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Vázquez-Rodriguez O, Hernández-Contreras M. Faraday waves on a nematic liquid crystal, and its coupling with Marangoni convection about the thermal phase transition. Phys Rev E 2023; 108:054703. [PMID: 38115489 DOI: 10.1103/physreve.108.054703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 10/17/2023] [Indexed: 12/21/2023]
Abstract
Using a linear hydrodynamic theory, we demonstrate that Faraday waves occur in liquid crystalline fluids. The use of already experimentally known material parameters of a N-(4-methoxybenzylidene)-4-butylaniline liquid crystal allows us to confirm and realize the predictions of this theory. It provides the critical wave number and necessary driving acceleration at instability wave onset. Additionally, these observables experience an abrupt change originated by Marangoni convection due to the temperature gradient at the isotropic-nematic phase transition temperature. Correspondingly, the Marangoni number versus temperature also shows a sharp change in the transition temperature.
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Affiliation(s)
- O Vázquez-Rodriguez
- Facultad de Ciencias en Física y Matemáticas Universidad Autónoma de Chiapas, 29050 Tuxtla Gutierrez, Chiapas, México
| | - M Hernández-Contreras
- Departamento de Física Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional Apartado Postal 14-740, 07360 México DF, México
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2
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Coupling Vortical Bulk Flows to the Air–Water Interface: From Putting Oil on Troubled Waters to Surfactants on Protein Solutions. FLUIDS 2021. [DOI: 10.3390/fluids6060198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The air–water interface in flowing systems remains a challenge to model, even in cases where the interface is essentially flat. This is because even though each side is governed by the Navier–Stokes equations, the stress balance which provides the boundary conditions for the equations involves properties associated with surfactants that are inevitably present at the air–water interface. Aside from challenges in measuring interfacial properties, either intrinsic or flow-dependent, the two-way coupling of bulk and interfacial flows is non-trivial, even for very simple flow geometries. Here, we present an overview of the physics associated with surfactant monolayers of flowing liquid and describe how the monolayer affects the bulk flow and how the monolayer is transported and deformed by the bulk flow. The emphasis is primarily on cylindrical flow geometries, and both Newtonian and non-Newtonian interfacial responses are considered. We consider interfacial flows that are solenoidal as well as those where the surface velocity is not divergence free.
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3
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Langevin D. Light scattering by liquid surfaces, new developments. Adv Colloid Interface Sci 2021; 289:102368. [PMID: 33561568 DOI: 10.1016/j.cis.2021.102368] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 11/25/2022]
Abstract
The surface light scattering technique is presented, highlighting recent technical improvements and describing studies of various types of surfaces. The technique is non-invasive, but delicate to handle and no commercial instruments are available yet. The technique gives however interesting information difficult to obtain otherwise, for instance on out-of-equilibrium surfaces, surfaces of very low tension, or systems close to solidification. Many studies were performed with monolayers of surface-active molecules at the surface of water. In this case, surface viscoelastic parameters can be determined at high frequencies (10 kHz- 1 MHz), complementing usefully the data obtained at lower frequencies with other techniques. As with these other techniques, inconsistencies such as negative surface viscosities are sometimes reported. The origin of these anomalies is not yet fully clarified. The problem deserves further work, in order to achieve a satisfactory description of the motion of surfactant or polymer-laden surfaces.
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4
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Cuenca VE, Ferna Ndez Leyes M, Falcone RDO, Correa NM, Langevin D, Ritacco HN. Interfacial Dynamics and Its Relations with ?Negative? Surface Viscosities Measured at Water?Air Interfaces Covered with a Cationic Surfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8333-8343. [PMID: 31124690 DOI: 10.1021/acs.langmuir.9b00534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We studied the dynamics of a cationic surfactant monolayer, Gemini 12-2-12, at the air?water interface for surfactant aqueous solutions at concentrations below the critical micelle concentration. We present surface rheology experiments performed in a Langmuir trough by the oscillatory barrier technique. From these, we found negative surface viscosities at certain frequencies. We demonstrate that this unphysical result is a consequence of an unconsidered surfactant dynamics within the interfacial region. By surface pressure relaxation experiments, after a sudden modification of the interfacial area and by dynamic surface tension and surface potential measurements, several relaxation phenomena and relaxation times were identified. We found that surfactant adsorption and desorption processes are asymmetric: the characteristic times and the number of processes involved in the mechanisms of adsorption and desorption are different. This asymmetry invalidates the usual data analysis procedure that leads to the negative viscosities. Similar mechanisms could be at the origin of the negative viscosities reported in other systems, a possibility that remains to be explored.
