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All Journal Jurnal Ilmu Dasar Journal of the Medical Sciences (Berkala Ilmu Kedokteran) Jurnal Sains Dasar Jurnal Spektra JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Communications in Science and Technology Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Jurnal Ilmu Fisika Jurnal Fisika Indonesia Jurnal Teras Fisika : Teori, Modeling, dan Aplikasi Fisika Jurnal Polimesin
Agung Bambang Setio Utomo
Universitas Gadjah Mada
Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Neuroscience Physics

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Analisa Kinerja Pompa Kalor Termoakustik Pada Frekuensi Harmonik Orde 1, 3, 5 dan 7 Menggunakan Stack Berpori Lingkaran Agus Cahyono; Wahyu Nur Achmadin; Ikhsan Setiawan; Agung Bambang Setio Utomo
Jurnal Fisika Indonesia Vol 23, No 1 (2019)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v23i1.54331

Abstract

Telah dilakukan penelitian tentang kinerja pompa kalor termoakustik, meliputi laju pemanasan dan pendinginan, menggunakan tabung resonator dengan panjang 70 cm dan diameter 4,6 cm pada frekuensi harmonik orde 1, 3, 5 dan 7. Stack yang digunakan dari bahan plastik dengan panjang 10 cm dan pori-pori bentuk lingkaran berdiameter tertentu. Hasil penelitian menunjukkan bahwa perbandingan beda suhu optimum antara bagian panas dan dingin untuk frekuensi harmonik orde pertama, ketiga, kelima dan ketujuh adalah 27:9:3:1.
Pengaruh Stack Berbahan Alami (Serat Nanas) dan Non-Alami (Benang Wool) Pada Sistem Pendingin Termoakusti Qonitatul Hidayah; Putih Asmara; Ikhsan Setiawan; Agung Bambang Setio Utomo
Jurnal Fisika Indonesia Vol 24, No 2 (2020)
Publisher : Department of Physics Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfi.v24i2.54333

Abstract

Telah dilakukan penelitian mengenai pengaruh stack bahan alami (serat nanas), dan bahan non-alami (benang wool) serta diberi penukar kalor tambahan yang dialiri air. Adapun Resonator yang digunakan berbentuk silinder dengan satu ujung tertutup, sedangkan ujung terbukanya dihubungkan dengan loudspeaker yang menyediakan gelombang bunyi (sistem standing wave). Hasil yang diperoleh adalah bahwa telah terjadi perubahan suhu pada tandon di kiri-kanan stack serat nanas (bahan alami), atau benang wool (bahan non-alami) yang kemudian disebut tandon panas dan dingin. Penurunan suhu tandon dingin terbesar menggunakan jenis stack serat nanas (6 cm) dengan penurunan suhu sebesar (11,2 ± 0,1) ◦C, dan stack benang wool sebesar (13,6 ± 0,1) ◦C. Dengan demikian telah terwujud sebuah pendingin termoakustik menggunakan stack serat nanas dan benang wool serta penukar kalor tambahan yang dialiri air dalam rangka meningkatkan kinerja sistem.
Analisis struktur morfologi membran kitosan/PEO dan kitosan/PEG4000 Kartika Sari; Sunardi Sunardi; Agung Bambang Setio Utomo; Edi Suharyadi; Evvy Kartini; Evi Yulianti
Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika Vol 3 No 1 (2020): Jurnal Teras Fisika: Teori, Modeling, dan Aplikasi Fisika
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jtf.2020.3.1.2756

Abstract

Pembuatan dan pengujian membran kitosan/PEO dan kitosan/PEG4000 dilakukan bertujuan untuk membandingkan struktur morfologi dan gugus fungsi yang dihasilkan dari membran kitosan/PEO dan kitosan/PEG4000. Pembuatan membran Kitosan/PEO dan kitosan/PEG4000 dilakukan dengan metode solution casting. Karakterisasi dilakukan menggunakan FTIR (Fourier Transform Infra Red) dan SEM (Scanning Electron Microscopy). Hasil FTIR membran kitosan, kitosan/PEO dan kitosan/PEG4000 menunjukkan adanya interaksi gugus fungsi –OH dan C-H di dalam membran kitosan/PEO dan kitosan/PEG4000. Bilangan gelomgang 1500 – 945 cm-1 terbentuk ikatan bending antara gugus fungsi C-C dan –NH3. Hasil SEM menunjukkan terbentuk agglomerasi dengan bertambahnya PEO dan PEG4000 pada larutan. Agglomerasi terjadi homogen di permukaan membran menunjukkan adanya pengaruh penambahan PEO dan PEG4000 pada pembentukan membran sehingga menghasilkan ikatan antar atom yang semakin renggang/tidak stabil. Hasil membran kitosan/PEO dan kitosan/PEG4000 dapat digunakan sebagai polimer elektrolit padat.
SIFAT OPTIK DAN PERMITIVITAS LISTRIK MEMBRAN POLIMER PADAT KITOSAN/PEO Kartika Sari; Sunardi Sunardi; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Evi Yulianti; Mashadi Mashadi
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 17 No. 2 (2020): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v17i2.4987

