Ragunathan Al Santiagoo
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Preferred name
Ragunathan Al Santiagoo
Official Name
Ragunathan, Al Santiagoo
Alternative Name
Ragunathan, Santiagoo
Ragunathan, S.
Santiagoo, R.
Main Affiliation
Scopus Author ID
36619090500
Researcher ID
AGS-2453-2022

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The effect of epoxy resin compatibilizer on Polypropylene (PP) / Recycled Acrylonitrile Butadiene Rubber (NBRr) / Banana Skin Powder (BSP) composites

2020 , Ragunathan Al Santiagoo , Gomesh Nair , Husnul Azan Tajarudin , Zawawi Daud , Mustaffa Zainal

Epoxy resin (EP) was use as a compatibilizer on the properties of polypropylene(PP)/recycled acrylonitrile butadiene rubber (NBRr)/banana skin powder (BSP) composites to determine the characterization of composites with and without compatibilization. The objective of this research was to study the mechanical properties and thermal properties of PP/NBRr/BSP composites with and without epoxy resin compatibilizer. The composites were melt using heated two roll mill at 1800C and speed of 15 rpm with 5 different composition (100/0/10, 80/20/10, 70/30/10, 60/40/10 and 40/60/10 weight %). The effects of epoxy resin on mechanical properties and morphological properties were investigated. The results showed that the incorporation of epoxy resin (EP) has improved the tensile properties of PP/NBRr/BSP-EP composite compared with uncompatibilized composite. The Scanning Electron Microscopy (SEM) study of tensile fracture surfaces of the composite indicates improved adhesion of banana skin (BSP) filler with PP/NBRr/BSP matrices in the presence of epoxy resin.

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Utilization of Zeolite-Feldspar as an potential adsorbent for the adsorption of COD and Ammonical Nitrogen in stabilized landfill leachate

2020 , Zawawi Daud , Amir Detho , Nair Gomesh , Husnul Azan Tajarudin , Ragunathan Al Santiagoo , Halizah Awang , Mohd Arif Rosli , Mohd Baharudin Ridzuan

The robust combination of landfill waste recognized as a potential source of hazards. Landfills is one relatively distinctive issue associated with leachate. Generally, zeolite is considered a known adsorbent however relatively very high in cost. Meanwhile, Feldspar is the world’s most common mineral groups which making up as much as about 60 percent of the crust of the earth. Its quality and availability makes the feldspar become relatively low price material. The mixture of feldspar-zeolite are believe to produces effective and inexpensive composite for the treatment of leachate wastewater. The batch experiment was conducted in an Erlenmeyer flask, 250 mL volume with varying the volume of composite mixture ratio and then shaking for 5 hrs with 200 rpm at pH7. The optimum mixing ratio of feldspar-zeolite is chosen 1:1. The optimum removal of COD and ammonical nitrogen is 55% and 50% respectively. The availability of low-cost materials such as feldspar in the composite has helped to minimize the cost of treatment and has helped to increase the potential capacity for adsorption.

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Effect of dye sensitized solar cell fabricated with different thickness of Rutile-Anatase TiOâ‚‚ electrode on the electrical performance

2020 , Nair Gomesh , Ragunathan Al Santiagoo , Song-Quan Ong , Husnul Azan Tajarudin , Zawawi Daud , Syafinar Ramli

DSSC is in the third generation of PV technology which employ easily available raw material with low cost manufacturing methods. Dye- Sensitized Solar Cell (DSSC) consist of a photo electrochemical cell of oxide semiconductor layer, dye molecules, electrolyte and counter electrode. This paper presents the comparison of the thickness of the TiO₂ using Rutile-Anatase composition at 1:4 ratioto the electrical performance of the DSSC. The Dr. Blade method was employed to the fabrication of the DSSC with a reference dyes and platinum sputtered technique counter electrode. The result shows that solar cell with an efficiency of 0.36 % of was produced from electrode film thickness of 10 µm. Further increase in the thickness shows decreased of the efficiency, especially the short circuit current. From the experiment conducted, it shows the 10 µm is suitable size to fabricate the DSSC using the RA-TiO₂ but further investigation is needed to verify the electron transfer efficiency and recombination rate in thicker/thinner films.

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Chemical and fibre properties by Lemon Grass in chemical pulping for pulp industry

2020 , Ragunathan Al Santiagoo , Zawawi Daud , Husnul Azan Tajarudin , Nair Gomesh , Halizah Awang , Mohd Zainuri Mohd Hatta , Mohd Arif Rosli , Amir Detho

Malaysia has a high rate of depleting forest activities than any other tropical countries in the world. This lead to an increasing of pollution and loss of forest trees include animal to our nature. Lemon grasses as a substitute material from non-wood material had been choose for pulp and papermaking industry. This study was going through the chemical composition analysis and fibre properties for lemon grass pulp. These conclude that lemon grass had a high percentage of cellulose; with a low lignin content; good fibre length by TAPPI method. Thus, lemon grass has a potential to be alternative material for becoming waste-wealth product especially for Malaysia’s pulp and papermaking industry.

