1
|
Bhattacharjee S, Pandit S, Seth D. Solute dynamics in a block copolymer: effect of additives and temperature. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2136587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - Souvik Pandit
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| | - Debabrata Seth
- Department of Chemistry, Indian Institute of Technology Patna, Patna, India
| |
Collapse
|
2
|
Thomas SS, Hosseini-Nejad H, Bohne C. Dynamics of small molecules within the F127 PEO-PPO-PEO triblock copolymer gel and sol phases studied at the molecular scale. SOFT MATTER 2022; 18:1706-1714. [PMID: 35142781 DOI: 10.1039/d2sm00066k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Triplet excited states of guest molecules with different hydrophobicities were used to probe the association and dissociation dynamics of these guests with F127 micelles in the gel and sol phases. The dynamics probed was on a longer length scale than amenable with fluorescence techniques, but at a shorter length scale than probed in translational diffusion studies. The mobility of the guests at the molecular scale showed that subtle changes in the guest's structure affect the guest's release time from the micelles, where the structural features of the guest are more important than the phase, gel vs. sol, of the system.
Collapse
Affiliation(s)
- Suma S Thomas
- Department of Chemistry, University of Victoria, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada.
- Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, 3800 Finnerty Rd, Victoria, BC, V8P 5C2, Canada
| | - Helia Hosseini-Nejad
- Department of Chemistry, University of Victoria, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada.
- Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, 3800 Finnerty Rd, Victoria, BC, V8P 5C2, Canada
| | - Cornelia Bohne
- Department of Chemistry, University of Victoria, PO Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada.
- Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, 3800 Finnerty Rd, Victoria, BC, V8P 5C2, Canada
| |
Collapse
|
3
|
Sahu S, Karan P, Mishra AK. Nature of Saccharide-Induced F127 Micellar Dehydration: An Insight with FDAPT (2-Formyl-5-(4'- N, N-dimethylaminophenyl)thiophene), a Multiparametric Fluorescent Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3067-3074. [PMID: 33650876 DOI: 10.1021/acs.langmuir.0c03284] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
FDAPT (2-formyl-5-(4'-N,N-dimethylaminophenyl)thiophene) is an efficient environment-sensitive fluorescent probe, which senses the alteration of its microenvironment with six different fluorescent parameters, namely, emission intensity, wavelength, fluorescence anisotropy, and corresponding three time-dependent parameters fluorescence lifetime, time-resolved emission spectrum, and anisotropy decay. In the present work, the nature of saccharide-induced dehydration of a F127 polymeric micelle is investigated in detail with FDAPT emission. Using a multiparametric fluorescence approach, it is observed that the saccharide molecules not only decrease the critical micellization temperature of the F127 solution but also strongly alter the physical properties inside the micellar structures. The local polarity and fluidity significantly decrease in the saccharide-induced micelle as compared to the normal F127 micelle. The probe solvation dynamics study reveals that the water content in the core as well as corona domain diminishes significantly in the saccharide-induced micelle as compared to the normal micelle. More precisely, dehydration occurs more in the core region than in the corona region. Also, the saccharide-induced dehydration alters the relative size of the core and corona regions. The extent of dehydration varies with different saccharide molecules. It is also found that the dehydration efficiency order is trisaccharide (raffinose) > disaccharide (sucrose) > monosaccharide (glucose and fructose).
Collapse
Affiliation(s)
- Saugata Sahu
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai 600036, India
| | - Pulak Karan
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai 600036, India
| | - Ashok Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Sardar Patel Road, Adyar, Chennai 600036, India
| |
Collapse
|
4
|
Shaikhullina M, Khaliullina A, Gimatdinov R, Butakov A, Chernov V, Filippov A. NMR relaxation and self-diffusion in aqueous micellar gels of pluronic F-127. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112898] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
5
|
|
6
|
Pal T, Sahu K. Anomalous Variation of Excited-State Proton Transfer Dynamics inside a Triblock Copolymer–Cationic Surfactant Mixed Micelle. J Phys Chem B 2019; 123:8559-8568. [DOI: 10.1021/acs.jpcb.9b06575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Tapas Pal
- 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
|
7
|
Yadav N, Chowdhury PK, Ganguli AK. Mechanistic Insights into the Growth of Anisotropic Nanostructures Inside Reverse Micelles: A Solvation Perspective. J Phys Chem B 2019; 123:5324-5336. [PMID: 31242745 DOI: 10.1021/acs.jpcb.9b02459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Reverse micelles (RMs) as soft templates have been successfully used in tailoring the structural characteristics (size and morphology) of nanomaterials that in turn have been used in various applications. In this work, we have focused on the local perturbations in the different interior domains of the cetyltrimethylammonium bromide-reverse micelle-based soft template en route to nanorod formation by monitoring the solvation response of coumarin-based solvatochromic probes (C343 and C153). We have observed an appreciable retardation of the solvent coordinate during the initial phases of nanorod growth, which we have attributed to the reorientational motion of the water molecules lodged in the interfacial region. Moreover, these rigid nanostructures leave their imprints on the soft interfacial layer as was observed from the direct correlation in the solvation response of RM-containing nanostructures and respective surfactant aggregates in supernatant solution. Supporting data from time-resolved anisotropy studies further reinforced our conclusions from the solvation experiments. Our study proves that the hydration dynamics can be a promising tool in tracking the heterogeneous growth evolution of nanostructure formation in RMs since solvent reorganization provides insights into the intrinsic, molecular-level features of the micellar assemblies.
