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All Journal TEKNIK Al-Kimia Makara Journal of Science JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR)
Juwono, Ariadne Lakshmidevi
Departemen Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Engineering Materials Science & Nanotechnology

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 1 
Analysis of Pelvic Bone of Ovariectomized Rats using Infrared and Raman Spectroscopies Fitriyawardhani, Nurwentari Dyah; Juwono, Ariadne Lakshmidevi; Mulyaningsih, Neng Nenden
Makara Journal of Science Vol. 26, No. 1
Publisher : UI Scholars Hub

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Abstract

Osteoporosis is a bone disease that generally occurs in postmenopausal women. Osteoporosis can be studied using an animal model such as rats because rat bone structure is similar to human bone structure. This research aimed to analyze pelvic bones of ovariectomized rats that showed osteoporosis signs for the first time. In this study, 20 Rattus norvegicus were given ovariectomy at 12 weeks of age and were used as an animal model for menopausal women. The rats were euthanized every 2 weeks from 13 to 21 weeks of age. In addition, the pelvic bones of ovariectomized rats will be analyzed using FTIR and Raman spectroscopy to show the first osteoporosis signs periodically. Results of FTIR and Raman spectroscopy indicated that the pelvic bones of the ovariectomized rats showed the first osteoporosis signs at 17 weeks of age with changes in phosphate and carbonate contents, increased hydroxyl functional groups, reduction of mineral maturity about 7.47%, and reduction of crystallinity about 29.26%. In addition, morphological changes from fine fibers to coarser fibers and reduction of the crystal size and crystallinity index at the angle of 2θ ≅ 25° about 9.29% and 25.18%, respectively, were observed using SEM-EDS and XRD.
Kajian Komposit Berbasis Paduan Logam Magnesium Berpenguat Keramik untuk Aplikasi Ortopedi Franciska Pramuji Lestari; Ika Kartika; Ariadne Lakshmidevi Juwono; Anawati Anawati
TEKNIK Vol. 43, No. 3 (2022): December 2022
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v43i3.46575

Abstract

Komposit berbasis logam Magnesium (Mg) merupakan material maju yang potensial diaplikasikan untuk implan biodegradabel yang bersifat sementara. Mg memiliki sifat biodegradabel, biokompatibel serta memiliki densitas yang mendekati tulang sehingga dapat mengurangi stress shielding antara tulang dan implan. Namun, Mg memiliki laju degradasi yang relatif cepat yang dapat menurunkan sifat mekaniknya di dalam lingkungan fisiologis dan kurangnya sifat bioaktivitas. Di sisi lain, biokeramik yang kerap digunakan sebagai bahan implan tulang dan gigi bersifat bioaktif dan bioinert. Penggabungan Mg dan keramik dapat menjadi sebuah material komposit untuk aplikasi biomedis dengan peningkatan sifat mekanik dan biokompatibilitas serta laju degradasi yang imbang. Dalam kajian ini, dibahas secara komprehensif kemajuan riset material komposit berbasis Mg dengan paduan logam Mg sebagai matriks, berbagai material keramik yang umum digunakan sebagai penguat, fasa-fasa penguatan pada komposit, proses manufaktur serta perlakuan panas pada komposit berbasis magesium. Komposit berbasis Mg menjadi material yang menjanjikan untuk aplikasi biomedis karena kombinasi sifat mekanik yang baik, berat jenis yang rendah, dan kemungkinan untuk mencapai laju korosi yang lebih lambat serta meningkatkan penyembuhan dengan adanya material bioaktif.
Antibacterial Testing on Silver/Zinc Oxide Nanoparticles/Organoclay Reinforced Chitosan Biocomposites Muiz, Lisna Junaeni; Juwono, Ariadne Lakshmidevi; Paputungan, Zulkarnaen; Krisnandi, Yuni Krisyuningsih
Makara Journal of Science Vol. 27, No. 3
Publisher : UI Scholars Hub

