1
|
Zhu S, Underhill PT. Stochastic kinetic theory applied to coarse-grained polymer model. J Chem Phys 2024; 160:114903. [PMID: 38506294 DOI: 10.1063/5.0186783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 02/28/2024] [Indexed: 03/21/2024] Open
Abstract
A stochastic field theory approach is applied to a coarse-grained polymer model that will enable studies of polymer behavior under non-equilibrium conditions. This article is focused on the validation of the new model in comparison with explicit Langevin equation simulations under conditions with analytical solutions. The polymers are modeled as Hookean dumbbells in one dimension, without including hydrodynamic interactions and polymer-polymer interactions. Stochastic moment equations are derived from full field theory. The accuracy of the field theory and moment equations is quantified using autocorrelation functions. The full field theory is only accurate for a large number of polymers due to keeping track of rare occurrences of polymers with a large stretch. The moment equations do not have this error because they do not explicitly track these configurations. The accuracy of both methods depends on the spatial degree of discretization. The timescale of decorrelation over length scales bigger than the spatial discretization is accurate, while there is an error over the scale of single mesh points.
Collapse
Affiliation(s)
- Shangren Zhu
- Rensselaer Polytechnic Institute, 110 8th St., Troy, New York 12180, USA
| | | |
Collapse
|
2
|
Helsper S, Hatem WA, Young L, Wilhelm Z, Liberatore MW. Flow and crystallization of saturated fatty acid methyl esters and their binary mixtures. J AM OIL CHEM SOC 2022. [DOI: 10.1002/aocs.12598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sedi Helsper
- Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | - Wesam A. Hatem
- Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | - Lisa Young
- Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | - Zane Wilhelm
- Department of Chemical Engineering University of Toledo Toledo Ohio USA
| | | |
Collapse
|
3
|
Rheological characterization of β-lactoglobulin/lactoferrin complex coacervates. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
4
|
Patel L, Mansour O, Bryant H, Abdullahi W, Dalgliesh RM, Griffiths PC. Interaction of Low Molecular Weight Poly(diallyldimethylammonium chloride) and Sodium Dodecyl Sulfate in Low Surfactant-Polyelectrolyte Ratio, Salt-Free Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8815-8825. [PMID: 32668905 DOI: 10.1021/acs.langmuir.0c01149] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Coacervation is widely used in formulations to induce a beneficial character to the formulation, but nonequilibrium effects are often manifest. Electrophoretic NMR (eNMR), pulsed-gradient spin-echo NMR (PGSE-NMR), and small-angle neutron scattering (SANS) have been used to quantify the interaction between low molecular cationic poly(diallyldimethylammonium chloride) (PDADMAC) and the anionic surfactant sodium dodecyl sulfate (SDS) in aqueous solution as a model for the precursor state to such nonequilibrium processes. The NMR data show that, within the low surfactant concentration one-phase region, an increasing surfactant concentration leads to a reduction in the charge on the polymer and a collapse of its solution conformation, attaining minimum values coincident with the macroscopic phase separation boundary. Interpretation of the scattering data reveals how the rodlike polymer changes over the same surfactant concentration window, with no discernible fingerprint of micellar type aggregates, but rather with the emergence of disklike and lamellar structures. At the highest surfactant concentration, the emergence of a weak Bragg peak in both the polymer and surfactant scattering suggests these precursor disk and lamellar structures evolve into paracrystalline stacks which ultimately phase separate. Addition of the nonionic surfactant hexa(ethylene glycol) monododecyl ether (C12E6) to the system seems to have little effect on the PDADMAC/SDS interaction as determined by NMR, merely displacing the observed behavior to lower SDS concentrations, commensurate with the total SDS present in the system. In other words, PDADMAC causes the disruption of the mixed SDS/C12E6 micelle, leading to SDS-rich PDADAMC/surfactant complexes coexisting with C12E6-rich micelles in solution.
Collapse
Affiliation(s)
- Leesa Patel
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Omar Mansour
- Faculty of Health and Life Sciences, Leicester School of Pharmacy, De Montfort University, The Gateway, Leicester, LE1 9BH, U.K
| | - Hannah Bryant
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Wasiu Abdullahi
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| | - Robert M Dalgliesh
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, U.K
| | - Peter C Griffiths
- Faculty of Engineering and Science, School of Science, University of Greenwich, Chatham, ME4 4TB, U.K
| |
Collapse
|
5
|
Narayanan A, Menefee JR, Liu Q, Dhinojwala A, Joy A. Lower Critical Solution Temperature-Driven Self-Coacervation of Nonionic Polyester Underwater Adhesives. ACS NANO 2020; 14:8359-8367. [PMID: 32538616 DOI: 10.1021/acsnano.0c02396] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To enable attachment to underwater surfaces, aquatic fauna such as mussels and sandcastle worms utilize the advantages of coacervation to deliver concentrated protein-rich adhesive cocktails in an aqueous environment onto underwater surfaces. Recently, a mussel adhesive protein Mfp-3s, was shown to exhibit a coacervation-based adhesion mechanism. Current synthetic strategies to mimic Mfp-3s often involve complexation of oppositely charged polymers. Such complex coacervates are more sensitive to changes in pH and salt, thereby limiting their utility to narrow ranges of pH and ionic strength. In this study, by taking advantage of the lower critical solution temperature-driven coacervation, we have created mussel foot protein-inspired, tropoelastin-like, bioabsorbable, nonionic, self-coacervating polyesters for the delivery of photo-cross-linkable adhesives underwater and to overcome the challenges of adhesion in wet or underwater environments. We describe the rationale for their design and the underwater adhesive properties of these nonionic adhesives. Compared to previously reported coacervate adhesives, these "charge-free" polyesters coacervate in wide ranges of pH (3-12) and ionic strength (0-1 M NaCl) and rapidly (<300 s) adhere to substrates submerged underwater. The study introduces smart materials that mimic the self-coacervation and environmental stability of Mfp-3s and demonstrate the potential for biological adhesive applications where high water content, salts, and pH changes can be expected.