Collapse
Affiliation(s)
- Nitin Yadav
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
| | - Pramit K Chowdhury
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
| | - Ashok K Ganguli
- Department of Chemistry , Indian Institute of Technology , Hauz Khas, New Delhi 110016 , India
| |
Collapse
|
8
|
Tarif E, Saha B, Mukherjee K, De P, Biswas R. Exploring Aqueous Solution Dynamics of an Amphiphilic Diblock Copolymer: Dielectric Relaxation and Time-Resolved Fluorescence Measurements. J Phys Chem B 2019; 123:5892-5901. [DOI: 10.1021/acs.jpcb.9b00889] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ejaj Tarif
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Biswajit Saha
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Kallol Mukherjee
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| | - Priyadarsi De
- Polymer Research Centre and Centre for Advanced Functional Materials, Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, West Bengal, India
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences (CBMS), S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake, Kolkata 700106, India
| |
Collapse
|
9
|
Xue Y, Sun J, Xiong S, Chai H, Xin X, Xu G, Liu T. Effect of block sequence of hyperbranched block copolymers on the aggregation behavior, drug solubilization and release property. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.080] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
10
|
Dutta R, Ghosh M, Pyne A, Sarkar N. Insight into the Dynamics of Different Fluorophores in the Interior of Aerosol OT Lamellar Structures in the Presence of Sugars: From Picosecond-to-Femtosecond Study. J Phys Chem B 2018; 123:117-129. [DOI: 10.1021/acs.jpcb.8b10609] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rupam Dutta
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Meghna Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Arghajit Pyne
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| |
Collapse
|
11
|
Butakov A, Filippov A, Gimatdinov R, Chernov V. Peculiarities of NMR relaxation in micellar gels of Pluronic F-127. J DISPER SCI TECHNOL 2018. [DOI: 10.1080/01932691.2018.1470532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Anatoly Butakov
- Radiophysics and Electronics, Chelyabinsk State University, Chelyabinsk, Russia
| | - Andrei Filippov
- Chemistry of Interfaces, Luleå University of Technology, Luleå, Sweden
- Institute of Physics, Kazan Federal University, Kazan, Russia
| | | | - Vladimir Chernov
- Radiophysics and Electronics, Chelyabinsk State University, Chelyabinsk, Russia
| |
Collapse
|
12
|
Solvation dynamics in SDS micelle revisited with femtosecond time resolution to reveal the probe and concentration dependence. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.07.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
13
|
Nandi S, Parui S, Jana B, Bhattacharyya K. Local environment of organic dyes in an ionic liquid-water mixture: FCS and MD simulation. J Chem Phys 2018; 149:054501. [DOI: 10.1063/1.5027458] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Somen Nandi
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sridip Parui
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Biman Jana
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462066, Madhya Pradesh, India
| |
Collapse
|
14
|
Synthesis, aggregation behavior, and simvastatin solubilization by block polyethers with different structures. Colloid Polym Sci 2018. [DOI: 10.1007/s00396-018-4341-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
15
|
Das I, Halder M. A Global Scenario on the Dynamics of Excited State Proton Transfer of Pyranine in the Mixed Micellar Assemblies: Role of Water Accessibility in the Probe Location+. ChemistrySelect 2018. [DOI: 10.1002/slct.201800361] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ishita Das
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 INDIA
| | - Mintu Halder
- Department of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur-721302 INDIA
| |
Collapse
|
16
|
Xue Y, Sun J, Xiong S, Liu T, Xin X, Xu G. Synthesis, self-assembly and drug solubilization of hyperbranched block polyethers. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
17
|
Rakshit S, Sarkar A, Bhattacharya SC. A differential approach towards understanding the enhanced emission induced superior bio-imaging and cytotoxicity within block copolymeric nanomicelles. Colloids Surf B Biointerfaces 2017; 155:390-398. [DOI: 10.1016/j.colsurfb.2017.04.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 04/16/2017] [Accepted: 04/17/2017] [Indexed: 10/19/2022]
|
18
|
Zhang M, Levaray N, Daniel JR, Waldron KC, Zhu X. Cholic acid dimers as invertible amphiphilic pockets: synthesis, molecular modeling, and inclusion studies. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0621] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two dimers of cholic acid were synthesized through simple covalent linkers. The dimers form invertible molecular pockets in media of different polarity; hydrophobic pockets are formed in water and hydrophilic pockets are formed in organic media. Fluorescence studies show that pockets formed by these dimers can serve as invertible hosts for the hydrophobic guest pyrene and the hydrophilic guest coumarin 343. The molecular pocket also enhances dissolution of the weakly soluble cresol red sodium salt in organic media. Molecular modeling was performed to better understand the host–guest complexation process of the invertible amphiphilic pockets. The calculated free energy changes indicate that the two dimers form the most stable complexes with coumarin 343 at a host to guest ratio of 2:2, whereas the host to guest ratio differs in the formation of complexes with pyrene for the two dimers. The dimer with the shorter, less flexible linker seems to form host–guest complexes that are more stable in both water and organic solvents.
