The montmorillonite (MMT) nanoparticles as patchouli oil bleaching has been prepared from the isolated MMT of Aceh Tamiang bentonite. MMT in bentonite powder was isolated through a top-down isolation method by ultrasonication, sedimentation and high energy milling process. As many as 14% of MMT was successfully isolated and characterized via XRF and XRD. XRF analysis on the composition of isolated MMT indicated that the major composition of MMT are Si (24.76%) and Al (16.37%). From XRD pattern, the two theta (2θ) peak of MMT are about 19.85°, 20.30° , 26.62 and 50.15° that was identified as MMT (empirical formula (Si7.80Al1.72Cs0.16Fe0.20Mg0.28O20.00)), indicating the success of the isolation process. Furthermore, based on the results calculated using XRD with Scherer’s equation, the size of MMT was 0.42 nm and the derived lattice constant was 4.20 Å. Moreover, the MMT nanoparticles exhibited as a good Patchouli Oil Bleaching material to reduce colors in oil.

Kuala Geulumpang village is one of the villages in Julok subdistrict where most of the community is a business group that processes fish into cracker or known as pakang fish. One of the problems experienced by the business group is the drying process, especially in the rainy season which result decrease in the color quality and taste of pakang fish products. This service program aims to provide a solution for drying media that is not depend by weather conditions, namely a home dried system using an integrated solar panel media based on solar energy through solar cell and current batteries storage. This method has advantages compared with conventional methods are that are not affected by the weather, faster the drying process, minimizes fish damage caused by decaying so that the quality of the product is maintained and can be accepted by consumers on time. Through the application of fish dryer technology is expected to increase the production and quality of pakang fish produced by the community of Kuala Geulumpang Village so that it can improve the community's economy.

Current-Voltage Characteristics of solar cells p-n junction ZnO and TiO2 parallel in the Cu2O layer has been determined using solar irradiation. Metal oxide has been used as a semiconductor material, such as ZnO and TiO 2 is an n-type semiconductor. The material has gap energy of 3.37 eV and 3.2 eV. Thermal oxidation is applied to commercial Cu plates for 60 minutes to produce Cu2O layers as p-type semiconductors. The process varies in temperature, namely 300, 400, and 500 °C. The process of thermal oxidation on Cu plates at a temperature of 300 °C increases the impurity in the Cu2O layer. The impurity layer is CuO. Then the CuO layer formed decreases with increasing temperature thermal oxidation. CuO layer increases the efficiency of solar cells p-n junction TiO2-ZnO parallel in the layer Cu2O. The results of measurements with sunlight showed that the TiO2-ZnO/Cu2O (300) samples had the highest solar cell efficiency, which was 0.28 %.

Hydrogen is a renewable energy source that can be used as a fuel and as an  alternative to fossil fuels. Solid  storage media in solid form are safer to use than liquid (-253 oC) or gaseous media (700 bar) media. To store hydrogen in a solid medium, it requires a metal able to  interact with hydrogen . Magnesium is one of the metals which  can form metal hybrids based on MgH2 which is capable of  absorbing hydrogen up to  (7.6wt%). However, the reaction kinetics for  magnesium are  very slow, it takes at least 60 minutes to absorb hydrogen and the operating temperature is always  very high (300 oC). Several attempts have been made to add the catalytic converter  and milling time. Hydrogen storage material based on MgH2 with a 10wt%Ni catalyst was  successfully synthesized using a mechanical alloy technique with time variations of 2 hours, 5 hours, and 10 hours. From the results of the X-ray diffraction schema  at a diffraction angle of 2θ=37.87o, it shows the presence of a MgH2 phase, Ni phase is at a diffraction angle of 61.85o, the diffraction peak also shows that there was a  widening of the diffraction peak with increasing milling time, this explains that there was  a reduction in the size of the crystal. When  calculating  with the Schereer method, the crystal size of the material reaches 10 nm. The results of the DSC test indicated  a decrease in temperature of 383 oC in 41 minutes with a milling time of 10 hours.

Research on the synthesis and characterization of manganese ferrite nanoparticles with the coprecipitation method at low temperature has been carried out. The purpose of this study was to the determine the effect of low temperature on the microstructure of MnFe2O4 nanoparticles. The synthesis of nanoparticles carried out using the coprecipitation method, characterization using XRD and SEM. XRD measurement data were processed using Software Origin 9.0, obtained a crystalline phase diffraction pattern of MnFe2O4 and a crystal with a spinel structure. The crystallite size obtained was 5,79 nm at 90 °C, 5,65 nm at 120 °C and 5,47 nm at 150 °C with an average lattice parameter of 9,16 Å. Crystallite size can be controlled using the synthesis method at low temperatures. The surface morphology of the SEM test showed that an average grain size of 5,93 nm was spherical with quite various sizes and clots.