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Brouzet C, Mittal N, Rosén T, Takeda Y, Söderberg LD, Lundell F, Takana H. Effect of Electric Field on the Hydrodynamic Assembly of Polydisperse and Entangled Fibrillar Suspensions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8339-8347. [PMID: 34176263 DOI: 10.1021/acs.langmuir.1c01196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Dynamics of colloidal particles can be controlled by the application of electric fields at micrometer-nanometer length scales. Here, an electric field-coupled microfluidic flow-focusing device is designed for investigating the effect of an externally applied alternating current (AC) electric field on the hydrodynamic assembly of cellulose nanofibrils (CNFs). We first discuss how the nanofibrils align parallel to the direction of the applied field without flow. Then, we apply an electric field during hydrodynamic assembly in the microfluidic channel and observe the effects on the mechanical properties of the assembled nanostructures. We further discuss the nanoscale orientational dynamics of the polydisperse and entangled fibrillar suspension of CNFs in the channel. It is shown that electric fields induced with the electrodes locally increase the degree of orientation. However, hydrodynamic alignment is demonstrated to be much more efficient than the electric field for aligning CNFs. The results are useful for understanding the development of the nanostructure when designing high-performance materials with microfluidics in the presence of external stimuli.
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Affiliation(s)
- Christophe Brouzet
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Nitesh Mittal
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Tomas Rosén
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Yusuke Takeda
- Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - L Daniel Söderberg
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Fredrik Lundell
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Hidemasa Takana
- Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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Brouzet C, Mittal N, Lundell F, Söderberg LD. Characterizing the Orientational and Network Dynamics of Polydisperse Nanofibers on the Nanoscale. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02714] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Christophe Brouzet
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Nitesh Mittal
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Fredrik Lundell
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - L. Daniel Söderberg
- Wallenberg Wood Science Center and Linné FLOW Centre, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
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Brouzet C, Mittal N, Söderberg LD, Lundell F. Size-Dependent Orientational Dynamics of Brownian Nanorods. ACS Macro Lett 2018; 7:1022-1027. [PMID: 35650955 DOI: 10.1021/acsmacrolett.8b00487] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Successful assembly of suspended nanoscale rod-like particles depends on fundamental phenomena controlling rotational and translational diffusion. Despite the significant developments in fluidic fabrication of nanostructured materials, the ability to quantify the dynamics in processing systems remains challenging. Here we demonstrate an experimental method for characterization of the orientation dynamics of nanorod suspensions in assembly flows using orientation relaxation. This relaxation, measured by birefringence and obtained after rapidly stopping the flow, is deconvoluted with an inverse Laplace transform to extract a length distribution of aligned nanorods. The methodology is illustrated using nanocelluloses as model systems, where the coupling of rotational diffusion coefficients to particle size distributions as well as flow-induced orientation mechanisms are elucidated.
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Affiliation(s)
- Christophe Brouzet
- Linné FLOW Centre, KTH Mechanics, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
- Wallenberg Wood Science Center, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Nitesh Mittal
- Linné FLOW Centre, KTH Mechanics, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
- Wallenberg Wood Science Center, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - L. Daniel Söderberg
- Linné FLOW Centre, KTH Mechanics, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
- Wallenberg Wood Science Center, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
| | - Fredrik Lundell
- Linné FLOW Centre, KTH Mechanics, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
- Wallenberg Wood Science Center, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
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Munialo CD, Martin AH, van der Linden E, de Jongh HHJ. Fibril formation from pea protein and subsequent gel formation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:2418-27. [PMID: 24564788 DOI: 10.1021/jf4055215] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The objective of this study was to characterize fibrillar aggregates made using pea proteins, to assemble formed fibrils into protein-based gels, and to study the rheological behavior of these gels. Micrometer-long fibrillar aggregates were observed after pea protein solutions had been heated for 20 h at pH 2.0. Following heating of pea proteins, it was observed that all of the proteins were hydrolyzed into peptides and that 50% of these peptides were assembled into fibrils. Changes on a structural level in pea proteins were studied using circular dichroism, transmission electron microscopy, and particle size analysis. During the fibril assembly process, an increase in aggregate size was observed, which coincided with an increase in thioflavin T binding, indicating the presence of β-sheet aggregates. Fibrils made using pea proteins were more branched and curly. Gel formation of preformed fibrils was induced by slow acidification from pH 7.0 to a final pH of around pH 5.0. The ability of pea protein-based fibrillar gels to fracture during an amplitude sweep was comparable to those of soy protein and whey protein-based fibrillar gels, although gels prepared from fibrils made using pea protein and soy protein were weaker than those of whey protein. The findings show that fibrils can be prepared from pea protein, which can be incorporated into protein-based fibrillar gels.
