Gemini VII 2390

The Micromeritics’ Gemini VII 2390 Series of surface area analyzers rapidly and reliably produces accurate and repeatable surface area and porosity results. Their 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.

Features and Benefits:

The clear advantage of the Gemini’s capabilities lie in its unique and innovative design which makes for not only a reliable and accurate instrument but also offers an easy to use operating system with intuitive reporting.

• Innovation: Gemini utilizes a unique adaptive rate dosing algorithm and is a special case of the static volumetric technique. Speed and sensitivity are unsurpassed by other static volumetric instruments.
• Accuracy: Micromeritics invented the balance tube design, which negates freespace errors introduced by thermal gradient variations or by initial mismeasurement of free space. The Gemini permits low surface area measurements without requiring krypton and the use of a servo valve controls the rate of gas flow into the sample tube to accurately attain target pressures without pressure overshoot.
• Faster Results: The sample controls the rate at which the gas is delivered thus accelerating delivery of the analysis gas. This results in a surface area analyzer that is as fast as the physics of adsorption allows. How-to videos provide on-screen instruction on instrument operation reducing training time for new users. Easy-to- follow installation videos and system verification tests ensure optimum performance and reliability.
• Flexibility: Three choices of software control:

1. Embedded software allows for operation without an external PC
2. through the keypad Windows 7 or greater operating system
3. Gemini VII Confirm™ 21 CFR Part 11 option for regulated pharmaceutical applications

Three Instrument Options:

• Gemini VII 2390a: Ideal for rapid and accurate surface area determinations by single-point and multipoint BET and Langmuir methods. In addition, provides standard methods for total pore volume, micropore analysis by the t-method, and much more. Included is the capability to determine statistical thickness surface area (STSA) of carbon blacks. (Refer to ASTM D 6556, ASTM D 3765, ISO/DIS 18852.2, or ISO/CD 4652-2/3.)
• Gemini VII 2390p: 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. This design feature permits a rapid measurement of the adsorption isotherm to near-saturation, as well as determination of pore size distribution.
• Gemini VII 2390t: Has all the ability of the 2390p, including a Po tube, with the addition of a larger Dewar and longer sample tubes for extended analyses. This provides the additional capability to measure the total adsorption-desorption process. With this data set, one can perform a BJH or Dollimore-Heal pore size distribution using up to 1000 data points.

Additive Manufacturing

Surface area is a critical tool in investigating the kinetics of the sintering process and product properties. Particles having rough surfaces or internal porosity will generally exhibit higher specific surface areas. Therefore, surface area indicates the amount of sample surface available to react with other component particles and/or the surrounding environment.

 Adsorbents

Knowledge of surface area, total pore volume, and pore size distribution is important for quality control of industrial adsorbents and in the development of separation processes. Surface area and porosity characteristics affect the selectivity of an adsorbent.

 Batteries and Fuel Cells

Optimizing the surface area and porosity of the components improves storage capacity and energy generation.

 Activated Carbons

Surface area and porosity must be optimized within narrow ranges to accomplish gasoline vapor recovery in automobiles, solvent recovery in painting operations, or pollution controls in wastewater management.

 Paints and Coatings

The surface area of a pigment or filler influences the gloss, texture, color, color saturation, brightness, solids content, and film adhesion properties. The porosity of a print media coating is important in offset printing where it affects blistering, ink receptivity, and ink holdout.

 Pharmaceuticals

The surface area of a pigment or filler influences the gloss, texture, color, color saturation, brightness, solids content, and film adhesion properties. The porosity of a print media coating is important in offset printing where it affects blistering, ink receptivity, and ink holdout.

 Catalysts

The active surface area and pore structure of catalysts influence production rates. Limiting the pore size allows only molecules of desired sizes to enter and exit, creating a selective catalyst that will produce primarily the desired product.

 Ceramics

Surface area and porosity affect the curing and bonding of greenware and influence strength, texture, appearance, and density of finished goods. The surface area of glazes and glass frits affects shrinkage, crazing, and crawling.

Carbon Black

The wear lifetime, traction, and performance of tires are related to the surface area of carbon blacks used in their production. Medical Implants Controlling the porosity of artificial bone allows it to imitate real bone that the body will accept and allow tissue to be grown around it.

Nanotubes

Nanotube surface area and micro porosity are used to predict the capacity of a material to store hydrogen.