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Tang JD, Mura C, Lampe KJ. Stimuli-Responsive, Pentapeptide, Nanofiber Hydrogel for Tissue Engineering. J Am Chem Soc 2019; 141:4886-4899. [PMID: 30830776 DOI: 10.1021/jacs.8b13363] [Citation(s) in RCA: 167] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Short peptides are uniquely versatile building blocks for self-assembly. Supramolecular peptide assemblies can be used to construct functional hydrogel biomaterials-an attractive approach for neural tissue engineering. Here, we report a new class of short, five-residue peptides that form hydrogels with nanofiber structures. Using rheology and spectroscopy, we describe how sequence variations, pH, and peptide concentration alter the mechanical properties of our pentapeptide hydrogels. We find that this class of seven unmodified peptides forms robust hydrogels from 0.2-20 kPa at low weight percent (less than 3 wt %) in cell culture media and undergoes shear-thinning and rapid self-healing. The peptides self-assemble into long fibrils with sequence-dependent fibrillar morphologies. These fibrils exhibit a unique twisted ribbon shape, as visualized by transmission electron microscopy (TEM) and Cryo-EM imaging, with diameters in the low tens of nanometers and periodicities similar to amyloid fibrils. Experimental gelation behavior corroborates our molecular dynamics simulations, which demonstrate peptide assembly behavior, an increase in β-sheet content, and patterns of variation in solvent accessibility. Our rapidly assembling pentapeptides for injectable delivery (RAPID) hydrogels are syringe-injectable and support cytocompatible encapsulation of oligodendrocyte progenitor cells (OPCs), as well as their proliferation and three-dimensional process extension. Furthermore, RAPID gels protect OPCs from mechanical membrane disruption and acute loss of viability when ejected from a syringe needle, highlighting the protective capability of the hydrogel as potential cell carriers for transplantation therapies. The tunable mechanical and structural properties of these supramolecular assemblies are shown to be permissive to cell expansion and remodeling, making this hydrogel system suitable as an injectable material for cell delivery and tissue engineering applications.
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Lombardo D, Munaò G, Calandra P, Pasqua L, Caccamo MT. Evidence of pre-micellar aggregates in aqueous solution of amphiphilic PDMS-PEO block copolymer. Phys Chem Chem Phys 2019; 21:11983-11991. [PMID: 31134980 DOI: 10.1039/c9cp02195g] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The self-assembly process in a water solution of an amphiphilic polydimethylsiloxane-b-polyethyleneoxide (PDMS-PEO) diblock copolymer was investigated by means of small-angle X-ray scattering (SAXS) experiments in the concentration region below (and near) the critical micellar concentration (c.m.c. = 0.007 g cm-3). In the highly diluted region, at the copolymer concentration of c = 0.002 g cm-3, the early stage of the self-assembly process was characterized by the formation of small (primary) micellar units (with a radius of R = 2.7 nm) with core-shell morphology, which coexisted with larger supramolecular aggregates of entangled micelles (with an average radius of R = 9.5 nm). The increase in the copolymer concentration (to c = 0.005 and c = 0.01 g cm-3) caused increase in the sizes of both the small micelles and supra-micellar aggregates. Interestingly, at the concentration of c = 0.005 g cm-3, both the size and micelle aggregation number (Nagg) were found to increase on increasing the temperature in the range of 10 ≤ T ≤ 55 °C. This phenomenon was characterised by the dehydration process of the ethylene oxide (EO) segments, as evidenced by the calculation of excess water in the hydrophilic shell of the micelles. The more compact (less hydrated) structure of the hydrophilic PEO chains, which strongly influenced the spontaneous curvature of the amphiphile hydrophilic region, turned out to be the driving factor that favoured the increase in the micelle aggregation number with the increase in temperature. The obtained results evidence that the self-assembly process of PDMS-PEO copolymer amphiphiles is a gradual process that is already present at the very low concentration region (far below the macroscopically determined c.m.c.); moreover, it is characterised by a multi-stage organization process, where the primary building blocks self-assemble into more complex secondary structures that encompass multiple length scales.
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Affiliation(s)
- Domenico Lombardo
- CNR-IPCF, Istituto per i Processi Chimico Fisici - (Sez. Messina) Viale, F. Stagno D'Alcontres, 37, I-98158, Messina, Italy.
