SMS - Model DVS Resolution -Advanced Vapor Gravimetric Sorption Analyzer
The DVS Resolution can precisely deliver combinations of: (1) Humidity with controlled generation using a humidity sensor (2) Organic vapors with controlled generation using a proprietary Speed of Sound sensor The DVS Resolution can be provided in two different factory configurations: Standard or Advanced to cater for most customer needs. Whether is water sorption, organic solvents or co-adsorption advanced studies, the DVS resolution is SMS flagship instrument with unrivalled capabilities,Dynamic Vapor Sorption (DVS) is a gravimetric sorption technique that measures the rate and amount of solvent sorbed and released by a sample, such as a dry powder absorbing or releasing water. The DVS accomplishes this by varying the vapor concentration surrounding the sample and measuring the change in mass that this produces.
The DVS Resolution elevates the capabilities of the technique to new heights, by allowing the use of organic solvents as probe molecules (as well as water).
Relative humidity is generated by precisely mixing dry and saturated gas flows in desired flow ratios which produce expected relative humidity. In a typical experiment a known concentration of water vapor is delivered over a sample placed inside the sample pan connected to the Surface Measurement Systems Ultrabalance™ measuring realtime mass changes caused by sorption or desorption of water molecules. Prior to sorption measurements, the sample can be in-situ preheated/dried at temperatures of up to 200oC.
Additionally, the sample chamber and water vapor generation are at thermal equilibrium in a single temperature enclosure allowing for operation over the entire temperature range (5-85 oC) without risk of condensation.
With the inclusion of the Speed of Sound sensor, the DVS Resolution is capable of measuring organic vapor concentrations, with unrivalled precision. The usage of organic solvents opens the door to a whole new set of applications to further characterise the material, such as:
- Specific Surface area determinations (BET), at ambient conditions of temperature and pressure.
- Amorphous content determination, to contents even below 2%
- Investigation of solvate formations
- Surface Energetics study using polar and non-polar solvents
The DVS Resolution allows for the collection of high-quality data, owing to the outstanding Ultrabalance performance (Figure 4), precise vapor generation (Figure 5) and accurate temperature control (Figures 4, 6, 7).
The Speed of Sound (SoS) sensor in the DVS Resolution is the only method to directly measure the vapor concentration ultrasonically. It determines the gas/vapor concentration in real-time based on the speed of sound travelling through a fixed volume of solvent gas/vapor.
• SoS-based concentration measurements enable active closed-loop control, which is significantly more
accurate than open loop control
• Complex simultaneous generation of 2 different organic solvents can be achieved through the use
of dual SoS sensors technology (DVS Resolution advanced)
• Resolution of ±0.1% P/P0 of target P/P0
Key measuring capabilities:
- Water, organic solvent, and gas sorption and desorption isotherms
- Co-adsorption isotherms using two vapors
- Optional in-situ sample preheating/drying to 200 oC
- Multiple sorption/desorption and sample drying or activation cycles
- Sample masses from 1 mg to 5000 mg
- Surface and bulk measurement capabilities and analyses
Key hardware benefits:
- Only system to measure organic vapor partial pressure directly using Ultrasonic Sensor
- Open stainless steel stand design enabling easy access to sample pan while minimizing static electric charging
- Broad range (5-85 oC) and single uniform and accurate temperature enclosure
- Next generation control and evaluation software for the most advanced experimental design and data analysis
- Optional IR, Raman and Video imaging with integrated control software
Raman Spectroscopy
- Fully integrated hardware/software solution for triggering and capturing Raman spectra during sorption experiments
- Allows for a more complete understanding of vapor-solid interactions for materials
Optional Microscopy and Video
- Optional 5 megapixel color camera
- 200x optical zoom
- Images have time-date-temperature humidity stamps
- Grid overlay and calibration for measuring dimensional change
High Temperature Preheater for Drying, Curing and Vapor Generation at Elevated Temperatures
- In-situ degassing/activation of samples up to 300 oC
- The temperature is measured by Pt100 directly below sample pan
- Humidity generation up to 150 oC
Heated Reservoir accessory
- Special reservoir that replaces the standard bottle, designed for extended humidity generation at high temperatures