Abstract

Synthesis and characterization of the chitosan/PEO solid polymer membranes were carried out to determine the morphological structure, crystal structure and functional groups. Synthesis of the chitosan/PEO solid polymer membrane was carried out by solution casting method. Characterization was performed using the FTIR (Fourier Transform Infra Red), XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy) and EIS (Electrochemical Impedance Spectroscopy). The FTIR results showed that the chitosan/PEO solid polymer membrane interacted with the –OH and C-H functional groups at wave numbers 1500 - 945 cm-1 and formed a bending bond between functional groups  of the C-C and –NH3. The SEM results showed that the homogeneous agglomeration was formed on the membrane surface due to the addition of PEO powder. This causes the formation of bonds between atoms to unstable. The XRD results obtained that the chitosan/PEO solid polymer membrane pattern tended to have a semicrystalline structure. The graph of the EIS results shows the electric permittivity does not form a semicircular arc. There was no grain response on the chitosan / PEO solid polymer membrane. The results of SEM, XRD, FTIR and EIS characterization show that chitosan /PEO solid polymer membranes can be used as an alternative to solid polymer electrolytes.
Kajian Hasil Pengujian X-Ray Diffraction (XRD) Dan Konstanta Dielektrik Membran Polimer Kitosan/PEG4000 dengan Lithium Triflat (LiCF3SO3) Kartika - Sari; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala Khoryanton
Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam Vol. 18 No. 2 (2021): Sainmatika : Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam
Publisher : Universitas PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/sainmatika.v18i2.6717

Abstract

Synthesis and testing of chitosan/PEG4000 solid electrolyte polymer membrane with LiCF3SO3 salt as a surfactant was carried out to determine crystalline size and type of structure using X-Ray Diffraction (XRD) and dielectric constant using Electrochemical Impedance Spectroscopy (EIS). The manufacture of chitosan/PEG4000 electrolyte polymer membrane with LiCF3SO3 salt using the solution casting method. The samples used in the XRD and EIS tests were in the form of solid electrolyte polymer membranes of chitosan, chitosan/PEG4000 and chitosan/PEG4000 with LiCF3SO3 salt. XRD test showed that the crystalline size of the chitosan, chitosan/PEG4000, and chitosan/PEG4000 electrolyte polymer membranes with LiCF3SO3 salt experienced a 2θ angle shift and formed a semicrystalline phase. The peak intensity increase occurred after chitosan was added with PEG4000 with LiCF3SO3 salt. The crystalline size obtained for the electrolyte polymer membrane of chitosan, chitosan/PEG4000 and chitosan/PEG4000 salt LiCF3SO3 was 4,002 nm; 2,474 nm and 4,183 nm. Meanwhile, the type of structure produced by chitosan, chitosan/PEG4000 and chitosan/PEG4000 electrolyte polymer membranes with LiCF3SO3 salt is a semicrystalline phase. The dielectric constant for solid electrolyte polymer membranes of chitosan/PEG4000, and chitosan/PEG4000 with LiCF3SO3 salt are 3,4 and 16,6 x 103. XRD and EIS test results show that chitosan/PEG4000 polymer membrane with LiCF3SO3 salt as a surfactant can be applied as an alternative to solid electrolyte polymer secondary batteries.
Natural Dyes as a Photosensitizer from Dragon Fruit (Hylocereus polyrhizus) for Dye-Sensitized Solar Cells Kartika Sari; Sunardi sunardi; Dita Asa Panunggul; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala Khoryanton
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3082

