiang Sheng
- Key
Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Yanhui Bi
- Key
Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Yanjun Gong
- Key
Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Li Yu
- Key
Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China
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33
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Kamboj R, Bharmoria P, Chauhan V, Singh G, Kumar A, Singh S, Kang TS. Effect of cationic head group on micellization behavior of new amide-functionalized surface active ionic liquids. Phys Chem Chem Phys 2014; 16:26040-50. [DOI: 10.1039/c4cp04054f] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The functionalization of the alkyl chain with an amide group led to marked changes in the characteristic properties of micellization of different SAILs.
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Affiliation(s)
- Raman Kamboj
- Department of Chemistry
- UGC-Centre for Advanced Studies-I
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Pankaj Bharmoria
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar-364002, India
| | - Vinay Chauhan
- Department of Chemistry
- UGC-Centre for Advanced Studies-I
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Gurbir Singh
- Department of Chemistry
- UGC-Centre for Advanced Studies-I
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Arvind Kumar
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-Central Salt and Marine Chemicals Research Institute
- Council of Scientific & Industrial Research (CSIR)
- Bhavnagar-364002, India
| | - Sukhprit Singh
- Department of Chemistry
- UGC-Centre for Advanced Studies-I
- Guru Nanak Dev University
- Amritsar-143005, India
| | - Tejwant Singh Kang
- Department of Chemistry
- UGC-Centre for Advanced Studies-I
- Guru Nanak Dev University
- Amritsar-143005, India
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34
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Muskawar PN, Senthil Kumar S, Bhagat PR. Carboxyl-functionalized ionic liquids based on Benzimidazolium cation: Study of Hammett values and catalytic activity towards one-pot synthesis of 1-amidoalkyl naphthols. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.molcata.2013.09.026] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Chaban VV, Prezhdo OV. Ionic and Molecular Liquids: Working Together for Robust Engineering. J Phys Chem Lett 2013; 4:1423-1431. [PMID: 26282294 DOI: 10.1021/jz400113y] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Because of their outstanding versatility, room-temperature ionic liquids (RTILs) are utilized in an ever increasing number of novel and fascinating applications, making them the Holy Grail of modern materials science. In this Perspective, we address the fundamental research and prospective applications of RTILs in combination with molecular liquids, concentrating on three significant areas: (1) the use of molecular liquids to decrease the viscosity of RTILs; (2) the role of RTIL micelle formation in water and organic solvents; and (3) the ability of RTILs to adsorb pollutant gases. Current achievements are examined, and future directions for the potential uses of RTILs are outlined.
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Affiliation(s)
- Vitaly V Chaban
- †Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
- ‡MEMPHYS - Center for Biomembrane Physics, Odense M. 5230, Denmark
| | - Oleg V Prezhdo
- †Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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36
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Garcia MT, Ribosa I, Perez L, Manresa A, Comelles F. Aggregation behavior and antimicrobial activity of ester-functionalized imidazolium- and pyridinium-based ionic liquids in aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2536-45. [PMID: 23360222 DOI: 10.1021/la304752e] [Citation(s) in RCA: 169] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Two series of long chain imidazolium- and pyridinium-based ionic liquids containing an ester functional group in the alkyl side chain, 3-methyl-1-alkyloxycarbonylmethylimidazolium bromides (C(n)EMeImBr) and 1-alkyloxycarbonylmethylpyridinium bromides (C(n)EPyrBr), were synthesized and their thermal stability, aggregation behavior in aqueous medium, and antimicrobial activity investigated. The introduction of an ester group decreased the thermal stability of the functionalized ILs compared to simple alkyl chain containing ILs (1-alkyl-3-methylimidazolium bromides and 1-alkylpyridinium bromides). Tensiometry, conductimetry, and spectrofluorimetry were applied to study the self-aggregation of the amphiphilic ILs in aqueous solution. The ILs investigated displayed surface activity and the characteristic chain length dependence of the micellization process of surfactants. As compared to simple alkyl chain containing ILs bearing the same hydrocarbon chain, ester-functionalized ILs possess higher adsorption efficiency (pC(20)) and significantly lower critical micelle concentration (cmc) and surface tension at the cmc (γ(cmc)), indicating that the incorporation of an ester group promotes adsorption at the air/water interface and micelle formation. The antimicrobial activity was evaluated against Gram-negative and Gram-positive bacteria and fungi. ILs containing more than eight carbon atoms in the alkyl chain showed antimicrobial activity. Their efficiency as antimicrobial agents increased with the hydrophobicity of the amphiphilic cation being the C(12) homologous the most active compounds. The incorporation of an ester group particularly increased the biological activity against fungi.
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Affiliation(s)
- M Teresa Garcia
- Department of Chemical and Surfactant Technology, Institut de Quimica Avançada de Catalunya IQAC-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
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37
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Contreras R, Aizman A, Tapia RA, Cerda-Monje A. Lewis molecular acidity of ionic liquids from empirical energy-density models. J Phys Chem B 2013; 117:1911-20. [PMID: 23323706 DOI: 10.1021/jp3114946] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two complementary models of Lewis molecular acidity are introduced and tested in a wide series of 45 room temperature ionic liquids (RTIL). They are defined in the context of the conceptual density functional theory. The first one, which we tentatively call the excess electronic chemical potential, assesses the electron accepting power of the RTIL by relating the H-bond donor acidity with the charge transfer associated to the acidic H-atom migration at the cation of the RTIL considered as a HB-donor species. This global index accounts for the molecular acidity of the cation moiety of the ionic liquid that takes into account the perturbation of the anionic partner. The second index is defined in terms of the local charge capacity modeled through the maximum electronic charge that the cation, in its valence state, may accept from an unspecified environment. Each model is compared with the experimental HB-donor acidity parameter of the Kamlet Taft model. The best comparison is obtained for a combination of both the excess electronic chemical potential and the local charge capacity. As expected, the correlations with the Kamlet Taft α parameter do not lead to a universal model of HB-donor acidity. Reduced correlations for limited series of structurally related RTIL are obtained instead. Finally, we illustrate the reliability and usefulness of the proposed model of RTIL molecular acidity to explain the cation-dependent solvent effects on the reactivity trends for cycloaddition, Kemp elimination, and Menschutkin reactions, for which experimental rate coefficients are available from literature.
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Affiliation(s)
- Renato Contreras
- Departamento de Química, Laboratorio de Química Teórica, Universidad de Chile, Facultad de Ciencias, Casilla 653, Santiago, Chile
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