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Dahanayake R, Dormidontova EE. Molecular Structure and Co-solvent Distribution in PPO–PEO and Pluronic Micelles. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Rasika Dahanayake
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut06269, United States
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2
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Dahanayake R, Dormidontova EE. Hydrogen Bonding Sequence Directed Coil-Globule Transition in Water Soluble Thermoresponsive Polymers. Phys Rev Lett 2021; 127:167801. [PMID: 34723603 DOI: 10.1103/physrevlett.127.167801] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The origin of the coil-globule transition for water-soluble thermoresponsive polymers frequently used in nanomaterials remains elusive. Using polypropylene oxide as an example we demonstrate by means of atomistic molecular dynamics simulations that temperature-induced increase in the sequence length of monomers that are not hydrogen bonded to water drives the coil-globule transition. Longer chains statistically exhibit longer sequences which serve as nucleation sites for hydrophobic cluster formation, facilitating chain collapse at lower temperature in agreement with experimental data.
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Affiliation(s)
- Rasika Dahanayake
- 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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3
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Kangarlou B, Dahanayake R, Martin IJ, Ndaya D, Wu CM, Kasi RM, Dormidontova EE, Nieh MP. Flower-like Micelles of Polyethylene Oxide End-Capped with Cholesterol. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Behrad Kangarlou
- Materials Science Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Rasika Dahanayake
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Ian J. Martin
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Dennis Ndaya
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Chun-Ming Wu
- The Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, New South Wales 2234, Australia
| | - Rajeswari M. Kasi
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Elena E. Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Mu-Ping Nieh
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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4
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Aliakseyeu A, Dormidontova EE, Sukhishvili SA. Hydrogen-Bonded Complexes of Star Polymers. Macromol Rapid Commun 2021; 42:e2100097. [PMID: 33864317 DOI: 10.1002/marc.202100097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/22/2021] [Indexed: 01/12/2023]
Abstract
The effect of molecular architecture, star versus linear, poly(ethylene oxide) (PEO) on the formation of hydrogen-bonded complexes with linear poly(methacrylic acid) (PMAA) is investigated experimentally and rationalized theoretically. Isothermal titration calorimetry reveals that at pH 2.5 interpolymer complexes (IPCs) of PMMA with a 6-arm star PEO (sPEO) contains ≈50% more polyacid than IPCs formed with linear PEO (lPEO). While the enthalpy of IPC formation is positive in both cases, its magnitude is ≈50% larger for sPEO/PMAA complexes that exhibit a lower dissociation constant than lPEO/polyacid complexes. These results are rationalized based on a higher localized density of hydrogen bonds formed between sPEO and the polyacid which prevents penetration of star molecules into PMAA coils. Accordingly, Fourier transform infrared results indicate approximately twofold excess of self-associated >COOH units over intermolecularly bonded >COOH units in sPEO-containing complexes. The excess of PMAA chains in IPCs and the percentage of self-associated carboxylic groups in sPEO/PMAA complexes both increase with polyacid molecular weight. Other findings, including a positive entropy, hysteresis in composition at strongly acidic pH, and progressive equilibration of IPCs at increased pH are consistent with the critical role of charge and release of water molecules in the formation of sPEO/PMAA and lPEO/PMAA complexes.
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Affiliation(s)
- Aliaksei Aliakseyeu
- Department of Materials Science & Engineering, Texas A&M University, College Station, TX, 77840, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, CT, 06269, USA
| | - Svetlana A Sukhishvili
- Department of Materials Science & Engineering, Texas A&M University, College Station, TX, 77840, USA
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5
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Rad AT, Bao Y, Jang HS, Xia Y, Sharma H, Dormidontova EE, Zhao J, Arora J, John VT, Tang BZ, Dainese T, Hariri A, Jokerst JV, Maran F, Nieh MP. Aggregation-Enhanced Photoluminescence and Photoacoustics of Atomically Precise Gold Nanoclusters in Lipid Nanodiscs (NANO 2). Adv Funct Mater 2021; 31:2009750. [PMID: 34366760 PMCID: PMC8341053 DOI: 10.1002/adfm.202009750] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Indexed: 05/25/2023]
Abstract
The authors designed a structurally stable nano-in-nano (NANO2) system highly capable of bioimaging via an aggregation-enhanced NIR excited emission and photoacoustic response achieved based on atomically precise gold nanoclusters protected by linear thiolated ligands [Au25(SC n H2n+1)18, n = 4-16] encapsulated in discoidal phospholipid bicelles through a one-pot synthesis. The detailed morphological characterization of NANO2 is conducted using cryogenic transmission electron microscopy, small/wide angle X-ray scattering with the support of molecular dynamics simulations, providing information on the location of Au nanoclusters in NANO2. The photoluminescence observed for NANO2 is 20-60 times more intense than that of the free Au nanoclusters, with both excitation and emission wavelengths in the near-infrared range, and the photoacoustic signal is more than tripled. The authors attribute this newly discovered aggregation-enhanced photoluminescence and photoacoustic signals to the restriction of intramolecular motion of the clusters' ligands. With the advantages of biocompatibility and high cellular uptake, NANO2 is potentially applicable for both in vitro and in vivo imaging, as the authors demonstrate with NIR excited emission from in vitro A549 human lung and the KB human cervical cancer cells.