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Affiliation(s)
- Victor E Cuenca
- Instituto de Fi?sica del Sur (IFISUR), Departamento de Fi?sica , Universidad Nacional del Sur (UNS), CONICET , Av. L. N. Alem 1253 , B8000CPB Bahi?a Blanca , Argentina
| | - Marcos Ferna Ndez Leyes
- Instituto de Fi?sica del Sur (IFISUR), Departamento de Fi?sica , Universidad Nacional del Sur (UNS), CONICET , Av. L. N. Alem 1253 , B8000CPB Bahi?a Blanca , Argentina
| | - R Dari O Falcone
- Departamento de Qui?mica , Universidad Nacional del Rio Cuarto , Agencia Postal #3, CP X5804BYA Ri?o Cuarto , Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, UNRC-CONICET) , Universidad Nacional de Ri?o Cuarto , Ruta 36, Km 601 , X5804ZAB Ri?o Cuarto , Co?rdoba , Argentina
| | - N Mariano Correa
- Departamento de Qui?mica , Universidad Nacional del Rio Cuarto , Agencia Postal #3, CP X5804BYA Ri?o Cuarto , Argentina
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, UNRC-CONICET) , Universidad Nacional de Ri?o Cuarto , Ruta 36, Km 601 , X5804ZAB Ri?o Cuarto , Co?rdoba , Argentina
| | - Dominique Langevin
- Laboratoire de Physique des Solides , Universite? Paris Sud , Ba?t. 510, Orsay 91405 , France
| | - Herna N Ritacco
- Instituto de Fi?sica del Sur (IFISUR), Departamento de Fi?sica , Universidad Nacional del Sur (UNS), CONICET , Av. L. N. Alem 1253 , B8000CPB Bahi?a Blanca , Argentina
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5
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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]
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6
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Lotfi M, Karbaschi M, Javadi A, Mucic N, Krägel J, Kovalchuk V, Rubio R, Fainerman V, Miller R. Dynamics of liquid interfaces under various types of external perturbations. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.04.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Affiliation(s)
- Gerald G. Fuller
- Department of Chemical Engineering, Stanford University, Stanford, California 94305-5025;
| | - Jan Vermant
- Department of Chemical Engineering, University of Leuven, Leuven B-3001, Belgium;
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8
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Prasad S, Jiang Z, Sprung M, Sinha SK, Dhinojwala A. Effect of surface freezing on meniscus relaxation in side chain comb polymers. PHYSICAL REVIEW LETTERS 2010; 104:137801. [PMID: 20481915 DOI: 10.1103/physrevlett.104.137801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Indexed: 05/29/2023]
Abstract
We have observed a sharp slowing down of the relaxation of the liquid meniscus for poly(n-alkyl acrylate) at temperatures where there are no abrupt changes in bulk viscosity or surface tension. This slowing down is due to the formation of a surface-ordered monolayer above the bulk melting temperatures. X-ray photon correlation spectroscopy measurements reveal that the surface capillary fluctuations are also significantly slower due to the formation of the ordered monolayer for film thicknesses comparable to that of the precursor films. The slowing down of the precursor film dynamics is responsible for slower meniscus relaxation below the surface ordering transition temperature.
