1
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Landfield H, Kalamaris N, Wang M. Extreme dependence of dynamics on concentration in highly crowded polyelectrolyte solutions. SCIENCE ADVANCES 2024; 10:eado4976. [PMID: 38959308 PMCID: PMC11221520 DOI: 10.1126/sciadv.ado4976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 05/30/2024] [Indexed: 07/05/2024]
Abstract
Charge-carrying species, such as polyelectrolytes, are vital to natural and synthetic processes that rely on their dynamic behavior. Through single-particle tracking techniques, the diffusivity of individual polyelectrolyte chains and overall system viscosity are determined for concentrated polylysine solutions. These studies show scaling dependences of D ~ c-6.1 and η ~ c7.2, much stronger than theoretical predictions, drawing the applicability of power law fits into question. Similar trends are observed in concentrated solutions prepared at various pH and counterion conditions. These hindered system dynamics appear universal to polyelectrolyte systems and are attributed to the large effective excluded volumes of polyelectrolyte chains inducing glassy dynamics. The framework of the Vrentas-Duda free-volume theory is used to compare polyelectrolyte and neutral systems. Supported by this theory, excluding counterion mass from total polymer mass results in all environmental conditions collapsing onto a common trendline. These results are applicable to crowded biological systems, such as intracellular environments where protein mobility is strongly inhibited.
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Affiliation(s)
- Harrison Landfield
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA
| | - Nicholas Kalamaris
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA
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2
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Walhout PK, He Z, Dutagaci B, Nawrocki G, Feig M. Molecular Dynamics Simulations of Rhodamine B Zwitterion Diffusion in Polyelectrolyte Solutions. J Phys Chem B 2022; 126:10256-10272. [PMID: 36440862 PMCID: PMC9813770 DOI: 10.1021/acs.jpcb.2c06281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polyelectrolytes continue to find wide interest and application in science and engineering, including areas such as water purification, drug delivery, and multilayer thin films. We have been interested in the dynamics of small molecules in a variety of polyelectrolyte (PE) environments; in this paper, we report simulations and analysis of the small dye molecule rhodamine B (RB) in several very simple polyelectrolyte solutions. Translational diffusion of the RB zwitterion has been measured in fully atomistic, 2 μs long molecular dynamics simulations in four different polyelectrolyte solutions. Two solutions contain the common polyanion sodium poly(styrene sulfonate) (PSS), one with a 30-mer chain and the other with 10 trimers. The other two solutions contain the common polycation poly(allyldimethylammonium) chloride (PDDA), one with two 15-mers and the other with 10 trimers. RB diffusion was also simulated in several polymer-free solutions to verify its known experimental value for the translational diffusion coefficient, DRB, of 4.7 × 10-6 cm2/s at 300 K. RB diffusion was slowed in all four simulated PE solutions, but to varying degrees. DRB values of 3.07 × 10-6 and 3.22 × 10-6 cm2/s were found in PSS 30-mer and PSS trimer solutions, respectively, whereas PDDA 15-mer and trimer solutions yielded values of 2.19 × 10-6 and 3.34 × 10-6 cm2/s. Significant associations between RB and the PEs were analyzed and interpreted via a two-state diffusion model (bound and free diffusion) that describes the data well. Crowder size effects and anomalous diffusion were also analyzed. Finally, RB translation along the polyelectrolytes during association was characterized.
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Affiliation(s)
| | - Zhe He
- Wheaton College, Chemistry Department, 501 College Ave, Wheaton, IL 60187
| | - Bercem Dutagaci
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
| | - Grzegorz Nawrocki
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
| | - Michael Feig
- Michigan State University, Biochemistry and Molecular Biology, 603 Wilson Road, Room 218, East Lansing, MI 48824
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3
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Chen Y, Yan R, Zhao N. Passive and active tracer dynamics in polymer solutions with isotropic-to-nematic phase transition. Phys Chem Chem Phys 2022; 24:7415-7429. [PMID: 35266498 DOI: 10.1039/d2cp00323f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Macromolecular crowding plays a crucial role in determining the dynamics in a living cell. We adopt Langevin dynamics simulations to investigate the anomalous diffusion dynamics of passive and active particles in a solution of polymer chains with tunable stiffness. The solution's anisotropic feature is modulated by changing both the polymer stiffness and volume fraction, where isotropic-to-nematic phase transition is involved. Our results demonstrate the significant impact of polymer flexibility on the dynamics of both passive and active probes. The distinct diffusion mechanism for an active particle is clarified by the interplay between polymer stiffness, crowdedness and activity. Polymer stiffness leads to a global inhibition effect on passive particle diffusion. The diffusion coefficient exhibits an intriguing non-monotonic variation at increasing polymer stiffness, which is due to the fact that the alignment of polymer chains is beneficial for diffusion along the nematic direction but unfavorable for that in the direction perpendicular to it. In sharp contrast, polymer stiffness plays a dominant role in facilitating active particle diffusion. Self-propulsion of the particle can utilize stiffness-induced elastic interactions more efficiently, which promotes its mobility in both directions. Meanwhile, an active particle might have a stronger ability to take advantage of the polymer alignment, contributing substantially enhanced diffusivity. In addition, the diffusion coefficient of an active particle is subject to a tendency of degeneration against varying volume fraction. This counter-intuitive behavior is due to the contrasting factors that increasing crowdedness induces a lower particle speed but a longer persistent motion time.
