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Duarte LKR, Teixeira AVNC, Rizzi LG. Microrheology of semiflexible filament solutions based on relaxation simulations. SOFT MATTER 2021; 17:2920-2930. [PMID: 33587085 DOI: 10.1039/d0sm01976c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We present an efficient computational methodology to obtain the viscoelastic response of dilute solutions of semiflexible filaments. By considering an approach based on the fluctuation-dissipation theorem, we were able to evaluate the dynamical properties of probe particles immersed in solutions of semiflexible filaments from relaxation simulations with a relatively low computational cost and higher precision in comparison to those based on stochastic dynamics. We used a microrheological approach to obtain the complex shear modulus and the complex viscosity of the solution through its compliance which was obtained directly from the dynamical properties of a probe particle attached to an effective medium described by a mesoscopic model, i.e., an effective filament model (EFM). The relaxation simulations were applied to assess the effects of the bending energy on the viscoelasticity of the semiflexible filament solutions, and our methodology was validated by comparing the numerical results to the experimental data on DNA and collagen solutions.
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Affiliation(s)
- L K R Duarte
- Departamento de Física, Universidade Federal do Viçosa, CEP 36570-000, Viçosa, MG, Brazil. and Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, CEP 35588-000, Arcos, MG, Brazil
| | - A V N C Teixeira
- Departamento de Física, Universidade Federal do Viçosa, CEP 36570-000, Viçosa, MG, Brazil.
| | - L G Rizzi
- Departamento de Física, Universidade Federal do Viçosa, CEP 36570-000, Viçosa, MG, Brazil.
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Li Q, Peng X, Chen D, McKenna GB. The Laplace approach in microrheology. SOFT MATTER 2020; 16:3378-3383. [PMID: 32211631 DOI: 10.1039/c9sm02242b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
When coupled with the generalized Stokes-Einstein (GSE) equation, it is often reported that micro-rheology probes the dynamic properties differently than do macroscopic rheological measurements, especially in relatively condensed systems. In the present work, we empirically examine the GSE in its widely used form: following an analytical continuation, the Fourier transformed particle mean-square displacement (MSD) is used to determine the dynamic moduli [G'(ω) and G''(ω)] and we compare the results with those obtained by direct inverse Laplace transform calculation of the relevant viscoelastic functions (either relaxation modulus or creep compliance) from the MSD. The results show that the inverse Laplace approaches can differ from the Fourier approach and give better agreement with macroscopic rheological measurements when this is the case. Some instances of agreement between the Fourier approach and the direct Laplace transform approaches are also shown. It is recommended that micro-rheology MSD data be interpreted using one of the direct Laplace transform based approaches.
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Affiliation(s)
- Qi Li
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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Lang C, Hendricks J, Zhang Z, Reddy NK, Rothstein JP, Lettinga MP, Vermant J, Clasen C. Effects of particle stiffness on the extensional rheology of model rod-like nanoparticle suspensions. SOFT MATTER 2019; 15:833-841. [PMID: 30488939 DOI: 10.1039/c8sm01925h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The linear and nonlinear rheological behavior of two rod-like particle suspensions as a function of concentration is studied using small amplitude oscillatory shear, steady shear and capillary breakup extensional rheometry. The rod-like suspensions are composed of fd virus and its mutant fdY21M, which are perfectly monodisperse, with a length on the order of 900 nm. The particles are semiflexible yet differ in their persistence length. The effect of stiffness on the rheological behavior in both, shear and extensional flow, is investigated experimentally. The linear viscoelastic shear data is compared in detail with theoretical predictions for worm-like chains. The extensional properties are compared to Batchelor's theory, generalized for the shear thinning nature of the suspensions. Theoretical predictions agree well with the measured complex moduli at low concentrations as well as the nonlinear shear and elongational viscosities at high flow rates. The results in this work provide guidelines for enhancing the elongational viscosity based on purely frictional effects in the absence of strong normal forces which are characteristic for high molecular weight polymers.