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Kim K, Arora A, Lewis RM, Liu M, Li W, Shi AC, Dorfman KD, Bates FS. Origins of low-symmetry phases in asymmetric diblock copolymer melts. Proc Natl Acad Sci U S A 2018; 115:847-854. [PMID: 29348199 PMCID: PMC5798371 DOI: 10.1073/pnas.1717850115] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cooling disordered compositionally asymmetric diblock copolymers leads to the formation of nearly spherical particles, each containing hundreds of molecules, which crystallize upon cooling below the order-disorder transition temperature (TODT). Self-consistent field theory (SCFT) reveals that dispersity in the block degrees of polymerization stabilizes various Frank-Kasper phases, including the C14 and C15 Laves phases, which have been accessed experimentally in low-molar-mass poly(isoprene)-b-poly(lactide) (PI-PLA) diblock copolymers using thermal processing strategies. Heating and cooling a specimen containing 15% PLA above and below the TODT from the body-centered cubic (BCC) or C14 states regenerates the same crystalline order established at lower temperatures. This memory effect is also demonstrated with a specimen containing 20% PLA, which recrystallizes to either C15 or hexagonally ordered cylinders (HEXC) upon heating and cooling. The process-path-dependent formation of crystalline order shapes the number of particles per unit volume, n/V, which is retained in the highly structured disordered liquid as revealed by small-angle X-ray scattering (SAXS) experiments. We hypothesize that symmetry breaking during crystallization is governed by the particle number density imprinted in the liquid during ordering at lower temperature, and this metastable liquid is kinetically constrained from equilibrating due to prohibitively large free energy barriers for micelle fusion and fission. Ordering at fixed n/V is enabled by facile chain exchange, which redistributes mass as required to meet the multiple particle sizes and packing associated with specific low-symmetry Frank-Kasper phases. This discovery exposes universal concepts related to order and disorder in self-assembled soft materials.
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Affiliation(s)
- Kyungtae Kim
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
| | - Akash Arora
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
| | - Ronald M Lewis
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
| | - Meijiao Liu
- Department of Chemistry, Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Weihua Li
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - An-Chang Shi
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
| | - Kevin D Dorfman
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
| | - Frank S Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455;
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O'Bryan CS, Bhattacharjee T, Hart S, Kabb CP, Schulze KD, Chilakala I, Sumerlin BS, Sawyer WG, Angelini TE. Self-assembled micro-organogels for 3D printing silicone structures. SCIENCE ADVANCES 2017; 3:e1602800. [PMID: 28508071 PMCID: PMC5425239 DOI: 10.1126/sciadv.1602800] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 03/09/2017] [Indexed: 05/18/2023]
Abstract
The widespread prevalence of commercial products made from microgels illustrates the immense practical value of harnessing the jamming transition; there are countless ways to use soft, solid materials that fluidize and become solid again with small variations in applied stress. The traditional routes of microgel synthesis produce materials that predominantly swell in aqueous solvents or, less often, in aggressive organic solvents, constraining ways that these exceptionally useful materials can be used. For example, aqueous microgels have been used as the foundation of three-dimensional (3D) bioprinting applications, yet the incompatibility of available microgels with nonpolar liquids, such as oils, limits their use in 3D printing with oil-based materials, such as silicone. We present a method to make micro-organogels swollen in mineral oil, using block copolymer self-assembly. The rheological properties of this micro-organogel material can be tuned, leveraging the jamming transition to facilitate its use in 3D printing of silicone structures. We find that the minimum printed feature size can be controlled by the yield stress of the micro-organogel medium, enabling the fabrication of numerous complex silicone structures, including branched perfusable networks and functional fluid pumps.