Collapse
Affiliation(s)
- Meng Zhang
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Nicolas Levaray
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Josée R. Daniel
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Karen C. Waldron
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| | - X.X. Zhu
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
- Department of Chemistry, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, QC H3C 3J7, Canada
| |
Collapse
|
19
|
Gerola AP, de Morais FAP, Costa PFA, Kimura E, Caetano W, Hioka N. Characterization of chlorophyll derivatives in micelles of polymeric surfactants aiming photodynamic applications. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:213-221. [PMID: 27665188 DOI: 10.1016/j.saa.2016.09.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 09/06/2016] [Accepted: 09/17/2016] [Indexed: 05/20/2023]
Abstract
The spectrophotometric properties of chlorophylls' derivatives (Chls) formulated in the Pluronics® F-127 and P-123 were evaluated and the results have shown that the Chls were efficiently solubilized in these drug delivery systems as monomers. The relative location of the Chls in the Pluronics® was estimated from the Stokes shift and micropolarity of the micellar environment. Chls with phytyl chain were located in the micellar core, where the micropolarity is similar to ethanol, while phorbides' derivatives (without phytyl chain) were located in the outer shell of the micelle, i.e., more polar environment. In addition, the thermal stability of the micellar formulations was evaluated through electronic absorption, fluorescence emission and resonance light scattering with lowering the temperature. The Chls promote the stability of the micelles at temperatures below the Critical Micellar Temperature (CMT) of these surfactants. For F-127 formulations, the water molecules drive through inside the nano-structure at temperatures below the CMT, which increased the polarity of this microenvironment and directly affected the spectrophotometric properties of the Chls with phytyl chain. The properties of the micellar microenvironment of P-123, with more hydrophobic core due to the small PEO/PPO fraction, were less affected by lowering the temperature than for F-127. These results enable us to better understand the Chls behavior in micellar copolymers and allowed us to design new drug delivery system that maintains the photosensitizer's properties for photodynamic applications.
Collapse
Affiliation(s)
- Adriana Passarella Gerola
- Department of Chemistry, Universidade Estadual de Maringá, Av. Colombo 5.790, 87020-900 Maringá, PR, Brazil
| | | | - Paulo Fernando A Costa
- Department of Chemistry, Universidade Estadual de Maringá, Av. Colombo 5.790, 87020-900 Maringá, PR, Brazil
| | - Elza Kimura
- Department of Pharmacy, Universidade Estadual de Maringá, Av. Colombo 5.790, 87020-900 Maringá, PR, Brazil
| | - Wilker Caetano
- Department of Chemistry, Universidade Estadual de Maringá, Av. Colombo 5.790, 87020-900 Maringá, PR, Brazil
| | - Noboru Hioka
- Department of Chemistry, Universidade Estadual de Maringá, Av. Colombo 5.790, 87020-900 Maringá, PR, Brazil.
| |
Collapse
|
20
|
Antonisamy JD, Swain J, Dash S. Study on binding and fluorescence energy transfer efficiency of Rhodamine B with Pluronic F127-gold nanohybrid using optical spectroscopy methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:139-143. [PMID: 27623351 DOI: 10.1016/j.saa.2016.09.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 09/01/2016] [Accepted: 09/01/2016] [Indexed: 06/06/2023]
Abstract
This work focuses on the binding efficiency and fluorescence resonance energy transfer (FRET) of fluorescent dye Rhodamine B (Rh B) to Pluronic F127-gold nanohybrid. The formation of gold nanoparticles inside Rh B doped Pluronic F127 copolymer have been characterized using dynamic light scattering study, HR-TEM images, UV-visible spectra and fluorescence studies. Fluorescence quenching and the constant fluorescence lifetime of the Rhodamine B present in the cavity of Pluronic F127-gold nanohybrid suggested a strong binding ability (3.5×103Lmol-1), static nature of quenching and better energy transfer efficiency of fluorescent dye towards Pluronic F127-gold (Au) nanohybrids.
