101
|
Randall GC. Electric Field Deformation of Protein-Coated Droplets in Thin Channels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10028-10039. [PMID: 30060664 DOI: 10.1021/acs.langmuir.8b01713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
High-strength droplet interfaces are attractive for many applications, specifically in cases where droplets are channeled through fluidic devices and manipulated by electromagnetic fields. Using models and experiments, we study the deformation of droplets and capsules with protein interfaces in an electric field in thin and wide electrode gaps. Proteins are chosen from candidates expected to display qualitatively different interfacial interactions and strengths: a globular protein (bovine serum albumin), a reversible cross-linking peptide (AFD4), and a hydrophobin (cerato ulmin). Dilute protein additives can lead to over 1 order of magnitude stronger oil-water interfaces than those stabilized by small surfactants. We develop small deformation models to evaluate a protein membrane's interfacial elasticity, notably accounting for the electric field perturbation encountered in a gap and a careful treatment of a generalized elastic interface with both surface tension and interfacial elasticity. Results indicate that globular proteins, which typically have comparable surface tension and interfacial elasticity, can be modeled well by this generalized elastic interface. We further find that when in a gap, droplets and capsules migrate toward one electrode, deform asymmetrically, exhibit polar spreading on the electrode, and predictably stretch more than in the infinite gap scenario at constant field strength.
Collapse
Affiliation(s)
- Greg C Randall
- General Atomics , San Diego , California 92121 , United States
| |
Collapse
|
102
|
Maestro A, Santini E, Guzmán E. Physico-chemical foundations of particle-laden fluid interfaces. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2018; 41:97. [PMID: 30141087 DOI: 10.1140/epje/i2018-11708-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 07/27/2018] [Indexed: 06/08/2023]
Abstract
Particle-laden interfaces are ubiquitous nowadays. The understanding of their properties and structure is essential for solving different problems of technological and industrial relevance; e.g. stabilization of foams, emulsions and thin films. These rely on the response of the interface to mechanical perturbations. The complex mechanical response appearing in particle-laden interfaces requires deepening on the understanding of physico-chemical mechanisms underlying the assembly of particles at interface which plays a central role in the distribution of particles at the interface, and in the complex interfacial dynamics appearing in these systems. Therefore, the study of particle-laden interfaces deserves attention to provide a comprehensive explanation on the complex relaxation mechanisms involved in the stabilization of fluid interfaces.
Collapse
Affiliation(s)
- Armando Maestro
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042, Grenoble, Cedex 9, France
| | - Eva Santini
- Istituto di Chimica della Materia Condensata e di Tecnologia per l'Energia (ICMATE), U.O.S. Genova-Consiglio Nazionale delle Ricerche (CNR), Via De Marini 6, 16149, Genova, Italy
| | - Eduardo Guzmán
- Departamento de Química Física I, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040, Madrid, Spain.
- Instituto Pluridisciplinar, Universidad Complutense de Madrid, Paseo Juan XXIII, 1, 28040, Madrid, Spain.
| |
Collapse
|
103
|
Ivancic W, Wirth CL. Combined effect of oxidative treatment and residual alcohol on the mechanics of a multiwalled carbon nanotube laden interface. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
104
|
Akanno A, Guzmán E, Fernández-Peña L, Llamas S, Ortega F, Rubio RG. Equilibration of a Polycation-Anionic Surfactant Mixture at the Water/Vapor Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7455-7464. [PMID: 29856927 DOI: 10.1021/acs.langmuir.8b01343] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The adsorption of concentrated poly(diallyldimethylammonium chloride) (PDADMAC)-sodium lauryl ether sulfate (SLES) mixtures at the water/vapor interface has been studied by different surface tension techniques and dilational viscoelasticity measurements. This work tries to shed light on the way in which the formation of polyelectrolyte-surfactant complexes in the bulk affects the interfacial properties of mixtures formed by a polycation and an oppositely charged surfactant. The results are discussed in terms of a two-step adsorption-equilibration of PDADMAC-SLES complexes at the interface, with the initial stages involving the diffusion of kinetically trapped aggregates formed in the bulk to the interface followed by the dissociation and spreading of such aggregates at the interface. This latter process becomes the main contribution to the surface tension decrease. This work aids our understanding of the most fundamental basis of the physicochemical behavior of concentrated polyelectrolyte-surfactant mixtures which present complex bulk and interfacial interactions with interest in both basic and applied sciences.
Collapse
Affiliation(s)
- Andrew Akanno
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid , Paseo Juan XXIII, 1 , 28040 Madrid , Spain
| | - Eduardo Guzmán
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid , Paseo Juan XXIII, 1 , 28040 Madrid , Spain
| | - Laura Fernández-Peña
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
| | - Sara Llamas
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
| | - Francisco Ortega
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid , Paseo Juan XXIII, 1 , 28040 Madrid , Spain
| | - Ramón G Rubio
- Departamento de Química Física , Universidad Complutense de Madrid, Ciudad Universitaria s/n , 28040 Madrid , Spain
- Instituto Pluridisciplinar, Universidad Complutense de Madrid , Paseo Juan XXIII, 1 , 28040 Madrid , Spain
| |
Collapse
|
105
|
De Corato M, Garbin V. Capillary interactions between dynamically forced particles adsorbed at a planar interface and on a bubble. JOURNAL OF FLUID MECHANICS 2018; 847:71-92. [PMID: 29880987 PMCID: PMC5986083 DOI: 10.1017/jfm.2018.319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigate the dynamic interfacial deformation induced by micrometric particles exerting a periodic force on a planar interface or on a bubble, and the resulting lateral capillary interactions. Assuming that the deformation of the interface is small, neglecting the effect of viscosity, and assuming point particles, we derive analytical formulas for the dynamic deformation of the interface. For the case of a planar interface the dynamic point force simply generates capillary waves, while for the case of a bubble it excites shape oscillations, with a dominat deformation mode that depends on the bubble radius for a given forcing frequency. We evaluate the lateral capillary force acting between two particles, by superimposing the deformations induced by two point forces. We find that the lateral capillary forces experienced by dynamically forced particles are non monotonic and can be repulsive. The results are applicable to micrometric particles driven by different dynamic forcing mechanisms such as magnetic, electric or acoustic fields.
Collapse
Affiliation(s)
- M. De Corato
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - V. Garbin
- Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| |
Collapse
|
106
|
Forth J, Liu X, Hasnain J, Toor A, Miszta K, Shi S, Geissler PL, Emrick T, Helms BA, Russell TP. Reconfigurable Printed Liquids. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707603. [PMID: 29573293 DOI: 10.1002/adma.201707603] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 01/31/2018] [Indexed: 06/08/2023]
Abstract
Liquids lack the spatial order required for advanced functionality. Interfacial assemblies of colloids, however, can be used to shape liquids into complex, 3D objects, simultaneously forming 2D layers with novel magnetic, plasmonic, or structural properties. Fully exploiting all-liquid systems that are structured by their interfaces would create a new class of biomimetic, reconfigurable, and responsive materials. Here, printed constructs of water in oil are presented. Both form and function are given to the system by the assembly and jamming of nanoparticle surfactants, formed from the interfacial interaction of nanoparticles and amphiphilic polymers that bear complementary functional groups. These yield dissipative constructs that exhibit a compartmentalized response to chemical cues. Potential applications include biphasic reaction vessels, liquid electronics, novel media for the encapsulation of cells and active matter, and dynamic constructs that both alter, and are altered by, their external environment.