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Affiliation(s)
- Claire Darizu Munialo
- Top Institute Food and Nutrition, P.O. Box 557, 6700 AN, Wageningen, The Netherlands
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Lee CF. Length distribution of stiff, self-assembled polymers at thermal equilibrium. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:415101. [PMID: 22945455 DOI: 10.1088/0953-8984/24/41/415101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We investigate the length distribution of self-assembled, long and stiff polymers at thermal equilibrium. Our analysis is based on calculating the partition functions of stiff polymers of variable lengths in the elastic regime. Our conclusion is that the length distribution of this self-assembled system follows closely the exponential distribution, except at the short length limit. We then discuss the implications of our results on the experimentally observed length distributions in amyloid fibrils.
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Affiliation(s)
- Chiu Fan Lee
- Department of Bioengineering, Imperial College London, South Kensington Campus, London, UK.
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Lee CF. Self-assembly of protein amyloids: a competition between amorphous and ordered aggregation. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:031922. [PMID: 19905161 DOI: 10.1103/physreve.80.031922] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Revised: 08/12/2009] [Indexed: 05/28/2023]
Abstract
Protein aggregation in the form of amyloid fibrils has important biological and technological implications. Although the self-assembly process is highly efficient, aggregates not in the fibrillar form would also occur and it is important to include these disordered species when discussing the thermodynamic equilibrium behavior of the system. Here, we initiate such a task by considering a mixture of monomeric proteins and the corresponding aggregates in the disordered form (micelles) and in the fibrillar form (amyloid fibrils). Starting with a model on the respective binding free energies for these species, we calculate their concentrations at thermal equilibrium. We then discuss how the incorporation of the disordered structure furthers our understanding on the various amyloid promoting factors observed empirically, and on the kinetics of fibrilization.
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Affiliation(s)
- Chiu Fan Lee
- Physics Department, Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, United Kingdom.
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Abstract
β-lactoglobulin is a protein of huge importance to the food industry, and as such it has been extensively studied by the food community sui generis. However, recently there has been an increasing number of studies approaching the protein from a soft matter perspective. Here it is shown how its behaviour can be seen to be generic, in so far as its forms of aggregation are actually typical of many other proteins under comparable conditions, and hence that it is useful to seek unifying mechanisms for its behaviour.
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Affiliation(s)
- Athene M Donald
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, UKCB3 0HE
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Rogers SS, Venema P, van der Ploeg JPM, van der Linden E, Sagis LMC, Donald AM. Investigating the permanent electric dipole moment of β-lactoglobulin fibrils, using transient electric birefringence. Biopolymers 2006; 82:241-52. [PMID: 16489587 DOI: 10.1002/bip.20483] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Amyloid fibrils, which are polymeric assemblies of protein molecules, have been intensively studied on a structural level, yet due to complications such as the disorder within the molecules, several aspects of their structure remain mysterious. Similarly, the kinetics of assembly are not well understood. Here we investigate the electric dipole moment of beta-lactoglobulin fibrils, a model amyloid fibril system, by applying the technique of transient electric birefringence. This moment appears to be large, and comparable to the total moment of the constituent protein monomers if they were joined in a chain, head-to-tail, without changing conformation, suggesting an ordered joining of monomers in the fibril. Such an ordered assembly may have implications for the assembly mechanism of beta-lactoglobulin fibrils in particular, and amyloid fibrils in general.
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Affiliation(s)
- S S Rogers
- Cavendish Laboratory, Department of Physics, Cambridge University, Cambridge, CB3 0HE, UK
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