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Affiliation(s)
- Christian Lang
- Institute of Complex Systems-3, Forschungszentrum Jülich, 52428 Jülich, Germany.
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Gutiérrez-Sosa C, Merino-González A, Sánchez R, Kozina A, Díaz-Leyva P. Microscopic Viscoelasticity of Polymer Solutions and Gels Observed from Translation and Rotation of Anisotropic Colloid Probes. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Carlos Gutiérrez-Sosa
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Arturo Merino-González
- Instituto de Química, Universidad Nacional Autónoma de México, P.O.
Box 70-213, 04510 Mexico City, Mexico
| | - Rodrigo Sánchez
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
| | - Anna Kozina
- Instituto de Química, Universidad Nacional Autónoma de México, P.O.
Box 70-213, 04510 Mexico City, Mexico
| | - Pedro Díaz-Leyva
- Departamento de Física, Universidad Autónoma Metropolitana Iztapalapa, San Rafael Atlixco 186, 09340 Mexico City, Mexico
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Tavera-Vázquez A, Arenas-Gómez B, Garza C, Liu Y, Castillo R. Structure, rheology, and microrheology of wormlike micelles made of PB-PEO diblock copolymers. SOFT MATTER 2018; 14:7264-7276. [PMID: 30140801 DOI: 10.1039/c8sm01530a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A diblock copolymer made of poly(1,4-butadiene)-block-polyethylene oxide, with a degree of polymerization of the polybutadiene and polyethylene oxide blocks of 37 and 57, respectively, self-assembles in water as worm-like micelles determined by small angle neutron scattering with an average diameter of ∼12.7 nm, a core radius of ∼2.7 nm, a shell radius of ∼3 nm, and an estimated persistence length of >225 nm. Worm-like micelles of almost the same diblock copolymer, but with a smaller polyethylene oxide block (degree of polymerization 45) were also measured. The worm-like micelles were also observed with negative staining using low energy electron microscopy. The boundary between dilute and semidilute regimes was estimated to be ∼0.8 wt%. The viscoelastic spectra at low and intermediate frequencies do not follow the Maxwell model. These micelles do not present the same rheological behavior of worm-like micelle solutions of conventional surfactants. The slow dynamics of the self-assembly explains this uncommon behavior for the system. Any micellar rearrangement is impeded due to the extremely high hydrophobicity of the polybutadiene block; stress mainly relaxes by the reptation mechanism. Using diffusive wave spectroscopy, we measured the mean square displacement of particles in the micellar solution. From the mean square displacement, we obtained G'(ω) and G''(ω) at high frequencies. |G*| exhibits a power law behavior showing the stress relaxation changes as frequency increases, first dominated by the Rouse-Zimm modes and then by the bending modes of the Kuhn segments. This allowed us to estimate the worm-like micelle persistence lengths that depend on the copolymer concentration.
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Affiliation(s)
- Antonio Tavera-Vázquez
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000, México City, Mexico.
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Niederquell A, Machado AHE, Kuentz M. A diffusing wave spectroscopy study of pharmaceutical emulsions for physical stability assessment. Int J Pharm 2017; 530:213-223. [PMID: 28720536 DOI: 10.1016/j.ijpharm.2017.07.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 07/10/2017] [Accepted: 07/11/2017] [Indexed: 11/26/2022]
Abstract
Emulsions are broadly used in pharmaceutics either as intermediate products or as final dosage forms. Such disperse systems are only kinetically stabilized and therefore early detection of physical instability is highly desirable. This work employed diffusing wave spectroscopy (DWS) to study a series of model emulsions that were categorized, based on their composition, as either "simple" or "complex". DWS data were compared with results of droplet size imaging, apparent viscosity obtained by microfluidics, and near-infrared (NIR) analytical centrifugation. A mathematical model of the droplet mean square displacement (MSD) was modified by us regarding improved fitting of experimental data. Although the emulsions showed different types of instability like creaming and sedimentation, a good rank correlation was found between the DWS parameters and results from the comparative stability methods. Our findings indicate that DWS provides a highly attractive method for stability analysis of pharmaceutical emulsions because it requires only low sample volumes, is rapid and non-invasive. The proposed data modeling provides the means for a better understanding of emulsion microstructure that in turn will help designing quality into pharmaceutical dispersions.
