No abstract

No abstract

Any flourishing scientific publication must emphasise on describing the structure of knowledge, the development of research themes, and the creation of new topics. Walailak Journal of Science and Technology, a Scopus-indexed top journal is making strides with an average of 180 articles published each year with multi-disciplinary spectrums. The whole objective of the study was to map out the knowledge clusters within the considered timeframe and to help the budding researchers to pick and explore the emerging themes. This study makes use of a bibliometric strategy and knowledge mapping, using CiteSpace and R Biblioshiny to conduct a quantitative and visual analysis of articles published between the years 2016 and 2021. In this particular research endeavour, evaluations concerning authorship, nations, institutions, reference articles, keywords, and reference journals were carried out. Through the review, a total of 626 articles with contributions of a total of 1955 writers were analysed. There is a 16.19% increase in the annual rate of scientific production. Food Chemistry journal is determined to be the most locally cited publication with 163 articles. MN Owaid, Tangpong J, and K Thammasiri have the highest H-Indexes, whereas the top authors are K Thammasiri and N Chuenboonngarm. The most important keywords are antioxidant, Covid-19, and antibacterial action. The highest contributing country is held by Thailand, which has an impressive 843 publications; in second place is Indonesia with 93 publications, and in third place is India with 78 publications. The coronavirus, thai fruits, cymbidium finlaysonianum, fat metabolite, and DNA sequence are the top 5 clusters with good Q and silhouette value.

No abstract

Large scale production of graphene has recently received a great deal of attention because of its interesting properties and wide range of potential applications. Conventional chemical exfoliation approaches, such as Hummer’s method,provides cost-effective pathway for large scale production, however, the method suffers from several key challenges such as the usage of corrosive and toxic solution, high processing temperature, long duration, and the poor quality of graphene produced which severely affects its potential applications. Recently, electrochemical exfoliation of graphene has been proposed for a high production yield with better quality. The electrochemical method involves two steps: 1) intercalation of ionic species between the graphene layers, followed by 2) oxidation of these ionic species under an anodic voltage into gas molecule enabling exfoliation of graphene flakes from the graphite electrode.1 In this study we examine a new approach to the intercalation, using an intercalating ion that has received very little attention and has not been evaluated for electrochemical exfoliation. The intercalation was followed by exfoliation in (NH4)2SO4 solution leading to the production of graphene flakes. The resultant graphene was found to have less disrupted sp2 lattice structure, with a high yield of about 95 % of graphene, along with high electrical conductivity and a low oxidation level (with a C:O ratio of about 15, determined by XPS). In addition, the presence of nitrogen and sulfur moieties in the resulting graphene structure can act as an electrocatalyst2 for applications such as the oxygen reduction reaction. Thus, the as-prepared graphene could be used for a range of electrochemical applications. References: (1) Sharif, F.; Zeraati, A. S.; Ganjeh-Anzabi, P.; Yasri, N.; Perez-Page, M.; Holmes, S. M.; Sundararaj, U.; Trifkovic, M.; Roberts, E. P. L. Synthesis of a High-Temperature Stable Electrochemically Exfoliated Graphene. Carbon 2019. (2) Singh, A.; Yasri, N.; Karan, K.; Roberts, E. P. L. Electrocatalytic Activity of Functionalized Carbon Paper Electrodes and Their Correlation to the Fermi Level Derived from Raman Spectra. ACS Appl. Energy Mater. 2019, acsaem.9b00180.