Collapse
Affiliation(s)
- Amal Narayanan
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Joshua R Menefee
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Qianhui Liu
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Ali Dhinojwala
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| | - Abraham Joy
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, United States
| |
Collapse
|
6
|
Jing H, Bai Q, Lin Y, Chang H, Yin D, Liang D. Fission and Internal Fusion of Protocell with Membraneless "Organelles" Formed by Liquid-Liquid Phase Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:8017-8026. [PMID: 32584581 DOI: 10.1021/acs.langmuir.0c01864] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Construction of protocells with hierarchical structures and living functions is still a great challenge. Growing evidence demonstrates that the membraneless organelles, which facilitate many essential cellular processes, are formed by RNA, protein, and other biopolymers via liquid-liquid phase separation (LLPS). The formation of the protocell in the early days of Earth could follow the same principle. In this work, we develop a novel coacervate-based protocell containing membraneless subcompartments via spontaneous liquid-liquid phase separation by simply mixing single-stranded oligonucleotides (ss-oligo), quaternized dextran (Q-dextran), and poly(l-lysine) (PLL) together. The resulting biphasic droplet, with PLL/ss-oligo phase being the internal subcompartments and Q-dextran/ss-oligo phase as the surrounding medium, is capable of sequestering and partitioning biomolecules into distinct regions. When the droplet is exposed to salt or Dextranase, the surrounding Q-dextran/ss-oligo phase will be gradually dissociated, resulting in the chaotic movement and fusion of internal subcompartments. Besides, the external electric field at a lower strength can drive the biphasic droplet to undergo a deviated circulation concomitant with the fusion of localized subcompartments, while a high-strength electric field can polarize the whole droplet, resulting in the release of daughter droplets in a controllable manner. Our study highlights that liquid-liquid phase separation of biopolymers is a powerful strategy to construct hierarchically structured protocells resembling the morphology and functions of living cells and provides a step toward a better understanding of the transition mechanism from nonliving to living matter under prebiotic conditions.
Collapse
Affiliation(s)
- Hairong Jing
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Qingwen Bai
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ya'nan Lin
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Haojing Chang
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Dongxiao Yin
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Dehai Liang
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Polymer Chemistry and Physics, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| |
Collapse
|
7
|
Feddaoui W, Aschi A, Bey H, Othman T. Study of the complex coacervation mechanism between ovalbumin and the strong polyanion PSSNa: influence of temperature and pH. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2019; 48:803-811. [PMID: 31655892 DOI: 10.1007/s00249-019-01406-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 09/10/2019] [Accepted: 10/13/2019] [Indexed: 01/18/2023]
Abstract
We studied the complex between ovalbumin and long flexible poly-(sodium 4-styrene sulfonate) as a function of pH and temperature. We used various techniques [turbidimetry, conductometry, dynamic light scattering, viscosimetry, and ultra-small-angle light scattering (USALS)] to fully characterize the coacervate complex. Different phases of complexation versus temperature were determined by turbidimetric analysis (pHc, pHϕ1, and pHϕ2). The optimal protein/polyelectrolyte interaction occurred at pHopt 4. An increase in temperature made the hydrophobic interactions more favorable in the case of the soluble complex and complex coacervation phases (pH > pHϕ2). We systematically determined the activation energy to follow the conformational changes of the complex at different temperatures. At pHopt, the size of the formed complex showed a remarkable decrease with temperature increase. USALS was used to determine simultaneously the radius of gyration (Rg) and fractal dimension Df of the coacervate.
Collapse
Affiliation(s)
- Wafa Feddaoui
- Faculté Des Sciences de Tunis, LR99ES16 Laboratoire Physique de La Matière Molle Et de La Modélisation Électromagnétique, Université de Tunis El Manar, 2092, Tunis, Tunisia
| | - Adel Aschi
- Faculté Des Sciences de Tunis, LR99ES16 Laboratoire Physique de La Matière Molle Et de La Modélisation Électromagnétique, Université de Tunis El Manar, 2092, Tunis, Tunisia.
| | - Houda Bey
- Faculté Des Sciences de Tunis, LR99ES16 Laboratoire Physique de La Matière Molle Et de La Modélisation Électromagnétique, Université de Tunis El Manar, 2092, Tunis, Tunisia
| | - Tahar Othman
- Faculté Des Sciences de Tunis, LR99ES16 Laboratoire Physique de La Matière Molle Et de La Modélisation Électromagnétique, Université de Tunis El Manar, 2092, Tunis, Tunisia
| |
Collapse
|
8
|
Fan Y, Wang Y. Applications of small-angle X-ray scattering/small-angle neutron scattering and cryogenic transmission electron microscopy to understand self-assembly of surfactants. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.02.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
9
|
Kakizawa Y, Miyake M. Creation of New Functions by Combination of Surfactant and Polymer - Complex Coacervation with Oppositely Charged Polymer and Surfactant for Shampoo and Body Wash. J Oleo Sci 2019; 68:525-539. [PMID: 31092801 DOI: 10.5650/jos.ess19081] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The combination of polymers and surfactants is an important means to create various functions in recent detergents and personal care products. In particular, detergents mixing oppositely charged anionic surfactants and cationic polymers induce coacervation by the dilution of the washing and rinsing process, and the complexes effectively adsorb onto surfaces and can change their characteristics. The driving force of the coacervation is electrostatic interaction between the anionic groups of the surfactant and the cationic groups of the polymer. Normally, the coacervation is controlled by selecting the molecular structure or the amount of polymer and surfactant. In shampoo and body wash compositions, we studied the complex precipitation (CP) regions and the morphology and rheological properties of precipitated complexes by focusing on the number of ionic groups in the anionic surfactants and cationic polymers, the mixed electrolyte and the ionic strength as a whole. This clarified the factors related to complex functions. For coacervation in shampoo based on alkyl ethoxylate sulfate (AES), the degree of cationization of the cationic cellulose (CC) and coexisting electrolyte greatly contributed to these functions. In a combination of moderately cationically charged CC and AES mixed amphoteric surfactant, the precipitated complexes became a loose mesh-like morphology, which was also formed when the charge shielding effect was enhanced by adding electrolyte. The precipitated complexes with a looser mesh-like morphology gave a smooth texture to the hair surface during rinsing.On the other hand, for coacervation in body wash based on fatty acid salt, the complexes were effectively precipitated in a combination with a synthetic polymer, poly diallyldimethylammonium chloride (PDADMAC), which has a higher cationic charge than CC. The precipitated complexes had high adsorbability onto skin and contributed to a moisturizing effect by lowering transepidermal water loss (TEWL).In this review, we introduce the controllable factors of coacervation in shampoo and body wash systems by focusing on the relationship between dilution processes and precipitation behavior.