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Affiliation(s)
- Shishir Prasad
- Department of Polymer Science, The University of Akron, Akron, Ohio 44325, USA
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9
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Ohmasa Y, Hoshino T, Osada R, Yao M. Surface waves at the liquid–vapor interface of ionic liquid [bmim][TFSI]. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.02.077] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Díez-Pascual AM, Monroy F, Ortega F, Rubio RG, Miller R, Noskov BA. Adsorption of water-soluble polymers with surfactant character. Dilational viscoelasticity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:3802-8. [PMID: 17311431 DOI: 10.1021/la062936c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A brief summary of dilational surface viscoelatic properties of spread and adsorbed surfactant polymer films at the air-water interface is reported. The viscoelastic moduli have been measured as a function of frequency and surface pressure. The combination of several techniques, oscillating drop and barrier experiments and electrocapillary waves (ECW), has allowed us to investigate a broad frequency range. The dynamic elasticity epsilon shows a slight change with frequency and a noticeable pressure dependence for both kinds of monolayers. In the spread films, elasticity increases steeply with surface pressure, and reaches a constant value before the polymer begins to dissolve into the bulk. On the other hand, the adsorbed films exhibit a pronounced elasticity maximum, followed by a considerable decay when a loose surface structure is formed. The position of the maximum depends on the polymer chemical composition and molecular weight. The results on the overlapping surface pressure range confirm the dynamic equivalence of spread and adsorbed monolayers. At low surface concentration, the agreement between static and dynamic elasticity is quite satisfactory, but the values diverge considerably at higher surface pressures. The loss modulus omegakappa decreases monotonically with increasing omega, becoming zero (it can even take apparent negative values) for the highest frequencies. The frequency dependence of the elasticity has been well described by the diffusive control model of Lucassen-van den Tempel (LVT). However, its predictions for omegakappa do not coincide with the experimental data. The differences between experimental and theoretical values increase at low frequencies.
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Affiliation(s)
- Ana M Díez-Pascual
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040-Madrid, Spain
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11
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Wu D, Xu G, Feng Y, Li Y. Aggregation behaviors of gelatin with cationic gemini surfactant at air/water interface. Int J Biol Macromol 2007; 40:345-50. [PMID: 17055045 DOI: 10.1016/j.ijbiomac.2006.09.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 09/07/2006] [Accepted: 09/07/2006] [Indexed: 11/23/2022]
Abstract
The dilational rheological properties of gelatin with cationic gemini surfactant 1,2-ethane bis(dimethyl dodecyl ammonium bromide) (C(12)C(2)C(12)) at air/water interface were investigated using oscillating barriers method at low frequency (0.005-0.1 Hz), which was compared with single-chain surfactant dodecyltrimethyl ammonium bromide (DTAB). The results indicate that the maximum dilational modulus and the film stability of gelatin-C(12)C(2)C(12) are higher than those of gelatin-DTAB. At high concentration of C(12)C(2)C(12) or DTAB, the dilational modulus of gelatin-surfactant system becomes close to that corresponding to pure surfactant, suggesting gelatin at interface is replaced by surfactant. This replacement is also observed by surface tension measurement. However, it is found that gelatin-C(12)C(2)C(12) system has two obvious breaks but gelatin-DTAB has not in surface tension isotherms. These phenomena are ascribed to the double charges and strong hydrophobicity of C(12)C(2)C(12). Based on these experimental results, a mechanism of gelatin-surfactant interaction at air/water interface is proposed.
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Affiliation(s)
- Dan Wu
- Key Laboratory of Colloid & Interface Chemistry (Shandong University), Education Ministry, Jinan 250100, PR China
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12
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Hilles H, Monroy F, Bonales LJ, Ortega F, Rubio RG. Fourier-transform rheology of polymer Langmuir monolayers: analysis of the non-linear and plastic behaviors. Adv Colloid Interface Sci 2006; 122:67-77. [PMID: 16875640 DOI: 10.1016/j.cis.2006.06.013] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The linear regime (LR) of viscoelastic behavior has been found to be limited to rather small values of strain, well below the strains found in many technological processes. A Fourier-transform method is described for analyzing the surface rheology data obtained in insoluble Langmuir polymer monolayers beyond the LR. In the concentrate regime, the monolayers show a transition from elastic to plastic behavior, which is characterized by high irreversibility. A simple 2-D rubber model is presented that describes the behavior of the monolayers in the non-linear region not too far from the end of the LR.
