1
|
Ridley RE, Alvarado E, Mrse AA, Vasquez VR, Graeve OA. Phase Stability and Miscibility in Ethanol/AOT/ n-Heptane Systems: Evidence of Multilayered Cylindrical and Spherical Microemulsion Morphologies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11274-11283. [PMID: 32897721 DOI: 10.1021/acs.langmuir.0c01851] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We describe the effects of ethanol on the phase behavior of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in n-heptane. Using dynamic light scattering (DLS), molecular dynamics (MD) simulations, and nuclear magnetic resonance (1H NMR) spectroscopy, we investigate the aggregation behavior of AOT across a wide range of ethanol/AOT/n-heptane compositions. We conclude that reverse micelles do not form at any of the investigated concentrations. Instead, we observe the formation of other surfactant aggregate morphologies unique to this system, namely, multilayered cylindrical structures and spherical AOT-in-ethanol structures, which vary significantly with changes in ethanol concentration. We also identify mixed-solvent polarity as a driving factor for the surfactant behavior in the system. When the concentration of ethanol is 20 wt % or below, the system is inhomogeneous with varying sizes of AOT, ethanol, and AOT + ethanol aggregates, with the ethanol primarily exhibiting a cosurfactant behavior, almost exclusively binding at the surface of AOT aggregates. With increased ethanol concentration, the ethanol in the system also exhibits solvent-like behaviors in addition to the cosurfactant behaviors. Most significantly, when the ethanol concentration is raised above 35 wt %, the transition to solvent-like behavior allows AOT Na+ counterions to dissociate from the headgroups and they are dissolved in the ethanol. We use these results to construct a preliminary phase diagram for the ethanol/AOT/n-heptane system.
Collapse
Affiliation(s)
- Robyn E Ridley
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093-0411, United States
| | - Erick Alvarado
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093-0411, United States
| | - Anthony A Mrse
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093-0307, United States
| | - Victor R Vasquez
- Chemical and Materials Engineering, University of Nevada, Reno, Nevada 89557, United States
| | - Olivia A Graeve
- Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, California 92093-0411, United States
| |
Collapse
|
2
|
Probing the interfacial transition of acetonitrile/AOT/n-heptane microemulsion through in situ silver colloid synthesis. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.079] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
3
|
Singha D, Sahu DK, Sahu K. Anomalous Spectral Modulation of 4-Aminophthalimide inside Acetonitrile/AOT/ n-Heptane Microemulsion: New Insights on Reverse Micelle to Bicontinuous Microemulsion Transition. J Phys Chem B 2018; 122:6966-6974. [PMID: 29901391 DOI: 10.1021/acs.jpcb.8b03901] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The behavior of acetonitrile/sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT)/ n-heptane microemulsion, whether it remains as reverse micelle (RM) or bicontinuous microemulsion (BMC), has been controversial and even termed as a "problem system". Herein, we investigate the microemulsion using spectral and dynamical responses of a hydrophilic solvatochromic fluorophore 4-aminophthalimide (4-AP) at different ws values (=[acetonitrile]/[AOT]). Interestingly, we found that emission parameters of 4-AP within the microemulsion vary differently at low and high ws regimes. The quantum yield (ϕf) and lifetime (τf) of 4-AP first increase up to ws = ∼1 and, thereafter, decrease upon a further increase in the ws values. The emission maximum of 4-AP significantly shifts to a higher wavelength from 445 nm at ws = 0 to 475 nm at ws = 8. Interestingly, unlike aqueous RMs, the emission maximum at ws = 1 matches with the emission maximum in neat acetonitrile and the emission maximum shifts to even longer wavelength at a higher ws. Steady-state anisotropy also shows a break around ws = 1; anisotropy decreases very sharply from ws = 0 to 1 and, thereafter, remains nearly constant. Solvation dynamics becomes progressively faster with an increase in the acetonitrile content only in the low ws regimes but remains almost independent of ws after ws > 2. All of the results collectively indicate that the morphology of the microemulsion may change at an intermediate ws (∼1); below this, the system behaves like reverse micelles, and above this, the system may remain as BMC. The conjecture was further supported by dynamic light scattering measurements, where we observed a gradual increment of the average size at the low acetonitrile content (up to ws = 1) but, thereafter, the size distribution becomes multimodal and sizes cannot be estimated correctly.