Collapse
Affiliation(s)
- Yasushi Kakizawa
- Advanced Analytical Science Research Laboratories, LION Corporation
| | - Miyuki Miyake
- Advanced Analytical Science Research Laboratories, LION Corporation
| |
Collapse
|
10
|
Sadadi H, Imani M, Atai M, Wolf BA, Seiffert S. Concentration-dependent switch between chain association and dissociation of oppositely charged weak polyelectrolytes in solution. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.03.065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
11
|
Zhao M, Wang C, Jiang H, Dawadi MB, Vogt BD, Modarelli DA, Zacharia NS. Polyelectrolyte-micelle coacervates: intrapolymer-dominant vs. interpolymer-dominant association, solute uptake and rheological properties. SOFT MATTER 2019; 15:3043-3054. [PMID: 30901008 DOI: 10.1039/c8sm02229a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The effects of polyelectrolyte charge density, polyelectrolyte-to-surfactant ratio, and micelle species on coacervation were studied by turbidity, dynamic light scattering, and zeta potential measurements to examine the coacervation of the weak polyelectrolyte branched polyethylenimine (BPEI) and oppositely charged sodium dodecyl sulfate (SDS) micelles as well as BPEI and mixed micelles composed of SDS and poly(ethylene glycol) 4-nonylphenyl 3-sulfopropyl ether potassium salt (PENS). The results of dynamic light scattering and zeta potential measurements are discussed in terms of pH and BPEI-to-surfactant ratio. An intrapolymer-dominant to interpolymer-dominant association model for the BPEI-micelle coacervates was proposed based on the variation of size and zeta potential of coacervate particles by their BPEI-to-surfactant ratio. The partition coefficient of solutes into BPEI-micelle coacervates was determined using UV-vis measurements as a function of pH, BPEI-to-surfactant ratio, and mixed micelle composition. Both the hydrophobicity of solutes and micelles, as well as the association mode of coacervates, impact the solute uptake efficiency. Dynamic rheological measurements on the coacervates suggest that the rheological properties of the complex coacervates are impacted by the association mode of the coacervates as well as the charge density on BPEI chains during coacervation.
Collapse
Affiliation(s)
- Mengmeng Zhao
- Department of Polymer Engineering, University of Akron, 250 S. Forge St, Akron, OH 44325, USA.
| | | | | | | | | | | | | |
Collapse
|
12
|
Warnakulasuriya SN, Nickerson MT. Review on plant protein-polysaccharide complex coacervation, and the functionality and applicability of formed complexes. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2018; 98:5559-5571. [PMID: 29951999 DOI: 10.1002/jsfa.9228] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 04/27/2018] [Accepted: 06/24/2018] [Indexed: 06/08/2023]
Abstract
Controlling the interactions between plant proteins and polysaccharides can lead to the development of novel electrostatic complexed structures that can give unique functionality. This in turn can broaden the diversity of applications that they may be suitable for. Overwhelmingly in the literature, work and reviews relating to coacervation have involved the use of animal proteins. However, with the increasing demand for plant-based protein alternatives by industry and consumers, a greater understanding of how they interact with polysaccharides is essential to control structure, functionality and applicability. This review discusses the factors governing the nature of protein-polysaccharide interactions, their functional attributes and industrial applications, with special attention given to plant proteins. © 2018 Society of Chemical Industry.
Collapse
Affiliation(s)
| | - Michael T Nickerson
- Department of Food and Bioproduct Sciences, University of Saskatchewan, Saskatoon, Canada
| |
Collapse
|
13
|
Liu J, Shim YY, Tse TJ, Wang Y, Reaney MJ. Flaxseed gum a versatile natural hydrocolloid for food and non-food applications. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2018.01.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
14
|
Effect of small molecules on the phase behavior and coacervation of aqueous solutions of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrene sulfonate). J Colloid Interface Sci 2018; 518:216-224. [DOI: 10.1016/j.jcis.2018.02.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 02/07/2018] [Accepted: 02/08/2018] [Indexed: 11/19/2022]
|
15
|
Yuan Y, Li MF, Chen WS, Zeng QZ, Su DX, Tian B, He S. Microencapsulation of shiitake (Lentinula edodes
) essential oil by complex coacervation: formation, rheological property, oxidative stability and odour attenuation effect. Int J Food Sci Technol 2018. [DOI: 10.1111/ijfs.13752] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Yang Yuan
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
- Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety; South China University of Technology; Guangzhou 510640 China
| | - Meng-Fan Li
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
| | - Wan-Shi Chen
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
| | - Qing-Zhu Zeng
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
| | - Dong-Xiao Su
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
| | - Bin Tian
- Department of Agriculture and Life Sciences; Lincoln University; Lincoln 7647 Canterbury New Zealand
| | - Shan He
- School of Chemistry and Chemical Engineering; Guangzhou University; Guangzhou 510006 China
| |
Collapse
|
16
|
Joshi N, Rawat K, Bohidar H. pH and ionic strength induced complex coacervation of Pectin and Gelatin A. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2017.08.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
17
|
Pathak J, Priyadarshini E, Rawat K, Bohidar H. Complex coacervation in charge complementary biopolymers: Electrostatic versus surface patch binding. Adv Colloid Interface Sci 2017; 250:40-53. [PMID: 29128042 DOI: 10.1016/j.cis.2017.10.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 10/10/2017] [Accepted: 10/29/2017] [Indexed: 10/18/2022]
Abstract
In this review, a number of systems are described to demonstrate the effect of polyelectrolyte chain stiffness (persistence length) on the coacervation phenomena, after we briefly review the field. We consider two specific types of complexation/coacervation: in the first type, DNA is used as a fixed substrate binding to flexible polyions such as gelatin A, bovine serum albumin and chitosan (large persistence length polyelectrolyte binding to low persistence length biopolymer), and in the second case, different substrates such as gelatin A, bovine serum albumin, and chitosan were made to bind to a polyion gelatin B (low persistence length substrate binding to comparable persistence length polyion). Polyelectrolyte chain flexibility was found to have remarkable effect on the polyelectrolyte-protein complex coacervation. The competitive interplay of electrostatic versus surface patch binding (SPB) leading to associative interaction followed by complex coacervation between these biopolymers is elucidated. We modelled the SPB interaction in terms of linear combination of attractive and repulsive Coulombic forces with respect to the solution ionic strength. The aforesaid interactions were established via a universal phase diagram, considering the persistence length of polyion as the sole independent variable.
