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Yadav HOS, Harada S, Kuo AT, Urata S, Shinoda W. Hemimicelle formation of semi-fluorocarbon chains at air–water interface: coarse-grained molecular dynamics study with an extension of the SPICA force field. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1910355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Hari O. S. Yadav
- Department of Materials Chemistry, Nagoya University, Nagoya, Japan
| | - Shogo Harada
- Department of Materials Chemistry, Nagoya University, Nagoya, Japan
| | - An-Tsung Kuo
- Innovative Technology Laboratories, AGC Inc., Yokohama, Japan
| | - Shingo Urata
- Innovative Technology Laboratories, AGC Inc., Yokohama, Japan
| | - Wataru Shinoda
- Department of Materials Chemistry, Nagoya University, Nagoya, Japan
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Mielke S, Liu X, Krafft MP, Tanaka M. Influence of Semifluorinated Alkane Surface Domains on Phase Behavior and Linear and Nonlinear Viscoelasticity of Phospholipid Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:781-788. [PMID: 31904974 DOI: 10.1021/acs.langmuir.9b03521] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Semifluorinated alkanes self-assemble into 30-40 nm-large surface domains (hemimicelles) at the air/water interface. They have been drawing increasing attention to stabilize microbubbles coated with lipids, which are used for enhancing the contrast in sonographic imaging. Although previous studies suggested that semifluorinated alkanes increase the stability of phospholipid membranes, little is known about how semifluorinated alkanes influence phase behaviors and mechanical properties of lipid-coated microbubbles. As a well-defined model of microbubble surfaces, we prepared monolayers consisting of a mixture of phospholipids and semifluorinated alkanes at the air/water interface and investigated the influence of hemimicelles of semifluorinated alkanes on the phase behavior and interfacial viscoelastic properties of phospholipid monolayers. Hemimicelles are phase-separated from phospholipids and accumulate at the phase boundary, which strongly modulates the correlation between solid phospholipid domains. Intringuingly, we found that the mixed monolayer of semifluorinated alkanes and phospholipids possesses linear and nonlinear viscoelastic properties comparable to those of phospholipid monolayers. Since the mixing of semifluorinated alkanes and phospholipids enables one to overcome the intrinsically low stability of pure semifluorinated alkanes against the change in the surface area of microbubbles through the partial dissolution of gas into the aqueous phase, this is a promising strategy for the stable coating of microbubbles in ultrasound diagnosis.
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Affiliation(s)
- Salomé Mielke
- Physical Chemistry of Biosystems, Institute of Physical Chemistry , Heidelberg University , D-69120 Heidelberg , Germany
| | - Xianhe Liu
- Institut Charles Sadron (CNRS UPR 22) , University of Strasbourg , 23 rue du Loess , F-67034 Strasbourg Cedex, France
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS UPR 22) , University of Strasbourg , 23 rue du Loess , F-67034 Strasbourg Cedex, France
| | - Motomu Tanaka
- Physical Chemistry of Biosystems, Institute of Physical Chemistry , Heidelberg University , D-69120 Heidelberg , Germany
- Center for Integrative Medicine and Physics, Institute for Advanced Study , Kyoto University , 606-8501 Kyoto , Japan
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Jacob AR, Parekh DP, Dickey MD, Hsiao LC. Interfacial Rheology of Gallium-Based Liquid Metals. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11774-11783. [PMID: 31407902 DOI: 10.1021/acs.langmuir.9b01821] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Gallium and its alloys react with oxygen to form a native oxide that encapsulates the liquid metal with a solid "skin". The viscoelasticity of this skin is leveraged in applications such as soft electronics, 3D printing, and components for microfluidic devices. In these applications, rheological characterization of the oxide skin is paramount for understanding and controlling liquid metals. Here, we provide a direct comparison of the viscoelastic properties for gallium-based liquid metals and illustrate the effect of different subphases and addition of a dopant on the elastic nature of the oxide skin. The du Noüy ring method is used to investigate the interfacial rheology of oxide skins formed by gallium-based liquid metal alloys. The results show that the oxide layer on gallium, eutectic gallium-indium, and Galinstan are viscoelastic with a yield stress. Furthermore, the storage modulus of the oxide layer is affected by exposure to water or when small amounts of aluminum dopant are added to the liquid metals. The former scenario decreases the interfacial storage modulus of the gallium by 35-85% while the latter increases the interfacial storage modulus by 25-45%. The presence of water also changes the chemical composition of the oxide skin. Scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy suggest that a microstructural evolution of the interface occurs when aluminum preferentially migrates from the bulk to the surface. These studies provide guidance on selecting liquid metals as well as simple methods to optimize their rheological behavior for future applications.
