1
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Vogelaar T, Szostak SM, Lund R. Coacervation in Slow Motion: Kinetics of Complex Micelle Formation Induced by the Hydrolysis of an Antibiotic Prodrug. Mol Pharm 2024; 21:4157-4168. [PMID: 39011839 PMCID: PMC11304390 DOI: 10.1021/acs.molpharmaceut.4c00579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2024] [Revised: 07/04/2024] [Accepted: 07/05/2024] [Indexed: 07/17/2024]
Abstract
Colistin methanesulfonate (CMS) is the less-toxic prodrug of highly nephrotoxic colistin. To develop and understand highly necessary new antibiotic formulations, the hydrolysis of CMS to colistin must be better understood. Herein, with the addition of poly(ethylene oxide)-b-poly(methacrylic acid) (PEO-b-PMAA) to CMS, we show that we can follow the hydrolysis kinetics, employing small-angle X-ray scattering (SAXS) through complex coacervation. During this hydrolysis, hydroxy methanesulfonate (HMS) groups from CMS are cleaved, while the newly formed cationic amino groups complex with the anionic charge from the PMAA block. As the hydrolysis of HMS groups is slow, we can follow the complex coacervation process by the gradual formation of complex micelles containing activated antibiotics. Combining mass spectrometry (MS) with SAXS, we quantify the hydrolysis as a function of pH. Upon modeling the kinetic pathways, we found that complexation only happens after complete hydrolysis into colistin and that the process is accelerated under acidic conditions. At pH = 5.0, effective charge switching was identified as the slowest step in the CMS conversion, constituting the rate-limiting step in colistin formation.
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Affiliation(s)
- Thomas
D. Vogelaar
- Department
of Chemistry, University of Oslo, P.O. Box 1033 Blindern, Oslo NO-0315, Norway
| | - Szymon M. Szostak
- Department
of Chemistry, University of Oslo, P.O. Box 1033 Blindern, Oslo NO-0315, Norway
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, P.O. Box 1033 Blindern, Oslo NO-0315, Norway
- Hylleraas
Centre for Quantum Molecular Sciences, University
of Oslo, Oslo NO-0315, Norway
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2
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Vogelaar T, Agger AE, Reseland JE, Linke D, Jenssen H, Lund R. Crafting Stable Antibiotic Nanoparticles via Complex Coacervation of Colistin with Block Copolymers. Biomacromolecules 2024; 25:4267-4280. [PMID: 38886154 PMCID: PMC11238337 DOI: 10.1021/acs.biomac.4c00337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 06/04/2024] [Accepted: 06/05/2024] [Indexed: 06/20/2024]
Abstract
To combat the ever-growing increase of multidrug-resistant (MDR) bacteria, action must be taken in the development of antibiotic formulations. Colistin, an effective antibiotic, was found to be nephrotoxic and neurotoxic, consequently leading to a ban on its use in the 1980s. A decade later, colistin use was revived and nowadays used as a last-resort treatment against Gram-negative bacterial infections, although highly regulated. If cytotoxicity issues can be resolved, colistin could be an effective option to combat MDR bacteria. Herein, we investigate the complexation of colistin with poly(ethylene oxide)-b-poly(methacrylic acid) (PEO-b-PMAA) block copolymers to form complex coacervate core micelles (C3Ms) to ultimately improve colistin use in therapeutics while maintaining its effectiveness. We show that well-defined and stable micelles can be formed in which the cationic colistin and anionic PMAA form the core while PEO forms a protecting shell. The resulting C3Ms are in a kinetically arrested and stable state, yet they can be made reproducibly using an appropriate experimental protocol. By characterization through dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS), we found that the best C3M formulation, based on long-term stability and complexation efficiency, is at charge-matching conditions. This nanoparticle formulation was compared to noncomplexed colistin on its antimicrobial properties, enzymatic degradation, serum protein binding, and cytotoxicity. The studies indicate that the antimicrobial properties and cytotoxicity of the colistin-C3Ms were maintained while protein binding was limited, and enzymatic degradation decreased after complexation. Since colistin-C3Ms were found to have an equal effectivity but with increased cargo protection, such nanoparticles are promising components for the antibiotic formulation toolbox.
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Affiliation(s)
- Thomas
D. Vogelaar
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
| | - Anne E. Agger
- Department
of Biomaterials, Institute of Clinical Dentistry, University of Oslo, P.O. Box 1109, Blindern, NO-0317 Oslo, Norway
| | - Janne E. Reseland
- Department
of Biomaterials, Institute of Clinical Dentistry, University of Oslo, P.O. Box 1109, Blindern, NO-0317 Oslo, Norway
| | - Dirk Linke
- Department
of Biosciences, University of Oslo, P.O. Box 1066, Blindern, NO-0316 Oslo, Norway
| | - Håvard Jenssen
- Department
of Science and Environment, Roskilde University, 4000 Roskilde, Denmark
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, NO-0315 Oslo, Norway
- Hylleraas
Centre for Quantum Molecular Sciences, University
of Oslo, NO-0315 Oslo, Norway
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3
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Fauquignon M, Porcar L, Brûlet A, Le Meins JF, Sandre O, Chapel JP, Schmutz M, Schatz C. In Situ Monitoring of Block Copolymer Self-Assembly via Solvent Exchange through Controlled Dialysis with Light and Neutron Scattering Detection. ACS Macro Lett 2023; 12:1272-1279. [PMID: 37671995 DOI: 10.1021/acsmacrolett.3c00286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
Solution self-assembly of amphiphilic block copolymers (BCs) is typically performed by a solvent-to-water exchange. However, BC assemblies are often trapped in metastable states depending on the mixing conditions such as the magnitude and rate of water addition. BC self-assembly can be performed under near thermodynamic control by dialysis, which accounts for a slow and gradual water addition. In this Letter we report the use of a specifically designed dialysis cell to continuously monitor by dynamic light scattering and small-angle neutron scattering the morphological changes of PDMS-b-PEG BCs self-assemblies during THF-to-water exchange. The complete phase diagrams of near-equilibrium structures can then be established. Spherical micelles first form before evolving to rod-like micelles and vesicles, decreasing the total developed interfacial area of self-assembled structures in response to increasing interfacial energy as the water content increases. The dialysis kinetics can be tailored to the time scale of BC self-assembly by modifying the membrane pore size, which is of interest to study the interplay between thermodynamics and kinetics in self-assembly pathways.
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Affiliation(s)
- Martin Fauquignon
- Université de Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Lionel Porcar
- Institut Laue-Langevin (ILL), F-38042 Grenoble, France
| | - Annie Brûlet
- Laboratoire Léon Brillouin, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA) Saclay, F-91191 Gif-sur-Yvette, France
| | | | - Olivier Sandre
- Université de Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
| | - Jean-Paul Chapel
- Centre de Recherche Paul Pascal (CRPP), UMR CNRS 5031, Université de Bordeaux, F-33600 Pessac, France
| | - Marc Schmutz
- Université de Strasbourg, CNRS, Institut Charles Sadron, UPR 22, F-67034 Strasbourg, France
| | - Christophe Schatz
- Université de Bordeaux, CNRS, Bordeaux INP, LCPO, UMR 5629, F-33600, Pessac, France
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4
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Larison T, Pingali SV, Stefik M. New approach for SANS measurement of micelle chain mixing during size and morphology transitions. SOFT MATTER 2023; 19:3487-3495. [PMID: 37133391 DOI: 10.1039/d3sm00157a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Chain exchange in amphiphilic block polymer micelles is measurable with time-resolved small-angle neutron scattering (TR-SANS) where contrast-matched conditions reveal chain mixing as reduced intensity. However, analyzing chain mixing on short time scales e.g. during micelle transformations remains challenging. SANS model fitting can quantify chain mixing during size and morphology changes, however short acquisition times lead to lower data statistics (higher error). Such data are unsuitable for form factor fitting, especially with polydisperse and/or multimodal scenarios. An integrated-reference approach, R(t), is compatible with such data by using fixed reference patterns for the unmixed and fully mixed states that are each integrated to improve data statistics (lower error). Although the R(t) approach is tolerant of low data statistics, it remains incompatible with size and morphology changes. A new shifting references relaxation approach, SRR(t), is proposed where reference patterns are acquired at each time point to enable mixed state calculations regardless of short acquisition times. The additional experimental measurements needed are described which provide these time-varying reference patterns. The use of reference patterns makes the SRR(t) approach size/morphology-agnostic, allowing for the extent of micelle mixing to be directly calculated without this knowledge. SRR(t) is thus compatible with arbitrary levels of complexity and can provide accurate assessment of the mixed state which could support future model analysis. Calculated scattering datasets were used to demonstrate the SRR(t) approach during multiple size, morphology, and solvent conditions (scenarios 1-3). The mixed state calculated from the SRR(t) approach is shown to be accurate for all three scenarios.
