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Dewi Sondari
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Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics

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PENGARUH METODE PEMISAHAN PELARUT DALAM GEL TERHADAP SIFAT FISIK TITANIA-ALUMINA SEBAGAI PENYANGGA KATALIS Silvester Tursiloadi; Dewi Sondari; Nino Renaldi; Hiroshi Hirashima
Jurnal Sains Materi Indonesia Vol 4, No 2: FEBRUARI 2003
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2003.4.2.4882

Abstract

PENGARUH METODE PEMISAHAN PELARUT DALAM GEL TERHADAP SIFAT FISIK TITANIA-ALUMINA SEBAGAI PENYANGGA KATALIS. TiO2-Al2O3 gel monolitik dalam nisbah mol 0,2 untuk TiO2 dan 0,8 untuk Al2O3 telah dibuat dengan cara hidrolisis dari aluminium sec-butoksida, Al (OC4H9sec)3 dan titanium isopropoksida Ti(OC3H7iso)4 dalam larutan n-propanol dengan katalis asam. Pemisahan pelarut dalam gel dilakukan dengan dua cara, pertama pengeringan pada tekanan atmosfer hingga terbentuk xerogel. Kedua, pemisahan pelarut pada kondisi CO2 superkritik, hingga terbentuk aerogel. Terbentuknya gugus Ti-O, salah satu dari titanium dioksida atau jaringan polimer –Ti-O-Ti-O-Al-O- ditunjukkan dengan adanya puncak antara 500 dan 900 cm-1 yang tajam tetapi lebar pada spektrum infra merah. Puncak yang kuat pada 1635 cm-1 menandakan adanya gugus –OH uluran yang merupakan derajat yang tinggi dari permukaan hidroksilasi. Volume kumulatif pori-pori dari xerogel sangat kecil jika dibandingkan dengan aerogel hasil pemisahan pelarut pada kondisi CO2 superkritik. Fase anatase TiO2 tidak terbentuk selama proses kristalisasi hingga kalsinasi sampai suhu 1000oC. Pengkristalan alumina terjadi secara langsung dari fasa amorf Al2O3 ke fasa α-Al2O3 dan fasa-fasa antara θ- dan γ-Al2O3 tidak teramati. Dari hasil tersebut dapat diperkirakan bahwa selama kalsinasi partikel TiO2 terpisah dari partikel Al2O3 membentuk inti atom rutil sebelum terbentuknya kristal α-Al2O3. Karena itu pembentukan fasa rutile TiO2 akan mempercepat terbentuknya fasa α-Al2O3. Keasaman campuran titania alumina setelah dikalsinasi pada suhu 500 oC lebih tinggi daripada oksidanya masing-masing, yaitu TiO2 dan Al2O3. Hal ini disebabkan oleh terbentuknya asam Lewis dari campuran titania-alumina.
SYNTHESIS OF POLYURETHANE MICROCAPSULE USING INTERFACIAL POLYMERIZATION AS SELF HEALING COATING MATERIAL Athanasia Amanda Septevani; Evi Triwulandari; Dewi Sondari
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1939.576 KB) | DOI: 10.14203/widyariset.15.2.2012.265–272

Abstract

Polyurethane microcapsule had been made as self healing coating material. Polyurethane microcapsule synthesis had been conducted by interfacial polymerization both spontaneous polymerization and prepolymer polyurethane polymerization using glycerol as renewable palm oil polyol. Based on FTIR-Spectra showed the functional group of polyurethane formed both spontaneous and prepolymer polyurethane polymerization. Polyurethane microcapsule formed was in spherical form. The particle size prepared by spontaneous polimerization was smaller than particle prepared by prepolymer polymerization at range 20,51±12,7 and 139,2±72,3 μm respectively.
SYNTHESIS OF POLYURETHANE MICROCAPSULE USING INTERFACIAL POLYMERIZATION AS SELF HEALING COATING MATERIAL Athanasia Amanda Septevani; Evi Triwulandari; Dewi Sondari
Widyariset Vol 15, No 2 (2012): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.15.2.2012.265–272