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Affiliation(s)
- Christopher S O'Bryan
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Tapomoy Bhattacharjee
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Samuel Hart
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Christopher P Kabb
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Kyle D Schulze
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Indrasena Chilakala
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Brent S Sumerlin
- Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - W Gregory Sawyer
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
- Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
| | - Thomas E Angelini
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611, USA
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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: 14] [Impact Index Per Article: 1.6] [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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Zinn T, Willner L, Lund R, Pipich V, Appavou MS, Richter D. Surfactant or block copolymer micelles? Structural properties of a series of well-defined n-alkyl-PEO micelles in water studied by SANS. SOFT MATTER 2014; 10:5212-20. [PMID: 24916456 DOI: 10.1039/c4sm00625a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Here we present an extensive small-angle neutron scattering (SANS) structural characterization of micelles formed by poly(ethylene oxide)-mono-n-alkyl ethers (Cn-PEOx) in dilute aqueous solution. Chemically, Cn-PEOx can be considered as a hybrid between a low-molecular weight surfactant and an amphiphilic block copolymer. The present system, prepared through anionic polymerization techniques, is better defined than other commercially available polymers and allows a very precise and systematic testing of the theoretical predictions from thermodynamical models. The equilibrium micellar properties were elaborated by systematically varying the n-alkyl chain length (n) at constant PEO molecular weight or increasing the soluble block size (x), respectively. The structure was reminiscent of typical spherical star-like micelles i.e. a constant core density profile, ∼r(0), and a diffuse corona density profile, ∼r(-4/3). Through a careful quantitative analysis of the scattering data, it is found that the aggregation number, Nagg initially rapidly decreases with increasing PEO length until it becomes independent at higher PEO molecular weight as expected for star-like micelles. On the other hand, the dependency on the n-alkyl length is significantly stronger than that expected from the theories for star-like block copolymer micelles, Nagg ∼ n(2) similar to what is expected for surfactant micelles. Hence the observed aggregation behavior suggests that the Cn-PEOx micelles exhibit a behavior that can be considered as a hybrid between low-molecular weight surfactant micelles and diblock copolymer micelles.
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Affiliation(s)
- Thomas Zinn
- Jülich Centre for Neutron Science JCNS and Institute for Complex Systems ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
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Lund R, Willner L, Richter D. Kinetics of Block Copolymer Micelles Studied by Small-Angle Scattering Methods. CONTROLLED POLYMERIZATION AND POLYMERIC STRUCTURES 2013. [DOI: 10.1007/12_2012_204] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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9
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Kessel S, Truong NP, Jia Z, Monteiro MJ. Aqueous reversible addition-fragmentation chain transfer dispersion polymerization of thermoresponsive diblock copolymer assemblies: Temperature directed morphology transformations. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26313] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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Lin YL, Wu MZ, Sheng YJ, Tsao HK. Effects of molecular architectures and solvophobic additives on the aggregative properties of polymeric surfactants. J Chem Phys 2012; 136:104905. [DOI: 10.1063/1.3693514] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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11
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Lonsdale DE, Monteiro MJ. Synthesis and self-assembly of amphiphilic macrocyclic block copolymer topologies. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24935] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Nanopatterning by block copolymer micelle nanolithography and bioinspired applications. Biointerphases 2011; 6:MR1-12. [DOI: 10.1116/1.3536839] [Citation(s) in RCA: 109] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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13
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Chou SH, Tsao HK, Sheng YJ. Structural aggregates of rod–coil copolymer solutions. J Chem Phys 2011; 134:034904. [DOI: 10.1063/1.3537977] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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14
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Borisov OV, Zhulina EB, Leermakers FAM, Müller AHE. Self-Assembled Structures of Amphiphilic Ionic Block Copolymers: Theory, Self-Consistent Field Modeling and Experiment. SELF ORGANIZED NANOSTRUCTURES OF AMPHIPHILIC BLOCK COPOLYMERS I 2011. [DOI: 10.1007/12_2011_114] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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15
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Akiba I, Terada N, Hashida S, Sakurai K, Sato T, Shiraishi K, Yokoyama M, Masunaga H, Ogawa H, Ito K, Yagi N. Encapsulation of a hydrophobic drug into a polymer-micelle core explored with synchrotron SAXS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7544-7551. [PMID: 20361731 DOI: 10.1021/la904355p] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Synchrotron small-angle X-ray scattering (SAXS) at the SPring-8 40B2 and 45XU beamlines was carried out on aqueous solutions of (PEG-P(Asp(Bzl))): partially benzyl-esterified poly(ethylene glycol)-block-poly(aspartic acid) with LE540 loaded up to 8.3 wt %, where LE540 is a very hydrophobic retinoid antagonist drug. The scattering profiles showed characteristic features for core-shell spherical micelles, confirming that P(Asp(Bzl)) forms a hydrophobic core and PEG forms a hydrophilic shell. Before the addition of LE540, a diffraction peak was observed around q = 4 nm(-1), where q is the magnitude of the scattering vector. This peak can be attributed to ordering between alpha-helices made of P(Asp(Bzl)), the so-called nonspecific hexatic arrangement. The P(Asp(Bzl)) helices disappeared as LE540 was added. This result can be interpreted by assuming a uniform distribution of LE540 in the core. By use of a core-shell spherical micelle model, the SAXS data could be well fitted for all of the samples. The analysis indicated that the core radius increases sigmoidally from 5.9 to 6.9 nm upon addition of LE540 whereas the shell radius stayed at 12.5-12.8 nm. The aggregation number that is the average number of PEG-P(Asp(Bzl))'s consisting of one micelle slightly increased from 145 to 182.