Collapse
Affiliation(s)
| | - Jitendriya Swain
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India
| | - Sasmita Dash
- Department of Chemistry, Annamalai University, Chidambaram 608002, India.
| |
Collapse
|
21
|
Ghosh S, Bhattacharyya K. Single-molecule Spectroscopy: Exploring Heterogeneity in Chemical and Biological Systems. CHEM REC 2016; 16:601-13. [DOI: 10.1002/tcr.201500214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Shirsendu Ghosh
- Department of Physical Chemistry; Indian Association for the Cultivation of Science; 2A and 2B, Raja Subodh Chandra Mullick Rd Jadavpur, Kolkata West Bengal 700032 India
| | - Kankan Bhattacharyya
- Department of Physical Chemistry; Indian Association for the Cultivation of Science; 2A and 2B, Raja Subodh Chandra Mullick Rd Jadavpur, Kolkata West Bengal 700032 India
| |
Collapse
|
22
|
Soumya S, Seth S, Paul S, Samanta A. Contrasting Response of Two Dipolar Fluorescence Probes in a Leucine-Based Organogel and Its Implications. Chemphyschem 2015; 16:2440-6. [PMID: 26073751 DOI: 10.1002/cphc.201500316] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Indexed: 11/09/2022]
Abstract
The microenvironments of a leucine-based organogel are probed by monitoring the fluorescence behavior of coumarin 153 (C153) and 4-aminophthalimide (AP). The steady-state data reveals distinctly different locations of the two molecules in the gel. Whereas AP resides close to the hydroxyl moieties of the gelator and engages in hydrogen-bonding interactions, C153 is found in bulk-toluene-like regions. In contrast to C153, AP exhibits excitation-wavelength-dependent emission, indicating that the environments of the hydrogen-bonded AP molecules are not all identical. A two-component fluorescence decay of AP in gel, unlike C153, supports this model. A time-resolved fluorescence anisotropy study of the rotational motion of the molecules also reveals the strong association of only AP with the gelator. That AP influences the critical gelation concentration implies its direct involvement in the gel-formation process. The results highlight the importance of guest-gelator interactions in gels containing guest molecules.
Collapse
Affiliation(s)
- Sivalingam Soumya
- School of Chemistry, University of Hyderabad, Hyderabad 500046 (India)
| | - Sudipta Seth
- School of Chemistry, University of Hyderabad, Hyderabad 500046 (India)
| | - Sneha Paul
- School of Chemistry, University of Hyderabad, Hyderabad 500046 (India)
| | - Anunay Samanta
- School of Chemistry, University of Hyderabad, Hyderabad 500046 (India).
| |
Collapse
|
23
|
Verma P, Pal H. Tuning of electron transfer reactions in pluronic-surfactant supramolecular assemblies. Phys Chem Chem Phys 2015; 17:15400-11. [PMID: 26006183 DOI: 10.1039/c5cp01480h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photoinduced electron transfer (ET) reaction between an anionic acceptor, coumarin-343 (C343), and a neutral donor, N,N-dimethylaniline (DMAN), has been investigated in composite supramolecular assemblies (mixed micelles) comprised of a pluronic copolymer (P123: EO20-PO70-EO20 or F88: EO103-PO39-EO103 where EO: ethylene oxide and PO: propylene oxide) and a cationic surfactant (CTAC: cetyltrimethylammonium chloride), following fluorescence quenching studies. Systematic increase in the quenching rates for the studied donor-acceptor system with the increasing CTAC to pluronic molar ratio in the mixed micelles demonstrates a large modulation in the ET rates. The mixed micellar systems in the present cases are formed through the incorporation of the hydrocarbon chains of CTAC into the poly-PO core of the pluronic micelles whereby the cationic head groups of CTAC are placed at the periphery of the micellar core, protruded into the hydrated poly-EO corona region, leading to the formation of a positively charged layer deep inside these mixed micelles. Thus, the anionic C343 dye, initially dissolved at the micelle-water interface, experiences a gradually increasing electrostatic attraction and is therefore systematically dragged deeper inside the micellar corona, as the CTAC composition is increased in the mixed micellar systems. Consequently, the ET rate of the C343-DMAN pair undergoes a large enhancement in the studied mixed micellar systems with the increasing CTAC to pluronic molar ratio. The present strategy of modulating ET reactions using such composite supramolecular assemblies can find applications in areas where bimolecular ET is an integral reaction step.
