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S Suprihatin
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Pengaruh Variasi Konsentrasi Asam Klorida Terhadap Laju Korosi Baja Karbon Rendah Astm A 139 Tanpa Dan Dengan Inhibitor Kalium Kromat 0,2% Dwi Septianingsih; Ediman Ginting Suka; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 2 No. 2 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i2.58

Abstract

Pengaruh Variasi Volume Terak (Slag) dan Abu Sekam Padi Terhadap Sifat Fisis dan Mekanis Komposit Semen-Terak (Slag)-Abu Sekam Padi Iwan M Ridwan; Pulung Karo Karo; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 2 No. 2 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i2.62

Abstract

Telah dilakukan pembuatan komposit konstruksi dari agregat limbah terak dan abu sekam padi. Perbandingan antara semen : terak (slag) : abu sekam padi yang dilakukan yaitu 1:2:3, 1:2:4, 1:2:5, 1:3:3, 1:3:4 dan 1:3:5. Pengujian dilakukan ketika sampel telah berumur 28 hari. Berdasarkan hasil pengujian, sampel 1:2:3 memiliki karakteristik yang lebih baik dibandingkan sampel lain. Sampel 1:2:3 memiliki bulk density (kerapatan) 0,950 gram/cm3, porositas 21,81%, nilai kuat tekan 55,17 kg/cm2 dan sifat penyerapan suara yang efisien pada frekuensi di bawah 1000 Hz. Berdasarkan uji kuat tekan sampel yang dihasilkan memiliki mutu yang setara dengan batako tipe III dan IV berdasarkan SNI 03-0348-1989 Selain itu berdasarkan uji kuat redam suara sampel yang dihasilakn memenuhi syarat minimum sebagai bahan peredam (0,15) sesuai dengan ISO 11654.
Pengaruh Konsentrasi Larutan Asam Klorida Tanpa dan dengan Inhibitor Kalium Kromat 0,2% Terhadap Laju Korosi Baja Api 5l Grade B Psl1 Elda Sefti Killeainda; Ediman Ginting Suka; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 3 No. 1 (2015): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v3i1.71

Abstract

Telah dilakukan penelitian mengenai pengaruh konsentrasi larutan asam klorida tanpa dan dengan inhibitor kalium kromat 0,2% terhadap laju korosi baja API 5L Grade B PSL1. Pengambilan data meliputi uji komposisi kimia, analisis laju korosi, analisis XRD (X-Ray Diffraction), analisis SEM (Scanning Electron Microscopy) dan EDS (Energy Dispersive Spectroscopy). Hasil uji komposisi kimia menunjukkan baja API 5L Grade B PSL1 merupakan baja paduan rendah (unsur paduan
INHIBISI KOROSI BAJA KARBON RENDAH C-Mn STEEL OLEH EKSTRAK DAUN TEH (Camellia sinensis) DALAM MEDIUM KOROSIF Marlina S Pakpahan; Ediman Ginting Suka; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 3 No. 2 (2015): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v3i2.92

Abstract

Telah dilakukan penelitian mengenai inhibisi korosi baja karbon rendah C-Mn steel oleh ekstrak daun teh (Camellia sinensis) dalam medium korosif HCl dan NaCl dengan konsentrasi masing-masing 3%. Pengujian dilakukan dengan metode penurunan berat. Laju korosi diuji pada baja karbon rendah tanpa dan dengan inhibitor ekstrak daun teh selama 4 hari dengan konsentrasi 10%, 15%, dan 20%. Hasil penelitian menunjukkan semakin besar persentasi inhibitor ekstrak daun teh yang digunakan maka laju korosi akan semakin berkurang dan kemampuan menginhibisi korosi akan meningkat. Efisiensi korosi yang paling besar terjadi pada konsentrasi 20% baik untuk HCl maupun NaCl dengan efisiensi masing-masing adalah 66,03% dan 32,89%. Hasil karakterisasi X-Ray Diffraction (XRD) memperlihatkan bahwa fasa yang terbentuk adalah Fe murni. Karakterisasi Scanning Electron Microscopy (SEM) memperlihatkan cluster (gumpulan) tidak merata dan ukuran lebih kecil, lubang (hole), dan retakan (crack) juga lebih sedikit dengan inhibitor dibandingkan tanpa inhibitor ekstrak daun teh. Hasil karakterisasi Energy Dispersive Spectroscopy (EDS) pada sampel tanpa inhibitor didapatkan unsur Cl.
Reversibilitas Reaksi Elektrokimia pada Elektroda Superkapasitor Zeolit Berbasis Silika Sekam Padi yang Dikalsinasi pada Suhu 450, 550, dan 650? Fatia Ulfah; S Suprihatin; Posman Manurung
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.135

