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All Journal Jurnal Biofisika Jurnal Ilmu Pertanian Indonesia Jurnal AGROTEKNOLOGI Jurnal Sains Materi Indonesia Jurnal Keteknikan Pertanian Jurnal Ilmu dan Teknologi Kayu Tropis Makara Journal of Science Newton-Maxwell Journal of Physics

Siti Nikmatin

Institut Pertanian Bogor

Author-ID : 3235232

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Electrical & Electronics Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

Published : 18 Documents Claim Missing Document

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Aplikasi Serat Kapuk dan Balsa dengan Perlakuan Alkali sebagai Bahan Penguat Komposit (Alkaline Treated-Kapok and Balsa Fibers for Composite Reinforcement) Renny Purnawati; Fauzi Febrianto; Nyoman J Wistara; Siti Nikmatin; Sudirman Sudirman; Marwanto Marwanto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 16, No 1 (2018): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Natural fibers of kapok and balsa can be potential renewable raw material for reinforced polymer composite. Alkaline treatment carried out in the present works was intended to develop the physical and chemical properties of the fibers before its application in reinforced composites preparation. The treatments involve of using NaOH at the concentration of 2, 4, 6, 8 and 10%. The change of morphological characteristics, crystallinity index, functional groups, and water contact angle were analyzed by using SEM, FTIR, XRD and contact angle analyzer, respectively. Upon alkaline treatments, the fibers were clean, flatten, and the surface tended to be rough. Defibrillation occurred at higher alkaline concentration. Alkaline treatment on the fibers shifted and changed the peak absorption intensity of -OH, C-O, C=C and C=O. Up to 8% NaOH concentration, alkaline treatment increased the crystallinity of the fibers, however decreased when the concentration of NaOH reaching 10%. Alkaline treatment on the fibers removed lignin, hemicellulose, and waxy substance of the fiber surface, increased surface roughness, and therefore is expected to create better interfacial adhesion.

Perubahan Kadar Komponen Kimia Bambu Andong akibat Perlakuan Steam (Change of Chemical Components Content in Andong Bamboo due to Steam Treatment) Muhammad I Maulana; Deded S Nawawi; Nyoman J Wistara; Rita K Sari; Siti Nikmatin; Sena Maulana; Se-Hwi Park; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 16, No 1 (2018): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Steam and rinsing treatment with water and 1% NaOH solution of andong bamboo strands have been known to improve physical and mechanical properties of its oriented strand board (OSB). The improvement of bamboo OSB properties might be caused by the change of chemical components content during steam and rinsing process. This study aims to measure the changes of chemical components content in andong bamboo (Gigantochloa pseudoarundinacea) due to steam treatment and rinsing with water or sodium hydroxide solution. Samples was taken from andong bamboo stem without bark and node part. The treatments of samples were steam at 126 ° C for 1 hour, steam and rinsing with water, and, steam and rinsing with 1% NaOH, respectively. Air-dried samples were, then, subjected to mill in order to get 40-60 mesh particles size, which was used for chemical components analyses. The results showed that steam and rinsing with water or 1% NaOH solution treatment reduced hemicellulose and extractive contents (dissolved in cold water, hot water, ethanol-benzene and NaOH 1% solution), whereas alpha-cellulose and lignin were relatively stable. Steam and rinsing treatment generally increased the pH value of bamboo samples.

Morphology of Microfibrillated Cellulose from Primary Sludge Iwan Risnasari; Fauzi Febrianto; Nyoman J Wistara; Sucahyo Sadiyo; Siti Nikmatin
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 2 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Sewage sludge is the largest waste produced from the pulp and paper mill, consist of fibers (50-60%) and inorganic materials.The aim of this study was to obtain the microfibrillated cellulose of sludge through extraction and cellulose disintegration. The cellulose disintegration conducted by a combinations of the refining and ultrasonication treatment. The results showed that after extraction process the mass of C and O were increased. Conversely the mass of Al, Ca, Si and S were decreased. The mass of C and O was further increased after refining and ultrasonication treatment. The process of extraction on sludge could remove lignin, hemicellulose and inorganic materials to obtain more pure cellulose. Cellulose disintegration by a combination of the refining 30 times followed by ultrasonication for 120 min produced microfibrillated cellulose with diameter of 284 nm.Key words: extraction, microfibrillated cellulose, morphology, sludge

