Functions
Adsorption and desorption isotherm
Specific surface area
Inner and outer Specific surface area
Porosity distribution, total pore volume and pore type analysis
Hysteresis loop back study
Mesoporous, microporous and ultramicropore analysis
ISO/BET/LAN/HK/SF/DA/DR/DFT methods
Supporting N2, Ar, CO2 such adsorbate
Supporting liquid nitrogen, oxygen and argon such cold bath
Expandable chemisorptions
Typical application
Carbon Black/White Carbon Black
Tire and rubber manufacturers find that the specific surface area of carbon black has great influences on the service life, friction and rubber performance. Proper carbon black or white carbon black on the specific surface area can be selected according to the tire or rubber purposes.
Nanometer Materials
Surface area and porosity of nanometer materials has decisive influence on their hydrogen storage, oxygen storage and special substance adsorption, such as the typical CNT (carbon nanotube).
Electronic Field
The inner filling materials of capacitor require high specific surface, so as to produce capacitor of smaller volume but larger capacity. Likewise, in the design of ordinary batteries, it is also necessary to consider the material's specific surface area, in order to gain smaller volume and larger storage power.
New energy Battery
New energy battery is the hot field for research currently. It controls the proper stored energy density by controlling the material's specific surface.
Paints and Coatings
Filler surface area of paints and coatings affects the smoothness, texture, color, color saturation, brightness, solid content and film's adhesion property. The porosity can control the application program's performance, such as liquidity, curing time and coating thickness, etc.
Catalyst
Catalyst's active specific surface area and pore structure have great influence on the conversion ratio. Choose the aperture size to filter or transit some substance selectively, so as to create a selective catalyst, and furthermore, produce the desired products.
Automobile Exhaust
Purification of resultants of the automobile exhaust requires special catalyst material. The exhaust purification using transition metal is of important practical significance and economic value. The specific surface and porosity decide the efficiency, service life and economical efficiency of the exhaust conversion device.
Combustion control
In the research and development of rocket propellant and explosive, the combustion rate is controlled by the material's specific surface. If the speed is too high, it may be more dangerous; or if the speed is too low, it may cause failure and inaccuracy.
Active Carbon
Besides an extremely great carrier material, the active carbon is also an ideal filtering material. The filtering effects can be controlled by controlling the active carbon's specific surface and porosity. It has important application in the gas and liquid purification fields.
Pharmaceuticals
The tablet dissolution rate and medical effect action time can be controlled by rationally distributing the effective constituents of the medicines on the filler with certain specific surface area and porosity.
Principle
Surface area and porosity are important physical parameter of porous materials. They are usually measured via physical adsorption. Choosing the proper gas adsorbate and absorb the gas molecules onto the whole surface of the sample detected on the cold bath conditions. Study the surface area and porosity of the material via sensors indirectly.
Mesopore Analysis
On the condition of small partial pressure, only a small amount of gas can touch the sample surface. In this case, the adsorbate molecules move freely on the sample surface. With the increase of adsorbate molecules, a layer of film will be formed on the sample surface. Then the specific surface of the sample can be calculated according to the BET and Langmuir principles.
When the partial pressure increases, multiple layers of adsorption will be formed on the sample surface. Multiple layers of molecule accumulate inside the porosity forms the condensation, named capillary condensation. The aperture can be calculated by BJH, etc, accordingly the aperture distribution diagram can be obtained.
When the adsorption balance pressure tends to be saturate, the pore will be completely filled by adsorbates. In this case, the total aperture and average aperture of the measured material can be calculated, and the complete adsorption isotherm can be worked out.
If adsorption saturated followed immediately by desorption, the partial pressure can be reduced gradually, and the adsorbates can be desorbed slowly from the pore, thus the desorption isotherm can be drawn. We can judge the pore structure and adsorb type via the adsorption, desorption isotherms properties and hysteresis loop.
Micropore Analysis
As the pores of micro porous materials are very small, the potential energy between the pore walls will be greater than that of mess pores or macropores. Therefore, when adsorbing on Micro porous materials, the micro porous surface will be filled quickly, which usually happens on very small partial pressure (< 0.01). Present as isotherm, initial segment of the isotherm of micropore sample will be very steep, and then level off gradually.
The aperture of micropore is close to the molecular diameter. Choosing proper absorbate will bring ideal result.
Intelligent Feeding Technology
FINESORB-3020 analyzer employs an intelligent gas feeding system. The software will automatically choose precise feeding or rough feeding depending on the preset pressure, and intelligently judge the balance state, which avoids gas feeding overshoot or gas feeding waiting for too long. Under desorption, the gas feeding system first withdraws some gas from the system, and then feeds gas to the preset pressure. The system will automatically judge the amount of gas for withdrawing, so as to ensure automatic gas feeding without manual intervention during desorption.