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Affiliation(s)
- Armin Tahmasbi Rad
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Yue Bao
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Hyun-Sook Jang
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | - Yan Xia
- Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Hari Sharma
- Department of Physics, University of Connecticut, Storrs, CT 06269, USA
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Department of Physics, University of Connecticut, Storrs, CT 06269, USA
| | - Jing Zhao
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Jaspreet Arora
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Vijay T John
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA
| | - Ben Zhong Tang
- Department of Chemistry, the Hong Kong University of Science and Technology, Hong Kong, P. R. China
| | - Tiziano Dainese
- Department of Chemistry, University of Padova, Padova 35131, Italy
| | - Ali Hariri
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Jesse V Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Flavio Maran
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA, Department of Chemistry, University of Padova, Padova 35131, Italy
| | - Mu-Ping Nieh
- Department of Biomedical Engineering, University of Connecticut Storrs, CT 06269, USA; Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA; Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269, USA
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6
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Dahal U, Dormidontova EE. Chain Conformation and Hydration of Polyethylene Oxide Grafted to Gold Nanoparticles: Curvature and Chain Length Effect. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01499] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Udaya Dahal
- 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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7
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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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8
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Affiliation(s)
- Hari Sharma
- 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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9
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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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10
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Affiliation(s)
- Udaya Dahal
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Zilu Wang
- 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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11
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Kwiatkowski AL, Molchanov VS, Sharma H, Kuklin AI, Dormidontova EE, Philippova OE. Growth of wormlike micelles of surfactant induced by embedded polymer: role of polymer chain length. Soft Matter 2018; 14:4792-4804. [PMID: 29808227 DOI: 10.1039/c8sm00776d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Incorporation of polymer chains into wormlike surfactant micelles, which find a large range of applications, offers the opportunity to modify their structure and properties. In this paper, using spectroscopic, scattering and rheological techniques and computer simulations, we study the incorporation of poly(4-vinylpyridine) of two different molecular weights (MWs) into entangled networks of wormlike surfactant micelles of potassium oleate. Using NMR-spectroscopy we show that, independent of its MW, the polymer incorporates into the core-corona interface of the surfactant micelles. According to SANS data, the polymer does not alter the micelle structure or the micelle radius, but diminishes the packing density of the surfactant. At the same time, rheology reveals a stark difference between the surfactant networks with embedded polymers of different MWs. Networks with the higher-MW polymer possess larger viscosity and a longer relaxation time, which we attribute to the larger length of the hybrid micelles. Moreover, we demonstrate that in an intermediate concentration range the higher-MW polymer is able to link neighbouring surfactant micelles together, which has never been previously observed. However, with a further increase in polymer content the micelles become smaller due to the high breaking susceptibility of the boundaries of polymer-containing sections, leading to the stabilization of micellar end-caps by the embedded macromolecules. This process is more prominent in the case of the shorter polymer. Our finding that an increased MW of macromolecules permits the formation of longer hybrid micelles and enhances their rheological properties is of obvious importance for the fundamental understanding of polymer-surfactant interactions and the development of new industrial formulations based on hybrid polymer-wormlike surfactant micelles.