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Affiliation(s)
- Alan R Jacob
- Department of Chemical and Biomolecular Engineering , North Carolina State University , 911 Partners Way , Raleigh 27695 , United States
| | - Dishit P Parekh
- Department of Chemical and Biomolecular Engineering , North Carolina State University , 911 Partners Way , Raleigh 27695 , United States
| | - Michael D Dickey
- Department of Chemical and Biomolecular Engineering , North Carolina State University , 911 Partners Way , Raleigh 27695 , United States
| | - Lilian C Hsiao
- Department of Chemical and Biomolecular Engineering , North Carolina State University , 911 Partners Way , Raleigh 27695 , United States
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Liao L, Zhu XH. Advances in the treatment of rhegmatogenous retinal detachment. Int J Ophthalmol 2019; 12:660-667. [PMID: 31024823 PMCID: PMC6469565 DOI: 10.18240/ijo.2019.04.22] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 12/08/2018] [Indexed: 12/15/2022] Open
Abstract
The pathogenesis of rhegmatogenous retinal detachment depends on three factors, namely, retinal rupture, vitreous liquefaction and traction causing the retina to separate from the pigment epithelium, among which retinal rupture is the most important. Retinopathy is caused by a gap between the neurosensory retina and the retinal pigment epithelium, which severely damages the visual function of the patient. Therefore, early clinical discovery, prevention and selection of an appropriate treatment are important. This article reviews progress in the treatment of retinal detachment.
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Affiliation(s)
- Li Liao
- Department of Ophthalmology, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan Province, China
| | - Xiao-Hua Zhu
- Department of Ophthalmology, the Second Xiangya Hospital, Central South University, Changsha 410011, Hunan Province, China
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Liu X, Contal C, Schmutz M, Krafft MP. Two-Dimensional Radial or Ring-Banded Nonbirefringent Spherulites of Semifluorinated Alkanes Coexistent with Close-Packed Self-Assembled Surface Nanodomains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15126-15133. [PMID: 30403356 DOI: 10.1021/acs.langmuir.8b01893] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A series of semifluorinated alkanes (C nF2 n+1C mH2 m+1 diblocks, F n H m, n = 6, 8, 10; m = 16, 18, 20), when cast as films onto solid substrates, were found to form ring-banded or radial spherulites when heated above their isotropic temperature and subsequently cooled down to room temperature, demonstrating that the formation of two-dimensional (2D) spherulites is a general feature of molecular fluorocarbon-hydrocarbon diblocks. These spherulites are not birefringent, a seldom encountered feature for such structures (never, so far, for spherulites made of small molecules). They also provide examples of fluorinated 2D spherulites. Film morphology was analyzed by optical microscopy, interferometric profilometry, atomic force microscopy (AFM), and scanning electron microscopy. Increasing the length of the Fn segment favors the formation of ring-banded spherulites, whereas short Fn segments tend to favor extended radial stripes. Variation of the cooling rate provides control over the size and morphology of the spherulites: slow cooling promotes fibers and radial spherulites, whereas fast cooling fosters ring-banded spherulites. The AFM studies of F10 H16 films revealed that the latter consist of stacks of regularly spaced lamellae. We also observed that, remarkably, stacked lamellae (repeating distance ∼6 nm) can coexist with a layer of close-packed monodisperse circular self-assembled surface nanodomains of Fn Hm diblocks (∼30 nm in diameter); the latter are known to form from such diblocks at interfaces at room temperature. Substrates partially covered with F10 H16 contain incomplete ring-banded spherulites and smaller objects in which the lamellae and circular nanodomains coexist.