Peningkatan Sifat Papan Partikel Sengon dengan Perlakuan Perendaman Air Dingin (Improvement the Properties of Particleboard Made from Sengon with Cold Water Immersion Treatment) Marwanto Marwanto; Sena Maulana; Muhammad I Maulana; Nyoman J Wistara; Siti Nikmatin; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 16, No 2 (2018): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objectives of this research is to evaluate the physical and mechanical properties of particle board made from sengon and mangium woods treated with cold water immersion. Particles of sengon and mangium immersed in cold water for 24 hours. The particles of sengon and mangium are combined with a ratio of 100: 0; 0: 100; 75:25; and 50:50. Particle boards are made in size (30x30x0,9) cm3 with target densities of 0.7 g cm-3. The particle board was binded with methylene diphenyl diisocyanate (MDI) adhesive at 10% content and hot press at 140 °C with 25 kgf cm-2 for 7 minutes. The physical and mechanical properties of particle board are evaluated according to JIS A 5908-2003 standard. The physical and mechanical properties of particle board were much affected by particle combination and cold water immersion treatment. The physical (i.e density, moisture content, water absorption (WA), and thickness swelling (TS)) and mechanical properties (ie. modulus of elasticity (MOE), modulus of rupture (MOR), and internal bonding (IB)) were evaluated. The results showed that cold water immersion improved dimensional stability (WA and TS) of particle board obtained. However, some mechanical properties decreased.

Properties of Wood Plastic Composite Using Primary Sludge as Filler Iwan Risnasari; Fauzi Febrianto; Nyoman J Wistara; Sucahyo Sadiyo; Siti Nikmatin
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 13, No 1 (2015): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Sludge is the largest waste produced from the pulp and paper mill, it consists of 50-60% fibers and inorganic materials and have caused serious disposal problem. Recycling sludge into value-added product can give environmental and economic benefits. The objective f this research was to optimize utilization of sludge as filler in wood plastic composite using polypropylene as a matrix resin. Sludge with and without purification treatment were used as filler. The concentration of filler used was 40%, 50% and 60%. Maleic anhydride-modified- polypropylene (MAPP) with concentration of 5% was used as a coupling agent. Filler, matrix with and without coupling agent were compounded using Haake polydrive labopastomill at 175 °C, 60 rpm for 20 min. The results indicated that the morphology, physical, mechanical and thermal properties of wood plastic composites was much influenced by purification treatment, filler loadings and addition of coupling agent. Interaction of between fibers and matrix resin and thermal stability of wood plastic composites were much improved by purification treatment on sludge and addition of coupling agent.Keywords: coupling agent, fillers, purification, sludge, wood plastic composite

Morphological, Chemical, and Thermal Characteristics of Nanofibrillated Cellulose Isolated Using Chemo-mechanical Methods Solikhin, Achmad; Hadi, Yusuf Sudo; Massijaya, Muh Yusram; Nikmatin, Siti
Makara Journal of Science
Publisher : UI Scholars Hub

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The objective of this research was to analyze the morphology, crystallinity, elemental components, and functional group changes, as well as thermal stability of nanofibrillated cellulose (NFC). Nanofibrillated cellulose has an irregular and aggregated shape with a diameter of about 100 nm. NFC self-aggregations were observed due to hydrogen bonding and Van-der Waals forces. The cellulose crystallinity index, atomic size, and polymorph of the NFC sample were found to be 63.57%, 2.2 nm, and cellulose I, respectively. The NFC sample was composed of various elemental components, such as C, O, N, Na, Al, Si, and K. IR analysis showed only small amounts of hemicellulose and lignin deposits, whereas cellulose functional groups appeared inseveral wavenumbers. Aromatic and oxygenated compounds, such as carboxylic acids, phenols, ketones, and aldehydes, were deposited as extractive on NFC; these compounds were associated with cellulose, hemicellulose, and lignin. The NFC thermal degradationprocess consisted of four steps: water evaporation (50-90 °C); hemicellulose degradation and glycosidic linkage cleavage (250-325 °C); amorphouscellulose and lignin degradation (325-429.29 ºC); and cellulose crystalline degradation (above 429.29 °C).

