Langmuir Trough
Langmuir Trough - Related Videos
10:44
Preparation of Carbon Nanosheets at Room Temperature
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2016
We present the synthesis of an amphiphilic hexayne and its use in the preparation of carbon nanosheets at the air-water interface from a self-assembled monolayer of these reactive, carbon-rich molecular precursors.
08:10
Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas
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Cited by 3 •
2021
The main goal of this work is to make it easier for research groups unfamiliar with Langmuir probes and emissive probes to use them as plasma diagnostics, especially near plasma boundaries. We do this by demonstrating how to build the probes from readily available materials and supplies.
12:22
Preparation of Thermoresponsive Nanostructured Surfaces for Tissue Engineering
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Cited by 5 •
2016
Nanoscaled sea-island surfaces composed of thermoresponsive block copolymers were fabricated by the Langmuir-Schaefer method for controlling spontaneous cell adhesion and detachment. Both the preparation of the surface and the adhesion and detachment of cells on the surface were visualized.
10:34
Ligand Nano-cluster Arrays in a Supported Lipid Bilayer
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Cited by 3 •
2017
We present a protocol to functionalize glass with nanometric protein patches surrounded by a fluid lipid bilayer. These substrates are compatible with advanced optical microscopy and are expected to serve as platform for cell adhesion and migration studies.
08:56
Catalytic Reactor: Hydrogenation of Ethylene
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA The hydrogenation of ethylene (C2H4) to ethane (C2H6) has often been studied as a model reduction reaction in characterizing new metal catalysts.1-2 While supported nickel is not the most active metal catalyst for this reaction, it is active enough that reaction can take place at < 200°C. The reaction typically involves adsorbed, dissociated hydrogen (H2) reacting...
FAQs
An isotherm connects the monolayer’s surface pressure with the molecular area during compression. Changes in the curve can indicate transitions between different packing states, while the overall profile provides information about molecular organization, film stability, and interactions within the layer. Chemists therefore use the isotherm as a compact representation of how the film responds to reduced area.
The movable barriers progressively reduce the available surface area, creating controlled changes in molecular packing. A sensor simultaneously records the resulting surface pressure, allowing the instrument to relate compression to interfacial behavior. Coordinating these two measurements is essential because molecular area alone does not show how strongly the monolayer responds as its organization changes.
These measurements can distinguish changes associated with molecular packing, phase transitions, film stability, and interactions within the monolayer. A transition in the pressure–area response may show that the molecules have reorganized, whereas instability can indicate that the film does not maintain consistent interfacial behavior during compression. Such distinctions help connect macroscopic measurements with molecular organization.
A typical sequence confines a liquid subphase in the trough, establishes the amphiphilic film at the air–water interface, and then moves the barriers to change the available molecular area. The pressure sensor records the response throughout compression. The resulting pressure–area isotherm is then examined for packing behavior, transitions, stability, and intermolecular interactions.
In chemistry, Langmuir trough studies address surfactants, lipid membranes, and biomimetic films. These systems are useful because their interfacial organization can be examined through controlled changes in molecular area and measured surface pressure. The approach therefore connects studies of amphiphilic molecules with questions about membrane-like structures and designed interfacial materials.
After a monolayer has been organized and its interfacial behavior characterized, the controlled film can support preparation of Langmuir–Blodgett coatings. This application is important because it enables coatings with controlled nanoscale structure. Measurements from the trough help researchers evaluate packing and stability before using the organized film in coating preparation.