Collapse
|
18
|
Ferreira GA, Loh W. Liquid crystalline nanoparticles formed by oppositely charged surfactant-polyelectrolyte complexes. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.08.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
19
|
Pandey PK, Kaushik P, Rawat K, Aswal VK, Bohidar HB. Solvent hydrophobicity induced complex coacervation of dsDNA and in situ formed zein nanoparticles. SOFT MATTER 2017; 13:6784-6791. [PMID: 28819659 DOI: 10.1039/c7sm01222e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Zein, a predominantly hydrophobic protein, was sustained as a stable dispersion in ethanol-water (80 : 20, % (v/v)) binary solvent at room temperature (25 °C). Addition of aqueous dsDNA solution (1% (w/v)) to the above dispersion prepared with the protein concentration of Czein = 0.01-0.5% (w/v) caused a concomitant change in ethanol content from 14-35% (v/v), which in turn generated zein nanoparticles in situ of size 80-120 nm increasing with water content. The subsequent associative interaction between DNA (polyanion; 2000 bps) and the positively charged zein nanoparticles, (at pH = 4) was driven by Coulombic forces, and by the solvent hydrophobicity due to the ethanol content of the binary solvent. Experimentally, two interesting regions of interaction were observed from turbidity, zeta potential, particle sizing, and viscosity data: (i) for Czein < 0.2% (w/v), zein nanoparticles of size 80 nm bind to dsDNA (primary complex) causing its condensation (apparent hydrodynamic size decreased from ≈2100 to 560 nm), and (ii) for 0.2% < Czein < 0.5% (w/v) larger nanoparticles (>80 nm) were selectively bound to primary complexes to form partially charge neutralized interpolymer soluble complexes (secondary complexes), followed by complex coacervation. During this process, there was depletion of water in the vicinity of the nucleic acid, which was replaced by hydration provided by the ethanol-water binary solvent. Equilibrium coacervate samples were probed for their microstructure by small angle neutron scattering, and for their viscoelastic properties by rheology. The interplay of solvent hydrophobicity, electrostatic interaction, and zein nanoparticle size dependent charge neutralization had a commensurate effect on this hitherto unexplored coacervation phenomenon.
Collapse
Affiliation(s)
- Pankaj Kumar Pandey
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
| | | | | | | | | |
Collapse
|
20
|
Adal E, Sadeghpour A, Connell S, Rappolt M, Ibanoglu E, Sarkar A. Heteroprotein Complex Formation of Bovine Lactoferrin and Pea Protein Isolate: A Multiscale Structural Analysis. Biomacromolecules 2017; 18:625-635. [PMID: 28080032 DOI: 10.1021/acs.biomac.6b01857] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Associative electrostatic interactions between two oppositely charged globular proteins, lactoferrin (LF) and pea protein isolate (PPI), the latter being a mixture of vicilin, legumin, and convicilin, was studied with a specific PPI/LF molar ratio at room temperature. Structural aspects of the electrostatic complexes probed at different length scales were investigated as a function of pH by means of different complementary techniques, namely, with dynamic light scattering, small-angle X-ray scattering (SAXS), turbidity measurements, and atomic force microscopy (AFM). Irrespective of the applied techniques, the results consistently displayed that complexation between LF and PPI did occur. In an optimum narrow range of pH 5.0-5.8, a viscous liquid phase of complex coacervate was obtained upon mild centrifugation of the turbid LF-PPI mixture with a maximum Rh, turbidity and the ζ-potential being close to zero observed at pH 5.4. In particular, the SAXS data demonstrated that the coacervates were densely assembled with a roughly spherical size distribution exhibiting a maximum extension of ∼80 nm at pH 5.4. Equally, AFM image analysis showed size distributions containing most frequent cluster sizes around 40-80 nm with spherical to elliptical shapes (axis aspect ratio ≤ 2) as well as less frequent elongated to chainlike structures. The most frequently observed compact complexes, we identify as mainly leading to LF-PPI coacervation, whereas for the less frequent chain-like aggregates, we hypothesize that additionally PPI-PPI facilitated complexes exist.
