Yohanes Nugroho - Academia.edu (original) (raw)

Papers by Yohanes Nugroho

Research paper thumbnail of Development and Characterization of Three-Dimensional Lattice Hydroxyapatite Scaffolds Using Aqueous Based Extrusion Fabrication (ABEF) for Biomedical Applications

Research paper thumbnail of Fabrication and characterization of porous bone scaffold of bovine hydroxyapatite-glycerin by 3D printing technology

Bioprinting, 2020

This research aims to know the mechanical properties of bone graft bio-composites of bovine hydro... more This research aims to know the mechanical properties of bone graft bio-composites of bovine hydroxyapatite (BHA)-Glycerin by deposition using three-dimensional (3D) Printer. BHA-Glycerin was mixed with a various ratio of 60:40, 45:55, 35:65, 30:70 and 25:75 (%wt) which precipitated for 24 h. After homogenization process, bio-ink shaped slurry was acquired that will be used as material to be printed in 3D printer into scaffold. After the printing process was completed then the scaffold was dried on heated bed for 10 min and reheated in the microwave for 15 min at a temperature of 100 C. As a result, the highest hardness of 3D bone scaffold BHA-Glycerin was 24.23 AE 1.22VHN while the lowest was 2.03 AE 0.12VHN. The produced hardness is lower than the commercial HA product and human bone. The highest compressive strength was 5.71 AE 0.43 MPa and the lowest was 3.22 AE 0.13 MPa. The produced compressive strength is in the range of the commercial HA and human bone. The highest density of scaffold BHA-Glycerin is 1.65 AE 0.06 g/cm 3 while the lowest is 1.28 AE 0.07 gr/cm 3. The produced density is lower than the commercial HA product and higher than human bone. Observations pores with a microscope show pore size of 300-400 μm and have a square shape.

Research paper thumbnail of Effect of heat bed temperature of 3D bioprinter to hardness and compressive strength of scaffold bovine hydroxyapatite

AIP Conference Proceedings, 2018

This study aimed to investigate the effect of heat bed temperature of 3D bioprinter toward compre... more This study aimed to investigate the effect of heat bed temperature of 3D bioprinter toward compressive strength and hardness bovine bone hydroxyapatite scaffold for bone filler applications. BHA-glycerin mixed with a ratio of 1:1, and keep it for 24 hours. After the homogenization process acquired, bio-Ink with shaped slurry will be used as a material for a 3D printer. The printing process with a temperature variation have performed by setting up heat bed temperature. After printing process was completed, the 3D scaffold was detained on the heat bed for 10 minutes before being picked up. The test results in this study had the lowest hardness value of 9.82±0.62 VHN and the highest number of 24.32±0.99 VHN. The compressive strength testing had the lowest value of 1.62±0.16 MPa with the highest number of 5.67±0.39 MPa. Pore observation using a scanning electron microscope. The result shows that the size of the pores were not much different, that was ±100-200 µm. This observation also indicated that the pore form was square pores.

Research paper thumbnail of The effect of extruder pressure of 3D bioprinter on hardness and compressive of scaffold bovine hydroxyapatite

Cogent Engineering, 2019

as soon as possible after acceptance. Copyediting, typesetting, and review of the resulting proof... more as soon as possible after acceptance. Copyediting, typesetting, and review of the resulting proof will be undertaken on this manuscript before final publication of the Version of Record (VoR). Please note that during production and pre-press, errors may be discovered which could affect the content.

Research paper thumbnail of Pengaruh Sudut Kemiringan Tool Friction Stir Welding terhadap Sifat Mekanik dan Struktur Mikro pada Sambungan Plat AA5083

JMPM (Jurnal Material dan Proses Manufaktur), 2018

Penelitian ini bertujuan untuk mempelajari pengaruh sudut kemiringan tool pada proses friction st... more Penelitian ini bertujuan untuk mempelajari pengaruh sudut kemiringan tool pada proses friction stir welding (FSW) terhadap sifat mekanik dan struktur mikro sambungan las pelat aluminium sheet 5083. Pengelasan menggunakan mesin milling dan material welding tool dari jenis Bohler K100 dengan kekerasan 59HRc. Proses pengelasan ini memiliki kecepatan putar spindle 1125 rpm, kecepatan pengelasan 30 mm/menit, dan kedalaman pembenaman tool 3,9 mm. Variasi sudut kemiringan tool terdiri dari 1°, 2°, 3° dan 4°. Pengujian spesimen dengan uji tarik, uji tekuk, uji kekerasan dan pengamatan secara makro dan mikro. Hasil penelitian menunjukan kekuatan tarik tertinggi (312,5MPa) pada sudut kemiringan 3°. Kekuatan tekuk uji face bending tertinggi (655,1MPa) dan root bending tertinggi (651,8MPa) pada sudut kemiringan 2°. Daerah retreating side rata-rata mempunyai kekerasan yang lebih tinggi dibanding advancing side. Sudut kemiringan tool sampai 3° meningkatkan kekuatan tarik dan di atas sudut tersebut membuat kekuatan tarik menurun, sedangkan nilai kekuatan tekuk optimal terjadi pada sudut 2°. Pada foto mikro, semakin besar sudut kemiringan tool membuat ukuran butir pada daerah HAZ semakin besar tetapi tidak terlalu berpengaruh terhadap nugget.