Abstract

Natural Dye is one of the important materials of DSSC which absorbs photons from the sun’s rays and transmits the photoelectron. One of the natural dyes is Dragon fruit dye. The characterization of the optical and electrical properties of a sensitizer DSSC used a UV-Vis spectrometer, FTIR spectrometer, and solar power meter. The absorption spectra of the UV-Vis spectrometer are being measured by a wavelength range of  400 – 700 nm and show a maximum peak of 535 nm. The result of the FTIR spectrometer shows the functional group of  H-bond stretching, C=O, and C-O-H stretching vibrations.  It is a part of anthocyanin and chlorophyll.  Zinc Oxide (ZnO) paste coated on the Indium Tin Oxide (ITO) as the thin film is dipped in the Dragon fruit dye extracted for 30 hours. Thin film is prepared as the working electrode and counter electrode. The characteristic of current and voltage (I-V) as electrical properties are measured by the solar power meter.  The result of the current and voltage DSSC from Dragon fruit dye extracted coated ZnO obtained, indicated that the energy bandgap could be optimized to make a wide bandgap. ZnO thin film needs the Dragon fruit dye to decrease the surface and move electrons in the bandgap. The Dragon fruit dye extracted coated ZnO thin film could be used as a sensitizer since it will increase the correlation between the ZnO thin film and dye. And the last, it will improve the quality of solar cells as well.
The Synthesized-Hydroxyapatite Powder from Anadara Granosa Shells using Deposition Time Method for Biomedical Applications Sunardi, Sunardi; A’yun, Nidha Aulia Qurrata; Dari, Qorinah Wulan; Aminuddin, Jamrud; Bilalodin, Bilalodin; Praktino, Budi; Yulianti, Evi; Utomo, Agung Bambang Setio; Sari, Kartika
Jurnal Ilmu Fisika Vol 16 No 1 (2024): March 2024
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.16.1.88-96.2024

Abstract

Hydroxyapatite (HAp) powder, one of the biomaterials derived from natural sources, could be used in biomedical applications. In this research, the synthesized-HAp powder from Anadara Granosa shells as raw materials had a high calcium carbonate content with variations in deposition time using the precipitation method. Variations of deposition time used were 0 (S0), 24 (S24), and 48 (S48) hours. Fourier Transform Infrared (FTIR), X-Ray Diffractions (XRD), and Scanning Electron Microscopy (SEM) were used to investigate the chemical structure, phase analysis, and morphology of the synthesized HAp powder. FTIR results of the S0, S24, and S48 showed that the functional groups ,  and were formed at variations in the deposition time. The XRD results showed that the smallest of crystallite size of S48 was 26.03 nm, and the crystallinity degree of S24 was 38.74%. The grain dispersity of the synthesized-hydroxyapatite powder from SEM results were uniform, agglomeration, and spherical, irregular shape. The Ca, P, Mg, and Si compositions were shown in the synthesized-hydroxyapatite powder. The deposition time affects the synthesized-Hydroxyapatite (HAp) powder from the Anadara Granosa shell, and it is a potential raw material for biomedical applications.
Modification of Chitosan/PEG4000 dispersed with Lithium Triflate (LiCF\(_3\)SO\(_3\)) as a solid polymer electrolyte for the secondary battery Sari, Kartika; Haryadi, Arifin Nur Muhammad; Khusaenah, Nur; Sudaryanto; Yulianti, Evi; Utomo, Agung Bambang Setio
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1496

Abstract

Secondary battery solid electrolytes attract researchers' attention for being one of the components of the anode and cathode separation in batteries. Currently, battery electrolytes on the market are liquid-based, which have weaknesses in their safety and are not environmentally friendly. Solid-based electrolytes can be a good choice since they excel in the safety and stability of mechanical and electrical properties; however, they still have the disadvantage of low conductivity values (~10-4 - 10-6 S/cm), thus requiring modification. The solid electrolytes modification using chitosan can be done by adding other polymers and salts as fillers and Li+ ion-making agents. This scientific paper offers an overview of the development of chitosan-based secondary battery solid electrolytes with the addition of PEG4000 polymer and LiCF3SO3. The study was conducted using the solution casting method producing solid electrolytes in the form of membranes. The addition of PEG4000 and LiCF3SO3 affected the microstructure and electrical permittivity of the polymer solid electrolyte membrane. PEG4000 as a plasticizer had no significant effect on inter- and intra-molecular bonds due to poor membrane homogeneity; meanwhile, LiCF3SO3 could increase the permittivity and ionic conductivity of the chitosan polymer solid electrolyte membrane to 3.199 x 10-7 S/cm. The chitosan polymer solid electrolyte membrane with the addition of PEG4000 and 30% LiCF3SO3 salt has an optimal value compared to other salt concentration variations. The results of this research concluded that LiCF3SO3 is evenly dispersed in the chitosan/PEG4000 solid polymer electrolyte membrane enabling it to be used as a secondary battery solid electrolyte.
Effect of palm fiber volume fraction for enhancing the physical and mechanical properties of epoxy composites Kartika Sari; Sunardi -; Yazid Zainur Isnen; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala - Khoryanton
Jurnal Polimesin Vol 23, No 1 (2025): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i1.5692

