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All Journal Jurnal Sains Materi Indonesia Jurnal Ilmu dan Teknologi Kayu Tropis
Holia Onggo
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Agriculture, Biological Sciences & Forestry Materials Science & Nanotechnology

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MONITORING KESTABILAN DISPERSI MULTI WALL CARBON NANOTUBE DALAM SURFAKTAN HEXADECYLTRIMETHYL AMMONIUM BROMIDE Holia Onggo; Djulia Onggo; R. Yudianti
Jurnal Sains Materi Indonesia Vol 13, No 2: FEBRUARI 2012
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (873.717 KB) | DOI: 10.17146/jsmi.2012.13.2.4715

Abstract

MONITORING KESTABILAN DISPERSI MULTI WALL CARBON NANOTUBE DALAM SURFAKTAN HEXADECYLTRIMETHYL AMMONIUM BROMIDE. Kestabilan dispersi Multi Wall Carbon Cano Tube (MWCNT) dalam larutan yang mengandung Hexadecyl trimethyl Ammonium Bromide (CTAB) diamati dengan UV spektrofotometer. Dispersi MWCNT dalam larutan CTAB dengan rasio massa 1: 2 dibuat dengan bantuan ultrasonic vibracell pada amplitude 60% dengan variasi waktu sonikasi 60menit, 90menit dan 120 menit. Pengaruh waktu sonikasi dan waktu penyimpanan terhadap kestabilan dispersi diamati dengan mengukur absorbansi dispersi dengan UV spektrofotometer. Perubahan morfologi MWCNT akibat gelombang ultrasonik yang ditimbulkan oleh ultrasonic vibracell diamati dengan Scanning/ Transmission Electron Microscope (S/TEM). Meningkatnya waktu sonikasi menyebabkan laju dispersi MWCNT meningkat ditunjukan dengan berkurangnya diameter dan panjang MWCNT. Penambahan surfaktan CTAB yang berlebihan dalam larutan menyebabkan proses sonikasi menjadi tidak efektif. Kestabilan dispersi MWCNT dapat bertahan selama 20 hari.
Pengaruh Sodium Hidroksida dan Hidrogen Peroksida terhadap Rendemen dan Warna Pulp dari Serat Daun Nenas The Effect of Sodium Hydroxide and Hydrogen Peroxide on the Yield and Color of Pulp from Pineapple Leaf Fiber Holia Onggo; Jovita Tri Astuti
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 3, No 1 (2005): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (254.474 KB) | DOI: 10.51850/jitkt.v3i1.304

Abstract

Chemical pulping process of pineapple leaf fiber with sodium hydroxide (NaOH) and bleaching process of pulp with hydrogen peroxide (H2O2) were conducted to see the influence of treatment on the yield and the color of the pulp produced. Raw materials were cayenne type pineapple leaf of 6~7 months old from Subang, West Java. Color was measured with a Portable Color Difference Meter Model CDX-105 with CIE 1976 L*a*b* (CIELAB) method.The result showed that  NaOH and H2O2 can be used for bleached pulp making. The pulp yield of the treatment decreased but their lightness of the color increased. The optimum pulp properties were obtained by using 10% NaOH  at 100°C and solid to liquid ratio 1:20 at 1 hour cooking time. The yield was 73% and value of L* around 84.6. By using 2% H2O2, the yield decreased 7.6% but the value of L* increased to 92.2.  The color of the pulp was white.  Value of the different color (DE*ab) compare to the white standard is 8.7. Decreasing of its yield caused by dissolving of  lignin, non fiber and pigment.
Co-Authors Djulia Onggo Jovita Tri Astuti R. Yudianti