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Affiliation(s)
- Ying Chen
- College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Ran Yan
- College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Nanrong Zhao
- College of Chemistry, Sichuan University, Chengdu 610064, China.
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4
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Optimization of zero-shear viscosity for HPAM-Polystyrene microspheres formulations through experimental design approach. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02473-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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5
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Slim AH, Poling-Skutvik R, Conrad JC. Local Confinement Controls Diffusive Nanoparticle Dynamics in Semidilute Polyelectrolyte Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9153-9159. [PMID: 32678607 DOI: 10.1021/acs.langmuir.0c01402] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the mobility of polystyrene particles ranging from 100 to 790 nm in diameter in dilute and semidilute sodium polystyrene sulfonate (NaPSS) solutions using fluorescence microscopy. We tune the polymer conformations by varying the ionic strength of the solution. The nanoparticle mean-squared displacements evolve linearly with time at all time scales, indicating Fickian diffusive dynamics. In solutions of high ionic strength, chains adopt a random walk conformation and particle dynamics couple to the bulk zero-shear rate viscosity, according to the Stokes-Einstein picture. In solutions of low ionic strength, however, particle dynamics nonmonotonically deviate from bulk predictions as polymer concentration increases and are not accurately predicted by the available models. These nonmonotonic dynamics directly correlate with the non-Gaussianity in distributions of particle displacements, suggesting the emergence of a local confining length scale as polyelectrolyte concentration increases.
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Affiliation(s)
- Ali H Slim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Ryan Poling-Skutvik
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Jacinta C Conrad
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
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6
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Li H, Zheng K, Yang J, Zhao J. Anomalous Diffusion Inside Soft Colloidal Suspensions Investigated by Variable Length Scale Fluorescence Correlation Spectroscopy. ACS OMEGA 2020; 5:11123-11130. [PMID: 32455234 PMCID: PMC7241028 DOI: 10.1021/acsomega.0c01052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 04/24/2020] [Indexed: 06/11/2023]
Abstract
The diffusion of molecules and particles inside the aqueous suspension of soft colloids (polymer microgels) is investigated using variable length scale fluorescence correlation spectroscopy (VLS-FCS). Carbopol 940 is chosen as the model matrix system, and two factors affecting diffusion are investigated: the spatial hindrance and the diffusant-matrix interaction. By studying diffusion of molecules and particles with different sizes inside the suspension, VLS-FCS reveals the restricted motion at a short length scale, that is, in the gaps between the microgels, and normal diffusion at a larger length scale. The information on the gap's length scale is also accessed. On the other hand, by tuning the pH value, the diffusant-matrix electrostatic attraction is adjusted and the results expose a short-time fast diffusion of probe molecules inside the gaps and a long-time restricted diffusion because of trapping inside the microgels. It is proved that VLS-FCS is a powerful method, investigating anomalous diffusion at different length scales and it is a promising approach to investigate diffusion in complex soft matter systems.
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Affiliation(s)
- Hengyi Li
- Beijing
National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- The
University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kaikai Zheng
- Beijing
National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- The
University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingfa Yang
- Beijing
National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- The
University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiang Zhao
- Beijing
National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- The
University of Chinese Academy of Sciences, Beijing 100049, China
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7
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Xue C, Shi X, Tian Y, Zheng X, Hu G. Diffusion of Nanoparticles with Activated Hopping in Crowded Polymer Solutions. NANO LETTERS 2020; 20:3895-3904. [PMID: 32208707 DOI: 10.1021/acs.nanolett.0c01058] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A long-distance hop of diffusive nanoparticles (NPs) in crowded environments was commonly considered unlikely, and its characteristics remain unclear. In this work, we experimentally identify the occurrence of the intermittent hops of large NPs in crowded entangled poly(ethylene oxide) (PEO) solutions, which are attributed to thermally induced activated hopping. We show that the diffusion of NPs in crowded solutions is considered as a superposition of the activated hopping and the reptation of the polymer solution. Such activated hopping becomes significant when either the PEO molecular weight is large enough or the NP size is relatively small. We reveal that the time-dependent non-Gaussianity of the NP diffusion is determined by the competition of the short-time relaxation of a polymer entanglement strand, the activated hopping, and the long-time reptation. We propose an exponential scaling law τhop/τe ∼ exp(d/dt) to characterize the hopping time scale, suggesting a linear dependence of the activated hopping energy barrier on the dimensionless NP size. The activated hopping motion can only be observed between the onset time scale of the short-time relaxation of local entanglement strands and the termination time scale of the long-time relaxation. Our findings on activated hopping provide new insights into long-distance transportation of NPs in crowded biological environments, which is essential to the delivery and targeting of nanomedicines.
