Day 1 :
Keynote Forum
Sujitra Wongkasemjit
Chulalongkorn University, Thailand
Keynote: Improvement of catalysts for preferential oxidation of carbon monoxide
Time : 11:20 to 12:00
Biography:
Sujitra Wongkasemjit has her expertise in advanced material synthesis and passion in improving environment. Her research goal is to support the environmental protection policy. With 30 years of her career, more than 130 publications in international peer review journals, two books and more than 200 international presentations have been achieved. At least 10 research awards were given to her. She has built experiences in both research and teaching in university.
Abstract:
High-purity H2 is necessary for Proton Exchange Membrane (PEM) fuel cells and preferential oxidation of carbon monoxide (CO-PROX) is widely used for this purpose because of its low cost and ability to reduce CO content to less than 10 ppm. During the last decade, several types of catalysts have been investigated to find a proper catalyst for CO-PROX, including its availability and stability. Commercially available precursors were started to prepare various catalyst supports, and both gold (Au) and platinum (Pt) catalysts were extensively studied. It was found that CO conversion reached 100% at 170-220 °C while its selectivity was in a range of 40-60%. Recently, mesoporous ceria, ceria-zirconia and ceria-titania supports, prepared by nanocasting technique, were studied and copper (Cu) was used as catalyst. Interestingly, the 100% CO conversion was also achieved at a lower temperature (130-150 °C) than those obtained from Au and Pt. However, the same selectivity range was observed.
Keynote Forum
Khantong Soontarapa
Chulalongkorn University, Thailand
Keynote: Simultaneous esterification and transesterification of palm fatty acid distillate in chitosan membrane reactor
Time : 12.00-12.40
Biography:
Khantong Soontarapa has her expertise in membrane technology and chemical safety. She is currently an Associate Professor in Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Thailand. She is interested especially in chitosan membrane application for water and wastewater treatment, pervaporation, gas separation membrane, fuel cell membrane and development for health and biomedical applications.
Abstract:
Biodiesel from Palm Fatty Acid Distillate (PFAD) with Free Fatty Acids (FFAs) of 87.1±1.3 wt.% was prepared in this study. Symmetric dense uncross-linked and cross-linked chitosan membranes were provided from the local chitosan membrane manufacturer. The process was comprised of esterification reaction followed by transesterification reaction without intermediate washing in a 2 L chitosan membrane reactor that operating under pervaporation principle. The performance of the internal-pervaporation-assisted was compared with the external-pervaporation-assisted types. In view of membrane performance, it was found that the uncross-linked chitosan membrane was more desirable than the cross-linked one because of its higher hydrophilicity with the same rejection properties of methanol, PFAD and methyl ester. The optimum esterification condition for internal uncross-linked membrane reactor was at PFAD to methanol ratio of 1:15, 2.0 wt.% H2SO4 and 20 ml/min methanol feed rate for 180 min. The esterification product containing FFA and methyl ester of 1.24±0.01 and 90.7±0.1 wt.%, respectively, was obtained. That for the external type was at PFAD to methanol ratio of 1:15, 2.0 wt.% H2SO4 and 20 ml/min methanol feed rate for 120 min. The product from the external type reactor contained FFA and methyl ester of 1.12±0.01 and 93.0±0.2 wt.%, respectively. The transesterification condition was the same in all reactors at 1:6 of PFAD to methanol ratio, 1.0 wt.% NaOH and 20 ml/min methanol feed rate for 60 min. The properties of biodiesel from this study after transesterification were corresponding to Thai standards and/or ASTM D6751-02 except the acid value. The ester content of oil from this study was 96.6±0.0 compared to ³96.5 of Thai Standard. Its acid value was 0.7 compared to £0.5 for Thai Standard and £0.8 for ASTM D6751-02.
- Material Science
Chair
Santhosh Basavarajappa
University of Turku, Finland
Session Introduction
Santhosh Basavarajappa
University of Turku, Finland
Title: Comparison of two finishing and polishing systems on the surface roughness of resin composites using a non-contact profilometer
Biography:
Santhosh Basavarajappa has completed his Master’s degree in the field of Oral and Maxillofacial Surgery and currently pursuing PhD from University of Turku, Finland. He has published around 11 articles in ISI journals with good impact factor.