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12
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Kwiatkowski AL, Sharma H, Molchanov VS, Orekhov AS, Vasiliev AL, Dormidontova EE, Philippova OE. Wormlike Surfactant Micelles with Embedded Polymer Chains. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01500] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | - Hari Sharma
- Polymer
Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | | | - Anton S. Orekhov
- National
Research Centre “Kurchatov Institute”, 123182 Moscow, Russia
| | | | - Elena E. Dormidontova
- Polymer
Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
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13
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Affiliation(s)
- Udaya R. Dahal
- Polymer Program,
Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Zilu Wang
- 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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14
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Abstract
Gold nanoparticles (AuNPs) exhibit strong fluorescent and electromagnetic properties, which can be enhanced upon clustering and used in therapeutic, imaging, and sensing applications. A combination of gold nanoparticles with lipid nanodiscs can be attractive for AuNP self-assembly and useful in biomedical applications. Using molecular dynamics simulations we show that lipid nanodiscs can serve as templates for AuNP clustering into rings and string-like structures. We demonstrate that equilibrium encapsulation of 1 nm hydrophobically modified AuNPs into lipid nanodiscs composed of a mixture of dipalmitoylphosphatidylcholine (DPPC) and dihexanoylphosphatidylcholine (DHPC) lipids occurs at the rim and results in formation of a ring of gold. The interior of the nanodisc is inaccessible to AuNPs due to the DPPC liquid crystalline order. With temperature increase the lipid order diminishes, initiating the nanodisc transformation into a vesicle, upon which encapsulated AuNPs cluster into a close-packed string or nanoring, thereby stalling the vesiculation process at a "round vase" or cup-like stage depending on the AuNP concentration. In contrast, encapsulation of AuNPs by an equilibrium lipid vesicle results in its deformation with randomly clustered AuNPs, in agreement with experimental observations. We characterize the AuNP cluster size and surface-to-surface pair distribution, both of which impact the AuNP luminescent properties. We investigate the effect of alkane tether length on the nanodisc stability and AuNP clustering inside the nanodiscs and vesicles. Our results show that lipid nanodiscs can enhance gold cluster formation, which can be further exploited in imaging applications.
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Affiliation(s)
- Hari Sharma
- 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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15
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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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Dahal UR, Dormidontova EE. The dynamics of solvation dictates the conformation of polyethylene oxide in aqueous, isobutyric acid and binary solutions. Phys Chem Chem Phys 2017; 19:9823-9832. [DOI: 10.1039/c7cp00526a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamics of solvation dictates the conformation of polyethylene oxide in water and isobutyric acid causing a helix–coil transition in a mixed isobutyric acid/water solvent.
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Affiliation(s)
- Udaya R. Dahal
- Polymer Program
- Institute of Materials Science and Physics Department
- University of Connecticut
- Storrs
- USA
| | - Elena E. Dormidontova
- Polymer Program
- Institute of Materials Science and Physics Department
- University of Connecticut
- Storrs
- USA
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17
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Dahal UR, Dormidontova EE. Spontaneous Insertion, Helix Formation, and Hydration of Polyethylene Oxide in Carbon Nanotubes. Phys Rev Lett 2016; 117:027801. [PMID: 27447525 DOI: 10.1103/physrevlett.117.027801] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Indexed: 06/06/2023]
Abstract
Hydration strongly affects macromolecular conformation in solution and under nanoconfinement as encountered in nature and nanomaterials. Using atomistic molecular dynamics simulations we demonstrate that polyethylene oxide spontaneously enters single wall carbon nanotubes (CNTs) from aqueous solutions and forms rodlike, helix, and wrapped chain conformations depending on the CNT diameter. We show that water organization and the stability of the polyethylene oxide hydration shell under confinement is responsible for the helix formation, which can have significant implications for nanomaterial design.
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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
| | - Elena E Dormidontova
- Polymer Program, Institute of Materials Science and Physics Department, University of Connecticut, Storrs, Connecticut 06269, USA
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19
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Feldstein MM, Bovaldinova KA, Bermesheva EV, Moscalets AP, Dormidontova EE, Grinberg VY, Khokhlov AR. Thermo-Switchable Pressure-Sensitive Adhesives Based on Poly(N-vinyl caprolactam) Non-Covalently Cross-Linked by Poly(ethylene glycol). Macromolecules 2014. [DOI: 10.1021/ma501191k] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mikhail M. Feldstein
- Faculty
of Physics, M. V. Lomonosov Moscow State University, Leninskie
Gory, Moscow 119991, Russia
- D. I. Mendeleyev University of Chemical Technology of Russia, 9 Miusskaya Square, Moscow 125047, Russia
- A. N.
Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilova Street, 119991 Moscow, Russia
| | - Kermen A. Bovaldinova
- A. N.
Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilova Street, 119991 Moscow, Russia
| | - Eugenia V. Bermesheva
- A.
V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russia
| | - Alexander P. Moscalets
- A. N.
Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilova Street, 119991 Moscow, Russia
| | - Elena E. Dormidontova
- Institute
of Materials Science and Physics Department, University of Connecticut, 97 North Eagleville Road, Storrs, Connecticut 06269-3136, United States
| | - Valery Y. Grinberg
- A. N.
Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilova Street, 119991 Moscow, Russia
| | - Alexei R. Khokhlov
- Faculty
of Physics, M. V. Lomonosov Moscow State University, Leninskie
Gory, Moscow 119991, Russia
- A. N.
Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28 Vavilova Street, 119991 Moscow, Russia
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20
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Shibaev AV, Tamm MV, Molchanov VS, Rogachev AV, Kuklin AI, Dormidontova EE, Philippova OE. How a viscoelastic solution of wormlike micelles transforms into a microemulsion upon absorption of hydrocarbon: new insight. Langmuir 2014; 30:3705-3714. [PMID: 24617576 DOI: 10.1021/la500484e] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this article, we investigate the effect of hydrocarbon addition on the rheological properties and structure of wormlike micellar solutions of potassium oleate. We show that a viscoelastic solution of entangled micellar chains is extremely responsive to hydrocarbons-the addition of only 0.5 wt % n-dodecane results in a drastic drop in viscosity by up to 5 orders of magnitude, which is due to the complete disruption of micelles and the formation of microemulsion droplets. We study the whole range of the transition of wormlike micelles into microemulsion droplets and discover that it can be divided into three regions: (i) in the first region, the solutions retain a high viscosity (∼10-350 Pa·s), the micelles are entangled but their length is reduced by the solubilization of hydrocarbons; (ii) in the second region, the system transitions to the unentangled regime and the viscosity sharply decreases as a result of further micelle shortening and the appearance of microemulsion droplets; (iii) in the third region, the viscosity is low (∼0.001 Pa·s) and only microemulsion droplets remain in the solution. The experimental studies were accompanied by theoretical considerations, which allowed us to reveal for the first time that (i) one of the leading mechanisms of micelle shortening is the preferential accumulation of the solubilized hydrocarbon in the spherical end caps of wormlike micelles, which makes the end caps thermodynamically more favorable; (ii) the onset of the sharp drop in viscosity is correlated with the crossover from the entangled to unentangled regime of the wormlike micellar solution taking place upon the shortening of micellar chains; and (iii) in the unentangled regime short cylindrical micelles coexist with microemulsion droplets.
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Affiliation(s)
- Andrey V Shibaev
- Physics Department, Moscow State University , 119991 Moscow, Russia
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21
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Abstract
Selectivity of interactions between nanoparticles functionalized by tethered ligands and cell surfaces with different densities of receptors plays an essential role in biorecognition and its implementation in nanobiomedicine. We show that the onset of nanoparticle adsorption has a universal character for a range of nanoparticles: the onset receptor density decreases exponentially with the energy of ligand-receptor binding and inversely with the ligand density. We demonstrate that a bimodal tether distribution, which permits shielding ligands by longer nonfunctional tethers, leads to extra loss of entropy at the adsorption onset, enhancing the selectivity.
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Affiliation(s)
- Shihu Wang
- Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Cleveland, Ohio 44106-7202, USA
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22
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23
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Abstract
Using computer simulations, we systematically studied the influence of different design parameters of a spherical nanoparticle tethered with monovalent ligands on its efficiency of targeting planar cell surfaces containing mobile receptors. We investigate how the nanoparticle affinity can be affected by changing the binding energy, the percent of functionalization by ligands, tether length, grafting density, and nanoparticle core size. In general, using a longer tether length or increasing the number of tethered chains without increasing the number of ligands increases the conformational penalty for tether stretching/compression near the cell surface and leads to a decrease in targeting efficiency. At the same time, using longer tethers or a larger core size allows ligands to interact with receptors over a larger cell surface area, which can enhance the nanoparticle affinity toward the cell surface. We also discuss the selectivity of nanoparticle targeting of cells with a high receptor density. Based on the obtained results, we provide recommendations for improving the nanoparticle binding affinity and selectivity, which can guide future nanoparticle development for diagnostic and therapeutic purposes.
