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Jun T, Park H, Kim J, Lee W, Ahn H, Jang WD, Lee B, Ryu DY. Impact of peripheral alkyl chain length on mesocrystal assemblies of G2 dendrons. NANOSCALE 2023; 15:9069-9075. [PMID: 37158020 DOI: 10.1039/d3nr01243c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Unique sphere-packing mesophases such as Frank-Kasper (FK) phases have emerged from the viable design of intermolecular interactions in supramolecular assemblies. Herein, a series of Cn-G2-CONH2 dendrons possessing an identical core wedge are investigated to elucidate the impact of peripheral alkyl chain lengths (Cn) on the formation of the close-packed structures. The C18 and C14 dendrons, of which the contour lengths of the periphery Lp are longer than the wedge length Lw, assemble into a uniform sphere-packing phase such as body-centred cubic (BCC), whereas the C8 dendron with short (Lp < Lw) corona environment forms the FK A15 phase. Particularly in the intermediate C12 and C10 dendrons (Lp ≈ Lw), cooling the samples from an isotropic state leads to cooling-rate-dependent phase behaviours. The C12 dendron produces two structures of hexagonal columnar and sphere-packing phases (BCC and A15), while the C10 dendron generates the A15 and σ phases by the fast- and slow-cooling processes, respectively. Our results show the impact of peripheral alkyl chain lengths on the formation of mesocrystal phases, where the energy landscape of the dendrons at Lp/Lw ≈ 1 must be more complex and delicate than those with either longer or shorter peripheral alkyl chains.
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Affiliation(s)
- Taesuk Jun
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
| | - Hyunjun Park
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
| | - Junsu Kim
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
| | - Wooseop Lee
- Industry Technology Convergence Centre, Pohang Accelerator Laboratory, 80 Jigok-ro, Nam-gu, Pohang 37673, Korea
| | - Hyungju Ahn
- Industry Technology Convergence Centre, Pohang Accelerator Laboratory, 80 Jigok-ro, Nam-gu, Pohang 37673, Korea
| | - Woo-Dong Jang
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
| | - Byeongdu Lee
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
| | - Du Yeol Ryu
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
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2
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Islam MS, Wakabayashi R, Kimura T. Enhanced γ-phase crystallinity of Al 2O 3 frameworks at the concave surface of PS- b-PEO templated spherical pores. Dalton Trans 2021; 50:7191-7197. [PMID: 33871514 DOI: 10.1039/d1dt00719j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystallinity of inorganic solids like metal oxides after the porosity design is the crucial factor that should be investigated for enhancing their physicochemical properties. In most cases, metal oxide frameworks around mesopores, that are designed through the supramolecular mediated approach, are resulted to be amorphous. Accordingly, a rational guideline has been required for enhancing the crystallinity of frameworks at such concave surfaces. We have so far surveyed a crystallization behavior of alumina (Al2O3) frameworks to its γ-phase around spherical mesopores (∼40 nm) and discussed further transition to the α-phase around much larger pores (∼200 nm). In this paper, we prepared new and helpful Al2O3 powders having PS-b-PEO templated pores (∼25 nm and ∼75 nm) smaller than those of our previous case. After careful discussion of the pore size variation by considering the molecular structure of PS-b-PEO, we explained the crystallization behavior of the Al2O3 frameworks to enhance its γ-crystallinity. This knowledge is quite beneficial for designing highly porous Al2O3 powders with abundant crystallinity for use as catalyst supports, which is very useful for assessing synthetic procedures of other mesoporous metal oxides having high crystallinity.
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Affiliation(s)
- Md Saidul Islam
- Innovative Functional Material Research institute, National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Ryutaro Wakabayashi
- Innovative Functional Material Research institute, National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Tatsuo Kimura
- Innovative Functional Material Research institute, National Institute of Advanced Industrial Science and Technology (AIST), Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
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3
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Xi S, Wang L, Liu J, Chapman W. Thermodynamics, Microstructures, and Solubilization of Block Copolymer Micelles by Density Functional Theory. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5081-5092. [PMID: 30855146 DOI: 10.1021/acs.langmuir.8b04336] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Block copolymer micelle is one of the most versatile self-assembled structures with applications in drug delivery, cosmetic products, and micellar-enhanced ultrafiltration. The key to design an effective block copolymer to form micelles is to understand how molecular architecture affects critical micelle concentrations, micellar dimensions, and partitioning of solute into the micelle. In this work, we studied micelles from nonionic block copolymers using interfacial statistical associating fluid theory a density functional theory, which explicitly includes block copolymer-water hydrogen bonding and water-water hydrogen bonding. We are able to predict and explain how micellar thermodynamic properties depend on polymer chain architecture. Dimension and aggregation of micelles are investigated for block copolymers with different hyrophobes and hydrophiles. The effects of temperature and pressure on micelle stability are also captured by the theory. The enhanced solubility of hydrophobic substance in water by micelle loading is demonstrated, and predicted solute distribution answers the question about the locus of benzene in micelles from a theoretical perspective.
