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Shanghai Aifeisi Precision Instrument Co., Ltd
KSV NIMA Langmuir membrane analyzer
NegotiableUpdate on 01/19
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Overview
The KSV NIMA Langmuir and Langmuir Blodgett membrane analyzer is widely used in the preparation, characterization (including microscopy), and deposition of Langmuir thin films. The KSV NIMA Langmuir and Langmuir Blodgett membrane analyzers can be used for the preparation and characterization of monolayer membranes, and can accurately control the lateral packing density of molecules. The KSV NIMA membrane analyzer can study the properties of molecules at the monolayer level and transfer these monolayers using Langmuir Blodgett or Langmuir Scheefer deposition techniques. Single or multi-layer molecular films can be prepared by precise control of thickness, molecular orientation, and packing density.
Product Details
Product Details
application
The preparation of insoluble monolayer films (Langmuir films) with controllable packing density at gas-liquid and liquid-liquid interfaces, and the transfer of this ordered functional film to solid surfaces (Langmuir Blodgett films), has broad application value in the field of nanotechnology
Interactions between biofilms and biomolecules
Cell membrane model (such as the interaction between proteins and ions)
Structural changes and reactions
Drug delivery and behavior
Organic and inorganic coatings
Functional materials with optical, electrical, and structural properties
New coatings such as nanotubes, nanowires, graphene, etc
surface reaction
polymerization
Immune response, enzyme substrate reaction
Biosensors, surface immobilized catalysts
Surface adsorption and desorption
Surfactants and colloids
synthesis
Colloidal stability
Emulsification, dispersion, foam stability
Rheological properties of thin films
Expansion rheology
Interface shear rheology (combined with KSV NIMA ISR)
technology
Langmuir membrane analyzer
The Langmuir membrane analyzer is suitable for preparing, modifying, and studying Langmuir membranes. Single molecular layers formed by functional molecules, nanoparticles, nanowires, or particles that are insoluble at the gas-liquid or liquid-liquid interface can be defined as Langmuir films. These molecules can move freely at the interface, have strong fluidity, and are easy to control their packing density, providing the possibility for studying the behavior of single molecular layers.
Immersing the material in the sub phase of a shallow pool (referred to as the top groove) can result in Langmuir membrane (3). Under the action of a sliding barrier, the surface monolayer can be compressed (2). The surface pressure or bulk density can be controlled by the pressure sensor (4) of the Langmuir membrane analyzer.
The Langmuir membrane analyzer allows you to infer how specific molecules stack together when confined to two-dimensional space. The surface pressure area isotherm can provide you with the average area of each molecule and the compressibility of the monolayer.
In a typical isothermal compression test, the monolayer first transitions from a two-dimensional gas phase (G) to a liquid phase (L), and finally forms an ordered solid phase (S). In the gas phase, the intermolecular interaction forces are relatively weak; When the surface area decreases, the stacking between molecules becomes more compact and interactions begin to occur; In the solid phase, the stacking of molecules is orderly, leading to a rapid increase in surface pressure. When the surface pressure reaches its maximum value, which is the collapse point, the accumulation of monolayers is no longer controllable.
The KSV NIMA Langmuir membrane analyzer can measure:
| test | information |
| isothermal | Structure, area, interaction, phase transition, compressibility, hysteresis |
| Isobaric/isochoric | Stability and Relaxation of Single Molecular Layers |
| Surface potential | Characterization of Electrochemical Properties of Single Molecular Layers |
| Expansion rheology | Viscoelasticity of membrane |
| dynamics | Dynamics of enzymes injected into the subphase |
| conductivity | Lateral conductivity |
| environmental monitoring | PH value and temperature |
Conventional Langmuir system
The Langmuir tank includes a tank containing a sub phase (usually water) and a monolayer, a sliding barrier for adjusting the monolayer area, and a balance for monitoring surface pressure. There are several sizes of conventional KSV NIMA Langmuir slots: ultra small slot, small slot, medium slot, and large slot. The volume of the ultra small groove is the smallest, but the surface area is larger than that of the small groove. The three smaller tank bodies all use the same frame and can be adjusted to different sizes at any time. The liquid-liquid tank or high-pressure shrink tank adopts a larger frame, but is also suitable for smaller tank bodies. The different types of tanks are as follows.
Liquid tank
Liquid liquid tanks can be used for single-molecule layer studies of oil-water interfaces. When used in conjunction with a high-pressure shrink tank, the liquid-liquid tank can be used to study the viscoelasticity of the oil-water interface.
High pressure shrink groove (ISR groove)
The groove body of the high-pressure compression tank is longer and narrower, with a higher compression ratio. The high-pressure groove is designed for the use of interface shear rheometer (ISR), but it can also be combined with other characterization instruments to make the combined instrument more efficient.
Microscope slot
The size of the microscope slot is the same as that of the standard slot, and the slot is equipped with a sapphire window that allows light with a wavelength greater than 200 nm (applicable to visible or ultraviolet spectra) to pass through. For certain sizes of tanks, an inverted microscope with a glass window can be configured.
Forging belt sliding groove
The forging belt sliding barrier groove can be used for Langmuir or Langmuir Blodgett deposition methods. Compared to floating barriers in conventional systems, this PTFE coated glass fiber ribbon specially designed for pulmonary surfactant research can provide higher packing density (such as molecules like DPPC with surface tension exceeding 70 mN/m).
KSV NIMA characterization instrument
Interface Infrared Reflectance Absorption Spectrometer (PM-IRRAS)
The infrared reflectance absorption spectrometer with polarization module is mainly used to determine the orientation and chemical composition of molecules.