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Affiliation(s)
- Taylor Larison
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Sai Venkatesh Pingali
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Morgan Stefik
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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5
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Sato T. Kinetics of Micellization and Liquid-Liquid Phase Separation in Dilute Block Copolymer Solutions. Polymers (Basel) 2023; 15:polym15030708. [PMID: 36772009 PMCID: PMC9920675 DOI: 10.3390/polym15030708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 02/04/2023] Open
Abstract
A lattice theory for block copolymer solutions near the boundary between the micellization and liquid-liquid phase separation regions proposes a new kinetic process of micellization where small concentrated-phase droplets are first formed and then transformed into micelles in the early stage of micellization. Moreover, the thermodynamically stable concentrated phase formed from metastable micelles by a unique ripening process in the late stage of phase separation, where the growing concentrated-phase droplet size is proportional to the square root of the time.
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Affiliation(s)
- Takahiro Sato
- Osaka Study Center, The Open University of Japan, 4-9-23, Onohara-Higashi, Osaka 562-0031, Japan
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6
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Dial CF, Gemeinhart RA. Biophysical Characterization of Interactions between Serum Albumin and Block Copolymer Micelles. ACS Biomater Sci Eng 2022; 8:2899-2907. [PMID: 35767337 DOI: 10.1021/acsbiomaterials.2c00016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Block copolymer micelles have demonstrated great promise in the solubilization of hydrophobic drugs, but an understanding of the blood stability of the drug-laden micelles is needed for therapeutic advancement of micelle technologies. Following intravenous administration, mPEG-CL and mPEG-LA micelles have demonstrated quick release of their cargo and disassembly in blood, but the prevailing mechanisms of micelle disruption and key biomacromolecules driving this disruption have yet to be elucidated. Although protein interactions with solid polymeric nanoparticles have been characterized, not much is known regarding protein interactions with dynamic block copolymer micelles. Herein, we characterize the interaction of bovine and human serum albumins (BSA and HSA) with polymeric micelles, mPEG-CL and mPEG-LA, using protein fluorescence, isothermal titration calorimetry (ITC), and circular dichroism (CD) spectroscopy. We find that BSA and HSA have interactions with mPEG-CL, while only HSA is observed to weakly interact with mPEG-LA. Protein fluorescence suggests that binding of HSA to mPEG-CL and mPEG-LA is driven by electrostatic interactions. ITC suggests an interaction between serum albumin and mPEG-CL block copolymers driven by hydrogen bonding and electrostatic interactions in physiological MOPS-buffered saline, while mPEG-LA has no measurable interaction with either of the serum albumins. CD spectroscopy demonstrates that the protein secondary structure is intact in both proteins in the presence of mPEG-CL and mPEG-LA. Overall, BSA is not always predictive of polymeric interactions with HSA. Understanding of interactions between serum proteins and block copolymer micelles and the exact mechanisms of destabilization will direct the rational design of block copolymer systems for improving blood stability.
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Affiliation(s)
- Catherine F Dial
- Department of Pharmaceutical Sciences, University of Illinois Chicago, Chicago, Illinois 60612, United States
| | - Richard A Gemeinhart
- Department of Pharmaceutical Sciences, University of Illinois Chicago, Chicago, Illinois 60612, United States.,Department of Biomedical Engineering, University of Illinois Chicago, Chicago, Illinois 60607, United States.,Department of Chemical Engineering, University of Illinois Chicago, Chicago, Illinois 60607, United States.,Department of Ophthalmology and Visual Sciences, University of Illinois Chicago, Chicago, Illinois 60612, United States
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7
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Nielsen J, Lund R. Molecular Transport and Growth of Lipid Vesicles Exposed to Antimicrobial Peptides. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:374-384. [PMID: 34902242 PMCID: PMC8757467 DOI: 10.1021/acs.langmuir.1c02736] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 12/01/2021] [Indexed: 05/20/2023]
Abstract
It is well-known that lipids constituting the cytoplasmic membrane undergo continuous reorganization to maintain the appropriate composition important for the integrity of the cell. The transport of lipids is controlled by mainly membrane proteins, but also spontaneous lipid transport between leaflets, lipid "flip-flop", occurs. These processes do not only occur spontaneously under equilibrium, but also promote structural rearrangements, morphological transitions, and growth processes. It has previously been shown that intravesicular lipid "flip-flop" and intervesicular lipid exchange under equilibrium can be deduced indirectly from contrast variation time-resolved small-angle neutron scattering (TR-SANS) where the molecules are "tagged" using hydrogen/deuterium (H/D) substitution. In this work, we show that this technique can be extended to simultaneously detect changes in the growth and the lipid "flip-flop" and exchange rates induced by a peptide additive on lipid vesicles consisting of DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine), d-DMPC (1,2-dimyristoyl-d54-sn-glycero-3-phosphocholine), DMPG (1,2-dimyristoyl-sn-glycero-3-phospho-(1'-rac-glycerol)), and small amounts of DMPE-PEG (1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000]). Changes in the overall size were independently monitored using dynamic light scattering (DLS). We find that the antimicrobial peptide, indolicidin, accelerates lipid transport and additionally induces limited vesicular growth. Moreover, in TR-SANS experiments using partially labeled lipid mixtures to separately study the kinetics of the lipid components, we show that, whereas peptide addition affects both lipids similarly, DMPG exhibits faster kinetics. We find that vesicular growth is mainly associated with peptide-mediated lipid reorganization that only slightly affects the overall exchange kinetics. This is confirmed by a TR-SANS experiment of vesicles preincubated with peptide showing that after pre-equilibration the kinetics are only slightly slower.
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Affiliation(s)
| | - Reidar Lund
- Department of Chemistry, University of Oslo, Postboks 1033 Blindern, Oslo 0315, Norway
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8
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Rahmani A, Rahimi F, Iranshahi M, Kahroba H, Zarebkohan A, Talebi M, Salehi R, Mousavi HZ. Co-delivery of doxorubicin and conferone by novel pH-responsive β-cyclodextrin grafted micelles triggers apoptosis of metastatic human breast cancer cells. Sci Rep 2021; 11:21425. [PMID: 34728703 PMCID: PMC8563731 DOI: 10.1038/s41598-021-00954-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 10/05/2021] [Indexed: 11/29/2022] Open
Abstract
Adjuvant-aided combination chemotherapy is one of the most effective ways of cancer treatment by overcoming the multidrug resistance (MDR) and reducing the side-effects of anticancer drugs. In this study, Conferone (Conf) was used as an adjuvant in combination with Doxorubicin (Dox) for inducing apoptosis to MDA-MB-231 cells. Herein, the novel biodegradable amphiphilic β-cyclodextrin grafted poly maleate-co-PLGA was synthesized by thiol-ene addition and ring-opening process. Micelles obtained from the novel copolymer showed exceptional properties such as small size of around 34.5 nm, CMC of 0.1 μg/mL, and cell internalization of around 100% at 30 min. These novel engineered micelles were used for combination delivery of doxorubicin-conferone with high encapsulation efficiency of near 100% for both drugs. Our results show that combination delivery of Dox and Conf to MDA-MB-231 cells had synergistic effects (CI < 1). According to cell cycle and Annexin-V apoptosis analysis, Dox-Conf loaded micelle significantly induce tumor cell apoptosis (more than 98% of cells population showed apoptosis at IC50 = 0.259 μg/mL). RT-PCR and western-blot tests show that Dox-Conf loaded βCD-g-PMA-co-PLGA micelle induced apoptosis via intrinsic pathway. Therefore, the unique design of multi-functional pH-sensitive micelles open a new perspective for the development of nanomedicine for combination chemo-adjuvant therapy against malignant cancer.