Abstract:
Surface roughness evaluation of composites has been done using contact profilometer. The aim of this study was to compare the surface roughness of microhybrid, nanohybrid and the nanofilled composite resins with two finishing and polishing systems, using a non-contact profilometer. 45 specimens polymerized for 40 seconds was prepared using a metal mould and divided into three groups: Group-1 was control group, group-2 treated with Swiss flex and group-3 treated with Astropol systems. After final step surface roughness was evaluated using a non-contact profilometer. SEM images of the final finished and polished surface was taken. Data was analyzed using ANOVA and Scheffe post hoc test at 5% significance level. Lowest roughness was seen in controls and highest value when treated under Astropol. Microhybrid presented lowest roughness value and nanohybrid highest roughness value. All materials showed a decreasing surface roughness when finer grit instruments was applied and SEM confirmed the above findings. This in vitro study demonstrated differences in surface roughness of nanohybrid, microhybrid and nanofill composite resins. Two polishing systems resulted in varying surface roughness. Highest surface roughness was seen with nanohybrid composite after polishing with Astropol polishing system.
- Nanomaterials
Chair
Sureshraju Vegiraju
National Central University, Taiwan
Session Introduction
Sureshraju Vegiraju
National Central University, Taiwan
Title: Intra-molecular locked dithio alkylbithiophene-based semiconductors for high performance organic field effect transistors
Biography:
Sureshraju Vegiraju has expertise in synthetic organic chemistry. He has received his PhD in Chemistry at National Central University, Taiwan (2015) on “Synthesis and characterization of fused thiophenes and diketopyrrolopyrroles containing conjugated small molecules”. He is continuing as a Postdoctoral Researcher and he has developed conjugated organic small molecules and polymers for the applications in organic electronics. He has published more than 20 papers in reputed journals.
Abstract:
New 3,3’-dithioalkyl-2,2’-bithiophene (SBT) based small molecular and polymeric semiconductors are synthesized by end-capping or co-polymerization with dithienothiophen-2-yl (DTT) units. Single crystal, molecular orbital computations and optical/electrochemical data indicate that the SBT core is completely planar likely via S(alkyl)∙∙S(thiophene) intra-molecular locks. Therefore, compared to semiconductors based on the conventional 3,3’-dialkyl-2,2’-bithiophene (BT), the resulting SBT systems are planar (torsional angle <1o) and highly π-conjugated. Charge transport characteristics were investigated for solution-sheared films in field-effect transistors demonstrating that SBT can enable good semiconducting materials with whole mobilities ranging from ~0.03 to 1.7 cm2 V-1 s-1. Transport difference within this family was rationalized by film morphology as accessed by grazing incidence X-ray diffraction (GIXRD) experiments.
- Polymer Science
Chair
Sathiyanathan Felix
Anna University, India
Session Introduction
Sathiyanathan Felix
Anna University, India
Title: A novel CuO-NiO/PANI/graphene nanocomposite for high sensitive amperometric glucose sensor
Biography:
Sathiyanathan Felix has received her BSc degree in Physics from Madras University, Chennai, India and the MSc degree in Physics from Thiruvalluvar University, Vellore, India and MPhil degree in Physics from Madras University. She has obtained her PhD degree at the Centre for Nanotechnology Research, VIT, Vellore. She has then joined as an Assistant Professor in the Department of Physics, Dhanalakshmi College of Engineering, Chennai, Tamil Nadu. She is currently a National (SERB) Post-doctoral Research Scholar at the Crystal Growth Centre, Anna University, Chennai, India. Her research interest includes synthesis of nanomaterials like metal oxides, metal organic frame work and graphene-based composites for the development of non-enzymatic bio-sensors.
Abstract:
This is paper explains a highly sensitive, rapid and selective enzyme-less electrochemical glucose sensor based on CuO-NiO/PANI/graphene hybrid nanocomposite modified electrode was constructed. The hybrid material was prepared through facile chemical co-precipitation method and characterized by X-ray Diffraction (XRD), Fourier transform infra-red spectroscopy, UV-Vis spectroscopy, Scanning Electron Microscopy (SEM) and Raman Spectroscopy, X-ray Photoelectron Spectroscopy (XPS) technique was applied for the study of chemical composition of CuO nanosheets and the obtained information demonstrated pure phase CuO nanosheets. The electro-catalytic activity and electron transfer ability of the as-synthesized nanocomposites in the presence of glucose was determined by cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The effective surface area of the modified electrode was determined in the presence of potassium ferri cyanide (K3Fe(CN)6) and potassium chloride (KCl) by CV. The novel nanocomposites were utilized for the fabrication of a sensitive and selective non-enzymatic glucose sensor. The modified GCE expressed high electrochemical activity towards the oxidation of glucose in a 0.1 M NaOH solution. At an applied potential of +0.6 V, it displayed wide linear amperometric response towards glucose from the range and sensitivity of 3400 µA/mMcm2. The proposed sensor as enriched with large surface area, ultra electron-transfer capability and high intrinsic redox couples of Cu2+/Cu3+ ions and it is assisted with several advantages such as low cost, simplicity, good long-term stability, reproducibility and selectivity for the determination of glucose. Moreover, the modified electrode was successfully applied to measure the glucose concentration in human urine and food samples.