Collapse
Affiliation(s)
- Debabrata Singha
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , Assam , India
| | - Dillip Kumar Sahu
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , Assam , India
| | - Kalyanasis Sahu
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , Assam , India
| |
Collapse
|
4
|
Pandey R, Prabhu AA, Dasu VV. Purification of recombinant human interferon gamma from fermentation broth using reverse micellar extraction: A process optimization study. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2017.1395463] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Rajat Pandey
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati India
| | - Ashish Anand Prabhu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati India
| | - Veeranki Venkata Dasu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati India
| |
Collapse
|
5
|
Anionic surfactant based reverse micellar extraction of l-asparaginase synthesized by Azotobacter vinelandii. Bioprocess Biosyst Eng 2017; 40:1163-1171. [DOI: 10.1007/s00449-017-1777-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 05/01/2017] [Indexed: 10/19/2022]
|
6
|
Stîngă G, Maxim ME, Iovescu A, Mihăiescu DE, Băran A, Leontieş AR, Balcan M, Anghel DF. NRET — A rapid method to investigate the water–oil interface in reverse micellar systems. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2015.12.066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
7
|
Chuo SC, Mohd-Setapar SH, Mohamad-Aziz SN, Starov VM. A new method of extraction of amoxicillin using mixed reverse micelles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.107] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
8
|
Mohd-Setapar SH, Mohamad-Aziz SN, Chuong CS, Che Yunus MA, Ahmad Zaini MA, Kamaruddin MJ. A REVIEW OF MIXED REVERSE MICELLE SYSTEM FOR ANTIBIOTIC RECOVERY. CHEM ENG COMMUN 2014. [DOI: 10.1080/00986445.2013.819799] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
9
|
Locations of methanol in methanol-containing AOT reverse micelles revealed by photophysics of IR125. J Photochem Photobiol A Chem 2013. [DOI: 10.1016/j.jphotochem.2012.12.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
10
|
Correa NM, Silber JJ, Riter RE, Levinger NE. Nonaqueous Polar Solvents in Reverse Micelle Systems. Chem Rev 2012; 112:4569-602. [DOI: 10.1021/cr200254q] [Citation(s) in RCA: 204] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Juana J. Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia
Postal #3, C.P. X5804BYA Río Cuarto, Argentina
| | - Ruth E. Riter
- Department of Chemistry, Agnes Scott College, Decatur, Georgia 30030-3770, United
States
| | - Nancy E. Levinger
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872,
United States
| |
Collapse
|
11
|
Porcal GV, Arbeloa EM, Orallo DE, Bertolotti SG, Previtali CM. Photophysics of safranine-O and phenosafranine in reverse micelles of BHDC. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2011.10.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
12
|
Fanun M, Makharza S, Sowwan M. Fluorescence Spectroscopy Study of Polyoxyethylene Surfactant Micellar Systems. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903294196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
13
|
Fanun M, Makharza S, Sowwan M. Transition from Micelles to Microemulsions in Sugar-Based Surfactant Systems Probed by Fluorescence Spectroscopy and Atomic Force Microscopy. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903218153] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
14
|
Setua P, Pramanik R, Sarkar S, Ghatak C, Das SK, Sarkar N. Synthesis of Silver Nanoparticle Inside the Nonaqueous Ethylene Glycol Reverse Micelle and a Comparative Study to Show the Effect of the Nanoparticle on the Reverse Micellar Aggregates through Solvation Dynamics and Rotational Relaxation Measurements. J Phys Chem B 2010; 114:7557-64. [DOI: 10.1021/jp1008048] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Palash Setua
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| | - Rajib Pramanik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| | - Souravi Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| | - Chiranjib Ghatak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| | - S. K. Das
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India, and Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700 064, WB, India
| |
Collapse
|
15
|
Modification of interface of water/AOT/isooctane reverse micelles by halogenated organodiselenides. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2009.11.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|