Collapse
Affiliation(s)
- Joe Forth
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Xubo Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Jaffar Hasnain
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Anju Toor
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Department of Mechanical Engineering, University of California, Berkeley, CA, 94720, USA
| | - Karol Miszta
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Shaowei Shi
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Phillip L Geissler
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Todd Emrick
- Polymer Science and Engineering Department, Conte Center for Polymer Research, University of Massachusetts, 120 Governors Drive, Amherst, MA, 01003, USA
| | - Brett A Helms
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Thomas P Russell
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing, Beijing University of Chemical Technology, Beijing, 100029, China
- Polymer Science and Engineering Department, Conte Center for Polymer Research, University of Massachusetts, 120 Governors Drive, Amherst, MA, 01003, USA
- WPI - Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
| |
Collapse
|
107
|
Kong D, Megone W, Nguyen KDQ, Di Cio S, Ramstedt M, Gautrot JE. Protein Nanosheet Mechanics Controls Cell Adhesion and Expansion on Low-Viscosity Liquids. NANO LETTERS 2018; 18:1946-1951. [PMID: 29411615 DOI: 10.1021/acs.nanolett.7b05339] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Adherent cell culture typically requires cell spreading at the surface of solid substrates to sustain the formation of stable focal adhesions and assembly of a contractile cytoskeleton. However, a few reports have demonstrated that cell culture is possible on liquid substrates such as silicone and fluorinated oils, even displaying very low viscosities (0.77 cSt). Such behavior is surprising as low viscosity liquids are thought to relax much too fast (<ms) to enable the stabilization of focal adhesions (with lifetimes on the order of minutes to hours). Here we show that cell spreading and proliferation at the surface of low viscosity liquids are enabled by the self-assembly of mechanically strong protein nanosheets at these interfaces. We propose that this phenomenon results from the denaturation of globular proteins, such as albumin, in combination with the coupling of surfactant molecules to the resulting protein nanosheets. We use interfacial rheology and atomic force microscopy indentation to characterize the mechanical properties of protein nanosheets and associated liquid-liquid interfaces. We identify a direct relationship between interfacial mechanics and the association of surfactant molecules with proteins and polymers assembled at liquid-liquid interfaces. In addition, our data indicate that cells primarily sense in-plane mechanical properties of interfaces, rather than relying on surface tension to sustain spreading, as in the spreading of water striders. These findings demonstrate that bulk and nanoscale mechanical properties may be designed independently, to provide structure and regulate cell phenotype, therefore calling for a paradigm shift for the design of biomaterials in regenerative medicine.
Collapse
|
108
|
|
109
|
Xu Q, Style RW, Dufresne ER. Surface elastic constants of a soft solid. SOFT MATTER 2018; 14:916-920. [PMID: 29383365 DOI: 10.1039/c7sm02431b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Solid interfaces have intrinsic elasticity. However, in most experiments, this is obscured by bulk stresses. Through microscopic observations of the contact-line geometry of a partially wetting droplet on an anisotropically stretched substrate, we measure two surface-elastic constants that quantify the linear dependence of the surface stress of a soft polymer gel on its strain. With these two parameters, one can predict surface stresses for general deformations of the material in the linear-elastic limit.
Collapse
Affiliation(s)
- Qin Xu
- Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
| | - Robert W Style
- Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
| | - Eric R Dufresne
- Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
| |
Collapse
|
110
|
Huerre A, Cacho-Nerin F, Poulichet V, Udoh CE, De Corato M, Garbin V. Dynamic Organization of Ligand-Grafted Nanoparticles during Adsorption and Surface Compression at Fluid-Fluid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1020-1028. [PMID: 29211963 PMCID: PMC5812666 DOI: 10.1021/acs.langmuir.7b02867] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 11/06/2017] [Indexed: 05/31/2023]
Abstract
Monolayers of ligand-grafted nanoparticles at fluid interfaces exhibit a complex response to deformation due to an interplay of particle rearrangements within the monolayer, and molecular rearrangements of the ligand brush on the surface of the particles. We use grazing-incidence small-angle X-ray scattering (GISAXS) combined with pendant drop tensiometry to probe in situ the dynamic organization of ligand-grafted nanoparticles upon adsorption at a fluid-fluid interface, and during monolayer compression. Through the simultaneous measurements of interparticle distance, obtained from GISAXS, and of surface pressure, obtained from pendant drop tensiometry, we link the interfacial stress to the monolayer microstructure. The results indicate that, during adsorption, the nanoparticles form rafts that grow while the interparticle distance remains constant. For small-amplitude, slow compression of the monolayer, the evolution of the interparticle distance bears a signature of ligand rearrangements leading to a local decrease in thickness of the ligand brush. For large-amplitude compression, the surface pressure is found to be strongly dependent on the rate of compression. Two-dimensional Brownian dynamics simulations show that the rate-dependent features are not due to jamming of the monolayer, and suggest that they may be due to out-of-plane reorganization of the particles (for instance expulsion or buckling). The corresponding GISAXS patterns are also consistent with out-of-plane reorganization of the nanoparticles.
Collapse
Affiliation(s)
- Axel Huerre
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, United Kingdom
| | - Fernando Cacho-Nerin
- Harwell
Science and Innovation Campus, Diamond Light
Source, Didcot OX11 ODE, United Kingdom
| | - Vincent Poulichet
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, United Kingdom
- Complex
Fluids Group, School of Chemical Engineering, UNSW Sydney, Sydney, NSW 2052, Australia
| | - Christiana E. Udoh
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, United Kingdom
| | - Marco De Corato
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, United Kingdom
| | - Valeria Garbin
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, United Kingdom
| |
Collapse
|
111
|
Thijssen JHJ, Vermant J. Interfacial rheology of model particles at liquid interfaces and its relation to (bicontinuous) Pickering emulsions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:023002. [PMID: 29165321 DOI: 10.1088/1361-648x/aa9c74] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Interface-dominated materials are commonly encountered in both science and technology, and typical examples include foams and emulsions. Conventionally stabilised by surfactants, emulsions can also be stabilised by micron-sized particles. These so-called Pickering-Ramsden (PR) emulsions have received substantial interest, as they are model arrested systems, rather ubiquitous in industry and promising templates for advanced materials. The mechanical properties of the particle-laden liquid-liquid interface, probed via interfacial rheology, have been shown to play an important role in the formation and stability of PR emulsions. However, the morphological processes which control the formation of emulsions and foams in mixing devices, such as deformation, break-up, and coalescence, are complex and diverse, making it difficult to identify the precise role of the interfacial rheological properties. Interestingly, the role of interfacial rheology in the stability of bicontinuous PR emulsions (bijels) has been virtually unexplored, even though the phase separation process which leads to the formation of these systems is relatively simple and the interfacial deformation processes can be better conceptualised. Hence, the aims of this topical review are twofold. First, we review the existing literature on the interfacial rheology of particle-laden liquid interfaces in rheometrical flows, focussing mainly on model latex suspensions consisting of polystyrene particles carrying sulfate groups, which have been most extensively studied to date. The goal of this part of the review is to identify the generic features of the rheology of such systems. Secondly, we will discuss the relevance of these results to the formation and stability of PR emulsions and bijels.
