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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Ilmu dan Teknologi Hasil Hutan Sains Natural: Journal of Biology and Chemistry Jurnal Pengelolaan Laboratorium Pendidikan Jurnal Ilmu dan Teknologi Kayu Tropis Journal of Sylva Indonesiana ULIN: Jurnal Hutan Tropis International Journal of Recent Technology and Applied Science (IJORTAS) Journal of Engineering, Technology, and Applied Science (JETAS) Wood Research Journal : Journal of Indonesian Wood Research Society Wood Research Journal : Journal of Indonesian Wood Research Society Indonesian Journal of Laboratory Jurnal Pusat Inovasi Masyarakat Jurnal Sylva Lestari Jurnal Ilmu Kehutanan Jurnal Ilmu Kehutanan
Istie Rahayu
Department Of Forest Products, Faculty Of Forestry, Bogor Agricultural University (IPB), Bogor (16680)
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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The Physical and Magnetic Properties of Sengon (Falcataria moluccana Miq.) Impregnated with Synthesized Magnetite Nanoparticles Saviska Luqyana Fadia; Istie Sekartining Rahayu; Deded Sarip Nawawi; Rohmat Ismail; Esti Prihatini
Jurnal Sylva Lestari Vol. 11 No. 3 (2023): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i3.761

Abstract

Sengon is one of the fast-growing wood that dominates Indonesian plantation forests and has been used as industrial raw material, fuel, and construction material. To enhance the physical characteristics of sengon wood, it needs technology of wood quality improvement, such as impregnation method by using Fe3O4 nanoparticles. Beside to enhance the quality of sengon wood, this technology can also expand the utilization of fast-growing wood. The presented research aims to examine the effects on physical and magnetic properties of sengon wood after being treated by magnetite nanoparticles impregnation. Magnetite nanoparticles were prepared by coprecipitation method with a precursor solution of iron ions mixture and weak base (NH4OH). The treatments of the magnetic wood consisted of 3 different concentrations that is untreated, 1% and 5% magnetite nanoparticles impregnation solution with demineralized water as a dispersant. Dimensional stability parameters, such as weight percentage growth, bulking impact, and effectiveness against swelling are increasing along the increase of concentration. Characterization tests such as SEM–EDX analysis showed the existence of Fe deposition in the wood cell membranes and pores of the wood. XRD analysis showed the appearance of magnetic peaks in the diffractogram in accordance with the decreased of crystallinity while the concentration increased and FTIR analysis showed Fe-O functional groups. Sengon wood magnetic was identified based on the VSM study, as a superparamagnetic components with mild magnetic characteristics.
The Effect of Synthetic and Commercial Nano-Magnetite on the Electromagnetic Absorbance Behavior of Magnetic Wood Istie Sekartining Rahayu; Aqila Alya Nabila Sabarna; Irma Wahyuningtyas; Rohmat Ismail; Esti Prihatini; Wayan Darmawan; Gilang Dwi Laksono; Irsan Alipraja
Jurnal Sylva Lestari Vol. 12 No. 2 (2024): May
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v12i2.889

Abstract

Magnetic wood with good electromagnetic wave absorption properties was prepared by comparing synthetic and commercial nano-magnetite (Fe3O4-NP) as sengon (Falcataria moluccana) wood impregnation solution. The co-precipitation method produced a synthetic nano-magnetite with NH4OH as a weak base precursor. Meanwhile, the commercial one was purchased from a supplier. Three levels of nano-magnetite concentration (1%, 2.5%, and 5%) were dispersed in deionized water. The impregnation process was done by applying a vacuum of 0.5 bar for 120 minutes, followed by a pressure of 1 bar for 120 minutes. The results showed that the commercial nano-magnetite caused more improvements in weight percent gain, density, and hardness than the synthetic nano-magnetic, although they were insignificantly different. There was also a reduction in brightness with the overall color change being categorized into other colors because the color became darker with increasing nano-magnetite concentration in both woods. The absorbance capacity of the synthetic nano-magnetite-treated wood was larger than the commercial nano-magnetite-treated wood. This synthetic nano-magnetite-treated wood had been optimally treated at a 5% concentration, making it suitable for use as electromagnetic wave shielding material because it can absorb almost 100% electromagnetic waves. Keywords: Fe3O4, impregnation, nano-magnetite, sengon wood, shielding materials
Impregnation Effect of Synthesized Fe3O4 Nanoparticles on the Jabon Wood’s Physical Properties Rahayu, Istie Sekartining; Ismail, Rohmat; Darmawan, Wayan; Wahyuningtyas, Irma; Prihatini, Esti; Laksono, Gilang Dwi; Khairunissa, Dhiya
International Journal of Recent Technology and Applied Science (IJORTAS) Vol 6 No 2: September 2024
Publisher : Lamintang Education and Training Centre, in collaboration with the International Association of Educators, Scientists, Technologists, and Engineers (IA-ESTE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36079/lamintang.ijortas-0602.701

