Indonesia Conference Directory

Corresponding Author
Prasetya Widodo

Institutions
a) Center for Technology of Radiation Safety and Metrology–National Nuclear Energy Agency, South Jakarta, DKI Jakarta, 12440, Indonesia
b) Health Facilty Safety Center-Ministry of Health Republic of Indonesia, Central Jakarta, DKI Jakarta, 10570, Indonesia
c) Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
*cuk.imawan[at]sci.ui.ac.id

Abstract
A colorimetric method for dosimetry is widely used in irradiator facilities due to its simple measurement method and low cost. These type of dosimeters are made from dyes that are sensitive to radiation. Tartrazine is one of the dyes that are sensitive to gamma radiation and safe because it is a food coloring agent. In this study the results of experiments and characterization of dosimeters made from tartrazine liquid dyes were reported. Tartazine liquid used has a pH of 6. This liquid has been tested for gamma exposure in the dosage range of 5-100 kGy. Moreover, the stability of the color of this liquid has been investigated for storage conditions in light and dark for 21 days. The characterization of the liquid dosimeters was carried out using a UV-Vis spectrophotometer. The optical spectrum of the liquid tartrazine shows absorbance peaks at wavelengths of 430 nm. The value of the absorbance peak gradually decreases with increasing value of the gama irradiation absorbed. The dose response from the liquid dosimeters is quite linear for the gamma dose range of 5-30 kGy on the logarithmic scale. Besides that, the color of the liquid shows good stability in light and dark storage conditions. Based on these results it can be concluded that this liquid tartrazine is a good candidate as a routine dosimeter for irradiation applications that require a wide range of doses.

Keywords
liquid tartrazine; dosimetry; gamma radiation; colorimetric

Topic
Functional Materials

Link: https://ifory.id/abstract/K2qBH3tZ7yUv

Corresponding Author
Nadiya Miftachul Chusna

Institutions
(a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia
(b) Research Center of Minerals and Advanced Materials, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5 Malang 65145, Indonesia
*sunaryono.fmipa[at]um.ac.id

Abstract
Series of ferrogel samples have been successfully fabricated by using the freezing-thawing role. The filler used in ferrogel is magnetic material of Mn0.25Fe2.75O4/Ag which is synthesized by the co-precipitation method and chemical reduction. Whereas, the matrix used in ferrogel is a polymer composite of Carboxymethyl Cellulose (CMC) and Polyvinyl Alcohol (PVA). The characterization of Mn0.25Fe2.75O4/Ag powder was carried out by using X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM), and antibacterial activities. While the Mn0.25Fe2.75O4/Ag-CMC / PVA ferrogel was successfully characterized by antibacterial activity using the agar diffusion method. The XRD pattern of the powder of Mn0.25Fe2.75O4/Ag illustrates the peaks owned by Fe3O4 and silver phases. The morphology of the Mn0.25Fe2.75O4/Ag powder using TEM characterization shows the particles size of the Fe3O4 and Ag is 5.03 and 4.34 nm respectively. Meanwhile, the magnetization hysteresis curve of Mn0.25Fe2.75O4/Ag showed a decrease from 20.74 emu / g to 15.53 emu / g along with the addition of Ag material. Through the agar diffusion method, samples of Mn0.25Fe2.75O4/Ag powder and Mn0.25Fe2.75O4/Ag -CMC/PVA ferrogel showed excellent antibacterial activity as indicated by the widening of zones that were not overgrown with bacteria around the sample. Thus, the Mn0.25Fe2.75O4/Ag powder and Mn0.25Fe2.75O4/Ag-CMC/PVA ferrogel is potential for use in the biomedical field.

Keywords
ferrogels; magnetic properties; antibacterial; chemical reduction

Topic
Functional Materials

Link: https://ifory.id/abstract/MZugEKtyxh9D

Corresponding Author
Zahir Masrul

Institutions
a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
b) Center of Advanced Materials for Renewable Energy (CAMRY), Universitas Negeri
Malang, Jl. Semarang 5 Malang 65145, Indonesia
c) Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia
d) School of Physics, Suranaree University of Technology, Nakhon Ratchasima, Thailand
*markus.diantoro.fmipa[at]um.ac.id

Abstract
Research on exploring new materials and structures and optimizing of integrated photosupercapacitors systems are extensively developed. In this work, we report the study of the influence of light intensity on the performance of photosupercapacitors. The photosupercapacitors was constructed from active materials TiO2-ZnO-natural dye-DSSC-and BaTiO3-PVDF based supercapacitors. In the DSSC section, we used TiO2-ZnO for their excellent photon absorbing and electron mobility efficiency. In supercapacitor section, was constructed using BaTiO3 high dielectric material and ionic porous flexible PVDF material. A flexible aluminum foil was implemented as a common contact electrode separated DSSC and Supercapacitor section. XRD, FTIR,and SEM were used to characterize the raw or composite materials. While the photoelectric current (Isc), and open current voltage (Voc) at various intensity was performed using photodetector. The photo charging on supercapacitor section was measured using LCR meter while impinging light intensity of 30400, 60800, 91200, 144500,and 170800 Lux. It is shown that intensity significantly influences the charging rate on supercapacitor section. The higher the intensity, the quicker the charging occurs.