Collapse
Affiliation(s)
- J H J Thijssen
- SUPA School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kindom
| | | |
Collapse
|
112
|
Global strain field mapping of a particle-laden interface using digital image correlation. J Colloid Interface Sci 2018; 509:94-101. [DOI: 10.1016/j.jcis.2017.08.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/24/2017] [Accepted: 08/24/2017] [Indexed: 11/23/2022]
|
113
|
Rendos A, Alsharif N, Kim BL, Brown KA. Elasticity and failure of liquid marbles: influence of particle coating and marble volume. SOFT MATTER 2017; 13:8903-8909. [PMID: 28951907 DOI: 10.1039/c7sm01676j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
When coated with microscale hydrophobic particles, macroscopic liquid droplets can become non-wetting liquid marbles that exhibit an array of fascinating solid-like properties. Specifically, the force required to uniaxially compress liquid marbles depends on their volume, but it is unclear if the particle coating plays a role. In contrast, the failure of marbles upon compression does depend on the particle coating, but the conditions for failure do not appear to change with marble volume. Here, we experimentally study the elastic deformation and failure of liquid marbles and, by applying a doubly truncated oblate spheroid model to quantify their surface area, explore the role of marble volume and particle composition. First, we find that the work required to compress liquid marbles agrees with the product of the core fluid surface tension and the change in the marble surface area, validating that the elastic mechanics of liquid marbles is independent of the particle coating. Next, we study marble failure by measuring their ductility as quantified by the maximum fractional increase in marble surface area prior to rupture. Not only does marble ductility depend on the particle coating, but it also depends on marble volume with smaller marbles being more ductile. This size effect is attributed to an interaction between marble curvature and particle rafts held together by interparticle forces. These results illuminate new avenues to tailor the rupture of liquid marbles for applications spanning smart fluid handling and pollution mitigation.
Collapse
Affiliation(s)
- Abigail Rendos
- Department of Mechanical Engineering, Boston University, Boston, MA 02215, USA.
| | | | | | | |
Collapse
|
114
|
Liu F, Akhmetkhanova N, Pauchard V. A simple numerical solution of diffusional equations for dilatational rheology of complex surfactant mixtures in any geometry. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.05.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
115
|
Manikantan H, Squires TM. Irreversible particle motion in surfactant-laden interfaces due to pressure-dependent surface viscosity. Proc Math Phys Eng Sci 2017; 473:20170346. [PMID: 28989310 DOI: 10.1098/rspa.2017.0346] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 08/24/2017] [Indexed: 11/12/2022] Open
Abstract
The surface shear viscosity of an insoluble surfactant monolayer often depends strongly on its surface pressure. Here, we show that a particle moving within a bounded monolayer breaks the kinematic reversibility of low-Reynolds-number flows. The Lorentz reciprocal theorem allows such irreversibilities to be computed without solving the full nonlinear equations, giving the leading-order contribution of surface pressure-dependent surface viscosity. In particular, we show that a disc translating or rotating near an interfacial boundary experiences a force in the direction perpendicular to that boundary. In unbounded monolayers, coupled modes of motion can also lead to non-intuitive trajectories, which we illustrate using an interfacial analogue of the Magnus effect. This perturbative approach can be extended to more complex geometries, and to two-dimensional suspensions more generally.
Collapse
Affiliation(s)
- Harishankar Manikantan
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93101, USA
| | - Todd M Squires
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93101, USA
| |
Collapse
|
116
|
Lignel S, Salsac AV, Drelich A, Leclerc E, Pezron I. Water-in-oil droplet formation in a flow-focusing microsystem using pressure- and flow rate-driven pumps. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.07.065] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
117
|
Xie K, de Loubens C, Dubreuil F, Gunes DZ, Jaeger M, Léonetti M. Interfacial rheological properties of self-assembling biopolymer microcapsules. SOFT MATTER 2017; 13:6208-6217. [PMID: 28804800 DOI: 10.1039/c7sm01377a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tuning the mechanical properties of microcapsules through a cost-efficient route of fabrication is still a challenge. The traditional method of layer-by-layer assembly of microcapsules allows building a tailored composite multi-layer membrane but is technically complex as it requires numerous steps. The objective of this article is to characterize the interfacial rheological properties of self-assembling biopolymer microcapsules that were obtained in one single facile step. This thorough study provides new insights into the mechanics of these weakly cohesive membranes. Firstly, suspensions of water-in-oil microcapsules were formed in microfluidic junctions by self-assembly of two oppositely charged polyelectrolytes, namely chitosan (water soluble) and phosphatidic fatty acid (oil soluble). In this way, composite membranes of tunable thickness (between 40 and 900 nm measured by AFM) were formed at water/oil interfaces in a single step by changing the composition. Secondly, microcapsules were mechanically characterized by stretching them up to break-up in an extensional flow chamber which extends the relevance and convenience of the hydrodynamic method to weakly cohesive membranes. Finally, we show that the design of microcapsules can be 'engineered' in an extensive way since they present a wealth of interfacial rheological properties in terms of elasticity, plasticity and yield stress whose magnitudes can be controlled by the composition. These behaviors are explained by the variation of the membrane thickness with the physico-chemical parameters of the process.
Collapse
Affiliation(s)
- Kaili Xie
- Aix-Marseille Université, CNRS, Centrale Marseille, M2P2 UMR 7340, 13451, Marseille, France
| | | | | | | | | | | |
Collapse
|
118
|
Xu Q, Jensen KE, Boltyanskiy R, Sarfati R, Style RW, Dufresne ER. Direct measurement of strain-dependent solid surface stress. Nat Commun 2017; 8:555. [PMID: 28916752 PMCID: PMC5601460 DOI: 10.1038/s41467-017-00636-y] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 07/14/2017] [Indexed: 11/09/2022] Open
Abstract
Surface stress, also known as surface tension, is a fundamental material property of any interface. However, measurements of solid surface stress in traditional engineering materials, such as metals and oxides, have proven to be very challenging. Consequently, our understanding relies heavily on untested theories, especially regarding the strain dependence of this property. Here, we take advantage of the high compliance and large elastic deformability of a soft polymer gel to directly measure solid surface stress as a function of strain. As anticipated by theoretical work for metals, we find that the surface stress depends on the strain via a surface modulus. Remarkably, the surface modulus of our soft gels is many times larger than the zero-strain surface tension. This suggests that surface stresses can play a dominant role in solid mechanics at larger length scales than previously anticipated.Solid surface stress is a fundamental property of solid interfaces. Here authors measure the solid surface stress of a gel, and show its dependence on surface strain through a surface modulus.
Collapse
Affiliation(s)
- Qin Xu
- Department of Materials, ETH Zürich, 8093, Zürich, Switzerland.,Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, 06511, USA
| | - Katharine E Jensen
- Department of Materials, ETH Zürich, 8093, Zürich, Switzerland.,Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, 06511, USA
| | - Rostislav Boltyanskiy
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, 06511, USA
| | - Raphaël Sarfati
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, 06511, USA
| | - Robert W Style
- Department of Materials, ETH Zürich, 8093, Zürich, Switzerland. .,Mathematical Institute, University of Oxford, Oxford, OX1 3LB, UK.
| | - Eric R Dufresne
- Department of Materials, ETH Zürich, 8093, Zürich, Switzerland. .,Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, 06511, USA.
| |
Collapse
|
119
|
Pepicelli M, Verwijlen T, Tervoort TA, Vermant J. Characterization and modelling of Langmuir interfaces with finite elasticity. SOFT MATTER 2017; 13:5977-5990. [PMID: 28776048 DOI: 10.1039/c7sm01100h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Interfaces differ from bulk materials in many ways, one particular aspect is that they are compressible. Changing the area per molecule or per particle changes the thermodynamic state variables such as surface pressure. Yet, when compressing to high surface pressures, dense packing of the interfacial species induces phase transitions, with highly structured phases, which can display elastic or strongly viscoelastic behaviour. When these are deformed, in addition to the changes in the surface pressure, extra and deviatoric stresses can be induced. The traditional tool to study the phase behaviour of monolayers is a rectangular Langmuir-Pockels trough, but as both the area and shape of the interface are changed upon compression, the interfacial-strain field in this instrument is mixed with a priori unknown amounts of dilatational and shear deformations, making it difficult to separate the rheological and equilibrium thermodynamic effects. In the present work, the design of a radial trough is described, in which the deformation field is simple, purely dilation or compression. The possibility to now independently measure the compressional properties of different strains and the development of an appropriate finite strain constitutive model for elastic interfaces make it possible to interrogate the underlying constitutive behaviour. This is shown here for a strongly elastic, soft glassy polymer monolayer during its initial compression but is easily generalised to many viscoelastic soft matter interfaces.
