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Fulltext Optical and Thermal Properties of Laser-Ablated Platinum Nanoparticles Graphene Oxide Composite

Sadrolhosseini AR, Habibiasr M, Shafie S, Solaimani H, Lim HN

Int J Mol Sci, 2019 Dec 06;20(24).
PMID: 31817593 DOI: 10.3390/ijms20246153

Platinum nanoparticles were synthesized in graphene oxide aqueous solution using a laser ablation technique to investigate the effect of optical linear, nonlinear and thermal properties of platinum-graphene oxide nanocomposite solution. The samples were prepared with different ablation times. The platinum nanoparticles that formed a spherical shape on the surface of graphene oxide solution were authenticated using UV-visible spectrum and transmission electron microscopy patterns. The particle size decreased with increasing ablation time, and the concentration and volume fraction of samples were increased. To obtain the optical linear, nonlinear and thermal properties of platinum-graphene oxide nanocomposite solution, UV-visible spectroscopy, Z-scan, thermal lens and photoacoustic techniques were used. Consequently, the linear and nonlinear refractive indices increased with an increase in the volume fraction of platinum nanoparticles. It was observed from the spatial self-phase modulation patterns that, the optical nonlinear property of the graphene oxide was enhanced in the presence of platinum nanoparticles, and the nonlinearity increased with an increase in the volume fraction of platinum nanoparticles inside the graphene oxide solution. The thermal diffusivity and thermal effusivity of platinum nanoparticles graphene oxide were measured using a thermal lens and photoacoustic methods, respectively. The thermal diffusivity and thermal effusivity of samples were in the range of 0.0341 × 10-5 m2/s to 0.1223 × 10-5 m2/s and 0.163 W s1/2 cm-2 K-1 to 0.3192 W s1/2 cm-2 K-1, respectively. Consequently, the platinum enhanced the optical and thermal properties of graphene oxide.
Effect of drying on the physical and chemical properties of palm kernel oil

Habibiasr M, Noriznan Mokhtar M, Nordin Ibrahim M, Md Yunos KF, Amri Ibrahim N

J Sci Food Agric, 2022 Jan 08.
PMID: 34997572 DOI: 10.1002/jsfa.11753

BACKGROUND: Palm kernel is the edible seed of the oil palm fruit obtained during the palm oil milling process. For efficient processing and storage, the moisture content of palm kernel must be reduced to an optimal level by drying. This study aimed to see how drying influenced the physical structure and physicochemical properties of palm kernel and oil. Before and after drying, the free fatty acid (FFA), colors, fatty acid composition, FTIR, thermal property, and structure of palm kernel were investigated.
RESULTS: Results show that drying significantly (p

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