- Polymers
Chair
Sung Hoon Ahn
Chosun University, South Korea
Session Introduction
Sung Hoon Ahn
Chosun University, South Korea
Title: Nickel-rich zeolitic imidazolate framework: Novel platform for highly robust multi-functional electro-catalysts
Biography:
Sung Hoon Ahn has completed his BS in Chemical Engineering from Yonsei University, South Korea and has obtained his PhD from the same university. He is working as an Assistant Professor in Chosun University in South Korea and he was a Post-doctoral Fellow of Stanford University and Texas Materials Institute. His research interests are Electrocatalysts: Oxygen Reduction Reaction (ORR), Hydrogen/Oxygen Evolution Reaction (HER & OER) catalysts, Energy Materials: Design, synthesis, characterization, and prototype fabrication, Energy Storage Devices: Post Li-ion batteries, supercapacitors, Nanomaterials: nanoalloys, nanooxides, nanocarbons and nanocomposites.
Abstract:
Here, we report a novel strategy for synthesizing bimetallic Zeolitic Imidazolate Frameworks (ZIFs) with a hierarchical nanostructure. In this approach, pre-designed nickel-rich bimetallic solid precursors are directly converted into bimetallic ZIFs with controlled shapes and sizes. The hierarchical structure of the bimetallic ZIFs strongly deviates from the typical polyhedral-shape of zinc or cobalt based ZIFs (ZIF-8 or ZIF-67). The bimetallic ZIFs can then be directly converted to versatile types of electro-catalysts with catalytic nanocrystals-encapsulating carbon nano-cage nanostructure. Among them, a ternary nickel-cobalt phosphide bulk catalyst, which is grown directly on nickel foam, shows excellent bi-functional catalytic activity and durability toward the oxygen and hydrogen evolution reactions, suggesting its practical application as a robust alkaline water electrolyzer. Simultaneously, a carbon-rich catalyst with metallic NiCo nanocrystals-encapsulated in carbon nano-cage nanostructure is found to exhibit excellent activity toward Oxygen Reduction Reaction (ORR). The high potential of these precious metal-free electro-catalysts is demonstrated by employing them as decoupled air electrodes for rechargeable Zinc-Air Batteries (ZABs). The ZABs with a bmZIFs-NxC ORR electrode and bmZIFs-P as Oxygen Evolution Reaction (OER) electrode exhibit ultra-small charge-discharge over-potentials at 10 mA cm-2 current density, surpassing the performance of the counterpart Pt/C ORR electrode and Ir/C OER electrode.
- Applications of Polymers
Chair
Khantong Soontarapa
Chulalongkorn University, Thailand
Session Introduction
Khantong Soontarapa
Chulalongkorn University, Thailand
Title: Anaerobic co-digestion of pig manure and food waste in combined two stage reactor and in membrane reactor
Biography:
Khantong Soontarapa has her expertise in membrane technology and chemical safety. She is currently an Associate Professor in Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Thailand. She is interested especially in chitosan membrane application for water and wastewater treatment, pervaporation, gas separation membrane, fuel cell membrane and development for health and biomedical applications.
Abstract:
A single reactor, namely a combined two stages reactor, was designed and tested in conducting separately the hydrolysis and acidogenesis and methanogenesis stages of anaerobic digestion process. To enhance the effluent quality, a membrane layer was inserted outwardly into the combined two stage reactor as a unique reactor, calling the membrane reactor. The symmetric dense cross-linked chitosan membrane from local manufacturer was used in the membrane reactor type. The methane production and wastewater treatment efficiencies in anaerobic co-digestion of pig manure and food waste were investigated. The ratios at 100:0, 90:10, 80:20, 70:30 and 0:100 with TS contents of 5%, 10% and 20% were experimented in both reactors for comparison. It was found that the membrane reactor provided better performance than the combined two stage reactor. The mixed waste showed better performances than using only the pure pig manure. The higher TS, the better performances were obtained. The methane portion and yield from membrane reactor at 70:30 and 20% TS were 59.6% and 1.57±0.12 L/d, respectively. The treatment efficiencies in term of COD, TS and VS removal were 87.5±0.9%, 47.1±1.3% and 49.7±1.9%, respectively.