Rheological Behavior of Polydimethylsiloxane Langmuir Layers at the Air-Water Interface

Malakhova, Yu. N.; Stupnikov, A. A.; Chekusova, Victoria P.; Kuznetsov, Nikita M.; Белоусов, С. И.

doi:10.1007/s12668-020-00728-y

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…2b) . Therefore, as reported previously, the surface properties and rheological changes induced by PHMG exposure could potentially trigger alveolar instability and atelectasis 40) .…”

Section: Fluorescent Microscopy Analysis Of Ls Monolayer Lipid Domainssupporting

confidence: 52%

Adsorption of CMIT/MIT on the Model Pulmonary Surfactant Monolayers

Park,

Ko,

Choi

et al. 2024

J. Oleo Sci.

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IntroductionGuanidine-based antimicrobials have been widely employed for the disinfection, sterilization, and preservation of various products, such as food and cosmetics 1−4) . The efficacy of polyhexamethylene guanidine (PHMG) is primarily attributed to the robust interaction between the positively charged guanidine group at physiological pH and the negatively charged phosphatidylglycerol (PG) lipid bilayer in the bacterial cell membranes 5−7) . In contrast, PHMG has negligible effects on zwitterionic lipid membranes, such as phosphatidylcholine (PC) and phosphatidylethanolamine (PE) , the primary components of fish and mammalian cell membranes 8, 9) . For these reasons, guanidine-based antimicrobials are believed not to harm host cells and selectively target only microorganisms intended for destruction.However, a few traumatic incidents have recently killed or induced permanent disabilities in many people. In South Korea, PHMG was used as a humidifier disinfectant additive from 1998 to 2011, which resulted in more than 1,500

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“…2b) . Therefore, as reported previously, the surface properties and rheological changes induced by PHMG exposure could potentially trigger alveolar instability and atelectasis 40) .…”

Section: Fluorescent Microscopy Analysis Of Ls Monolayer Lipid Domainssupporting

confidence: 52%

Adsorption of CMIT/MIT on the Model Pulmonary Surfactant Monolayers

Park,

Ko,

Choi

et al. 2024

J. Oleo Sci.

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“…Polymethylphenylsiloxane (PMPS) shows a region A and B with a lift‐off area of ≈0.28 nm 2 but no evidence of any region C. Conversely, Polydiethylsiloxane (PDES) appears to exhibit only regions C and D. More details on these studies are given in the chapter by Esker and Yu [ 41 ] where various other Langmuir trough studies of silicones are reviewed. Note also a recent Russian study [ 47 ] of the viscous and elastic components of Langmuir layers of PDMS at the air–water interface using a barrier oscillation method.…”

Section: Silicone/water Interfacementioning

confidence: 99%

Silicone Surface Fundamentals

Owen

2020

Macromol. Rapid Commun.

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Many of the applications of the most familiar silicone polymer, polydimethylsiloxane (PDMS), are a consequence of its hydrophobic nature. The key quantities underlying this behavior are the water contact angle with water droplets, the surface tension of the polymer, and its interfacial tension with water. These quantities are reviewed for PDMS and the fluorsilicone polymethyltrifluoropropylsiloxane (PMTFPS) as well as some other less common, more highly fluorinated, fluorosilicones. As aliphatic fluorocarbons are usually introduced into polymers to lower surface tension, it is unexpected that the surface tension of PMTFPS is higher than PDMS. However, this observation is consistent with Zisman's early extensive studies. It is also somewhat surprising that there are no definitive values accepted for the water contact angle with PDMS and the interfacial tension at the PDMS/water interface. Some reasons for this are explored and relevant limitations considered. The variety of ways in which a PDMS surface can be presented must have a major effect on the range of water contact angles reported.

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“…The application of nanomaterials often requires a thin film on the desired surface, which ideally should be grown directly on the substrate . Characteristics of such films depend on the temperature, pH, lyophilic–lyophobic interactions, electric charge, molecular mass, and compression speed of the barriers in the Langmuir trough. , Several of the above-mentioned conditions and properties influence the monolayer thickness. Appropriate packaging and pressure allow precise control of the thickness, size, and architecture of the monolayer …”

Section: Introductionmentioning

confidence: 99%

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

et al. 2022

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Characterization of bidimensional polymeric films at the air−water interface in the Langmuir trough, despite being a recurrent topic, usually refers to films of already formed polymeric materials, with very scarce reports on direct polymerization at the air−water interface. In the present work, we studied the photopolymerization of stearyl methacrylate directly at the air−water interface under a nitrogen atmosphere, with the radical initiator solubilized in the aqueous phase. Two-dimensional (2D) polymerization was monitored by measuring the pressure−area isotherm at different irradiation times. The polymerization leads to a film with an isotherm different from that observed for the monomer, where the surface pressure is directly related to the irradiation time. The shape of this isotherm confirms the presence of a compressed liquid phase, where a higher order can be attained as a consequence of stronger packing forces involving polymer chains. The presence of inter-chain interactions allows rearrangements on the surface of the subphase, and even before the collapse a dense 2D ordering (with a solid phase-like behavior) can be observed. We present a new one-step, solvent-free procedure to obtain a photopolymeric film directly at the air−water interface, which can be transferred to a solid surface by the Langmuir−Blodgett method, allowing film preparation of controlled thickness. Films were characterized by measuring properties such as thickness, roughness, and hydrophobicity and comparing them with films obtained from a conventional polymer. We report the differences between the interfacial behavior of amphiphilic molecules and nanomaterials such as films obtained by photo-polymerization, PSMA, directly on the air−water interface.

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Rheological Behavior of Polydimethylsiloxane Langmuir Layers at the Air-Water Interface

Cited by 9 publications

References 34 publications

Adsorption of CMIT/MIT on the Model Pulmonary Surfactant Monolayers

Adsorption of CMIT/MIT on the Model Pulmonary Surfactant Monolayers

Silicone Surface Fundamentals

On the Preparation of Thin Films of Stearyl Methacrylate Directly Photo-polymerized at the Air–Water Interface

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