Collapse
Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
| | | |
Collapse
|
24
|
Dandapat M, Mandal D. Time-dependent fluorescence Stokes shift and molecular-scale dynamics in alginate solutions and hydrogels. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.03.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
25
|
Li G, Hao J, Li H, Fan D, Sui W. Determination of the critical micellar temperature of F127 aqueous solutions at the presence of sodium bromide by cyclic voltammetry. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-014-3461-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
26
|
Roy A, Kundu N, Banik D, Kuchlyan J, Sarkar N. How does bile salt penetration affect the self-assembled architecture of pluronic P123 micelles? – light scattering and spectroscopic investigations. Phys Chem Chem Phys 2015; 17:19977-90. [DOI: 10.1039/c5cp02296g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The triblock copolymer of the type (PEO)20–(PPO)70–(PEO)20 (P123) forms a mixed supramolecular aggregate with different bile salts, sodium deoxycholate (NaDC) and sodium taurocholate (NaTC), having different hydrophobicity.
Collapse
Affiliation(s)
- Arpita Roy
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Niloy Kundu
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Debasis Banik
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Jagannath Kuchlyan
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| | - Nilmoni Sarkar
- Department of Chemistry
- Indian Institute of Technology
- Kharagpur 721302
- India
| |
Collapse
|
27
|
Elistratova J, Burilov V, Mustafina A, Konovalov A. Response of Tb(III) and Eu(III) centered luminescence on phase transitions in aqueous solutions of triblock copolymers. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.06.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
28
|
Prabhu SR, Dutt GB. Solute dynamics in block-copolymer reverse micelles: do water content and copolymer concentration alter the microenvironment? J Chem Phys 2014; 140:234905. [PMID: 24952566 DOI: 10.1063/1.4882905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Solute dynamics has been explored in reverse micelles formed with the triblock copolymer (EO)13-(PO)30-(EO)13 (L64), where EO and PO represent ethylene oxide and propylene oxide units, respectively, with small amounts of water in p-xylene. To this effect, nonradiative rate constants (knr) and reorientation times (τr) of two carbocyanine derivatives, 3,3'-diethyloxadicarbocyanine iodide (DODCI) and merocyanine 540 (MC 540) have been measured at different mole ratios of water to copolymer (W) and also at three copolymer concentrations. By examining the nonradiative rate constants and the reorientation times of the two solutes, the microenvironment offered by L64/water/p-xylene reverse micellar system has been investigated. It has been observed that there is no variation in the nonradiative rate constants as well as in the reorientation times of both DODCI and MC 540 with an increase in W and [L64]. Since knr represents activated twist motion about the double bonds for these solutes, it is sensitive to the local friction and likewise, τr also provides information about the microenvironment. Thus, the results of this study indicate that DODCI and MC 540 are located in the cores of the L64 reverse micelles that are made up of hydrated ethylene oxide blocks and the hydration levels are not altered despite an increase in the water content and copolymer concentration. In other words, there is no variation in the microenvironment offered by L64/water/p-xylene reverse micellar system upon increasing W and [L64].
Collapse
Affiliation(s)
- Sugosh R Prabhu
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - G B Dutt
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
29
|
Maiti C, Dey D, Mandal S, Dhara D. Thermoregulated Formation and Disintegration of Cationic Block Copolymer Vesicles: Fluorescence Resonance Energy Transfer Study. J Phys Chem B 2014; 118:2274-83. [PMID: 24490812 DOI: 10.1021/jp412273h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Chiranjit Maiti
- Department of Chemistry, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Debabrata Dey
- Department of Chemistry, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Dibakar Dhara
- Department of Chemistry, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| |
Collapse
|
30
|
Anand U, Mukherjee S. Microheterogeneity and microviscosity of F127 micelle: the counter effects of urea and temperature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1012-1021. [PMID: 24410288 DOI: 10.1021/la4049192] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
F127 is the most widely studied triblock copolymer and due to the presence of very long polypropylene oxide (PPO) and polyethylene oxide (PEO) groups, F127 micelle has different microenvironments clearly separated into core, corona, and peripheral regions. Urea has been known to have adverse effects on the micellar properties and causes demicellization and solvation; on the other hand, rise in temperature causes micellization and solvent evacuation from the core and corona regions. In the present study, we have investigated the microheterogeneity of the core, corona, and peripheral regions of the F127 micelle using red edge excitation shift (REES) at different temperatures and urea concentrations and correlated the effect of both on the micellar system. It was found that the temperature counteracts the effect of urea and also that the counteraction is more prominent in the core region with respect to corona, and the peripheral region is least affected. Also, the core and corona regions are very much heterogeneous, while the peripheral region is more of a homogeneous nature. Using time-resolved fluorescence anisotropy, we found that the microviscosity within the micelles vary in the order of core > corona > peripheral region, and urea has a general tendency to reduce the microviscosity, especially for core and corona regions. On the other hand, rise in temperature initially increases and then decreases the microviscosity throughout, and at elevated temperatures the effect of urea is being dominated by the effect of temperature, thereby establishing the counter effects of temperature and urea on the F127 micellar system.