Keywords
DSSC-Supercapacitor, Charging, Photosupercapacitor, Photoelectric current, Capacitance.

Topic
Functional Materials

Link: https://ifory.id/abstract/T2JnYkVE3NdU

Corresponding Author
Yunita Anggraini

Institutions
(a) Magnetic and Photonic Research Group, Dept. of Physics
Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology
Jalan Ganesha 10, Bandung 40132, Indonesia
*nita.anggr[at]students.itb.ac.id

Abstract
The role of anion and alkyl chain length of cation on the thermophysical properties of imidazolium-based ionic liquid have been studied. The data were obtained from references and the NIST database. The studied parameters consist of melting temperature (Tm), glass transition temperature (Tg), decomposition temperature (Td), and enthalpy of fusion (∆Hm). The variations of Tm with anions in [C16Mim][A] with A= Br, Cl, BF4, PF6, and TFO are generally decreased with increasing anion radius, except for A= PF6, due to strong hydrogen bonds for the sake of an F atom. The values of critical temperatures (Tm, Tg, and Td) generally show a strong variation with the number of carbon atom or alkyl chain length (the number of n in [CnMim][A] for A = BF4, NTf2, and PF6). The variation of Tm in the number of n shows the non-monotonous variations. This characteristic is the result of the combination of interaction potentials in the crystalline and liquid phases. The variation of Tg in the number of n shows even-odd alternation, presumably due to competition between electrostatic and van der Waals forces. Many kinds of ILs have a relatively high value of Td, which means that it can be kept in the liquid state above 400 °C, which makes them have excellent catalytic activity and dynamic properties. The variation of Td with n looks different with Tm. It is seemingly that the variation of ∆Hm with n follows the Tm. This behavior in accordance with the thermodynamic relation between ∆Hm, Tm, and entropy (S) of the system.

Keywords
Ionic liquid, Imidazolium, melting temperature (Tm), glass temperature (Tg), decomposition temperature (Td), heat of fusion (∆Hm)

Topic
Functional Materials

Link: https://ifory.id/abstract/gBQWYNwDLnhy

Corresponding Author
Deris Afdal Yusra

Institutions
a)Department of Physics, University of Riau, 28293 Simpang Baru, Riau, Indonesia
*erman.taer[at]yahoo.com
b)Department of Chemical Engineering, University of Riau, 28293 Simpang Baru, Riau, Indonesia
c)Department of Industrial Engineering, State Islamic University of Sultan Syarif Kasim, 28293 Simpang Baru, Riau, Indonesia

Abstract
The activated carbon without addition of adhesive materials from banana stem fibers have been successfully synthesized by using ZnCl2 activator as a supercapacitor electrodes. The physical properties analysis such as density, surface morphology, degree of crystallinity, elemental content, surface area of the activated carbon electrode was carried out by using measurements of mass and volume, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and Brunaeur-Emmet-Teller (BET). The carbon electrode have a density of 0.627 g cm-3, surface morphology consists of carbon particles and carbon fiber, amorphous structures seen in scattering (2Ɵ) angle range of 23.588˚ and 44.411˚ for d002 and d100 diffraction planes, carbon content reaches as high as100% and the specific surface area was found 788,091 m2 g-1. The electrochemical properties were analyzed by using cyclic voltammetry method with 2 electrodes system in 1 M H2SO4 electrolyte solution. The specific capacitance, energy density, and power density of the supercapacitor cells were 178.545 F g-1, 6.19 Wh kg-1, and 44.6661 W kg-1 respectively. This study exhibit that banana stem fibers potentially to be developed as carbon electrodes in supercapacitor cell.

Keywords
carbon fiber; ZnCl2 activator; supercapacitor

Topic
Functional Materials

Link: https://ifory.id/abstract/4k3ap2fTyHB7

Corresponding Author
Setyawan Purnomo Sakti

Institutions
Departmet of Physics, Brawijaya University
Jl Veteran, Malang 65145, Indonesia
sakti[at]ub.ac.id

Abstract
Quartz Crystal Microbalance (QCM) sensor coating layer as selective and sensitive material was usually made in a thin layer to avoid any damping effect on the sensor. Coating thickness in the range of nanometer was typical. The used of a thick polymer coating was known in the range of less than 3(mu)m. Usually the coating layer was prepared to support the QCM sensor to work as a mass sensitive device based on the Sauerbrey equation. A targetted biomolecule or chemical molecule was seen as a pure deposited mass on top of the sensor in the vertical direction. In our work, an ultra-thick polystyrene coating was done. The polystyrene film was formed using a spin coating method. A high concentration of polystyrene solved in toluene was used for the coating. The impedance spectrum of the QCM sensor before and after coating was measured. The fundamental resonance frequency of the sensor changed bigger than 2% and less than 5% of its initial frequency. We observed that the coating contributed little effect to the electrical impedance of the QCM sensor. The calculated film thickness was up to 8.8(mu)m, which was ten times thicker than common film coating used on a QCM sensor. The impedance of the sensor shows that the coating was still considered as glassy film.

Keywords
QCM sensor; ultra-thick film; polystyrene

Topic
Functional Materials

Link: https://ifory.id/abstract/yf9z8qEMmvnj