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Affiliation(s)
- Akram Rahmani
- Department of Applied Chemistry, Faculty of Chemistry, Semnan University, Semnan, Iran
| | - Fariborz Rahimi
- Department of Electrical Engineering, University of Bonab, Bonab, Iran
| | - Mehrdad Iranshahi
- Faculty of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Houman Kahroba
- Molecular Medicine Research Center, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
- Department of Molecular Medicine, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amir Zarebkohan
- Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mehdi Talebi
- Department of Applied Cell Science, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Roya Salehi
- Drug Applied Research Center and Department of Medical Nanotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Hassan Zavvar Mousavi
- Department of Chemistry, Faculty of Science, University of Guilan, P.O. Box 41335-1914, Rasht, Iran.
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9
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Larison T, Stefik M. Persistent Micelle Corona Chemistry Enables Constant Micelle Core Size with Independent Control of Functionality and Polyelectrolyte Response. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9817-9825. [PMID: 34355919 DOI: 10.1021/acs.langmuir.1c01384] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Polymer micelles have found significant uses in areas such as drug/gene delivery, medical imaging, and as templates for nanomaterials. For many of these applications, the micelle performance depends on its size and chemical functionalization. To date, however, these parameters have often been fundamentally coupled since the equilibrium size of a micelle is a function of the chemical composition in addition to other parameters. Here, we demonstrate a novel processing pathway allowing for the chemical modification to the corona of kinetically trapped "persistent" polymer micelles, termed Persistent Micelle Corona Chemistry (PMCC). Judicious planning is crucial to this size-controlled functionalization where each step requires all reagents and polymer blocks to be compatible with (1) the desired chemistry, (2) micelle persistency, and (3) micelle dispersion. A desired functionalization can be implemented with PMCC by pairing the synthetic planning with polymer solubility databases. Specifically, poly(cyclohexyl methacrylate-b-(diethoxyphosphoryl)methyl methacrylate) (PCHMA-b-PDEPMMA) was prepared to combine a glassy-core block (PCHMA) for kinetic control with a block (PDEPMMA) that is able to be hydrolyzed to yield acid groups. The processing sequence determines the resulting micelle size distribution where the hydrolyzed-then-micellized sequence yields widely varying micelle dimensions due to equilibration. In contrast, the micellized-then-hydrolyzed sequence maintains kinetically trapped micelles throughout the PMCC process. Statistically significant transmission electron microscopy (TEM) measurements demonstrate that PMCC uniquely enables this functionalization with constant average micelle core dimensions. Furthermore, these kinetically trapped micelles also subsequently maintain constant micelle core size when modifying the Coulombic interactions of the micelle corona via pH changes.
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Affiliation(s)
- Taylor Larison
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Morgan Stefik
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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10
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Kim S, Lee S, Choi SH, Char K. Chain Exchange Kinetics of Bottlebrush Block Copolymer Micelles. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00155] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Seyoung Kim
- Department of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Sangho Lee
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Soo-Hyung Choi
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Kookheon Char
- Department of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Republic of Korea
- The National Creative Research Initiative Center for Intelligent Hybrids, Seoul National University, Seoul 08826, Republic of Korea
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11
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Smith AJ, Alcock SG, Davidson LS, Emmins JH, Hiller Bardsley JC, Holloway P, Malfois M, Marshall AR, Pizzey CL, Rogers SE, Shebanova O, Snow T, Sutter JP, Williams EP, Terrill NJ. I22: SAXS/WAXS beamline at Diamond Light Source - an overview of 10 years operation. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:939-947. [PMID: 33950002 PMCID: PMC8127364 DOI: 10.1107/s1600577521002113] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 02/23/2021] [Indexed: 05/04/2023]
Abstract
Beamline I22 at Diamond Light Source is dedicated to the study of soft-matter systems from both biological and materials science. The beamline can operate in the range 3.7 keV to 22 keV for transmission SAXS and 14 keV to 20 keV for microfocus SAXS with beam sizes of 240 µm × 60 µm [full width half-maximum (FWHM) horizontal (H) × vertical (V)] at the sample for the main beamline, and approximately 10 µm × 10 µm for the dedicated microfocusing platform. There is a versatile sample platform for accommodating a range of facilities and user-developed sample environments. The high brilliance of the insertion device source on I22 allows structural investigation of materials under extreme environments (for example, fluid flow at high pressures and temperatures). I22 provides reliable access to millisecond data acquisition timescales, essential to understanding kinetic processes such as protein folding or structural evolution in polymers and colloids.
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Affiliation(s)
- A. J. Smith
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - S. G. Alcock
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - L. S. Davidson
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. H. Emmins
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. C. Hiller Bardsley
- King’s College London, Guy’s Campus, Great Maze Pond, London SE1 1UL, United Kingdom
| | - P. Holloway
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - M. Malfois
- ALBA Synchrotron, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Barcelona, Spain
| | - A. R. Marshall
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - C. L. Pizzey
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - S. E. Rogers
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - O. Shebanova
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - T. Snow
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - J. P. Sutter
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - E. P. Williams
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - N. J. Terrill
- Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
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12
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13
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Huang GR, Tung CH, Chang D, Lam CN, Do C, Shinohara Y, Chang SY, Wang Y, Hong K, Chen WR. Determining population densities in bimodal micellar solutions using contrast-variation small angle neutron scattering. J Chem Phys 2020; 153:184902. [PMID: 33187411 DOI: 10.1063/5.0024410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Self-assembly of amphiphilic polymers in water is of fundamental and practical importance. Significant amounts of free unimers and associated micellar aggregates often coexist over a wide range of phase regions. The thermodynamic and kinetic properties of the microphase separation are closely related to the relative population density of unimers and micelles. Although the scattering technique has been employed to identify the structure of micellar aggregates as well as their time-evolution, the determination of the population ratio of micelles to unimers remains a challenging problem due to their difference in scattering power. Here, using small-angle neutron scattering (SANS), we present a comprehensive structural study of amphiphilic n-dodecyl-PNIPAm polymers, which shows a bimodal size distribution in water. By adjusting the deuterium/hydrogen ratio of water, the intra-micellar polymer and water distributions are obtained from the SANS spectra. The micellar size and number density are further determined, and the population densities of micelles and unimers are calculated to quantitatively address the degree of micellization at different temperatures. Our method can be used to provide an in-depth insight into the solution properties of microphase separation, which are present in many amphiphilic systems.
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Affiliation(s)
- Guan-Rong Huang
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Chi-Huan Tung
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Dongsook Chang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Christopher N Lam
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Changwoo Do
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Yuya Shinohara
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Shou-Yi Chang
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yangyang Wang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Kunlun Hong
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Wei-Ren Chen
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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14
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Zhao Y, Fang C, Zhang G, Hubble D, Nallapaneni A, Zhu C, Zhao Z, Liu Z, Lau J, Fu Y, Liu G. A Micelle Electrolyte Enabled by Fluorinated Ether Additives for Polysulfide Suppression and Li Metal Stabilization in Li-S Battery. Front Chem 2020; 8:484. [PMID: 32637395 PMCID: PMC7317089 DOI: 10.3389/fchem.2020.00484] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 05/11/2020] [Indexed: 11/23/2022] Open
Abstract
The Li-S battery is a promising next-generation technology due to its high theoretical energy density (2600 Wh kg−1) and low active material cost. However, poor cycling stability and coulombic efficiency caused by polysulfide dissolution have proven to be major obstacles for a practical Li-S battery implementation. In this work, we develop a novel strategy to suppress polysulfide dissolution using hydrofluoroethers (HFEs) with bi-functional, amphiphlic surfactant-like design: a polar lithiophilic “head” attached to a fluorinated lithiophobic “tail.” A unique solvation mechanism is proposed for these solvents whereby dissociated lithium ions are readily coordinated with lithiophilic “head” to induce self-assembly into micelle-like complex structures. Complex formation is verified experimentally by changing the additive structure and concentration using small angle X-ray scattering (SAXS). These HFE-based electrolytes are found to prevent polysulfide dissolution and to have excellent chemical compatibility with lithium metal: Li||Cu stripping/plating tests reveal high coulombic efficiency (>99.5%), modest polarization, and smooth surface morphology of the uniformly deposited lithium. Li-S cells are demonstrated with 1395 mAh g−1 initial capacity and 71.9% retention over 100 cycles at >99.5% efficiency—evidence that the micelle structure of the amphiphilic additives in HFEs can prohibit polysulfide dissolution while enabling facile Li+ transport and anode passivation.