Abstract

Reinforcing materials such as fiber; are most widely used to give new properties to composites. This study investigates the effect of palm fiber (Arenga pinnata) volume fraction on the physical and mechanical properties of epoxy-based composites. Composite specimens with 0% and 2.5% fiber volume fractions were fabricated, maintaining a uniform thickness of 2 mm. The fabrication process involved fiber extraction, mixing with epoxy resin, and controlled curing. The physical properties assessed included density, porosity, and water absorption, while mechanical testing involved tensile and bending tests. The results demonstrated that the 2.5% fiber-reinforced composite exhibited improved properties compared to the 0% fiber composite. The density increased from 5.85 g/cm³ to 13.43 g/cm³, while porosity and water absorption rose slightly to 0.40% and 0.03%, respectively. In mechanical testing, the tensile strength increased from 2.64 MPa to 6.29 MPa, while strain improved from 1.06% to 4.59%. Young’s modulus, however, decreased from 2.49 MPa to 1.37 MPa, indicating enhanced flexibility. The bending stress increased from 6.35 MPa to 10.85 MPa, and deflection improved from 1.45 mm to 7.35 mm. These findings indicate that incorporating 2.5% palm fiber provides an optimal balance between strength and flexibility, making it a promising reinforcement for lightweight composite applications.
Properties of Pineapple Leaf Fibers with Paper Waste as An Absorbing-Composite to Reduce Noise Sari, Kartika; Isnen, Yazid Zainur; Utomo, Agung Bambang Setio; Sunardi, Sunardi
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 11 No 2 (2022): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v11i2.12356

Abstract

Natural product-based noise-absorbing composite can be an alternative to replace synthetic fiber because of its advantages of high strength, toughness, low price, and abundance to reduce noise. The materials used were pineapple leaf fibers with paper waste. This research aims to study the advantage of natural products to reduce noise by analyzing the coefficient of sound absorption and impact strength to evaluate the absorbing composite. The composites were tested with the Charpy method with ISO 11654 standard and ASTM E23 for sound absorption and impact strength. Sound absorption was carried out using an impedance tube at a frequency range of 250 – 3000 Hz. The volume fraction of pineapple leaf fibers, paper waste, and resin epoxy concentrations were 20% : 30% : 50%, 25% : 25% : 50%, and 30% : 20% : 50%. The thickness for the sound absorption coefficient was 2 cm and 3 cm, while the thickness of the impact strength was 0.5 cm. The highest sound absorption coefficient of pineapple leaf fibers composite for 30% : 20% : 50% volume fraction was 0.788 for sample 2 cm. The highest impact strength for 20% : 30% : 50% volume fraction of the thickness of 0.5 cm was 3.527 J/mm2. The results of the sound absorption coefficient will increase if used more pineapple leaf fibers but it will decrease the impact strength. Based on this research, the pineapple leaf fibers will improve the quality of the composite that can be used as a sound-absorbing material as well. These materials possess the promising potential to decrease waste and are used in industries for a low cost.
Co-Authors . Kusminarto Adhika Widyaparaga Agus Cahyono Aminuddin, Jamrud Ampala - Khoryanton Ampala Khoryanton Ampala Khoryanton A’yun, Nidha Aulia Qurrata Bambang Irawan Bambang Murdaka Eka Jati Bilalodin Bilalodin Dari, Qorinah Wulan Dita Asa Panunggul Edi Suharyadi Evi Yulianti EVI YULIANTI Evi Yulianti Evvy Kartini Guntur Maruto Hans Helmut Telle Haryadi, Arifin Nur Muhammad Hedwigis Harindra Ikhsan Setiawan Ikhsan Setiawan Ikhsan Setiawan Ikhsan Setiawan Ikhsan Setiawan Isnen, Yazid Zainur Jamhari Jamhari Jayawarsa, A.A. Ketut Kartika Sari Kartika Sari Kartika Sari Kartika Sari Khusaenah, Nur Kusminarto - Makoto Nohtomi Makoto Nohtomi, Makoto Mashadi Mashadi Mitrayana - Parmin Lumban Toruan Parmin Lumban Toruan Parmin Lumbantoruan Pekik Nurwantoro Praktino, Budi Prastowo Murti Prastowo Murti Prastowo Murti, Prastowo Putih Asmara Qonitatul Hidayah Sholihun, Sholihun Sudaryanto Sunardi - Sunardi Sunardi sunardi sunardi Sunardi Sunardi Sunardi sunardi Sunardi Sunardi Supardi Supardi W N Achmadin Wahyu Nur Achmadin Yazid Zainur Isnen Yosef Robertus Utomo Yosi Aprian Sari Yumnawati Yumnawati