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Affiliation(s)
- Shihu Wang
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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24
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Abstract
Dissipative particle dynamics simulations are applied to study nanoparticle targeting to a cell surface containing a high concentration of receptors. We found that the normalized number of bound ligands follows an exponential growth function 1 - exp(-t/tau), with the lifetime tau increasing as a function of the binding strength. With increasing binding energy, the shape of the adsorbed nanoparticle becomes ellipsoidal due to a large number of stably bound ligands, most of which are positioned on the nanoparticle periphery. For a low degree of functionalization of homogeneously distributed ligands, the kinetics of nanoparticle attachment slows down due to interference by nonfunctional chains, the overall number of bound ligands at equilibrium decreases, although the stability of ligand attachment increases. Janus-like nanoparticles with functionalized chains positioned on one side of the nanoparticle exhibit more rapid binding to the cell surface with a large equilibrium number of stably bound ligands.
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Affiliation(s)
- Hadrian Djohari
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Affiliation(s)
- Zhenlong Li
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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Wang S, Dormidontova EE. Monte carlo simulations of metallo-supramolecular micelles. Macromol Rapid Commun 2010; 31:897-903. [PMID: 21590985 DOI: 10.1002/marc.200900900] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Revised: 01/15/2010] [Indexed: 11/08/2022]
Abstract
Using Monte Carlo simulations we show that the equilibrium properties of metallo-supramolecular micelles are determined by the competition of 2:1 and 1:1 metal-ligand complexation in the bulk and on the surface as well as steric interactions between the neighboring corona blocks attached to the surface. We predict that by increasing the association energy for the second metal-ligand bond, or decreasing the corona block length one can achieve a larger core surface coverage for metallo-supramolecular micelles. Compared to covalently bonded block copolymer micelles, we show that metallo-supramolecular micelles have smaller monomer and end group density, especially in the vicinity of the core, which may lead to experimentally observed aggregation.
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Affiliation(s)
- Shihu Wang
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
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27
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Abstract
Using computer simulations we study linear oligomers end functionalized with ligands that can form trans- or cis-2:1 complexes with metal ions in a salt-screened good solvent. We show that trans-cis isomerization of ligand-metal complexes can significantly increase the average molecular weight as well as trigger formation of reversible metallosupramolecular network based on 3:1 ligand-metal complexes acting as cross-linkers. We predict the conditions under which the most dramatic changes in the properties of metallosupramolecular polymers, such as network formation or increase in elastic plateau modulus of the network, occur upon isomerization.
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Affiliation(s)
- Shihu Wang
- Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Cleveland, Ohio 44106-7202, USA
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Hagy MC, Wang S, Dormidontova EE. Optimization of functionalized polymer layers for specific targeting of mobile receptors on cell surfaces. Langmuir 2008; 24:13037-47. [PMID: 18834163 PMCID: PMC2731659 DOI: 10.1021/la801935h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The reversible binding between a planar polymer layer functionalized by ligands and a planar cell surface containing different densities of mobile receptors has been studied by Monte Carlo simulations. Using the acceptance-ratio method, the distance-dependent profiles for the average number of ligands bound to receptors, the total free energy for the polymer layer-cell surface interaction and the interaction force were obtained. Four main design parameters for the polymer layer were considered: the degree of functionalization, chain degree of polymerization, polymer grafting density and the binding energy for the ligand-receptor interaction. We found that an increase in the degree of functionalization or in the absolute energy of ligand-receptor binding results in a larger number of ligands bound to the receptors, lower free energy, and stronger attractive force. Polymer layers composed of shorter chains were found to exhibit a deeper and narrower free energy profile and a larger attractive force, while longer tethers can interact with the cell surface at a larger and broader range of separation distances, in agreement with experimental observations. Our simulation results show that the increase in polymer grafting density from the mushroom to brush regime enhances the ligand availability and results in a stronger attractive force, increases the maximum binding distance, but exhibits a shallower free energy minimum due to the smaller tolerance to compression for polymer layers with high grafting density. We used two measures of the polymer layer binding affinity to the cell surface: the free energy minimum, related to the equilibrium binding constant and the fraction of bound ligands. We found that the polymer layers with a smaller chain length and grafting density, larger degree of functionalization, and larger absolute binding energy exhibit both a larger equilibrium binding constant to the cell surface and a larger average number of bound ligands, except for high binding energies when the maximum level of binding is reached independently of polymer length and grafting density. We showed that high binding specificity can be achieved by the polymer layers with intermediate ligand-receptor binding energies or an intermediate number of ligands, as a larger binding energy or number of ligands ensures a high binding affinity but lacks specificity while a smaller binding energy or number of ligands provides inadequate affinity. We found that the results for polymer layers with different properties follow a similar pattern when both high binding affinity to cells with high receptor density and high binding specificity are considered. As a result, the optimal design of the polymer layers can be achieved by using several different strategies, which are discussed.
