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All Journal Berita Kedokteran Masyarakat Scientific Contributions Oil and Gas
Taufiq, Heydar Ruffa
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Chemical Engineering, Chemistry & Bioengineering Energy Nursing Public Health

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Biosmart and safe bus : new approach implementing epidemiologic triangle to reduce pathogen transmission on public transportation Mentari, Alfitra Akbar Bara Mentari; Antari, Arlita Leniseptaria; Saraswati, Indah; Firmanti, Stefani Candra; Subagio, Agus; Prasetyo, Awal; Taufiq, Heydar Ruffa; Rowi, Khasan; Gufron, Ahmad
BKM Public Health and Community Medicine The 12th UGM Public Health Symposium
Publisher : Universitas Gadjah Mada

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Background: Indirect pathogen transmission is one of the factors that cause the transmission of infectious problems from human to human. Surface cabine bus is one of the places that probably can be an intermediary of indirect pathogen transmission. Biosmart and Safe Bus is the concept of implementing an epidemiologic triangle, one of the innovations in Biosmart and Safe Bus is implementing silver nanoparticles as a coating in the cabine to decrease the bacterial load on the surface. Objective: To determine the effectiveness of coating silver nanoparticles in decreasing the bacterial surface load on the Biosmart and Safe Bus concept. Methods: This research used a post-test-only design with a control group. The sampling technique in this research is using surface swab sampling with a total of 18 samples in each Biosmart and Safe Bus and conventional bus that turn to Jakarta and Batu from Semarang. The data were analyzed by using the Mann-Whitney test, the Kruskal-Wallis test, and pairwise comparison Kruskal-Wallis test. Results: The results showed a significant difference between bacterial surface load on Biosmart and Safe Bus and conventional bus (p = 0.015). Along with it, the implementation of coating silver nanoparticles has a considerable effect (cohen effect size = 1.0324) in decreasing the bacterial surface load on the cabin of Biosmart and Safe Bus. The use of silver nanoparticles as a coating on the surface of Biosmart and Safe Bus is effective in being a surface antibacterial agent. This is in line with another research conducted in the United Kingdom with the result that the use of Ag antimicrobial BioCote as coating can reduce 95% surface bacteria. Conclusion: This research proved that coating silver nanoparticles is effective in decreasing the bacterial surface load on Biosmart and Safe Bus compared to a conventional bus.
High Thermal Stability Silica Nanofluids For EOR in Sandstone Reservoir Subagio, Agus; Rowi, Khasan; Ngadiwiyana; Taufiq, Heydar Ruffa; Azis, Muhammad Mufti; Prasetiyo, Bayu Dedi; Sitompul, Victor; Paryoto, Sumadi; Winata, Denie Tirta; Diharja, Tino; Yutaka, Michael Arya; Syarifudin, Abimanyu Putra; Firmansyah, Wahyu; Koestono, Hary
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2000

Abstract

The development of silica nanofluids for enhanced oil recovery (EOR) has gained significant attention. However,  their application is limited bypoor stability under high temperature, and high salinity conditions. Our previous studies demonstrated that using the anionic surfactant alpha olefin sulfonate (AOS) combined with the co surfactant disodium laurent sulfosuccinate (DLS) at consentrations of 0.3% AOS and 0.3% DLS significantly enhanced thermal stabilility, reduced IFT, decreased wettability, and increased incremental oil recovery. This study reports a one step synthesis method for preparing silica nanofluids using hydrophilic colloidal nano silica (CNS) stabilized with the AOS and DLS at surfactant concentrations above 0.3%. Nanofluids were formulated with formation water from a reservoir in Sumatra, Indonesia. We systematically evaluated the effects of AOS-DLS concentrations on the thermal stability, turbidity, interfacial tension (IFT), wettability, filtration test, and core flooding performance. The optimized formulation of stable silica nanofluids for EOR applications under reservoir relevant conditions was also systematically evaluated. The silica nanofluid (0.3% AOS + 0.3% DLS) exhibited more than 3 months of stability at 60 °C. It also had a low contact angle of 13.88 ͦ and a reduced IFT of 6.3x10-1 mN/m. The filtration ratio was 1.2. Spontaneous imbibition resulted in a recovery factor (RF) of 59%. Core flooding analysis yielded an incremental RF of 12.9% of the OOIP. These results demonstrate the synergistic role of silica nanoparticles and surfactants in improving nanofluid stability, reducing IFT, and enhancing oil recovery. This supports their potential application in chemical flooding for sandstone reservoirs.
Co-Authors Agus Subagio Antari, Arlita Leniseptaria Awal Prasetyo Diharja, Tino Gufron, Ahmad Indah Saraswati Khasan Rowi Koestono, Hary Mentari, Alfitra Akbar Bara Mentari Muhammad Mufti Azis Ngadiwiyana Paryoto, Sumadi Prasetiyo, Bayu Dedi Sitompul, Victor Stefani Candra Firmanti Syarifudin, Abimanyu Putra WAHYU FIRMANSYAH Winata, Denie Tirta Yutaka, Michael Arya