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Affiliation(s)
- Shun Xi
- Department of Chemical and Biomolecular Engineering , Rice University , Houston , Texas 77005 , United States
| | - Le Wang
- Department of Chemical and Biomolecular Engineering , Rice University , Houston , Texas 77005 , United States
| | - Jinlu Liu
- Department of Chemical and Biomolecular Engineering , Rice University , Houston , Texas 77005 , United States
| | - Walter Chapman
- Department of Chemical and Biomolecular Engineering , Rice University , Houston , Texas 77005 , United States
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4
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Mocan M, Kamperman M, Leermakers FAM. Microphase Segregation of Diblock Copolymers Studied by the Self-Consistent Field Theory of Scheutjens and Fleer. Polymers (Basel) 2018; 10:polym10010078. [PMID: 30966118 PMCID: PMC6414839 DOI: 10.3390/polym10010078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 01/08/2018] [Accepted: 01/09/2018] [Indexed: 11/24/2022] Open
Abstract
We used the self-consistent field (SCF) formalism of Scheutjens and Fleer (SF-SCF) to complement existing theoretical investigations on the phase behavior of block copolymer melts. This method employs the freely jointed chain (FJC) model for finite chain length and systematic differences exist compared to the classical SCF predictions. We focus on the critical and hexagonal (HEX) to lamellar (LAM) phase transition region at intermediate and strong segregations. Chain length (N) dependence of the critical point (χcr) was found to be χcrN=10.495(1+4/N). The characteristic spacing (D) of LAM was found as D=4/3N at the critical conditions. We present SF-SCF predictions for the phases single gyroid (SG), double gyroid (DG) and hexagonally perforated lamellar (HPL), in the region where HEX and LAM compete. At χN=30, N=300; we found SG and HPL were metastable with respect to LAM or HEX, DG was stable in a narrow region of the asymmetry ratio. In contrast to the latest predictions, at strong segregation χN=120, DG was found to be metastable. From the structural evolution of HPL, we speculate that this may be an intermediate phase that allows the system to go through various connectivity regimes between minority and majority blocks.
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Affiliation(s)
- Merve Mocan
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
| | - Marleen Kamperman
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
| | - Frans A M Leermakers
- Physical Chemistry and Soft Matter, Wageningen University, Stippeneng 4, 6708 WE Wageningen, The Netherlands.
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Lísal M, Šindelka K, Suchá L, Limpouchová Z, Procházka K. Dissipative particle dynamics simulations of polyelectrolyte self-assemblies. Methods with explicit electrostatics. POLYMER SCIENCE SERIES C 2017. [DOI: 10.1134/s1811238217010052] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Litmanovich EA, Chernikova EV, Zhirnov AE. Influence of chain microstructure of acrylic acid and 4-vinylpyridine copolymers on their aggregative stability and adsorption from aqueous solutions. POLYMER SCIENCE SERIES C 2017. [DOI: 10.1134/s1811238217010064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Šindelka K, Limpouchová Z, Lísal M, Procházka K. The electrostatic co-assembly in non-stoichiometric aqueous mixtures of copolymers composed of one neutral water-soluble and one polyelectrolyte (either positively or negatively charged) block: a dissipative particle dynamics study. Phys Chem Chem Phys 2016; 18:16137-51. [DOI: 10.1039/c6cp01047d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrostatic co-assembly in non-stoichiometric aqueous mixtures of diblock copolymers.