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Abstract

Herein, bionanocomposites of chitosan (CS)/silver nanoparticle/organoclay/zinc oxide nanoparticle (CS/Ag/OC/ZnO) were prepared for antibacterial food packaging. This study examines the time variation in the AgNP synthesis method by comparing local (74˗85% deacetylated) and commercial chitosan (75%˗85% deacetylated) as a reducing and capping agent and seeks to reconstruct the optimum ratio formulations of AgNPs and ZnONPs in bionanocomposites for food packaging. The results reveal that the synthesis of AgNPs was successfully carried out using a local chitosan solution as a reducing and capping agent. The CS/Ag/OC/ZnO films exhibit structural, mechanical, and optical properties suitable for food packaging and antibacterial activity on Staphylococcus aureus and Escherichia coli. The relative inhibition zone increased with increasing numbers of AgNPs and ZnONPs. The inhibition zone values indicated that E. coli and S. aureus bacteria were sensitive to the film, namely 12.5 ± 1.5 mm, and 16 ± 0.0 mm, respectively.
SIFAT TERMO-VISCOUS RESIN FENOLIK DENGAN RASIO MOLAR FORMALDEHID TERHADAP FENOL YANG BERBEDA Juwono, Ariadne Lakshmidevi; Asraf, Ahmedi; Jihad, Bagus Hayatul; Nugraha Thaha, Yudi
Al-Kimia Vol 12 No 2 (2024): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v12i2.50494

Abstract

Phenolic resin is widely used as a matrix in the composite material. Understanding the thermo-viscous properties of the resin is essential because the viscosity is one of the main factors determining the success of the composite material fabrication. In this study, we synthesized the resin with formaldehyde to phenol molar ratio (F/P) of 1.1, 1.2, 1.3, and 1.4 and analyzed their viscosity as a function of temperature from 17℃ to 25℃. It was observed that the plot of the natural logarithm of the viscosity versus the reciprocal of the temperature of the synthesized phenolic resin is linear. Based on the slope of the Arrhenius plot, the Arrhenius energy of activation varies as a function of the F/P value. The resin’s Arrhenius energy of activation with an F/P value of 1.1, 1.2, 1.3, and 1.4 was 88.8 kJ⁄mol, 96.5 kJ⁄mol, 86.1 kJ⁄mol, and 81.4 kJ⁄mol, respectively. Furthermore, the differential scanning calorimetry (DSC) analysis was conducted on all resins. The endothermic reaction due to water evaporation was found to be dominated at a temperature of around 100℃, and the curing reaction peak of all resins took place at 150℃.
Synthesis and Characterization of Amorphous Silica Nanoparticles Production from Indonesia Coal Fly Ash Chambioso, Yugo; Juwono, Ariadne Lakshmidevi; Daulay, Amru
Journal of Chemical Natural Resources Vol. 7 No. 2 (2025): Journal of Chemical Natural Resources (JCNaR)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jcnar.v7i2.23383

Abstract

Coal fly ash an inexpensive waste material rich in silica, is reused as a renewable source and has attracted widespread attention. The sol-gel process was used to synthesize silica nanoparticles based on coal fly ash. Extraction of silica in the form of alkaline sodium silicate using alkali, followed by the formation of silica gel from the neutralization of alkaline sodium silicate with acid. The treated samples were calcined at 450 °C, 650 °C, and 850 °C. The chemical composition, morphology, phase, and silica functional groups of the as-synthesized silica nanoparticle powder were investigated using X-ray fluorescence (XRF), field emission scanning electron microscopy and Electron diffraction spectroscopy (FESEM-EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). Infrared (IR) spectral analysis showed that silica had hydrogen-bonded silanol and siloxane groups. The silica nanoparticles' purity was found to be as high as 97% in their amorphous state, with XRD analysis indicating this due to the broad peak observed in the 20-23° two-theta region, characterised by a spherical shape and a tendency to aggregate into clusters.
Co-Authors Anawati Anawati Asraf, Ahmedi Chambioso, Yugo Daulay, Amru Fitriyawardhani, Nurwentari Dyah Franciska Pramuji Lestari Ika Kartika Jihad, Bagus Hayatul Muiz, Lisna Junaeni Mulyaningsih, Neng Nenden Nugraha Thaha, Yudi Paputungan, Zulkarnaen Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih