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2 results on '"Mardiyanto, Mardiyanto"'

1. Surface modification of polyimide kapton film by high fluence gadolinium (Gd) ion implantation.

Author

Purwantoo, Setyo, Sujitno, Tjipto, Taryana, Yana, Putra, Teguh Yulius Surya Panca, Yuliani, Hanif, Rivai, Abu Khalid, Mardiyanto, Mardiyanto, and Mustofa, Salim

Subjects
*ION implantation, *GADOLINIUM, *CARBON films, *POLYIMIDE films, *ION energy, *DIFFRACTION patterns, *MAGNETIC properties
Abstract

The surface modification of Kapton Polyimide (C22H10N2O5) film has been carried out with the Gadolinium (Gd) ion implantation technique at high doses and low energy. In this research, Kapton Polymide type HN film with a thickness of 125 micrometer was used. The ion doses used were 1×1015 ions/cm2 until 1×1017 ions/cm2 at energy ions 30 keV. This process is known to cause several changes in the properties of Kapton films, such as the degree of film crystallization, conductivity and magnetic properties and the microwave absorption properties of Kapton films. Simulation of the Gd ion implantation process with SRIM software showed that ions were embedded into the surface of the Kapton film as deep range between 20 until 50 nanometers. The distribution of Gd ions mapping in the subsurface region of the film was confirmed by SEM/EDX technique. As well as the distribution of constituent atoms of Kapton polyimide film such kind of Carbon, Hydrogen, Nitrogen and Oxygen with slighty change in composition due to carbonised polymer, degassing process as confirmed from X-ray diffraction pattern analysis. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Mg-Al/Biochar Composite with Stable Structure for Malachite Green Adsorption from Aqueous Solutions.

Author

Badri, Arini Fousty, Patimah Mega Syah Bahar Nur Siregar, Palapa, Neza Rahayu, Mohadi, Risfidian, Mardiyanto, Mardiyanto, and Lesbani, Aldes

Subjects
*MALACHITE green, *COMPOSITE structures, *AQUEOUS solutions, *PHYSISORPTION, *ADSORPTION (Chemistry)
Abstract

Mg-Al-layered double hydroxide (LDH) was fabricated using a coprecipitation method at pH 10. Thereafter, Mg- Al-LDH was impregnated with biochar to manufacture a Mg-Al/Biochar composite. The composite was characterized using powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, N2 adsorption-- desorption, thermogravimetry-differential thermal analysis (TG-DTA), and scanning electron microscopy (SEM) experiments, and was subsequently used for malachite green (MG) adsorption. MG adsorption experiments were performed in a batch system, and the effects of temperature and adsorption kinetic and isotherm parameters on the adsorption process were analyzed. The stability of Mg-Al/Biochar was evaluated using regeneration experiments over three cycles. The peaks at 11.47° (003), 22.86° (002), 34.69° (012), and 61.62° (116), in the XRD profile of Mg-Al/Biochar suggested that Mg-Al/Biochar was successfully fabricated. The surface area of Mg-Al/Biochar was up to five times larger than that of pristine Mg-Al-LDH. The adsorption of MG on Mg-Al/Biochar was dominated by interactions at the surface of the adsorbent and was classified as physical adsorption; moreover the maximum adsorption capacity of Mg-Al/Biochar was 70.922 mg/g. Furthermore, the MG removal of Mg-Al/Biochar during three successive adsorption cycles (i.e. 66.73%, 65.57%, and 65.77% for the first, second, and third adsorption cycle) did not change significantly, which indicated the stable structure of the adsorbent. [ABSTRACT FROM AUTHOR]

Published
2021
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