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All Journal Jurnal Kedokteran dan Kesehatan : Publikasi Ilmiah Fakultas Kedokteran Universitas Sriwijaya Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya
Siti Khomsatin
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Medicine & Pharmacology Neuroscience Public Health

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PREPARATION STUDY OF FE₃O₄-COCONUT SHELL CHARCOAL AS A CARBON QUANTUM DOTS CQDS BASED NANOPARTICLE MATERIAL Yoshi Adhitia Mahendra; Siti Khomsatin
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6297

Abstract

This research aims to study the preparation of Fe₃O₄ nanoparticles based on coconut shell charcoal as a carbon source for Carbon Quantum Dots (CQDs) using the hydrothermal method. The synthesis of Fe₃O₄ nanoparticles was carried out through the coprecipitation method by mixing FeCl₃·6H₂O and FeSO₄·7H₂O solutions while stirring at 60°C, followed by the addition of CQD solution derived from coconut shell charcoal. The variable parameters include the mass of coconut shell charcoal, reaction temperature, and precursor concentration. Characterization was performed using X-ray Diffraction (XRD) to determine the optical properties, crystal structure, and magnetic properties of the resulting nanoparticles. The results indicate that Fe₃O₄-CQD nanoparticles possess a specific crystal structure and magnetic properties suitable for applications in bioimaging and catalysis. This research contributes to the utilization of organic waste as a raw material for environmentally friendly nanomaterials and has the potential to enhance the economic value of coconut waste. Suggestions for future development include optimization of synthesis parameters and performance testing of the material in real-world applications.
THE EFFECT OF ACNE VULGARIS ON BODY IMAGE, SELF-ESTEEM, AND SELF-CONFIDENCE AMONG ADOLESCENTS Ayu Chintya, Shally; Nafiah Apriliasiharta; Siti Khomsatin
Jurnal Kedokteran dan Kesehatan : Publikasi Ilmiah Fakultas Kedokteran Universitas Sriwijaya Vol. 13 No. 1 (2026): Jurnal Kedokteran dan Kesehatan : Publikasi Ilmiah Fakultas Kedokteran Univers
Publisher : Fakultas Kedokteran Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32539/3kfqpv97

Abstract

Acne vulgaris, or acne, is a common skin problem among adolescents, primarily due to hormonal, physical, psychological, and social changes. This study aims to analyze the impact of acne on body image, self-esteem, and self-confidence among adolescents in Islamic boarding schools. A quantitative method with a case-control design was used on 170 respondents (90 cases, 80 controls). The research instruments included the BAS-2 for body image, the GSES for self-confidence, and the RSES for self-esteem. Analysis was conducted using the chi-square test (95% CI) and path analysis. The results showed that acne directly affected body image (b=0.64; p=0.042), self-esteem (b=-1.16; p=0.001), and self-confidence (b=-0.70; p=0.045). Indirectly, body image affected self-esteem, and self-esteem affected self-confidence. These findings confirm that acne has a significant impact on the psychological aspects of adolescents, thus requiring special attention in efforts to improve mental health and social support.adolescents. Body image indirectly influence self-confidence through self-esteem, and self-esteem also has an indirect effect through self-confidence.
Co-Authors Ayu Chintya, Shally Marsyanda Wenindyah Hamaminanto Nafiah Apriliasiharta Shally Ayu Chintya Yoshi Adhitia Mahendra