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All Journal Jurnal Ilmu Dasar Jurnal Pendidikan Fisika Journal of Science and Applicative Technology
deska lismawenning puspitarum
Institut Teknologi Sumatera
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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KARAKTERISASI DAN SIFAT KEMAGNETAN PASIR BESI di WILAYAH LAMPUNG TENGAH deska lismawenning puspitarum; gita safitri; harlina ardiyanti; mohamad samsul anrokhi
Jurnal Pendidikan Fisika Vol 7, No 2 (2019)
Publisher : UNIVERSITAS MUHAMMADIYAH METRO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/jpf.v7i2.2189

Abstract

Karakterisasi dan pengujian sifat kemagnetan pasir besi ekstraksi di Wilayah Lampung Tengah telah dilakukan. Penelitian ini bertujuan untuk mengetahui kandungan mineral dan sifat kemagnetan dari pasir besi di daerah Bekri Kabupaten Lampung Tengah dengan menggunakan metode presipitasi basa. Penelitian ini dilakukan di Laboratorium Fisika, Institut Teknologi Sumatera pada bulan Juni hingga September 2018. Kandungan mineral pasir dianalisis menggunakan X-Ray Diffractometer (XRD). Hasil analisis ekstraksi pasir besi dengan variasi suhu 80oC, 120oC, dan 160oC berturut-turut berukuran 33.76 nm, 11.84 nm dan 11.14 nm. Sedangkan hasil analisis ekstraksi pasir besi dengan lama pengadukan yaitu 2 jam, 4 jam, dan 6 jam  berturut-turut memiliki ukuran partikel 43.12 nm, 11.14 nm, dan 11.32 nm. Hasil analisis kandungan mineral pasir besi di wilayah Lampung Tengah didominasi oleh Ilmenite dan Potassium Chloride. Kurva histerisis Vibrating Sample Magnetometer (VSM) menunjukkan bahwa pasir besi ekstraksi dari Lampung Tengah merupakan material antiferomagnetik dengan nilai magnetisasi saturasi maksimum (Ms) sebesar 5.78 memu (mili emu), magnetisasi remanen (Mr) 1.13 memu dan nilai medan koersivitas sebesar 851.68 Oe.
Effect of Red Dragon Fruit Extract as Dye in Solar Cells Ajeng Eliyana; Deska Lismawenning Puspitarum; Dana Laksono
Jurnal ILMU DASAR Vol 21 No 1 (2020)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (131.352 KB) | DOI: 10.19184/jid.v21i1.10922

Abstract

Along with the development of nanotechnology, the development of solar cells entered a significant stage with the emergence of the newest generation, namely DSSC (Dye Sensitized Solar Cell). The utilization of dragon fruit skin which has been extracted as dye in dye sensitized solar cells and solar cell development to realize sustainable energy supply is the main target in this study. The method carried out begins with the synthesis of nanoparticles from organic material (TiO2), to obtain good TiO2 material as an anti-reflection, where anti-reflection is selected on DSSC technology to reduce light reflection in the visible light region. The crystal size of TiO2 was analyzed as an oxide layer material in DSSC. DSSC synthesis was carried out and the parameters of organic solar cell devices (DSSC) were optimized to obtain solar cells with good conversion efficiency. The results showed that the size of TiO2 obtained was an average of 0.211 nm and the maximum wavelength value of the extract of the dragon fruit dye solution was 530 nm. Keywords: dye, solar cell, DSSC, TiO2.
ANALISA GUGUS FUNGSI PADA NANOPARTIKEL MAGNESIUM FERRITE (MgFe2O4) YANG DIENKAPSULASI DENGAN POLYETHYLENE GLYCOL (PEG-4000) DAN SILIKA Deska Lismawenning Puspitarum
Journal of Science and Applicative Technology Vol 2 No 1 (2018): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (231.732 KB) | DOI: 10.35472/281473

Abstract

Magnesium Ferrite Magnesium (MgFe2O4) magnetic nanoparticles have been successfully carried out by varying the concentrations of PEG-4000 and silica as encapsulation materials using coprecipitation methods. The X-ray Diffraction (XRD) analysis showed that new phases appeared in MgFe2O4 after PEG-4000 encapsulation, ie α-Fe2O3 having a paramagnetic rhombohedral and γ-FeO (OH) structure. The particle size of MgFe2O4 before encapsulation was 10.5 nm, after encapsulation with PEG-4000 became 5.2 nm and encapsulation with silica became 18.8 nm. In encapsulation with silica, the peak of the new diffraction field 222 which is a crystal appears. The result of Fourier Transform Infra-Red (FTIR) analysis showed that in MgFe2O4 coated with PEG-4000, there was a shifting in the wave number 2885.5 cm-1 to 2924.1 cm-1 in CH bond which was the bond of PEG- 4000 and a shifting in the wave number 316.3 cm-1 to 300.9 cm-1 on the metal oxide bond (MO) which is a uniform pattern of MgFe2O4. The presence of silica which has coated the magnetic material is shown in the 455.2 cm-1 number of Si-O-Si (bending) group.
Co-Authors Ajeng Eliyana Anrokhi, Mohamad Samsul Dana Laksono gita safitri harlina ardiyanti