Hardware Superiorities
Hardware
Vacuum System
FINESORB-3020 analyzer employs 2 independent vacuum systems, one for analysis station and the other for degassing station, which allows degassing and analyzing at the same time, and avoids the delay and error caused by using one vacuum system. In addition, the independent systems completely eliminate the effects of gas purity between degassing and analysis.
Intelligent Degassing Station System
The degassing station can choose the proper degassing temperature and degassing time depending on the sample conditions. The degassing processed information can be saved as files for future analysis on the effects of sample degassing conditions for the results, so as to ensure the testing conditions' traceability.
Volumetric Tank and Gas Feeding System
Volumetric tank adopts an integrative design to avoid temperature deviation. Due to its compact structure, the integrated volumetric tank has smaller dead volume, and the measured results are more accurate. Installation and settlement of structural sensor of integrated design are more rational and easy for further expansion. The volumetric tank is demarcated accurately. The volume repeatability error of gas feeding can be ignored
Multi-Gas Support
FINESORB-3020 analyzer supports to use N, Ar, Kr, Co, Co, H and He as adsorbate. The instrument internally supports analysis of multiple data models, so that more types of sample can be analyzed.
Multiple Cold Bath Support
FINESORB-3020 analyzer supports to use liquid nitrogen, liquid oxygen, liquid argon and other cold baths. The instrument internally supports adsorption models under multiple cold bath conditions, which is easy for analyzing multiple types of sample.
Temperature Maintaining System
Dewar flask with longer heat insulation time, sealing soft cover and equipped with heat preserving case, the temperature of the sample pipe can be maintained. The instrument is also optionally equipped with a siphon system which will automatically add liquid nitrogen when the liquid level temperature drops.
High-precision Sensor
The instrument is equipped with a built in high-precision resistance sensor and a Pirani-gauge sensor, which can detect pressure from 1*10-6 Pa to 2*105 Pa, so that the mesopore and micropore adsorption and desorption can be analyzed completely.
Cold Trap Filtering Device
FINESORB-3020 analyzer is equipped with a cold trap filtering device. It uses liquid nitrogen or the mixed solution of liquid nitrogen and isopropanol as cold trap pool, so that the vacuum degree can be enhanced.
Other Accessories
Off-line Degassing Station
This equipment can make preparation for specific surface and pore capacity analysis for multiple sets of sample. Usually the pollutants such as the steam and adsorbed gas are removed from the sample surface or pore by using following gas or vacuum in combination of heating device. The accuracy of the specific surface and pore capacity analysis data largely depends on the clean degree of the sample surface.
The common preprocessing equipments can use inert gases like helium, nitrogen and argon or vacuum atmosphere. Off-line degassing station can support 6 paths of sample degassing.
LN2 Storage and Transmission
Liquid nitrogen requires special containers to store. The common capacity of containers for laboratory use has several sizes ranging from 10 L to 100L. Customers can choose the liquid nitrogen tank with proper capacity according to the laboratory’s use frequency,
Liquid Nitrogen Siphon Equipment
Depending on the laboratory condition, customers can choose manual or automatic siphon equipments to facilitate adding liquid nitrogen from the liquid nitrogen tank to the Dewar flask. This equipment is optional, for concrete choices, please contact 4008261126.
Reference materials
Usually reference materials are required for test to verify the instrument’s performance in china, GBW (E) 130275-GWE (E) 130279 standard substances are used for verifying the specific surface. Internationally, standard substances of NIST are used.
During the actual usage, some substances which have been tested by different authorities will be used for reference, such as white carbon black, molecule sieve, crystal ball and active carbon, etc.
Vacuum Pump
During usage, the instrument requires equipping sliding vane rotary vacuum pump and molecular pump and molecule pump, The vacuum pump performance is directly related to the vacuum pump. During purchase, pump is an item of the list; customers can choose the appropriate pump according to their needs. In addition, different pump models are chosen for degassing station and analysis station. Please call 4008261126
Ultrahigh vacuum
Take the optional micro molecular pump as a secondary pump, which can increase the vacuum system to high vacuum. Equipped with Pirani vacuum gauge, the micropore measurement can be performed or the krypton can be used for specific surface analysis.
Software features
Software Overview
FINESORB-3020 software is based on Windows interface. The software interfaces are simple, clear and easy operation. By using the software, we can set the adsorbate and sample parameters, control the degassing station and analysis station, and control the automatic completion of adsorptions and desorptions. Via the software, we can also view the data after test, generate reports and then print, edit and cut the reports, and export the data to a txt file, which is easy for interaction with the softwares like ORIGIN.