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Affiliation(s)
- Xianhe Liu
- University of Strasbourg, Institut Charles Sadron (ICS CNRS) , 23 rue du Loess , 67034 Strasbourg , France
| | - Christophe Contal
- University of Strasbourg, Institut Charles Sadron (ICS CNRS) , 23 rue du Loess , 67034 Strasbourg , France
| | - Marc Schmutz
- University of Strasbourg, Institut Charles Sadron (ICS CNRS) , 23 rue du Loess , 67034 Strasbourg , France
| | - Marie Pierre Krafft
- University of Strasbourg, Institut Charles Sadron (ICS CNRS) , 23 rue du Loess , 67034 Strasbourg , France
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Liu X, Riess JG, Krafft MP. Self-Organization of Semifluorinated Alkanes and Related Compounds at Interfaces: Thin Films, Surface Domains and Two-Dimensional Spherulites. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170431] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xianhe Liu
- Institut Charles Sadron (CNRS) University of Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
| | - Jean G. Riess
- Harangoutte Institute, 68160 Sainte Croix-aux-Mines, France
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS) University of Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
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Mielke S, Habe T, Veschgini M, Liu X, Yoshikawa K, Krafft MP, Tanaka M. Emergence of Strong Nonlinear Viscoelastic Response of Semifluorinated Alkane Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2489-2496. [PMID: 29359940 DOI: 10.1021/acs.langmuir.7b03997] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Viscoelasticity of monolayers of fluorocarbon/hydrocarbon tetrablock amphiphiles di(FnHm) ((CnF2n+1CH2)(Cm-2H2m-3)CH-CH(CnF2n+1CH2)(Cm-2H2m-3)) was characterized by interfacial dilational rheology under periodic oscillation of the moving barriers at the air/water interface. Because the frequency dispersion of the response function indicated that di(FnHm) form two-dimensional gels at the interface, the viscosity and elasticity of di(FnHm) were first analyzed with the classical Kelvin-Voigt model. However, the global shape of stress response functions clearly indicated the emergence of a nonlinearity even at very low surface pressures (π ≈ 5 mN/m) and small strain amplitudes (u0 = 1%). The Fourier-transformed response function of higher harmonics exhibited a clear increase in the intensity only from odd modes, corresponding to the nonlinear elastic component under reflection because of mirror symmetry. The emergence of strong nonlinear viscoelasticity of di(FnHm) at low surface pressures and strain amplitudes is highly unique compared to the nonlinear viscoelasticity of other surfactant systems reported previously, suggesting a large potential of such fluorocarbon/hydrocarbon molecules to modulate the mechanics of interfaces using the self-assembled domains of small molecules.
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Affiliation(s)
- Salomé Mielke
- Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany
| | - Taichi Habe
- Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany
| | - Mariam Veschgini
- Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany
| | - Xianhe Liu
- Institut Charles Sadron (CNRS), University of Strasbourg , 67034 Strasbourg, France
| | - Kenichi Yoshikawa
- Faculty of Life and Medical Sciences, Doshisha University , 610-0321 Kyotanabe, Japan
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS), University of Strasbourg , 67034 Strasbourg, France
| | - Motomu Tanaka
- Institute of Physical Chemistry, University of Heidelberg , 69120 Heidelberg, Germany
- Institute for Advanced Study, Kyoto University , 606-8501 Kyoto, Japan
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Paige MF, Eftaiha AF. Phase-separated surfactant monolayers: Exploiting immiscibility of fluorocarbons and hydrocarbons to pattern interfaces. Adv Colloid Interface Sci 2017; 248:129-146. [PMID: 28756970 DOI: 10.1016/j.cis.2017.07.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 04/21/2017] [Accepted: 07/17/2017] [Indexed: 10/19/2022]
Abstract
The mutual immiscibility of hydrogenated and fluorinated surfactants at interfaces frequently leads to phase-separation, which provides a useful and flexible method for patterning air-water and solid-air interfaces. In this article, we review recent advances in the use of hydrogenated-fluorinated surfactant mixtures to achieve interfacial patterning. For even relatively simple systems comprised of binary mixed monolayers of hydrogenated and perfluorinated fatty acids, a diverse range of film morphologies can be generated at the air-water interface and successfully transferred onto solid substrates. Systematic investigations reported over the past several years have allowed for correlation between the chemical structure of the film constituents with the gross film morphology and underlying crystalline structure of the films. Early thermodynamic models based on the interplay between dipole-dipole repulsion forces between charged headgroups balanced by line tension between phases that were formulated to describe phase-behavior in simple phospholipid monolayer systems have proven highly useful to describe morphologies for the immiscible surfactant blends. Beyond simple binary fatty acid mixtures, highly-structured films have also been reported in mixed phospholipid systems, which have found important application in controlling the physical, compositional and performance properties of lung surfactant mixtures, as well as in semifluorinated alkane monolayers which form unique, hemimicellar structures at both liquid and solid interfaces. We also describe advances in using these approaches to pattern photopolymerizable, luminescent surfactants, which have found extensive use in colorimetric and fluorometric sensing devices. The long-term outlook for this field, with an emphasis on potential applications and future research directions are discussed.