Collapse
Affiliation(s)
- Eda Adal
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds , Leeds LS2 9JT, United Kingdom
- Food Engineering Department, Gaziantep University , 27310 Gaziantep, Turkey
| | - Amin Sadeghpour
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds , Leeds LS2 9JT, United Kingdom
| | - Simon Connell
- Molecular and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds , Leeds LS2 9JT, United Kingdom
| | - Michael Rappolt
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds , Leeds LS2 9JT, United Kingdom
| | - Esra Ibanoglu
- Food Engineering Department, Gaziantep University , 27310 Gaziantep, Turkey
| | - Anwesha Sarkar
- Food Colloids and Processing Group, School of Food Science and Nutrition, University of Leeds , Leeds LS2 9JT, United Kingdom
| |
Collapse
|
21
|
Yuan Y, Kong ZY, Sun YE, Zeng QZ, Yang XQ. Complex coacervation of soy protein with chitosan: Constructing antioxidant microcapsule for algal oil delivery. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2016.08.045] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
22
|
Recent progress of the characterization of oppositely charged polymer/surfactant complex in dilution deposition system. Adv Colloid Interface Sci 2017; 239:146-157. [PMID: 27337996 DOI: 10.1016/j.cis.2016.04.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 04/15/2016] [Accepted: 04/27/2016] [Indexed: 10/21/2022]
Abstract
A mixture of oppositely charged polymer and surfactants changes the solubilized state, having a complex precipitation region at the composition of electric neutralization. This complex behavior has been applied to surface modification in the fields of health care and cosmetic products such as conditioning shampoos, as a dilution-deposition system in which the polymer/surfactant mixture at the higher surfactant concentration precipitates the insoluble complex by dilution. A large number of studies over many years have revealed the basic coacervation behavior and physicochemical properties of complexes. However, the mechanism by which a precipitated complex performs surface modification is not well understood. The precipitation region and the morphology of precipitated complex that are changed by molecular structure and additives affect the performance. Hydrophilic groups such as the EO unit in polymers and surfactants, the mixing of nonionic or amphoteric surfactant and nonionic polymer, and the addition of low polar solvent influence the complex precipitation region. Furthermore, the morphology of precipitated complex is formed by crosslinking and aggregating among polymers in the dilution process, and characterizes the performance of products. The polymer chain density in precipitated complex is determined by the charges of both the polymer and surfactant micelle and the conformation of polymer. As a result, the morphology of precipitated complexes is changed from a closely packed film to looser meshes, and/or to small particles, and it is possible for the morphology to control the rheological properties and the amount of adsorbed silicone. In the future, further investigation of the relationships between the morphology and performance is needed.
Collapse
|
23
|
Jho Y, Yoo HY, Lin Y, Han S, Hwang DS. Molecular and structural basis of low interfacial energy of complex coacervates in water. Adv Colloid Interface Sci 2017; 239:61-73. [PMID: 27499328 DOI: 10.1016/j.cis.2016.07.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Revised: 07/12/2016] [Accepted: 07/14/2016] [Indexed: 12/26/2022]
Abstract
Complex coacervate refers to a phase-separated fluid, typically of two oppositely charged polyelectrolytes in solution, representing a complex fluid system that has been shown to be of essential interest to biological systems, as well as for soft materials processing owing to the expectation of superior underwater coating or adhesion properties. The significance and interest in complex coacervate fluids critically rely on its low interfacial tension with respect to water that, in turn, facilitates the wetting of macromolecular or material surfaces under aqueous conditions, provided there is attractive interaction between the polyelectrolyte constituents and the surface. However, the molecular and structural bases of these properties remain unclear. Recent studies propose that the formation of water-filled and bifluidic sponge-like nanostructured network, driven by the tuning of electrostatic interactions between the polyelectrolyte constituents or their complexes may be a common feature of complex coacervate fluids that display low fluid viscosity and low interfacial tension, but more studies are needed to verify the generality of these observations. In this review, we summarize representative studies of interfacial tension and ultrastructures of complex coacervate fluids. We highlight that a consensus property of the complex coacervate fluid is the observation of high or even bulk-like water dynamics within the dense complex coacervate phase that is consistent with a low cohesive energy fluid. Our own studies on this subject are enabled by the application of magnetic resonance relaxometry methods relying on spin labels tethered to polyelectrolyte constituents or added as spin labeled probe molecules that partition into the dense versus the equilibrium coacervate phase, permitting the extraction of information on local polymer dynamics, polymer packing and local water dynamics. We conclude with a snapshot of our current perspective on the molecular and structural bases of the low interfacial tension of complex coacervate fluids.
Collapse
Affiliation(s)
- YongSeok Jho
- Center for Soft and Living Matter, Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea
| | - Hee Young Yoo
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Yanxian Lin
- Biomolecular Science and Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA
| | - Songi Han
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA; Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Dong Soo Hwang
- Division of Integrative Biosciences and Biotechnology, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea; School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
| |
Collapse
|
24
|
Liu Y, Winter HH, Perry SL. Linear viscoelasticity of complex coacervates. Adv Colloid Interface Sci 2017; 239:46-60. [PMID: 27633928 DOI: 10.1016/j.cis.2016.08.010] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 08/31/2016] [Accepted: 08/31/2016] [Indexed: 01/15/2023]
Abstract
Rheology is a powerful method for material characterization that can provide detailed information about the self-assembly, structure, and intermolecular interactions present in a material. Here, we review the use of linear viscoelastic measurements for the rheological characterization of complex coacervate-based materials. Complex coacervation is an electrostatically and entropically-driven associative liquid-liquid phase separation phenomenon that can result in the formation of bulk liquid phases, or the self-assembly of hierarchical, microphase separated materials. We discuss the need to link thermodynamic studies of coacervation phase behavior with characterization of material dynamics, and provide parallel examples of how parameters such as charge stoichiometry, ionic strength, and polymer chain length impact self-assembly and material dynamics. We conclude by highlighting key areas of need in the field, and specifically call for the development of a mechanistic understanding of how molecular-level interactions in complex coacervate-based materials affect both self-assembly and material dynamics.
