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Evaluation strategy towards an accurate determination of viscosity and interfacial tension by surface light scattering in presence of line-broadening effects. J Colloid Interface Sci 2022; 623:595-606. [DOI: 10.1016/j.jcis.2022.05.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 05/05/2022] [Accepted: 05/06/2022] [Indexed: 11/21/2022]
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Koller TM, Cui J, Schmidt M, Knorr J, Fröba AP. Surface light scattering in reflection geometry: capabilities and limitations. APPLIED OPTICS 2021; 60:9042-9053. [PMID: 34623984 DOI: 10.1364/ao.440071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 09/06/2021] [Indexed: 06/13/2023]
Abstract
In the present study, the capabilities and limitations of surface light scattering (SLS) experiments in reflection geometry are investigated. Based on the study of the transparent reference fluid toluene at 303.15 K over a wide range of wave vectors between (0.3and6.6)×105m-1, the performance of two different detection schemes analyzing light scattered from the vapor-liquid interface in a perpendicular and non-perpendicular direction is assessed. Considering various aspects such as the quality of the heterodyne correlation functions, the input information for data evaluation, and the line-broadening effects, both detection schemes show comparable overall efficiency. For wave vectors larger than 4.5×105m-1, where line-broadening effects are suppressed, the results obtained for liquid viscosity and surface tension agree with measurements in transmission geometry, validating the capability of the apparatus. For wave vectors smaller than 1.5×105m-1, the SLS signals are distinctly affected by line-broadening effects, which will result in erroneous values for surface tension and in particular viscosity, even if empirical fitting approaches commonly used in literature are applied. The modeling of the influence of line broadening on the measurements results by a simple Gaussian-weighted sum of individual damped oscillations reveals the increasing complexity of the underlying wave vector distribution toward smaller wave vectors chosen for the scattering geometry.
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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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Koller TM, Prucker T, Cui J, Klein T, Fröba AP. Interfacial tensions and viscosities in multiphase systems by surface light scattering (SLS). J Colloid Interface Sci 2019; 538:671-681. [DOI: 10.1016/j.jcis.2018.11.095] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 11/23/2018] [Accepted: 11/24/2018] [Indexed: 10/27/2022]
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Gong H, Xu L, Xu G, Zhu T, Dong M. Effects of Sodium Benzoate and Sodium Chloride on the Aggregation Behaviors of PEO‐PPO‐ph‐PPO‐PEO and PPO‐PEO‐ph‐PEO‐PPO at the Air/Water Interface. J SURFACTANTS DETERG 2018. [DOI: 10.1002/jsde.12213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Houjian Gong
- School of Petroleum Engineering China University of Petroleum (East China) Qingdao, 266580 P. R. China
- Key Laboratory of Colloid and Interface Chemistry Shandong University, Ministry of Education, Shandong University Jinan, 250100 P. R. China
| | - Long Xu
- School of Petroleum Engineering China University of Petroleum (East China) Qingdao, 266580 P. R. China
| | - Guiying Xu
- Key Laboratory of Colloid and Interface Chemistry Shandong University, Ministry of Education, Shandong University Jinan, 250100 P. R. China
| | - Teng Zhu
- School of Petroleum Engineering China University of Petroleum (East China) Qingdao, 266580 P. R. China
| | - Mingzhe Dong
- School of Petroleum Engineering China University of Petroleum (East China) Qingdao, 266580 P. R. China
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Monroy F. Surface hydrodynamics of viscoelastic fluids and soft solids: Surfing bulk rheology on capillary and Rayleigh waves. Adv Colloid Interface Sci 2017; 247:4-22. [PMID: 28735885 DOI: 10.1016/j.cis.2017.07.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 07/09/2017] [Accepted: 07/09/2017] [Indexed: 11/18/2022]
Abstract
From the recent advent of the new soft-micro technologies, the hydrodynamic theory of surface modes propagating on viscoelastic bodies has reinvigorated this field of technology with interesting predictions and new possible applications, so recovering its scientific interest very limited at birth to the academic scope. Today, a myriad of soft small objects, deformable meso- and micro-structures, and macroscopically viscoelastic bodies fabricated from colloids and polymers are already available in the materials catalogue. Thus, one can envisage a constellation of new soft objects fabricated by-design with a functional dynamics based on the mechanical interplay of the viscoelastic material with the medium through their interfaces. In this review, we recapitulate the field from its birth and theoretical foundation in the latest 1980s up today, through its flourishing in the 90s from the prediction of extraordinary Rayleigh modes in coexistence with ordinary capillary waves on the surface of viscoelastic fluids, a fact first confirmed in experiments by Dominique Langevin and me with soft gels [Monroy and Langevin, Phys. Rev. Lett. 81, 3167 (1998)]. With this observational discovery at sight, we not only settled the theory previously formulated a few years before, but mainly opened a new field of applications with soft materials where the mechanical interplay between surface and bulk motions matters. Also, new unpublished results from surface wave experiments performed with soft colloids are reported in this contribution, in which the analytic methods of wave surfing synthetized together with the concept of coexisting capillary-shear modes are claimed as an integrated tool to insightfully scrutinize the bulk rheology of soft solids and viscoelastic fluids. This dedicatory to the figure of Dominique Langevin includes an appraisal of the relevant theoretical aspects of the surface hydrodynamics of viscoelastic fluids, and the coverage of the most important experimental results obtained during the three decades of research on this field.
