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Case Study 601: Identification of batch-to-batch variations in the dissolution rate of a pharmaceutical drug
Case Study 602: Investigation of the acid-base properties an MCM-supported Ruthenium oxide catalyst by inverse gas chromatography and dynamic gravimetric vapour sorption by inverse gas chromatography
Case Study 603: Correlating drug-binder adhesive strengths measured using inverse gas chromatography with tablet performance
Case Study 604: Determination of carbon fiber-polymer interactions by inverse gas chromatography
Case Study 605: The effect of primary particle surface energy on agglomeration rate in fluidised bed wet granulation
Case Study 606: The effect of primary particle surface energy on agglomeration rate in
Case Study 607: Surface energy and water sorption characterisation of fuel cell components at different relative humidity conditions
Case Study 608: Characterizing disorder in pharmaceutical materials by vapor sorption techniques
Case Study 609: Comparing surface energy/thermodynamics adhesion values with mechanical performance in nano composites
Case Study 610: Correlating mixing properties of model excipient-API blends to spreading coefficients determined via inverse gas chromatography
Case Study 611: Use of surface energy distributions to relate the effect of surface modification to powder flow properties
Case Study 612: Correlating surface energy heterogeneity measured by inverse gas chromatography
Case Study 613: Surface energy distributions and the dissolution rate of aspirin
Case Study 614: Effect of processing route on the physical properties of amorphous indomethacin
Case Study 615: In-situ monitoring of a moisture-induced polymorphic transition using Raman Spectroscopy and gravimetric vapor sorption
Case Study 616: Determination of surface properties of human hair by inverse gas chromatography and dynamic vapor sorption
Case Study 617: Evaluation of protein hydration by inverse gas chromatography and dynamic vapor sorption
Case Study 618: Characterization of structural and stereo isomeric amino acids using Raman spectroscopy and vapor sorption technique
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Mijndert van der Spek is an Associate Professor at Heriot-Watt University with a track record in process design and optimization of CO2 capture, utilisation, and storage, and direct air capture technologies and systems, using process simulation, techno-economic assessment and advanced uncertainty analysis to inform decision making on the feasibility of technologies and processes. Mijndert has a keen interest in adsorption-based CO2 capture, notably from the air. He is the principal or co-investigator on several UK and EU funded research projects, the vice-chair of the EU networking Action TrANsMIT, Associate Editor for the journal Frontiers in Climate and member of the IEAGHG Cost Network where he led activities on new guidelines for technoeconomic assessment.
Ahmed is a Senior Lecturer of Thermal-Fluid Sciences in Mechanical Engineering and Principal Investigator of the Energy and Bioproducts Research Institute (EBRI) and Materials Research (AIMR) groups at Aston University. His PhD in adsorption cooling systems was awarded in December 2012. He has extensive first-hand research experience in thermal systems modelling and optimisation. He developed several adsorption systems modelling approaches, which other researchers have widely adopted. Ahmed published several impactful journal papers. His current research areas encompass the development of advanced sorption composites for sorption heat storage, cooling and water desalination applications. According to the google scholar metric, Ahmed’s research has an h-Index of 13 and a citation score of 832, the majority about sorption technology for the previously mentioned applications.
Ahmed was involved in other research activities, including engine and powertrain modelling and optimisation; turbomachinery 3D Computational Fluid Dynamic (CFD) modelling. He also is the director of the MSc Future Vehicle Technologies course at Aston University.
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2125 28th Street SW, Suite 1, Allentown, PA 18103
Last Edited on April 27, 2018
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The measurement of water activity (Aw) is a very important metric in the food industry. It is used by food manufacturers and government agencies to evaluate the quality of food ingredients and to predict a product’s potential shelf life. The most widely used method to determine Aw is the measurement of water vapour pressure emanating from a food material enclosed in a sealed chamber. This application note demonstrates a possible alternative to the traditional method employed by industry and describes advantages that may be gained by this new procedure.
To continue reading download the full application note using the form below.
Biomass, such as wheat straw is an abundant and inexpensive natural biopolymer rich in cellulose and hemicellulose  which can be converted into bio-fuel. The bio-fuel has been attracting attention due to the future potential shortages of fossil fuel [2,3]. One of the crucial steps of producing bio-ethanol from wheat straw is its pre-treatment which should facilitate the economic feasibility and yield efficient conversion into biofuel. This pre-treatment is expected to increase the accessible chemical sites of the straw to increase convertibility in subsequent hydrolysis and fermentation steps. Dynamic Vapour Sorption (DVS)  and UV were used to assess the wheat straw pre-treatment and sugar yield, respectively.
Raman spectroscopy is a widely used physical characterization technique used in the pharmaceutical industry. The combination of Raman spectroscopy and Dynamic Vapour Sorption (DVS) allows for a more complete understanding of vapour-solid interactions for pharmaceutical materials as it relates to structural properties. This paper overviews the DVS-Raman capabilities and gives several examples.
DVS is now established as a useful analytical tool in many R&D laboratories throughout the world. This application note describes the integration of DVS with a colour video microscope for the in-situ visualisation of moisture induced morphological transformations, which may be correlated with the gravimetric data.
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Validation of humidity generation and measurement in gravimetric vapour sorption instrumentation is an important issue for the pharmaceutical and related industries. This application note sets out a standard DVS method for validation of relative humidity data using saturated salt solutions.
This application note gives a brief description of the technique, the instrument and some examples of its
application within pharmaceutical physico-chemical analysis.
The surface properties of powders and fibres are important parameters in the handling and performance of a wide range of solid materials. iGC SEA has been specifically designed to address many of the issues faced by physical properties researchers, including fully automated operation and the ability to measure samples in a controlled humidity environment. This Application note gives a brief description of the technique, the instrument and some examples of its application to a range of polymeric materials analysis problems.
Dynamic Vapour Sorption (DVS) has long been used for investigating the interaction of water and organic vapours with solid materials. The versatility and impact of DVS has particular importance in the study of building materials. This overview application note summarises several examples of using DVS to study cements, wood, insulation, and other building materials.
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The Dynamic Vapour Sorption(DVS) provides potential benefit over the COST 90 procedure. This application note compares DVS Results to COST 90 procedure.
In the present paper dispersive surface energies and specific free energies have been calculated for different modified E-glass fibre surfaces. Both different sizing and different polymer coatings have been investigated to consider changes in the surface chemistry and surface energy during different fibre treatments.
Finite concentration IGC SEA is a useful tool for the investigation of surface and pore properties. A novel combination of finite concentration IGC SEA and thermal desorption provides the possibility to separate micropore adsorption from surface and mesopore adsorption. This allows the calculation of BET values with physical relevance for highly microporous materials and the consideration of molecular sieve effects.
The glass transition temperature Tg is an important property for the characterisation of polymeric, food, pharmaceutical and many natural products. iGC SEA can provide a fast and accurate determination of this property as well as its dependence on relative humidity. This paper describes the characterisation of maltose with decane at infinite dilution.
The surface energy is a useful parameter describing the energetic properties of the surface of a solid sample. It can be determined in a fast and accurate way by IGC SEA. This paper describes the measurement of the dispersive component of the surface energy of Paracetamol.
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