Keynote Speaker
Dr. Tadashi Arii
Senior Scientist
Thermal Analysis, Product Division, Rigaku Corporation, JAPAN
Dr. Tadashi Arii is a distinguished Senior Scientist specializing in Thermal Analysis within the Product Division at Rigaku Corporation. With a rich academic and research background, Dr. Arii has made significant contributions to the field of thermal conductivity measurement and related areas.
During his tenure as a Guest Researcher at the Department of Physics, Chalmers University of Technology, Sweden (1987-1988), and later at the National Institute for Research in Inorganic Materials (NIRIM) (1989-1990), Dr. Arii immersed himself in pioneering research on thermal conductivity. His work during this period laid the groundwork for his future endeavors in the field.
Dr. Arii earned his Ph.D. in Energy and Environment Science from Nagaoka University of Technology, Japan, in 1997, solidifying his expertise in the domain. Since 2016, he has also served as an adjunct lecturer at the esteemed Tokyo Institute of Technology, where he imparts his knowledge and experience to the next generation of scholars and researchers.
Throughout his illustrious career, Dr. Arii has been the recipient of numerous accolades, underscoring his outstanding contributions to the scientific community. Noteworthy among these honors are the Lecture Award from the Chemical Society of Japan in 1996 and the Research Award from the Mass Spectrometry Society of Japan in 2007. These awards serve as testament to Dr. Arii's exceptional research acumen and dedication to advancing the field of thermal analysis.
Currently, Dr. Arii's research interests lie in the realms of "simultaneous," "hyphenation," and "visualization" techniques based on thermal analysis methodologies. His focus extends to developing innovative approaches for sample-controlled thermal analysis, aimed at investigating a diverse array of materials spanning chemicals, polymers, pharmaceuticals, catalysts, ceramics, and beyond.
Keynote Speech Title:
Study of Thermal Process for Various Materials and Their Applications
by the Latest Unique Thermal Analysis Technologies
Study of Thermal Process for Various Materials and Their Applications
by the Latest Unique Thermal Analysis Technologies
In old thermal analysis publications up to the 1990s, thermal analysis (TA) was defined as "a group of techniques in which a property of the sample is monitored against time or temperature while the temperature of the sample, in a specified atmosphere, is programmed." However, it was subsequently noted that the basic definitions of thermal analysis needed to be changed, and those are the two major items of "programmed temperature" and "sample properties". This trend has opened up new possibilities for thermal analysis and definition, resulting in the definition now being revised by the International Confederation for Thermal Analysis and Calorimetry (ICTAC) has revised the definition to "The study of the relationship between a sample property and its temperature as the sample is heated or cooled in a controlled manner".
Sample controlled thermal analysis (SCTA), where the heating program is governed for changing sample itself, results in a significant number of benefits over conventional thermal analysis. These include enhanced resolution, improved kinetic data and better preparative methods for finely derived and porous solids. The present author has applied the SCTA technique to Thermogravimety, called SCTG, where the sample temperature is altered so as to maintain the rate of mass change at a pre-setting level. This has the effect of reducing both the temperature and pressure gradients in the sample bed and eliminates the uncertainties present in conventional linear heating experiments. Simultaneous thermal analysis, STA has a wide range of applications to understand thermo-physical and chemical changes at a "macro-molecular level". A powerful option for material characterization is the application of hyphenated techniques such as simultaneous measurement systems of STA with mass spectrometry (TG-MS) or with Fourier infrared spectroscopy (TG-FTIR). As a result, we can not only the evolved gas products by thermal decomposition of the materials be analyzed in more detail, but also the strong influence of the self-generated gas atmosphere can be revealed.
The research focuses on the thermo-analytical technique and methodology based on "Simultaneous" and "Combination" with STA and Differential Scanning Calorimetry (DSC), to approach the various material fields and to achieve "visualization analysis". Sample observation analysis that integrates the optical microscope with the thermal analyzers to observe the change in the materials during thermal measurements does not only reveal the visible changes directly in sample shape, size, color and other properties, but also is significantly useful to help the interpretation of an accurate chemical or physical transformation. The thermal changes in the sample status can be displayed in real time and because the optical visual images can be automatically linked with the data from the thermal analyzers as well as the temperatures, the playback analysis can be carried out just by clicking the data curves. By introducing sample observation analysis method, it was visually revealed that the intermediate crystalline phase exists during the crystallization processes from the crystal liquid. To demonstrate the effectiveness of the unique combined and/or visualized thermal analysis methods developed in recent years, application results for several materials will be presented
Invited Speaker
Associate Prof. Dr. Natt Makul
Associate Professor of Construction Materials
Phranakhon Rajabhat University, Thailand
Associate Professor at Phranakhon Rajabhat University. He received his PhD in Civil Engineering from Thammasat University in 2010. His research interests include the microwave heating of cement-based materials, utilization of waste materials as concrete materials (such as fly ash, rice husk ash, limestone powder, steel powder, foundry sand, and dry powder sludge ash), behaviours of Portland cement-based materials, microstructural characteristics of concrete, and special testing and analysis of recycled aggregate concrete structures.
Recycled Aggregate Concrete in Southeast Asia
Concerning the large amount of waste generated and the significant amount of raw materials consumed, circular economy (CE) policies have identified recycled aggregate concrete (RCA) as a key sector for implementing circularity strategies in the production of precast concrete. This is due to the high volume of waste that is produced. Despite this, RCA is not widely utilized in the industrial sector because there need to be more reliable estimates regarding its effectiveness and compatibility with the environment. The primary objective of this research was to provide a set of methodological methods for identifying the best circularity options for RCA products in precast concrete manufacturing based on a multicriteria analysis of their environmental and economic performance. These methods were intended to be used to manufacture precast concrete products. The RCA assessment is conducted using this methodology. In particular, research was done on diversity-grade applications for waste concrete, such as turning it into recycled concrete aggregate (RCA) for use in precast concrete. Multiple scenarios involving using 100% RCA replacements (both as powder and aggregates) were investigated and studied under the particular site characteristics of the Southeast Asian region. The method known as life cycle analysis (LCA) was applied throughout the process of carrying out the environmental and economic research study. The findings of the study revealed the environmental and economic advantages of CE scenarios based on the use of RCA over conventional concrete. This is primarily due to the effects of landfilling and transportation limitations, which were the focus of the majority of the limitations analyzed in the study. The RCA cast directly on the construction site outperformed the RCA cast in stationary precast concrete factories in terms of its performance.