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Affiliation(s)
- Francisco Monroy
- Departamento de Química Física I, Facultad de Química, Universidad Complutense de Madrid, E28040 Madrid, Spain; Unit of Traslational Biophysics, Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), E28041 Madrid, Spain.
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Maestro A, Kotsmar C, Javadi A, Miller R, Ortega F, Rubio RG. Adsorption of β-Casein–Surfactant Mixed Layers at the Air–Water Interface Evaluated by Interfacial Rheology. J Phys Chem B 2012; 116:4898-907. [DOI: 10.1021/jp301031y] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Armando Maestro
- Departamento de Química
Física I, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain
| | - Csaba Kotsmar
- Department of Chemical and Biomolecular
Engineering, University of California at Berkeley, Berkeley, California, United States
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm, Germany
| | - Aliyar Javadi
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm, Germany
| | - Reinhard Miller
- Max-Planck Institute of Colloids and Interfaces, Potsdam-Golm, Germany
| | - Francisco Ortega
- Departamento de Química
Física I, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain
| | - Ramón G. Rubio
- Departamento de Química
Física I, Universidad Complutense de Madrid, Ciudad Universitaria s/n, 28040-Madrid, Spain
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Xin X, Xu G, Ge L, Chen Y, Wang Y, Zhang X, Guo R. Comparison of the Surface Dilational Properties of Block Copolymers and Sodium Oleate Using the Oscillating Bubble Method. J DISPER SCI TECHNOL 2010. [DOI: 10.1080/01932690903218666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Maestro A, Ortega F, Monroy F, Krägel J, Miller R. Molecular weight dependence of the shear rheology of poly(methyl methacrylate) Langmuir films: a comparison between two different rheometry techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:7393-7400. [PMID: 19326872 DOI: 10.1021/la9003033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The surface shear rheology of Langmuir monolayers of poly(methyl methacrylate) (PMMA) has been studied as a function of polymer concentration (Gamma) and molecular weight (N). Two different rheology techniques were used, one based on free damped oscillations of a ring with a sharp edge and the other based on a forced oscillation of a biconical disk. Both instruments were used in the oscillatory mode at comparable oscillation frequency and amplitude, which gave access to the viscoelastic shear modulus (S). The two instruments, working in different viscosity ranges, provide complementary and mutually compatible data. The results obtained for four PMMA samples of molecular weight between 8x10(3) and 2.7x10(5) g.mol(-1) show powerlike behavior as S approximately Gamma10 and S approximately N4. These strong dependences suggest a structural scenario based on the 2D percolation of the polymer pancakes.
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Affiliation(s)
- A Maestro
- Departamento de Química Física I, Facultad de Química, Universidad Complutense, 28040-Madrid, Spain.
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Henle ML, Levine AJ. Capillary wave dynamics on supported viscoelastic films: single and double layers. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 75:021604. [PMID: 17358350 DOI: 10.1103/physreve.75.021604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2006] [Indexed: 05/14/2023]
Abstract
We study the capillary wave dynamics of a single viscoelastic supported film and of a double layer of immiscible viscoelastic supported films. Using both simple scaling arguments and a continuum hydrodynamic theory, we investigate the effects of viscoelasticity and interfacial slip on the relaxation dynamics of these capillary waves. Our results account for the recent observation of a wavelength-independent decay rate for capillary waves in a supported polystyrene/brominated polystyrene double layer [X. Hu, Phys. Rev. E 74, 010602(R) (2006)].
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Affiliation(s)
- Mark L Henle
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA
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Noskov BA. Dynamic elasticity of triblock copolymer of poly(ethylene oxide) and poly(propylene oxide) on a water surface. COLLOID JOURNAL 2006. [DOI: 10.1134/s1061933x06050103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Noskov BA, Lin SY, Loglio G, Rubio RG, Miller R. Dilational viscoelasticity of PEO-PPO-PEO triblock copolymer films at the air-water interface in the range of high surface pressures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2647-52. [PMID: 16519465 DOI: 10.1021/la052662d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The dynamic dilational elasticity of adsorbed and spread films of PEO-PPO-PEO triblock copolymers at the air-water interface was measured as a function of surface pressure, surface age, and frequency. At low surface pressures (<10 mN/m), the surface viscoelasticity is identical to that of PEO homopolymer films. The results at higher surface pressures can be explained by the desorption of PPO segments from the interface and then mixing with PEO segments in water. Unlike some recent results, the spread and adsorbed films are not identical. Spread films exhibit a maximum real part of the dynamic surface elasticity of about 20 mN/m and probably begin to dissolve in water at surface pressures above 19 mN/m. However, the surface elasticity of the adsorbed films decreases beyond the maximum, indicating the formation of a loose surface structure.
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Affiliation(s)
- B A Noskov
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia
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