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Affiliation(s)
- Andreas Niederquell
- University of Applied Sciences and Arts Northwestern Switzerland, Institute of Pharma Technology, Gründenstr. 40, CH-4132 Muttenz, Switzerland
| | - Alexandra H E Machado
- University of Applied Sciences and Arts Northwestern Switzerland, Institute of Pharma Technology, Gründenstr. 40, CH-4132 Muttenz, Switzerland
| | - Martin Kuentz
- University of Applied Sciences and Arts Northwestern Switzerland, Institute of Pharma Technology, Gründenstr. 40, CH-4132 Muttenz, Switzerland.
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Yang H, Kang W, Wu H, Li Z, Yu Y, Lu Y, Zhang L, Wang M, He Y. Passive microrheology for measurement of gelation behavior of a kind of polymer gel P(AM-AA-AMPS). J Appl Polym Sci 2016. [DOI: 10.1002/app.43364] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Hongbin Yang
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Wanli Kang
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
- School of Petroleum Engineering; China University of Petroleum (East China) Qingdao, Shandong 266580 China
| | - Hairong Wu
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Zhe Li
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Yang Yu
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Yao Lu
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Liming Zhang
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Manying Wang
- Enhanced Oil Recovery Research Institute, China University of Petroleum (Beijing); Changping District Beijing 102249 China
| | - Yuwei He
- Beijing LDS Technology Co. Ltd; Chaoyang District Beijing 100101 China
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Liu S, Zan T, Chen S, Pei X, Li H, Zhang Z. Thermoresponsive Chiral to Nonchiral Ordering Transformation in the Nematic Liquid-Crystal Phase of Rodlike Viruses: Turning the Survival Strategy of a Virus into Valuable Material Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6995-7005. [PMID: 26053642 DOI: 10.1021/acs.langmuir.5b01476] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The current work investigates the thermoresponsive in situ chiral to nonchiral ordering transformation of a rodlike virus in the naturally assembled state-the chiral nematic liquid crystal (CLC) phase. We take this as an elegant example of reconfigurable self-assembly, through which it is possible to realize in situ transformation from one assembled state to another without disrupting the preformed assembly in general or going through a secondary assembling procedure of the disassembled building blocks. The detailed investigation presented here reveals many unique characteristics of the thermoresponsive 3D chiral ordering of rodlike viruses induced by heat stress. The chiral to nonchiral ordering transformation is highly reversible in the temperature range of up to 60 °C and can be repeated many times. There exists a critical temperature around 40 °C which is independent of the ionic strength and virus concentration. Such reconfigurable ordering in the CLC phase stems from the intrinsic structure change of constituent coat proteins without disrupting the structural integrity of the virus, as revealed by three analytical techniques targeting levels ranging from the molecular, secondary conformation of the constituent proteins to the whole single virus, respectively. Such structural flexibility, also termed polymorphism, is relative to the survival strategies of a biological organism such as the virus and can be transformed into very precious material properties. The potential of the virus-based CLC phase as the chiral matrix to regulate chiro-optical properties of gold nanorods is also presented.