Abstract

Polyurethane microcapsule had been made as self healing coating material. Polyurethane microcapsule synthesis had been conducted by interfacial polymerization both spontaneous polymerization and prepolymer polyurethane polymerization using glycerol as renewable palm oil polyol. Based on FTIR-Spectra showed the functional group of polyurethane formed both spontaneous and prepolymer polyurethane polymerization. Polyurethane microcapsule formed was in spherical form. The particle size prepared by spontaneous polimerization was smaller than particle prepared by prepolymer polymerization at range 20,51±12,7 and 139,2±72,3 μm respectively.
Kinerja Katalis Nikel/Titanium Oksida Yang Dibuat Dengan Metoda Impregnasi Terhadap Hidrogenesi Minyak Sawit Dewi Sondari; S.R Wahuningsih
Jurnal Kimia Terapan Indonesia Vol 9, No 1-2 (1999)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2257.137 KB) | DOI: 10.14203/jkti.v9i1-2.188

Abstract

The preparation of nikel aktif metal catalyst and oksida titanium as supporting materials by impregnation method.The content of metal is various between 20-30% (weight). Specifik surface area of catalyst is measured BET method, the  content 22.5% of catalyst have maximal specific surface area is 14,5288m2/gr.From XRD analysis, aktif metal catalyst before reduction is metal oksida NiO (200) at 20 = 43,47, after reduction showednickle metal cristal at 20 = 44,50 is peak caracteristic from Ni (111).Test activity comerical catalyst after reaction time two hoursiodine number decreased 34,00 preparated catalyst 44,50 atcontent 22,5%.
The Effect of Acid Hydrolysis Treatment on the Production of Nanocellulose Based on Oil Palm Empty Fruit Bunches Athanasia Amanda Septevani; Dian Burhani; Yulianti Sampora; Yenni Apriliany Devy; Gita Novi Ariani; Sudirman Sudirman; Dewi Sondari; Khairatun Najwa Mohd Amin
Jurnal Kimia Terapan Indonesia Vol 21, No 1 (2019)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (41.173 KB) | DOI: 10.14203/jkti.v21i1.416

Abstract

Nanocellulose has been known as promising reinforcing material in various polymer based product resulted to remarkable improvement in mechanical and thermal properties. Hence, studies to date have developed and explored various sources of biomass to produce nanocellulose. The aims of this study are to synthesize and fully characterize nanocellulose obtained from abundantly available oil palm empty fruit bunches via two different methods which are strong (H2SO4) and mild acid (H3PO4) hydrolysis at 50 °C for 3.5 hours. Based on the morphological study using Transmission Electron Microscopy, rod like nanocellulose was obtained using strong acid hydrolysis while mild acid hydrolysis produced long filament shape. X-Ray diffraction analysis showed that the degree crystallinity of nanocellulose produced from strong acid hydrolysis was higher which is 96% than that of mild acid hydrolysis recorded with 86%. While the sulphuric acid hydrolysis usually produces lower thermal stability than that of other types acid hydrolysis, surprisingly, in this study, the thermal stability of nanocellulose from strong acid hydrolysis was relatively similar to mild acid hydrolysis due to the formation of single crystal structure affording unique characteristic of the obtained nanocellulose.
ANALISIS FAKTOR YANG MEMPENGARUHI INOVASI PRODUK NANOENKAPSULASI EKSTRAK PEGAGAN SEBAGAI SEDIAAN UNTUK MENGATASI SELULIT Dewi Sondari; M. Syamsul Maarif; Yandra Arkeman
JURNAL TEKNIK INDUSTRI Vol. 3 No. 1 (2013): Volume 3 No 1 Maret 2013
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Indusri Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.468 KB) | DOI: 10.25105/jti.v3i1.1586

Abstract

Innovation is a research, development, and/or engineering which aims to develop thepractical application of values and context of new knowledge, or new ways to apply science andtechnology that has existed in the product or production process. Anti-cellulite innovationdevelopment based on market opportunities, goals and objectives nanoencaptulation producean anti-cellulite product using nano technology. Factors thought to influence innovation incompanies such as leadership styles, personal characteristics and dynamics of the environmentand the user market factors. In an innovation planning of nanoencaptulation should attention tothe functional aspects of a component, part of the whole system works. The main purpose offunctional analysis and design stage is to define the interaction of each component with eachother.
Co-Authors Ahmad Randy Ariyadi Basuki Athanasia Amanda Septevani Athanasia Amanda Septevani Dian Burhani Evi Triwulandari Gita Novi Ariani Hiroshi Hirashima Khairatun Najwa Mohd Amin Kuntari Adi Suhardjo M. Syamsul Maarif Nino Renaldi S.R Wahuningsih Silvester Tursiloadi Sudirman Sudirman Surasno1 . Yandra Arkeman Yenni Apriliany Devy Yulianti Sampora