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Affiliation(s)
- Karel Šindelka
- Department of Physical and Macromolecular Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
| | - Zuzana Limpouchová
- Department of Physical and Macromolecular Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
| | - Martin Lísal
- Laboratory of Aerosols Chemistry and Physics
- Institute of Chemical Process Fundamentals of the CAS
- 165 02 Prague 6-Suchdol
- Czech Republic
- Department of Physics
| | - Karel Procházka
- Department of Physical and Macromolecular Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
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8
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Lísal M, Limpouchová Z, Procházka K. The self-assembly of copolymers with one hydrophobic and one polyelectrolyte block in aqueous media: a dissipative particle dynamics study. Phys Chem Chem Phys 2016; 18:16127-36. [DOI: 10.1039/c6cp00341a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reversible self-assembly of copolymers with one hydrophobic and one polyelectrolyte block.
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Affiliation(s)
- Martin Lísal
- Laboratory of Aerosols Chemistry and Physics
- Institute of Chemical Process Fundamentals of the CAS
- v. v. i
- 165 02 Prague 6-Suchdol
- Czech Republic
| | - Zuzana Limpouchová
- Department of Physical and Macromolecular Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
| | - Karel Procházka
- Department of Physical and Macromolecular Chemistry
- Faculty of Science
- Charles University in Prague
- 128 40 Prague 2
- Czech Republic
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9
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The vesicle formation of β-CD and AD self-assembly of dumbbell-shaped amphiphilic triblock copolymer. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3758-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Lei Z, Miao B, Yang S, Chen EQ. Curvature elasticity of a grafted polyelectrolyte brush. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:062602. [PMID: 26172729 DOI: 10.1103/physreve.91.062602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Indexed: 06/04/2023]
Abstract
The curvature elasticity of a polyelectrolyte brush monolayer attached to curved surface is investigated theoretically. An analytical method based on the strong-stretching theory for a Gaussian chain is developed to calculate the elastic modulus induced by a polyelectrolyte brush. In particular, the scaling relations for the bending or Gaussian modulus with respect to system parameters related to the electrostatic interaction (degree of ionization and salt concentration) are derived. Using the numerical self-consistent-field theory, the inner structural, free-energy, and elastic moduli are computed for the polyelectrolyte brush with excluded-volume interactions. Compared to the analytical result, the curvature elasticity has a weaker dependence on the system parameters, which is attributed to the linearization for the Poisson-Boltzmann equation in the analytical treatment. Furthermore, our results are compared to the curvature elasticity of a bare charged surface, wherefrom the unique polyelectrolyte brush effect on the surface elasticity is clarified clearly. The scaling relations derived in our paper can serve as a guide to experimental studies on the related systems.
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Affiliation(s)
- Zhen Lei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Bing Miao
- College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuang Yang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Er-Qiang Chen
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
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11
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Lysenko EA, Kulebyakina AI, Chelushkin PS, Rumyantsev AM, Kramarenko EY, Zezin AB. Polymer micelles with hydrophobic core and ionic amphiphilic corona. 1. Statistical distribution of charged and nonpolar units in corona. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:17108-17117. [PMID: 23137284 DOI: 10.1021/la3026039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Polymer micelles with hydrophobic polystyrene (PS) core and ionic amphiphilic corona from charged N-ethyl-4-vinylpyridinium bromide (EVP) and uncharged 4-vinylpyridine (4VP) units spontaneously self-assembled from PS-block-poly(4VP-stat-EVP) macromolecules in mixed dimethylformamide/methanol/water solvent. The fraction of statistically distributed EVP units in corona-forming block is β = [EVP]/([EVP]+[4VP]) = 0.3-1. Micelles were transferred into water via dialysis technique, and pH was adjusted to 9, where 4VP is insoluble. Structural characteristics of micelles were investigated both experimentally and theoretically as a function of corona composition β. Methods of dynamic and static light scattering, electrophoretic mobility measurements, sedimentation velocity, transmission electron microscopy, and UV spectrophotometry were applied. All micelles possessed spherical morphology. The aggregation number, structure, and electrophoretic mobility of micelles changed in a jumplike manner near β ~ 0.6-0.75. Below and above this region, micelle characteristics were constant or insignificantly changed upon β. Theoretical dependencies for micelle aggregation number, corona dimensions, and fraction of small counterions outside corona versus β were derived via minimization the micelle free energy, taking into account surface, volume, electrostatic, and elastic contributions of chain units and translational entropy of mobile counterions. Theoretical estimations also point onto a sharp structural transition at a certain corona composition. The abrupt reorganization of micelle structure at β ~ 0.6-0.75 entails dramatic changes in micelle dispersion stability in the presence of NaCl or in the presence of oppositely charged polymeric (sodium polymethacrylate) or amphiphilic (sodium dodecyl sulfate) complexing agents.