Effects of Different Extraction Solvents on the Extractive Removal and Properties of Oil Palm Empty-Fruit Bunch Cellulosic Nanofibers Solikhin, Achmad; Hadi, Yusuf Sudo; Massijaya, Muh Yusram; Nikmatin, Siti
Makara Journal of Science
Publisher : UI Scholars Hub

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In this study, the effect of different extraction solvents on the isolation and properties of cellulosic nanofibers (CNFs) were investigated. The unextracted and different solvent-extracted CNFs formed horn-like features and irregularly aggregated nanofibers after oven drying. Scanning electron microscopy at 10000× magnification revealed the smooth external surfaces of all extracted CNFs; this finding is attributed to the limited deposition of amorphous lignocellulosic components on the fibers. All resultant CNF solutions revealed aggregation, with a particle size distribution and zeta average of 21.39–513.00 nm and 162.26–342.13 nm, respectively. Extraction with different solvents and chemical treatment yielded CNF solutions with good transparency. Increases in crystallinity indices were generated by extractive removal and enhanced the delignification and bleaching processes. The atomic crystal size of untreated and different solvent-treated CNFs varied with the type of native cellulose. A dramatic decrease in organic (i.e., C, N, and O) and inorganic (i.e., Na, K, and Si) elements was observed following extractive removal and cellulose purification

Analisa Sifat Mekanik pada Bahan Anti Peluru dari Adisi Berpenguat Serat Panjang Tandan Kosong Kelapa Sawit (TKKS) okta riza; Siti Nikmatin; Hendradi Hardhienata; Firda Aulya Syamani
Newton-Maxwell Journal of Physics Vol. 3 No. 1: April 2022
Publisher : UNIB Press

Kelapa sawit merupakan salah satu hasil perkebunan di Indonesia yang perkembangannya meningkat setiap tahun. TKKS merupakan limbah dari pabrik sawit yang pemanfaatannya belum optimal sehingga akan menjadi limbah padat. Penggunaan serat TKKS pada biokomposit adalah upaya reduksi dan pemanfaatan limbah TKKS yang melimpah. Tujuan dari penelitian ini adalah untuk mendapatkan biokomposit dengan adisi serat panjang TKKS ter-modifikasi untuk aplikasi bahan anti peluru dan mengetahui sifat mekanisnya. Sifat mekanik pada biokomposit yang diperoleh pada penelitian ini memiliki sifat mekanik yang baik untuk aplikasi bahan anti peluru, dimana biokomposit tersebut lentur dan mampu meredam gaya dan energi yang diberikan oleh peluru. Sampel terbaik berada pada biokomposit yang mengandung konsentrasi serat sebesar 18% dengan polimer epoxy

Co-Authors Abi K Arif Achmad Solikhin Aginsa T. Putri Agus Sukarto Akhiruddin Maddu Akhirudin Maddu Akhirudin Maddu Aminah Balfas Arifianto Arifianto Aris Purwanto Deded Sarip Nawawi Denni Prasetia Fauzi Febrianto Firda Aulya Syamani Gustan Pari Hendradi Hardhienata I Nyoman Jaya Wistara Irmansyah - Iwan Risnasari LISDAR I. SUDIRMAN Marwanto Marwanto Marwanto Marwanto Marwanto Marwanto, Marwanto Maulana, Mohammad I Maulana, Sena Mersi Kurniati Muh Yusram Massijaya Muh Yusram Massijaya, Muh Yusram Muhammad Iqbal Maulana Nam-Hun Kim Nicken O Putri okta riza Purnawati, Renny Ratih Langenati Rinto Paputungan Rita K Sari Se-Hwi Park Setyo Purwanto Setyo Purwanto Solikhin, Achmad Sucahyo Sadiyo Sudirman Sudirman Tieneke Mandang Yusuf Sudo Hadi

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