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DEPARTMENT OF PHYSICS CANDIDATURE DEFENCE

Department of Physics, Faculty of Science

University of Malaya

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You are cordially invited to attend Department of Physics MSc and PhD candidature defence:

Date: C2C2 C2C2C2C2C2C2C2C2C2C2C2 24 February 2012 (Friday)

Time: C2C2 C2C2C2C2C2C2C2C2C2C2 9.00 AM - 12.00 PM

Venue: C2C2 C2C2C2C2C2C2C2C2 Auditorium Fizik (AF), Block C, C2Department of Physics, UM.

No.

Speaker

Panels

Title

1.

Ramis Rao A/L Subramanian

(SHC090031)

1. C2C2 Prof. Dr. Abdul Kariem Mohd Arof (supervisor)

2.C2C2 Assoc. Prof. Dr. Ramesh Kasi

3. C2C2 Dr. Zul Hazrin Zainal Abidin

Investigation on the Properties of

Acrylic Polyol Resin Blending with Epoxy Polyol Resin

2.

Noora binti Rosli

(SGR110063)

1. C2C2C2 Dr. Abdurahim Okhunov

2.C2C2C2 Assoc. Prof. Dr. Mayeen Uddin Khandaker

3. C2C2C2 Dr. Ilka Petermann

Low-Lying Excited Energetic Stat es and Structure of Deformed Nuclei

3.

Mohd Lukman bin Inche Ibrahim

(SHC090040)

1. C2C2C2 Assoc. Prof. Dr. Hasan Abu Kassim (super visor)

2.C2C2C2 Assoc. Prof Dr. Mayeen Uddin Khandaker

3. C2C2C2 Dr. Ilka Petermann

Analysis of the Surface Diffuseness of the Nuclear Potential for 48Ti, 54Cr + 208Pb Systems Through Large-Angle Quasi-Elastic Scattering

4.

Zainal Abidin bin Ali

(SGR100014)

1. C2C2C2 Prof. Madya Dr. Rustam Puteh (supervisor)

2.C2C2C2 Prof Madya Dr. Roslan Md Nor

3. C2C2C2 Prof. Dr. Rosiyah Binti Yahya

Thermal Ramping Technique: A Fac ile Nanowires Synthesis Technique for Gas Sensing Applications

5.

Wan Ahliah binti Wan Ismail

(SHC090032)

1. C2C2C2 Assoc. Prof. Dr. Rustam Puteh (supervisor)

2.C2C2C2 Assoc. Prof. Dr. Roslan Md Nor

3. C2C2C2 Prof. Dr. Rosiyah Yahya

Development of Self Cleaning and Antibacterial Coatings by Using Nanoparticles

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ABSTRACTS

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SpeakerC2C2C2C2C2C2C2C2C2 : Ramis Rao A/L Subramanian (SHC090031)

TitleC2C2C2C2C2C2C2 C2C2C2C2C2C2C2C2 : Investigation on the Properties of Acrylic Polyol Resin Blending with Epoxy Polyol Resin

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To improve the inter facial adhesion properties between coating and substrate, the acrylic polyol resin was blended with epoxy polyol resin to produce a hybrid system which is more flexible and though. This study demonstrates correlation between adhesion tests, impact resistance tests, Differential Scanning Calorimetry (DSC), Fourier Transform Infrared (FTIR) studies, Thermogravimetric Analysis and Electrochemical Impedance Spectroscopy (EIS). The hybrid system was prepare d by blending an acrylic polyol resin (A) with epoxy polyol resin (E) in various weight ratios and applying them on pre-treated cold rolled mild steel panel s. The dry film thickness was maintained within the range of 40 mm to 80 mm. The coated panels were allowed to cure under ambient air condition for one week prior to testing. The physical, mechanical, structural, thermal and chemica l properties were investigated to obtain the best formulation. The blending systems consisting of 10 wt% epoxy resin in 90% acrylic resin and 20 wt% ep oxy resin in 80 wt% acrylic resin exhibit good physical and mechanical properti es. FTIR spectroscopy showed crosslinking between components of the binders. DS C showed that the Tg of these binders ranges between 37oC to 75oC. EIS data shows significant differences between samples. Only 90A10E sample exhibits an excellent barrier protective property such a s Rp above 107 E284A6cm-2, Cc below 10-7 F a nd CEB5 in the range of 8-10 up to 30 days of immersion time in 3% of NaCl.C2 This sample also has a lower volume fraction of water due to the prevention of ions, water and oxygen molecules from reaching the substrate by the protective coating. The incorporation of epox y resin gives an improvement in the coating resistance and in the adhesion pe rformance of the acrylic resin. The best performing binder systems was chosen for pai nt formulation using suitable inorganic pigments namelly Silitin Z86, Aktisil AM and Aktisil PF777 with different pigment volume concentration (PVC). The formulated paints demonstrate an interesting correlation between viscosity, contact angle measurement, adhesion, impact resistance, weathering and acid resistance studies, DSC, TGA and EIS. From these studies the critical pigme nt volume concentration (CPVC) was determined at 30%.The developed anti corros ion paint with 30% PVC using organic resin and inorganic pigments shows signifi cant improvement in strength and adhesion properties compared to other PVC ratio s.