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Affiliation(s)
- Hani Hilles
- Dept. Química Física I, Fac. Química, Univ. Complutense, 28040-Madrid, Spain
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13
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Rojas OJ, Neuman RD, Claesson PM. Viscoelastic Properties of Isomeric Alkylglucoside Surfactants Studied by Surface Light Scattering. J Phys Chem B 2005; 109:22440-8. [PMID: 16853923 DOI: 10.1021/jp054132w] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Surface light scattering (SLS) by capillary waves was used to investigate the adsorption behavior of non-ionic sugar surfactants at the air/liquid interface. SLS by the subphase (water) followed predictions from hydrodynamic theory. The viscoelastic properties (surface elasticity and surface viscosity) of monolayers formed by octyl beta-glucoside, octyl alpha-glucoside, and 2-ethylhexyl alpha-glucoside surfactants were quantified at submicellar concentrations. It is further concluded that a diffusional relaxation model describes the observed trends in high-frequency, nonintrusive laser light scattering experiments. The interfacial diffusion coefficients that resulted from fitting this diffusional relaxation model to surface elasticity values obtained with SLS reflect the molecular dynamics of the subphase near the interface. However, differences from the theoretical predictions indicate the existence of effects not accounted for such as thermal convection, molecular rearrangements, and other relaxation mechanisms within the monolayer. Our results demonstrate important differences in molecular packing at the air-water interface for the studied isomeric surfactants.
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Affiliation(s)
- Orlando J Rojas
- Forest Biomaterials Laboratory, College of Natural Resources, North Carolina State University, Box 8005, Raleigh, North Carolina 27695, USA.
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14
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Velázquez MM, Ortega F, Monroy F, Rubio RG, Pegiadou S, Pérez L, Infante MR. Langmuir monolayers of the zwitterionic surfactant hexadecyl 1-N-l-tryptophan glycerol ether. J Colloid Interface Sci 2005; 283:144-52. [PMID: 15694435 DOI: 10.1016/j.jcis.2004.08.173] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2003] [Accepted: 08/11/2004] [Indexed: 10/26/2022]
Abstract
We report the formation of Langmuir monolayers of pure zwitterionic hexadecyl 1-N-L-tryptophan glycerol ether (C(16)-TGE) surfactant and mixed monolayers of cationic-zwitterionic surfactant obtained modifying the pH of the subphase. The pressure-area and surface potential-area isotherms and fluorescence microscopy measurements have been used to characterize the surface phase transitions in the monolayers. These transitions appeared at larger areas as the pH decreased from 6.0 to 2.0 and almost disappeared as the pH decreased further. The analysis of the surface potential and the infrared reflection-absorption spectroscopy data suggests that the phase transition is associated with a change of orientation of both the hydrocarbon chain and the aromatic group of the surfactant with respect to the air-water surface. The surface rheology of the monolayers was studied by quasielastic light scattering and by the oscillatory barrier technique. The results indicate that there is at least one relaxation process in the monolayer.
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Affiliation(s)
- M Mercedes Velázquez
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Salamanca, 37008 Salamanca, Spain.
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15
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Lopez JM, Vogel MJ, Hirsa AH. Influence of coexisting phases on the surface dilatational viscosity of Langmuir monolayers. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 70:056308. [PMID: 15600754 DOI: 10.1103/physreve.70.056308] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2004] [Revised: 04/27/2004] [Indexed: 05/24/2023]
Abstract
Monolayer hydrodynamics are usually described in terms of a Newtonian constitutive relationship. However, this macroscopic view fails to account for small-scale coexisting phase domains, which are generally present in the monolayer and appear to have profound macroscopic effects. Here, we provide direct evidence of these effects, consisting of Brewster angle microscopy images of the monolayer, space- and time-resolved interfacial velocity measurements, and comparisons with predictions based on the Navier-Stokes equations together with the classic model for a Newtonian interface.