Research paper thumbnail of Development and Characterization of Three-Dimensional Lattice Hydroxyapatite Scaffolds Using Aqueous Based Extrusion Fabrication (ABEF) for Biomedical Applications

Research paper thumbnail of Fabrication and characterization of porous bone scaffold of bovine hydroxyapatite-glycerin by 3D printing technology

Bioprinting, 2020

This research aims to know the mechanical properties of bone graft bio-composites of bovine hydro... more This research aims to know the mechanical properties of bone graft bio-composites of bovine hydroxyapatite (BHA)-Glycerin by deposition using three-dimensional (3D) Printer. BHA-Glycerin was mixed with a various ratio of 60:40, 45:55, 35:65, 30:70 and 25:75 (%wt) which precipitated for 24 h. After homogenization process, bio-ink shaped slurry was acquired that will be used as material to be printed in 3D printer into scaffold. After the printing process was completed then the scaffold was dried on heated bed for 10 min and reheated in the microwave for 15 min at a temperature of 100 C. As a result, the highest hardness of 3D bone scaffold BHA-Glycerin was 24.23 AE 1.22VHN while the lowest was 2.03 AE 0.12VHN. The produced hardness is lower than the commercial HA product and human bone. The highest compressive strength was 5.71 AE 0.43 MPa and the lowest was 3.22 AE 0.13 MPa. The produced compressive strength is in the range of the commercial HA and human bone. The highest density of scaffold BHA-Glycerin is 1.65 AE 0.06 g/cm 3 while the lowest is 1.28 AE 0.07 gr/cm 3. The produced density is lower than the commercial HA product and higher than human bone. Observations pores with a microscope show pore size of 300-400 μm and have a square shape.

Research paper thumbnail of Effect of heat bed temperature of 3D bioprinter to hardness and compressive strength of scaffold bovine hydroxyapatite

AIP Conference Proceedings, 2018

This study aimed to investigate the effect of heat bed temperature of 3D bioprinter toward compre... more This study aimed to investigate the effect of heat bed temperature of 3D bioprinter toward compressive strength and hardness bovine bone hydroxyapatite scaffold for bone filler applications. BHA-glycerin mixed with a ratio of 1:1, and keep it for 24 hours. After the homogenization process acquired, bio-Ink with shaped slurry will be used as a material for a 3D printer. The printing process with a temperature variation have performed by setting up heat bed temperature. After printing process was completed, the 3D scaffold was detained on the heat bed for 10 minutes before being picked up. The test results in this study had the lowest hardness value of 9.82±0.62 VHN and the highest number of 24.32±0.99 VHN. The compressive strength testing had the lowest value of 1.62±0.16 MPa with the highest number of 5.67±0.39 MPa. Pore observation using a scanning electron microscope. The result shows that the size of the pores were not much different, that was ±100-200 µm. This observation also indicated that the pore form was square pores.

Research paper thumbnail of The effect of extruder pressure of 3D bioprinter on hardness and compressive of scaffold bovine hydroxyapatite

Cogent Engineering, 2019

as soon as possible after acceptance. Copyediting, typesetting, and review of the resulting proof... more as soon as possible after acceptance. Copyediting, typesetting, and review of the resulting proof will be undertaken on this manuscript before final publication of the Version of Record (VoR). Please note that during production and pre-press, errors may be discovered which could affect the content.

Research paper thumbnail of Pengaruh Sudut Kemiringan Tool Friction Stir Welding terhadap Sifat Mekanik dan Struktur Mikro pada Sambungan Plat AA5083

JMPM (Jurnal Material dan Proses Manufaktur), 2018

Penelitian ini bertujuan untuk mempelajari pengaruh sudut kemiringan tool pada proses friction st... more Penelitian ini bertujuan untuk mempelajari pengaruh sudut kemiringan tool pada proses friction stir welding (FSW) terhadap sifat mekanik dan struktur mikro sambungan las pelat aluminium sheet 5083. Pengelasan menggunakan mesin milling dan material welding tool dari jenis Bohler K100 dengan kekerasan 59HRc. Proses pengelasan ini memiliki kecepatan putar spindle 1125 rpm, kecepatan pengelasan 30 mm/menit, dan kedalaman pembenaman tool 3,9 mm. Variasi sudut kemiringan tool terdiri dari 1°, 2°, 3° dan 4°. Pengujian spesimen dengan uji tarik, uji tekuk, uji kekerasan dan pengamatan secara makro dan mikro. Hasil penelitian menunjukan kekuatan tarik tertinggi (312,5MPa) pada sudut kemiringan 3°. Kekuatan tekuk uji face bending tertinggi (655,1MPa) dan root bending tertinggi (651,8MPa) pada sudut kemiringan 2°. Daerah retreating side rata-rata mempunyai kekerasan yang lebih tinggi dibanding advancing side. Sudut kemiringan tool sampai 3° meningkatkan kekuatan tarik dan di atas sudut tersebut membuat kekuatan tarik menurun, sedangkan nilai kekuatan tekuk optimal terjadi pada sudut 2°. Pada foto mikro, semakin besar sudut kemiringan tool membuat ukuran butir pada daerah HAZ semakin besar tetapi tidak terlalu berpengaruh terhadap nugget.