PRODUCT INFORMATION
characteristic
The latest high-sensitivity APD has been used to improve sensitivity and shorten measurement time
By measuring the automatic temperature gradient space, it is possible to analyze the heat transfer temperature and phase transition temperature
Can measure temperatures over a wide range of 0-90 ℃
Added a wide range of molecular weight measurement and analysis functions
Measurement of Particle Size and ZETA Potential of Suspended High Concentration Samples
Measure the electrical permeation flow inside the cell, analyze the plot, and provide high-precision ZETA potential measurement results
ZETA potential measurement of high salt concentration solution
Flat plate ZETA potential measurement of small area samples
purpose
Suitable for basic and applied research in surface science of membranes and flat samples in the fields of interface chemistry, inorganic materials, semiconductors, polymers, biology, pharmacy, and medicine, in addition to particles.
New functional materials field
Fuel cell related (carbon nanohose, fullerene, functional membrane, catalyst, nanometal)
Bio nano related (nanocapsules, artificial molecules, DDS, bio nanoparticles), nano bubbles, etc
Ceramic and color material industry field
Ceramics (silicon dioxide, aluminum oxide, titanium oxide, etc.)
Surface modification, dispersion, and aggregation control of non-polar colloidal solutions
Dispersion and Agglomeration Control of Pigments (Carbon Black and Organic Pigments)
Suspended turbid sample
color film
Research on the Adsorption of Mineral Collectors in Floating Mineral Selection
Semiconductor field
Identify the structure of foreign objects attached to the silicon wafer
Study on the interaction between grinding or adding material and wafer surface
CMP suspension
Polymer and chemical industry field
Dispersion and aggregation control of emulsion (coatings/adhesives), surface modification of latex (pharmaceutical/industrial)
Research on the functionality of polymer electrolytes (such as polyethylene sulfonate and polycarbonate) and functional nanoparticles
Research on Paper Manufacturing Engineering Control and Pulp Additive Materials for Paper and Pulp Production
Pharmaceutical and food industries
Dispersion and aggregation control of Impulse (food, spices, medical, cosmetics), functional properties of proteins
Dispersion and aggregation control of liposomes and vesicles, functional properties of interfacial active particles (colloidal particles)
principle
Particle size measurement principle: dynamic light scattering method (photon correlation method)
The particles in the solution exhibit Brownian motion that depends on their particle size. Therefore, when light is irradiated onto this particle, the scattered light obtained will float, with small particles floating faster and large particles floating slower.
By using photon correlation method to analyze this fluctuation, the particle size or particle size distribution can be determined.
ZETA potential measurement principle: Electrokinetic light scattering method (laser Doppler method)
By applying an electric field to particles in a solution, the electrical migration of the charge carried by the particles can be observed. Therefore, the ZETA potential and electrokinetic mobility can be calculated from this electrokinetic velocity.
Electrokinetic light scattering method uses light to irradiate particles that undergo electrokinetic motion, and calculates the degree of electrokinetic motion based on the Doppler conversion of the scattered light obtained. Therefore, it is also known as laser Doppler method.
Advantages of Electrical Penetration Flow Measurement
The so-called electrical infiltration flow refers to the phenomenon of solution flow inside the cell caused by ZETA potential measurement. If the cell wall is charged, the counterions in the solution will concentrate on the cell wall.
If there is an electric field, ions will concentrate on the electrode side with opposite signs. In order to fill its flow, there will be a backflow phenomenon near the center of the cell.
Measure the electrophoretic movement speed on the particle surface, analyze the electrical infiltration flow, and determine the correct stationary surface. Of course, this stationary surface includes the influence of cell stains such as adsorption or deposition of the sample, and then calculate the true ZETA potential and electrophoretic movement degree. (Refer to Sen Okamoto's formula)
Sen Okamoto formula
Analysis of Swimming Velocity in Cells Considering Electrical Immersion Flow
Uobs(z)=AU0(z/b)2+⊿U0(z/b)+(1-A)U0+Up
z: Distance from the center of the cell
Uobs (z): Surface mobility at position z in the cell
A=1/[(2/3)-(0.420166/k)]
K=a/b: 2a and 2b are the horizontal and vertical lengths of the cross-section of the electrokinetic cell. However a>b
Up: The true mobility of particles
U0: Average mobility in the upper and lower walls of the cell
Δ U0: The difference in mobility between the upper and lower walls of the cell
Application of multi-component analysis of electrical infiltration flow
Due to the ELSZ serie measuring the surface electrophoretic mobility of multiple points within the cell, the presence of ZETA potential distribution and the determination of noise peak values can be confirmed in the measurement data.
