HMKTest

AS-3012 BET Surface Area Analyzer and Pore Size Analyzer

SURFACE AREA ANALYZER

AS-3012 BET Surface Area Analyzer and Pore Size Analyzer works on ISO 9277 Determination of the specific surface area of solids by gas adsorption using the BET method, the principle of the popular physical adsorption isotherms, specifically static volumetric method by full computer control without human monitoring.
AS-3012 automatic surface area and pore size analyzer (nitrogen unit system), can analyze two samples and prepare two samples simultaneously, the unit operates in English Windows system, the instrument can perform a single point, multi-point BET surface area, BJH mesoporous, pore distribution, pore size and total pore volume and area, and the average pore size, range of specific surface area from 0.01m ² / g to no limit, range of pore size 0.35-400 nm, it can be used in many applications.

 

SPECIFICATIONS

• Test method: Static volumetric method of vacuum
• Adsorbed gases: Nitrogen
• Range of SSA: 0.01 m²/g to unknown limit
• Range of Pore Size: 0.35-400 nm
• Report: BET SSA/ Adsorption and desorption isotherms/BJH /BJHpore volume analysis/ /total pore volume/total pore area
• Pressure measurement range: 0-120KPa
• Pressure measurement accuracy: ±0.1% FS
• Level control system: Auto coolant applied for specific temperature
• Software control system: INTERNET remote control
• Liquid nitrogen container: 4L
• Container hold time: 48 hrs
• Sample tube material: glass
• Sample tube vol.: 2－10mL
• Vacuum pumping speed: 30L/min
• Vacuum pump: 7X10-²Pa (7X10-4torr)
• Vacuum pump size and weight: D460 x W510 x H785 mm, 70 kg（Host）
• Host power: AC220V/110V 100W
• Power vacuum: AC220V/110v 500W

FEATURES

• Combination of fully-enclosed modules with industrial automation control
  AS-3012 is designed and installed on basis of fully-enclosed modular design. It is divided into modules of control system, vacuum air path system and module of data analysis, acquisition, storage and transmit. Each module contributes to the stability of unit. In case the experimental conditions are ready,operator simply sets the parameters and click Start.The following procedures are automatically done without human control or monitoring. Such way mimimize human disturbance and error rate. At same time it maximize the laboratory work efficiency and test accuracy.
• Imported solenoid valve and sensor work with ingenious control systems
  Programmable control system and imported solenoid valve from Japan contribute to low heat, excellent anti-interference ability, high stability and long working life. Sensor of stepping control system for liquid nitrogen ensures the constant position of liquid level to sample tube, as a result eliminates measurement error due to introduction of dead volume change. High-precision pressure sensor improves the accuracy to the 0.15% of the readings, much better than the 0.15% accuracy full scale (FS) sensors. Unique system for gas inlet and control effectively prevents the splash during sample vacuum and air intake. It also prevents the pipeline from dirty, the matter of the sample from loss and data from deviation due to dramatic pressure change. Integrated cartridge pipeline reduces leakage, dead air space and improve the ultimate vacuum. Special gas closed-system made of stainless steel ensures he tightness of the pipeline and prevents the sample from contamination.
• Powerful software is developed by renowned professionals.
  USB connection between the computer and the unit makes for fast communication. Adoption of multiple theoretical models in the analysis gives users a complete analysis on materials. Automatically saved test data contributes to easy management and query. Result analysis report is automatically printed out after test. In case of power failure, t est can be continued after re-power to save test time.
• Superior design, precise mechanical processing and high quality accessories.
  Outer case is designed in line with the modern requirement and corrosion is prevented by high quality plastic coating. Robust mechanical parts give the unit a stronger bone and hence a longer working life. Selected valves and tubes make for stability and reliability of the unit. Vacuum pump is imported from USA , it gives the users a higher vacuum limit, effective oil return prevention as well as a smooth and safe operation.

APPLICATIONS

• Powder industry
• Adsorbent (zeolite, molecular sieve, activated carbon, silica gel, activated alumina, etc.);
• Catalyst (platinum, palladium and other metal catalysts, etc.);
• Ceramic materials (alumina, zirconia, silicon nitride, silicon carbide, quartz, etc.);
• Battery materials (lithium manganese oxide, graphite, polymer battery materials, alkaline materials, etc.);
• Magnetic powder materials (iron oxide, ferrite, etc.);
• Nano-powder materials (ceramic materials, metal materials, silver, iron, copper, tungsten powder, nickel powder and metal powder);
• Environmental Sciences (sediment, suspended solids, etc.);
• Others (such as ultra-fine fibers, porous fabric, polymer composites, etc.).

PRINCIPLE

The method specified involves the determination of the amount of adsorbate or adsorptive gas required to cover the external and the accessible internal pore surfaces of a solid with a complete monolayer of adsorbate. This monolayer capacity can be calculated fro the adsorption isotherm using the BET equation. Any gas may be used, provided it is physically adsorbed by weak bonds at the surface of the solid (van der Walls forces), and can be desorbed by a decrease in pressure at the same temperature.

Nitrogen at its boiling point (about 77 K) is usually the most suitable adsorptive. If the sensitivity of the instrument when using nitrogen is insufficient for low surface areas, adsorptives of heavier molecules or of vapour pressure lower than nitrogent, e.g. krypton, may be used. The results of measurements with different adsorptives may deviate from each other because of different molecular areas, different accessibilities to pores and different measuring temperatures.

The adsorptive gas is admitted to the sample container which is held at a constant temperature. The amounts adsorbed are measured in equilibrium with the adsorptive gas pressure p and plotted against relative pressure, p/p0, to give an adsorption isotherm. Adsorption isotherms may be obtained by volumetric, gravimetric, calorimetric or spectroscopic measurement or by the carrier gas method using continuous or discontinuous operation.