1
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Sarıyer OS, Erbaş A. Polymer physics view of peripheral chromatin: de Gennes' self-similar carpet. Phys Rev E 2024; 109:054403. [PMID: 38907468 DOI: 10.1103/physreve.109.054403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 04/09/2024] [Indexed: 06/24/2024]
Abstract
Using scaling arguments to model peripheral chromatin localized near the inner surface of the nuclear envelope (NE) as a flexible polymer chain, we discuss the structural properties of the peripheral chromatin composed of alternating lamin-associated domains (LADs) and inter-LADs. Modeling the attraction of LADs to NE by de Gennes' self-similar carpet, which treats the chromatin layer as a polymer fractal, explains two major experimental observations. (i) The high density of chromatin close to the nuclear periphery decays to a constant density as the distance to the periphery increases. (ii) Due to the decreasing mesh size towards the nuclear periphery, the chromatin carpet inside NE excludes molecules (via nonspecific interactions) above a threshold size that depends on the distance from the nuclear periphery.
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Affiliation(s)
- Ozan S Sarıyer
- Pîrî Reis University, School of Arts and Sciences, Tuzla 34940, Istanbul, Turkey
| | - Aykut Erbaş
- UNAM National Nanotechnology Research Center and Institute of Materials Science & Nanotechnology, Bilkent University, Ankara 06800, Turkey and University of Silesia, Institute of Physics, 41-500 Katowice, Poland
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2
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Wang J, Waltmann C, Harms C, Hu S, Hegarty J, Shindel B, Wang Q, Dravid V, Shull KR, Torkelson JM, Olvera de la Cruz M. Tailoring Interactions of Random Copolymer Polyelectrolyte Complexes to Remove Nanoplastic Contaminants from Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:7514-7523. [PMID: 37196238 DOI: 10.1021/acs.langmuir.3c01028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We investigate the usage of polyelectrolyte complex materials for water remediation purposes, specifically their ability to remove nanoplastics from water, on which there is currently little to no prior research. We demonstrate that oppositely charged random copolymers are effective at quantitatively removing nanoplastic contamination from aqueous solution. The mechanisms underlying this remediation ability are explored through computational simulations, with corroborating quartz crystal microbalance adsorption experiments. We find that hydrophobic nanostructures and interactions likely play an important role.
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Affiliation(s)
- Jeremy Wang
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Curt Waltmann
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Caroline Harms
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Sumeng Hu
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - John Hegarty
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Benjamin Shindel
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Qifeng Wang
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Vinayak Dravid
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Kenneth R Shull
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - John M Torkelson
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Monica Olvera de la Cruz
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
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3
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Huang C, Podgornik R, Man X. Selective Adsorption of Confined Polymers: Self-Consistent Field Theory Studies. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Changhang Huang
- Center of Soft Matter Physics and its Applications, Beihang University, Beijing 100191, China
- School of Physics, Beihang University, Beijing 100191, China
| | - Rudolf Podgornik
- School of Physical Sciences and Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences (CAS), Beijing 100190, China
- Wenzhou Institute of the University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325000, China
- Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Xingkun Man
- Center of Soft Matter Physics and its Applications, Beihang University, Beijing 100191, China
- School of Physics, Beihang University, Beijing 100191, China
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4
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He Q, Zhang Y, Chen Q. Crosslinking ABA-type elastomers with polyoxometalate: A convenient molecular design of double network. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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5
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Yu AC, Lian H, Kong X, Lopez Hernandez H, Qin J, Appel EA. Physical networks from entropy-driven non-covalent interactions. Nat Commun 2021; 12:746. [PMID: 33531475 PMCID: PMC7854746 DOI: 10.1038/s41467-021-21024-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Accepted: 01/08/2021] [Indexed: 12/22/2022] Open
Abstract
Physical networks typically employ enthalpy-dominated crosslinking interactions that become more dynamic at elevated temperatures, leading to network softening. Moreover, standard mathematical frameworks such as time-temperature superposition assume network softening and faster dynamics at elevated temperatures. Yet, deriving a mathematical framework connecting the crosslinking thermodynamics to the temperature-dependent viscoelasticity of physical networks suggests the possibility for entropy-driven crosslinking interactions to provide alternative temperature dependencies. This framework illustrates that temperature negligibly affects crosslink density in reported systems, but drastically influences crosslink dynamics. While the dissociation rate of enthalpy-driven crosslinks is accelerated at elevated temperatures, the dissociation rate of entropy-driven crosslinks is negligibly affected or even slowed under these conditions. Here we report an entropy-driven physical network based on polymer-nanoparticle interactions that exhibits mechanical properties that are invariant with temperature. These studies provide a foundation for designing and characterizing entropy-driven physical crosslinking motifs and demonstrate how these physical networks access thermal properties that are not observed in current physical networks.