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Affiliation(s)
- Evgeny A Lysenko
- Chair of Polymer Sciences, Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
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12
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Zhulina EB, Borisov OV. Theory of Block Polymer Micelles: Recent Advances and Current Challenges. Macromolecules 2012. [DOI: 10.1021/ma300195n] [Citation(s) in RCA: 187] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- E. B. Zhulina
- Institute
of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russia
| | - O. V. Borisov
- Institute
of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russia
- Institut Pluridisciplinaire de Recherche sur l’Environnement
et les Matériaux, UMR 5254, UPPA CNRS, 64053 Pau, France
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13
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Lysenko EA, Kulebyakina AI, Grinevich RS, Chelushkin PS, Zezin AB. Influence of a strong polyelectrolyte block on the formation and properties of polymer micelles with a mixed corona. POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x12040050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Lysenko EA, Kulebyakina AI, Chelushkin PS, Zezin AB. Block copolymer micelles with a mixed amphiphilic corona composed of polyelectrolyte and uncharged blocks. DOKLADY PHYSICAL CHEMISTRY 2011. [DOI: 10.1134/s0012501611100010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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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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16
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Kulebyakina AI, Lysenko EA, Chelushkin PS, Kabanov AV, Zezin AB. Self-assembly of an amphiphilic diblock copolymer in aqueous solutions: Effect of linear charge density of an ionogenic block. POLYMER SCIENCE SERIES A 2010. [DOI: 10.1134/s0965545x10060027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Victorov AI, Plotnikov NV, Hong PD. Molecular Thermodynamic Modeling of the Morphology Transitions in a Solution of a Diblock Copolymer Containing a Weak Polyelectrolyte Chain. J Phys Chem B 2010; 114:8846-60. [DOI: 10.1021/jp100987h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexey I. Victorov
- Department of Chemistry, St. Petersburg State University, Universitetsky Prosp., 26, 198504, St. Petersburg, Russia, Department of Chemistry, University of Southern California, 3620 McClintock Avenue, 418 SGM, Los Angeles, California 90089, and Department of Polymer Engineering, National Taiwan University of Science and Technology 43, Section 4, Keelung Road, Taipei 10607, Taiwan
| | - Nikolay V. Plotnikov
- Department of Chemistry, St. Petersburg State University, Universitetsky Prosp., 26, 198504, St. Petersburg, Russia, Department of Chemistry, University of Southern California, 3620 McClintock Avenue, 418 SGM, Los Angeles, California 90089, and Department of Polymer Engineering, National Taiwan University of Science and Technology 43, Section 4, Keelung Road, Taipei 10607, Taiwan
| | - Po-Da Hong
- Department of Chemistry, St. Petersburg State University, Universitetsky Prosp., 26, 198504, St. Petersburg, Russia, Department of Chemistry, University of Southern California, 3620 McClintock Avenue, 418 SGM, Los Angeles, California 90089, and Department of Polymer Engineering, National Taiwan University of Science and Technology 43, Section 4, Keelung Road, Taipei 10607, Taiwan
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18
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Santo KP, Kovalenko A, Stepanova M. Self-Consistent Field Modeling of Three-Dimensional Morphologies of Branched Lipid Surfactant at Air-Water Interface. MACROMOL THEOR SIMUL 2010. [DOI: 10.1002/mats.200900076] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Xu L, Zhu Z, Borisov OV, Zhulina EB, Sukhishvili SA. pH-triggered block copolymer micelle-to-micelle phase transition. PHYSICAL REVIEW LETTERS 2009; 103:118301. [PMID: 19792404 DOI: 10.1103/physrevlett.103.118301] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2009] [Indexed: 05/16/2023]
Abstract
We present a first experimental observation and provide a theoretical interpretation of a pH-induced micelle-to-micelle phase transition in aqueous solutions of spherical block copolymer micelles with polybasic coronas. Dynamic light scattering, static light scattering, and atomic force microscopy confirm sharp changes in micellar hydrodynamic size and aggregation number occurring in a narrow pH range, DeltapH<0.1. In agreement with theory, zeta potential measurements indicated an abrupt change in ionization of polymer chains in the micellar corona at the transition pH.