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Affiliation(s)
- Yangzhi Zhao
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Chen Fang
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Guangzhao Zhang
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Dion Hubble
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Asritha Nallapaneni
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, United States.,Department of Polymer Engineering, University of Akron, Akron, OH, United States
| | - Chenhui Zhu
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
| | - Zhuowen Zhao
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, United States
| | - Zhimeng Liu
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Jonathan Lau
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Yanbao Fu
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
| | - Gao Liu
- Lawrence Berkeley National Laboratory, Energy Storage and Distributed Resources Division, Berkeley, CA, United States
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15
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Prhashanna A, Dormidontova EE. Micelle Self-Assembly and Chain Exchange Kinetics of Tadpole Block Copolymers with a Cyclic Corona Block. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02398] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ammu Prhashanna
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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16
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Takahashi R, Miwa S, Sobotta FH, Lee JH, Fujii S, Ohta N, Brendel JC, Sakurai K. Unraveling the kinetics of the structural development during polymerization-induced self-assembly: decoupling the polymerization and the micelle structure. Polym Chem 2020. [DOI: 10.1039/c9py01810g] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Upon extending a hydrophobic polymer chain from the end of a preceding hydrophilic chain in aqueous solutions, the resultant block copolymers may eventually undergo self-assembly.
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Affiliation(s)
- Rintaro Takahashi
- Department of Chemistry and Biochemistry
- University of Kitakyushu
- Fukuoka 808-0135
- Japan
| | - Shotaro Miwa
- Department of Chemistry and Biochemistry
- University of Kitakyushu
- Fukuoka 808-0135
- Japan
| | - Fabian H. Sobotta
- Laboratory of Organic and Macromolecular Chemistry (IOMC)
- Friedrich Schiller University Jena
- 07743 Jena
- Germany
- Jena Center for Soft Matter (JCSM)
| | - Ji Ha Lee
- Department of Chemistry and Biochemistry
- University of Kitakyushu
- Fukuoka 808-0135
- Japan
| | - Shota Fujii
- Department of Chemistry and Biochemistry
- University of Kitakyushu
- Fukuoka 808-0135
- Japan
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute (JASRI/SPring-8)
- Hyogo 679-5198
- Japan
| | - Johannes C. Brendel
- Laboratory of Organic and Macromolecular Chemistry (IOMC)
- Friedrich Schiller University Jena
- 07743 Jena
- Germany
- Jena Center for Soft Matter (JCSM)
| | - Kazuo Sakurai
- Department of Chemistry and Biochemistry
- University of Kitakyushu
- Fukuoka 808-0135
- Japan
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17
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Lee YT, Li DS, Pozzo LD. Kinetic Analysis of Ultrasound-Induced Oil Exchange in Oil-in-Water Emulsions through Contrast Variation Time-Resolved Small-Angle Neutron Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15204-15213. [PMID: 31689364 DOI: 10.1021/acs.langmuir.9b02424] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ultrasound is one of the most commonly used methods for synthesizing and processing emulsion systems. In this study, the kinetics of acoustically induced emulsion oil exchange was examined using contrast variation time-resolved small-angle neutron scattering (CV-SANS). A custom-built sample environment was used to deliver acoustic forces while simultaneously performing CV-SANS experiments. It was observed that the oil exchange rate was significantly accelerated when sonicating at high acoustic pressures, where violent cavitation events can induce droplet coalescence and breakup. No significant oil exchange occurred at acoustic pressures below the cavitation threshold within the short time scales of the experiments. It was also observed that the oil exchange kinetics was deterred when emulsions were stabilized by surfactants. In addition, oil exchange rates varied nonlinearly with the concentration of surfactant, and exchange was slowest when the emulsions were stabilized by an intermediate concentration. It is hypothesized that emulsion size, electrostatic repulsion, and Gibbs elasticity of the oil-water interface play significant roles in the observed trends. The observed trends in oil exchange rates versus surfactant concentration coincide well with theoretical models for the fluctuation of the elasticity of the interface. Acoustically induced oil exchange was most inefficient when the interfacial elasticity was at its maximum value.
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18
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Lee YT, Pozzo LD. Contrast-Variation Time-Resolved Small-Angle Neutron Scattering Analysis of Oil-Exchange Kinetics Between Oil-in-Water Emulsions Stabilized by Anionic Surfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15192-15203. [PMID: 31689363 DOI: 10.1021/acs.langmuir.9b02423] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Contrast-variation time-resolved small-angle neutron scattering (CV-SANS) was used to examine oil-exchange kinetics between identical mixtures of hydrogenated/deuterated hexadecane emulsion systems. Oil-exchange rates were estimated by transforming recorded scattering profiles to a relaxation function and by fitting to exponential decay models. We find that the oil-exchange process was accelerated when the droplets were stabilized by anionic surfactants even at concentrations well below the surfactant critical micelle concentration. Moreover, the exchange rate was not significantly accelerated when surfactant micelles were present. This suggests that micellar-mediated transport mechanisms do not play the dominant role in these systems. Screening electrostatic repulsion by increasing the ionic strength of the medium also had a negligible effect on oil-exchange kinetics. In contrast, the use of oils with shorter alkane chain lengths (e.g., dodecane), having a higher solubility in water, significantly accelerated rates of oil transport between droplets. Oil-transport rates for hexadecane were also found to increase with temperature and to follow Arrhenius behavior. These results were rationalized as an increase in the droplet-collision frequency due to Brownian motion that results in direct oil transport without irreversible coalescence. Thus, primary mechanisms for oil exchange in insoluble anionic surfactant-stabilized emulsion systems are hypothesized to be through direct emulsion contact, reversible coalescence, and/or direct oil permeation through thin liquid films. CV-SANS is also demonstrated as a powerful technique for the study of transport kinetics in all kinds of emulsion systems.
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Affiliation(s)
- Yi-Ting Lee
- Department of Chemical Engineering , University of Washington , Seattle , Washington 98195 , United States
| | - Lilo D Pozzo
- Department of Chemical Engineering , University of Washington , Seattle , Washington 98195 , United States
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19
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Amann M, Diget JS, Lyngsø J, Pedersen JS, Narayanan T, Lund R. Kinetic Pathways for Polyelectrolyte Coacervate Micelle Formation Revealed by Time-Resolved Synchrotron SAXS. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01072] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Matthias Amann
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jakob Stensgaard Diget
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jeppe Lyngsø
- Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
| | - Jan Skov Pedersen
- Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
| | - Theyencheri Narayanan
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble, France
| | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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20
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Maric S, Lind TK, Raida MR, Bengtsson E, Fredrikson GN, Rogers S, Moulin M, Haertlein M, Forsyth VT, Wenk MR, Pomorski TG, Arnebrant T, Lund R, Cárdenas M. Time-resolved small-angle neutron scattering as a probe for the dynamics of lipid exchange between human lipoproteins and naturally derived membranes. Sci Rep 2019; 9:7591. [PMID: 31110185 PMCID: PMC6527577 DOI: 10.1038/s41598-019-43713-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 04/27/2019] [Indexed: 12/21/2022] Open
Abstract
Atherosclerosis is the main killer in the western world. Today’s clinical markers include the total level of cholesterol and high-/low-density lipoproteins, which often fails to accurately predict the disease. The relationship between the lipid exchange capacity and lipoprotein structure should explain the extent by which they release or accept lipid cargo and should relate to the risk for developing atherosclerosis. Here, small-angle neutron scattering and tailored deuteration have been used to follow the molecular lipid exchange between human lipoprotein particles and cellular membrane mimics made of natural, “neutron invisible” phosphatidylcholines. We show that lipid exchange occurs via two different processes that include lipid transfer via collision and upon direct particle tethering to the membrane, and that high-density lipoprotein excels at exchanging the human-like unsaturated phosphatidylcholine. By mapping the specific lipid content and level of glycation/oxidation, the mode of action of specific lipoproteins can now be deciphered. This information can prove important for the development of improved diagnostic tools and in the treatment of atherosclerosis.
