JW-BK Basic Type

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-BK basic series fully automatic surface area and pore size analyzer can accurately and reliably solve the problems of specific surface area and pore size analysis of powder materials. According to different testing functions, it can be divided into three models: JW-BK112, JW-BK122W, and JW-BK222. Among them, the JW-BK122W model is equipped with a small range 10torr pressure sensor and combined with secondary adsorption pump technology, which can effectively analyze the pore size distribution requirements of microporous materials above 0.7nm. Under low temperature conditions (such as liquid nitrogen or liquid argon), in a closed vacuum system, the pressure of the adsorbate gas is changed. 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

Product Overview

Features

Product Features

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.

Secondary adsorption pump technology

The 122W model adopts two-stage adsorption pump technology, which can significantly improve the vacuum degree of the testing system by 1-2 orders of magnitude, providing favorable conditions for micropore analysis. The micropore diameter test is 0.7nm smaller;

Cold Free Space

He automatic calibration, suitable for any powder or particle material

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 simultaneous degassing treatment of two samples at different temperatures and times

Testing module

Core design, small dead volume space Vd, real-time detection and control of internal temperature Td, ensuring the scientific and accurate determination of adsorption capacity;

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

Easy to operate, humanized design

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

DIH Selective Adsorption Model

Pressure sensor

Core component, high-precision capacitive thin film pressure sensor, C-type configuration with 1 torr (optional 0.1 torr) enables gas partial pressure P/P0 in physical adsorption analysis to reach 10-7-10-8（N2/77K）

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 minimize the possibility of ultrafine powder being pumped away, effectively avoiding instrument contamination

NLDFT

The non local density function theoretical aperture analysis software, developed in deep cooperation with Beijing University of Chemical Technology and Suzhou University, fills the gap and is in line with international standards. It covers various microporous materials such as carbon materials and molecular sieves, and dynamically displays each adsorption equilibrium process on the testing interface. It can clearly understand the adsorption characteristics of the sample, monitor the experimental process, help analyze abnormal phenomena, and also display the internal action process of the instrument through the event bar and indicator lights. It is a unique and valuable humanized design;

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

The 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. Design;

Software

software control

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

Typical analysis examples

-The BET repeatability error of the ultra small specific surface area test of iron ore powder is only 0.0015m2/g;

-BET specific surface area, pore size, and pore volume analysis of macroporous materials in white carbon black;

Adopting a unique intelligent judgment and control method for adsorption equilibrium pressure, the pressure of adsorption and desorption processes 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 is available 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;

-BET specific surface area, pore size, and pore volume analysis of macroporous materials in white carbon black;

-NLDFT pore size distribution analysis of activated carbon materials;

Specification

performance parameter