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Affiliation(s)
- Anthony C Yu
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA
| | - Huada Lian
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Xian Kong
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | | | - Jian Qin
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
| | - Eric A Appel
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA.
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6
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He Q, Zhang Y, Li H, Chen Q. Rheological Properties of ABA-Type Copolymers Physically End-Cross-Linked by Polyoxometalate. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01817] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qingbin He
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, P. R. China
- University of Science and Technology of China, 230026 Hefei, P. R. China
| | - Yanjie Zhang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, P. R. China
- University of Science and Technology of China, 230026 Hefei, P. R. China
| | - Haolong Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China
| | - Quan Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, P. R. China
- University of Science and Technology of China, 230026 Hefei, P. R. China
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7
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Abstract
A scaling model for the structure of coacervates is presented for mixtures of oppositely-charged polyelectrolytes of both symmetric and asymmetric charge-densities for different degrees of electrostatic strength and levels of added salt. At low electrostatic strengths, weak coacervates, with the energy of electrostatic interactions between charges less than the thermal energy, k B T, are liquid. At higher electrostatic strengths, strong coacervates are gels with crosslinks formed by ion pairs of opposite charges bound to each other with energy higher than k B T. Charge-symmetric coacervates are formed for mixtures of oppositely-charged polyelectrolytes with equal and opposite charge-densities. While charge-symmetric weak coacervates form a semidilute polymer solution with a correlation length equal to the electrostatic blob size, charge-symmetric strong coacervates form reversible gels with a correlation length on the order of the distance between bound ion pairs. Charge-asymmetric coacervates are formed from mixtures of oppositely-charged polyelectrolytes with different charge-densities. While charge-asymmetric weak coacervates form double solutions with two correlation lengths and qualitatively different chain conformations of polycations and polyanions, charge-asymmetric strong coacervates form bottlebrush and star-like gels. Unlike liquid coacervates, for which an increase in the concentration of added salt screens electrostatic interactions, causing structural rearrangement and eventually leads to their dissolution, the salt does not affect the structure of strong coacervates until ion pairs dissociate and the gel disperses.
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Affiliation(s)
- Scott P O Danielsen
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, United States
| | - Sergey Panyukov
- P. N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow 117924, Russia
| | - Michael Rubinstein
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, United States
- Departments of Biomedical Engineering, Physics, and Chemistry, Duke University, Durham, NC 27708, United States
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Navarro LA, Shah TP, Zauscher S. Grafting To of Bottlebrush Polymers: Conformation and Kinetics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:4745-4756. [PMID: 32105081 DOI: 10.1021/acs.langmuir.9b03620] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Specifically adsorbed bottlebrush coatings are found in nature as brush-like glycoproteins that decorate biointerfaces and provide antifouling, lubrication, or wear-protection. Although various synthetic strategies have been developed to mimic glycoprotein structure and function, the use of these mimics is still limited because of the current lack of understanding of their adsorption behavior and surface conformation. In this paper, we examine the adsorption behavior of PEG-based, biotinylated bottlebrushes with different backbone and bristle lengths to streptavidin model surfaces in phosphate-buffered saline. By using quartz crystal microbalance, localized surface plasmon resonance, and atomic force microscopy, we learn how bottlebrush dimensions impact their adsorption kinetics, surface conformation, mechanical properties, and antifouling properties. Our bottlebrushes qualitatively mirror the adsorption behavior of linear polymers and exhibit three kinetic regimes of adsorption: (I) a transport-limited regime, (II) a pause, and (III) a penetration-limited regime. Furthermore, we find that the bristle length more dramatically affects brush properties than the backbone length. Generally, larger bottlebrush dimensions lead to reduced molar adsorption, retarded kinetics, weaker antifouling, and softer brush coatings. Longer bristles also lead to less mass adsorption, while the opposite trend is observed for increasing backbone length. In summary, our findings aid the rational design of new bottlebrush coatings by elucidating how their dimensions impact adsorption, surface conformation, and the properties of the final coating.