Software Control
The instrument schematic diagram is displayed on the screen, including the valve state and the pressure sensor values, both of which will be shown on the software interface at the same time. The software will automatically judge the operation on the electromagnetic valve according to the preset pressure, and draw isotherm. The software can also support manual control mode, such as the manual operation for the elevator and the electromagnetic valve. The software uses the 485 protocol for control, and supports extended control over multiple instruments.
Report Preview
The software can display the reports generated by different algorithmic models on the screen, and allows editing, copying, printing and exporting them. We can also compare the data and check the repeatability of different results via it.
Data Export
The data in the report can be exported to txt files, easy for interaction with ORIGIN. The graphs in the report can also be copied to the pasteboard, easy for copying to WORD documents for further editing.
Software Controlling Gas Feeding
The software chooses precise gas feeding or rough gas feeding mode automatically depending on the preset pressure, which ensures higher measurement efficiency. The gas feeding mode is intelligent, which can finely tune the gas feeding rate according to the steel cylinder outlet pressure, and prevent pressure overshoot. The intelligent controlled preset pressure option determines a lot the reliability and smooth of isotherm, complied with the mesporous-based samples, can preset pressure on a higher point; and for micropore, must preset on a very low point. Otherwise, samples volumes also influence the preset pressure. While adding samples, we can choose proper preset pressure according to the samples’ specific surface, relative experience please refer “Operation Handbook”.
Software Analyzing Model
According to the isotherm obtained from tests, different test results can be obtained by using different analyzing models. By using BET or Langmuir model, the total specific surface can be calculated; by using t-Plot model, the inner specific surface and outer specific surface can be calculated; by using BJH model, the porosity of mesoporous materials can be calculated; by using HK/SF model, the porosity distribution of microporous materials can be calculated. The research on pore is also being improved, new technologies appears constantly.
Optional Types
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Types
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3020A
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3020B
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3020C
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Process
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BET specific surface
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LAN specific surface
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Mesopore distribution
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Micropore distribution
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Ultra micropore distribution
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Total poro volume
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Isotherm
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Pore types analysis
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Hardware
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Internal degassing station
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Single analysis station
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Double analysis station
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Three analysis station
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Cold trap station
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Automatic lift
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Dewar flask
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Sliding-vane rotary vacuum pump
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Molecule pump
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Resistance type pressure transducer
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Pyrrha vacuum gauge sensor
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Gas
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nitrogen
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Argon
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CO2, etc
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Accessories
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External degassing station
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10L liquid nitrogen container
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Samples warming jacket
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Digital Piezometer
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Principles and Methods
Fully automatic control and fast analyzing of specific surface and porosity
Based on theories of vacuum volumetric method, nitrogen adsorption method, single-layer and multilayer adsorption theories;
Comply with national standard: GB/T 19587-2004
Measurement Scope Specific surface area: 0.1-2000m2 /g
Porosity: 0.35 nm-500 nm
Analyzing Methods
Adsorption/desorption isothermals
Multi-point BET specific surface
Langmuir specific surface
Mesoporous analysis: BJH adsorption and desorptionporosity distribution
Microporous analysis: HK slit pore
Microporous analysis: SF cylindrical pore
Total pore volume
Average aperture
Analysis Efficiency
14-15 minutes (BET)
50-200 minutes (adsorption/desorption isothermals)
Gas and Cold Bath
Support to use gases like N , Ar and Kr for analysis; typical use is N ;
The instrument uses liquid nitrogen as cold bath environment. The liquid nitrogen is stored in the Dewar flask to keep warm;
Instrument Hardware
2-path degassing station, 1-path analysis station;
1-path vacuum cold trap, with cold trap suspension parts;
Two 1.6 L Dewar flasks, preserving heat for 24 hours;
Software controlled elevator, securing stable operation and low noise;
Rotary vane vacuum pump with molecular pump, limit vacuum degree up to 1*10-6Pa
Instrument Software
Graphical operation interface, dynamic display of state of different valves;
Automatically control the test process, support manual control over valve switches and elevator lifting and descending;
Real time display and record of the preset pressure and balance pressure value;
Real time display of the progress of different processes, monitor the process progress;
Tabbed preview of data report, data export, easy for interaction with ORIGIN;
Environment Requirements
Power Supply: AC220V 50-60 Hz
Room Temperature: 10-35℃
Humidity: 10-85% (RH)
Physical Parameters
Height: 870 mm
Width: 850 mm
Depth: 660 mm
Weight: 86 Kg