Collapse
Affiliation(s)
- Yalin Liu
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA
| | - H Henning Winter
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA
| | - Sarah L Perry
- Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA.
| |
Collapse
|
25
|
Blocher WC, Perry SL. Complex coacervate-based materials for biomedicine. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2016; 9. [DOI: 10.1002/wnan.1442] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/10/2016] [Accepted: 10/02/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Whitney C. Blocher
- Department of Chemical Engineering; University of Massachusetts Amherst; Amherst MA USA
| | - Sarah L. Perry
- Department of Chemical Engineering; University of Massachusetts Amherst; Amherst MA USA
| |
Collapse
|
26
|
Miller DR, Das S, Huang KY, Han S, Israelachvili JN, Waite JH. Mussel Coating Protein-Derived Complex Coacervates Mitigate Frictional Surface Damage. ACS Biomater Sci Eng 2015; 1:1121-1128. [PMID: 26618194 PMCID: PMC4642218 DOI: 10.1021/acsbiomaterials.5b00252] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 09/14/2015] [Indexed: 12/01/2022]
Abstract
![]()
The role of friction in the functional
performance of biomaterial
interfaces is widely reckoned to be critical and complicated but poorly
understood. To better understand friction forces, we investigated
the natural adaptation of the holdfast or byssus of mussels that live
in high-energy surf habitats. As the outermost covering of the byssus,
the cuticle deserves particular attention for its adaptations to frictional
wear under shear. In this study, we coacervated one of three variants
of a key cuticular component, mussel foot protein 1, mfp-1 [(1) Mytilus californianus mcfp-1, (2) rmfp-1, and (3) rmfp-1-Dopa],
with hyaluronic acid (HA) and investigated the wear protection capabilities
of these coacervates to surfaces (mica) during shear. Native mcfp-1/HA
coacervates had an intermediate coefficient of friction (μ ∼0.3)
but conferred excellent wear protection to mica with no damage from
applied loads, F⊥, as high as 300
mN (pressure, P, > 2 MPa). Recombinant rmfp-1/HA
coacervates exhibited a comparable coefficient of friction (μ
∼0.3); however, wear protection was significantly inferior
(damage at F⊥ > 60 mN) compared
with that of native protein coacervates. Wear protection of rmfp-1/HA
coacervates increased 5-fold upon addition of the surface adhesive
group 3,4-dihydroxyphenylalanine, (Dopa). We propose a Dopa-dependent
wear protection mechanism to explain the differences in wear protection
between coacervates. Our results reveal a significant untapped potential
for coacervates in applications that require adhesion, lubrication,
and wear protection. These applications include artificial joints,
contact lenses, dental sealants, and hair and skin conditioners.
Collapse
Affiliation(s)
- Dusty Rose Miller
- Biomolecular Science and Engineering Program, University of California , Santa Barbara, California 93106-9611, United States
| | - Saurabh Das
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106-5080, United States
| | - Kuo-Ying Huang
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106-9625, United States
| | - Songi Han
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106-9625, United States
| | - Jacob N Israelachvili
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106-5080, United States
| | - J Herbert Waite
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106-9625, United States
| |
Collapse
|
27
|
Qi W, Xu HN, Zhang L. The aggregation behavior of cellulose micro/nanoparticles in aqueous media. RSC Adv 2015. [DOI: 10.1039/c4ra08844a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cellulose micro/nanoparticles were obtained from cotton microcrystalline cellulose. The effect of ionic strength on the aggregation behavior of the cellulose micro/nanoparticles in aqueous media has been investigated by means of rheo-SALS.
Collapse
Affiliation(s)
- Wenhui Qi
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
| | - Hua-Neng Xu
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
| | - Lianfu Zhang
- State Key Laboratory of Food Science and Technology
- School of Food Science and Technology
- Jiangnan University
- Wuxi
- P. R. China
| |
Collapse
|
28
|
Fegyver E, Mészáros R. Fine-tuning the nonequilibrium behavior of oppositely charged macromolecule/surfactant mixtures via the addition of nonionic amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:15114-15126. [PMID: 25469711 DOI: 10.1021/la503928x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The various commercial applications of oppositely charged polyelectrolytes (P) and ionic surfactants (S) with added nonionic amphiphiles initiated intensive research on the polyion/mixed surfactant interaction. A large group of earlier studies revealed that one of the major effects of the nonionic cosurfactants is the suppression of the associative phase separation of P/S systems. In contrast, recent studies indicated that in the dilute surfactant concentration range the added uncharged amphiphile enhances the precipitation concentration range. In order to rationalize these observations, the mixtures of poly(diallyldimethylammonium chloride) (PDADMAC), sodium dodecyl sulfate (SDS), and dodecyl maltoside (C12G2) are investigated using a variety of experimental methods. It is shown that the nonionic cosurfactant has two distinct and competing impacts on the mixed surfactant binding onto the polyions. The composition dependent variation of the chemical potentials of the amphiphiles determines which of these effects is the dominant one, explaining the seemingly diverse earlier observations and their interpretations. We also demonstrate that the nonionic amphiphile affects considerably the nonequilibrium features of polyion/ionic surfactant complexation. Namely, the presence of the uncharged surfactant can destabilize the colloidal dispersion of P/S nanoparticles formed in the two-phase composition range. However, at the same concentration range highly stable dispersions of polyion/mixed surfactant nanoparticles can be produced through the application of a new two-step solution preparation technique. This method is based on the order of addition effect of the two surfactants which can be utilized in future scientific and industrial applications.
