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All Journal Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Makara Journal of Science Journal of Batteries for Renewable Energy and Electric Vehicles
Hardiansyah, Andri
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Chemical Engineering, Chemistry & Bioengineering Chemistry Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mechanical Engineering

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Fabrication and Characterization of Nylon 6 Fiber via Wet Spinning Method for Application as a Reinforcing Material for a Direct Dental Bridge Wijaya, Dissa Kirana; Djustiana, Nina; Faza, Yanwar; Cahyanto, Arief; Hardiansyah, Andri
Makara Journal of Science Vol. 27, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Nylon is a biocompatible thermoplastic polymer that is well known for its excellent fracture resistance, making it suitable for fabricating fiber-reinforced composite (FRC)-based dental bridges. FRC is widely used in dentistry. This study aimed to investigate the structural and morphological characteristics of the nylon 6 fiber prepared using five different weights of nylon 6 dissolved in formic acid. The nylon 6 fiber was successfully fabricated via a simple wet spinning method using water as a coagulant. The fiber was then characterized using Fourier transform infrared (FTIR) spectroscopy, optical microscopy, and scanning electron microscopy. FTIR spectroscopy confirmed the presence of nylon 6 characteristics in the fiber in the form of N–H and C=O groups at a specific wave number. The differences in the diameter and morphological shape of the fiber were attributed to the nylon 6 different concentrations. Furthermore, the nylon 6 fiber can be used to produce cost-effective products and realize suitable characteristics for use as an alternative to traditional materials for fabricating direct dental bridges.
Synthesis and Characterization of Titanium Dioxide/Graphene Nanoplatelets Nanocomposites via Planetary Ball Milling for Military Radar Absorbing Materials Amalia, Gita Resty; Hardiansyah, Andri; Rasendriya, Anselmo Bima; Rahmadtullah, Ismail; Setiono, Andi; Murniati, Riri
Indonesian Journal of Chemical Studies Vol. 4 No. 1 (2025): Indones. J. Chem. Stud., June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i1.67

Abstract

Stealth technology is widely used in the military field to avoid enemy detection. Consequently, there has been a significant surge in research related to radar-absorbing materials (RAMs). Titanium dioxide (TiO2) and graphene nanoplatelets (GNPs) are promising materials for developing RAMs. Combining TiO2 as a semiconductor with GNPs as a conductive material could increase the ability to absorb microwaves through a more effective energy dissipation mechanism. In our study, TiO2 and GNPs were fabricated using the planetary ball milling method. The structure and morphology of the resulting nanocomposites were evaluated using Field Emission Scanning Electron Microscopy with Energy Dispersive Spectroscopy with Energy Dispersive Spectroscopy (FE-SEM EDS) and X-ray Diffraction (XRD). FE-SEM observations showed that TiO2 nanoparticles were attached to the surface of layered GNPs. XRD analysis showed a decrease in the peak intensity of the TiO2/GNP nanocomposites compared to pure TiO2 due to the addition of carbon elements. The performance of RAMs was evaluated using a Vector Network Analyzer (VNA) in the X-band (8-12 GHz) range with a 3-mm thickness. The VNA analysis indicated that the TiO2/GNP nanocomposites exhibited the optimal reflection loss (RL) of -30.72 dB at a frequency of 8.42 GHz, accompanied by a through power of 99.91%. Consequently, TiO2/GNP nanocomposites demonstrated promising potential as a military RAM.
Fabrication and Characterization of Graphene Nanoplatelets/Zinc Oxide Nanocomposites as a Military Radar Absorbing Material Rasendriya, Anselmo Bima; Hardiansyah, Andri; Amalia, Gita Resty; Rahmadtullah, Ismail; Setiono, Andi; Piliang, M. Zuhnir; Renta, Hotma
Indonesian Journal of Chemical Studies Vol. 4 No. 1 (2025): Indones. J. Chem. Stud., June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i1.69