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Affiliation(s)
- Luis A Navarro
- Department of Mechanical Engineering and Materials Science, Duke University, 101 Science Drive, Durham, North Carolina 27708, United States
| | - Tejank P Shah
- Department of Mechanical Engineering and Materials Science, Duke University, 101 Science Drive, Durham, North Carolina 27708, United States
| | - Stefan Zauscher
- Department of Mechanical Engineering and Materials Science, Duke University, 101 Science Drive, Durham, North Carolina 27708, United States
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9
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Briffod C, Bédard C, Vanore M. Stability of epidermal growth factor, fibronectin, and alpha-2-macroglobulin in canine serum under different storage conditions. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2019; 83:267-271. [PMID: 31571726 PMCID: PMC6753891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 11/12/2018] [Indexed: 06/10/2023]
Abstract
The objective of this study was to assess whether concentrations of epidermal growth factor (EGF), fibronectin, and alpha(α)-2-macroglobulin in canine serum remain stable under different storage conditions. Serum was obtained from 10 adult dogs and stored for 7 d at room temperature (RT) and at 4°C and for 1, 3, and 6 mo at -20°C. Bacterial cultures of serum were carried out after 7 d at 4°C and at RT. For each dog and time point, EGF, fibronectin, and α-2-macroglobulin were quantified in duplicate by enzyme-linked immunosorbent assay (ELISA). Mean concentrations of each factor at each time point were used for statistical analysis. No bacterial growth was observed in any samples. Compared to baseline (232.24 ± 49.47 pg/mL), EGF concentration was significantly lower after 1 wk of storage at 4°C (135.39 ± 27.12 pg/mL, P = 0.006), but not at RT (315.85 ± 79 pg/mL, P = 0.6) or after 1, 3, or 6 mo of storage at -20°C (220.84 ± 41.07 pg/mL, P = 0.7; 220.98 ± 78.26 pg/mL, P = 0.8; 266.06 ± 20.39 pg/mL, P = 0.4, respectively). Compared to baseline, concentrations of fibronectin after 1 wk of storage at 4°C or at RT and 1, 3, or 6 mo of storage at -20°C were not statistically different. Compared to baseline (186.67 ± 45.20 mg/dL), the concentration of α-2-macroglobulin after 1 wk of storage at 4°C was significantly increased (244.61 ± 58.27 mg/dL, P = 0.002), but not at RT (177.09 ± 26.99 mg/dL, P = 0.2). The differences in concentration after 3 and 6 mo of storage at -20°C were significant compared to baseline (243.32 ± 42.64 mg/dL, P = 0.005 and 56.39 ± 21.78 mg/dL, P < 0.0001, respectively), but not after 1 mo of storage at -20°C (136.79 ± 25.61 mg/dL, P = 0.1). One week of storage at RT has little effect on the stability of EGF, fibronectin, and α-2-macroglobulin in canine serum. Measured factors remain stable for 3 mo of storage at -20°C.