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Affiliation(s)
- Li Xu
- Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA
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20
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Lauw Y. Equilibrium morphologies of nonionic lipid–nanoparticle mixtures in water: A self-consistent mean-field prediction. J Colloid Interface Sci 2009; 332:491-6. [DOI: 10.1016/j.jcis.2008.12.053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Revised: 12/03/2008] [Accepted: 12/18/2008] [Indexed: 10/21/2022]
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21
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Lauw Y, Kovalenko A, Stepanova M. Phase Behavior of Amphiphilic Lipid Molecules at Air−Water Interfaces: An Off-Lattice Self-Consistent-Field Modeling. J Phys Chem B 2008; 112:2119-27. [DOI: 10.1021/jp077672x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Lauw
- Departments of Mechanical Engineering and Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, and National Institute for Nanotechnology NRC, 11421 Saskatchewan Drive, Edmonton, Alberta, Canada
| | - A. Kovalenko
- Departments of Mechanical Engineering and Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, and National Institute for Nanotechnology NRC, 11421 Saskatchewan Drive, Edmonton, Alberta, Canada
| | - M. Stepanova
- Departments of Mechanical Engineering and Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, and National Institute for Nanotechnology NRC, 11421 Saskatchewan Drive, Edmonton, Alberta, Canada
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22
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Sprakel J, Leermakers FAM, Cohen Stuart MA, Besseling NAM. Comprehensive theory for star-like polymer micelles; combining classical nucleation and polymer brush theory. Phys Chem Chem Phys 2008; 10:5308-16. [DOI: 10.1039/b805664a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Sprakel J, Besseling NAM, Leermakers FAM, Stuart MAC. Micellization of Telechelic Associative Polymers: Self-Consistent Field Modeling and Comparison with Scaling Concepts. J Phys Chem B 2007; 111:2903-9. [PMID: 17319716 DOI: 10.1021/jp0683768] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present numerical results from self-consistent field calculations on the micellization of telechelic associative polymers and their mono-functional analogues. These results are confronted with relatively simple scaling concepts. The proportionality of the critical micelle concentration (CMC) with the hydrophilic backbone length, as found in the calculations, shows good correspondence with a scaling argument based on the entropic penalty of loop formation. It is also shown that models for the conformation of spherical brushes can be applied to predict the structure of the flowerlike micelles formed by these telechelic polymers. Furthermore, we find good agreement between the numerical dependence of the aggregation number upon both backbone and terminal hydrophobe length and an analytical expression derived from the well-known Daoud-Cotton model by introducing a correction for the finite size of the micellar core.
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Affiliation(s)
- J Sprakel
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB, Wageningen, The Netherlands
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Mercurieva AA, Iakovlev P, Zhulina EB, Birshtein TM, Leermakers FAM. Wetting phase diagrams of a polyacid brush with a triple point. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:031803. [PMID: 17025659 DOI: 10.1103/physreve.74.031803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Indexed: 05/12/2023]
Abstract
The (pre)wetting behavior of an annealed polyelectrolyte (PE) brush by an electrolyte solution that is strongly segregated from an apolar phase is analyzed. In this complex interface, there are interactions on various length scales. There are short-range interactions with the (uncharged) surface, and there are interactions on the length scale of the brush height. Using either the ionic strength or the water-surface interaction strength as the control parameters, it is possible to approach and induce a wetting transition in this system. The first-order wetting transition, promoted by favorable short-range substrate interactions with the surface, is in competition with the wetting transition controlled by the detachment of the fluid interface from the periphery of the PE brush. The electric double layer on top of the PE brush contributes with a repulsive forces to the disjoining pressure that tends to thicken the wetting film, and therefore, the transition in all cases is first order. Various phase portraits of the wetting phase diagram are envisioned. One of these features the crossing of two prewetting lines. At the crossing point three surface states coexist. This triple point is analyzed in some detail with the help of a molecular-level self-consistent field model.
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Affiliation(s)
- A A Mercurieva
- Institute of Macromolecular Compounds, St. Petersburg 1990004, Russia
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