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Chemistry and Materials
Published by The Center for Science Innovation
ISSN : 2828271X     EISSN : 28282310     DOI : https://doi.org/10.56425/cma
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology
Chemistry and Materials is a peer-reviewed journal published by The Center for Science Innovation (Pusat Inovasi Sains). The journal covers all aspects of Chemistry and Materials including synthesis, characterization, and applications. Theoretical and computational studies are also welcome.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 3 No. 2 (2024)" : 5 Documents clear
Square Wave Pulse Deposition of Gold Nanoparticles for Ethanol EOR Performance and Its Electrochemical Properties Investigation Mahmud, Amir; Tri Goutomo, Bimo
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.75

Abstract

In this study, gold nanoparticles (Au NPs) were successfully synthesized using square wave pulse deposition. The synthesis process involved applying a lower potential of -0.1 V and an upper potential of 0 V for 25 minutes. Characterization of the synthesized Au NPs was conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The XRD analysis confirmed the formation of the Au phase on the FTO substrate. The SEM images revealed a nanopyramid-like morphology, with an average particle size ranging from 20 to 200 nm. The EIS measurements indicated low resistance values for the Au NPs. During the CV test for ethanol electrooxidation, a stable electric current of 4.28 mA/cm² was achieved, demonstrating good stability in the electrochemical process.
Utilization of Used Cooking Oil in Making Liquid Soap with the Addition of Water Hyacinth (Eichhornia crassipes) Leaf Extract as an Antibacterial Nababan, Bella Pricilya; Mulmeyda, Rinda; Insyani, Navisya Putri
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.76

Abstract

The frequent disposal of used cooking oil into waterways, along with the proliferation of water hyacinth plants that become invasive in water bodies, contributes to environmental pollution and compromises ecosystem health. One of the effective solutions against various diseases is thorough handwashing with antibacterial soap to eliminate germs and dirt. Therefore, this study aims to investigate the impact of water hyacinth leaf extract addition on the antibacterial activity of cooking oil-based liquid soap. The research employs an experimental approach. Results from pH testing indicate that all liquid soap formulations produced meet the criteria for high-quality liquid soap. Among the variations tested, the formula containing 5% water hyacinth extract exhibited the best foam stability. Regarding antibacterial efficiency, the results suggest that all three samples exhibited weak inhibition of bacterial growth. However, the formula with 10% water hyacinth concentration showed the highest average inhibition zone of 3.46 mm.
Utilization of Plantain Peel (Musa sapientum) and Sweet Potato Starch (Ipomea batatas) Waste in Combination with Glycerol Addition to Produce Biodegradable Plastic Shafa Maura, Chika; Athariq, Muhamad; Mulmeyda, Rinda
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.77

Abstract

Starch is a natural polymer derived from plants, known for its biodegradability, environmental friendliness, wide availability, and affordability. Glycerol, with its low molecular weight, serves as an effective plasticizer. Its addition enhances the physical and mechanical properties of plastics and provides protection against microbial degradation. This study aims to investigate the impact of glycerol addition on the mechanical properties of biodegradable plastics made from sweet potato starch and plantain peel waste. The research is an experimental to achieve this goal. The results indicated that all samples achieved 100% degradation, with elongation percentages ranging from 93.59% to 137.56%. The sample containing 10 grams of sweet potato starch and 5 grams of banana peel starch exhibited the lowest water absorption percentage at 73.43%. Additionally, the bioplastic sample consisting of 5 grams each of sweet potato starch and banana peel starch showed the highest thickness at 0.36 mm, meeting the established SNI standards. In conclusion, the mechanical properties, biodegradability, and transparency of bioplastics are influenced by variations in sweet potato starch and plantain peel starch composition, as well as by the addition of glycerol.
Antioxidant Activity of AuPt Nanoparticle with Square-Wave Pulse Deposition Method Syafei, Devi Indrawati
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.79

Abstract

Gold nanoparticles and platinum nanoparticles are considered to be effective antioxidants due to their ability in inhibiting free radicals. In this research, AuPt nanoparticles were synthesized using a square wave pulse deposition method by varying the lower potential (EL). The XRD results stated that AuPt nanoparticles had formed on the FTO substrate. The shape of AuPt nanoparticles is an irregular sphere in SEM-EDX characterization. EDX characterization also concluded that AuPt nanoparticles had formed on the FTO substrate. Antioxidant testing using the DPPH test resulted the largest inhibition value for AuPt NPs, with a lower potential of -0.6 V and the inhibition activity of 77.17%.
Synthesis Dithizone-Immobilized In Polivinyl Chloride Membranes For Copper Detection in Water Pratiwi, Yussi; Febrian, Yogi; Klaudia, Angelina
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.80

Abstract

A simple, cost-effective, and environmentally friendly analytical method is needed to determine Cu (II) levels in water. Many methods have been developed by immobilizing dithizone in a polyvinyl chloride (PVC) matrix with dioctyl phthalate (DOP) as a plasticizer in a tetrahydrofuran (THF) solvent. However, the optimal composition of PVC, DOP, and THF has not been determined. The purposes of this study were to determine the optimal composition of dithizone, PVC, and DOP for the sensor membranes, evaluate the performance of the chemical sensors in detecting Cu (II) ions, and measure the copper content in conventional drinking water. The research began with the fabrication of sensor membranes, followed by absorbance testing, and concluded with method validation through characterization. Adsorption of Cu (II) caused the membrane colour to change from yellow to reddish orange, with maximum absorbance observed at 427 nm. The sensor membrane exhibited the best response to Cu (II) ions at pH 2.8. A linear calibration curve for Cu (II) was obtained in the concentration range of 0-0.6 ppm, with an R² value of 0.9924. The limit of detection was 1.9881 x 10⁻³ mg L⁻¹, and the limit of quantification was 6.0245 x 10⁻³ mg L⁻¹. The molar absorptivity was 9.4831 x 10⁴ L mol⁻¹ cm⁻¹. The proposed sensor membrane was used to measure Cu (II) in drinking water employing the internal standard addition method, with observed recoveries ranging from 98.63% to 100.29%. The copper levels in the drinking water samples tested in this study did not exceed the drinking water quality standards set by PERMENKES RI number 492/PER/IV/2010.

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