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NameC2C2C2C2C2C2C2C2C2C2C2C2 C2 : Noora binti Rosli C2(SGR110063)

TitleC2C2C2C2C2C2C2 C2C2C2C2C2C2C2C2 C2 C2C2C2C2C2C2C2C2C2C2 : Low-L ying Excited Energetic States and Structure of Deformed Nuclei

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The remarkable general properties of even-even rare-earths nuclei are shown. The isotopes of 152-156Sm nuclei are classified as deformed nuclei. Phenomenological models are used to understand the properties of deformed nuclei. The experimental data is anal yzed by theoretical analysis within these models. Major steps in the derivation of cranking model are briefly presented. Harris parameterization f or the energy and angular momentum are formulated and analyzed. The inertial parameters for the even-even deformed nuclei are defined using the Harris parameterization. The angular frequency of rotation is derived from the cubic equation of angular momentu m. The values of angular frequency 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 C2and rotat ional energy 20 are calculated for the isotopes of 152-156Sm nuclei at low spinC2 20 . The energy spectra of positive-parity states which are in good agreement wi th the experimental data are presented. Few new states that are not available in the experimental data are predicted. The parameters fitted to the model are calculated. C2The complete low-energy structures of 152-156Sm isotopes are calcula ted by taking into account the Coriolis mixing between states. At h igher total angular momentum, violation from the adiabatic theory is shown by the increment of energy difference between theoretical and experimental values. It is found that the non-adiabaticity of rotational energy bands occurred at high spin due t o the Coriolis effect.

NameC2C2C2C2C2C2C2 C2C2C2C2C2C2 : Mohd Lukman bin Inche Ibra him (SHC090040)

TitleC2C2C2 C2C2C2C2C2C2C2C2C2C2C2 : Analysis of the Surface Diffuseness of the Nuclear Potential for

48 Ti, 54Cr + 208Pb Systems Through Large-Angle Quasi-Elastic Scattering

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The surface diffuseness parameters of the nuclear potential for 48Ti + 208Pb and 54Cr + 208 Pb systems are studied using the experimental data of large-angle quasi-elasti c scattering. At energies well below the Coulomb barrier, the best fitted diffuseness parameters are 0.40 fm and 0.56 fm for 48Ti + 2 08Pb and 54Cr + 208Pb systems, respectively. When experime ntal data with energies up to 3 MeV below the Coulomb barrier are used, the obta ined best fitted diffuseness parameters are 0.43 fm and 0.63 fm for 48Ti + 208Pb and 54Cr + 208Pb systems, respectively. The results suggest that the standard value of the diffusenes s parameter of around 0.63 fm is not applicable to the 48Ti + 208Pb system, at least at the studied energy regions. The results also show that for each of the studied system, the diffuseness parameter seems to require a hi gher value when the experimental data with energies closer to the Coulomb barrie r are used in the analysis.

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NameC2 C2C2C2C2C2C2C2C2C2C2C2C2 : Zainal Abidin bin Ali (SGR100014)

Title C2C2C2C2C2C2C2C2C2C2C2C2C2 C2C2 : Thermal Ramping Technique: A Facile Nanowires Synthesis Technique for

Gas Sensing Applications

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Carbothermal reduction is an established method to synthesize nanowires due to its capability to vaporize material at lower temperature. Thermal ramping technique utilizes the carbothermal reduction method to successfully synthesize SnO2 nanowires. This technique thermally ramp up the sample to a temperature above the reported values of producing nanowires by the carbothermal reduction to form a thin film on silicon substrates. No carrier gas is required. Nanowires with the smallest diameter of approximately 25 nm were observed. Effect of ramp number, temperature and gold thickness towards structural morphology and densificat ion of the SnO2 nanowires were investigated. Elemental analysis, structural morphology and crystal structure were evaluated using elemental x-ray diffraction (EDX), Field Emission Scanning Electron Microscopy (FESEM ) and x-ray diffraction (XRD) respectively. SnO2 sensors were fabricated from the synthesized SnO2 nanowires and their gas sen sing properties were investigated. Their response towards different operating temperatures (200, 250 and 300 C2B0C) and hydrogen gas concentration (200, 300, 400 ppm and etc) were measured. T hey exhibited tolerable and short response and recovery time. The simplicity an d capability of synthesizing nanowires for the usage in gas sensing devices make it a promising technique for fabricating nanowires sensor.C2

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NameC2 C2C2C2C2C2C2C2C2C2C2C2C2 : Wan Ahliah binti Wan Ismail (SHC090032)

Title C2C2C2C2C2C2C2C2C2C2C2C2C2 C2C2 : Development of Self Cleaning and Antibacterial Coatings by Using

Nanoparticles

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Self-cleanin g and antibacterial surface was developed by incorporating nanoparticles such as silver, Titanium dioxide and Zinc oxide into the sol gel polymer. Coatings was developed using methyl trimethoxy silane as a binder and alcohol as diluent s. Studies on effect of different alcohols as diluent to the optical performan ce of the coating were conducted. Different molarities of silver nitrate were used to prepare silver nanoparticles via precipitation method. The best formulat ion was obtained from the mixture of methyl trimethoxy silane and n-propanol as the diluent. Nanoparticles were added into the best mixture to form the functio nal clear coating. The coating was tested chemical and physically for its properties.


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