FlowPrep
The Micromeritics FlowPrep lets you choose the most suitable gas, temperature, and flow rate for your application and sample material.
Overview
Surface area and pore volume are important physical properties that influence the quality and utility of many materials and products. It is critical that these characteristics are precisely determined and controlled. Similarly, an understanding of surface area and pore volume is often key in understanding the formation, structure, and potential application of many natural materials.
The Micromeritics’ Gemini surface area analyzer rapidly and reliably produces accurate and repeatable surface area and pore volume results. Low cost, speed, simplicity of use, reliability, and ruggedness have earned the Gemini a place in laboratories worldwide as an essential tool in research and quality control environments.
Software
Superior data presentation capabilities
Gemini analyzers can be operated from a keypad by way of embedded software or from a computer using the more-powerful and versatile Gemini Windows optional software.
The embedded software includes:
- System verification tests
- Single- and Multipoint BET (Brunauer, Emmett, and Teller) surface area
- Langmuir surface area
- Total pore volume
- Total micropore volume and area by the t-Plot method using Halsey, Harkins-Jura, or Carbon Black STSA thickness curves
- Horvath-Kawazoe for micropore distribution
- BJH pore size distribution using adsorption isotherm (Gemini 2390p and 2390t only)
- BJH adsorption and desorption isotherm, 1000 data points (Gemini 2390t only).
The easy-to-use Gemini Windows 7 interface enhances the capabilities to plan, launch, and control the analysis. You can collect, organize, archive and reduce raw data, and store standardized sample information and analysis conditions for easy access during later applications. Finished reports may be generated to screen, paper, or to files in various formats. Features include cut-and-paste graphics and tables, scalable-and-editable graphs, and customizable report formats. Using computer control, you can operate up to four Gemini analyzers simultaneously from a single computer.
Gemini Windows® Features
Gemini Windows software provides additional features not included with the embedded software. Features such as:
- Installation and how-to videos
- Reduction of user-entered data
- Automatically generated pressure tables with user-selected endpoints
- Storage of all historical sample data for retrieval
- User-defined pressure table
- Summary report
- Sample log
- Isotherm plot overlays
- Autoscaling x- and y-axes
- Cut-and-paste graphics and tables
- Data export to ASCII and spreadsheet formats
- User-defined thickness curve (manually entered or from data file)
- Fixed pore size tables
- Linear and log plots (isotherm, pore volume, pore area)
- Cumulative and differential data
- Broekhoff-de Boer thickness curve
Confirm™ software is available with the Gemini, which addresses the many requirements specified by 21 CFR Part 11 validation, security, audit trails, reporting, and more.
Windows software with all Micromeritics’ gas adsorption instruments contains the following reports:
Isotherm Reports
- tabular
- graphical
- pressure composition isotherm
Isotherm modeling and surface area
- BET
- Langmuir
- Temkin
- Freundlich
Standard isotherm models
- t-plot: micropore volume, micropore area, external surface area
- alpha-s method
- f-ratio method
Classic models for mesopore volume, area, and distribution
- BJH*
- Dollimore-Heal*
Classic models for micropore distribution
- Dubinin-Radushkevich and Astakhov
- Horvath-Kawazoe
- Saito-Foley
- Cheng-Yang
- MP method
Density Functional Theory for pore size modeling
- Slit-shaped pores using N2 , Ar, or CO2
- Cylindrical pores for alkaline exchanged zeolites using N2 or Ar
- Cylindrical pores for hydrogen–or ammonium-exchanged zeolites using N2 or Ar
- Windows-shaped model for pillared clay
Density Functional Theory for surface energy
- Surface area and energy distributions using nitrogen at 77 K
- Surface area and energy distributions using argon at 87 K
* BJH and Dollimore-Heal require the Gemini VII 2390t to take full advantage of pore size reports based upon the desorption isotherm
System configurations
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- Gemini VII 2390a
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The Gemini VII 2390a model is ideal for rapid and accurate surface area determinations by single-point and multipoint BET and Langmuir methods. In addition, it provides standard methods for total micropore volume using the t-plot method. This model features the ability to determine the statistical thickness surface area (STSA) of carbon blacks (refer to ASTM D6556, ISO/DIS 18852.2, or ISO/CD 4652-2/3).
- Gemini VII 2390p
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The Gemini VII 2390p model provides additional precision with the addition of a saturation pressure (Po) tube that allows the system to monitor the saturation pressure of the adsorptive on a continuous basis during an analysis using a dedicated pressure transducer. This design feature permits a rapid measurement of the adsorption isotherm to near-saturation, as well as the determination of pore size distribution.
- Gemini VII 2390t
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The Gemini VII 2390t model has all of the facilities of the 2390p with the addition of a larger dewar and longer sample tubes for extended analysis times. This provides the additional capability to measure the complete adsorption-desorption isotherm and perform pore size distribution measurements by BJH or DH using up to 1000 data points.