Abstract

Zeolite based silica rice husk has been prepared at temperature of 450, 550, and 650?. This research was conducted to study the effect of calcination temperature in forming of crystalline phases and standard electron rate constant (k0). The zeolite K450 was formed quartz and bohmite phases, zeolite K550 and K650 was formed cristobalite, stishovite, gamma-alumina, and natrolite phases. Electrochemical reaction of zeolite K450, K550 and K650 are irreversible. Peak potential oxidation-reduction is between 240 mV and 390 mV. The higher value of calcination, the higher value of k0. The k0 value of zeolite K450, K550, K650 at scan rate of 1 V/s are 29,658 x 10-9; 36,398 x 10-9; 77,110 x 10-9 cm/s respectively. Natrolite phase of zeolite K550 and K650 have changed zeolite charge be netral. Based on these result, value k0 of zeolite K550 and K650 are going to be a reversible.
Pengaruh Luas Permukaan Spesifik terhadap Kapasitansi Spesifik Elektrode Zeolit Akibat Variasi Suhu Kalsinasi R Rosalina; S Suprihatin; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.136

Abstract

The effect of specific surface area to the specific capacitance of electrode zeolite with variation of calcintion temperatures. This study describes the potential of zeolite as a supercapacitor electrode which aims to determine the effect of surface area on the specific capacitance of the zeolite. Zeolites was synthesized from a mixture of silica based rice husk and alumina using sol gel methode and was calcined at 150, 250, 350, 450, 550, and 650oC. The XRD result showed already formed alumina and silica phases for each calcinations temperature and the temperature of 350oC has formed gmelinite phase which marks have been formed zeolite. The specific capacitance increase in the specific surface area at 90.69 - 150.01 m2/g, and occurred saturation of specific capacitance at a specific surface area of 150.01 m2/g. The highest of specific capacitance is at specific surface area of 150.01 m2/g is equal to 8.13x10-3 F/g obtained from zeolites with calcination temperature of 650oC. Based on this value, the zeolite can be used as a supercapacitor electrode material.
EFEKTIVITAS EKSTRAK DAUN SIRSAK SEBAGAI INHIBITOR PADA BAJA KARBON API 5L DALAM LARUTAN NaCl 3% Apriyanto Supriyo Giri; Ediman Ginting; S Suprihatin
Jurnal Teori dan Aplikasi Fisika Vol. 5 No. 1 (2017): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v5i1.137

Abstract

The effectiveness of soursop leaves extract as inhibitor on carbon steel API 5L in NaCl 3% had been researched. Carbon steel API 5L submersion used NaCl 3% had been done for 144 hours with various concentrations of soursop leaves extract inhibitor adding 0%, 5%, 10%, 15%, 20%, 25%, 30%, and 35%. The research of corrosion rate was done by weight loss and electrochemistry methods. The result showed that the higher percentage of soursop leaves extract inhibitor used, the corrosion rate will decrease and capability of inhibit corrosion will increase. The greatest effectiveness of corrosion occurred at concentration of 35% in NaCl 3% and the effectiveness is 86,16%. The X-Ray Diffraction (XRD) characterization result showed that the phase formed is pure Fe. Scanning Electron Microscopy (SEM) characterization showed uneven clusters and smaller size, fewer holes and cracks too with soursop leaves extract inhibitor 35% than soursop leaves extract inhibitor 0%. Energy Dispersive Spectroscopy (EDS) characterization on sample with inhibitor 0% obtained Cl element.
Co-Authors Apriyanto Supriyo Giri Dina Restia Ningrum Dwi Septianingsih Ediman Ginting Ediman Ginting Suka Elda Sefti Killeainda Fatia Ulfah Febri Reviana Iwan M Ridwan Marlina S Pakpahan Meli Ratna Sari Posman Manurung Pulung Karo-Karo R Rosalina Rianita Nurhasanah Subarwanti, Yunita