Collapse
Affiliation(s)
- Uttam Anand
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal , Indore By-Pass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | | |
Collapse
|
31
|
Sonu, Tiwari AK, Kumari S, Saha SK. Study on intramolecular charge transfer processes, solvation dynamics and rotational relaxation of coumarin 490 in reverse micelles of cationic gemini surfactant. RSC Adv 2014. [DOI: 10.1039/c4ra02708f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
32
|
De D, Sajjan M, Datta A. Anisotropic dynamics of guest molecules in aerosol OT lamellar structures. Phys Chem Chem Phys 2013; 15:19724-9. [PMID: 24135714 DOI: 10.1039/c3cp52372a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The present work is focused on developing a description of an anisotropic microheterogeneous medium, exploiting the dynamics of a guest molecule. The medium in question is the lamellar structures formed in the aqueous layer of ternary mixtures containing aerosol OT (AOT), water and n-heptane. The guest used in this study is the fluorescent probe, coumarin 153 (C153). The dynamics of this molecule, within the lamellar structure, have been studied using a combination of steady state and time resolved fluorescence, as well as fluorescence correlation spectroscopy (FCS). The fluorophore is strongly solvatochromatic and so, the wavelength of excitation can be tuned so as to selectively excite fluorescent molecules residing in different regions of the microheterogeneous media, even if the spatial separation between these regions is below the diffraction limit. The excitation wavelength in the present experiments is chosen so as to exclusively excite those C153 molecules that reside in the hydrophobic region of the lamellar structures. This triggers two different modes of diffusion, one along and the other perpendicular to the bilayers of the AOT. Thus, the dynamics of the fluorescent probe provide an elegant manifestation of the anisotropy of the host medium.
Collapse
Affiliation(s)
- Dipanwita De
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India.
| | | | | |
Collapse
|
33
|
Is it possible to apply dynamics of solvent to locate metal nanoparticles inside an ionic liquids-containing microheterogeneous system? A comparative study. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.06.058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
34
|
Viger ML, Sheng W, McFearin CL, Berezin MY, Almutairi A. Application of time-resolved fluorescence for direct and continuous probing of release from polymeric delivery vehicles. J Control Release 2013; 171:308-14. [PMID: 23792808 DOI: 10.1016/j.jconrel.2013.06.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Revised: 06/03/2013] [Accepted: 06/10/2013] [Indexed: 12/30/2022]
Abstract
Though accurately evaluating the kinetics of release is critical for validating newly designed therapeutic carriers for in vivo applications, few methods yet exist for release measurement in real time and without the need for any sample preparation. Many of the current approaches (e.g. chromatographic methods, absorption spectroscopy, or NMR spectroscopy) rely on isolation of the released material from the loaded vehicles, which require additional sample purification and can lead to loss of accuracy when probing fast kinetics of release. In this study we describe the use of time-resolved fluorescence for in situ monitoring of small molecule release kinetics from biodegradable polymeric drug delivery systems. This method relies on the observation that fluorescent reporters being released from polymeric drug delivery systems possess distinct excited-state lifetime components, reflecting their different environments in the particle suspensions, i.e., confined in the polymer matrices or free in the aqueous environment. These distinct lifetimes enable real-time quantitative mapping of the relative concentrations of dye in each population to obtain precise and accurate temporal information on the release profile of particular carrier/payload combinations. We found that fluorescence lifetime better distinguishes subtle differences in release profiles (e.g. differences associated with dye loading) than conventional steady-state fluorescence measurements, which represent the averaged dye behavior over the entire scan. Given the method's applicability to both hydrophobic and hydrophilic cargo, it could be employed to model the release of any drug-carrier combination.
