summary

Specific surface area and pore size distribution are one of the important parameters to characterize the surface physical properties and pore structure of micro/nano powder materials. Static volumetric gas adsorption is a common and reliable method. The JW-BK100 series high-performance physical adsorption instrument can accurately and reliably solve the problems of specific surface area and pore size analysis of powder materials. This series of products is divided into three models: A, B, and C according to different testing functions. Among them, the C-type research grade equipment is equipped with ultra-low pressure 1-torr or 0.1torr pressure sensors, and 10^-8The Pa ultra-low vacuum turbomolecular pump can effectively solve the analysis of ultra micropores in microporous materials such as molecular sieves, catalysts, and activated carbon.

Testing principle:

Under low temperature conditions (such as liquid nitrogen or liquid argon), the pressure of the adsorbate gas is changed in a closed vacuum system. The pressure change before and after the sample adsorbs gas molecules is measured by a high-precision pressure sensor, and the gas adsorption amount is calculated. The isothermal adsorption desorption curve is depicted, and various physical analysis models are applied for specific surface area and porosity analysis.

JW-BK100Series features and advantages

Superior technology

◎ Testing module - core design,The small dead volume space Vd and real-time detection and control of internal temperature Td ensure the scientific and accurate determination of adsorption capacity;

◎ Pressure sensor - core component,High precision capacitive thin film pressure sensor, C-type configuration with 1 torr (optional 0.1 torr) to achieve gas partial pressure P/P in physical adsorption analysis₀Up to 10^-7-10^-8（N₂/77K）；

◎ Saturated vapor pressure P₀——Core design,Real time detection, equipped with an independent P0 test pressure sensor of 133KPa, P0 value is tested point by point, and P/P0 is calculated in real time, making the data more reliable. Alternatively, the atmospheric pressure input method can be used to test the P0 value;

◎ Cold Free Space——He automatic calibration, suitable for any powder or particle material;

◎ Liquid nitrogen surface control——Adopting comprehensive control technologies such as 3L large capacity vacuum glass inner Dewar flask, efficient sealing, small inner section, and software correction, the non-uniform temperature field inside the sample tube is kept relatively constant (isothermal) during the testing process;

◎ Anti pumping flying——Self controlled adjustable multi-channel parallel vacuum system, with precise "step like" automatic control of vacuum pumping speed to prevent sample flying; At the same time, a built-in anti pumping unit is designed to reduce the possibility of ultrafine powder being pumped away, effectively avoiding instrument contamination;

◎ Vacuum degassing——A standardized design that integrates in-situ and ex situ vacuum degassing. During sample analysis, two additional samples can be subjected to ex situ degassing treatment at different temperatures and times; The analysis station can simultaneously perform in-situ degassing treatment on two samples at different temperatures and times;

◎Turbomolecular pump——C-type standard, maximum vacuum up to 10^-8Pa， Provide strong support for the analysis of ultra micropores under ultra-low pressure, with a micropore diameter test of 0.35nm;

◎Micro pore distribution——The HK and SF microporous analysis models are accurately applied, with a pore size deviation of less than 0.02 nm, and have been certified by the China Institute of Metrology in China;

◎NLDFT——Non local density function theoretical aperture analysis software, developed in deep cooperation with Beijing University of Chemical Technology and Suzhou University, has filled the gap and is in line with international standards, covering various microporous materials such as carbon materials and molecular sieves;

Easy to operate, humanized design

Ethernet data collection, guided operation software, one computer can control multiple instruments simultaneously, and can be remotely controlled;

The dynamic display of each adsorption equilibrium process on the testing interface provides a clear understanding of the adsorption characteristics of the sample, monitors the experimental process, helps analyze abnormal phenomena, and displays the internal action process of the instrument through the event bar and indicator lights. It is a unique and valuable humanized design;

Through the testing interface, the pressure and temperature changes inside the manifold can be visually and clearly observed, which is convenient for instrument maintenance and easy to test the current atmospheric pressure requirements;

Test data is automatically saved as source files, supporting offline and simultaneous analysis of multiple documents. It can be copied, and more than ten physical adsorption analysis models such as BET, Langmuir, BJH, t-plots, etc. are available for selection and use;

Preprocessing includes two types: random independent and same position processing, which can be selected and used as needed. It is a miniature movable heating furnace, ≤ 400 ° C ± 1 ° C, capable of implementing 10 stage program control.

Strong upgradability

The BK100 series adopts a unified standard container module and supports upgrading from Type A and Type B to research grade Type C;

The vacuum system serves the analysis station and the degassing station, and can be upgraded to a second set of vacuum system, which can be independently applied to the degassing station and the analysis station. The second vacuum system can also be equipped with a molecular pump (suitable for C-type);

◎ Upgradeable multi-channel intake, with 8 channels of test gas (including backfill gas) and 1 channel of He, making it easy to automatically select adsorption testing for multiple gases;

◎ Support for upgrading the selective adsorption performance analysis of two unique mixed gases at home and abroad, providing a very meaningful analysis method for the field of gas environment purification.

JWGB_BKControl and analysis software

JWGB-BK Software is an intelligent software that implements operation control, data collection, calculation analysis, and report generation on the Windows platform. It communicates with the host through a LAN port and can achieve remote control.

Guided operation software, users can easily enter the next settings interface according to the software's automatic guidance, and multiple testing methods are available for users to flexibly choose from;

Adopting a unique intelligent judgment and control method for adsorption equilibrium pressure, the adsorption and desorption process pressure is optimized in six stages. Under the condition of ensuring sufficient adsorption equilibrium, the testing efficiency is much higher than that of foreign instruments, creating valuable advantages;

A complete physical adsorption calculation model for flexible selection, including:

-Isothermal adsorption desorption curve;

-BET specific surface area (single point, multi-point);

-Langmuir surface area;

-Surface Area (STSA);

-BJH aperture analysis;

-T-plot analysis;

-DR, DA, MP methods;

-HK aperture analysis;

-SF aperture analysis;

-NLDFT aperture distribution;

-What is the pore size, average pore size, and total pore volume;

-Adsorption curve, adsorption heat calculation, etc;

Multi document simultaneous preview, data analysis, and comparison, with powerful functions;