Abstract

Stealth aircraft have the capability to intercept radar waves. One common technique involves the use of radar-absorbing materials (RAMs). This study focused on the synthesis of advanced lightweight functional materials derived from advanced carbon and semiconductor compounds for microwave absorbing through mechanical homogenization. Graphene nanoplatelets (GNP) and Zinc Oxide (ZnO) possess excellent dielectric and magnetic loss capability due to their thermal conductivity, small particle size, large surface area, disordered structure, and lightweight nature. The GNP and ZnO were developed as advanced carbon and semiconductor nanocomposites using Planetary Ball Milling (PBM) at a ratio of 1:1. This approach aimed to improve the structure, morphology, and electromagnetic performance of the materials. A comparison between the nanocomposite materials and their precursors was conducted to clarify the advantages of using nanocomposites. FE-SEM showed the layered carbon sheets in GNP. XRD exhibited the alteration in the crystallite structure of ZnO, while FTIR spectroscopy confirmed the presence of specific functional groups. In addition, the GNP/ZnO nanocomposites showed strong microwave polarization capabilities. Notably, the GNP/ZnO nanocomposite achieved the lowest RL value compared to the precursor materials with a value of -28.21 dB at 8.45 GHz and a thickness of 3 mm in the scope of X-band range. While the through power was calculated at 99.84%. Through mechanical homogenization, a well-structured disordered crystallite layered material was fabricated for military RAMs. In the industrial sector, GNP/ZnO nanocomposites showed promising potential as a lightweight and advanced functional material for future stealth aircraft applications.
The Calcination Temperature Effect on Crystal Structure of LiNi1/3Mn1/3Co1/3O2 Cathode Material for Lithium-Ion Batteries Rahayu, Sri; Saudi, Aghni Ulma; Tasomara, Riesma; Gumelar, Muhammad Dikdik; Utami, Wahyu Tri; Hapsari, Ade Utami; Raharjo, Jarot; Rifai, Abdulloh; Khaerudini, Deni Shidqi; Husin, Saddam; Saputra, Dita Adi; Yuliani, Hanif; Andrameda, Yurian Ariandi; Taqwatomo, Galih; Arjasa, Oka Pradipta; Damisih, Damisih; Hardiansyah, Andri; Pravitasari, Retna Deca; Agustanhakri, Agustanhakri; Budiman, Abdul Hamid
Journal of Batteries for Renewable Energy and Electric Vehicles Vol. 1 No. 02 (2023): NOVEMBER 2023
Publisher : NBRI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59046/jbrev.v1i02.22

Abstract

The lithium-ion battery has gained popularity among other secondary batteries for portable electronic devices and electric vehicle applications, especially the LiNi1/3Co1/3Mn1/3O2 or NMC111, considering its well-balanced configuration resulting in stable and safe electrochemical performance. NMC111 has been successfully prepared using a coprecipitation process at calcination temperatures from 800 to 950°C. The physical characteristics were investigated using X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS), and Particle Size Analysis (PSA). The XRD patterns showed the rhombohedral single phase for all calcination temperatures. Meanwhile, higher calcination temperatures offer higher degree of crystallinity, lower intensity ratio and more undesirable cation mixing. The particles with a uniform rectangle or pyramid shape are observed at the calcination temperature range from 800 to 900°C. However, bigger submicron particles with a rectangle or pyramid shape are detected at a higher temperature (950°C). The SEM-EDS mapping shows the homogeneity composition for all variation calcination temperatures. PSA analysis showed that calcination temperature at 800 and 850°C gives the particle less than 400 nm suggesting a potential material for a cathode of lithium-ion batteries.
Co-Authors Abdul Hamid Budiman Agustanhakri, Agustanhakri Amalia, Gita Resty Andi Setiono Andrameda, Yurian Ariandi Cahyanto, Arief Damisih, Damisih Deni Shidqi Khaerudini Gumelar, Muhammad Dikdik Hapsari, Ade Utami Husin, Saddam Jarot Raharjo Murniati, Riri Nina Djustiana Oka Pradipta Arjasa Piliang, M. Zuhnir Pravitasari, Retna Deca Rahmadtullah, Ismail Rasendriya, Anselmo Bima Renta, Hotma Rifai, Abdulloh Saputra, Dita Adi Saudi, Aghni Ulma SRI RAHAYU Taqwatomo, Galih Tasomara, Riesma Wahyu Tri Utami Wijaya, Dissa Kirana Yanwar Faza Yuliani, Hanif