Indonesia Conference Directory

Corresponding Author
Henni Sitompul

Institutions
a) Department of Physics Education, Pelita Harapan University, Tangerang, Indonesia

b) Faculty of Math and Science, Bogor Agricultural University, Bogor, Indonesia

c) Faculty of Veterinary Medicine, Bogor Agricultural University, Bogor, Indonesia

d) National Nuclear Energy Egency of Indonesia, Tangerang Selatan, Indonesia

Abstract
The development of Mg-based biomaterials in orthopedics has been extensively studied in the past 17 years. Various methods and compositions were developed to obtain Mg-based biomaterials that have mechanical properties and corrosion resistance which match the bone. One of the developments was done by composing Mg alloy with other material. In this research,will be synthesized biokomposit Mg6Zn-xHAp with sintering process at 3500C. The biocomposites were synthesized by mixing the HAp powder on the Mg6Zn powder mixture with the composition of 5%, 7% and 9% using ball milling for 30 minutes. Biocomposites were characterized by Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), X-ray diffraction (XRD) and Potensiostat. The SEM / EDS results showed that the Mg6Zn-xHAp biocomposite had microstructures whose grain size decreased as the HAp composition got larger with HAp at the grain boundaries only. The XRD pattern of Mg6Zn-xHAp biocomposite indicated that some of Zn atoms had dissolved in Mg to form a solid solution in the sintering process. The greater composition of HAp in the material results in a decrease of Zn in Mg. The greater composition of HAp in the material results in a smaller Zn solubility in Mg. In addition, XRD results also showed that the crystallite biocomposite size is smaller when the composition of HAp in it is greater. Thus, it can be said that HAp can act as a refiner of the Mg alloy. The presence of HAp in the material also affects the corrosion rate where the greater the composition of HAp in the material the smaller the corrosion rate of the resulting material.

Keywords
Mg6ZnHAp, Biocomposite, Hap, Mg6Zn

Topic
Biomaterials and applications

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

Corresponding Author
Phanawan Whangdee

Institutions
(a) Department of Applied Physics, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, 30000, Thailand
(b) Advanced Materials and Renewable Energy Research Unit, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, 30000, Thailand
(c) School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
(d) Research Unit of Advanced Ceramics, Department of Materials Science, Faculty of Science, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand
(e) Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand

Abstract
The anodized films were fabricated by electrochemical anodization of Ti-6Al-4V in an H3PO4/ C2H5OH/NH4F electrolyte. The surface morphology was determined by field-emission scanning electron microscopy (FE-SEM). The surface roughness was characterized by atomic force microscopy (AFM), the chemical species were measured by X-ray photoelectron spectroscopy (XPS) and the hydrophilicity was measured by the contact angle measurement. The results show that the surface morphology, surface roughness chemical species and hydrophilicity of the anodized films change during anodizing process. The two-step anodization using 0.2 mA/cm2 in 1M H3PO4 + 80 % V/V C2H5OH + 1 wt % NH4F could enhance hydrophilicity to the anodized films. The findings indicate that the hydrophilicity was enhanced due to the increased roughness and OH group on the surface of the anodized films.

Keywords
Hydrophilicity, Fluoride, Low current density, Two-step anodization

Topic
Biomaterials and applications

Link: https://ifory.id/abstract/FhUyBAHErp7G

Corresponding Author
Arie Listyarini

Institutions
(a) Department of Physics, Universitas Indonesia
*cuk.imawan[at]sci.ui.ac.id

Abstract
Studies on mechanical and barrier properties of Cassava starch/PVA composites reinforced with pineapple leaf nanocellulose have been done to obtain an alternative new biodegradable food packaging. The aim of this research is to investigate changes of mechanical and barrier properties of cassava starch/PVA/Nanocellulose compared with cassava starch/PVA composite. Composition of Starch/PVA was 50:50 with nanocellulose concentration vary from 1, 3, 6 and 10% in bionanocomposites. Tensile strength, elongation, and water vapor transmission rate were used to evaluate the mechanical and barrier of bionanocomposite films. The microstructure was evaluated using FT-IR, SEM, and XRD. Results showed that increasing the concentration of nanocellulose decreasing the tensile strength and elongation of bionanocomposites. Nanocellulose decreased the transparency of the composite films. Addition of 1% nanocellulose increased the WVTR and then the WVTR of bionanocomposite films containing 3 – 10% nanocellulose decreased up to 10 – 20%.

Keywords
nanocellulose, bionanocomposites, mechanical properties, water barrier properties

Topic
Biomaterials and applications

Link: https://ifory.id/abstract/wKHeVkj2htYD

Corresponding Author
Muhammad Khairurrijal

Institutions
Deparment of Physics, Universitas Gadjah Mada, Indonesia
*m.khairurrijal[at]mail.ugm.ac.id

Abstract
Hydroxyapatite (HAp) made from crab shells on SS 316L was successfully coated using electrophoretic deposition (EPD) method. Variations used in the EPD process are electrical voltage (20 volts and 50 volts), deposition time (10 and 5 minutes), and speed of withdrawal (0.1 mm/s; 0.5 mm/s; 1 mm/s). These three combinations of variations are not yet used in this coating method before. The layer characteristics using SEM and XRD showed differences in shape of the morphology of the layers and the crystal structure for each variation of the experiment. At higher electrical voltages the morphology of the layer gets better with less agglomeration and the thickness of the layer increased. At high voltages, the shorter deposition time increased the quality of the crystal structure but reduced the thickness of the layer. Retraction speed affects the bond strength between layers and substrate. The higher the withdrawal speed, the stronger the kinetic energy that interferes with the binding layer. The best results in this study were obtained at 50 volts, with a withdrawal speed of 0.1 mm/s in 5 minutes. This result can be seen by the fairly evenly distributed HAp layer covering the substrate, sufficient layer density and high crystalline size and purity of the HAp layer.

Keywords
crab shells, EPD, HAp, bone implants, SS 316L

Topic
Biomaterials and applications

Link: https://ifory.id/abstract/VFgr3NCmeWa8

Corresponding Author
Yuni Warty

Institutions
Institut Teknologi Bandung

Abstract
The appropriate treatment method for patient with urinary stones can be determined from the information of the mineral composition of urinary stones. The prediction of the stone type could improve the selection of the interventional modalities. The aim of the study was to determine the type of the urinary stone for each layer based on the value of Housefield Units (HU) from micro CT-SkyScan images. Five samples were cleaned with 75% alcohol and distilled water. Micro skyScan 1173 was used to scan urinary stones with applied current and voltage of 66 mA and 120 kV respectively. NRecon software was used to reconstruct the projected image. Region of Interest (ROI) was set at each layer and analyzed both qualitatively and quantitatively. The determination of chemical constituents of stones/fragments was performed using Energy Dispersive X-Ray Spectroscopy. The chemical compositions of calcium oxalate, a mix of calcium oxalate and calcium phosphate, struvite, uric acid, and a mix of uric acid and calcium phosphate were accurately identified based on the micro SkyScan images with the mean HU for each composition were 1356 ± 188, 1038, 391 ± 151, 391 ±249, and 1384 ± 195, respectively. Micro SkyScan images could predict the chemical composition for each layer of urinary stones. However, more samples are needed for clustering various types of urinary stones based on HU value.

Keywords
micro CT-SkyScan, Housefield Units, Energy Dispersive X-Ray Spectroscopy

Topic
Biomaterials and applications

Link: https://ifory.id/abstract/vraqfRDX2uz3