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Affiliation(s)
- Matthew C. Hagy
- Department of Macromolecular Science and Engineering Case Western Reserve University, Cleveland, Ohio
| | - Shihu Wang
- Department of Macromolecular Science and Engineering Case Western Reserve University, Cleveland, Ohio
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering Case Western Reserve University, Cleveland, Ohio
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Sutton D, Wang S, Nasongkla N, Gao J, Dormidontova EE. Doxorubicin and beta-lapachone release and interaction with micellar core materials: experiment and modeling. Exp Biol Med (Maywood) 2007; 232:1090-9. [PMID: 17720955 DOI: 10.3181/0702-rm-31] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Polymer micelles with two different core-forming blocks, poly(d,l -lactide) (PLA) and poly(epsilon-caprolactone) (PCL), but the same coronal material, poly(ethylene glycol) (PEG), were investigated in this study as nanoscopic drug carriers. The release of two different drugs, doxorubicin (DOX) and beta-lapachone (beta-lap), from PEG(5k)-b-PCL(5k) and PEG(5k)-b-PLA(5k) micelles was studied at pH 5.0 and 7.4. Mathematical solutions of both Higuchi's model and Fickian diffusion equations were utilized to elucidate the differences between the micelle core materials for the two drugs. The neutral and smaller of the two drugs tested, beta-lap, demonstrated faster, pH-independent release, suggesting that no substantial changes occurred in either micelle core at lower pH. In contrast, the release rate of DOX was found to noticeably increase at lower pH with a larger cumulative amount of drug released. Different core materials were shown to have considerable influence on the release kinetics of both drugs: in both cases, the more hydrophobic PCL core showed slower drug release rates compared with the less hydrophobic PLA core.
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Affiliation(s)
- Damon Sutton
- Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
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Hagy MC, Chen CC, Dormidontova EE. Effect of Orientational Specificity of Complexation on the Behavior of Supramolecular Polymers: Theory and Simulation. Macromolecules 2007. [DOI: 10.1021/ma062146+] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- Chun-Chung Chen
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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Lund R, Willner L, Richter D, Dormidontova EE. Equilibrium Chain Exchange Kinetics of Diblock Copolymer Micelles: Tuning and Logarithmic Relaxation. Macromolecules 2006. [DOI: 10.1021/ma060328y] [Citation(s) in RCA: 142] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Reidar Lund
- Institute of Solid State Research, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Lutz Willner
- Institute of Solid State Research, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Dieter Richter
- Institute of Solid State Research, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202
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Chen CC, Dormidontova EE. Architectural and structural optimization of the protective polymer layer for enhanced targeting. Langmuir 2005; 21:5605-15. [PMID: 15924497 DOI: 10.1021/la047109v] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Using Monte Carlo simulations we study the influence of ligand architecture (valence, branching length) and structure (polydispersity) of a flat protective polymer layer on the accessibility of its functional groups and efficiency of receptor targeting. Two types of receptor surfaces were considered: the surface homogeneously covered with receptors and the surface containing a finite number of receptor sites. We found that multivalent ligands provide a larger density of targeting groups on the periphery of the layer compared to monovalent ligands for the same overall number of targeting groups per polymer layer. Because of their cooperativity in binding, multivalent ligands were also considerably more efficient in binding to both types of receptor surfaces. With an increase of ligand valence the number of functional groups attached to receptors noticeably increases. Short-branched divalent ligands show an especially high cooperativity in binding to closely packed receptors. However, in the case of immobile receptors separated by a finite distance from each other, the average distance between the functional groups belonging to the same short divalent ligand is too small to reach different receptors simultaneously and the receptor binding is less efficient than in the monovalent ligand case. Using a bidisperse protective polymer layer formed by short nonfunctional polymers and long functionalized polymers considerably increases the fraction of functional groups on the periphery of the layer. Simulations of receptor binding confirm the high efficiency of receptor targeting by bidisperse polymer layers, which is achieved by means of larger compressibility and higher capability of the ligands to reach out compared to the corresponding monodisperse layers. The concepts of multivalent ligands and a bidisperse protective polymer layer each have their own advantages which can be combined for an enhanced targeting effect.