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Affiliation(s)
- Isamu Akiba
- Department of Chemistry and Biochemistry, The University of Kitakyushu, 1-1 Hibikino, Kitakyushu 808-0135, Japan.
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16
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Lund R. Small Angle Neutron Scattering as a Tool to Study Kinetics of Block Copolymer Micelles. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/978-3-642-03309-4_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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17
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Lin CM, Chen YZ, Sheng YJ, Tsao HK. Effects of macromolecular architecture on the micellization behavior of complex block copolymers. REACT FUNCT POLYM 2009. [DOI: 10.1016/j.reactfunctpolym.2008.12.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Chou SH, Tsao HK, Sheng YJ. Atypical micellization of star-block copolymer solutions. J Chem Phys 2008; 129:224902. [DOI: 10.1063/1.3028045] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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19
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Palyulin VV, Potemkin II. Mixed versus Ordinary Micelles in the Dilute Solution of AB and BC Diblock Copolymers. Macromolecules 2008. [DOI: 10.1021/ma8003949] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir V. Palyulin
- Department of Physics, Moscow State University, Moscow 119992, Russian Federation, Department of Polymer Science, University of Ulm, 89069 Ulm, Germany
| | - Igor I. Potemkin
- Department of Physics, Moscow State University, Moscow 119992, Russian Federation, Department of Polymer Science, University of Ulm, 89069 Ulm, Germany
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20
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Hong L, Zhu F, Li J, Ngai T, Xie Z, Wu C. Folding of Long Multiblock Copolymer (PI-b-PS-b-PI)n Chains Prepared by the Self-Assembly Assisted Polypolymerization (SAAP) in Cyclohexane. Macromolecules 2008. [DOI: 10.1021/ma702079j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Liangzhi Hong
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Fangming Zhu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Junfang Li
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - To Ngai
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Zuowei Xie
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Chi Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, Guangdong, 510275, China, and The Hefei National Laboratory of Physical Science at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China
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21
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Izzo D, Marques CM. Solubilization of homopolymers in a solution of diblock copolymers. J Phys Chem B 2007; 109:6140-5. [PMID: 16851678 DOI: 10.1021/jp050196v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We study theoretically mixed solutions of homopolymer and diblock copolymer chains. The solvent is a poor solvent for the homopolymers and a selective solvent for the copolymers. We find that the formation of copolymer micelles containing also the insoluble chains allows for an increased solubility of the homopolymers in the solution. In agreement with experiments, we find also that the solubilization power of the micelles, that is, the maximum amount of total homopolymer weight solubilized per unit weight of copolymers in solution, decreases strongly with the homopolymer index of polymerization.
