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All Journal International Journal of Public Health Science (IJPHS) Reaktor BULETIN OSEANOGRAFI MARINA BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL SISTEM INFORMASI BISNIS Jurnal Sains Materi Indonesia YOUNGSTER PHYSICS JOURNAL Jurnal Riset Kimia JURNAL KESEHATAN LINGKUNGAN (Journal of Environmental Health) Jurnal Ilmiah Arena Tekstil Jurnal Biodjati Indonesian Journal of Chemistry Journal of Physics and Its Applications Buletin Anatomi dan Fisiologi (Bulletin of Anatomy and Physiology) Jurnal Fisika Indonesia ASEAN Journal of Chemical Engineering Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Cahaya Mandalika Greensphere: Journal of Environmental Chemistry Makara Journal of Science Berita Kedokteran Masyarakat Riwayat: Educational Journal of History and Humanities Jurnal Sains Materi Indonesia Inovate : Jurnal Ilmiah Inovasi Teknologi Informasi Scientific Contributions Oil and Gas
Agus Subagio
Department Of Physics, Faculty Of Science And Mathematics, Universitas Diponegoro, Semarang
Aerospace Engineering Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Synergy of Nano Silica and Anionic Surfactant Fluid as Chemical Enhanced Oil Recovery Rowi, Khasan; Subagio, Agus; 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 48 No 4 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i4.1951

Abstract

Silica nanofluids attract significant attention for enhanced oil recovery (EOR) applications due to their ability to alter rock wettability. However, silica nanofluids exhibit limitations in thermal stability. The addition of anionic surfactants aims to overcome these limitations. The synergisticAnionic surfactants are added to address the thermal stability issues of silica nanofluids. The synergy interaction between silica nanoparticles (SNPs) and anionic surfactants enhances  wettability alteration, reduces interfacial tension (IFT), improves thermal stability, and increasing oil recovery. This study investigates the synergistic effects of SNPs, alpha olefin sulfonate (AOS) surfactant, and disodium laureth sulfosuccinate (DLS) co-surfactant in nanofluid formulations applied to sandstone reservoirs. Laboratory experiments employ colloidal nano silica with two particle sizes, 8 nm (SNP-01) and 3 nm (SNP-02), combined with AOS-DLS anionic surfactants at various concentrations . The study showed that the silica nanofluid remains stable for up to 3 months at temperatures below 80°C for both SNP types at a concentration of 0.1% with surfactant concentrations 0.3% AOS and 0.3% DLS in  3% brine solution. The addition of SNPs decreases the contact angle, whereas surfactants do not significantly affect the contact angle; however, surfactant effectively reduce the IFT, while  nano silica shows minimal influence on IFT values. Core flooding analysis showed that the SNP-02 nanofluid produced the highest recovery factor of 12.1% OOIP. Futhermore, SEM analysis showed that silica nanofluid injection removes surfactant impurities and enhances rock porosity.
Analysis Effect of Nano Chitosan Coating on The Quality of Shallot Bulbs (Allium ascalonicum L. var. Bauji) Della Widya Puspita; Erma Prihastanti; Sri Widodo Agung Suedy; Agus Subagio
Jurnal Biodjati Vol 7 No 1 (2022): May
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/biodjati.v7i1.14900

Abstract

Shallots are bulb-shaped commodities that are difficult to maintain in new conditions because they are easily damaged. An effective effort to prevent deterioration of food quality during storage is by coating it using nano chitosan. The effectiveness of nano chitosan is influenced by particle size which related to the ratio of chitosan and STPP (sodium tripolyphosphate). This study aimed to determine the effect of nano chitosan coating with the addition of different ratios of chitosan and STPP and the appropriate ratio of chitosan and STPP on nano chitosan as a coating to maintain the quality of shallot bulbs (Allium ascalonicum L. var. Bauji). This study used a completely randomized design (CRD) method with four treatments and five replications. The treatments of this research were P0= Control, PI= Nano chitosan ratio of chitosan: STPP 1:3, P2= Nano chitosan ratio of chitosan:STPP 1:4, and P3= Nano chitosan ratio of chitosan:STPP 1:5. The variables of this study were the percentage of damage, the percentage of diameter shrinkage, weight loss, color, hardness, and moisture content. Data were analyzed using the ANOVA test and continued with the DMRT test. The application of nano chitosan coating on shallot bulbs could reduce damage, shrinkage of tuber diameter, weight loss, color, hardness, and decrease in water content better than the control treatment. The best results were shown by treatment P3 (1:5) with a percentage of damage of 8%, diameter shrinkage of 20.20%, weight loss of 18.40%, total color change of 54.45, hardness of 226.23 N, and a decrease in water content of 4.65% at the final water content of 79.09%.
FABRIKASI FILM TIPIS SEMIKONDUKTOR FEROMAGNETIK TiO2-Co DENGAN TEKNIK MOCVD DAN PENGAMATAN MAGNETORESISTANSI Edy Supriyanto; Horasdia Saragih; Agus Subagio; Maman Budiman; Pepen Arifin; Moehammad Barmawi; Sukirno Sukirno
Jurnal Sains Materi Indonesia Vol. 7 No. 4 (2006): Edisi Khusus
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jusami.2006.0.0.5180