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Affiliation(s)
- Shuaiyu Liu
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Tingting Zan
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- ‡School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Si Chen
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiaodong Pei
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Henmin Li
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhenkun Zhang
- †Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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Marvin DA, Symmons MF, Straus SK. Structure and assembly of filamentous bacteriophages. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2014; 114:80-122. [PMID: 24582831 DOI: 10.1016/j.pbiomolbio.2014.02.003] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Accepted: 02/09/2014] [Indexed: 12/24/2022]
Abstract
Filamentous bacteriophages are interesting paradigms in structural molecular biology, in part because of the unusual mechanism of filamentous phage assembly. During assembly, several thousand copies of an intracellular DNA-binding protein bind to each copy of the replicating phage DNA, and are then displaced by membrane-spanning phage coat proteins as the nascent phage is extruded through the bacterial plasma membrane. This complicated process takes place without killing the host bacterium. The bacteriophage is a semi-flexible worm-like nucleoprotein filament. The virion comprises a tube of several thousand identical major coat protein subunits around a core of single-stranded circular DNA. Each protein subunit is a polymer of about 50 amino-acid residues, largely arranged in an α-helix. The subunits assemble into a helical sheath, with each subunit oriented at a small angle to the virion axis and interdigitated with neighbouring subunits. A few copies of "minor" phage proteins necessary for infection and/or extrusion of the virion are located at each end of the completed virion. Here we review both the structure of the virion and aspects of its function, such as the way the virion enters the host, multiplies, and exits to prey on further hosts. In particular we focus on our understanding of the way the components of the virion come together during assembly at the membrane. We try to follow a basic rule of empirical science, that one should chose the simplest theoretical explanation for experiments, but be prepared to modify or even abandon this explanation as new experiments add more detail.
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Affiliation(s)
- D A Marvin
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.
| | - M F Symmons
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK
| | - S K Straus
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.
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Sarmiento-Gomez E, Santamaría-Holek I, Castillo R. Mean-Square Displacement of Particles in Slightly Interconnected Polymer Networks. J Phys Chem B 2014; 118:1146-58. [DOI: 10.1021/jp4105344] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erick Sarmiento-Gomez
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-264, México, D.F. 01000, Mexico
| | - Iván Santamaría-Holek
- UMDI Facultad
de Ciencias, Universidad Nacional Autónoma de México, Campus
Juriquilla, Querétaro 76230, México
| | - Rolando Castillo
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-264, México, D.F. 01000, Mexico
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Montalvan-Sorrosa D, González-Solis JL, Mas-Oliva J, Castillo R. Filamentous virus decoration with gold nanoparticles: global fingerprints of bionanocomposites acquired with SERS. RSC Adv 2014. [DOI: 10.1039/c4ra10656c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A bioconjugation reaction is used to obtain fd viruses with one gold nanoparticle at the tip and gold nanowire-like structures.
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Affiliation(s)
| | - J. L. González-Solis
- Centro Universitario de los Lagos
- Universidad de Guadalajara
- Lagos de Moreno, Mexico
| | - J. Mas-Oliva
- Instituto de Fisiología Celular
- Universidad Nacional Autónoma de México
- , Mexico
| | - R. Castillo
- Instituto de Física
- Universidad Nacional Autónoma de México
- , Mexico
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Hernández-Contreras M. Translational and rotational dynamics of colloidal particles in suspension: effect of shear. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:022317. [PMID: 24032842 DOI: 10.1103/physreve.88.022317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 06/28/2013] [Indexed: 06/02/2023]
Abstract
We report a generalization of a nonequilibrium thermodynamic theory for the mesoscopic dynamics of radially symmetric interacting particles to anisotropic pairwise interactions and attain the one- and two-particle Fokker-Planck kinetics equations at a low-density limit that provides the translational-rotational coupling of their motion due to hydrodynamic interactions, from which we derived the balance equations of linear, angular momentum, and energy dissipation due to particle interactions and energy interchange with heat bath. In this low-density approximation, an already-known virial expression for the long-time translational collective diffusion coefficient of an orientational isotropic suspension in terms of the fluid equilibrium microstructure is recovered. An external shear flow induces, in the diffusive regime, vorticity effects into the rotational diffusion property of the colloidal particles. They manifest in the appearance of the particle's rotational viscosity due to vortex flow. The Smoluchowski equation that governs the dynamical relaxation of colloid microstructure due to particle's Brownian motion under stationary flow is provided.
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Affiliation(s)
- M Hernández-Contreras
- Departamento de Física, Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional Apartado Postal 14-740, México Distrito Federal, México
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