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All Journal Indonesian Journal of Chemistry Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) International Journal of Applied Mathematics, Sciences, and Technology for National Defense
Anitasari, Reza
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Mathematics Physics

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Iron determination in multivitamin tablets: Enhancing military nutritional preparedness based linear regression method Prasojo, Agus Eko; Anitasari, Reza; Sijabat, Windy Nelasari; Nurrosyid, Naufan
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol 1, No 2 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i2.165

Abstract

AAS is also an important method that has the most extensive application in metal analysis. most of the determinations were carried out by thin spectrophotometry, therefore an experiment was carried out to determine the Fe content in multivitamin tablets using the atomic absorption spectrophotometry method has high selectivity and sensitivity. Standard solution preparation. Prepare a standard solution of Fe with a concentration of 1, 2, 3, 4, and 5 ppm, then read the absorbance of the standard solution on AAS. Sample solution preparation and absorbance measurement. Several tablets were put into a beaker and 7 ml of concentrated HCl was added working principle of atomic absorption spectrophotometry is based on the evaporation of the sample solution which will initially be nebulized to form a spray, then it will be desolvated to form a dry aerosol until it is evaporated and converted into free atoms.. Iron levels in samples using AAS can be found by measuring the intensity of the radiation that decreases after being transmitted. The reduction in radiation intensity is proportional to the concentration of the sample element in the sample being measured. By testing the t-test, it was found that the AAS instrument was more sensitive to low concentrations
Immobilization of Cerium(IV) Oxide onto Reduced Graphene Oxide in Epoxy Resin Matrix as Radar Absorbing Composite for X-band Region Bolilanga, Patricya Inggrid Wilhelmina; Basuki, Rahmat; Apriliyanto, Yusuf Bramastya; Prasojo, Agus Eko; Lazuardy, Ardyan; Anitasari, Reza; Putri, Riyanti; Sasongko, Nugroho Adi; Santiko, Arief Budi
Indonesian Journal of Chemistry Vol 24, No 6 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.94404

Abstract

The rGO/CeO2/epoxy composite has been successfully prepared as radar absorbing material (RAM) for the X-band (8–12 GHz) region. The reduced graphene oxide (rGO) originated from pencil graphite oxide (GiO) was synthesized through the modified Hummer method. The synthesis of rGO/CeO2/epoxy was conducted by immobilization of cerium(IV) oxide into rGO (rGO/CeO2) via hydrothermal method and followed by composited the rGO/CeO2 with epoxy resin matrix. Morphological analysis by SEM-EDX indicates that the rGO/CeO2 structure appears to be a tangled layer of edges randomly aggregated, and CeO2 is uniformly anchored on the rGO surface. From the diffractogram result of the XRD instrument, rGO exhibits changes in crystallinity, indicating a transformation of the interlayer structure from multilayer GiO to a single layer of rGO. The presence of Ce–O was indicated at wavenumber 553 cm−1 of rGO/CeO2 by FTIR. The microwave absorbing performance of rGO/CeO2/epoxy conducted by vector network analyzer (VNA) showed that the RL value of the composite was −3.22 dB (47% of electromagnetic wave absorption) at a frequency of 9.25 GHz at the thickness of 1 mm composite. The composite has the promising prospect of being developed as a captivating candidate for the new type of microwave absorptive materials.
Reflection Loss Improvement by Cerium Addition in Chitosan-Hydroxyapatite Film as Stealth Drone Candidate Putri, Riyanti; Prasojo, Agus Eko; Lazuardy, Ardyan; Anitasari, Reza; Salsabila, Fidela Aurellia; Sasongko, Nugroho Adi; Apriliyanto, Yusuf Bramastya; Hasibuan, Anggi Khairina Hanum; Ananda, Dea Dwi
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.v4i1.53

Abstract

Radar is a detection and tracking technology commonly applied to monitor environmental conditions. Its ever-growing capabilities pose a serious challenge to military operations because they increase the risk of being detected by the enemy. On the other hand, unmanned aircraft (drones) are increasingly widespread in gathering information. However, the effectiveness of this technology can be reduced due to exposure to radar waves that allow detection. Therefore, developing coating materials that can absorb radar waves is an urgent need to increase the effectiveness of military equipment. The composites developed were derived from chitosan obtained from crustacean waste, hydroxyapatite from eggshell waste, and the rare earth metal cerium obtained from Lapindo Mud. Composites containing cerium metal (Ce) have higher radar signal absorption capabilities than samples without Ce, as evidenced by VNA measurements showing increased absorbance in the 100 MHz - 8.5 GHz frequency range. SEM tests indicate that cerium particles increase the density and homogeneity of the pore structure, with a size range of 17–24 µm. FTIR characterization revealed that Ce was physically bound to the chitosan-HAp composite. Mechanically, the composite with Ce had a maximum tensile stress of 9.512 MPa and a strain of 9.512%, while without the addition of Ce, a stress of 9.529 MPa and a strain of 25.512% was obtained. These findings indicate that integrating rare earth metals in chitosan-HAp composites can improve the material's capability to absorb radar waves, thus having broad prospects for applications in defence technology.
Co-Authors Ananda, Dea Dwi ANGGI KHAIRINA HANUM HASIBUAN Arief Budi Santiko, Arief Budi Bolilanga, Patricya Inggrid Wilhelmina Lazuardy, Ardyan Nugroho Sasongko Jati, Nugroho Sasongko Nurrosyid, Naufan Prasojo, Agus Eko Putri, Riyanti Rahmat Basuki Salsabila, Fidela Aurellia Sijabat, Windy Nelasari Yusuf Bramastya Apriliyanto