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All Journal JURNAL KIMIA SAINS DAN APLIKASI Berita Kedokteran Masyarakat
Khasan Rowi
Jurusan Kimia, Fakultas Sains dan Matematika, Universitas Diponegoro
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Nursing Public Health

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Improved Thermal Stability of Silica Nanofluids Using Anionic Surfactants for Enhanced Oil Recovery Applications Rowi, Khasan; Ngadiwiyana, Ngadiwiyana; Subagio, Agus
Jurnal Kimia Sains dan Aplikasi Vol 28, No 5 (2025): Volume 28 Issue 5 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.5.244-251

Abstract

Silica nanoparticles have shown great potential in the oil and gas industry sector, especially in applications for enhanced oil recovery. Silica nanofluids are widely used in EOR applications because they are inexpensive, easy to synthesize, environmentally friendly, can be surface modified, and provide high oil recovery rates. However, silica nanofluids have drawbacks in thermal stability and salinity at high temperatures, adversely affecting their application in oil reservoirs. In this paper, the effects of a surfactant sulfonate compound (SPU11) and a co-surfactant sulfosuccinate compound (SPU22) on the thermal stability of silica nanofluids at temperatures ranging from 60 to 100°C were investigated. Next, the silica nanofluids were analyzed for particle size using a particle size analyzer (PSA), wettability using a sessile drop contact angle, and oil recovery capacity using a core flooding test. The results showed that the silica nanofluid with 0.3% SPU11 and 0.3% SPU22 surfactant showed good thermal stability below 80°C for 3 months in 3 wt% brine; PSA analysis showed that the aggregate diameter was 52.86 nm; wettability analysis showed that the silica nanofluid had a contact angle of 60.8° to 36.6° and the core flooding results of silica nanofluid showed an oil in place recovery (OOIP) of 9.7%.
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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Abstract

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.
Co-Authors Agus Subagio Antari, Arlita Leniseptaria Awal Prasetyo Gufron, Ahmad Indah Saraswati Mentari, Alfitra Akbar Bara Mentari Ngadiwiyana M.Si. S.Si. Stefani Candra Firmanti Taufiq, Heydar Ruffa