Collapse
Affiliation(s)
- Martina Pepicelli
- ETH Zurich, Department of Materials, Vladimir-Prelog-Weg 5, 8093, Zurich, Switzerland.
| | | | | | | |
Collapse
|
120
|
Nagel M, Tervoort TA, Vermant J. From drop-shape analysis to stress-fitting elastometry. Adv Colloid Interface Sci 2017; 247:33-51. [PMID: 28735884 DOI: 10.1016/j.cis.2017.07.008] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/09/2017] [Accepted: 07/09/2017] [Indexed: 11/18/2022]
Abstract
Drop-shape analysis using pendant or sessile drops is a well-established experimental technique for measuring the interfacial or surface tension, and changes thereof. The method relies on deforming a drop by either gravity or buoyancy and fitting the Young-Laplace equation to the drop shape. Alternatively one can prescribe the shape and measure the pressure inside the drop or bubble using pressure tensiometry. However, when an interface with a complex microstructure is present, extra and anisotropic interfacial stresses may develop due to lateral interactions between the surface-active moieties, leading to deviations of the drop shape or even a wrinkling of the interface. To extract surface-material properties of these complex interfaces using drop-shape analysis or pressure tensiometry, the Young-Laplace law needs to be generalized in order to account for the extra and anisotropic stresses at the interface. In the present work, we review the different approaches that have been proposed to date to extract the surface tension as the thermodynamic state variable, as well as other rheological material properties such as the compression and the shear modulus. To evaluate the intrinsic performance of the methods, computer generated drops are subjected to step-area changes and then subjected to analysis using the different methods. Shape-fitting methods, now combined with an adequate constitutive method, do however perform rather poorly in determining the elastic stresses, especially at small area strains. An additional measurement o f the pressure or capillary-pressure tensiometry is required to improve the sensitivity. However, pressure-based methods still require the knowledge of the undeformed reference state, which may be difficult to achieve in practice. Moreover, it is not straightforward to judge from what point onwards one needs to go beyond the Young-Laplace equation. To overcome these limitations, a method based on stress fitting, which uses a local force balance method, is introduced here. One aspect of this new method is the use of the Chebyshev transform to numerically describe the contour shape of the drop interface. For all methods we present a detailed error analysis to evaluate if, and with what precision, surface material parameters can be extracted. Depending on the desired information, different ideal experimental conditions and most suitable methods are discussed, in addition to having a criterion to investigate if extra and anisotropic stresses matter.
Collapse
Affiliation(s)
- Mathias Nagel
- Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich 8093, Switzerland
| | - Theo A Tervoort
- Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich 8093, Switzerland
| | - Jan Vermant
- Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich 8093, Switzerland.
| |
Collapse
|
121
|
Withdrawing a solid from a bath: How much liquid is coated? Adv Colloid Interface Sci 2017; 247:100-114. [PMID: 28236447 DOI: 10.1016/j.cis.2017.01.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 01/31/2017] [Indexed: 11/21/2022]
Abstract
A solid withdrawn from a liquid bath entrains a film. In this review, after recalling the predictions and results for pure Newtonian liquids coated on simple solids, we analyze the deviations to this ideal case exploring successively three potential sources of complexity: the liquid-air interface, the bulk rheological properties of the liquid and the mechanical or chemical properties of the solid. For these different complexities, we show that significant effects on the film thickness are observed experimentally and we summarize the theoretical analysis presented in the literature, which attempt to rationalize these measurements.
Collapse
|
122
|
Lukyanov AV, Pryer T. Hydrodynamics of Moving Contact Lines: Macroscopic versus Microscopic. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8582-8590. [PMID: 28783342 DOI: 10.1021/acs.langmuir.7b02409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The fluid-mechanics community is currently divided in assessing the boundaries of applicability of the macroscopic approach to fluid mechanical problems. Can the dynamics of nanodroplets be described by the same macroscopic equations as are used for macrodroplets? To the greatest degree, this question should be addressed to the moving-contact-line problem. The problem is naturally multiscale, where even using slip boundary conditions results in spurious numerical solutions and transcendental stagnation regions in modeling in the vicinity of the contact line. In this article, it is demonstrated through mutual comparisons between macroscopic modeling and molecular dynamics simulations that a small, albeit natural, change in the boundary conditions is all that is necessary to completely regularize the problem and eliminate these nonphysical effects. The limits of the macroscopic approach applied to the moving-contact-line problem have been tested and validated on the basis of microscopic first-principles molecular dynamics simulations.
Collapse
Affiliation(s)
- Alex V Lukyanov
- School of Mathematical and Physical Sciences, University of Reading , Reading RG6 6AX, U.K
| | - Tristan Pryer
- School of Mathematical and Physical Sciences, University of Reading , Reading RG6 6AX, U.K
| |
Collapse
|
123
|
Bradley LC, Chen WH, Stebe KJ, Lee D. Janus and patchy colloids at fluid interfaces. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2017.05.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
124
|
Dardelle G, Jacquemond M, Erni P. Delivery Systems for Low Molecular Weight Payloads: Core/Shell Capsules with Composite Coacervate/Polyurea Membranes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1606099. [PMID: 28370381 DOI: 10.1002/adma.201606099] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 01/15/2017] [Indexed: 06/07/2023]
Abstract
Composite polyurea/coacervate core/shell capsules are formed by coupling associative biopolymer phase separation with interfacial polymerization. They combine the excellent chemical stability of synthetic polymer barriers with the strong adhesive properties of protein-based complex coacervates, inspired by biological underwater glues. To encapsulate volatile oil droplets, a primary coacervate hydrogel capsule is formed by a protein and weak polyanion and is reinforced with a polyurea membrane synthesized in situ at the interface between the coacervate and the oil core. The polyurea layer provides an excellent permeability barrier against diffusion of small volatile molecules while the coacervate portion of the shell enhances adhesion on the targeted substrate.
Collapse
Affiliation(s)
- Gregory Dardelle
- Firmenich SA, Materials Science Department, Corporate Research Division, 1217, Meyrin 2, Geneva, Switzerland
| | - Marlène Jacquemond
- Firmenich SA, Materials Science Department, Corporate Research Division, 1217, Meyrin 2, Geneva, Switzerland
| | - Philipp Erni
- Firmenich SA, Materials Science Department, Corporate Research Division, 1217, Meyrin 2, Geneva, Switzerland
| |
Collapse
|
125
|
Tajuelo J, Guzmán E, Ortega F, Rubio RG, Rubio MA. Phase Diagram of Fatty Acid Langmuir Monolayers from Rheological Measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4280-4290. [PMID: 28363024 DOI: 10.1021/acs.langmuir.7b00613] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Langmuir monolayers of fatty acids and alcohols are two-dimensional systems with a rich equilibrium phase diagram. We have explored the temperature and surface-pressure-dependent shear response of monolayers formed by fatty acids of different chain lengths and a fatty alcohol. This has been accomplished with an interfacial shear rheometer utilizing magnetic tweezers and equipped with a refined temperature control and acquisition system. Our rheological results have allowed us to draw a phase diagram from the viscoelastic properties of these 2-D systems and show new phenomena that strongly depend on temperature: the existence of a maximum in viscosity at the L2' phase, the behavior of the elastic modulus to the storage modulus ratio at the L2 phase, and the increase or decrease in viscosity at the L2-LS phase transition. In addition, we unambiguously show that the LS phase displays a counterintuitive behavior in which the loss modulus increases with temperature. We demonstrate, through isothermal surface pressure sweeps and isobaric temperature sweeps, that the exponential dependence of the loss modulus on temperature at the LS phase appears for all hydrophobic tail lengths studied and for both acid and alcohol head groups.
