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All Journal Eksergi: Chemical Engineering Journal Jurnal Sains Materi Indonesia
Daniel Timotius
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Distribusi Ukuran Granul dari Tepung Singkong dengan Tepung Tapioka sebagai Pengikat pada Rotary Drum Granulator Dian Purnami Handayani; Wahyudi Budi Sediawan; Daniel Timotius; Mitha Puspitasari
Eksergi Vol 20, No 2 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i2.9170

Abstract

Granulation is a process of monoparticle attachment with a particular mechanism to form a bigger and compact particle which is called granule. Granulation application has been used on many industries like pharmacy and agriculture industries. Research about granulation has been done continuously to get predictive models for various cases. The model which is only applicable to the specific material used in this research is expected to be useful to optimize the perfomances of the granulator in the industries. This research aims to develop the kinetics model of granule size distribution of cassava flour and its connection to granulation time by varying the mass of tapioca starch as the binder in rotary drum granulator. 2 grams of Cassava flour and tapioca starch were mixed in the rotary drum granulator and then water was sprayed during the granulation process. The duration of granulation were 5, 10, 15, 20, and 25 minutes. The variations of mass of the binder used in this research were 1, 1,5, and 2 gram. The granules were dried in the oven at 80°C until 30 minutes, and afterwards the granules were screened through various screen layers with different mesh size. The results of this research show that binder mass variations do not influence the layering rate of granule, and the increase of binder mass will decrease the birth rate.
Dielectric and electronic structure modulation in andalusite through nitrogen and boron substitution: a first-principles study Muhammad Redo Ramadhan; Retno Dwi Nyamiati; Nina Anggita Wardani; Daniel Timotius; Dhimas Arief Dharmawan; Raden Achmad Chairdino Leuveano; Dwi Amalia
Jurnal Sains Materi Indonesia Vol. 28 No. 1 (2026): Jurnal Sains Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2026.16906

Abstract

The dielectric and electronic properties of Al2SiO5 were studied using density functional theory (DFT) with the GGA PBE and meta-GGA r2SCAN functionals. The orthorhombic andalusite structure was optimized with each functional. Compared with PBE, r2SCAN gave lattice parameters closer to the experimental values and a larger band gap, and was therefore used to examine the substituted structures. Boron and nitrogen were introduced by replacing Al and O, respectively, while P substitution at the Si site was included for comparison. The PDOS of pristine andalusite shows a valence band dominated by O-2p states, with contributions from Al and Si near the conduction-band edge. Both B1 and B2 remained insulating after substitution, with B-O hybridization appearing in the valence band region. In contrast, N and P substitution produced states near the Fermi level. The charge-density-difference maps also show that the distribution of charge depends on the substitution site. B1 shows a more localized redistribution around the B-O region, whereas B2, N, and P produce more anisotropic redistribution. For the insulating B-substituted systems, the dielectric response increased slightly relative to pristine andalusite, accompanied by changes in the refractive index and absorption spectra. These findings indicate that the electronic and dielectric properties of andalusite depend on both the substituting element and its local coordination environment.
Co-Authors Dharmawan, Dhimas Arief Dian Purnami Handayani DWI AMALIA Mitha Puspitasari Muhammad Redo Ramadhan Nina Anggita Wardani Nyamiati, Retno Dwi Raden Achmad Chairdino Leuveano Wahyudi Budi Sediawan