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Affiliation(s)
- D Izzo
- Instituto de Física, U.F.R.J., Caixa Postal 68528, 21945-970, Rio de Janeiro, Brazil
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Sheng YJ, Wang TY, Chen WM, Tsao HK. A-B diblock copolymer micelles: effects of soluble-block length and component compatibility. J Phys Chem B 2007; 111:10938-45. [PMID: 17722912 DOI: 10.1021/jp073408s] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Micellization of a diblock copolymer in dilute solution is studied by dissipative particle dynamics. The influence of the compatibility between blocks A and B and the interaction between the insoluble block and solvent on aggregation number P and micellar core radius Rc are examined. The micelle size distribution is obtained, and it is quite polydisperse. Different from the scaling theory for starlike micelles, the mean aggregation number based on weight average <P>w decreases with increasing soluble-block length NA and the power law relation can be obtained, <P>w approximately NA(-alpha). Similarly, the micellar core radius declines with NA, following Rc approximately NA(-beta) with beta=alpha/3. However, the exponent depends on the mutual compatibility between soluble and insoluble blocks. For the same composition, the incompatible diblocks form a smaller micelle and its aggregation number declines with a smaller exponent alpha. When NA approximately NB, the micelles deviate significantly from the spherical shape and solvophilic blocks are observed to be entrapped in the solvophobic core for compatible diblocks.
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Affiliation(s)
- Yu-Jane Sheng
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China
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Larsen AL, Terentjev EM. Spontaneous Curvatures of Copolymer Interfaces in Poor Solvents: Bilayer Morphology. Macromolecules 2006. [DOI: 10.1021/ma061417d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anne L. Larsen
- Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | - Eugene M. Terentjev
- Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
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Cavallo A, Müller M, Binder K. Formation of Micelles in Homopolymer-Copolymer Mixtures: Quantitative Comparison between Simulations of Long Chains and Self-Consistent Field Calculations. Macromolecules 2006. [DOI: 10.1021/ma061493g] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Cavallo
- Institut für Physik, Johannes-Gutenberg-Universität, Staudinger-Weg 7, D-55099 Mainz, Germany, and Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - M. Müller
- Institut für Physik, Johannes-Gutenberg-Universität, Staudinger-Weg 7, D-55099 Mainz, Germany, and Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
| | - K. Binder
- Institut für Physik, Johannes-Gutenberg-Universität, Staudinger-Weg 7, D-55099 Mainz, Germany, and Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany
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Pan LH, Singh MA, Salomons GJ, Gupta JA, Capel MS. Strain energy effects on the ordering process in diblock styrene-butadiene copolymer. J MACROMOL SCI B 2006. [DOI: 10.1080/00222349708220420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- L. H. Pan
- a Department of Physics , Queen's University , Kingston, Ontario, Canada , K7L 3N6
- c Sunnybrook Health Science Centre , 2075 Bayview Ave., North York, ON, Canada , M4N 3M5
| | - M. A. Singh
- a Department of Physics , Queen's University , Kingston, Ontario, Canada , K7L 3N6
| | - G. J. Salomons
- a Department of Physics , Queen's University , Kingston, Ontario, Canada , K7L 3N6
| | - J. A. Gupta
- a Department of Physics , Queen's University , Kingston, Ontario, Canada , K7L 3N6
| | - M. S. Capel
- b Brookhaven National Laboratory , Upton, New York, 11973, USA
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Abstract
We analyzed the self-organized supermolecular architectures observed in solutions of singly polymer-substituted fullerenes by light-scattering and fluorescence spectroscopy, as well as the surface pattern obtained from spraying the solution by atomic force microscopy. We found that the concentration dependence on aggregate size and fluorescence intensity can be explained quantitatively using a scaling argument, assuming that the aggregates in solution are self-emulsified micelles. Our results indicate that the core of the structure is unreacted fullerenes. Based on our scaling arguments, we predict that there is a critical molecular weight that allows for a narrow distribution of the self-assembled structures in solution.