Collapse
Affiliation(s)
- J Tajuelo
- Departamento de Física Fundamental, Universidad Nacional de Educación a Distancia , 28040 Madrid, Spain
| | - E Guzmán
- Departamento de Química Física I, Universidad Complutense de Madrid , 28040 Madrid, Spain
| | - F Ortega
- Departamento de Química Física I, Universidad Complutense de Madrid , 28040 Madrid, Spain
- Instituto Pluridisciplinar, Universidad Complutense , 28040 Madrid, Spain
| | - R G Rubio
- Departamento de Química Física I, Universidad Complutense de Madrid , 28040 Madrid, Spain
- Instituto Pluridisciplinar, Universidad Complutense , 28040 Madrid, Spain
| | - M A Rubio
- Departamento de Física Fundamental, Universidad Nacional de Educación a Distancia , 28040 Madrid, Spain
| |
Collapse
|
126
|
Hooghten RV, Blair VE, Vananroye A, Schofield AB, Vermant J, Thijssen JHJ. Interfacial Rheology of Sterically Stabilized Colloids at Liquid Interfaces and Its Effect on the Stability of Pickering Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4107-4118. [PMID: 28414456 DOI: 10.1021/acs.langmuir.6b04365] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Particle-laden interfaces can be used to stabilize a variety of high-interface systems, from foams over emulsions to polymer blends. The relation between the particle interactions, the structure and rheology of the interface, and the stability of the system remains unclear. In the present work, we experimentally investigate how micron-sized, near-hard-sphere-like particles affect the mechanical properties of liquid interfaces. In particular, by comparing dried and undried samples, we investigate the effect of aggregation state on the properties of the particle-laden liquid interface and its relation to the stability of the corresponding Pickering emulsions. Partially aggregated suspensions give rise to a soft-solid-like response under shear, whereas for stable PMMA particulate layers a liquid-like behavior is observed. For interfacial creep-recovery measurements, we present an empirical method to correct for the combined effect of the subphase drag and the compliance of the double-wall ring geometry, which makes a significant contribution to the apparent elasticity of weak interfaces. We further demonstrate that both undried and dried PMMA particles can stabilize emulsions for months, dispelling the notion that particle aggregation, in bulk or at the interface, is required to create stable Pickering emulsions. Our results indicate that shear rheology is a sensitive probe of colloidal interactions but is not necessarily a predictor of the stability of interfaces, e.g., in quiescent Pickering emulsions, as in the latter the response to dilatational deformations can be of prime importance.
Collapse
Affiliation(s)
- Rob Van Hooghten
- Department of Chemical Engineering, KU Leuven , Celestijnenlaan 200F, Leuven B-3001, Belgium
| | - Victoria E Blair
- Department of Materials, ETH Zürich , Vladimir-Prelog-Weg 5, Zürich CH-8093, Switzerland
| | - Anja Vananroye
- Department of Chemical Engineering, KU Leuven , Celestijnenlaan 200F, Leuven B-3001, Belgium
| | - Andrew B Schofield
- SUPA School of Physics & Astronomy, The University of Edinburgh , Edinburgh EH9 3FD, United Kingdom
| | - Jan Vermant
- Department of Materials, ETH Zürich , Vladimir-Prelog-Weg 5, Zürich CH-8093, Switzerland
| | - Job H J Thijssen
- SUPA School of Physics & Astronomy, The University of Edinburgh , Edinburgh EH9 3FD, United Kingdom
| |
Collapse
|
127
|
Zhang Z, Liu Y. Recent progresses of understanding the viscosity of concentrated protein solutions. Curr Opin Chem Eng 2017. [DOI: 10.1016/j.coche.2017.04.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
128
|
Felix M, Romero A, Guerrero A. Viscoelastic properties, microstructure and stability of high-oleic O/W emulsions stabilised by crayfish protein concentrate and xanthan gum. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.10.028] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
129
|
Li C, Simmons JA, Moradiafrapoli M, Marston JO. Direct visualization of particle attachment to a pendant drop. SOFT MATTER 2017; 13:1444-1454. [PMID: 28124711 DOI: 10.1039/c6sm02495e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An experimental investigation is carried out into the attachment of a single particle to a liquid drop. High-speed videography is used to directly visualize the so-called 'snap-in' effect which occurs rapidly over sub-millisecond timescales. Using high-magnification, the evolution of the contact line around the particle is tracked and dynamic features such as the contact angle, wetted radius and force are extracted from these images to help build a fundamental understanding of the process. By examining the wetted length in terms of an arc angle, ϕ, it is shown that the early wetting stage is an inertial-dominated process and best described by a power law relation, i.e. ϕ ∼ (t/τ)α, where τ is an inertial timescale. For the subsequent lift-off stage, the initial particle displacement is matched with that predicted using a simple balance between particle weight and capillary force with reasonable agreement. The lift-off force is shown to be on the order of 1-100 μN, whilst the force of impacting droplets is known to be on the order of 10-1000 mN. This explains the ease in which liquid marbles are formed during impact experiments.
Collapse
Affiliation(s)
- C Li
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - J A Simmons
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - M Moradiafrapoli
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - J O Marston
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| |
Collapse
|
130
|
Sachan AK, Choi SQ, Kim KH, Tang Q, Hwang L, Lee KYC, Squires TM, Zasadzinski JA. Interfacial rheology of coexisting solid and fluid monolayers. SOFT MATTER 2017; 13:1481-1492. [PMID: 28125114 PMCID: PMC5720834 DOI: 10.1039/c6sm02797k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Biologically relevant monolayer and bilayer films often consist of micron-scale high viscosity domains in a continuous low viscosity matrix. Here we show that this morphology can cause the overall monolayer fluidity to vary by orders of magnitude over a limited range of monolayer compositions. Modeling the system as a two-dimensional suspension in analogy with classic three-dimensional suspensions of hard spheres in a liquid solvent explains the rheological data with no adjustable parameters. In monolayers with ordered, highly viscous domains dispersed in a continuous low viscosity matrix, the surface viscosity increases as a power law with the area fraction of viscous domains. Changing the phase of the continuous matrix from a disordered fluid phase to a more ordered, condensed phase dramatically changes the overall monolayer viscosity. Small changes in the domain density and/or continuous matrix composition can alter the monolayer viscosity by orders of magnitude.
