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Applications of Brewster angle microscopy from biological materials to biological systems. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1749-1766. [PMID: 28655618 DOI: 10.1016/j.bbamem.2017.06.016] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 12/22/2022]
Abstract
Brewster angle microscopy (BAM) is a powerful technique that allows for real-time visualization of Langmuir monolayers. The lateral organization of these films can be investigated, including phase separation and the formation of domains, which may be of different sizes and shapes depending on the properties of the monolayer. Different molecules or small changes within a molecule such as the molecule's length or presence of a double bond can alter the monolayer's lateral organization that is usually undetected using surface pressure-area isotherms. The effect of such changes can be clearly observed using BAM in real-time, under full hydration, which is an experimental advantage in many cases. While previous BAM reviews focused more on selected compounds or compared the impact of structural variations on the lateral domain formation, this review provided a broader overview of BAM application using biological materials and systems including the visualization of amphiphilic molecules, proteins, drugs, extracts, DNA, and nanoparticles at the air-water interface.
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Vorobiev A, Khassanov A, Ukleev V, Snigireva I, Konovalov O. Substantial Difference in Ordering of 10, 15, and 20 nm Iron Oxide Nanoparticles on a Water Surface: In Situ Characterization by the Grazing Incidence X-ray Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11639-11648. [PMID: 26399881 DOI: 10.1021/acs.langmuir.5b02644] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the present study, for the first time, a unique combination of in situ grazing incidence small-angle X-ray scattering and X-ray reflectivity, accompanied by the pressure-area isotherm analysis, Brewster angle microscopy, and ex situ scanning electron microscopy, was applied for investigation of two-dimensional superlattices of magnetic nanoparticles as they form on a water surface in a Langmuir trough. Iron oxide particles of different sizes stabilized with a single layer of oleic acid were used. It is demonstrated that monodisperse 10 nm particles on a water surface reproducibly form identical highly ordered monolayers in a wide range of experimental conditions, while monodisperse 20 nm particles always form compact three-dimensional clusters and never the monolayers. Monodisperse particles of an intermediate size, 15 nm in diameter, build a metastable monolayer, which shows a tendency for spontaneous transformation to bi-, tri-, and multilayer islands. The importance to use both grazing incidence small-angle X-ray scattering and X-ray reflectivity together with the complementary techniques, to avoid misinterpretation of separate experimental data sets, is underlined.
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Affiliation(s)
- A Vorobiev
- Department of Physics and Astronomy, Uppsala University , Box 516, 751 20 Uppsala, Sweden
- European Synchrotron Radiation Facility , 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
| | - A Khassanov
- European Synchrotron Radiation Facility , 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
- Organic Materials and Devices, Friedrich-Alexander-Universität Erlangen-Nürnberg , Martensstraße 7, 91058 Erlangen, Germany
| | - V Ukleev
- Department of Physics and Astronomy, Uppsala University , Box 516, 751 20 Uppsala, Sweden
- Petersburg Nuclear Physics Institute , Orlova Roscha, Gatchina, St. Petersburg 188300, Russia
| | - I Snigireva
- European Synchrotron Radiation Facility , 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
| | - O Konovalov
- European Synchrotron Radiation Facility , 71 Avenue des Martyrs, CS 40220, 38043 Grenoble Cedex 9, France
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Wieland DF, Degen P, Paulus M, Schroer MA, Rehage H, Tolan M. pH controlled condensation of polysiloxane networks at the water–air interface. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.03.099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Adsorption of nanoparticles at the solid–liquid interface. J Colloid Interface Sci 2012; 374:287-90. [DOI: 10.1016/j.jcis.2012.02.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 02/03/2012] [Accepted: 02/04/2012] [Indexed: 11/20/2022]
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Paulus M, Degen P, Brenner T, Tiemeyer S, Struth B, Tolan M, Rehage H. Sticking polydisperse hydrophobic magnetite nanoparticles to lipid membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15945-15947. [PMID: 20873726 DOI: 10.1021/la102882j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The formation of a layer of hydrophobic magnetite (Fe(3)O(4)) nanoparticles stabilized by lauric acid is analyzed by in situ X-ray reflectivity measurements. The data analysis shows that the nanoparticles partially disperse their hydrophobic coating. Consequently, a Langmuir layer was formed by lauric acid molecules that can be compressed into an untilted condensed phase. A majority of the nanoparticles are attached to the Langmuir film integrating lauric acid residue on their surface into the Langmuir film. Hence, the particles at the liquid-gas interface can be identified as so-called Janus beads, which are amphiphilic solids having two sides with different functionality.
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Affiliation(s)
- Michael Paulus
- TU Dortmund, Fakultät Physik/DELTA, Maria Goeppert Mayer Strasse 2, 44227 Dortmund, Germany.
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