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E-mail
qgao@buybm.com
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Phone
18117546256
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Address
408, Building E, No. 26 Zhoukang Road, Pudong New Area, Shanghai
Product Categories
Shanghai Jipu Optoelectronics Co., Ltd
ZETA potential; Particle size; Molecular weight testing system; ELSZneo
NegotiableUpdate on 02/03
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Overview
The advanced models of ELSZ series are not only capable of measuring Zeta potential (Zeta - potential) and particle size in dilute to concentrated solutions, but also devices for molecular weight determination. As a new feature, multi angle measurement is adopted to improve the separation ability of particle size distribution. In addition, it can also measure particle concentration, determine micro rheology, and analyze the network structure of gel. The brand new zeta potential flat plate solid sample cell, with a newly developed coating corresponding to high salt concentration, can be measured in high salt concentration environments such as physiological saline.
Product Details
feature
● Can measure particle size and ZETA potential across a wide concentration range from thin to thick solutions (~40%)
By measuring from multiple angles, it is possible to measure particle size distribution with higher resolution
Can measure the ZETA potential of flat samples at high salt concentrations
The concentration of particles can be measured by static light scattering method
Can measure micro rheology using dynamic light scattering method
● By measuring the scattering intensity and diffusion coefficient of gel samples at multiple points, the network structure and heterogeneity of gel can be analyzed
Can be measured within a wide temperature range of 0~90 ℃
Through the temperature gradient function, the denaturation and phase transition temperatures of proteins can be analyzed
Provide high-precision ZETA potential measurement results by analyzing the measured electrical infiltration flow chart in the sample pool
● Can install fluorescent filters (optional)
purpose
Very suitable for basic and applied research in the fields of interface chemistry, inorganic substances, semiconductors, polymers, biology, pharmaceuticals, and medicine, involving not only small particles but also scientific research on thin films and flat surfaces.
● New functional materials field
- Fuel cell related (carbon nanotubes, fullerenes, functional membranes, catalysts, nano metals)
- Nanobiological related (nanocapsules, dendritic polymers, DDS, nanobiological particles), nanobubbles, etc
Ceramic/coloring materials industry field
- Ceramics (silicon dioxide/aluminum oxide/titanium oxide, etc.)
Surface modification/dispersion/aggregation control of inorganic sol
- Dispersion/aggregation control of pigments (carbon black/organic pigments)
- Slurry like sample
- Filter
Collection and study of capture materials for selected minerals in planktonic systems
● Semiconductor field
Principle analysis of foreign objects adhering to the surface of silicon chips
Study on the interaction between abrasives and additives and the surface of chips
- Interaction of CMP slurry
● Polymer/Chemical Industry
– Dispersion/aggregation control of lotion (coating/adhesive), surface modification of emulsion (pharmaceutical/industrial)
Functional Study of Polyelectrolytes (Polystyrene Sulfonates, Polycarboxylic Acids, etc.)
Research on Process Control and Pulp Additives for Functional Nanoparticle Paper/Pulp Manufacturing
● Pharmaceutical/food industry field
– Dispersion/aggregation control of lotion (food/flavor/medical/cosmetics) and functional detection of protein
Liposome/vesicle dispersion/aggregation control and surfactant (micelle) functional testing
Particle size measurement principle: dynamic light scattering method (photon correlation method)
Due to the Brownian motion of particles in a solution based on their size, they will receive scattered light when exposed to light. Small particles exhibit rapid fluctuations, while large particles exhibit slow fluctuations.
By analyzing this fluctuation using photon correlation method, the particle size and particle size distribution can be obtained.
analysis process
Zeta potential measurement principle: electrophoretic light scattering method (laser Doppler method)
When an electric field is applied to particles in a solution, the electrophoretic movement corresponding to the particle charge can be observed. The ZETA potential and electrophoretic mobility can be obtained from this electrophoresis speed.
The electrophoretic scattering method irradiates light onto moving particles to obtain scattered light, and calculates the electrophoretic velocity based on the Doppler shift of the scattered light.
Therefore, it is also known as the Laser Doppler method.
Advantages of measured electroosmotic flow
When measuring ZETA potential, particles in the sample pool not only swim, but also generate electroosmotic flow. Electroosmotic flow refers to the accumulation of positive ions in a solution near the inner wall of a sample cell when it is negatively charged. When an electric field is applied, positive ions near the wall will move towards the negative ion electrode and create a convection near the center of the sample cell.
The Sen Okamoto formula fully considers the analysis of swimming velocity in the sample pool after considering electroosmotic flow
Application of Electroosmotic Current in Multi component Analysis
The ELSZ Series can confirm the reproducibility of ZETA potential distribution and identify impurity peaks in the measured data by measuring the electrophoretic mobility observed at multiple points within the sample.
Application of Solid Plate Sample Cell
The solid flat plate sample pool is a structure formed by tightly contacting the solid flat plate sample above the box shaped quartz sample pool. The electrophoretic mobility of particles observed at each layer in the height direction of the sample pool was measured. Based on the obtained electroosmotic profile, the surface electroosmotic velocity of the solid can be analyzed, and the ZETA potential of the flat sample surface can be obtained.
Measurement principle of high concentration sample pool
For high concentration samples or colored samples that are not easily penetrated by light, the ELSZ series used in the past is difficult to measure the desired results due to the influence of multiple scattering and absorption. But now, the measurement range of the standard sample cell equipped in the ELSZ series has been expanded to measure dilute solution samples and high concentration solution samples, and the ZETA potential in the high concentration sample field can be measured by using the FST method in the high concentration sample cell.