Collapse
Affiliation(s)
- Edit Fegyver
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University , Pázmány Péter Sétány 1/A, Budapest 1117, Hungary
| | | |
Collapse
|
29
|
Complex coacervation of an arabinogalactan-protein extracted from the Meryta sinclarii tree (puka gum) and whey protein isolate. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2014.03.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
30
|
Dardelle G, Erni P. Three-phase interactions and interfacial transport phenomena in coacervate/oil/water systems. Adv Colloid Interface Sci 2014; 206:79-91. [PMID: 24268195 DOI: 10.1016/j.cis.2013.10.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Accepted: 10/01/2013] [Indexed: 11/19/2022]
Abstract
Complex coacervation is an associative liquid/liquid phase separation resulting in the formation of two liquid phases: a polymer-rich coacervate phase and a dilute continuous solvent phase. In the presence of a third liquid phase in the form of disperse oil droplets, the coacervate phase tends to wet the oil/water interface. This affinity has long been known and used for the formation of core/shell capsules. However, while encapsulation by simple or complex coacervation has been used empirically for decades, there is a lack of a thorough understanding of the three-phase wetting phenomena that control the formation of encapsulated, compound droplets and the role of the viscoelasticity of the biopolymers involved. In this contribution, we review and discuss the interplay of wetting phenomena and fluid viscoelasticity in coacervate/oil/water systems from the perspective of colloid chemistry and fluid dynamics, focusing on aspects of rheology, interfacial tension measurements at the coacervate/solvent interface, and on the formation and fragmentation of three-phase compound drops.
Collapse
Affiliation(s)
- Gregory Dardelle
- Firmenich SA, Corporate Research Division, Materials Science Department, 1217 Meyrin, Geneva, Switzerland
| | - Philipp Erni
- Firmenich SA, Corporate Research Division, Materials Science Department, 1217 Meyrin, Geneva, Switzerland.
| |
Collapse
|
31
|
Fegyver E, Mészáros R. The impact of nonionic surfactant additives on the nonequilibrium association between oppositely charged polyelectrolytes and ionic surfactants. SOFT MATTER 2014; 10:1953-1962. [PMID: 24652458 DOI: 10.1039/c3sm52889h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The effect of uncharged surfactant additives on the oppositely charged polyion/ionic surfactant complexation is usually described as a direct equilibrium association between the polyelectrolyte molecules and free mixed micelles analogous to the polyion/colloidal particle interactions. This approach predicts that the binding of the ionic surfactant to the polyelectrolyte molecules can be completely suppressed by increasing the nonionic-to-ionic surfactant ratio. In the present work, it is shown that the addition of nonionic surfactants to poly(diallyldimethylammonium chloride)/sodium dodecyl sulfate mixtures considerably enhances the binding of the anionic surfactant to the polycation in the dilute surfactant concentration regime. The dynamic light scattering, turbidity, electrophoretic mobility and fluorescence spectroscopic measurements are consistent with the synergic binding of the ionic and nonionic surfactants to the polyelectrolyte molecules. The enhanced surfactant binding could be utilized for the preparation of stable colloidal dispersions of novel polyion/mixed surfactant nanoparticles over a wide composition range provided that adequate mixing protocols are used. These results clearly indicate that the nonionic surfactant additives can be successfully used to tune the nonequilibrium association of oppositely charged macromolecules and amphiphiles.
Collapse
Affiliation(s)
- Edit Fegyver
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, 1117 Budapest, Hungary.
| | | |
Collapse
|
32
|
Crawford NC, Williams SKR, Boldridge D, Liberatore MW. Shear-induced structures and thickening in fumed silica slurries. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12915-12923. [PMID: 24063640 DOI: 10.1021/la402631p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Chemical mechanical polishing (CMP) is an essential technology used in the semiconductor industry to polish and planarize a variety of materials for the fabrication of microelectronic devices (e.g., computer chips). During the high shear (~1,000,000 s(-1)) CMP process, it is hypothesized that individual slurry particles are driven together to form large agglomerates (≥0.5 μm), triggering a shear thickening effect. These shear-induced agglomerates are believed to cause defects during polishing. In this study, we examined the shear thickening of a 25 wt % fumed silica slurry with 0.17 M added KCl using in situ small-angle light scattering during rheological characterization (rheo-SALS). The salt-adjusted slurry displays a ~3-fold increase in viscosity at a critical shear rate of 20,000 s(-1) during a stepped shear rate ramp from 100 to 25,000 s(-1). As the shear rate is reduced back to 100 s(-1), the slurry displays irreversible thickening behavior with a final viscosity that is 100-times greater than the initial viscosity. Corresponding rheo-SALS images indicate the formation of micrometer scale structures (2-3 μm) that directly correlate with the discontinuous and irreversible shear thickening behavior of the fumed silica slurry; these micrometer scale structures are 10-times the nominal particle diameter (~0.2 μm). The scattering patterns from the 25 wt % slurry were corroborated through rheo-SALS examination of 27 and 29 wt % slurries (C(KCl) = 0.1 M). All slurries, regardless of ionic strength and solids loading, display scattering patterns that are directly associated with the observed thickening behavior. Scattering was only observable during and after thickening (i.e., no scattering was detected in the absence of thickening). This work serves as the first in situ observation of micrometer scale structures within the fumed silica CMP slurry while under shear.
Collapse
Affiliation(s)
- Nathan C Crawford
- Department of Chemical and Biological Engineering and ‡Department of Chemistry and Geochemistry, Colorado School of Mines , Golden, Colorado 80401, United States
| | | | | | | |
Collapse
|
33
|
|
34
|
Štěpánek M, Hajduová J, Procházka K, Šlouf M, Nebesářová J, Mountrichas G, Mantzaridis C, Pispas S. Association of poly(4-hydroxystyrene)-block-poly(ethylene oxide) in aqueous solutions: block copolymer nanoparticles with intermixed blocks. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:307-13. [PMID: 22107340 DOI: 10.1021/la203946s] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Association behavior of diblock copolymer poly(4-hydroxystyrene)-block-poly(ethylene oxide) (PHOS-PEO) in aqueous solutions and solutions in water/tetrahydrofuran mixtures was studied by static, dynamic, and electrophoretic light scattering, (1)H NMR spectroscopy, transmission electron microscopy, and cryogenic field-emission scanning electron microscopy. It was found that, in alkaline aqueous solutions, PHOS-PEO can form compact spherical nanoparticles whose size depends on the preparation protocol. Instead of a core/shell structure with segregated blocks, the PHOS-PEO nanoparticles have intermixed PHOS and PEO blocks due to hydrogen bond interaction between -OH groups of PHOS and oxygen atoms of PEO and are stabilized electrostatically by a fraction of ionized PHOS units on the surface.