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Schöne AC, Roch T, Schulz B, Lendlein A. Evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer techniques. J R Soc Interface 2017; 14:20161028. [PMID: 28468918 PMCID: PMC5454283 DOI: 10.1098/rsif.2016.1028] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 04/05/2017] [Indexed: 12/18/2022] Open
Abstract
Polymeric biomaterials are of specific relevance in medical and pharmaceutical applications due to their wide range of tailorable properties and functionalities. The knowledge about interactions of biomaterials with their biological environment is of crucial importance for developing highly sophisticated medical devices. To achieve optimal in vivo performance, a description at the molecular level is required to gain better understanding about the surface of synthetic materials for tailoring their properties. This is still challenging and requires the comprehensive characterization of morphological structures, polymer chain arrangements and degradation behaviour. The review discusses selected aspects for evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer methods as powerful techniques for studying interfacial properties, such as morphological and degradation processes. The combination of spectroscopic, microscopic and scattering methods with the Langmuir techniques adapted to polymers can substantially improve the understanding of their in vivo behaviour.
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Affiliation(s)
- Anne-Christin Schöne
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Toralf Roch
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
| | - Burkhard Schulz
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
| | - Andreas Lendlein
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
- Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, Kantstrasse 55, 14513 Teltow, Germany
- Helmholtz Virtual Institute-Multifunctional Biomaterials for Medicine, Kantstrasse 55, 14513 Teltow, Germany
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Truzzolillo D, Sharaf H, Jonas U, Loppinet B, Vlassopoulos D. Tuning the Structure and Rheology of Polystyrene Particles at the Air-Water Interface by Varying the pH. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6956-6966. [PMID: 27329929 DOI: 10.1021/acs.langmuir.6b01969] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We form films of carboxylated polystyrene particles (C-PS) at the air-water interface and investigate the effect of subphase pH on their structure and rheology by using a suite of complementary experimental techniques. Our results suggest that electrostatic interactions drive the stability and the structural order of the films. In particular, we show that by increasing the pH of the subphase from 9 up to 13, the films exhibit a gradual transition from solid to liquidlike, which is accompanied by a loss of the long-range order (that characterizes them at lower values of pH). Direct optical visualization of the layers, scanning electron microscopy, and surface pressure isotherms indicate that the particles deposited at the interface form three-dimensional structures involving clusters, with the latter being suppressed and a quasi-2D particle configuration eventually reached at the highest pH values. Evidently, the properties of colloidal films can be tailored significantly by altering the pH of the subphase.
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Affiliation(s)
- Domenico Truzzolillo
- FO.R.T.H, Institute of Electronic Structure and Laser, Heraklion, Crete, Greece
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS, Université de Montpellier , Montpellier, France
| | - Hossameldeen Sharaf
- Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Strasse 2, AR-G 213 Siegen, Germany
| | - Ulrich Jonas
- FO.R.T.H, Institute of Electronic Structure and Laser, Heraklion, Crete, Greece
- Department of Chemistry and Biology, University of Siegen , Adolf-Reichwein-Strasse 2, AR-G 213 Siegen, Germany
| | - Benoit Loppinet
- FO.R.T.H, Institute of Electronic Structure and Laser, Heraklion, Crete, Greece
| | - Dimitris Vlassopoulos
- FO.R.T.H, Institute of Electronic Structure and Laser, Heraklion, Crete, Greece
- Department of Materials Science and Technology, University of Crete , Heraklion, Crete, Greece
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