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Affiliation(s)
- Qi Liao
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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28
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Zhulina EB, Adam M, LaRue I, Sheiko SS, Rubinstein M. Diblock Copolymer Micelles in a Dilute Solution. Macromolecules 2005. [DOI: 10.1021/ma048102n] [Citation(s) in RCA: 256] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lund R, Willner L, Stellbrink J, Radulescu A, Richter D. Role of Interfacial Tension for the Structure of PEP−PEO Polymeric Micelles. A Combined SANS and Pendant Drop Tensiometry Investigation. Macromolecules 2004. [DOI: 10.1021/ma035633n] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Reidar Lund
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Lutz Willner
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Jörg Stellbrink
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Aurel Radulescu
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Dieter Richter
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany
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30
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Affiliation(s)
- M. Castelnovo
- Institut Charles Sadron, 6 Rue Boussingault, 67083 Strasbourg Cedex, France; Physico-Chimie, Institut Curie, 11 Rue P. et M. Curie, 75231 Paris Cedex 05, France
| | - J. F. Joanny
- Institut Charles Sadron, 6 Rue Boussingault, 67083 Strasbourg Cedex, France; Physico-Chimie, Institut Curie, 11 Rue P. et M. Curie, 75231 Paris Cedex 05, France
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31
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Nose T, Numasawa N. A theory of swollen hollow micelles of diblock copolymers in selective solvents. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1089-3156(00)00018-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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32
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Schädler V, Lindner P, Wiesner U, Mendes E. Ionic and Zwitterionic Model Macromolecular Surfactants. J Phys Chem B 1998. [DOI: 10.1021/jp982041b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Schädler
- Laboratoire de Dynamique des Fluides Complexes-Unité Mixte de Recherche, CNRS-ULP 4, rue Blaise Pascal, F-67070-Strasbourg, France, Max Planck-Institut für Polymerforschung, Postfach 3148, D-55021-Mainz, Germany, and Institut Max von Laue-Paul Langevin 4, av. des Martyrs F-38000-Grenoble, France
| | - P. Lindner
- Laboratoire de Dynamique des Fluides Complexes-Unité Mixte de Recherche, CNRS-ULP 4, rue Blaise Pascal, F-67070-Strasbourg, France, Max Planck-Institut für Polymerforschung, Postfach 3148, D-55021-Mainz, Germany, and Institut Max von Laue-Paul Langevin 4, av. des Martyrs F-38000-Grenoble, France
| | - U. Wiesner
- Laboratoire de Dynamique des Fluides Complexes-Unité Mixte de Recherche, CNRS-ULP 4, rue Blaise Pascal, F-67070-Strasbourg, France, Max Planck-Institut für Polymerforschung, Postfach 3148, D-55021-Mainz, Germany, and Institut Max von Laue-Paul Langevin 4, av. des Martyrs F-38000-Grenoble, France
| | - E. Mendes
- Laboratoire de Dynamique des Fluides Complexes-Unité Mixte de Recherche, CNRS-ULP 4, rue Blaise Pascal, F-67070-Strasbourg, France, Max Planck-Institut für Polymerforschung, Postfach 3148, D-55021-Mainz, Germany, and Institut Max von Laue-Paul Langevin 4, av. des Martyrs F-38000-Grenoble, France
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33
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Lee KY, Jo WH, Kwon IC, Kim YH, Jeong SY. Structural Determination and Interior Polarity of Self-Aggregates Prepared from Deoxycholic Acid-Modified Chitosan in Water. Macromolecules 1998. [DOI: 10.1021/ma9711304] [Citation(s) in RCA: 180] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Lairez D, Adam M, Carton JP, Raspaud E. Aggregation of Telechelic Triblock Copolymers: From Animals to Flowers. Macromolecules 1997. [DOI: 10.1021/ma970666m] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Lairez
- Laboratoire Léon Brillouin, CEA-CNRS, and Service de Physique de l'Etat Condensé CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - M. Adam
- Laboratoire Léon Brillouin, CEA-CNRS, and Service de Physique de l'Etat Condensé CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - J.-P. Carton
- Laboratoire Léon Brillouin, CEA-CNRS, and Service de Physique de l'Etat Condensé CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - E. Raspaud
- Laboratoire Léon Brillouin, CEA-CNRS, and Service de Physique de l'Etat Condensé CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
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Affiliation(s)
- D. Izzo
- Instituto de Física da Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, Brazil, and R.P.-C.N.R.S., Complex Fluids Laboratory UMR166, Cranbury, New Jersey 08512-7500
| | - C. M. Marques
