Almost all production stages involve moisture sorption and drying processes, which would affect the physical and chemical stability of the materials.
For food materials, the moisture sorption properties are critical for shelf-life stability. This is especially true for materials like biscuits or crackers which are vulnerable to either temperature or humidity shocks. This study uses the Dynamic Vapour Sorption (DVS) technique to focus on the influence of sample size and morphology on the moisture sorption behavior of food materials including biscuits and crackers.
This free online workshop explores how you can use Vapor Sorption Techniques to characterize construction materials. The in-depth workshop covers Dynamic Vapor Sorption (DVS) and Inverse Gas Chromatography (iGC) technology and their applications.
Organized in partnership with the University of Luxembourg, this session is a vital resource for anyone working in the following fields of research:
-Cement & concrete
-Asphalt & bitumen
-Natural & Synthetic fibres
-Carbon fibre & graphene
-Natural stones
-Wood
Traditional BET surface area measurements are typically performed by volumetric, gas sorption techniques. These methods require exposing the material of interest to very low pressures (10-3 Torr and below) and cryogenic temperatures (77K). These conditions can have deleterious affects on many classes of materials; including pharmaceuticals, foods, cellulose-based samples, and natural ingredients. In particular, low pressures and temperatures can cause structure collapse or phase changes on fragile solids.
Flow-based sorption techniques, like Dynamic Vapor Sorption (DVS) and Inverse Gas Chromatography (IGC) can be performed at atmospheric pressure and room temperature. These techniques can be used to determine BET surface areas at industrially relevant and environmental storage conditions. In addition, these techniques can be performed over a wide range of relative humidity conditions, which allow surface characterization and determination of surface areas at ‘real-world’ conditions.
This educational seminar overviews the BET surface area principle by DVS and IGC. Also, it compares results with volumetric measurements and highlight the application of DVS and IGC surface area measurements on a range of materials.
Accurate and detailed insight into sorption properties and surface energy is essential to sector of consumer product research; but nowhere is this more important than in the food sector.
This free-to-attend online workshop explores two innovative techniques, Dynamic Vapor Sorption (DVS) and Inverse Gas Chromatography (IGC), and how they can provide unparalleled insight in the study of food.
Vapor pressure is defined as the pressure exerted by vapor in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system. It is an important physicochemical property for many applications including human health, environmental protection, vapor phase deposition processes, lubricants operational life and separation processes. In addition, the vapor pressure thermodynamic data can be used to calculate enthalpies of vaporization or sublimation. Therefore, the accurate determination of vapor pressure is fundamental for the development of models simulating the behaviour of chemicals in industrial processes or outdoor environments. There are several methods for measuring vapor pressures, as it is difficult for a single experimental method to cover entire range of vapor pressures from less than 10-15 to 105 Pa.
In this webinar, we discussed the Knudsen effusion method and static method for vapor pressure measurement. The Knudsen effusion method is used for measuring sublimation or evaporation processes below 100 Pa in the temperature range from 293 to 673K. The static method has been developed to extend the measured pressure range up to 105 Pa in the temperature range between 293 and 323K. Also, it is capable of measuring vapor pressures of liquid samples, or crystalline solids.
This webinar covers an in-depth introduction to the Inverse Gas Chromatography – Surface Energy Analyser (iGC-SEA) technique and the concept of surface energy.
It explores the versatility of the iGC-SEA technique and how it can be used in the study of pharmaceuticals, polymers, carbon materials and fibres. The case studies presented highlight the use of the system to measure BET specific surface area, surface energy and surface heterogeneity. Studies also demonstrate the effects of changing conditions of temperature and humidity on materials.
This workshop covers in-depth Dynamic Vapor Sorption (DVS) technology and its applications on studies of materials such as polymers, membranes, porous materials, thin films, and so on.
Polymers are widely used in various fields such as Energy and Environmental, Automotive and Aerospace, Marine and Biomedical amongst many other areas and DVS technique can provide insights into a variety of properties.
Agenda:
-Introduction to Surface Measurement Systems – Nachal Subramanian DVS
-Introduction and Basic Applications – Dr. Sabiyah Ahmed
-Vapour permeability in porous materials (particularly membranes and thin polymer films) – Meishan Guo
-Instrument and Software demonstration – Dr. Sabiyah Ahmed & Meishan Guo
This session will explore well-established vapor sorption techniques of Dynamic Vapor Sorption (DVS) and Inverse Gas Chromatography (IGC). With a focus on applications, the webinar delves into the physicochemical characterization capabilities offered by the DVS and IGC, specific to polymers and films.
In particular to IGC, practical examples and case studies are given that cover a wide range of relevant problems, including surface energetics, wetting behavior, composite adhesion/cohesion phenomena, solubility parameters, and glass transitions.
Related to DVS, examples, and case studies are reviewed that provide insight into moisture sorption properties, drying kinetics, vapor-induced phase changes, and vapor diffusion/permeability studies. Also, the hypenization of the DVS with video microscopy and Raman spectroscopy is discussed including examples on relevant materials.
Abstract:
Water should be considered an integral part of hair’s complex structure due to its considerable influence on fiber properties. However, this water content is not constant and varies with the relative humidity of the environment – and accordingly so do certain hair properties. These changing properties are behind the ability to create temporary so-called “water-set“ hairstyles – but they also represent the origin of eventual style failure. At the same time, consumers worry greatly about the water content of their hair and the potential for “drying out” – where there is a demand for “moisturizing” or “hydrating products” if this perceived situation is realized. The interaction of hair and water can represent a probe into the inner structure and there is a need for a means of accurately measuring hair’s water content.
Speakers:
Prof. Rupert Wimmer (BOKU)
Raphaela Hellmayr (BOKU)
Meishan Guo (SMS)
Dr. Sabiyah Ahmed (SMS)
Agenda:
– Introduction to Surface Measurement Systems (T. Schmid)
– Structure-related Vapor Sorption in Phenomena in Wood (R. Wimmer & R. Hellmayr)
– DVS Technique and Applications (M. Guo)
– iGC-SEA Technique and Applications (S. Ahmed)
– Live Q&A