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Affiliation(s)
- Chundong Xue
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
- School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian, Liaoning 116024, China
- University of Chinese Academy of Science, Beijing 100149, China
| | - Xinghua Shi
- National Center for Nanoscience and Technology of China, Beijing 100190, China
- University of Chinese Academy of Science, Beijing 100149, China
| | - Yu Tian
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Xu Zheng
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
| | - Guoqing Hu
- Department of Engineering Mechanics & State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, Zhejiang 310027, China
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8
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Chen A, Zhang B, Zhao N. A comparative study of semi-flexible linear and ring polymer conformational change in an anisotropic environment. Phys Chem Chem Phys 2020; 22:9137-9147. [PMID: 32301953 DOI: 10.1039/c9cp07018d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We adopt a Langevin-dynamics based simulation to systematically study the conformational change of a semi-flexible probed polymer in a rod crowding environment. Two topologically different probed polymer types, linear and ring polymers, are specifically considered. Our results unravel the significance of the interplay of probed polymer's semi-flexibility and crowding anisotropy. Firstly, both ring and linear polymers show a non-trivial dimensional change including nonmonotonicity and collapse-swelling crossover as their stiffness increases. Secondly, we modulate rod crowder length to investigate the anisotropic effect. We reveal that the formation of an ordered parallel arrangement of the environment can effectively lead to a remarkable stretching effect on the probed polymer. The coupling between the crowding anisotropy-induced stretching and the polymer stiffness can account for the unusual swelling behavior. Lastly, nonmonotonic swelling and shape change of the ring polymer are analyzed. We find out that the ring polymer is subject to most pronounced swelling at robust stiffness. Moreover, the maximum prolate shape is also observed at the same robust location.
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Affiliation(s)
- Anpu Chen
- College of Chemistry, Sichuan University, Chengdu 610064, China.
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9
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Sorichetti V, Hugouvieux V, Kob W. Determining the Mesh Size of Polymer Solutions via the Pore Size Distribution. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02166] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Valerio Sorichetti
- Laboratoire Charles Coulomb (L2C), Université Montpellier, CNRS, F-34095, Montpellier, France
- IATE, INRAE, CIRAD, Montpellier SupAgro, Université Montpellier, F-34060, Montpellier, France
| | - Virginie Hugouvieux
- IATE, INRAE, CIRAD, Montpellier SupAgro, Université Montpellier, F-34060, Montpellier, France
| | - Walter Kob
- Laboratoire Charles Coulomb (L2C), Université Montpellier, CNRS, F-34095, Montpellier, France
- Institut Universitaire de France
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10
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Chen K, Zheng K, Xu G, Yang J, Zhao J. Diffusive Motion of Single Polyelectrolyte Molecules under Electrostatic Repulsion. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kuo Chen
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kaikai Zheng
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guofeng Xu
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jingfa Yang
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jiang Zhao
- Beijing National Research Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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11
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Chen R, Poling-Skutvik R, Howard MP, Nikoubashman A, Egorov SA, Conrad JC, Palmer JC. Influence of polymer flexibility on nanoparticle dynamics in semidilute solutions. SOFT MATTER 2019; 15:1260-1268. [PMID: 30444237 DOI: 10.1039/c8sm01834k] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The hierarchical structure and dynamics of polymer solutions control the transport of nanoparticles (NPs) through them. Here, we perform multi-particle collision dynamics simulations of solutions of semiflexible polymer chains with tunable persistence length lp to investigate the effect of chain stiffness on NP transport. The NPs exhibit two distinct dynamical regimes - subdiffusion on short time scales and diffusion on long time scales. The long-time NP diffusivities are compared with predictions from the Stokes-Einstein relation (SER), mode-coupling theory (MCT), and a recent polymer coupling theory (PCT). Increasing deviations from the SER as the polymer chains become more rigid (i.e. as lp increases) indicate that the NP motions become decoupled from the bulk viscosity of the polymer solution. Likewise, polymer stiffness leads to deviations from PCT, which was developed for fully flexible chains. Independent of lp, however, the long-time diffusion behavior is well-described by MCT, particularly at high polymer concentration. We also observed that the short-time subdiffusive dynamics are strongly dependent on polymer flexibility. As lp is increased, the NP dynamics become more subdiffusive and decouple from the dynamics of the polymer chain center-of-mass. We posit that these effects are due to differences in the segmental mobility of the semiflexible chains.
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Affiliation(s)
- Renjie Chen
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
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12
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Yuan C, Chen A, Zhang B, Zhao N. Activity–crowding coupling effect on the diffusion dynamics of a self-propelled particle in polymer solutions. Phys Chem Chem Phys 2019; 21:24112-24125. [DOI: 10.1039/c9cp04498a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The anomalous diffusion dynamics of an active particle in polymer solutions is studied based on a Langevin Brownian dynamics simulation.
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Affiliation(s)
- Chengli Yuan
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Anpu Chen
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Bingjie Zhang
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Nanrong Zhao
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
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13
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Chen A, Zhao N. Comparative study of the crowding-induced collapse effect in hard-sphere, flexible polymer and rod-like polymer systems. Phys Chem Chem Phys 2019; 21:12335-12345. [DOI: 10.1039/c9cp01731c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A systematic Langevin simulation is performed to study the crowding-induced collapse effect on a probed chain in three typical systems: hard sphere (HS), flexible polymer and rod-like polymer.
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Affiliation(s)
- Anpu Chen
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Nanrong Zhao
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
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14
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Volgin IV, Larin SV, Lyulin SV. Diffusion of Nanoparticles in Polymer Systems. POLYMER SCIENCE SERIES C 2018. [DOI: 10.1134/s1811238218020212] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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15
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Sorichetti V, Hugouvieux V, Kob W. Structure and Dynamics of a Polymer–Nanoparticle Composite: Effect of Nanoparticle Size and Volume Fraction. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00840] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Valerio Sorichetti
- Laboratoire Charles Coulomb (L2C), CNRS, Univ Montpellier, Montpellier, France
- SPO, Univ Montpellier, INRA, Montpellier SupAgro, Montpellier, France
| | | | - Walter Kob
- Laboratoire Charles Coulomb (L2C), CNRS, Univ Montpellier, Montpellier, France
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16
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Microrheology, advances in methods and insights. Adv Colloid Interface Sci 2018; 257:71-85. [PMID: 29859615 DOI: 10.1016/j.cis.2018.04.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 03/23/2018] [Accepted: 04/14/2018] [Indexed: 01/19/2023]
Abstract
Microrheology is an emerging technique that probes mechanical response of soft material at micro-scale. Generally, microrheology technique can be divided into active and passive versions. During last two decades, extensive efforts have been paid to improve both the experiment techniques and data analysis methods, especially about how to link consequential particle positions into trajectories. We review the recent advances in microrheology, including improvements in labeling, imaging, data acquiring, data processing and data interpretation. Some of the recent insights in soft matter and living systems gained by using this technique are given. Before these, we also give a very brief description of the basic principles of both active and passive microrheology techniques, and some details about optical particle tracking and DWS.
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17
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Chen R, Poling-Skutvik R, Nikoubashman A, Howard MP, Conrad JC, Palmer JC. Coupling of Nanoparticle Dynamics to Polymer Center-of-Mass Motion in Semidilute Polymer Solutions. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02441] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Renjie Chen
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Ryan Poling-Skutvik
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Arash Nikoubashman
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55128 Mainz, Germany
| | - Michael P. Howard
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Jacinta C. Conrad
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Jeremy C. Palmer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
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18
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Kim J, Poling-Skutvik R, Trabuco JRC, Kourentzi K, Willson RC, Conrad JC. Orientational binding modes of reporters in a viral-nanoparticle lateral flow assay. Analyst 2018; 142:55-64. [PMID: 27704069 DOI: 10.1039/c6an00567e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Using microscopy and image analysis, we characterize binding of filamentous viral nanoparticles to a fibrous affinity matrix as models for reporter capture in a lateral flow assay (LFA). M13 bacteriophage (M13) displaying an in vivo-biotinylated peptide (AviTag) genetically fused to the M13 tail protein p3 are functionalized with fluorescent labels. We functionalize glass fiber LFA membranes with antibodies to M13, which primarily capture M13 on the major p8 coat proteins, or with avidin, which captures M13 at the biotin-functionalized tail, and compare orientational modes of reporter capture for the side- versus tip-binding recognition interactions. The number of captured M13 is greater for side-binding than for tip-binding, as expected from the number of recognition groups. Whereas two-thirds of side-bound M13 captured by an anti-M13 antibody bind immediately after colliding with the membrane, tip-bound M13 prominently exhibit three additional orientational modes that require M13 to reorient to enable binding. These results are consistent with the idea that the elongated M13 shape couples with the complex flow field in an open and disordered fibrous LFA membrane to enhance capture.
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Affiliation(s)
- Jinsu Kim
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Ryan Poling-Skutvik
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - João R C Trabuco
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Katerina Kourentzi
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
| | - Richard C Willson
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA. and Department of Biology & Biochemistry, University of Houston, Houston, Texas 77004, USA and Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Monterrey, Nuevo León, Mexico
| | - Jacinta C Conrad
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, TX 77204, USA.
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19
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Lenchenkov NS, Glasbergen G, van Kruijsdijk C, Vulovic M, Bos E, Koning RI, Cassiola F. Characterisation of the size and swelling kinetics of copolymer nano-spheres extracted from an emulsion. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.09.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Chen A, Zhao N, Hou Z. The effect of hydrodynamic interactions on nanoparticle diffusion in polymer solutions: a multiparticle collision dynamics study. SOFT MATTER 2017; 13:8625-8635. [PMID: 29115361 DOI: 10.1039/c7sm01854a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The diffusion of nanoparticles (NPs) in polymer solutions is studied by a combination of a mesoscale simulation method, multiparticle collision dynamics (MPCD), and molecular dynamics (MD) simulations. We investigate the long-time diffusion coefficient D as well as the subdiffusive behavior in the intermediate time region. The dependencies of both D and subdiffusion factor α on NP size and polymer concentration, respectively, are explicitly calculated. Particular attention is paid to the role of hydrodynamic interaction (HI) in the NP diffusion dynamics. Our simulation results show that the long-time diffusion coefficients satisfy perfectly the scaling relation found by experimental observations. Meanwhile, the subdiffusive factor decreases with the increase in polymer concentration but is of little relevance to the NP size. By parallel simulations with and without HI, we reveal that HI will generally enhance D, while the enhancement effect is non-monotonous with increasing polymer concentration, and it becomes most pronounced at semidilute concentrations. With the aid of a scaling law based on the diffusive activation energy model, we understand that HI affects diffusion through decreasing the diffusive activation energy on the one hand while increasing the effective diffusion size on the other. In addition, HI will certainly influence the subdiffusive behavior of the NP, leading to a larger subdiffusion exponent.
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Affiliation(s)
- Anpu Chen
- College of Chemistry, Sichuan University, Chengdu 610064, China.
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Jacob JDC, Krishnamoorti R, Conrad JC. Particle dispersion in porous media: Differentiating effects of geometry and fluid rheology. Phys Rev E 2017; 96:022610. [PMID: 28950508 DOI: 10.1103/physreve.96.022610] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Indexed: 06/07/2023]
Abstract
We investigate the effects of geometric order and fluid rheology on the dispersion of micron-sized particles in two-dimensional microfluidic porous media. Particles suspended in a mixture of glycerol and water or in solutions of partially hydrolyzed polyacrylamide (HPAM) polymers were imaged as they flowed through arrays of microscale posts. From the trajectories of the particles, we calculated the velocity distributions and thereafter obtained the longitudinal and transverse dispersion coefficients. Particles flowed in the shear-thinning HPAM solution through periodic arrays of microposts were more likely to switch between streamlines, due to elastic instabilities. As a result, the distributions of particle velocity were broader in HPAM solutions than in glycerol-water mixtures for ordered geometries. In a disordered array of microposts, however, there was little difference between the velocity distributions obtained in glycerol-water and in HPAM solutions. Correspondingly, particles flowed through ordered post arrays in HPAM solutions exhibited enhanced transverse dispersion. This result suggests that periodic geometric order amplifies the effects of the elasticity-induced velocity fluctuations, whereas geometric disorder of barriers effectively averages out the fluctuations.
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Affiliation(s)
- Jack D C Jacob
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
| | - Ramanan Krishnamoorti
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
- Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Jacinta C Conrad
- Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA
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22
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Parrish E, Caporizzo MA, Composto RJ. Network confinement and heterogeneity slows nanoparticle diffusion in polymer gels. J Chem Phys 2017; 146:203318. [DOI: 10.1063/1.4978054] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Emmabeth Parrish
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA
| | - Matthew A. Caporizzo
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA
| | - Russell J. Composto
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA
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23
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Zhang F, Levine LE, Allen AJ, Campbell CE, Lass EA, Cheruvathur S, Stoudt MR, Williams ME, Idell Y. Homogenization Kinetics of a Nickel-based Superalloy Produced by Powder Bed Fusion Laser Sintering. SCRIPTA MATERIALIA 2017; 131:98-102. [PMID: 28824284 PMCID: PMC5557300 DOI: 10.1016/j.scriptamat.2016.12.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Additively manufactured (AM) metal components often exhibit fine dendritic microstructures and elemental segregation due to the initial rapid solidification and subsequent melting and cooling during the build process, which without homogenization would adversely affect materials performance. In this letter, we report in situ observation of the homogenization kinetics of an AM nickel-based superalloy using synchrotron small angle X-ray scattering. The identified kinetic time scale is in good agreement with thermodynamic diffusion simulation predictions using microstructural dimensions acquired by ex situ scanning electron microscopy. These findings could serve as a recipe for predicting, observing, and validating homogenization treatments in AM materials.
