Noorsuhana Mohd Yusof

Nanoemulsion Applications in Enhanced Oil Recovery and Wellbore Cleaning: An Overview

This article is an overview of potential applications of nanoemulsion as a promising candidates for enhanced oil recovery (EOR) and as a medium for wellbore cleaning. Nanoemulsion is an emulsion that has nanosize particle distributions in the range of below 500 nm. It also has lower interfacial tension (IFT) as low as the value of 0.001 mN/m. The small particle size distributions in nanoemulsion resulted the good properties of nanoemulsion in term of large surface area. This excellent property will improve the sweeping efficiency of the oil droplet in the reservoir and finally increase the oil recovery. Besides that, the unique features possess by nanoemulsion make it suitable as superior wellbore cleaner as compared to conventional detergent-based cleaner. Thus, the significance of nanoemulsion becomes the major highlight in oil and gas industry. This overview on nanoemulsion applications is imperative and necessary in order to provide an insight for the future development and perhaps open a door to extend the applications of nanoemulsion to other more challenging areas.

Effect of Coating Adhesion on Turmeric Essential Oil Incorporated into Chitosan-Based Edible Coating

The main objective of this paper is to study the coating adhesion of edible coating incorporated with active ingredients from turmeric essential oil on cherry tomatoes. The effects of different concentrations (20, 10, 5, 2.5, 1.25, and 0.75 μL) of turmeric essential oil into chitosan-based edible coating were evaluated. The sessile drop technique was applied to measure the contact angles on the surface of the tomatoes. The critical surface tension of the tomato was 18.36 mN/m, and its polar and dispersive component was 3.55 mN/m and 27.31 mN/m. The surface tension of the tomato was found to be 30.86 mN/m. All these surface tension were obtained from the Zisman plot method.

Deposition Behavior of Titanium Dioxide Nanoparticles During Electrophoretic Deposition: Effect on Particle Size

The purpose of this research are to investigate the deposition behavior of different sized nanoparticle using pulse DC in EPD and to study the effect of particle size reduction on crack formation of TiO2 deposited layer. EPD is one of the electrokinetics phenomenons acted as the motion of charged particles in a liquid medium under the influence of an electric field and the deposition on the surface of a substrate with an opposite charge (Naim et al. in Colloids Surf A 360:13–19, 2010 [1]). EPD can be prepared in aqueous or non-aqueous solutions. Four different sizes of TiO2 nanoparticle suspension were used in order to observe the effect of particles size on deposition. The zeta potential was measured with Zetasizer-NanoSeries, Malvern. Increasing the suspensions concentration influence the zeta potential values to change as well. The deposited layer upon drying was observed by FESEM.

Solubility Determination of Tamarind Seeds Extracts by Using Supercritical CO2 Extraction

In recent years, tamarind seeds extracts are used widely in food, pharmaceutical and textile industry due to unique functions as cooking oil, antibacterial and thickening agent. In this study, a simple static technique is used to obtain the solubility of tamarind seed in supercritical carbon dioxide because there is no study on that yet. The solubility measured is performed at temperatures and pressures ranging from 40oC, 60oC, 80oC and 3000psi, 5000psi and 7000psi respectively; resulting in mass fractions in the 6.00 x 10-8 to 5.84 x 10-7 range. The Chrastil model is used to correlate the experimental data. The oil yield extract in range of 0.0375 to 0.365g.

Kinetic Mechanism on Synthesis of Copper Nanoparticle from Reduction Reaction - Effect of Temperature

Copper nanoparticles, due to their interesting properties, low cost preparation and many potential applications in catalysis, cooling fluid or conductive inks, have attracted a lot of interest in recent years. In this study, copper nanoparticles were synthesized through the palm leaves extract that act as reducing agent. In this synthesis route, the hydroxyl groups of the polyphenols in palm extract are capable to act as reducing agent for reduction reaction. The effect of temperature given starting with control parameters at room temperature proceeds to 40, 50, 60, 70 and 80°C with the time length of 2 hours and 10 milimol copper nitrate aqueous solution. Characterization had been conducted using the instrument of UV-vis spectrophotometer, FTIR and ESEM. The average size of all powder nanoparticles was found to 109, 86, 196, 133, 241, and 230nm accordingly from room temperature till 80°C. The correspondence analysis of the results yielded that the optimum temperature was at 40°C which is 86nm of average copper nanoparticle size.

Green Synthesis of Silver Nanoparticles Using Elaeis guineensis (Palm Leaves): An Investigation on the Effect of Reaction Time in Reduction Mechanism and Particle Size

In this research, green synthesis of silver nanoparticles using elaeis guineensis leaves extract was investigated and the effect of reaction time in reduction mechanism and particle size is studied. UV-visible sprectrophotometer was used to monitored the reduction reaction of silver ions to silver nanoparticles and formation of silver nanoparticles shown at 15 minutes. Transmission electron microscopy (TEM) and field emission scanning electron microcopy (FESEM) shows polydispersed and irregular shape of silver nanoparticles with aggregation. Further confirms the formation of silver nanoparticles by energy dispersive x-ray analysis (EDAX). From this research, it was found that the increasing reaction time increases the rate of reduction reaction of silver ions.