Abstract

This study focused on characterizing synthetic magnetite (Fe3O4-NP) and evaluating the impregnated jabon wood’s physical properties. The co-precipitation method used for the synthesis of Fe3O4-NP, namely by mixing the iron solution (n/n Fe2+:Fe3+=1:2) with the strong base of sodium hydroxide (NaOH) (MG-S) and weak base of ammonium hydroxide (NH4OH) (MG-W) as precursors. The impregnation stage uses parameters of a -0.5 bar vacuum for half an hour and 2 bar pressure for 2 hours with magnetite concentrations of 1; 2.5; 5% w/v in a demineralized water solvent. Scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and Fourier transform infrared spectrometry (FTIR) confirmed the presence of Ferrum content and Fe-O functional group in both Fe3O4-NPs produced. The Fe3O4-NP size was also measured via the X-ray diffraction analysis, namely 34.54 nm for the MG-S and 39.24 nm for the MG-W. Magnetic strength obtained was 7.51 mT for the MG-S and 8.58 mT for the MG-W. The impregnated jabon wood’s physical properties also improved with indications of an increase in wood density, weight percent gain (WPG), bulking effect (BE), anti-swelling efficiency (ASE), and a decrease in water absorption (WA). The results showed the best treatments were MG-S 2.5% and MG-W 5%.
Pengaruh Larutan Furfuril Alkohol Dan Nanopartikel SiO2 pada Beberapa Metode Impregnasi Kayu Jabon Prihatini, Esti; Wahyuningtyas, Irma; Rahayu, Istie Sekartining; Ismail, Rohmat
Indonesian Journal of Laboratory Vol 6 No Edisi Khusus 2023
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijl.v0i3.84108

Abstract

Salah satu cara untuk mengantisipasi kekurangan persediaan kayu berkualitas di Indonesia yaitu melalui modifikasi kayu cepat tumbuh dengan metode impregnasi kayu. Penelitian ini bertujuan untuk membandingkan metode impregnasi menggunakan vacuum drying oven dan tabung impregnasi dengan proses impregnasi vakum, tekan, dan vakum tekan. Kayu yang digunakan dalam penelitian ini yaitu kayu Jabon (Anthocephalus cadamba Miq.). Larutan impregnasi terdiri dari tanpa perlakuan, Furfuril Alkohol (FA), dan FA yang dicampur dengan nanopartikel silika (SiO2) menggunakan sonikator. Hasil penelitian menunjukkan metode impregnasi FA dan nanopartikel SiO2 memberikan pengaruh nyata terhadap nilai WPG sampel tanpa perlakuan, FA, dan FA-SiO2 0,5%, sedangkan pada pengujian kerapatan penggunaan metode hanya berpengaruh nyata pada sampel terimpregnasi FA dan tidak berpengaruh nyata pada sampel tanpa perlakuan dan terimpregnasi FA-SiO2 0,5%. Hasil penelitian terbaik diperoleh pada sampel kayu Jabon terimpregnasi FA dengan metode impregnasi vakum tekan, dengan nilai weight percent gain (WPG) dan kerapatan yang diperoleh adalah 25,90% dan 0,53 kg/cm3.
Compatibility Testing of Synthesized TiO2 Nanoparticles on The Fast-Growing Wood Physical Properties Prihatini, Esti; Ismail, Rohmat; Sekartining Rahayu, Istie; Dwi Laksono, Gilang; Khairunissa, Dhiya
JURNAL SAINS NATURAL Vol. 14 No. 2 (2024): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jsn.v14i2.611

Abstract

Jabon wood (Anthochepalus cadamba) has inferior quality, so it is necessary to modify the wood to improve the quality of its physical properties, namely by impregnating TiO2 nanoparticles (NP-TiO2). This study aims to determine the right synthesis method for the synthesis of NP-TiO2 so as to improve the quality of the physical properties of jabon wood optimally. The results of FTIR testing showed that jabon wood has successfully impregnated NP-TiO2 by hydrothermal and solvothermal methods with ethanol, acetone, and methanol solvents with the identification of the functional group of Ti-O at wavenumber 533 cm-1 and the Ti-O-Ti functional group at wavenumber 679 cm-1 which is the bond formed in the framework of the TiO2 compound. The results of the physical properties test showed that NP-TiO2 which was successfully impregnated into wood was synthesized using hydrothermal and solvothermal methods, namely acetone, methanol, and ethanol, with a WPG value of 1.36%, 2.6%, 2.16%, and 1.61%, respectively. XRD test results show that jabon wood has successfully impregnated NP-TiO2 by hydrothermal and solvothermal methods using acetone, ethanol, and methanol solvents with the identification of anatase TiO2 crystal lattice and crystal sizes of 16.21, 15.94, 14.27, dan 15.75 nm, respectively.
Pengembangan Sistem Alat Ukur Sudut Kontak dengan Metode Optical Contact Angle Prihatini, Esti; Ismail, Rohmat; Rahayu, Istie Sekartining; Saputri, Egy Dia
Jurnal Pengelolaan Laboratorium Pendidikan Vol.6, No.1, Januari 2024
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.6.1.8-16