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Affiliation(s)
- Fan Zhang
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Lyle E Levine
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Andrew J Allen
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Carelyn E Campbell
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Eric A Lass
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Sudha Cheruvathur
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Mark R Stoudt
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Maureen E Williams
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Yaakov Idell
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
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24
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Zhang F, Allen AJ, Levine LE, Tsai DH, Ilavsky J. Structure and Dynamics of Bimodal Colloidal Dispersions in a Low-Molecular-Weight Polymer Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2817-2828. [PMID: 28233496 PMCID: PMC5527685 DOI: 10.1021/acs.langmuir.7b00090] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We present an experimental study of the structural and dynamical properties of bimodal, micrometer-sized colloidal dispersions (size ratio ≈ 2) in an aqueous solution of low-molecular-weight polymer (polyethylene glycol 2000) using synchrotron ultra-small angle X-ray scattering (USAXS) and USAXS-based X-ray photon correlation spectroscopy. We fixed the volume fraction of the large particles at 5% and systematically increased the volume fraction of the small particles from 0 to 5% to evaluate their effects on the structure and dynamics. The bimodal dispersions were homogenous through the investigated parameter space. We found that the partial structure factors can be satisfactorily retrieved for the bimodal colloidal dispersions using a Percus-Yevick hard-sphere potential when the size distributions of the particles were taken into account. We also found that the partial structure factor between the large particles did not exhibit a significant variation with increasing volume fraction of the small particles, whereas the isothermal compressibility of the binary mixture was found to decrease with increasing volume fraction of the small particles. The dynamics of single-component large-particle dispersion obey the principles of de Gennes narrowing, where the wave vector dependence of the interparticle diffusion coefficient is inversely proportional to the interparticle structure factor. The dynamics of the bimodal dispersions demonstrate a strong dependence on the fraction of small particles. We also made a comparison between the experimental effective dynamic viscosity of the bimodal dispersion with the theoretical predictions, which suggest that the complex mutual interactions between the large and small particles have a strong effect on the dynamic behaviors of bimodal dispersions.
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Affiliation(s)
- Fan Zhang
- Material Measurement Laboratory, National Institute of Standards and Technology Gaithersburg, MD 20899, USA
| | - Andrew J. Allen
- Material Measurement Laboratory, National Institute of Standards and Technology Gaithersburg, MD 20899, USA
| | - Lyle E. Levine
- Material Measurement Laboratory, National Institute of Standards and Technology Gaithersburg, MD 20899, USA
| | - De-Hao Tsai
- Department of Chemical Engineering, National Tsing Hua University Hsinchu, Taiwan, Republic of China
| | - Jan Ilavsky
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory Argonne, IL 60439, USA
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25
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Volgin IV, Larin SV, Abad E, Lyulin SV. Molecular Dynamics Simulations of Fullerene Diffusion in Polymer Melts. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02050] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Igor V. Volgin
- Institute
of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj
pr. V.O., 31, 199004 Saint Petersburg, Russia
| | - Sergey V. Larin
- Institute
of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj
pr. V.O., 31, 199004 Saint Petersburg, Russia
| | - Enrique Abad
- Departamento
de Física Aplicada and Instituto de Computación Científica
Avanzada (ICCAEX), Centro Universitario de Mérida, Universidad de Extremadura, E-06800 Mérida, Spain
| | - Sergey V. Lyulin
- Institute
of Macromolecular Compounds, Russian Academy of Sciences, Bolshoj
pr. V.O., 31, 199004 Saint Petersburg, Russia
- Physical
Faculty, Saint-Petersburg University, Ulyanovskaya str. 1, 198504 Petrodvorets, Russia
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26
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Ramani M, Mudge MC, Morris RT, Zhang Y, Warcholek SA, Hurst MN, Riviere JE, DeLong RK. Zinc Oxide Nanoparticle-Poly I:C RNA Complexes: Implication as Therapeutics against Experimental Melanoma. Mol Pharm 2017; 14:614-625. [PMID: 28135100 DOI: 10.1021/acs.molpharmaceut.6b00795] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
There is current interest in harnessing the combined anticancer and immunological effect of nanoparticles (NPs) and RNA. Here, we evaluate the bioactivity of poly I:C (pIC) RNA, bound to anticancer zinc oxide NP (ZnO-NP) against melanoma. Direct RNA association to unfunctionalized ZnO-NP is shown by observing change in size, zeta potential, and absorption/fluorescence spectra upon complexation. RNA corona was visualized by transmission electron microscopy (TEM) for the first time. Binding constant (Kb = 1.6-2.8 g-1 L) was determined by modified Stern-Volmer, absorption, and biological surface activity index analysis. The pIC-ZnO-NP complex increased cell death for both human (A375) and mouse (B16F10) cell lines and suppressed tumor cell growth in BALB/C-B16F10 mouse melanoma model. Ex vivo tumor analysis indicated significant molecular activity such as changes in the level of phosphoproteins JNK, Akt, and inflammation markers IL-6 and IFN-γ. High throughput proteomics analysis revealed zinc oxide and poly I:C-specific and combinational patterns that suggested possible utility as an anticancer and immunotherapeutic strategy against melanoma.