Collapse
Affiliation(s)
- Miroslav Štěpánek
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2, Czech Republic.
| | | | | | | | | | | | | | | |
Collapse
|
35
|
Xu HN. An aqueous anionic/nonionic surfactant two-phase system in the presence of salt. 1. Rheological behavior and microstructure. RSC Adv 2012. [DOI: 10.1039/c2ra20656k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
36
|
Schmitt C, Turgeon SL. Protein/polysaccharide complexes and coacervates in food systems. Adv Colloid Interface Sci 2011; 167:63-70. [PMID: 21056401 DOI: 10.1016/j.cis.2010.10.001] [Citation(s) in RCA: 541] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Accepted: 10/08/2010] [Indexed: 11/29/2022]
Abstract
Since the pioneering work of Bungenberg de Jong and co-workers on gelatin-acacia gum complex coacervation in the 1920-40s, protein/polysaccharide complexes and coacervates have received increasing research interest in order to broaden the possible food applications. This review focuses on the main research streams followed in this field during the last 12 years regarding: i) the parameters influencing the formation of complexes and coacervates in protein-polysaccharide systems; ii) the characterization of the kinetics of phase separation and multi-scale structure of the complexes and coacervates; and iii) the investigation of the functional properties of complexes and coacervates in food applications. This latter section encompasses various technological aspects, namely: the viscosifying and gelling ability, the foaming and emulsifying ability and finally, the stabilization and release of bioactives or sensitive compounds.
Collapse
Affiliation(s)
- Christophe Schmitt
- Department of Food Science and Technology, Nestlé Research Center, Lausanne, Switzerland.
| | | |
Collapse
|
37
|
Kizilay E, Kayitmazer AB, Dubin PL. Complexation and coacervation of polyelectrolytes with oppositely charged colloids. Adv Colloid Interface Sci 2011; 167:24-37. [PMID: 21803318 DOI: 10.1016/j.cis.2011.06.006] [Citation(s) in RCA: 284] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 06/10/2011] [Accepted: 06/19/2011] [Indexed: 10/18/2022]
Abstract
Polyelectrolyte-colloid coacervation could be viewed as a sub-category of complex coacervation, but is unique in (1) retaining the structure and properties of the colloid, and (2) reducing the heterogeneity and configurational complexity of polyelectrolyte-polyelectrolyte (PE-PE) systems. Interest in protein-polyelectrolyte coacervates arises from preservation of biofunctionality; in addition, the geometric and charge isotropy of micelles allows for better comparison with theory, taking into account the central role of colloid charge density. In the context of these two systems, we describe critical conditions for complex formation and for coacervation with regard to colloid and polyelectrolyte charge densities, ionic strength, PE molecular weight (MW), and stoichiometry; and effects of temperature and shear, which are unique to the PE-micelle systems. The coacervation process is discussed in terms of theoretical treatments and models, as supported by experimental findings. We point out how soluble aggregates, subject to various equilibria and disproportionation effects, can self-assemble leading to heterogeneity in macroscopically homogeneous coacervates, on multiple length scales.
Collapse
|
38
|
Kaur S, Weerasekare GM, Stewart RJ. Multiphase adhesive coacervates inspired by the Sandcastle worm. ACS APPLIED MATERIALS & INTERFACES 2011; 3:941-4. [PMID: 21410239 PMCID: PMC3083470 DOI: 10.1021/am200082v] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Water-borne, underwater adhesives were created by complex coacervation of synthetic copolyelectrolytes that mimic the proteins of the natural underwater adhesive of the sandcastle worm. To increase bond strengths, we created a second polymer network within cross-linked coacervate network by entrapping polyethylene glycol diacrylate (PEG-dA) monomers in the coacervate phase. Simultaneous polymerization of PEG-dA and cross-linking of the coacervate network resulted in maximum shear bond strengths of ∼1.2 MPa. Approximately 40% of the entrapped PEG-dA polymerized based on attenuated total reflectance-Fourier transform infrared spectroscopy. The monomer-filled coacervate had complex flow behavior, thickening at low shear rates and then thinning suddenly with a 16-fold drop in viscosity at shear rates near 6 s(-1). The microscale structure of the complex coacervates resembled a three-dimensional porous network of interconnected tubules. The sharp shear thinning behavior is conceptualized as a structural reorganization between the interspersed phases of the complex coacervate. The bond strength and complex fluid behavior of the monomer-filled coacervates have important implications for medical applications of the adhesives.
Collapse
|
39
|
Kizilay E, Maccarrone S, Foun E, Dinsmore AD, Dubin PL. Cluster Formation in Polyelectrolyte−Micelle Complex Coacervation. J Phys Chem B 2011; 115:7256-63. [DOI: 10.1021/jp109788r] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ebru Kizilay
- Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Simona Maccarrone
- Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Elaine Foun
- Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Anthony D. Dinsmore
- Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Paul L. Dubin
- Department of Chemistry and ‡Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| |
Collapse
|
40
|
Yang K, Cheng Y, Feng X, Zhang J, Wu Q, Xu T. Insights into the Interactions between Dendrimers and Multiple Surfactants: 5. Formation of Miscellaneous Mixed Micelles Revealed by a Combination of 1H NMR, Diffusion, and NOE Analysis. J Phys Chem B 2010; 114:7265-73. [DOI: 10.1021/jp1026493] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Kun Yang
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| | - Yiyun Cheng
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| | - Xueyan Feng
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| | - Jiahai Zhang
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| | - Qinglin Wu
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter Chemistry, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, Anhui, 230026, People’s Republic of China, School of Life Sciences, East China Normal University, Shanghai, 200062, People’s Republic of China, and Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230027, People’s Republic of China
| |
Collapse
|