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Micro 300

INTRODUCTION

The AMI-Micro 300 Series is a high-precision physisorption instrument designed for specific surface area and pore size analysis of various materials. It is equipped with three independently operating analysis ports, allowing different adsorbate gases to be configured and tested simultaneously. Based on functional capabilities, the series is categorized into three models: A, B, and C (see the specification table for additional details). Each analysis station features a dedicated dosing manifold to optimize analysis time and ensure precise gas dosing.
The Micro 300 B and C models are equipped with a 1 torr or 0.1 torr high-sensitivity pressure transducers and a turbo molecular pump with an ultimate pressure of 10^-8 Pa, ensuring precise measurements of microporous structures. Furthermore, all three analysis stations support in-situ sample preparation, minimizing the risk of contamination. This instrument is particularly well-suited for the characterization of microporous materials, including MOFs, molecular sieves, catalysts, activated carbon, and other porous substances.

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- Instrument Structural Layout of AMI-Micro 300 Series

FEATURES

Module Design for Minimal Dead Volume
The internal gas path design of the instrument adopts a unique integrated metal module design, which not only reduces the internal dead volume space but also lowers the system leakage rate.
Saturated Vapor Pressure P₀
An independent P₀ pressure transducer is configured at 133 kPa for P₀ value testing, enabling real-time P/P₀ measurement for more accurate and reliable test data. Alternatively, an atmospheric pressure input method can be used to determine P₀.
Independent analysis ports
With independent analysis ports, the system employs a unique vacuum control logic that allows each station to operate without disruption, even when using a single mechanical pump or pump group. This enables simultaneous, independent experiments, meeting diverse adsorbent testing needs while ensuring high efficiency.
High-Precision Micropore Distribution Analysis
Utilizes advanced micropore models, including the Horvath-Kawazoe (HK) and Saito-Foley (SF) methods, to accurately determine pore size distribution. Ensures an aperture deviation of less than 0.02 nm, providing precise characterization of microporous materials in gas
adsorption studies.
Thermal Stabilization
A core rod in the sample tube reduces dead volume and stabilizes the cold free space coefficient, while an iso-thermal jacket maintains a constant thermal profile along the tube.
Additionally, automatic helium correction ensures precise calibration for any powder or particulate material, minimizing temperature- related deviations during analysis.

Customizable Selection of Pressure Transducers
Depending on the model, the AMI-Micro 300 Series offers various quantities and types of pressure transducers. Among them, the Micro 300C, equipped with a 1 Torr transducer (selectable 0.1 Torr), enables a partial pressure (P/P₀) of up to 10^-7 – 10^-8 (N₂/77 K) in physical adsorption analysis.
Optimized ManifoldContamination Control
This system features a multi-channel, adjustable, and parallel vacuum design with segmented vacuum control. This setup effectively prevents samples from being drawn up into the analyzer therefore preventing manifold contamination.
Turbo Molecular Pump
A Turbo Molecular pump is included on the Micro 300B and Micro 300C. Achieving ultimate pressures of 10^-8 Pa, this system ensures a solid foundation for precise micropore analysis at ultra-low pressures.
In-situ Degassing Ports
Equipped with three in-situ degassing ports, enabling simultaneous degassing and analysis. Each port offers independent temperature control from ambient to 400°C, ensuring precise sample preparation. In-situ degassing enhances microporous material analysis by providing superior efficiency over ex-situ methods.

SOFTWARE

PAS Software is an intelligent solution for operation control, data acquisition, calculation, analysis, and report generation on the Windows platform. It communicates with the host via the LAN port and can remotely control multiple instruments simultaneously.

PAS Software adopts a unique intake control method, optimizing pressure in the adsorption and desorption processes through a six-stage setting, which improves testing efficiency.
Changes in pressure and temperature inside the manifold can be directly observed in the test interface, providing convenience for sample testing and instrument maintenance. The 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.
A clear and concise report setting interface, including the following:
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

TYPICAL ANALYSIS RESULTS

The specific surface area test results for iron ore powder are shown in the figure below. As a material with an inherently low specific surface area, the repeatability error in the measurements is only 0.0015 m²/g, demonstrating high testing precision.

Analysis of pore size distribution of activated carbon materials by NLDFT.

Analysis of pore size distribution of activated carbon materials by NLDFT.

SPECIFICATIONS

Specific Model		AMI-Micro 300 Series
Specific Model		300A	300B	300C
Analysis Ports		3	3	3
P0 Transducer		3	3	3
Analysis Pressure Transducer		3	5	9
Accuracy PTs	Port 1	1000 torr	1000torr, 10 torr, 1(0.1) torr	1000 torr,10 torr,1(0.1) torr
	Port 2	1000 torr	1000 torr	1000 torr,10 torr,1(0.1) torr
	Port 3	1000 torr	1000 torr	1000 torr,10 torr,1(0.1) torr
Adsorbates		N₂, Ar, Kr, H₂, O₂, CO₂, CO, NH₃, CH₄, etc.
Pump		1 Mechanical Pump (ultimate vacuum 10^-2Pa)	1 Mechanical Pump(ultimate vacuum10^-2 Pa); 1 Turbo Molecular Pump (ultimate vacuum10^-8 Pa);
Cold Trap		1
P/P₀>		10^-4-0.998	10^-8-0.998
Surface Area		≥0.0005 m₂/g,testrepeatability:RSD≤1.0%
Pore Size		0.35-500 nm, test repeatability: ≤0.02 nm
Pore Volume		≥ 0.0001 cm³/g
Degassing Ports		3in-situ
Volumeand Weight		L34.5 in (870 mm) × W 22.5 in (570 mm) × H35.0 in (890 mm),176-198 lbs. (80-90 kg)
Power Requirements		110V or 200-240 VAC,50/60 Hz, maximum power 300 W

APPLICATIONS

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.

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