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Affiliation(s)
| | - Miranda C Mudge
- Department of Biomedical Science, Missouri State University , Springfield, Missouri 65897, United States
| | - R Tyler Morris
- Department of Biomedical Science, Missouri State University , Springfield, Missouri 65897, United States
| | | | | | - Miranda N Hurst
- Department of Biomedical Science, Missouri State University , Springfield, Missouri 65897, United States
| | | | - Robert K DeLong
- Department of Biomedical Science, Missouri State University , Springfield, Missouri 65897, United States
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Lee J, Grein-Iankovski A, Narayanan S, Leheny RL. Nanorod Mobility within Entangled Wormlike Micelle Solutions. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b02091] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jonghun Lee
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Aline Grein-Iankovski
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Department of Chemistry, Federal University of Parana, Curitiba, PR, Brazil
| | - Suresh Narayanan
- X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Robert L. Leheny
- Department of Physics & Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, United States
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28
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Li SX, Jiang HJ, Hou ZH. Diffusion of Nanoparticles in Semidilute Polymer Solutions: A Multiparticle Collision Dynamics Study. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1603058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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29
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Babayekhorasani F, Dunstan DE, Krishnamoorti R, Conrad JC. Nanoparticle diffusion in crowded and confined media. SOFT MATTER 2016; 12:8407-8416. [PMID: 27714348 DOI: 10.1039/c6sm01543c] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We identify distinct mechanisms controlling slowing of nanoparticle diffusion through complex media featuring both rigid geometrical confinement and soft mobile crowders. Towards this end, we use confocal microscopy and single particle tracking to probe the diffusion of 400 nm nanoparticles suspended in Newtonian water, in a Newtonian glycerol/water mixture, or in a non-Newtonian polymer solution through a model porous medium, a packed bed of microscale glass beads. The mobility of nanoparticles, as quantified by the long-time diffusion coefficient extracted from the particle mean-squared displacement, slows as the average pore size of the packed bed media decreases for both Newtonian and non-Newtonian solutions. The distribution of particle displacements is non-Gaussian, consistent with the spatial heterogeneity of the geometrical confinement imposed by the packed bed. The slowing of nanoparticle mobility in all solutions follows the predictions of models that describe hydrodynamic interactions with the packed bed. In non-Newtonian solutions, depletion interactions due to the polymers near the glass beads result in temporary adsorption of particles onto the bead surface, as indicated by a stretched-exponential distribution of residence times. Our results therefore suggest that the confined diffusive dynamics of nanoparticles in polymer solutions is controlled by two competing mechanisms: hydrodynamic interactions between particles and spatial obstacles, which dictate the long-time slowing of diffusion, and depletion interactions between particles and confining walls due to the macromolecules, which control transient adsorption and hence alter the statistics of the short-time motion.
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Affiliation(s)
| | - Dave E Dunstan
- Chemical and Biomolecular Engineering, University of Melbourne, 3010, Australia
| | - Ramanan Krishnamoorti
- Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA. and Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Jacinta C Conrad
- Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA.
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30
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Motion of Molecular Probes and Viscosity Scaling in Polyelectrolyte Solutions at Physiological Ionic Strength. PLoS One 2016; 11:e0161409. [PMID: 27536866 PMCID: PMC4990340 DOI: 10.1371/journal.pone.0161409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/04/2016] [Indexed: 11/19/2022] Open
Abstract
We investigate transport properties of model polyelectrolyte systems at physiological ionic strength (0.154 M). Covering a broad range of flow length scales-from diffusion of molecular probes to macroscopic viscous flow-we establish a single, continuous function describing the scale dependent viscosity of high-salt polyelectrolyte solutions. The data are consistent with the model developed previously for electrically neutral polymers in a good solvent. The presented approach merges the power-law scaling concepts of de Gennes with the idea of exponential length scale dependence of effective viscosity in complex liquids. The result is a simple and applicable description of transport properties of high-salt polyelectrolyte solutions at all length scales, valid for motion of single molecules as well as macroscopic flow of the complex liquid.