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Affiliation(s)
- Juan M Lopez
- Department of Mathematics and Statistics, Arizona State University, Tempe, Arizona 85287, USA
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16
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Wang YY, Dai YH, Zhang L, Luo L, Chu YP, Zhao S, Li MZ, Wang EJ, Yu JY. Hydrophobically Modified Associating Polyacrylamide Solutions: Relaxation Processes and Dilational Properties at the Oil−Water Interface. Macromolecules 2004. [DOI: 10.1021/ma049923v] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yi-Yang Wang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Yu-Hua Dai
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Lu Zhang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Lan Luo
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Yan-Ping Chu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Sui Zhao
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Miao-Zhen Li
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Er-Jian Wang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Jia-Yong Yu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
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17
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Cicuta P, Hopkinson I. Recent developments of surface light scattering as a tool for optical-rheology of polymer monolayers. Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2003.11.025] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Noskov BA, Akentiev AV, Bilibin AY, Zorin IM, Miller R. Dilational surface viscoelasticity of polymer solutions. Adv Colloid Interface Sci 2003; 104:245-71. [PMID: 12818499 DOI: 10.1016/s0001-8686(03)00045-9] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A review of recent results on the dilational surface viscoelastic properties of aqueous solutions of non-ionic polymers is given. In the frequency range from 0.001 up to 1000 Hz the methods of transverse and longitudinal surface waves and the oscillating barrier method were applied. Viscoelastic behavior of adsorbed polymer films significantly differs from the behavior of films formed by only conventional surfactants of low molecular weight. For example, the dynamic surface elasticity of the former systems is low and almost constant in a broad concentration range. One can observe the increase of the surface elasticity only at extremely low concentrations and/or in the range of semi-dilute solutions. If the surface stress relaxation in conventional surfactant solutions is usually determined by the diffusional exchange between the surface layer and the bulk phase, the relaxation processes in the polymer systems proceed mainly inside the surface layer. Possible mechanism of the latter relaxation is discussed.
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Affiliation(s)
- B A Noskov
- Chemical Department, St Petersburg State University, Universitetsky pr 2, 198904 St Petersburg, Russia.
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Rivillon S, Muñoz MG, Monroy F, Ortega F, Rubio RG. Experimental Study of the Dynamic Properties of Monolayers of PS−PEO Block Copolymers: The Attractive Monomer Surface Case. Macromolecules 2003. [DOI: 10.1021/ma021260z] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sandrine Rivillon
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Mercedes G. Muñoz
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Francisco Monroy
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Francisco Ortega
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
| | - Ramón G. Rubio
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
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Noskov BA, Akentiev AV, Miller R. Dynamic Surface Properties of Poly(vinylpyrrolidone) Solutions. J Colloid Interface Sci 2002; 255:417-24. [PMID: 12505091 DOI: 10.1006/jcis.2002.8614] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The dynamic surface tension and the complex dynamic surface elasticity of poly(vinylpyrrolidone) (PVP) solutions were measured in the concentration range 10(-5) wt% up to about 1 wt%. The surface tension changed slowly with time at low (<10(-4) wt%) and high concentrations (>0.1 wt%). At low concentrations this is a consequence of the slow transport by diffusion of PVP molecules from the depth of the bulk phase to the surface. At high concentrations the time effect is unexpected and probably the result of PVP contamination of high surface activity. The dynamic surface elasticity of PVP solutions gradually decreases with increasing concentration up to the range of high concentrations (>0.1 wt%) where an abrupt increase in the elasticity caused by the adsorbed impurity is observed. At low and medium concentrations the viscoelastic behavior of PVP adsorbed films is similar to that of the previously investigated poly(ethylene oxide) and poly(ethylene glycol) films and is determined by the number of loops and tails protruding into the bulk phase.
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Affiliation(s)
- B A Noskov
- Chemical Faculty, St. Petersburg State University, Univesitetskiy pr. 2, St. Petersburg-Stary Petergof, Russia
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Monroy F, Muñoz MG, Rubio JEF, Ortega F, Rubio RG. Capillary Waves in Ionic Surfactant Solutions: Effects of the Electrostatic Adsorption Barrier and Analysis in Terms of a New Dispersion Equation. J Phys Chem B 2002. [DOI: 10.1021/jp012044f] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francisco Monroy
- Department Química Física I, Facultad de Química, Universidad Complutense, E28040-Madrid, Spain
| | - Mercedes G. Muñoz
- Department Química Física I, Facultad de Química, Universidad Complutense, E28040-Madrid, Spain
| | - José E. F. Rubio
- Department Química Física I, Facultad de Química, Universidad Complutense, E28040-Madrid, Spain
| | - Francisco Ortega
- Department Química Física I, Facultad de Química, Universidad Complutense, E28040-Madrid, Spain
| | - Ramón G. Rubio
- Department Química Física I, Facultad de Química, Universidad Complutense, E28040-Madrid, Spain
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Cicuta P, Hopkinson I. Dynamic light scattering from colloidal fractal monolayers. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 65:041404. [PMID: 12005821 DOI: 10.1103/physreve.65.041404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2001] [Indexed: 05/23/2023]
Abstract
We address experimentally the problem of how the structure of a surface monolayer determines the viscoelasticity of the interface. Optical microscopy and surface quasielastic light scattering have been used to characterize aggregation of CaCO3 particles at the air-water interface. The structures formed by cluster-cluster aggregation are two-dimensional fractals that grow to eventually form a percolating network. This process is measured through image analysis. On the same system we measure the dynamics of interfacial thermal fluctuations (surface ripplons), and we discuss how the relaxation process is affected by the growing clusters. We show that the structures start damping the ripplons strongly when the two length scales are comparable. No macroscopic surface pressure is measured and this is in contrast to lipid, surfactant, or polymer monolayers at concentrations corresponding to surface coverage. This observation and the difficulty in fitting the ripplon spectrum with traditional models suggest that a different physical mechanism might be responsible for the observed damping of ripplons in this system.
