Collapsed States of Langmuir Monolayers

Phan, Minh Dinh; Lee, Jumi; Shin, Kwanwoo

doi:10.5650/jos.ess15261

Cited by 31 publications

(22 citation statements)

References 52 publications

(46 reference statements)

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“…Upon collapse, nucleation occurs at the phase boundary due to the curvature because the film cannot be compressed further without destabilization. The decrease in the energetic barrier for nucleation leads to the formation of bilayer folds and other two-to-three-dimensional transformation, especially when there are plenty of nuclei [ 166 , 167 ]. The presence of the carboxylated modified polystyrene could provide nucleation sites and reduce the pressure required for collapse, facilitating the collapse of the film during compression [ 168 ].…”

Section: Interactions Of Particulate Matter and Pulmonary Surfactantmentioning

confidence: 99%

Interactions of particulate matter and pulmonary surfactant: Implications for human health

Wang

Liu

Zeng

2020

Advances in Colloid and Interface Science

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Particulate matter (PM), which is the primary contributor to air pollution, has become a pervasive global health threat. When PM enters into a respiratory tract, the first body tissues to be directly exposed are the cells of respiratory tissues and pulmonary surfactant. Pulmonary surfactant is a pivotal component to modulate surface tension of alveoli during respiration. Many studies have proved that PM would interact with pulmonary surfactant to affect the alveolar activity, and meanwhile, pulmonary surfactant would be adsorbed to the surface of PM to change the toxic effect of PM. This review focuses on recent studies of the interactions between micro/nanoparticles (synthesized and environmental particles) and pulmonary surfactant (natural surfactant and its models), as well as the health effects caused by PM through a few significant aspects, such as surface properties of PM, including size, surface charge, hydrophobicity, shape, chemical nature, etc. Moreover, in vitro and in vivo studies have shown that PM leads to oxidative stress, inflammatory response, fibrosis, and cancerization in living bodies. By providing a comprehensive picture of PM-surfactant interaction, this review will benefit both researchers for further studies and policy-makers for setting up more appropriate regulations to reduce the adverse effects of PM on public health.

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Section: Interactions Of Particulate Matter and Pulmonary Surfactantmentioning

confidence: 99%

Interactions of particulate matter and pulmonary surfactant: Implications for human health

Wang

Liu

Zeng

2020

Advances in Colloid and Interface Science

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“…Although there are several studies on the collapse of Langmuir monolayers due to compression [64][65][66][67] there are fewer on the spontaneous collapse of monolayers induced by solutes. Recently, a spontaneous monolayer to inverted bilayer transformation of palmitic acid in the presence of calcium ions has been reported.…”

Section: Discussionmentioning

confidence: 99%

Spontaneous and Ion-Specific Formation of Inverted Bilayers at Air/Aqueous Interface

Nayak

Kumal

Uysal

2021

Preprint

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Amphiphilic lipid-ion interactions at aqueous interfaces drive the assisted ion transport in various biological and industrial systems. In chemical separations of heavy elements, lipids coordinate metal ions and solubilize them in an organic phase. Direct observation of lipid-metal interactions is highly difficult at the buried oil/water interface, and is accessible with limited experiments. Here, we demonstrate that inverted bilayer structures previously observed at oil/aqueous interfaces can also be formed at the air/aqueous interface. This facilitates the easier study of lipid-ion interactions over a wide range of parameters with multiple probes, including synchrotron X-ray reflectivity (XR), X-ray fluorescence near total reflection (XFNTR), and vibrational sum-frequency generation spectroscopy (VSFG). The formation of bilayers is highly sensitive to the metal ion charge density. While Lu3+ (115 C/mm3) lead to bilayer formation, Nd3+ (82 C/mm3) and Sr2+ (33 C/mm3) lead to monolayers. By introducing Lu3+ ions to preformed lipid monolayers, we extract kinetic parameters corresponding to monolayer to inverted bilayer conversion. Temperature-dependent studies show Arrhenius behavior with an energy barrier of 40 kcal/mol. The kinetics of monolayer to inverted bilayer conversion is also affected by the presence of background salts where thiocyanate accelerates the conversion more than nitrate does. Our results show the outsized importance of ion-specific effects on interfacial structure and kinetics, pointing to their role in chemical separation methods. Finally, this model system can be used to study a wide variety of lipid-ion interactions, opening a new avenue in molecular-scale understanding of these important systems.

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“…The shape of the p-A isotherms depend, among other aspects, on the nature of amphiphiles, compression speed, spreading conditions and temperature. For classical amphiphiles, the isotherm can roughly be classified into four different regions and the corresponding transition regions: a two-dimensional gaseous (G) phase, a liquid-expanded (LE) phase, followed by liquid-condensed (LC) and a two-dimensional solid (S) phase, where the maximally reached surface pressure is called the collapse pressure (figure 3) [39,40]. Between the G and LE and the LE and LC phases, first-order transition takes place revealing a (pseudo)plateau region (coexisting region).…”

Section: General Principlesmentioning

confidence: 99%

Evaluating polymeric biomaterial–environment interfaces by Langmuir monolayer techniques

Schöne

Roch

Schulz

et al. 2017

J. R. Soc. Interface.

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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 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 behaviour.

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Collapsed States of Langmuir Monolayers

Cited by 31 publications

References 52 publications

Interactions of particulate matter and pulmonary surfactant: Implications for human health

Interactions of particulate matter and pulmonary surfactant: Implications for human health

Spontaneous and Ion-Specific Formation of Inverted Bilayers at Air/Aqueous Interface

Evaluating polymeric biomaterial–environment interfaces by Langmuir monolayer techniques

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