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Affiliation(s)
- Selma Maric
- Dept. of Biomedical Science, Malmö University, Per Albin Hanssons väg 35, 205 02, Malmö, Sweden.
| | - Tania Kjellerup Lind
- Dept. of Biomedical Science, Malmö University, Per Albin Hanssons väg 35, 205 02, Malmö, Sweden
| | - Manfred Roman Raida
- Singapore Lipidomics Incubator (SLING), Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Eva Bengtsson
- Dept. of Clinical Sciences, Lund University, Jan Waldenströms gata 35, CRC, Box 50332, 212 13, Malmö, Sweden
| | - Gunilla Nordin Fredrikson
- Dept. of Clinical Sciences, Lund University, Jan Waldenströms gata 35, CRC, Box 50332, 212 13, Malmö, Sweden
| | - Sarah Rogers
- ISIS Science and Technology Facilities Council, Harwell Science and Innovation Campus, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom
| | - Martine Moulin
- Life Science Group, Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, F-38042, Grenoble, Cedex 9, France
| | - Michael Haertlein
- Life Science Group, Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, F-38042, Grenoble, Cedex 9, France
| | - V Trevor Forsyth
- Life Science Group, Institut Laue Langevin, 6, rue Jules Horowitz, BP 156, F-38042, Grenoble, Cedex 9, France.,Faculty of Natural Science and Institute for Science and Technology in Medicine, Keele University, Staffordshire, ST5 5BG, United Kingdom
| | - Markus R Wenk
- Singapore Lipidomics Incubator (SLING), Life Sciences Institute, National University of Singapore, Singapore, Singapore
| | - Thomas Günther Pomorski
- Dept. of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871, Frederiksberg C, Denmark.,Dept. of Molecular Biochemistry, Ruhr University Bochum, Faculty of Chemistry and Biochemistry, 44780, Bochum, Germany
| | - Thomas Arnebrant
- Dept. of Biomedical Science, Malmö University, Per Albin Hanssons väg 35, 205 02, Malmö, Sweden
| | - Reidar Lund
- Dept. of Chemistry, University of Oslo, Blindern, 0315, Oslo, Norway
| | - Marité Cárdenas
- Dept. of Biomedical Science, Malmö University, Per Albin Hanssons väg 35, 205 02, Malmö, Sweden.
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21
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Dahal UR, Prhashanna A, Dormidontova EE. Hydration of diblock copolymer micelles: Effects of hydrophobicity and co-solvent. J Chem Phys 2019; 150:184908. [PMID: 31091932 DOI: 10.1063/1.5089251] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Diblock polymer micelles dispersed in an aqueous environment are being actively investigated for various applications, but there is only a qualitative understanding of the effect of the chemical structure on the micelle hydration and water dynamics as these properties are difficult to assess experimentally. Using all-atom molecular dynamics simulations, we investigate aqueous solutions of three comparable in size diblock copolymer micelles with core-forming blocks of different hydrophobicity: polybutadiene (PB), polycaprolactone (PCL), and polytetrahydrofuran (pTHF) with the same hydrophilic block, polyethylene oxide (PEO). We found that core-block hydrophobicity and ability to form hydrogen bonds with water strongly affect the water dynamics near the core: water molecules spend considerably less time in contact with the PB block than with PCL and pTHF blocks. We obtained polymer and solvent volume fraction profiles and determined that the interfacial width systematically increases with a decrease of core block hydrophobicity with water penetration into the core being negligible for PB-PEO and PCL-PEO micelles, while for pTHF-PEO micelles the interface is more diffuse and there is a noticeable penetration of water (17% by volume). For PCL-PEO micelles, which are commonly used in biomedical applications, we also investigated tetrahydrofuran (THF) penetration into the micelles from mixed THF:water solution at early stages of micelle dissolution. We found an inhomogeneous solvent distribution with a maximum of THF volume fraction in the interfacial core-corona region and partial exclusion from the PEO corona, which slows down micelle dissolution. These results can have important implications for micelle stability and use in biomedical applications.
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Affiliation(s)
- Udaya R Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Ammu Prhashanna
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
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22
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Takahashi R, Kawauchi H, Kameta N, Lee JH, Fujii S, Shimizu T, Sakurai K. Observing the Kinetic Pathway of Nanotube Formation from Bolaamphiphiles by Time-Resolved Small-Angle X-ray Scattering. J Phys Chem B 2019; 123:4340-4345. [PMID: 31017437 DOI: 10.1021/acs.jpcb.9b01746] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We investigated the formation kinetics of a single monolayer nanotube from bolaamphiphiles (consisting of a sugar residue, an alkyl chain, and an amino group) in solution. In this bolaamphiphile, a transition from a monomerically dispersed state to the nanotube takes place by changing the solvent condition. This transition was induced by fast mixing with a stopped-flow apparatus. From just after the mixing, this transition process was monitored in situ by time-resolved small-angle X-ray scattering. In this manner, we were able to derive the direct structural information as a function of time during the nanotube formation. The results revealed that disklike aggregates initially formed, which then grew and closed to produce a tubular structure.
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Affiliation(s)
- Rintaro Takahashi
- Department of Chemistry and Biochemistry , University of Kitakyushu , 1-1 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0135 , Japan
| | - Hiroki Kawauchi
- Department of Chemistry and Biochemistry , University of Kitakyushu , 1-1 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0135 , Japan
| | | | - Ji Ha Lee
- Department of Chemistry and Biochemistry , University of Kitakyushu , 1-1 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0135 , Japan
| | - Shota Fujii
- Department of Chemistry and Biochemistry , University of Kitakyushu , 1-1 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0135 , Japan
| | | | - Kazuo Sakurai
- Department of Chemistry and Biochemistry , University of Kitakyushu , 1-1 Hibikino , Wakamatsu-ku, Kitakyushu , Fukuoka 808-0135 , Japan
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23
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Affiliation(s)
- Takahiro SATO
- Department of Macromolecular Science, Osaka University
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24
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Xie R, López-Barrón CR, Greene DG, Wagner NJ. Comicellization of Binary PEO–PPO–PEO Triblock Copolymer Mixtures in Ethylammonium Nitrate. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ru Xie
- Center
for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Carlos R. López-Barrón
- Baytown
Technology and Engineering Complex, ExxonMobil Chemical Company, Baytown, Texas 77520, United States
| | - Daniel G. Greene
- Center
for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Norman J. Wagner
- Center
for Neutron Science, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
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25
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Parent LR, Bakalis E, Ramírez-Hernández A, Kammeyer JK, Park C, de Pablo J, Zerbetto F, Patterson JP, Gianneschi NC. Directly Observing Micelle Fusion and Growth in Solution by Liquid-Cell Transmission Electron Microscopy. J Am Chem Soc 2017; 139:17140-17151. [DOI: 10.1021/jacs.7b09060] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Lucas R. Parent
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Evangelos Bakalis
- Dipartimento
di Chimica “G. Ciamician”, Università di Bologna, Bologna 40126, Italy
| | - Abelardo Ramírez-Hernández
- Materials
Science Division and Institute for Molecular Engineering, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Institute
for Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, United States
| | - Jacquelin K. Kammeyer
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Chiwoo Park
- Department
of Industrial and Manufacturing Engineering, Florida State University, Tallahassee, Florida 32306, United States
| | - Juan de Pablo
- Materials
Science Division and Institute for Molecular Engineering, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Institute
for Molecular Engineering, The University of Chicago, Chicago, Illinois 60637, United States
| | - Francesco Zerbetto
- Dipartimento
di Chimica “G. Ciamician”, Università di Bologna, Bologna 40126, Italy
| | - Joseph P. Patterson
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
- Laboratory
of Materials and Interface Chemistry and Center of Multiscale Electron
Microscopy, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven 5612 AZ, The Netherlands
| | - Nathan C. Gianneschi
- Department of Chemistry & Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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26
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Zinn T, Willner L, Knudsen KD, Lund R. Self-Assembly of Mixtures of Telechelic and Monofunctional Amphiphilic Polymers in Water: From Clusters to Flowerlike Micelles. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01501] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Thomas Zinn
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
| | - Lutz Willner
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Kenneth D. Knudsen
- Department
of Physics, Institute for Energy Technology, Postboks 40, 2027 Kjeller, Norway
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
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27
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Peters AJ, Lodge TP. Chain Exchange Kinetics of Asymmetric B1AB2 Linear Triblock and AB1B2 Branched Triblock Copolymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01046] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Andrew J. Peters
- Department
of Chemistry and ‡Department of Chemical Engineering and Materials
Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department
of Chemistry and ‡Department of Chemical Engineering and Materials
Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
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28
