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All Journal Jurnal Fisika FLUX Jurnal Teori dan Aplikasi Fisika
Junaidi Junaidi
Jurusan Fisika FMIPA Universitas Lampung
Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Kontrol Kecepatan dan Temperatur dengan Teknik Pulse Widht Modulation untuk Aplikasi Hotplate Stirrer Berbasis Arduino Junaidi Junaidi; Handani Wahyu Hesti; Suciyati Wahyu Sri; Supriyanto Amir
Jurnal Fisika FLUX Vol 17, No 1 (2020): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1252.546 KB) | DOI: 10.20527/flux.v17i1.6634

Abstract

In this research, design and realization of temperature and speed control instrument using thermocouple and pulse width modulation based on arduino for hotplate stirrer aplication have been carried out. This instrument is laboratory tool used for stiring and heating a chemical liquid with capability up to 1200 rpm and 300 oC, respectively. The main components used in the manufacture of hotplate stirrer are Arduino mega, DC motor, tubular heater, LM393 optocoupler sensor, MAX6675 type-K thermocouple, and sevent segment. The hotplate stirrer has a tolerance of rotational speed measurement of ±5 rpm and a tolerance of temperature measurement of ±5 oC. The accuracy of temperature and rotating speed measurement in this instrument about 0,25 oC and 2 rpm. Based on its capabilities, this instrument can be applied to research on synthesis of material at the micro and nano scale.
Pengaruh Variasi Waktu Pemanasan Sintesis Perak Nitrat (AgNO3) Menggunakan Metode Reduksi Kimia Junaidi Junaidi; Muhammad Rizki; Daffa Abdul Malik; Dwi Asmi; Roniyus Marjunus; Pulung Karo Karo
Jurnal Teori dan Aplikasi Fisika Vol 11, No 2 (2023): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v11i2.12308

Abstract

Synthesis of silver nitrate using the chemical reduction method with variations in heating time for 1 hour, 2 hours and 3 hours has been successfully carried out. This study aims to determine the effect of variations in heating time on the phase structure, elemental concentration, morphology, and mass percentage of elements. The synthesis process was carried out by heating a mixture of silver and nitric acid at T = 85 °C for 1 hour, 2 hours and 3 hours, then the evaporation process was carried out at T = 125 °C for 10 minutes. The results of the XRF analysis on the AgNO3 samples showed differences in the percentage of Ag concentrations, with the largest percentage of Ag concentrations produced, namely 98.839% at a 2 hour heating time variation, the presence of impurities in the XRF results of AgNO3 samples at a concentration of more than 1%, with a concentration of impurities the largest is copper (Cu), this is what causes the synthesized sample to turn blue. The results of the XRD analysis showed that the AgNO3 phase had an orthorhombic structure with the largest percentage of AgNO3 produced, namely 27.85% at 2 hours of heating time variation.
Co-Authors Daffa Abdul Malik Dwi Asmi Handani Wahyu Hesti Muhammad Rizki Pulung Karo Karo Roniyus Marjunus Suciyati Wahyu Sri Supriyanto Amir