Principle of Molecular Weight Measurement (Static Light Scattering Method)
The static light scattering method can easily measure absolute molecular weight.
The measurement principle is to irradiate light onto solution molecules to obtain scattered light, and calculate the molecular weight based on the absolute value of the scattered light, which utilizes the phenomenon that large molecules can obtain strong scattered light and small molecules can obtain weak scattered light.
In fact, because the scattered light intensity varies with different concentrations, the light scattering intensity of several solutions with different concentrations was measured and plotted using the following formula. The horizontal axis represents concentration, and the vertical axis represents the reciprocal of the scattering intensity Kc/R (θ). This method is also known as Debye diagram method.
The molecular weight Mw can be calculated by extrapolating the reciprocal to zero concentration (C=0), and the second virial coefficient A2 can be obtained based on this initial gradient
The scattering intensity of molecules with larger molecular weight will vary depending on the angle.
The measurement of molecular weight by measuring the scattering intensity at different scattering angles (θ) can not only improve measurement accuracy, but also obtain the rotational radius of the molecular diffusion index.
When measuring at a fixed angle, as long as the estimated radius of rotation is input, the angle will self correct and higher precision molecular weight can be measured.
The second virial coefficient
Indicating the degree of repulsion and attraction between molecules in the solvent makes it easier to observe the compatibility and crystallization phenomenon of solvent molecules.
When A2 is positive, it represents high solvent compatibility, strong intermolecular repulsion, and greater stability.
When A2 is negative, it represents low solvent compatibility, strong intermolecular attraction, and easy aggregation.
When A2=0, it represents that the solvent is an ideal solvent, and the temperature at this time is called the ideal temperature. The repulsion and attraction are in equilibrium, which is prone to crystallization.
Specifications
measurement items
Zeta potential
● Particle size
● Molecular weight
● Particle concentration
Microrheological measurement
● Analysis of gel network structure
parameter
| Measuring principle | particle size | Dynamic light scattering method (photon correlation method) |
| zeta potential | Electrophoretic light scattering method (laser Doppler method) | |
| molecular weight | Static light scattering method | |
| optical system | particle size | Zero difference optical system |
| zeta potential | Heterodyne optics | |
| molecular weight | Zero difference optical system | |
| light source | High power semiconductor laser | |
| detector | High sensitivity APD | |
| Sample pool unit | ZETA potential: standard pool, trace disposable pool or concentration pool | |
| Particle size/molecular weight: Square pool | ||
| temperature | 0~90 ℃ (with temperature gradient function) | |
| power supply | 220V ± 10% 250VA | |
| Size (WDH) | 330(W)×565(D)×245(H) | |
| weight | 22Kg | |
measurement range
| zeta potential | No effective limitations |
| Electrical mobility | -2×10-5~ 2×10-5cm2/V·s |
| particle size | 0.6nm~10um |
| molecular weight | 340 ～ 2×10*7 |
● Corresponding scope
| Measuring temperature range | 0~90℃ |
| Measurement concentration range | Particle size: 0.00001% (0.1ppm)~40% * 1 |
(Standard particles: 0.00001~10%, bile acids:~40%)
Standard sample pool
Sample pool kit
Sample cell kit for measuring particle size and ZETA potential
Particle size measurement kit
A sample pool kit that can measure particle size and can use the four corner sample slots available on the market
Particle size multi angle sample pool kit
Sample cell kit for measuring particle size and molecular weight from 3 angles
Measurement Example
Multi angle measurement with higher resolution
By measuring and analyzing from three angles: front, side, and back, we provide a particle size distribution with higher resolution.
Samples that cannot be separated by measuring at one angle can also be separated into multiple peaks by measuring and analyzing at three angles.
Particle concentration measurement
The particle concentration in the solution can be calculated using static light scattering method.
Microrheological measurement
Measure the viscoelasticity of soft structures such as polymers and proteins using dynamic light scattering method.
Analysis of gel network structure
The network structure and heterogeneity of gel can be analyzed by measuring the scattering intensity and diffusion coefficient of gel samples at multiple points.
Measurement of Flat Solid Samples under High Salt Concentration
A new sample cell for measuring the ZETA potential on the surface of flat samples. The newly developed high salt concentration coating can be measured in high salt concentration environments (154mM NaCl solution). Realize the evaluation of biocompatible materials.
Zeta potential and particle size measurement with a wide concentration range
The measurable concentration range ranges from 0.00001% (0.1PPM) dilute solution to 40% concentrated solution in terms of particle size and ZETA potential.
Optional accessories
ZETA potential plate cell unit/ZETA potential microplate cell unit
ZETA potential can be measured on the surface of flat and thin film samples at high salt concentrations
● Easy to assemble structure, achieving a screw free structure
Equipped with a simple coating, customers can apply the coating themselves
● Support small-sized samples, 10X10mm
ZETA potential trace throwable cell unit
Cell unit capable of measuring ZETA potential in trace amounts (130uL~)
ZETA potential strong cell unit
Cell Unit for Measuring ZETA Potential of Thick Suspended Samples
ZETA potential low dielectric constant cell unit
Can measure the ZETA potential of non-polar solutions in a cell unit
It can also correspond to solvents with a dielectric constant below 10
Particle size ultra micro glass cell unit
Cell unit capable of measuring particle size in trace amounts (3uL~)
PH titrator (ELSZ-PT)
It can automatically measure the changes in particle size/ZETA potential with different pH values or additive concentrations.
Can be connected to the Zeta potential plate sample Cell.
The working time can be shortened by automatically measuring the isoelectric point.
High sensitivity differential refractometer (DRM-3000)
The necessary parameters dn/dc for measuring and analyzing molecular weight
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