Abstract

FABRIKASI FILM TIPIS SEMIKONDUKTOR FEROMAGNETIK TiO2-Co DENGAN TEKNIK MOCVD DAN PENGAMATAN MAGNETORESISTANSI. Film tipis TiO2-Co telah berhasil ditumbuhkan di atas subtrat Si dengan teknik MOCVD. Film tipis TiO2-Co bersifat feromagnetik pada suhu ruang, dan memiliki respon magnetik lunak (soft magnetic). Penggunaannya sebagai material injektor pada divais spintronika berstruktur TiO2-Co/Si/TiO2-Co, diinvestigasi. Karakteristik arus-tegangannya, tanpa dan dengan medan magnetik luar, dianalisa. Teramati adanya pengaruh magnetik terhadap resistansi divais yang disebut sebagai magnetoresistansi. Magetoresistansi diperoleh bergantung pada besarnya tegangan bias yang diberikan pada divais. Penambahan tegangan ke suatu nilai tertentu dapat menghilangkan efek magnetoresistansi.
STUDI PENGARUH KONSENTRASI AL PADA STRUKTUR KRISTAL DAN MORFOLOGI FILM TIPIS AlxGa1-xN/Si(111) YANG DITUMBUHKAN DENGAN TEKNIK PA-MOCVD Heri Sutanto; Agus Subagio; Edy Supriyanto; Pepen Arifin; Sukirno Sukirno; Maman Budiman; Moehamad Barmawi
Jurnal Sains Materi Indonesia Vol. 7 No. 4 (2006): Edisi Khusus
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jusami.2006.0.0.5183

Abstract

STUDI PENGARUH KONSENTRASI AL PADA STRUKTUR KRISTAL DAN MORFOLOGI FILM TIPIS AlxGa1-xN/Si(111) YANG DITUMBUHKAN DENGAN TEKNIK PA-MOCVD. Film tipis AlxGa1-xN telah ditumbuhkan di atas substrat Si tipe-p dengan menggunakan teknik PA-MOCVD. Film tipis AlxGa1-xN ditumbuhkan dengan parameter-parameter: suhu substrat, laju alir N2, TMGa dan TMAl berturut-turut sebesar 700 oC; 90 sccm; 0,1 sccm dan 0,01sccm hingga 0,04 sccm. Film polikristal AlxGa1-xN yang ditumbuhkan mempunyai struktur heksagonal dengan bidang difraksi dominan (1010) dan (1011) hingga konsentrasi Al sebesar 6,78%. Diperoleh nilai kekasaran permukaan film dari pengukuran SPM pada range 11,44 nm sampai dengan 27,20 nm. Morfologi permukaan film semakin halus dengan peningkatan konsentrasi Al pada film. Penurunan nilai konstanta kisi hasil pengujian XRD terjadi karena kekosongan nitrogen pada film. Peningkatan konsentrasi Al pada film menyebabkan penurunan laju penumbuhan film tipis AlxGa1-xN yang terbentuk.
Co-Authors Adi Darmawan Adithia, Rizky Putra Agung Cahyono Agus Setyawan Ahmad Aviv Mahmudi Anghistra, Pradipta Ditya Annisa Fadillah Antari, Arlita Leniseptaria Ari Udijono Aslam Fatkhudin Awal Prasetyo Bagoes Widjanarko Bayu Surarso Della Widya Puspita Diharja, Tino Ditalistya, Tabah Djalal Er Riyanto Dwi Sutiningsih Edy Supriyanto Efiyanti, Lisa Eko Hidayanto Eny Enawaty Erma Prihastanti Febio Dalanta Gufron, Ahmad Hadi Endrawati Halida Halida Hella Arofah Hendri Widiyandari Hendri Widiyandari Hendri Widyandari Heri Sutanto Hermin Pancasakti Kusumaningrum Horasdia Saragih I Gusti Ngurah Antaryama I Nurhasanah Iis Nurhasanah Imam Misbach Indah Saraswati Indras Marhaendrajaya Indri Yuliastuti, Indri Jatmiko Endro Suseno Joko Sudarto Karimah, Putri Diah Wahyu Khasan Rowi Khasan Rowi Koestono, Hary M F Taftiari M. Imam Taufiq Maman Budiman Maman Budiman Marinu Waruwu Mashuri, Chamdan Mateus Sakundarno Adi, Mateus Sakundarno Maulidanir Rohman Mentari, Alfitra Akbar Bara Mentari Metri Setyaningsih Metri Setyaningsih Moch. Abdul Mukid Moehamad Barmawi Moehamad Barmawi Moehammad Barmawi Moehammad Barmawi Mohammad Muhriz Muckharom, Ahmad Ali Muhammad Iskandar Zulkarnain Muhammad Mufti Azis Muhammad Nur Muhammad Zainuri Mursid Raharjo Musni Ahyani Musni Ahyani, Musni Mustafid Mustafid Ngadiwiyana Ngadiwiyana M.Si. S.Si. Ngurah Ayu Ketut Umiati Nissa Kusariana Nurwijayanti Pardoyo Pardoyo Pardoyo, Paryoto, Sumadi Pepen Arifin Pepen Arifin Prasetiyo, Bayu Dedi Priyono Priyono Priyono, R Hidayatuloh R. Yudianti Redemtus Heru Tjahjana Rike Yudianti Rike Yudianti Rini Budihastuti Ririn Sulpiani Rizky Bimanda Sakti Romi Buana Puja Pangestu Satriyo Adhy Silviana Silviana Siti Nandiyah, Siti Sitompul, Victor Skolastika Dara Sabatini Sri Eny Suharini, Sri Eny Sri Widodo Agung Suedy Stefani Candra Firmanti Subhan Subhan Subhan, Sudarno Sudarno Sudarto, Joko Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno Sukirno SULISTIYANI SULISTIYANI Syarifudin, Abimanyu Putra Tatang Wahyudi Tatang Wahyudi, Tatang Taufiq, Heydar Ruffa Tri Windarti Udi Harmoko Vincensius Gunawan S.K. WAHYU FIRMANSYAH Weni Safitri Widianingsih Widianingsih Winata, Denie Tirta Yani. T, Ahmad Yohana Maya Kartikaratri Yundari, Yundari Yutaka, Michael Arya Yuvita Muliastuti