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Affiliation(s)
- Chun-Chung Chen
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA
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Chen CC, Dormidontova EE. Supramolecular Polymer Formation by Metal−Ligand Complexation: Monte Carlo Simulations and Analytical Modeling. J Am Chem Soc 2004; 126:14972-8. [PMID: 15535726 DOI: 10.1021/ja047521x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Equilibrium metal-ligand complexation leading to formation of linear or ringlike supramolecular polymers is studied by means of Monte Carlo (MC) simulations and theoretical analysis. We found that in most of the cases high-molecular-weight polymers are formed over a rather narrow composition range (near the 2:1 ligand-metal ratio). Besides the imbalance in the number of metals and ligands, the molecular weight decrease in the metal-rich area is caused by an increase in 1:1 ligand-metal complex formation. The results of simulations and theoretical modeling show that the fraction of 1:1 complexes considerably decreases for metal-ligand pairs with a high cooperativity of complexation. On the basis of our analytical model, we suggest a simple criterion for choosing the metal/ligand pair to achieve high molecular weight complexes in a broad range of metal-rich compositions. Dilution of a solution of metallosupramolecular polymers is found to decrease the average molecular weight and to enhance ring formation, which otherwise is very limited.
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Affiliation(s)
- Chun-Chung Chen
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
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Affiliation(s)
- Chun-Chung Chen
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
| | - Elena E. Dormidontova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106
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Wang X, Dormidontova EE, Lodge TP. The Order−Disorder Transition and the Disordered Micelle Regime for Poly(ethylenepropylene-b-dimethylsiloxane) Spheres. Macromolecules 2002. [DOI: 10.1021/ma021009j] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaohui Wang
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Elena E. Dormidontova
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Timothy P. Lodge
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455-0431
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38
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Affiliation(s)
- Elena E. Dormidontova
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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39
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Affiliation(s)
- Elena E. Dormidontova
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minneapolis 55455-0431
| | - Timothy P. Lodge
- Department of Chemistry and Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minneapolis 55455-0431
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Grayer V, Dormidontova EE, Hadziioannou G, Tsitsilianis C. A Comparative Experimental and Theoretical Study between Heteroarm Star and Diblock Copolymers in the Microphase Separated State. Macromolecules 2000. [DOI: 10.1021/ma000311u] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Valérie Grayer
- Department of Polymer Chemistry and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Elena E. Dormidontova
- Department of Polymer Chemistry and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Georges Hadziioannou
- Department of Polymer Chemistry and Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Constantinos Tsitsilianis
- Department of Chemical Engineering, University of Patras and Institute of Chemical Engineering and High-Temperature Chemical Processes, ICE/HT-FORT, P.O. Box 1414, 26500 Patras, Greece
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Affiliation(s)
- Elena E. Dormidontova
- Department of Polymer Chemistry and Material Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Zeldovich KB, Dormidontova EE, Khokhlov AR, Vilgis TA. Microphase Separation Transition for Polyelectrolyte Gels in Poor Solvents. ACTA ACUST UNITED AC 1997. [DOI: 10.1051/jp2:1997147] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Dormidontova EE, Erukhimovich IY, Khokhlov AR. Microphase separation in poor-solvent polyelectrolyte solutions: Phase diagram. MACROMOL THEOR SIMUL 1994. [DOI: 10.1002/mats.1994.040030403] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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