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Affiliation(s)
- Pietro Cicuta
- Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.
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Noskov BA, Akentiev AV, Miller R. Dynamic Properties of Poly(styrene)–Poly(ethylene oxide) Diblock Copolymer Films at the Air–Water Interface. J Colloid Interface Sci 2002; 247:117-24. [PMID: 16290446 DOI: 10.1006/jcis.2001.8121] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2001] [Accepted: 11/24/2001] [Indexed: 11/22/2022]
Abstract
The complex dynamic elasticity of monolayers of the diblock copolymer poly(styrene)-poly(ethylene oxide) at the air-water interface in the pancake, quasi-brush, and brush regimes has been studied by means of three experimental techniques--the surface transverse and longitudinal waves and the oscillating barrier method. In the pancake regime the surface viscoelastic properties in the frequency range under investigation (0.01-520 Hz) prove to be indistinguishable from the surface properties of the homopolymer PEO. Transition to the quasi-brush regime is accompanied by rather abrupt changes in both components of the surface viscoelasticity. The surface viscosity in the brush regime exceeds significantly the results calculated from the theory of D. M. A. Buzza et al. (J. Chem. Phys.109, 5008 (1998)), which takes into account the dissipation arising from the flow of solvent through the brush phase. Possible reasons of this discrepancy are discussed.
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Affiliation(s)
- B A Noskov
- Chemical Faculty, St. Petersburg State University, Universitetskij pr. 2, St. Petersburg-Starij Petergof, 198904, Russia
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26
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Monroy F, Rivillon S, Ortega F, Rubio RG. Dilational rheology of Langmuir polymer monolayers: Poor-solvent conditions. J Chem Phys 2001. [DOI: 10.1063/1.1373643] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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Cicuta P, Hopkinson I. Studies of a weak polyampholyte at the air–buffer interface: The effect of varyingpH and ionic strength. J Chem Phys 2001. [DOI: 10.1063/1.1365401] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Esker AR, Zhang LH, Sauer BB, Lee W, Yu H. Dilational viscoelastic behaviors of homopolymer monolayers: surface light scattering analysis. Colloids Surf A Physicochem Eng Asp 2000. [DOI: 10.1016/s0927-7757(99)00564-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Alexander M, Richards RW. Capillary Wave Phenomena at the Air Interface of Aqueous Dispersions of a Linear Polystyrene−Poly(ethylene oxide) Diblock Copolymer. J Phys Chem B 2000. [DOI: 10.1021/jp000514k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marcella Alexander
- Interdisciplinary Research Centre in Polymer Science, and Technology University of Durham, Durham DH1 3LE, U.K
| | - Randal W. Richards
- Interdisciplinary Research Centre in Polymer Science, and Technology University of Durham, Durham DH1 3LE, U.K
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30
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Noskov BA, Akentiev AV, Loglio G, Miller R. Dynamic Surface Properties of Solutions of Poly(ethylene oxide) and Polyethylene Glycols. J Phys Chem B 2000. [DOI: 10.1021/jp992237r] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Milling AJ, Richards RW, Hiorns RC, Jones RG. Surface Viscoelastic Properties of Spread Films of a Polysilylene−Poly(ethylene oxide) Multiblock Copolymer at the Air−Water Interface. Macromolecules 2000. [DOI: 10.1021/ma990654w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. J. Milling
- IRC in Polymer Science and Technology, University of Durham, Durham DH1 3LE, UK, and Centre for Materials Research, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR, UK
| | - R. W. Richards
- IRC in Polymer Science and Technology, University of Durham, Durham DH1 3LE, UK, and Centre for Materials Research, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR, UK
| | - R. C. Hiorns
- IRC in Polymer Science and Technology, University of Durham, Durham DH1 3LE, UK, and Centre for Materials Research, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR, UK
| | - R. G. Jones
- IRC in Polymer Science and Technology, University of Durham, Durham DH1 3LE, UK, and Centre for Materials Research, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NR, UK
