Widya Fatriasari
Indonesian Institute of Sciences
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Widya Fatriasari.
IOP Conference Series: Earth and Environmental Science | 2018
Apri Heri Iswanto; Supriyanto; Widya Fatriasari; Arida Susilowati
Refers to chemical content of sweet sorghum stalk especially for Numbu varian, sorghum bagasse issuitable for materials of particleboard. The objective of the experiment was to evaluate of particle treatment on physichal, mechanical, and durability properties of particleboard made from sorghum bagasse. For particle treatment, Sorghum bagasse immersed in cold water and hot water for 24 and 1 hours respectively. Particleboards were produced in size 25 by 25 cm2 with thickness and density target of 0.8 cm and 0.7 g/cm3. Amount of 10% Urea formaldehyde (UF) and 7% isocyanat (MDI) adhesive level used for manufacturing of board. Particle and adhesive were blended with rotary blending. Afterward, it was placed into mat former with size of 25 by 25 cm2. Mat was pressed by hot press machine. The pressing was conducted on 130°C temperature for UF resin and 160°C for MDI resin, pressure of 25 kg/cm2 and pressing time for 10 minutes. The results showed that particle soaking in hot water produced of lower thickness swelling compared to untreated board. Similar trend also occuron particleboard whichwas bonded with MDI resin. MDI as exterior adhesive resulted good performance in dimensional stability of sorghum bagasse particleboard. For UF bonded particleboard, immersing in hot water resulted in the low MOR, MOE and IB parameter. Its contrary with MDI bonded particleboard.
IOP Conference Series: Earth and Environmental Science | 2018
Widya Fatriasari; D T Nugroho Adi; Raden Permana Budi Laksana; Triyani Fajriutami; R Raniya; M Ghozali; Euis Hermiati
Previously, the chemical characteristics of isolated lignin from Acacia mangium black liquor of kraft pulping was characterized. This lignin was blended with natural rubber latex (NR-L) as adhesive in laminated wood. In addition, lignin has potency for biosurfactant materials by modification of the hydrophobic into hydrophilic properties. Therefore, this study was intended to develop lignin as material for amphipilic lignin derivatives (A-LD) biosurfactant by reacting lignin with epoxilated polyethylene glicol (PEG). A-LD addition in slurries was used to improve the enzymatic hydrolysis (EH) of kraft pulp sweet bagasse sorghum (SSB). The main observation in EH performance was to investigate the effect of lignin isolation method (one and two step) in A-LD and A-LD loading addition on reducing sugar yield (RSY) of SSB kraft pulp. The pulp was hydrolyzed at 50°C and 150 rpm for 72 h with 10 FPU cellulase loading in the shaking incubator. A-LD from one (L1S) and two step (L2S) lignin was added with A-LD loading of 0, 1, 2, 5, and 10% (b/v). The RSY of hydrolyzate has been observed after EH. A-LDs addition in EH of SSB kraft pulp enhanced RSY. L1S worked better in reaction performance with PEDGE compared to L2S and LS. A better performance was showed by PEDGE 500 than that of PEDGE 6000. Generally, the higher A-LDs loading resulted higher RSY. The highest RSY (81.33%) was resulted in addition of 10% A-LD L1S using PEDGE 500. A 5% A-LD loading was more considered to be added in EH because the RSY was comparable with 10% A-LD loading.
INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY (ISAC) 2016 | 2017
Nissa Nurfajrin Solihat; Triyani Fajriutami; Deddy Triyono Nugroho Adi; Widya Fatriasari; Euis Hermiati
Kraft pulping of sweet sorghum bagasse (SSB) has been used for effective delignification method for cellulose production. This study was conducted to evaluate the performance pulp kraft of SSB for reducing sugar production. The study intended to investigate the effect of active alkali and sulfidity loading variation of SSB pulp kraft on reducing sugar yield per biomass. The SSB pulp was prepared after pulping using three variations of active alkali (17, 19, and 22%) and sulfidity loading (20, 22, and 24%) at 170°C for 4 h with liquor to wood ratio of 10. A total of 9 pulps were obtained from these pretreatments. Delignification pretreatment has been succesfully removed lignin and hemicellulose more than 90% and 50%, respectively. Increasing active alkali and sulfidity loading has significantly increased lignin removal caused by disruption of the cell wall structure for releasing lignin into black liquor in the cellulose extraction. The enzymatic hydrolysis of pulp was carried out with cellulase loading of...
Journal of the Korean wood science and technology | 2016
Apri Heri Iswanto; Arida Susilowati; Irawati Azhar; Riswan Riswan; Supriyanto Supriyanto; Joel Elpinta Tarigan; Widya Fatriasari
The objective of this research was to evaluate physical and mechanical properties of three species of Styrax woods from North Tapanuli in Indonesia. The woods were more than 15 years old. Physical properties such as specific gravity, green moisture content, and volume shrinkage were determined by the procedures based on BS-373 standard for small clear specimen. Furthermore, mechanical properties, including modulus of rupture, modulus of elasticity, compression parallel to grain and hardness were also tested according to the standard. Along the stem direction, the edge section had better properties compared with those near the pith section. And the base section had also better properties than upper section. Based on the specific gravity, all of the Styrax woods in this research were classified into III-IV strength classes. A good dimensional stability was demonstrated by the value of the tangential and radial ratio which reached one. With the consideration of the mechanical properties, Styrax woods were suitable use for raw materials of light construction, furniture and handy craft.
Teknologi Indonesia | 2015
Sita Heris Anita; Widya Fatriasari; Deni Zulfiana
Biopulping black liquor, byproduct from biopulping process using white-rot fungi (Phanerochaete chrysosporium) that has been incubated for 30 and 45 days, was used as preservative of Jabon wood (Anthocephalus cadamba Miq.). The main objectives of this study was to investigate the effect of various dipping durations of preservative on absorption process into wood and the weight loss of un-preserved and preserved wood againts fungal attack. Preservation method used in this study was dipping method with various dipping durations (i.e. 10, 30, and 60 minutes) with triplicate. The result showed that dipping process of of Jabon wood into biopulping black liquor for 60 minutes demonstrated the highest retention, i.e.0.21 g/cm3. The weight losses suffered fom by un-preserved and preserved Jabon wood were 55.19% to 55.67% and 6.64% to 12.78%, respectively. Biopulping black liquor had improved the resistance of Jabon wood to both white-rot and brown rot fungi attacks compared to untreated wood sample.
Waste and Biomass Valorization | 2017
Widya Fatriasari; Sita Heris Anita; Lucky Risanto
Journal of Engineering and Technological Sciences | 2015
Widya Fatriasari; Supriyanto Supriyanto; Apri Heri Iswanto
Theory of Computing Systems \/ Mathematical Systems Theory | 2014
Widya Fatriasari; Wasrin Syafii; Nyoman Wistara; Khaswar Syamsu; Bambang Prasetya
International Journal of Renewable Energy Development | 2014
Widya Fatriasari; Wasrin Syafii; Nyoman Wistara; Khaswar Syamsu; Bambang Prasetya
Waste and Biomass Valorization | 2016
Nyoman Wistara; Rospita Pelawi; Widya Fatriasari