76Withit PANSUK77Charusluk VIPHAVAKIT78Pannee LEELADEEAppraisal of Corrosion Degree and Structural Properties on Reinforced Concrete Beam using Mill Cut Steel Fiber Concrete(Project 2018)Non-Invasive Blood Glucose Monitoring through Optical Fibre Technology(Project 2019)Noncovalent Functionalization of Graphene Oxide for Photocatalytic Applications(Project 2019)60Corrosion of steel that occurred in the reinforced concrete structures is one of the most important causes accounted for the deterioration and reduction of the loading capacity of concrete structures. This research aims to investigate the flexural behavior of the mild corroded reinforced concrete beam containing mill cut steel fiber under static loads. Twelve beams were cast with the water-to-cement ratio of 0.4 containing mill cut steel fibers with volume contents of 0%, 0.5%, 1.0%, and 1.5% respectively. After that, the corrosion acceleration was conducted to induce mild corrosion by applying the impressed current method. The electric current of 250µA/cm2 was applied for 0, 19, 38 days induced the variety corrosion of 0, 2, 5%, respectively. The relationships between load-deflection and volume contents fibers of beams corroded were analyzed and the experiments noted that the presentation of mill cut steel fibers significantly affected the behavior flexural of the reinforcement concrete beams corroded.A ZnO-coated optical-fibre-based sensor for volatile organic compounds (VOCs) detection is developed in this project. A 125-micron diameter of coreless silica fibre (CSF) connected to single-mode fibre (SMF) at both ends to achieve a structure of SMF-CSF-SMF is proposed to detect VOCs biomarkers for diabetes such as isopropanol (IPA). The coreless fibre region is considered to be a sensing region where the multimode interference occurs. It undergoes surface functionalisation with ZnO nanorods prepared via hydrothermal method for the sensor to be selectively detect VOCs biomarker with electrostatic absorption. The intensity modulation responses of the ZnO coated optical sensor with vapour of IPA are analysed showing a reduction of intensity with the increase of IPA concentration, while the uncoated sensor shows no response. These results suggest that ZnO nanorod functionalisation are able to absorb IPA inside its matrices, allowing light interaction with IPA and therefore higher sensitivity, in terms of intensity modulation.Modification of graphene oxide (GO) with porphyrins; TPP and ZnTPP (TPP = 5,10,15,20-tetraphenyl-H21,H23-porphine) was achieved by facile synthesis through a self-assembly process. Compared to unmodified GO and pristine porphyrins, the GO-porphyrins composites exhibited remarkable photocatalytic enhancement under irradiation using a light emitting diode. Moreover, the GO-TPP composite was shown to be a competent and reusable photocatalyst for selective alcohol oxidation under mild conditions, affording desired products in moderate to excellent yields. (New J. Chem. 2020(44): 8264–8272.) In another sub-project, copper nanoparticles fabricated onto reduced graphene oxide (Cu NPs/rGO) were successfully synthesized via a one-pot dimethylformamide (DMF) reduction approach with an addition of the nominal water. Small particle sizes and high dispersion of Cu NPs on rGO were confirmed by scanning transmission electron microscopy (STEM). In addition, our Cu NPs/rGO was competent to catalyze the Ullmann-coupling
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