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Takahashi R, Matsumoto S, Fujii S, Narayanan T, Sakurai K. Monitoring the Discontinuous Dodecamer-Icosamer Transition of a Calix[4]arene-Derived Surfactant by Time-Resolved Small-Angle X-ray Scattering. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702260] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rintaro Takahashi
- ESRF-The European Synchrotron; 71 Avenue des Martyrs 38043 Grenoble France
- Department of Chemistry and Biochemistry; University of Kitakyushu; 1-1 Hibikino, Wakamatsu-ku, Kitakyushu Fukuoka 808-0135 Japan
| | - Sakiko Matsumoto
- Department of Chemistry and Biochemistry; University of Kitakyushu; 1-1 Hibikino, Wakamatsu-ku, Kitakyushu Fukuoka 808-0135 Japan
| | - Shota Fujii
- Department of Chemistry and Biochemistry; University of Kitakyushu; 1-1 Hibikino, Wakamatsu-ku, Kitakyushu Fukuoka 808-0135 Japan
| | | | - Kazuo Sakurai
- Department of Chemistry and Biochemistry; University of Kitakyushu; 1-1 Hibikino, Wakamatsu-ku, Kitakyushu Fukuoka 808-0135 Japan
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29
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Takahashi R, Matsumoto S, Fujii S, Narayanan T, Sakurai K. Monitoring the Discontinuous Dodecamer-Icosamer Transition of a Calix[4]arene-Derived Surfactant by Time-Resolved Small-Angle X-ray Scattering. Angew Chem Int Ed Engl 2017; 56:6734-6738. [PMID: 28481461 DOI: 10.1002/anie.201702260] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Indexed: 11/07/2022]
Abstract
Calix[4]arene-derived surfactants form monodisperse micelles with a well-defined aggregation number (Nagg ) of 4, 6, 8, 12, or 20, corresponding to the Platonic solids. This feature is in strong contrast to conventional micelles. In this study, a transition from a dodecamer (Nagg =12) to an icosamer (Nagg =20) was induced by a rapid increase in the NaCl concentration (CNaCl ) using a stopped-flow device and directly observed by time-resolved small-angle X-ray scattering. The Nagg remained unchanged during the first 60 s after the increase in CNaCl , and then abruptly increased to 20. This feature resembles phase transitions in supersaturated or supercooled states, or highly cooperative phenomena. We surmise that this finding may be due to the fact that only a few Nagg values are thermodynamically allowed when Nagg is sufficiently small. This is the first observation of such an induction time in micellar aggregation.
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Affiliation(s)
- Rintaro Takahashi
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, 38043, Grenoble, France.,Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan
| | - Sakiko Matsumoto
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan
| | - Shota Fujii
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan
| | | | - Kazuo Sakurai
- Department of Chemistry and Biochemistry, University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan
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30
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Schantz AB, Saboe PO, Sines IT, Lee HY, Bishop KJM, Maranas JK, Butler PD, Kumar M. PEE–PEO Block Copolymer Exchange Rate between Mixed Micelles Is Detergent and Temperature Activated. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b01973] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Allen B. Schantz
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Patrick O. Saboe
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Ian T. Sines
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Hee-Young Lee
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Kyle J. M. Bishop
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Janna K. Maranas
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Paul D. Butler
- NIST
Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department
of Chemistry, University of Tennessee, Knoxville, Knoxville, Tennessee 37996-1600, United States
| | - Manish Kumar
- Department
of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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31
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Takahashi R, Narayanan T, Sato T. Growth Kinetics of Polyelectrolyte Complexes Formed from Oppositely-Charged Homopolymers Studied by Time-Resolved Ultra-Small-Angle X-ray Scattering. J Phys Chem Lett 2017; 8:737-741. [PMID: 28121154 DOI: 10.1021/acs.jpclett.6b02957] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have monitored the kinetic process of polyelectrolyte complex formation between sodium polyacrylate (SPA) and polyallylamine hydrochrolide (PAH) in aqueous NaCl solution by time-resolved ultra-small-angle X-ray scattering (TR-USAXS) combined with rapid mixing. SPA and PAH with different NaCl concentrations from 0 to 1 M were rapidly mixed in equimolar concentration of the monomer units using a stopped-flow apparatus with a dead time of about 2.5 ms. Within the dead time, percolated aggregate-like structures were observed suggesting that the initially formed small charge neutral aggregates further assembled to form higher order agglomerates. The early stage time evolution of the molar mass of the global structure in the presence of NaCl was found to be comparable to the Brownian-coagulation rate.
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Affiliation(s)
- Rintaro Takahashi
- ESRF-The European Synchrotron, 71 Avenue des Martyrs, F-38043 Grenoble, France
- Department of Macromolecular Science, Osaka University , 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | | | - Takahiro Sato
- Department of Macromolecular Science, Osaka University , 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
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32
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Narayanan T, Wacklin H, Konovalov O, Lund R. Recent applications of synchrotron radiation and neutrons in the study of soft matter. CRYSTALLOGR REV 2017. [DOI: 10.1080/0889311x.2016.1277212] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - Hanna Wacklin
- European Spallation Source ERIC, Lund, Sweden
- Physical Chemistry, Lund University, Lund, Sweden
| | | | - Reidar Lund
- Department of Chemistry, University of Oslo, Blindern, Oslo, Norway
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33
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Lokupitiya HN, Stefik M. Cavitation-enabled rapid and tunable evolution of high-χN micelles as templates for ordered mesoporous oxides. NANOSCALE 2017; 9:1393-1397. [PMID: 27796395 DOI: 10.1039/c6nr07313a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The kinetic-entrapment of block copolymer micelles enables size-persistence, however tuning micelle sizes under such conditions remains challenging. Agitation-induced chain exchange via vortexing is limited by the production of solution-air interfaces. Here, we use ultrasonic cavitation for rapid interface production that accelerates micelle growth by an order of magnitude over vortexing.
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Affiliation(s)
- Hasala N Lokupitiya
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Morgan Stefik
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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34
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Zinn T, Willner L, Lund R. Telechelic Polymer Hydrogels: Relation between the Microscopic Dynamics and Macroscopic Viscoelastic Response. ACS Macro Lett 2016; 5:1353-1356. [PMID: 35651198 DOI: 10.1021/acsmacrolett.6b00824] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Telechelic polymers, that is, hydrophilic polymers with hydrophobic end-groups, spontaneously form hydrogels consisting of interconnected micelles. Here we investigate the relation between the microscopic dynamics determining the connectivity, that is, the lifetime of the physical bonds and the resulting rheological properties. This is achieved by quantitatively relating the chain exchange kinetics measured by time-resolved small-angle neutron scattering (TR-SANS) and the mechanical response obtained from linear oscillatory shear measurements. The results show that the characteristic relaxation time obtained from rheology coincides exactly with TR-SANS at intermediate concentrations. The activation energy, Ea, is concentration-independent and remain exactly the same as for TR-SANS. Upon crossing the melting point, a discrete change in activation energy is observed showing the contribution from the enthalpy of fusion to the release/debridging process. The results clearly show that the mechanical response and connectivity indeed are controlled by molecular exchange processes. The relaxation time at the lowest concentration is found to be faster in rheology as compared to TR-SANS, which can be quantitatively attributed to entropic forces arising from conformational deformation of bridging chains.
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Affiliation(s)
- Thomas Zinn
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
| | - Lutz Willner
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
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35
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Zinn T, Willner L, Pipich V, Richter D, Lund R. Molecular Exchange Kinetics of Micelles: Corona Chain Length Dependence. ACS Macro Lett 2016; 5:884-888. [PMID: 35614762 DOI: 10.1021/acsmacrolett.6b00395] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The rate of molecular exchange in diblock copolymer micelles is strongly dependent on the chain length of the core-forming insoluble block. Less is known about the influence of the soluble block forming the micellar corona. In this study we present a time-resolved small angle neutron scattering (TR-SANS) study exploring systematically the effect of corona chain length on the dynamics of chain exchange. As a model system we have taken amphiphilic AB diblock copolymers of the type C27H55-poly(ethylene oxide)x (C27-PEOx) with varying x between 4 and 36 kg/mol in aqueous solution in which well-defined spherical micelles with partially crystalline cores are formed. The TR-SANS results show that the chain exchange slows down considerably upon increasing PEO molecular weight, while the characteristic "attempt time" constant, τ0, was found to increase with a power law dependence τ0 ∼ MPEO9/5. The results are in excellent agreement with the Halperin and Alexander model1 and can be attributed to a reduced diffusion rate through the micellar corona. Our results clearly demonstrate that the rate for molecular exchange is not directly coupled to the solubility of the amphiphile and the critical micellar concentration, as has previously been indicated.