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Affiliation(s)
- Cecile Briffod
- Department of Clinical Sciences (Briffod, Vanore) and Department of Microbiology and Pathology (Bédard), Faculty of Veterinary Medicine, University of Montreal, 3200 rue Sicotte, St-Hyacinthe, Quebec J2S 2M2
| | - Christian Bédard
- Department of Clinical Sciences (Briffod, Vanore) and Department of Microbiology and Pathology (Bédard), Faculty of Veterinary Medicine, University of Montreal, 3200 rue Sicotte, St-Hyacinthe, Quebec J2S 2M2
| | - Maria Vanore
- Department of Clinical Sciences (Briffod, Vanore) and Department of Microbiology and Pathology (Bédard), Faculty of Veterinary Medicine, University of Montreal, 3200 rue Sicotte, St-Hyacinthe, Quebec J2S 2M2
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10
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Effect of polycation charge density on polymer conformation at the clay surface and consequently on pharmaceutical binding. J Colloid Interface Sci 2019; 552:517-527. [DOI: 10.1016/j.jcis.2019.05.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 05/22/2019] [Accepted: 05/24/2019] [Indexed: 11/23/2022]
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11
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Ge T, Rubinstein M. Mobility of Polymer-Tethered Nanoparticles in Unentangled Polymer Melts. Macromolecules 2019; 52:1536-1545. [PMID: 30956355 PMCID: PMC6449055 DOI: 10.1021/acs.macromol.8b02138] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A scaling theory is developed for the motion of a polymer-tethered nanoparticle (NP) in an unentangled polymer melt. We identify two types of scaling regimes depending on the NP diameter d and the size of a grafted polymer chain (tail) R tail . In one type of regimes, the tethered NP motion is dominated by the bare NP, as the friction coefficient of the tails is lower than that of the less mobile particle. The time dependence of the mean square displacement (MSD) of the tethered NP ⟨Δr 2(t)⟩ in the particle-dominated regime can be approximated by ⟨Δr 2(t)⟩ bare for the bare NP. In the other type of regimes, the tethered NP motion is dominated by the tails when the friction coefficient of the tails surpasses that of the particle at times longer than the crossover time τ ∗. In a tail-dominated regime, the MSD ⟨Δr 2(t)⟩ ≈ ⟨Δr 2(t)⟩ bare only for t < τ ∗. ⟨Δr 2(t)⟩ of a single-tail NP for t > τ ∗ is approximated as the MSD ⟨Δr 2(t)⟩ tail of monomers in a free tail, whereas ⟨Δr 2(t)⟩ of a multi-tail NP for t > τ ∗ is approximated as the MSD ⟨Δr 2(t)⟩ star of the branch point of a star polymer. The time dependence of ⟨Δr 2(t)⟩ in a tail-dominated regime exhibits two qualitatively different sub-diffusive regimes. The first sub-diffusive regime for t < τ ∗ arises from the dynamical coupling between the particle and the melt chains. The second sub-diffusive regime for t > τ ∗ occurs as the particle participates in the dynamics of the tails. For NPs with loosely grafted chains, there is a Gaussian brush region surrounding the NP, where the chain strands in Gaussian conformations undergo Rouse dynamics with no hydrodynamic coupling. The crossover time τ ∗ for loosely grafted multi-tail NPs in a tail-dominated regime decreases as the number of tails increases. For NPs with densely grafted chains, the tails are hydrodynamically coupled to each other. The hydrodynamic radii for the diffusion of densely grafted multi-tail NPs are approximated by the sum of the particle and tail sizes.
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Affiliation(s)
- Ting Ge
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
| | - Michael Rubinstein
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
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12
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Abstract
Membraneless organelles are aggregates of disordered proteins that form spontaneously to promote specific cellular functions in vivo. The possibility of synthesizing membraneless organelles out of cells will therefore enable fabrication of protein-based materials with functions inherent to biological matter. Since random copolymers contain various compositions and sequences of solvophobic and solvophilic groups, they are expected to function in nonbiological media similarly to a set of disordered proteins in membraneless organelles. Interestingly, the internal environment of these organelles has been noted to behave more like an organic solvent than like water. Therefore, an adsorbed layer of random copolymers that mimics the function of disordered proteins could, in principle, protect and enhance the proteins' enzymatic activity even in organic solvents, which are ideal when the products and/or the reactants have limited solubility in aqueous media. Here, we demonstrate via multiscale simulations that random copolymers efficiently incorporate proteins into different solvents with the potential to optimize their enzymatic activity. We investigate the key factors that govern the ability of random copolymers to encapsulate proteins, including the adsorption energy, copolymer average composition, and solvent selectivity. The adsorbed polymer chains have remarkably similar sequences, indicating that the proteins are able to select certain sequences that best reduce their exposure to the solvent. We also find that the protein surface coverage decreases when the fluctuation in the average distance between the protein adsorption sites increases. The results herein set the stage for computational design of random copolymers for stabilizing and delivering proteins across multiple media.