Collapse
Affiliation(s)
- A K Sachan
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
| | - S Q Choi
- Departments of Chemical and Biomolecular Engineering and KINC, KAIST, Daejeon, 305-701, Korea
| | - K H Kim
- Departments of Chemical and Biomolecular Engineering and KINC, KAIST, Daejeon, 305-701, Korea
| | - Q Tang
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
| | - L Hwang
- Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - K Y C Lee
- Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, University of Chicago, Chicago, Illinois 60637, USA
| | - T M Squires
- Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA
| | - J A Zasadzinski
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA.
| |
Collapse
|
131
|
Lishchuk SV. Dilatational viscosity of dilute particle-laden fluid interface at different contact angles. Phys Rev E 2017; 94:063111. [PMID: 28085366 DOI: 10.1103/physreve.94.063111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Indexed: 11/07/2022]
Abstract
We consider a solid spherical particle adsorbed at a flat interface between two immiscible fluids and having arbitrary contact angle at the triple contact line. We derive analytically the flow field corresponding to dilatational surface flow in the case of a large ratio of dynamic shear viscosities of two fluids. Considering a dilute assembly of such particles we calculate numerically the dependence on the contact angle of the effective surface dilatational viscosity particle-laden fluid interface. The effective surface dilatational viscosity is proportional to the size and surface concentration of particles and monotonically increases with the increase in protrusion of particles into the fluid with larger shear viscosity.
Collapse
Affiliation(s)
- Sergey V Lishchuk
- Materials and Engineering Research Institute, Sheffield Hallam University, Sheffield, United Kingdom
| |
Collapse
|
132
|
Samudrala N, Nam J, Sarfati R, Style RW, Dufresne ER. Mechanical stability of particle-stabilized droplets under micropipette aspiration. Phys Rev E 2017; 95:012805. [PMID: 28208345 DOI: 10.1103/physreve.95.012805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Indexed: 06/06/2023]
Abstract
We investigate the mechanical behavior of particle-stabilized droplets using micropipette aspiration. We observe that droplets stabilized with amphiphilic dumbbell-shaped particles exhibit a two-stage response to increasing suction pressure. Droplets first drip, then wrinkle and buckle like an elastic shell. While particles have a dramatic impact on the mechanism of failure, the mechanical strength of the droplets is only modestly increased. On the other hand, droplets coated with the molecular surfactant sodium dodecyl sulfate are even weaker than bare droplets. In all cases, the magnitude of the critical pressure for the onset of instabilities is set by the fluid surface tension.
Collapse
Affiliation(s)
| | - Jin Nam
- AMOREPACIFIC Co., Gyeonggi-do, Seoul 446-729, South Korea
| | | | | | | |
Collapse
|
133
|
Watanabe T, Kawai T, Nonomura Y. Effects of Fatty Acid Addition to Oil-in-water Emulsions Stabilized with Sucrose Fatty Acid Ester. J Oleo Sci 2017; 67:307-313. [DOI: 10.5650/jos.ess17097] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Takamasa Watanabe
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
| | - Takahiro Kawai
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
| | - Yoshimune Nonomura
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University
| |
Collapse
|
134
|
Kong D, Nguyen KDQ, Megone W, Peng L, Gautrot JE. The culture of HaCaT cells on liquid substrates is mediated by a mechanically strong liquid–liquid interface. Faraday Discuss 2017; 204:367-381. [DOI: 10.1039/c7fd00091j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The mechanical properties of naturally-derived matrices and biomaterials are thought to play an important role in directing cell adhesion, spreading, motility, proliferation and differentiation. However, recent reports have indicated that cells may respond to local nanoscale physical cues, rather than bulk mechanical properties. We had previously reported that primary keratinocytes and mesenchymal stem cells did not seem to respond to the bulk mechanical properties of poly(dimethyl siloxane) (PDMS) substrates. In this study, we examine the mechanical properties of weakly crosslinked PDMS substrates and observe a liquid-like behaviour, with complete stress relaxation. We then report the observation that HaCaT cells, an epidermal cell line, proliferate readily at the surface of uncrosslinked liquid PDMS, as well as on low viscosity (0.77 cSt) fluorinated oil. These results are surprising, considering current views in the field of mechanotransduction on the importance of bulk mechanical properties, but we find that strong mechanical interfaces, presumably resulting from protein assembly, are formed at liquid–liquid interfaces for which cell adhesion and proliferation are observed. Hence our results suggest that cells sense the nanoscale mechanical properties of liquid–liquid interfaces and that such physical cues are sufficient to sustain the proliferation of adherent cells.
Collapse
Affiliation(s)
- D. Kong
- School of Engineering and Materials Science
- Queen Mary
- University of London
- London
- UK
| | - K. D. Q. Nguyen
- School of Engineering and Materials Science
- Queen Mary
- University of London
- London
- UK
| | - W. Megone
- School of Engineering and Materials Science
- Queen Mary
- University of London
- London
- UK
| | - L. Peng
- School of Engineering and Materials Science
- Queen Mary
- University of London
- London
- UK
| | - J. E. Gautrot
- School of Engineering and Materials Science
- Queen Mary
- University of London
- London
- UK
| |
Collapse
|
135
|
Poulichet V, Huerre A, Garbin V. Shape oscillations of particle-coated bubbles and directional particle expulsion. SOFT MATTER 2016; 13:125-133. [PMID: 27714376 PMCID: PMC5304335 DOI: 10.1039/c6sm01603k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Bubbles stabilised by colloidal particles can find applications in advanced materials, catalysis and drug delivery. For applications in controlled release, it is desirable to remove the particles from the interface in a programmable fashion. We have previously shown that ultrasound waves excite volumetric oscillations of particle-coated bubbles, resulting in precisely timed particle expulsion due to interface compression on a ultrafast timescale [Poulichet et al., Proc. Natl. Acad. Sci. U. S. A., 2015, 112, 5932]. We also observed shape oscillations, which were found to drive directional particle expulsion from the antinodes of the non-spherical deformation. In this paper we investigate the mechanisms leading to directional particle expulsion during shape oscillations of particle-coated bubbles driven by ultrasound at 40 kHz. We perform high-speed visualisation of the interface shape and of the particle distribution during ultrafast deformation at a rate of up to 104 s-1. The mode of shape oscillations is found to not depend on the bubble size, in contrast with what has been reported for uncoated bubbles. A decomposition of the non-spherical shape in spatial Fourier modes reveals that the interplay of different modes determines the locations of particle expulsion. The n-fold symmetry of the dominant mode does not always lead to desorption from all 2n antinodes, but only those where there is favourable alignment with the sub-dominant modes. Desorption from the antinodes of the shape oscillations is due to different, concurrent mechanisms. The radial acceleration of the interface at the antinodes can be up to 105-106 ms-2, hence there is a contribution from the inertia of the particles localised at the antinodes. In addition, we found that particles migrate to the antinodes of the shape oscillation, thereby enhancing the contribution from the surface pressure in the monolayer.
Collapse
Affiliation(s)
- Vincent Poulichet
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
| | - Axel Huerre
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
| | - Valeria Garbin
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
| |
Collapse
|
136
|
Transition from glass- to gel-like states in clay at a liquid interface. Sci Rep 2016; 6:37239. [PMID: 27883031 PMCID: PMC5121648 DOI: 10.1038/srep37239] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 10/18/2016] [Indexed: 11/08/2022] Open
Abstract
Colloidal clay in water suspensions are known to exhibit a multitude of bulk phases depending on initial colloidal concentration and ionic strength, and examples of this include repulsive Wigner colloidal glasses at low ionic strength and attractive gels at higher ionic strength due to screened electrostatic forces by the electrolyte. From confocal Raman microscopy combined with elasticity measurements, we infer that clay trapped at quasi two-dimensional interfaces between oil and water also exhibit confined glass-like or gel-like states. The results can be important for the preparation of particles stabilized colloidal emulsions or colloidal capsules, and a better understanding of this phenomenon may lead to new emulsion or encapsulation technologies.