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32
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Earnshaw JC, Grattan MWD, Lunkenheimer K, Rosenthal U. The Effect of Inhibition of Molecular Reorientation and the Resulting Consequences for the Dilatational Elastic Modulus. J Phys Chem B 2000. [DOI: 10.1021/jp992797q] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. C. Earnshaw
- Irish Centre for Colloid Science and Biomaterials, The Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland
| | - M. W. D. Grattan
- Irish Centre for Colloid Science and Biomaterials, The Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland
| | - K. Lunkenheimer
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg 2, D-14476 Golm/Potsdam, Germany
| | - U. Rosenthal
- Institut für Organische Katalyseforschung, an der Universität Rostock e.V., Buchbinderstrasse 5-6, D-18055 Rostock, Germany
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33
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Giermanska-Kahn J, Monroy F, Langevin D. Negative effective surface viscosities in insoluble fatty acid monolayers: effect of phase transitions on dilational viscoelasticity. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:7163-73. [PMID: 11970658 DOI: 10.1103/physreve.60.7163] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/1999] [Indexed: 04/18/2023]
Abstract
The viscoelastic properties of insoluble monolayers have been investigated by the excited electrocapillary waves method. Effective negative values of dilational viscosities have been obtained in the liquid expanded and liquid condensed phases of insoluble monolayers of myristic, pentadecanoic, and stearic acids. However, the surface viscosity remains positive for the more expanded monolayers of ethyl palmitate ester. Possible origins of such a behavior are discussed in terms of transitional effects between the two-dimensional coexisting phases.
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Affiliation(s)
- J Giermanska-Kahn
- Centre de Recherche Paul Pascal, CNRS, av. A. Schweitzer, Château Brivazac, F33600 Pessac, France
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34
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Hernández-Contreras M, Kim MW, Pincus P. Surface hydrodynamics on a freely standing layer of a polymer solution. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1999; 60:4319-29. [PMID: 11970285 DOI: 10.1103/physreve.60.4319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/1999] [Indexed: 04/18/2023]
Abstract
The dispersion relation and the power spectrum of the surface modes on a surface-active, freely standing film of a concentrated polymer solution are studied with a two-component fluid model of a viscoelastic material. The diagram of bending modes is obtained from an asymptotic analysis of the dispersion equation when the bending rigidity modulus is the main elastic effect on the layer interface. The resulting dynamical structure factor provides the characteristic squeezing and undulation surface modes of the interfaces driven by thermal fluctuations or by a weak external perturbation. The effect of interfacial and bulk elastic properties on the power spectrum of the scattered light is studied. In the regime of an elastic solution, finite-thickness effects and bulk elastic properties of the layer sustain a train of elastic peaks when the wavelength of thermal fluctuations is comparable to the thickness of the layer. Interfacial elasticity properties increase the strength and shift all resonance frequency peaks producing a less intense quasielastic spectrum around zero frequency.
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Affiliation(s)
- M Hernández-Contreras
- Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA
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35
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Monroy F, Ortega F, Rubio RG. Rheology of a Miscible Polymer Blend at the Air−Water Interface. Quasielastic Surface Light Scattering Study and Analysis in Terms of Static and Dynamic Scaling Laws. J Phys Chem B 1999. [DOI: 10.1021/jp982548m] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francisco Monroy
- Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
| | - Francisco Ortega
- Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
| | - Ramón G. Rubio
- Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense, E-28040 Madrid, Spain
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