Brewster angle microscope (BAM)
Single molecular layer imaging and optical observation of the uniformity, phase behavior, and morphology of thin films can be performed, and different resolutions and other analytical data options can be provided.
Surface potential measuring instrument (SPOT)
Using vibration disk technology to monitor the potential changes of thin films and characterize the electrical properties of single molecular layers. Providing information such as bulk density and orientation can supplement any Langmuir isotherm test.
Interface Shear Rheometer (ISR)
This shear rheometer can measure the viscoelasticity at the interface. Suitable for the study of gas-liquid or oil-water interfaces, it can analyze viscoelasticity while controlling surface pressure.
KSV NIMA LB software
The KSV NIMA LB software is very intuitive and easy to operate. It provides customers with various pre programs covering classic Langmuir and Langmuir Blodgett membrane experiments. These programs can be modified according to user needs, record a large amount of data and parameters, and perform graphical analysis on relevant data. The parameters that can be recorded include the number of data points, time, obstacle position, obstacle speed, tank area, molecular area, immersion position, immersion speed, number of layers, transfer ratio, cumulative transfer amount, temperature, pH value, and surface potential.
The standard procedure includes:
Compression/relaxation isotherm: a functional relationship between surface pressure and unit average molecular area, residual area, time, or other measurement parameters.
Analyze monolayer dynamics (enzyme kinetics, monolayer hydrolysis, polymerization, or other zero order reactions).
Analyze the permeability, solubility, and binding with biomolecules (enzymes, proteins, peptides, etc.) of a single molecular layer.
Equal volume line and equal pressure line: The increase or decrease of surface pressure/temperature, surface pressure/time, or surface pressure/any parameter that needs to be measured can all be analyzed by plotting.
Shear rheology: Detecting viscoelasticity by vibrating a sliding barrier under a certain surface pressure.
Immersion: Langmuir Blodgett and Langmuir Schefer modules can control and monitor surface pressure, immersion speed, stroke length, deposition process, and transfer ratio.
After completing an experiment, users can perform further data analysis on the data restoration and analysis interface. After selecting an experiment, the corresponding experimental data will also be displayed. Different experimental data can be displayed and compared in the same chart. The software can also calculate other relevant data and output it. For example, if there is information on the latest material properties, data calculations can be redone by viewing and editing experimental settings.
Product advantages
Excellent performance benefits from design
A sensitive surface tension sensor designed specifically for extremely precise testing. Platinum metal plates, platinum metal rods, and cardboard can all be used as probes to meet different needs.
The open design facilitates the placement of the tank on the frame and quick replacement of different tanks, while also facilitating the cleaning of the tank surface.
When cleaning or replacing a new tank, the disassembly and placement of the tank on the frame are extremely convenient.
The Langmuir and Langmuir Blodgett tank bodies are composed of a single piece of pure polytetrafluoroethylene that is easy to clean, reliable, and durable. Their design can prevent leakage from the tank body and coating well, while avoiding potential contamination caused by the use of glue and other packaging materials.
The sliding barrier is made of hydrophilic Dierlin polyoxymethylene resin, which can improve the stability of the monolayer. Hydrophobic PTFE compression barriers can be provided according to customer needs. A sturdy metal frame can prevent the sliding barrier from deforming over time.
The thin frame design can be combined with optical characterization techniques such as PM-IRRAS (infrared spectroscopy), Brewster angle microscopy, fluorescence microscopy, X-ray, etc.
Symmetric sliding barrier compression is a standard uniform compression method, and any instrument can achieve single sliding barrier compression.
The centrally located coating well is beneficial for the uniformity of monolayer LB deposition.
Heat/cool the aluminum substrate through an external circulating water bath to control the temperature of the sub phases (the water bath is sold separately).
By adjusting the frame support feet, the level of the groove can be quickly and accurately calibrated. When it is necessary to place the microscope, the frame support legs can also be easily removed from the groove.
Control your experiment
Powerful and intuitive software can meet the needs of both beginners and experienced users. It is the core component of KSV NIMA L and LB, which can fully control and display in real-time:
• Surface pressure
• Obstacle location
• Obstacle sliding speed
During the sedimentation process (LB), the position of the substrate
• Immersion speed (LB)
• Temperature
• pH (optional)
Surface potential (optional)
The operation buttons and digital display function on the interface unit can help users prepare for measurement without using software. The comprehensive operation manual provides a detailed introduction to setting up instruments and conducting some basic experiments. KSV NIMA also provides a large amount of instrument information and technical support to help users use the instruments more fully.
Your lifelong partner
The replaceable tank body and highly modular design enable flexible switching between different models of KSV NIMA Langmuir and Langmuir Blodgett membrane analyzers without the need to purchase new frameworks. Customers can make adjustments according to the needs of the experimental system. For example, replacing Langmuir troughs with Langmuir Blodgett troughs, or selecting troughs of different sizes.
KSV NIMA Langmuir membrane analyzer built using a large framework and medium-sized Langmuir tank.
Except for alternating coating tanks, all other tanks (directly or upgraded with new tanks) can be used in conjunction with characterization instruments such as KSV NIMA surface potential sensors, Brewster angle microscopes (KSV NIMA BAM and KSV NIMA MicroBAM), and PM-IRRAS.
All instrument designs use durable components, and after more than 20 years of use, some instruments still perform well.
Multiple accessories can be provided, such as horizontal immersion clamps, surface potential meters, pH probes, etc.
flexibility
At KSV NIMA, we understand that the instrument requirements for molecular scale experiments may vary depending on the research direction, and the standard products we provide may not meet your experimental requirements. If you have special experimental requirements, please contact us to seek suitable solutions.