Collapse
|
137
|
Joshi D, Bargteil D, Caciagli A, Burelbach J, Xing Z, Nunes AS, Pinto DEP, Araújo NAM, Brujic J, Eiser E. Kinetic control of the coverage of oil droplets by DNA-functionalized colloids. SCIENCE ADVANCES 2016; 2:e1600881. [PMID: 27532053 PMCID: PMC4975550 DOI: 10.1126/sciadv.1600881] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 07/06/2016] [Indexed: 05/04/2023]
Abstract
We report a study of reversible adsorption of DNA-coated colloids on complementary functionalized oil droplets. We show that it is possible to control the surface coverage of oil droplets using colloidal particles by exploiting the fact that, during slow adsorption, compositional arrest takes place well before structural arrest occurs. As a consequence, we can prepare colloid-coated oil droplets with a "frozen" degree of loading but with fully ergodic colloidal dynamics on the droplets. We illustrate the equilibrium nature of the adsorbed colloidal phase by exploring the quasi-two-dimensional phase behavior of the adsorbed colloids under the influence of depletion interactions and present simulations of a simple model that illustrates the nature of the compositional arrest and the structural ergodicity.
Collapse
Affiliation(s)
- Darshana Joshi
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - Dylan Bargteil
- Center for Soft Matter Research and Department of Physics, New York University, New York, NY 10003, USA
| | - Alessio Caciagli
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - Jerome Burelbach
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - Zhongyang Xing
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
| | - André S. Nunes
- Departamento de Física, Faculdade de Ciências, and Centro de Física Teórica e Computacional, Universidade de Lisboa, Campo Grande, P-1749-016 Lisboa, Portugal
| | - Diogo E. P. Pinto
- Departamento de Física, Faculdade de Ciências, and Centro de Física Teórica e Computacional, Universidade de Lisboa, Campo Grande, P-1749-016 Lisboa, Portugal
| | - Nuno A. M. Araújo
- Departamento de Física, Faculdade de Ciências, and Centro de Física Teórica e Computacional, Universidade de Lisboa, Campo Grande, P-1749-016 Lisboa, Portugal
| | - Jasna Brujic
- Center for Soft Matter Research and Department of Physics, New York University, New York, NY 10003, USA
| | - Erika Eiser
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
- Corresponding author.
| |
Collapse
|
138
|
Cappelli S, de Jong AM, Baudry J, Prins MWJ. Interfacial rheometry of polymer at a water-oil interface by intra-pair magnetophoresis. SOFT MATTER 2016; 12:5551-5562. [PMID: 27253322 DOI: 10.1039/c5sm02917a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We describe an interfacial rheometry technique based on pairs of micrometer-sized magnetic particles at a fluid-fluid interface. The particles are repeatedly attracted and repelled by well-controlled magnetic dipole-dipole forces, so-called interfacial rheometry by intra-pair magnetophoresis (IPM). From the forces (∼pN), displacements (∼μm) and velocities (∼μm s(-1)) of the particles we are able to quantify the interfacial drag coefficient of particles within a few seconds and over very long timescales. The use of local dipole-dipole forces makes the system insensitive to fluid flow and suited for simultaneously recording many particles in parallel over a long period of time. We apply IPM to study the time-dependent adsorption of an oil-soluble amino-modified silicone polymer at a water-oil interface using carboxylated magnetic particles. At low polymer concentration the carboxylated particles remain on the water side of the water-oil interface, while at high polymer concentrations the particles transit into the oil phase. Both conditions show a drag coefficient that does not depend on time. However, at intermediate polymer concentrations data show an increase of the interfacial drag coefficient as a function of time, with an increase over more than three orders of magnitude (10(-7) to 10(-4) N s m(-1)), pointing to a strong polymer-polymer interaction at the interface. The time-dependence of the interfacial drag appears to be highly sensitive to the polymer concentration and to the ionic strength of the aqueous phase. We foresee that IPM will be a very convenient technique to study fluid-fluid interfaces for a broad range of materials systems.
Collapse
Affiliation(s)
- Stefano Cappelli
- Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands
| | | | | | | |
Collapse
|
139
|
Danov KD, Stanimirova RD, Kralchevsky PA, Marinova KG, Stoyanov SD, Blijdenstein TB, Cox AR, Pelan EG. Adhesion of bubbles and drops to solid surfaces, and anisotropic surface tensions studied by capillary meniscus dynamometry. Adv Colloid Interface Sci 2016; 233:223-239. [PMID: 26143156 DOI: 10.1016/j.cis.2015.06.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2015] [Revised: 06/11/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
Abstract
Here, we review the principle and applications of two recently developed methods: the capillary meniscus dynamometry (CMD) for measuring the surface tension of bubbles/drops, and the capillary bridge dynamometry (CBD) for quantifying the bubble/drop adhesion to solid surfaces. Both methods are based on a new data analysis protocol, which allows one to decouple the two components of non-isotropic surface tension. For an axisymmetric non-fluid interface (e.g. bubble or drop covered by a protein adsorption layer with shear elasticity), the CMD determines the two different components of the anisotropic surface tension, σs and σφ, which are acting along the "meridians" and "parallels", and vary throughout the interface. The method uses data for the instantaneous bubble (drop) profile and capillary pressure, but the procedure for data processing is essentially different from that of the conventional drop shape analysis (DSA) method. In the case of bubble or drop pressed against a substrate, which forms a capillary bridge, the CBD method allows one to determine also the capillary-bridge force for both isotropic (fluid) and anisotropic (solidified) adsorption layers. The experiments on bubble (drop) detachment from the substrate show the existence of a maximal pulling force, Fmax, that can be resisted by an adherent fluid particle. Fmax can be used to quantify the strength of adhesion of bubbles and drops to solid surfaces. Its value is determined by a competition of attractive transversal tension and repulsive disjoining pressure forces. The greatest Fmax values have been measured for bubbles adherent to glass substrates in pea-protein solutions. The bubble/wall adhesion is lower in solutions containing the protein HFBII hydrophobin, which could be explained with the effect of sandwiched protein aggregates. The applicability of the CBD method to emulsion systems is illustrated by experiments with soybean-oil drops adherent to hydrophilic and hydrophobic substrates in egg yolk solutions. The results reveal how the interfacial rigidity, as well as the bubble/wall and drop/wall adhesion forces, can be quantified and controlled in relation to optimizing the properties of foams and emulsions.
Collapse
|
140
|
Felix M, Romero A, Vermant J, Guerrero A. Interfacial properties of highly soluble crayfish protein derivatives. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.03.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
141
|
Spreading, encapsulation and transition to arrested shapes during drop impact onto hydrophobic powders. J Colloid Interface Sci 2016; 468:10-20. [DOI: 10.1016/j.jcis.2016.01.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 01/11/2016] [Accepted: 01/14/2016] [Indexed: 11/21/2022]
|
142
|
Andreotti B, Bäumchen O, Boulogne F, Daniels KE, Dufresne ER, Perrin H, Salez T, Snoeijer JH, Style RW. Solid capillarity: when and how does surface tension deform soft solids? SOFT MATTER 2016; 12:2993-2996. [PMID: 26936296 DOI: 10.1039/c5sm03140k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Soft solids differ from stiff solids in an important way: their surface stresses can drive large deformations. Based on a topical workshop held in the Lorentz Center in Leiden, this Opinion highlights some recent advances in the growing field of solid capillarity and poses key questions for its advancement.