Collapse
Affiliation(s)
- Mathieu L Viger
- School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, 92093, USA
| | | | | | | | | |
Collapse
|
35
|
A fluorescence study on the local environment of hydrogels: Double-network hydrogels having extraordinarily high mechanical strength and its constituent single-network hydrogels. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.02.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
36
|
Prabhu SR, Dutt GB. Can Critical Packing Parameter Depict Probe Rotation in Block-Copolymer Reverse Micelles? J Phys Chem B 2013; 117:5868-74. [DOI: 10.1021/jp4022807] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Sugosh R. Prabhu
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - G. B. Dutt
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
37
|
Spectral properties of coumarin derivatives in various environments. OPEN CHEM 2013. [DOI: 10.2478/s11532-012-0185-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractThe structural and spectral properties of coumarin derivatives in complex environments were investigated within the time-dependent density functional theory (TD DFT). Absorption spectra calculations were obtained at TD PBE0/6-31+G(d,p) level of theory for coumarin47 in the gas-phase and in various polar and non-polar organic solvents. The geometries of coumarins 6, 30, 47 and 522 in the gas phase and in inclusion complexes with the β-cyclodextrin (βCD) were determined by PM3 and DFT (HCTH/6-31G) calculations. Encapsulation of coumarin in βCD and associated changes in electronic structure produced either a red or blue shift in the absorption spectra of coumarins. A proposed cavity model for βCD-coumarin complex in water solution allowed identification of various contributions to the overall shift in the absorption spectra of coumarin upon complex formation in a solvent environment
Collapse
|
38
|
Magniez K, Voda AS, Kafi AA, Fichini A, Guo Q, Fox BL. Overcoming interfacial affinity issues in natural fiber reinforced polylactide biocomposites by surface adsorption of amphiphilic block copolymers. ACS APPLIED MATERIALS & INTERFACES 2013; 5:276-283. [PMID: 23256548 DOI: 10.1021/am302013p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This work demonstrates that the interfacial properties in a natural fiber reinforced polylactide bio-composite can be tailored through surface adsorption of amphiphilic and biodegradable poly (ethylene glycol)-b-poly(l-lactide) (PEG-PLLA) block copolymers. The deposition from solvent solution of PEG-PLLA copolymers onto the fibrous substrate induced distinct mechanisms of molecular organization at the cellulosic interface, which are correlated to the hydrophobic/hydrophilic ratios and the type of solvent used. The findings of the study evidenced that the performance of the corresponding biocomposites with polylactide were effectively enhanced by using these copolymers as interfacial coupling agents. During the fabrication stage, diffusion of the polylactide in the melt induced a change in the environment surrounding block copolymers which became hydrophobic. It is proposed that molecular reorganization of the block copolymers at the interface occurred, which favored the interactions with both the hydrophilic fibers and hydrophobic polylactide matrix. The strong interactions such as intra- and intermolecular hydrogen bonds formed across the fiber-matrix interface can be accounted for the enhancement in properties displayed by the biocomposites. Although the results reported here are confined, this concept is unique as it shows that by tuning the amphiphilicity and the type of building blocks, it is possible to control the surface properties of the substrate by self-assembly and disassembly of the amphiphiles for functional materials.
Collapse
Affiliation(s)
- Kevin Magniez
- Institute for Frontier Materials, Deakin University, Victoria, Waurn Ponds, 3217, Australia.
| | | | | | | | | | | |
Collapse
|
39
|
Taguchi S, Ichikawa T, Kato T, Ohno H. Design and evaluation of nano-biphasic ionic liquid systems having highly polar and low polar domains. RSC Adv 2013. [DOI: 10.1039/c3ra43876g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
40
|
Verma P, Pal H. Intriguing H-Aggregate and H-Dimer Formation of Coumarin-481 Dye in Aqueous Solution As Evidenced from Photophysical Studies. J Phys Chem A 2012; 116:4473-84. [DOI: 10.1021/jp210433f] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Haridas Pal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| |
Collapse
|
41
|
Ghosh S, Mandal AK, Das AK, Mondal T, Bhattacharyya K. Diffusion of organic dyes in a niosome immobilized on a glass surface using fluorescence correlation spectroscopy. Phys Chem Chem Phys 2012; 14:9749-57. [DOI: 10.1039/c2cp41212h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
42
|
Wang G, Geng J, Zhang X, Cai L, Ding D, Li K, Wang L, Lai YH, Liu B. Pyrene-based water dispersible orange emitter for one- and two-photon fluorescence cellular imaging. Polym Chem 2012. [DOI: 10.1039/c2py20271a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
43
|
Zhang L, Yin Q, Su J, Wu Q. Local Polarity and Microviscosity of the Interior of Dendritic Polyethylene Amphiphiles. Macromolecules 2011. [DOI: 10.1021/ma2013089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ling Zhang
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Qihe Yin
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Jing Su
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| | - Qing Wu
- DSAPM Lab, School of Chemistry and Chemical Engineering, and PCFM Lab, OFCM Institute, Sun Yat-Sen University, Guangzhou 510275, China
| |
Collapse
|
44
|
|
45
|
Natarajan B, Gupta S, Ramamurthy V, Jayaraman N. Interfacial Regions Governing Internal Cavities of Dendrimers. Studies of Poly(alkyl aryl ether) Dendrimers Constituted with Linkers of Varying Alkyl Chain Length. J Org Chem 2011; 76:4018-26. [DOI: 10.1021/jo200464g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Baskar Natarajan
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560118, India
| | - Shipra Gupta
- Department of Chemistry, University of Miami, Coral Gables, Florida 33124, United States
| | | | | |
Collapse
|
46
|
Shiraishi Y, Inoue T, Hirai T. Local viscosity analysis of triblock copolymer micelle with cyanine dyes as a fluorescent probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17505-17512. [PMID: 20942435 DOI: 10.1021/la1028993] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The local viscosity of Pluronic F127 triblock copolymer micelles in water was determined with cyanine dyes as fluorescent probes. These dyes show very weak fluorescence at a low temperature, but show enhanced fluorescence at a temperature higher than the critical micellization temperature (T(cm)). This is because a viscous environment within the micelle suppresses the formation of a nonradiative twisted intramolecular charge transfer (TICT) excited state of the dyes. The good correlation between the fluorescence quantum yields of the dyes and the viscosity and the temperature of the media allows a determination of local viscosity of micelle based on the fluorescence quantum yields. The local viscosity of both core and corona regions of micelles increases at >T(cm) and shows a maximum at a temperature 7-9 °C higher than T(cm), and decreases at higher temperature due to the increased fluidity. The core viscosity is larger than that of the corona, and the corona viscosity increases toward the micelle center. The polymer concentration has different effects on the core and corona viscosity: the corona viscosity increases with a polymer concentration increase at the entire temperature range, whereas the core viscosity increases only at a low temperature. The corona viscosity increase is due to the condensation of a large number of polyethylene oxide (PEO) blocks. In contrast, the dehydration degree of polypropylene oxide (PPO) blocks in the core scarcely changes, and the core has a similar composition regardless of polymer concentration. The larger polymer concentration promotes a micelle formation at lower temperature where the fluidity increase is very weak, resulting in larger core viscosity.
Collapse
Affiliation(s)
- Yasuhiro Shiraishi
- Research Center for Solar Energy Chemistry and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.
| | | | | |
Collapse
|
47
|
Causse J, Oberdisse J, Jestin J, Lagerge S. Small-angle neutron scattering study of solubilization of tributyl phosphate in aqueous solutions of L64 Pluronic triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15745-15753. [PMID: 20873831 DOI: 10.1021/la1021164] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have studied the solubilization behavior of tributylphosphate (TBP) in aqueous solutions of L64-Pluronics, using light and small angle neutron scattering (SANS). Varying the temperature and the oil content, the system presents a nontrivial phase behavior. In particular, at 308 K, a first solubilization followed by an emulsification failure and a resolubilization is found. We have measured the microstructure by SANS and characterized the microemulsion droplet core size, corona thickness, polydispersity, and interactions. It is shown that at low oil content, the system is made of small swollen micelles. After the phase separation, the resolubilization is carried by larger oil droplets decorated by copolymer. From specific surface measurements at large angles, a surprising change in surfactant conformation is found to accompany this morphological evolution which is also supported by previous results obtained from ¹H NMR experiments. In independent measurements, our structural modeling is confirmed using contrast-variation SANS.
Collapse
Affiliation(s)
- J Causse
- Institut Charles Gerhardt CNRS UMR-5253 équipe Agrégats Interfaces Matériaux pour l'Energie, Université Montpellier II, Case 015, Place E. Bataillon, 34095 Montpellier Cedex 05, France
| | | | | | | |
Collapse
|
48
|
Aliaga C, Briones L, Rezende MC, Tirapegui C. The thermochromism of the ET(30) betaine in a micro-heterogeneous medium: A spectral and dynamics simulation study. J Colloid Interface Sci 2010; 349:565-70. [DOI: 10.1016/j.jcis.2010.05.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Revised: 05/25/2010] [Accepted: 05/27/2010] [Indexed: 10/19/2022]
|
49
|
Beija M, Fedorov A, Charreyre MT, Martinho JMG. Fluorescence Anisotropy of Hydrophobic Probes in Poly(N-decylacrylamide)-block-poly(N,N-diethylacrylamide) Block Copolymer Aqueous Solutions: Evidence of Premicellar Aggregates. J Phys Chem B 2010; 114:9977-86. [DOI: 10.1021/jp101613y] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Mariana Beija
- Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal, and Unité Mixte CNRS-bioMérieux, École Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Aleksander Fedorov
- Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal, and Unité Mixte CNRS-bioMérieux, École Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Marie-Thérèse Charreyre
- Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal, and Unité Mixte CNRS-bioMérieux, École Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - José M. G. Martinho
- Centro de Química-Física Molecular and IN - Institute of Nanoscience and Nanotechnology, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal, and Unité Mixte CNRS-bioMérieux, École Normale Supérieure de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| |
Collapse
|
50
|
Singh PK, Kumbhakar M, Ganguly R, Aswal VK, Pal H, Nath S. Time-Resolved Fluorescence and Small Angle Neutron Scattering Study in Pluronics−Surfactant Supramolecular Assemblies. J Phys Chem B 2010; 114:3818-26. [DOI: 10.1021/jp909333q] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Prabhat K. Singh
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Rajib Ganguly
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Vinod K. Aswal
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Chemistry Division, and Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| |
Collapse
|