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Experimental approach for chemical oxygen demand and ammonia nitrogen removal from natural rubber wastewater via adsorption by kaolin

2020 , Zawawi Daud , Ragunathan Al Santiagoo , Husnul Azan Tajarudin , Nair Gomesh , Halizah Awang , Nazlizan Nasir , Mohd Baharudin Ridzuan , Amir Detho

Natural rubber is an important material because of its high strength compared to synthetic rubber. However, the production process of natural rubber discharges a large amount of wastewater containing high concentrations of organic compounds and nitrogen. Therefore, discharging natural rubber processing wastewater without an appropriate treatment can lead to environmental problems such as deterioration of water quality and eutrophication. In this study, the batch adsorption experiment was carried out for the removal of chemical oxygen demand (COD) and ammonia nitrogen from natural rubber wastewater using kaolin as adsorbent. The efficiency of the kaolin was studied by varying the parameters adsorbent dose, pH, shaking speed and contact time. The experimental equilibrium data for this system has been analyzed using the linearized forms of Langmuir and Freundlich isotherms. COD and ammonia nitrogen removal efficiencies were 71.6% and 75.8%, respectively. While, Langmuir isotherm was found to provide the best theoretical correlation of the experimental data.

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Tensile properties of Kenaf core with polypropylene and acrylonitrile butadiene rubber composites

2020 , Ragunathan Al Santiagoo , Gomesh Nair , Husnul Azan Tajarudin , Zawawi Daud , Mustaffa Zainal

The reaction of kenaf core powder (KCP)/polypropylene/acrylonitrile butadiene rubber (NBR) blends with and without a coupling agent, benzoyl chloride is analyzed. The filler loading ranging from 0% to 30% were prepared by using grinding machine and blended with the PP/NBR composites. The increase in only KCP loading in PP/NBR/KCP composites reduced the tensile strength and the elongation at break but increases the tensile modulus. The addition of benzoyl chloride as a coupling agent increased the tensile strength, elongation at break, and modulus of the composites. This investigation proves the enhancement in the adhesion between the filler and polymer matrix. The incorporation of coupling agent also increases the tensile properties of treated composite.

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Electrical performance based on the thickness of electrode using anatase TiOâ‚‚ dye sensitized solar cell

2020 , Nair Gomesh , Zawawi Daud , Husnul Azan Tajarudin , Syafinar Ramli , Ragunathan Al Santiagoo

Solar cell research is an ongoing process to obtain a trade-off between the efficiency to price ratio. In the process to obtain high efficiency at lower cost, the dye sensitized solar cell (DSSC) emerge as the potential candidate. There have been many calls for an alternative method to a solar cell production compared to the current Si-solar cell production. This paper briefly discusses the comparison of using Anatase based titanium dioxide (A-TiO₂) at different thickness to the electrical performance of the DSSC. The Dr. Blade method was employed to the fabrication of the DSSC with a reference dyes and platinum deposition technique which acts as a counter electrode. Overall result shows that the 10µm thickness displays improved performance in the solar cell efficiency as compared to other electrode thickness fabricated and tested. The factors that improves the electrical performance based on the electrode thickness have been discussed in the paper.

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Immobilization of Bacillus sphaericus with palm oil fuel ash for self-healing in the mortar

2020 , Husnul Azan Tajarudin , Ragunathan Al Santiagoo , Nair Gomesh , Zawawi Daud , Megat Azmi Megat Johari , Badorul Hisham Abu Bakar , Rawahah Wahdah Djuanda

Crack in concrete or mortar provides preferential accesses for permeation of liquids and gasses which results in degradation of concrete or mortar and structural failure. Basically, this study has used immobilizedBacillus sphaericus(B.sphaericus) with palm oil fuel ash as self-healing agent in the mortar. The strength of the mortar was improved throughprecipitation of calcium carbonate byB.sphaericuscausing stronger structure due to the binding effect of calcium silicate (C-S-H) gel produced from the pozzolanic reaction. Both self-healing agentswere most likely increased the performance of self-healing in the mortar. In the first phase of this study, the immobilization of both self-healing agentswas studied. This was then followed by embedment of immobilizedB.sphaericuswith POFA into mortar mixture and the effect of different mortar proportion on flow table diameter, compressive strength, microstructural and atomic percentage. It was found that samples containing bio-based self-healing agent recorded the highest compressive strength of 20.95 MPa. The micrograph of SEM and EDX analysis showed that self-healing occurred when secondary C-S-H gel and calcium carbonate present in particular sample. From the result obtained, embedment of the immobilizedB.sphaericuswith POFA into mortar mixture could solve the crack issue.

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