Collapse
Affiliation(s)
- Bruno Andreotti
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI-CNRS, Université Paris-Diderot, 10 rue Vauquelin, 75005, Paris, France
| | - Oliver Bäumchen
- Max Planck Institute for Dynamics and Self-Organization (MPIDS), D-37077 Göttingen, Germany
| | - François Boulogne
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
| | - Karen E Daniels
- Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
| | - Eric R Dufresne
- School of Engineering and Applied Sciences, Yale University, New Haven, CT 06520, USA and Department of Materials, ETH Zürich, CH-8093 Zurich, Switzerland.
| | - Hugo Perrin
- Physique et Mécanique des Milieux Hétérogènes, UMR 7636 ESPCI-CNRS, Université Paris-Diderot, 10 rue Vauquelin, 75005, Paris, France
| | - Thomas Salez
- PCT Lab, UMR CNRS 7083 Gulliver, ESPCI ParisTech, PSL Research University, 75005 Paris, France
| | - Jacco H Snoeijer
- Physics of Fluids Group, Faculty of Science and Technology, and Burgers Center for Fluid Dynamics, University of Twente, 7500AE Enschede, The Netherlands and Mesoscopic Transport Phenomena, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands
| | - Robert W Style
- Mathematical Institute, University of Oxford, Oxford, OX1 3LB, UK
| |
Collapse
|
143
|
Buttinoni I, Zell ZA, Squires TM, Isa L. Colloidal binary mixtures at fluid-fluid interfaces under steady shear: structural, dynamical and mechanical response. SOFT MATTER 2015; 11:8313-21. [PMID: 26347409 PMCID: PMC4618164 DOI: 10.1039/c5sm01693b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We experimentally study the link between structure, dynamics and mechanical response of two-dimensional (2D) binary mixtures of colloidal microparticles spread at water/oil interfaces. The particles are driven into steady shear by a microdisk forced to rotate at a controlled angular velocity. The flow causes particles to layer into alternating concentric rings of small and big colloids. The formation of such layers is linked to the local, position-dependent shear rate, which triggers two distinct dynamical regimes: particles either move continuously ("Flowing") close to the microdisk, or exhibit intermittent "Hopping" between local energy minima farther away. The shear-rate-dependent surface viscosity of the monolayers can be extracted from a local interfacial stress balance, giving "macroscopic" flow curves whose behavior corresponds to the distinct microscopic regimes of particle motion. Hopping regions reveal a higher resistance to flow compared to the flowing regions, where spatial organization into layers reduces dissipation.
Collapse
Affiliation(s)
- Ivo Buttinoni
- Laboratory for Interfaces, Soft matter and Assembly, Department of Materials, ETH Zurich, Switzerland.
| | - Zachary A Zell
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106-5080, USA
| | - Todd M Squires
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106-5080, USA
| | - Lucio Isa
- Laboratory for Interfaces, Soft matter and Assembly, Department of Materials, ETH Zurich, Switzerland.
| |
Collapse
|
144
|
Hollenbeck EC, Fong JCN, Lim JY, Yildiz FH, Fuller GG, Cegelski L. Molecular determinants of mechanical properties of V. cholerae biofilms at the air-liquid interface. Biophys J 2015; 107:2245-52. [PMID: 25418293 DOI: 10.1016/j.bpj.2014.10.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 09/23/2014] [Accepted: 10/01/2014] [Indexed: 12/13/2022] Open
Abstract
Biofilm formation increases both the survival and infectivity of Vibrio cholerae, the causative agent of cholera. V. cholerae is capable of forming biofilms on solid surfaces and at the air-liquid interface, termed pellicles. Known components of the extracellular matrix include the matrix proteins Bap1, RbmA, and RbmC, an exopolysaccharide termed Vibrio polysaccharide, and DNA. In this work, we examined a rugose strain of V. cholerae and its mutants unable to produce matrix proteins by interfacial rheology to compare the evolution of pellicle elasticity in real time to understand the molecular basis of matrix protein contributions to pellicle integrity and elasticity. Together with electron micrographs, visual inspection, and contact angle measurements of the pellicles, we defined distinct contributions of the matrix proteins to pellicle morphology, microscale architecture, and mechanical properties. Furthermore, we discovered that Bap1 is uniquely required for the maintenance of the mechanical strength of the pellicle over time and contributes to the hydrophobicity of the pellicle. Thus, Bap1 presents an important matrix component to target in the prevention and dispersal of V. cholerae biofilms.
Collapse
Affiliation(s)
- Emily C Hollenbeck
- Department of Chemical Engineering, Stanford University, Stanford, California
| | - Jiunn C N Fong
- Department of Microbiology and Environmental Toxicology, UC Santa Cruz, Santa Cruz, California
| | - Ji Youn Lim
- Department of Chemistry, Stanford University, Stanford, California
| | - Fitnat H Yildiz
- Department of Microbiology and Environmental Toxicology, UC Santa Cruz, Santa Cruz, California
| | - Gerald G Fuller
- Department of Chemical Engineering, Stanford University, Stanford, California
| | - Lynette Cegelski
- Department of Chemistry, Stanford University, Stanford, California.
| |
Collapse
|
145
|
Noskov BA, Bykov AG. Dilational surface rheology of polymer solutions. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4518] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
146
|
Capillary meniscus dynamometry – Method for determining the surface tension of drops and bubbles with isotropic and anisotropic surface stress distributions. J Colloid Interface Sci 2015; 440:168-78. [DOI: 10.1016/j.jcis.2014.10.067] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 10/24/2014] [Accepted: 10/25/2014] [Indexed: 11/18/2022]
|
147
|
|
148
|
Maas M, Hess U, Rezwan K. The contribution of rheology for designing hydroxyapatite biomaterials. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.09.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
149
|
Bollhorst T, Shahabi S, Wörz K, Petters C, Dringen R, Maas M, Rezwan K. Bifunctional Submicron Colloidosomes Coassembled from Fluorescent and Superparamagnetic Nanoparticles. Angew Chem Int Ed Engl 2014; 54:118-23. [DOI: 10.1002/anie.201408515] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 10/06/2014] [Indexed: 01/29/2023]
Affiliation(s)
- Tobias Bollhorst
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Shakiba Shahabi
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Katharina Wörz
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Charlotte Petters
- Centre for Biomolecular Interactions Bremen and Center for Environmental Research and Sustainable Technology, University of Bremen, Leobener Strasse, Bremen (Germany)
| | - Ralf Dringen
- Centre for Biomolecular Interactions Bremen and Center for Environmental Research and Sustainable Technology, University of Bremen, Leobener Strasse, Bremen (Germany)
| | - Michael Maas
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Kurosch Rezwan
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| |
Collapse
|
150
|
Bollhorst T, Shahabi S, Wörz K, Petters C, Dringen R, Maas M, Rezwan K. Bifunctional Submicron Colloidosomes Coassembled from Fluorescent and Superparamagnetic Nanoparticles. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408515] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Tobias Bollhorst
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Shakiba Shahabi
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Katharina Wörz
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Charlotte Petters
- Centre for Biomolecular Interactions Bremen and Center for Environmental Research and Sustainable Technology, University of Bremen, Leobener Strasse, Bremen (Germany)
| | - Ralf Dringen
- Centre for Biomolecular Interactions Bremen and Center for Environmental Research and Sustainable Technology, University of Bremen, Leobener Strasse, Bremen (Germany)
| | - Michael Maas
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| | - Kurosch Rezwan
- Department of Production Engineering, Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, Bremen (Germany)
| |
Collapse
|