Programme Book - UPM - Universiti Putra Malaysia

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P52 SYNTHESIS AND CHARACTERISATION OF SILICANANOPARTICLES BY A SOL-GEL METHOD (ACID-BASECATALYSED)S. Ismail, N.N. Samsudin, N.A. Yusof*Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPMSerdang, Selangor, MalaysiaCorresponding author: azah@science.upm.edu.mySilica nanoparticles represent an interesting class of materials and they have a greatdemand to be applied in many fields, because of its high thermal and porosity,mechanical stability, physical and chemical properties. It is available in well definedsize and size distribution. Silica nanoparticles can be synthesised in ether base or acidcatalyst using sol-gel method, which tetraethyl orthosilicate (TEOS) was used as aprecursor to silicon dioxide. In the synthesis of silica nanoparticles using acid catalyst,TEOS, deionized water and ethanol were mixed together. Then, a few drops of acid(HCl, H 2 SO 4 ) was added. The mixture was allowed to form a gel. Then, the gel willundergo drying, calcinations and grinding in order to obtain silica nanoparticles.While, for base catalyst, ethanol and TEOS were mixed and after sonicating themixture was centrifuged under high speed. The product in powder form was obtainedby air drying. In addition to the above observations, the effect of temperature, pH, andconcentration and gelation time on particle size was studied. Various sized particles inthe range 116–235nm were synthesized and particle size was examined underSympatec Nanophox. The morphology and surface obtained in agreement with theresult observed for particle size of silica nanoparticle, which was measured bytransmission electron microscopy (TEM). The voltammetry technique, cyclicvoltammetry (CV) was performed to see the redox reaction of potassium ferricyanidewith different size of nanoparticles.67 |16 th Industrial Chemistry Seminar: Chemistry- A Passport to a Brighter Future
P53 VOLTAMMETRIC DETECTION OF MANGANESE(II)MEDIATED BY GRAPHENE OXIDE AND Fe°/MULTI-WALLEDCARBON NANOTUBE COMPOSITE MODIFIED GLASSY CARBONELECTRODEW.S.A.Wan Ahlim, S.Z. Syed Ramli, W.T. Tan*, H.N.LimDepartment of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPMSerdang, Selangor, MalaysiaCorresponding author:wttan@science.upm.edu.myThe reduction of Mn(II) ion in solution were studied at a graphene oxide modifiedglassy carbon electrode (GO/GCE) and nano Fe°/MWCNT modified GCE usingcyclic voltammetry (CV), chronoamperometry (CA) and chronocoulometry (CC). Theglassy carbon electrode was modified by mechanically attaching graphene oxide andnano Fe°/MWCNT at the surface of GCE. Electrode response at both GO/GCE andnano Fe°/MWCNT/GCE modified electrode and unmodified glassy carbon electrodewere obtained for the reduction of Mn (II). The current enhancement shows a value of2.4 times at the graphene modified electrode and 2.0 times for the nano Fe°/MWCNTmodified electrode. At +807 mV vs Ag/AgCl, the reduction peak of Mn (II) appearedlower with peak shift positively when grapheme oxide modified electrode was used ascompared with that of bare GCE. Meanwhile, at -0.5 mVvs Ag/AgCl, the reductionpeak of Mn (II) decreased with peak shifting when Fe°/MWCNT modified GCEelectrode were used. The chemical and physical conditions including supportingelectrolyte, pH, concentration of Mn (II) and scan rate for maximum enhancement atthe modified solid electrodes were optimized.68 |16 th Industrial Chemistry Seminar: Chemistry- A Passport to a Brighter Future
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16 th INDUSTRIAL CHEMISTRY SEMINAR
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Message from the Dean,Faculty of Sc
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Organizing CommitteePatronAdvisorsC
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8.00 am Registration8.30 am Opening
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P53P54P55P56P57P58P59P60VOLTAMMETRI
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Page 22 and 23: P06 PRELIMINARY STUDY ON NEW AMINO
Page 24 and 25: P08 ELECTRODEPOSITION OF POLYPYRROL
Page 26 and 27: P10 CONVERSION OF PALM OIL TO BIODI
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Page 30 and 31: P14 MICROWAVE SYNTHESIS OF MAGNETIC
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Page 34 and 35: P18 GREEN NANOEMULSION FORMULATION
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Page 40 and 41: P24 MOLECULAR DYNAMICS SIMULATION O
Page 42 and 43: P26 THE SYNTHESIS AND EFFECTS OF Ph
Page 44 and 45: P28CHEMICAL CONSTITUENTS OF Artocar
Page 46 and 47: P30 DESIGN AND OPTIMISATION OF NANO
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Page 64 and 65: P48 OXIDATION OF BENZYL ALCOHOL TOB
Page 66 and 67: P50PRELIMINARY STUDIES OF DEEP EUTE
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Page 72 and 73: P56 COARSE-GRAINED MOLECULAR DYNAMI
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Programme Book - UPM - Universiti Putra Malaysia

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