Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal JURNAL KIMIA SAINS DAN APLIKASI
Tri Windarti
Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
The Effect of Calcination Temperature on the Characteristics of CeO₂ Synthesized Using the Precipitation Method Zidan Alfian Bahtiar; Tri Windarti; Dwi Hudiyanti
Jurnal Kimia Sains dan Aplikasi Vol 27, No 5 (2024): Volume 27 Issue 5 Year 2024
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.27.5.226-231

Abstract

Cerium oxide (CeO2) was synthesized using the precipitation method at various calcination temperatures ranging from 500 to 700°C. Cerium(III) nitrate hexahydrate (Ce(NO)3.6H2O) was used as the precursor for cerium, while Cetyltrimethylammonium bromide (CTAB) acted as the morphology-directing agent. Characterization results indicated that pure CeO2 was obtained at all calcination temperature variations. Calcination temperature influences crystallinity, crystal size, and CeO2 crystal parameters. The crystallinity and crystal size of CeO2 increased with the rising calcination temperature, reaching values of 81.1–84.5% and 15.58–23.12 nm, respectively, along with larger crystal parameters as the temperature increased (a = 5.406–5.410 Å). Surface morphology showed irregular shapes of CeO2 particles, with decreasing sizes as the calcination temperature increased, ranging from 0.2-5.6 μm at 600°C to 0.12-2.9 μm at 700°C. The Ce/O ratio on the surface increased with the rising calcination temperature, reaching a range of 0.48–0.57. CeO2 obtained from calcination at 600°C exhibited the highest fluorescence emission intensity (λ= 496 nm), indicating the least oxygen vacancies presence. Therefore, for antioxidant and catalyst applications, it is preferable to calcinate CeO2 at 700°C.
The Release of Curcumin from β-TCP/SiO₂/Curcumin Composites in a Ringer’s Lactate Solution Tri Windarti; Ngadiwiyana Ngadiwiyana; Fadila Fibriani
Jurnal Kimia Sains dan Aplikasi Vol 29, No 5 (2026): Volume 29 Issue 5 Year 2026
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.29.5.373-378

Abstract

Osteoporosis is characterized by bone deterioration caused by high levels of reactive oxygen species (ROS), which inhibit osteoblast activity and lead to a decrease in bone density. Adding curcumin, a natural antioxidant, to calcium phosphate cement (CPC) enhances its function beyond simply increasing bone density. In this study, CPC was prepared from a β-tricalcium phosphate (β-TCP, β-Ca3(PO4)2) composite with curcumin. To enhance the interaction between β- TCP and curcumin, silicon dioxide (SiO2) was added. β-TCP was synthesized by the sol-gel method, with SiO2 content ranging from 1.6 to 8.3%. CPC preparation was carried out using a 2.5% Na2HPO4 solution. The release of curcumin in a Ringer’s lactate solution was studied in relation to the role of SiO2. The UV-Vis spectral intensity of the remaining Ringer’s lactate solution after soaking decreased as the SiO2 content increased. Results from a five-day soaking period showed that β-TCP did not transform into hydroxyapatite, but rather experienced a decrease in crystallinity and average crystal size from 96.175% to 25.524% and from 58.335 nm to 39.474 nm, respectively. Therefore, it can be predicted that CPC can maintain the presence of curcumin in a physiological environment.
Co-Authors Dwi Hudiyanti Fadila Fibriani Ngadiwiyana Ngadiwiyana Zidan Alfian Bahtiar