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Affiliation(s)
- Thomas Zinn
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
| | - Lutz Willner
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Vitaliy Pipich
- Jülich
Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation
at MLZ, Lichtenbergstrasse 1 85747 Garching, Germany
| | - Dieter Richter
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
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36
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Ye X, Li ZW, Sun ZY, Khomami B. Template-Free Bottom-Up Method for Fabricating Diblock Copolymer Patchy Particles. ACS NANO 2016; 10:5199-5203. [PMID: 27109249 DOI: 10.1021/acsnano.6b00742] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Patchy particles are one of most important building blocks for hierarchical structures because of the discrete patches on their surface. We have demonstrated a convenient, simple, and scalable bottom-up method for fabricating diblock copolymer patchy particles through both experiments and dissipative particle dynamics (DPD) simulations. The experimental method simply involves reducing the solvent quality of the diblock copolymer solution by the slow addition of a nonsolvent. Specifically, the fabrication of diblock copolymer patchy particles begins with a crew-cut soft-core micelle, where the micelle core is significantly swelled by the solvent. With water addition at an extremely slow rate, the crew-cut soft-core micelles first form a larger crew-cut micelle. With further water addition, the corona-forming blocks of the crew-cut micelles begin to aggregate and eventually form well-defined patches. Both experiments and DPD simulations indicate that the number of patches has a very strong dependence on the diblock copolymer composition-the particle has more patches on the surface with a lower volume fraction of patch-forming blocks. Furthermore, particles with more patches have a greater ability to assemble, and particles with fewer patches have a greater ability to merge once assembled.
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Affiliation(s)
- Xianggui Ye
- Materials Research and Innovation Laboratory (MRAIL), Sustainable Energy Education and Research Center (SEERC), Department of Chemical and Biomolecular Engineering, The University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Zhan-Wei Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China
| | - Zhao-Yan Sun
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China
| | - Bamin Khomami
- Materials Research and Innovation Laboratory (MRAIL), Sustainable Energy Education and Research Center (SEERC), Department of Chemical and Biomolecular Engineering, The University of Tennessee , Knoxville, Tennessee 37996, United States
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37
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Prhashanna A, Khan SA, Chen SB. Kinetics of Chain Exchange between Diblock Copolymer Micelles. MACROMOL THEOR SIMUL 2016. [DOI: 10.1002/mats.201600016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ammu Prhashanna
- Department of Chemical and Biomolecular Engineering; National University of Singapore; Singapore 117585 Singapore
| | - Saif A. Khan
- Department of Chemical and Biomolecular Engineering; National University of Singapore; Singapore 117585 Singapore
| | - Shing Bor Chen
- Department of Chemical and Biomolecular Engineering; National University of Singapore; Singapore 117585 Singapore
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38
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Diamant H, Andelman D. Free energy approach to micellization and aggregation: Equilibrium, metastability, and kinetics. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.03.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Lund R, Brun G, Chevallier E, Narayanan T, Tribet C. Kinetics of Photocontrollable Micelles: Light-Induced Self-Assembly and Disassembly of Azobenzene-Based Surfactants Revealed by TR-SAXS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2539-48. [PMID: 26928121 DOI: 10.1021/acs.langmuir.5b04711] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The kinetics of micelles involving photosensitive surfactants is still not well understood. In this work, we unravel the mechanistic pathways involved in the micelle formation and dissolution of photocontrollable micelles. We focus on the fast self-assembly processes of photosensitive cationic azobenzene-containing surfactants (AzoTMA) that display a change in hydrophobicity induced by a reversible cis-trans conformational transition upon exposure to light. By combining both in situ time-resolved small-angle X-ray scattering (SAXS) and light scattering, we characterized the detailed structure and phase behavior of AzoTMA in mixtures of water and dimethylformamide (DMF). Time-resolved synchrotron SAXS with monochromatic light as a trigger enabled us to observe the nonequilibrium formation and dissolution process of micelles (demicellization) directly on the nanoscale with a time resolution starting from milliseconds. The structural results show that in pure water UV-light illumination leads to a 12% reduction of the aggregation number of the micelles and more than a 50% increase in the critical micelle concentration (CMC). Close to the CMC, adjusted by the addition of DMF, UV light illumination leads to a complete dissolution of the micelles, while shining blue light reverses the process and leads to the reformation of micelles. The UV-triggered dissolution follows a two-step mechanism; the first and rapid (second time scale) release of unimers is followed by a slower decomposition of the micelles (over tens of seconds) as a result of an increase in temperature due to optical absorption. Similarly, the reverse process, i.e., micelle formation, occurs rapidly upon photoconversion to trans conformers under blue light, and micelles are disrupted at long exposure time due to the optical absorption and corresponding increase in temperature. Interestingly, the coexistence of unimers with regular micelles is found at all times, and no other transient assemblies could be detected by SAXS.
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Affiliation(s)
- Reidar Lund
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Geoffrey Brun
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 8640 PASTEUR, 24 rue Lhomond, 75005 Paris, France
| | - Eloïse Chevallier
- PSL Research University, Ecole Super. Phys. & Chim. Ind. ESPCI, Sci & Ingn Matiere Molle, ParisTech, CNRS UMR 7615, 10 Rue Vauquelin, F-75231 Paris 05, France
| | | | - Christophe Tribet
- Ecole Normale Supérieure-PSL Research University, Département de Chimie, Sorbonne Universités - UPMC Univ Paris 06, CNRS UMR 8640 PASTEUR, 24 rue Lhomond, 75005 Paris, France
- PSL Research University, Ecole Super. Phys. & Chim. Ind. ESPCI, Sci & Ingn Matiere Molle, ParisTech, CNRS UMR 7615, 10 Rue Vauquelin, F-75231 Paris 05, France
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40
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Lu J, Bates FS, Lodge TP. Addition of Corona Block Homopolymer Retards Chain Exchange in Solutions of Block Copolymer Micelles. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02395] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- J. Lu
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - F. S. Bates
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - T. P. Lodge
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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41
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Bekhradnia S, Naz I, Lund R, Effenberg C, Appelhans D, Sande SA, Nyström B. Characterization of oligosaccharide-functionalized hyperbranched poly(ethylene imine) and their complexes with retinol in aqueous solution. J Colloid Interface Sci 2015. [PMID: 26218197 DOI: 10.1016/j.jcis.2015.07.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Structure, internal density distribution, and size of hyperbranched poly(ethylene imine) (PEI) functionalized with various amounts of maltose (PEI-Mal) in phosphate buffer were studied by small angle X-ray scattering (SAXS) and dynamic light scattering (DLS). The value of pH was varied in the range from 3 to 9. Virtually no effect of pH on the nanostructure was found in this interval. The SAXS results revealed a broad segmental radial density distribution, i.e. a "fluffy" globular structure rather than a distinct core-shell structure with a high-density compact core and a low-density corona. This suggests that the maltose units are rather evenly distributed both in the interior and on the surface of the species with a PEI-core of molar mass of 25,000g/mol. The DLS measurements showed that the overall size of the PEI-Mal derivatives increased as the number of maltose units in the PEI-Mal structures rises. The interaction of the hydrophobic model drug retinol with PEI or PEI-Mal derivatives was also investigated. The UV-visible spectroscopy results disclosed that the solubility of retinol in the phosphate buffer is very poor and it takes a very long time to solubilize retinol. Moreover, retinol induces aggregation of dendritic glycopolymers where the growth of aggregates occurs continuously over several days and then remains virtually constant.
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Affiliation(s)
- Sara Bekhradnia
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway; School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Iram Naz
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway; School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
| | - Christiane Effenberg
- Leibni-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, D-01069 Dresden, Germany.
| | - Dietmar Appelhans
- Leibni-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, D-01069 Dresden, Germany.
| | - Sverre Arne Sande
- School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
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42
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Ye X, Niroomand H, Hu S, Khomami B. Block copolymer micelle formation in a solvent good for all the blocks. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3658-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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43
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Zinn T, Willner L, Pipich V, Richter D, Lund R. Effect of Core Crystallization and Conformational Entropy on the Molecular Exchange Kinetics of Polymeric Micelles. ACS Macro Lett 2015; 4:651-655. [PMID: 35596408 DOI: 10.1021/acsmacrolett.5b00197] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Here we systematically study the equilibrium molecular exchange kinetics of a series of amphiphilic n-alkyl-poly(ethylene oxide) (Cn-PEO) micelles containing partly crystallized cores. Using differential scanning calorimetry (DSC), we determined the melting transition and extracted the enthalpy of fusion, ΔHfus, of the n-alkyl chains inside the micellar core. Molecular exchange kinetics was measured below the melting point using a time-resolved small-angle neutron scattering technique (TR-SANS) based on mixing deuterated and proteated but otherwise identical micelles. Comparing both kinetic and thermodynamic data, we find that crystallinity within the micellar cores leads to significant enthalpic and the entropic contributions to the activation barrier for molecular exchange. While the former leads to an enhanced stability, the positive entropic gain favors the process. Interestingly, the entropic term contains an excess term beyond what is expected from the measured entropy of fusion. Based on calculations using the Rotational Isomeric State (RIS) model, we suggest that the excess entropy is due to the gain in conformational entropy upon releasing the chain from the confined state in the core. The study thus provides deep insight into the fundamental processes of micellar kinetics and which might be relevant also to other semicrystalline soft matter and biological systems including lipid membranes.
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Affiliation(s)
- Thomas Zinn
- Department of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
| | - Lutz Willner
- Jülich Centre for Neutron Science JCNS and Institute for Complex Systems ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ, Lichtenbergstrasse 1 85747 Garching, Germany
| | - Dieter Richter
- Jülich Centre for Neutron Science JCNS and Institute for Complex Systems ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Reidar Lund
- Department of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
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44
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Amann M, Willner L, Stellbrink J, Radulescu A, Richter D. Studying the concentration dependence of the aggregation number of a micellar model system by SANS. SOFT MATTER 2015; 11:4208-4217. [PMID: 25892401 DOI: 10.1039/c5sm00469a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a small-angle neutron scattering (SANS) structural characterization of n-alkyl-PEO polymer micelles in aqueous solution with special focus on the dependence of the micellar aggregation number on increasing concentration. The single micellar properties in the dilute region up to the overlap concentration ϕ* are determined by exploiting the well characterized unimer exchange kinetics of the model system in a freezing and diluting experiment. The micellar solutions are brought to thermodynamic equilibrium at high temperatures, where unimer exchange is fast, and are then cooled to low temperatures and diluted to concentrations in the limit of infinite dilution. At low temperatures the kinetics, and therefore the key mechanism for micellar rearrangement, is frozen on the experimental time scale, thus preserving the micellar structure in the dilution process. Information about the single micellar structure in the semidilute and concentrated region are extracted from structure factor analysis at high concentrations where the micelles order into fcc and bcc close packed lattices and the aggregation number can be calculated by geometrical arguments. This approach enables us to investigate the aggregation behavior in a wide concentration regime from dilute to 6·ϕ*, showing a constant aggregation number with concentration over a large concentration regime up to a critical concentration about three times ϕ*. When exceeding this critical concentration, the aggregation number was found to increase with increasing concentration. This behavior is compared to scaling theories for star-like polymer micelles.
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Affiliation(s)
- Matthias Amann
- Jülich Centre for Neutron Science JCNS-1 & Institute of Complex Systems ICS-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
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45
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Lu J, Bates FS, Lodge TP. Remarkable Effect of Molecular Architecture on Chain Exchange in Triblock Copolymer Micelles. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00294] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jie Lu
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Frank S. Bates
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department of Chemical Engineering and Materials Science and ‡Department of
Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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46
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Hrubý M, Filippov SK, Štěpánek P. Smart polymers in drug delivery systems on crossroads: Which way deserves following? Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.01.016] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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47
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Kahnamouei F, Zhu K, Lund R, Knudsen KD, Nyström B. Self-assembly of a hydrophobically end-capped charged amphiphilic triblock copolymer: effects of temperature and salinity. RSC Adv 2015. [DOI: 10.1039/c5ra07657a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study elucidates the intricate interplay between hydrophobic and electrostatic interactions in aqueous solutions of a responsive charged triblock copolymer.
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Affiliation(s)
| | - Kaizheng Zhu
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Reidar Lund
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Kenneth D. Knudsen
- Department of Physics
- Institute for Energy Technology
- N-2027 Kjeller
- Norway
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
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48
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Newby GE, Watkins EB, Merino DH, Staniec PA, Bikondoa O. In situ Rheo-GISANS of triblock copolymers: gelation and shear effects on quasi-crystalline structures at interfaces. RSC Adv 2015. [DOI: 10.1039/c5ra20215a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The behaviour of polymeric systems at surfaces and under flow is very important in many applications, from drug delivery to lubrication. Here, we have studied the thermotropic phases formed by a model tri-block copolymer using in situ Rheo-GISANS.
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Affiliation(s)
- Gemma E. Newby
- ESRF-The European Synchrotron
- F-38043 Grenoble Cedex 9
- France
| | | | - Daniel Hermida Merino
- DUBBLE CRG BM26 ESRF
- Netherlands Organization for Scientific Research
- ESRF-The European Synchrotron
- Grenoble
- France
| | | | - Oier Bikondoa
- XMaS
- The UK CRG Beamline
- ESRF-The European Synchrotron
- F-38043 Grenoble Cedex 9
- France
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49
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Li Y, Peng B, Chen Y. Kinetically Trapped Block Copolymer Nano-Objects with Cylinder to Sphere Shape Transition Properties. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuyan Li
- Laboratory of Polymer Physics and Chemistry; Institute of Chemistry; The Chinese Academy of Sciences; Zhongguancun North First Street 2 Beijing 100190 P.R.China
| | - Bo Peng
- School of Chemistry and Chemical Engineering; Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education; Sun Yat-sen University; No. 135, Xingang Xi Road Guangzhou 510275 P.R.China
| | - Yongming Chen
- Laboratory of Polymer Physics and Chemistry; Institute of Chemistry; The Chinese Academy of Sciences; Zhongguancun North First Street 2 Beijing 100190 P.R.China
- School of Chemistry and Chemical Engineering; Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education; Sun Yat-sen University; No. 135, Xingang Xi Road Guangzhou 510275 P.R.China
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Murphy RP, Kelley E, Rogers SA, Sullivan MO, Epps TH. Unlocking Chain Exchange in Highly Amphiphilic Block Polymer Micellar Systems: Influence of Agitation. ACS Macro Lett 2014; 3:1106-1111. [PMID: 25642383 PMCID: PMC4307907 DOI: 10.1021/mz500435d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Accepted: 10/07/2014] [Indexed: 12/22/2022]
Abstract
Chain exchange between block polymer micelles in highly selective solvents, such as water, is well-known to be arrested under quiescent conditions, yet this work demonstrates that simple agitation methods can induce rapid chain exchange in these solvents. Aqueous solutions containing either pure poly(butadiene-b-ethylene oxide) or pure poly(butadiene-b-ethylene oxide-d4) micelles were combined and then subjected to agitation by vortex mixing, concentric cylinder Couette flow, or nitrogen gas sparging. Subsequently, the extent of chain exchange between micelles was quantified using small angle neutron scattering. Rapid vortex mixing induced chain exchange within minutes, as evidenced by a monotonic decrease in scattered intensity, whereas Couette flow and sparging did not lead to measurable chain exchange over the examined time scale of hours. The linear kinetics with respect to agitation time suggested a surface-limited exchange process at the air-water interface. These findings demonstrate the strong influence of processing conditions on block polymer solution assemblies.
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Affiliation(s)
| | | | - Simon A. Rogers
- Department
of Chemical and
Biomolecular Engineering, University of
Delaware, 150 Academy
Street, Newark, Delaware 19716, United States
| | - Millicent O. Sullivan
- Department
of Chemical and
Biomolecular Engineering, University of
Delaware, 150 Academy
Street, Newark, Delaware 19716, United States
| | - Thomas H. Epps
- Department
of Chemical and
Biomolecular Engineering, University of
Delaware, 150 Academy
Street, Newark, Delaware 19716, United States
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