The application of tablet cells
Flat cell refers to densely placing flat samples on top of a box shaped quartz cell to form an integrated structure. According to the depth direction of each level of the cell, measure the electrophoretic mobility of the monitor particle surface
Based on the obtained electrical infiltration profile, analyze the velocity of electrical infiltration flow in the solid interface, and then calculate the ZETA potential on the surface of the flat sample.
Principle of ZETA potential measurement for high concentration samples
Due to the influence of multiple scattering or absorption, it is difficult to measure thick or colored samples that are difficult for light to pass through using ELSZ series.
Now, the standard cells of ELSZseries can correspond to a wide range of sample measurements from low concentration to high concentration. Moreover, by using high concentration cells with FST method *, the ZETA potential of high concentration samples can be measured.
Molecular weight measurement principle: Static light scattering method (photon correlation method)
The static light scattering method is well-known as a simple technique for measuring absolute molecular weight.
The measurement principle refers to irradiating molecules in a solution with light and calculating the molecular weight based on the absolute value of the scattered light obtained. That is, the measurement is based on the phenomenon that the scattered light intensity obtained by large molecules and the scattered light intensity obtained by small molecules are weak.
In fact, the scattered light intensity obtained varies with different concentrations. Therefore, it is necessary to measure the scattering intensity of solutions with different concentrations at several points, and according to the following formula, set the horizontal axis as concentration and the vertical axis as the reciprocal of scattering intensity
Kc/R (θ) is the plot. This is called the Debye plot.
The concentration is zero, the reciprocal of the extrapolated slice (c=0) is used to calculate the molecular weight Mw, and the second virial coefficient A2 is calculated based on the initial slope.
When the molecular weight is a large molecule, the scattering intensity exhibits angle dependence. By measuring the scattering intensity at different scattering angles (θ), it can be seen that the measurement accuracy of molecular weight is improved, as well as the inertia radius of indicators over a large range of molecules.
When measuring with a fixed angle, inputting the calculated inertia radius and making corresponding corrections to the angle dependent measurement can improve the measurement accuracy of molecular weight.
Definition of the coefficient in the second dimension
The interaction between repulsive and attractive forces between molecules in a solvent, as well as the corresponding affinity or crystallization criteria of solvent molecules.
When A2 is positive, it is a high-quality solvent with high affinity, strong intermolecular repulsion, and greater stability.
When A2 is negative, it is a low-quality solvent with low affinity, strong intermolecular attraction, and easy aggregation.
When A2=0, the solvent is called Sita solvent or the temperature is Sita temperature, and the repulsive and attractive forces reach an equilibrium state, making it easy to crystallize.
pattern
ELSZ-2000Z
Measurement principle: Laser Doppler method
High power and high stability semiconductor laser source
High sensitivity APD of photosensitive element
Sample container, standard sample container, trace (130 μ l~) disposable sample container, or high concentration sample container
Temperature range 0~90 ℃ (with gradient function)
Power specification 100V ± 10% 250VA, 50/60 Hz
Size 380 (W) × 600 (D) × 210 (H) mm
Weight approximately 22kg
Measurement Example
Printer Ink Boundary Potential Measurement
Measurement Example Using Flat Sample Containers
Measurement Example of Trace Disposable Sample Container
Analysis of Contact Lens Flat Plate Potential
Analysis of Boundary Potential of Hair Samples
Optional accessories
PH Titimeter System (ELSZ-PT) • Flat Sample Container
• Medium and high concentration sample containers for Jieda potential • Low dielectric constant sample containers for Jieda potential
Trace disposable sample container for Jieda potential