- Instituto de Física da Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21945-970 Rio de Janeiro, Brazil, and R.P.-C.N.R.S., Complex Fluids Laboratory UMR166, Cranbury, New Jersey 08512-7500
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36
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Sens P, Marques CM, Joanny JF. Mixed Micelles in a Bidisperse Solution of Diblock Copolymers. Macromolecules 1996. [DOI: 10.1021/ma951553a] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- P. Sens
- Institut Charles Sadron, CNRS, 6 rue Boussingault, F-67083 Strasbourg, France
| | - C. M. Marques
- Institut Charles Sadron, CNRS, 6 rue Boussingault, F-67083 Strasbourg, France
| | - J.-F. Joanny
- Institut Charles Sadron, CNRS, 6 rue Boussingault, F-67083 Strasbourg, France
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King S, Cosgrove T, Eaglesham A. The adsorption of polystyrene saturated-polydiene block copolymers on silica substrates. Colloids Surf A Physicochem Eng Asp 1996. [DOI: 10.1016/0927-7757(95)03397-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Iatrou H, Willner L, Hadjichristidis N, Halperin A, Richter D. Aggregation Phenomena of Model PS/PI Super-H-Shaped Block Copolymers. Influence of the Architecture. Macromolecules 1996. [DOI: 10.1021/ma9509063] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hermis Iatrou
- Department of Chemistry, The University of Athens, 15771 Athens, Greece, Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, and CRPCSS, 24 av President Kennedy, 68200 Mulhouse, France
| | - Lutz Willner
- Department of Chemistry, The University of Athens, 15771 Athens, Greece, Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, and CRPCSS, 24 av President Kennedy, 68200 Mulhouse, France
| | - Nikos Hadjichristidis
- Department of Chemistry, The University of Athens, 15771 Athens, Greece, Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, and CRPCSS, 24 av President Kennedy, 68200 Mulhouse, France
| | - Avi Halperin
- Department of Chemistry, The University of Athens, 15771 Athens, Greece, Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, and CRPCSS, 24 av President Kennedy, 68200 Mulhouse, France
| | - Dieter Richter
- Department of Chemistry, The University of Athens, 15771 Athens, Greece, Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany, and CRPCSS, 24 av President Kennedy, 68200 Mulhouse, France
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39
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Liu G, Smith CK, Hu N, Tao J. Formation and Properties of Polystyrene-block-poly(2-hydroxyethyl methacrylate) Micelles. Macromolecules 1996. [DOI: 10.1021/ma9503930] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guojun Liu
- Department of Chemistry, University of Calgary, 2500 University Drive, NW, Calgary, Alberta, Canada T2N 1N4
| | - Carl K. Smith
- Department of Chemistry, University of Calgary, 2500 University Drive, NW, Calgary, Alberta, Canada T2N 1N4
| | - Nanxing Hu
- Department of Chemistry, University of Calgary, 2500 University Drive, NW, Calgary, Alberta, Canada T2N 1N4
| | - Jian Tao
- Department of Chemistry, University of Calgary, 2500 University Drive, NW, Calgary, Alberta, Canada T2N 1N4
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40
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Liu G. Chain exchange kinetics of diblock copolymer micelles studied by nonradiative energy transfer. 1. Experimental design and theory. CAN J CHEM 1995. [DOI: 10.1139/v95-246] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A fluorescence experiment involving mixing donor-labeled micelles with acceptor-labeled unimers has been designed and a kinetic scheme for describing such an experiment has been proposed. An approximate analytical solution was found for the decrease in the donor fluorescence intensity at time t after sample mixing relative to that at time zero, I(t)/I(0). Treating the data of this decrease in donor fluorescence intensity as a function of time using the derived equation allows the simultaneous determination of the rate constant kn for unimer incorporation into micelles and the quenching efficiency φ of donor fluorescence by an acceptor in a micelle. Keywords: polymer micelles, dynamics, chain exchange, energy transfer.
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41
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Alexandridis P, Alan Hatton T. Poly(ethylene oxide)poly(propylene oxide)poly(ethylene oxide) block copolymer surfactants in aqueous solutions and at interfaces: thermodynamics, structure, dynamics, and modeling. Colloids Surf A Physicochem Eng Asp 1995. [DOI: 10.1016/0927-7757(94)03028-x] [Citation(s) in RCA: 1523] [Impact Index Per Article: 52.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Jones RL, Spontak RJ. Conformational analysis of double‐tethered chain molecules at an impenetrable interface: A Monte Carlo study. J Chem Phys 1994. [DOI: 10.1063/1.467374] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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