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Panganiban B, Qiao B, Jiang T, DelRe C, Obadia MM, Nguyen TD, Smith AAA, Hall A, Sit I, Crosby MG, Dennis PB, Drockenmuller E, Olvera de la Cruz M, Xu T. Random heteropolymers preserve protein function in foreign environments. Science 2018; 359:1239-1243. [DOI: 10.1126/science.aao0335] [Citation(s) in RCA: 142] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 01/25/2018] [Indexed: 12/25/2022]
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14
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Gu C, Coalson RD, Jasnow D, Zilman A. Free Energy of Nanoparticle Binding to Multivalent Polymeric Substrates. J Phys Chem B 2017. [DOI: 10.1021/acs.jpcb.7b00868] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chad Gu
- Department
of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
| | - Rob D. Coalson
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - David Jasnow
- Department
of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Anton Zilman
- Department
of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
- Institute
of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G9, Canada
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15
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Jamal A, Nyrkova I, Mesini P, Militzer S, Reiter G. Solvent-controlled reversible switching between adsorbed self-assembled nanoribbons and nanotubes. NANOSCALE 2017; 9:3293-3303. [PMID: 28225113 DOI: 10.1039/c6nr08211d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have demonstrated that solutions of 3,5-bis-(5-hexylcarbamoylpentyloxy)-benzoic acid decyl ester (BHPB-10) can form metastable nanostructures on solid substrates and in the bulk. BHPB-10 is an achiral molecule involving several distinct, strongly interacting groups (SIGs), one aromatic-ester ring and two amide groups per molecule. Specific solvents affect the interactions between particular SIGs, thus promoting various nano-structures: lamellae, nanoribbons, helical ribbons, or nanotubes. In cyclohexane, a solvent allowing for both inter-amide hydrogen bonds and mutual attraction of rings, the formation of nanotubes with a diameter of 28 ± 5 nm was observed in the bulk and on surfaces. By contrast, in cyclohexanone, which suppresses inter-amide hydrogen bonds, flat nanoribbons with a specific width of 12 ± 4 nm were formed on solid substrates after drying. By annealing in cyclohexane vapor, we followed the process of switching surface structures from nanoribbons to nanotubes and observed helical ribbons as the precursor of nanotubes. We also turned nanotubes back into nanoribbons by adding cyclohexanone, thus demonstrating reversible switching along the route: tubes → lamellae → flat ribbons → helical ribbons → tubes. We propose models explaining the observed nanostructures and their transformations, including the origin of spontaneous chirality of the helical ribbons. Our findings on the self-assembly in the achiral BHPB-10 solutions provide insight into the influence of complementary inter-molecular specific SIG-based interactions and demonstrate an effective route for tailoring the shape and size of nanostructures derived from the same building unit.
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Affiliation(s)
- Asad Jamal
- Institute of Physics, University of Freiburg, Herman-Herder-Strasse 3, 79104 Freiburg, Germany. and Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
| | - Irina Nyrkova
- Institut Charles Sadron, 23 rue du Loess BP 84047, F-67034 Strasbourg Cedex 2, France
| | - Philippe Mesini
- Institut Charles Sadron, 23 rue du Loess BP 84047, F-67034 Strasbourg Cedex 2, France
| | - Swann Militzer
- Institut Charles Sadron, 23 rue du Loess BP 84047, F-67034 Strasbourg Cedex 2, France
| | - Günter Reiter
- Institute of Physics, University of Freiburg, Herman-Herder-Strasse 3, 79104 Freiburg, Germany. and Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
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16
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Carrillo JMY, Cheng S, Kumar R, Goswami M, Sokolov AP, Sumpter BG. Untangling the Effects of Chain Rigidity on the Structure and Dynamics of Strongly Adsorbed Polymer Melts. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00624] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
| | | | | | | | - Alexei P. Sokolov
- Department
of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
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