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31
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Pryamitsyn V, Ganesan V. Noncontinuum effects on the mobility of nanoparticles in unentangled polymer solutions. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24138] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Victor Pryamitsyn
- Department of Chemical Engineering; University of Texas at Austin; Austin Texas 78712
| | - Venkat Ganesan
- Department of Chemical Engineering; University of Texas at Austin; Austin Texas 78712
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32
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Babayekhorasani F, Dunstan DE, Krishnamoorti R, Conrad JC. Nanoparticle dispersion in disordered porous media with and without polymer additives. SOFT MATTER 2016; 12:5676-5683. [PMID: 27328208 DOI: 10.1039/c6sm00502k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In purely viscous Newtonian fluids, mechanical mixing of the fluid stream as it moves through an unstructured porous medium controls the long-time dispersion of molecular tracers. In applications ranging from environmental remediation to materials processing, however, particles are transported through porous media in polymer solutions and melts, for which the fluid properties depend on the shear rate and extent of deformation. How the flow characteristics of polymer solutions affect the spreading of finite-sized particles remains poorly understood - both on the microscopic scale as local velocity profiles, and on the macroscale as dispersion. Here, we show across a range of flow rates and disordered porous media configurations that the long-time transport coefficients of particles flowed in water, in a viscous Newtonian fluid, and in a non-Newtonian shear-thinning polymer solution collapse onto scaling curves, independent of the fluid rheology. Thus the addition of polymer does not impact nanoparticle dispersion through disordered porous media.
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Affiliation(s)
| | - Dave E Dunstan
- Chemical and Biomolecular Engineering, University of Melbourne, 3010, Australia
| | - Ramanan Krishnamoorti
- Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA. and Department of Chemistry, University of Houston, Houston, Texas 77204, USA
| | - Jacinta C Conrad
- Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, USA.
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33
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Rheological characterization of konjac glucomannan in concentrated solutions. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2016. [DOI: 10.1007/s11694-015-9296-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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34
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Phillies GDJ. Interpretation of fluorescence correlation spectra of biopolymer solutions. Biopolymers 2016; 105:260-6. [DOI: 10.1002/bip.22802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 12/22/2015] [Accepted: 12/31/2015] [Indexed: 11/12/2022]
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35
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Menzel AM. Velocity and displacement statistics in a stochastic model of nonlinear friction showing bounded particle speed. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:052302. [PMID: 26651690 DOI: 10.1103/physreve.92.052302] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Indexed: 06/05/2023]
Abstract
Diffusion of colloidal particles in a complex environment such as polymer networks or biological cells is a topic of high complexity with significant biological and medical relevance. In such situations, the interaction between the surroundings and the particle motion has to be taken into account. We analyze a simplified diffusion model that includes some aspects of a complex environment in the framework of a nonlinear friction process: at low particle speeds, friction grows linearly with the particle velocity as for regular viscous friction; it grows more than linearly at higher particle speeds; finally, at a maximum of the possible particle speed, the friction diverges. In addition to bare diffusion, we study the influence of a constant drift force acting on the diffusing particle. While the corresponding stationary velocity distributions can be derived analytically, the displacement statistics generally must be determined numerically. However, as a benefit of our model, analytical progress can be made in one case of a special maximum particle speed. The effect of a drift force in this case is analytically determined by perturbation theory. It will be interesting in the future to compare our results to real experimental systems. One realization could be magnetic colloidal particles diffusing through a shear-thickening environment such as starch suspensions, possibly exposed to an external magnetic field gradient.
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Affiliation(s)
- Andreas M Menzel
- Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
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36
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Poling-Skutvik R, Krishnamoorti R, Conrad JC. Size-Dependent Dynamics of Nanoparticles in Unentangled Polyelectrolyte Solutions. ACS Macro Lett 2015; 4:1169-1173. [PMID: 35614800 DOI: 10.1021/acsmacrolett.5b00616] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mobility of polystyrene nanoparticles ranging in diameter from 300 nm to 2 μm was measured in dilute and semidilute solutions of partially hydrolyzed polyacrylamide. In this model system, the ratio of particle to polymer size controls the long-time diffusivity of nanoparticles. The particle dynamics transition from subdiffusive on short time scales to Fickian on long time scales, qualitatively similar to predictions for polymer dynamics using a Rouse model. The diffusivities extracted from the long-time Fickian regime, however, are larger than those predicted by the Stokes-Einstein equation and the bulk zero-shear viscosity and moreover do not collapse according to hydrodynamic models. The size-dependent deviations of the long-time particle diffusivities derive instead from the coupling between the dynamics of the particle and the polymer over the length scale of the particle. Although the long-time diffusivities collapse according to predictions, deviations of the short-time scaling exponents and the crossover time between subdiffusive and Fickian dynamics indicate that the particles are only partially coupled to the relaxation modes of the polymer.
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Affiliation(s)
- Ryan Poling-Skutvik
- Department of Chemical and
Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Ramanan Krishnamoorti
- Department of Chemical and
Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Jacinta C. Conrad
- Department of Chemical and
Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
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37
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