jwgbbasic – surface area analyzer

Outline

The JWGB Basic Series can accurately produce surface area and pore size results of powder materials. JWGB Basic Series are divided into three types: Meso 112, Micro 122W, and Meso 222. Equipping with 10 torr high-sensitive pressure sensors and owning secondary adsorption pump technique, Micro 122W can effectively be used to analyze Pore size distribution of materials with pore size above 0.7 nm such as molecular sieve, catalyst, activated carbon, and other porous materials.

Datasheet

Test Module
Internal temperature of test module can be controlled through Real-time monitoring, ensuring accuracy of adsorption detection.

Saturated Vapor Pressure P0
Using independent P0 pressure sensor for P0 value by inching test, guarantees the reliability of experimental data. Atmospheric pressure input method to determine P0 also be selected.

Vacuum System
It’s a multi-channel, adjustable, and parallel vacuum system. Vacuum degree of this system can be controlled in segments.
This design prevents the sample from being pumped into analyzer. Meanwhile, a delicate part was designed for ensuring cleanliness of vacuum system, minimizing dust pollution.

Sample Preparation System
In addition to two pretreatment stations, the other two analysis stations can be used in preparing samples. There is no interference between pretreatment stations and analysis stations. Degas temperature can be set individually and controlled from ambient to 400 ℃.

Micropore Distribution
Accurately apply the HK method, SF method and other micropore analysis model, the aperture deviation of micropore is less than 0.02 nm.

Pressure Sensor
Micro 200C with 1torr (selectable 0.1torr) makes the partial pressure of P/P0 up to 10^-7 - 10^-8 (N₂/77K) in the physical adsorption analysis.

Cold Free Space
Cold free space can be corrected by Helium automatically, ensuring accuracy of test results.
This calibration method is suitable for testing of any powder or particle material.

Control of Liquid Nitrogen level
Using High volume (3L) Dewar flasks and working with the seal cover assure a constant thermal profile along the length of sample tubes and P0 tubes throughout testing process.

Turbo Molecular Pump
Molecular pump is a standard configuration part on the Micro 200C. The ultimate pressure is up to 10^-8 Pa, providing a strong support for micropore analysis in the ultra-low pressure. The smallest micro-pore diameter can be tested is 0.35 nm.

JWGB-BK Software is intelligent software in operation control, data acquisition, calculation and analysis and report generation on the Windows platform. This software can communicate with the host through the LAN port and remotely control many instruments at the same time.

Clear tabular reports include:
  Adsorption and desorption isotherms
  Single-/Multipoint BET surface area
  Langmuir surface area
  STSA-surface area
  pore size distribution according to BJH
  t-plot
  Dubinin-Radushkevich
  Horvath-Kawazoe
  Saito-Foley

JWGB-BK Software adopts a unique intake control method, the pressure in adsorption and desorption process is optimally set in six- stage; this flexible design is helpful for improving test efficiency.

Changes of the pressure and temperature inside the manifold can be observed directly in the test interface which is convenient for sample test and instrument maintenance.
Current state of analyzer can be intuitively understood with the indicator light and event bar.
Each adsorption equilibrium process is dynamically displayed on the test interface. Adsorption characteristics of the sample can be easily understood.

Feature	Meso 112	Meso 222	Meso 122W
Adsorbed Gas	Non corrosive gases, such as N₂, Ar, Kr, H₂, O₂, CO₂, CO, NH₃, CH₄, etc.
Pressure Sensor at Analysis Station	1000 torr	1000 torr, 10 torr	1000 torr,10 torr, 1 torr (0.1torr can be selected)
	Accuracy: ±0.15% (F.S.)
Degas System	Samples at 2 stations can be pretreated simultaneously under vacuum with heating.
Degas Temperature	Ambient to 400 ℃. Free to set up target temperature.
Vacuum Pump	Two-stage rotary vane mechanical vacuum pump, the ultimate pressure is 6.7*10^-2 Pa		Pre-mechanical vacuum pump (ultimate vacuum 6.7*10^-2Pa) and two-stage adsorption pump technique; the vacuum degree of the test system can be improved by one to two orders of magnitude.
Analysis Port	Samples on the 2 analysis bits can be tested alternately.	2 sample tube analysis ports, Parallel test at the same time.	Samples on the 2 analysis bits can be tested alternately.
Test Principle	Gas adsorption by static-volumetric analysis
Measurement Range of Specific Surface Area	0.0005 m²/g to the infinity; Standard sample repeat accuracy is less than ± 1.0%
Test Range of Pore Diameter	0.35 nm-500 nm; pore repeated deviation is less than 0.2 nm in the accurate analysis of porous materials with pore greater than 2 nm		0.35 nm-500 nm; Repeatability of pore size is less than 0.2 nm in the accurate analysis 0.7 nm-2 nm micropore.
Minimum Pore Volume	0.0001 cm³/g
Range of Relative Pressure P/P0	10^-4-0.998	10^-4-0.998 BET	10^-6-0.998
Overall Dimension	Depth:740 mm; width: 500 mm; height: 940 mm; weight:75 kg
Ambient Temperature	15-40 ^oC
Related Humidity	30%-60%
Electrical Supply	AC220 V ± 20 V, 50/60 HZ, maximum power 300W;

Applied Field	Typical Materials	Details
Material Research	ceramic powder, metal powder, nanotube	According to surface area value of nanotube, hydrogen storage capacity can be predicted.
Chemical Engineering	carbon black, amorphous silica, zinc oxide, titanium dioxide	Introduction of carbon black in rubber matrix can improve mechanical properties of rubber products. Surface area of carbon black is one of the important factors affecting the reinforcement performance of rubber products.
New Energy	lithium cobalt, lithium manganate	Increasing surface area of electrode can improve Electrochemical reaction rate and promote iron exchange in negative electrode.
Catalytic Technologies	active alumina oxide, molecular sieve, zeolite	Active surface area and pore structure influence reaction rate.