Abstract

Penelitian ini bertujuan untuk mengembangkan sistem alat pengukur sudut kontak yang merupakan salah satu metode penentuan karakteristik permukaan material kayu. Data analisis yang dihasilkan oleh sistem alat yang sudah purwa rupa ini, berupa citra digital berbentuk video lalu dipotong pada kelipatan 10 detik dengan perangkat lunak GOM Player. Sudut kontak dari setiap potongan gambar tersebut kemudian diukur dengan menggunakan aplikasi Image J dan diambil data nilai sudut kontak pada detik ke 100, 200 dan 300 dengan 7 kali ulangan, lalu ditentukan nilai %RSD untuk menentukan tingkat kepresisiannya. Hasil pengolahan data sudut kontak secara statistik menunjukan tingkat presisi yang baik. Hal tersebut dapat dilihat dari hasil pengukuran sudut kontak cairan finishing pada kayu mahoni yaitu  (46,379 ±1,728)O dengan nilai RSD sebesar 3,73%  pada waktu pengambilan gambar 100 detik, ( 45,335±1,930)O dengan nilai RSD sebesar 4,26% pada waktu pengambilan gambar 200 detik dan (44,198±1,170)O dengan nilai RSD sebesar 2,65 % pada waktu pengambilan gambar 300 detik. Pengukuran sudut kontak yang presisi menjadi hal penting untuk akurasi penentuan karakteristik material yaitu tingkat keterbasahan, hidrofobisitas, dan tegangan permukaan serta aplikasinya yang luas di bidang pendidikan, penelitian dan industri.
Mechanical Properties and Durability of Impregnated Sengon Wood Using Monoethylene Glycol and SiO2 Nanoparticles Rahayu, Istie; Riadhi, Mohamad Rizki; Wahyuningtyas, Irma; Prihatini, Esti; Ismail, Rohmat
Journal of Sylva Indonesiana Vol. 7 No. 02 (2024): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v7i02.15729

Abstract

Sengon wood (Falcataria moluccana Miq.) is a short-rotation wood which has weak quality characteristics, i.e., low specific gravity, strength, durability, density, and dimensional stability. This study aimed to find out the impact of monoethylene glycol (MEG) and SiO2 nanoparticle impregnation treatment on mechanical properties (MOE, MOR, and hardness) and wood durability. Four kinds of solution were used to impregnate sengon wood: untreated (water), 50% MEG, MEGSiO2 0.5%, and MEGSiO2 1%. The impregnation process was initiated by applying 0.5 atm of vacuum for 60 minutes, followed by 2.5 bar of pressure for 120 minutes. The results showed that MEG and SiO2 nanoparticle impregnation treatment significantly affected the mechanical properties (MOE, MOR, and hardness) and the durability of sengon wood against dry wood and subterranean termite bites. The optimum treatment to increase the properties of sengon wood so that its strength class increases to III-IV and durability class IV was MEG SiO2 1% treatment
The effect of microwave treatment on the color changes and wettability of sembilang bamboo (Dendrocalamus giganteus Munro) Davinsy, Rynaldo; Rahayu, Istie Sekartining
ULIN: Jurnal Hutan Tropis Vol 8, No 1 (2024)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32522/ujht.v8i1.12344

Abstract

Bamboo has the potential to be a substitute for wood, although it is no exception that bamboo has many weaknesses. Bamboo is a plant with fast growth, short recycling times, and the potential to be used as structural and non-structural materials. Sembilang bamboo is a bamboo that has a large diameter and is commonly known as giant bamboo. Poor adhesive dispersion was a problem in previous studies, and the presence of discoloration due to important treatments was known. Heating using a microwave is a step in this research to solve the problems that occur. The research was carried out by measuring bamboo samples of a certain size, then the bamboo was scanned, and the wettability was measured initially and at the end of the test. Bamboo samples were heated in the microwave at a certain temperature of 60–75°C for 0.5–1 minute. The results of the 1 minute and 0.5 minute microwave treatment tests can increase wettability so that the spread becomes longer, with a small K value of 0.391. This is presumably because the contact angle is less than 90°. In addition, the treatment also had a small and moderate effect on the color differences that occurred.
Quality Evaluation of Fast-Growing Wood Impregnated with Nano-Silica Synthesized from Betung Bamboo Stems Rahayu, Istie; Khoerudin, Riki; Wahyuningtyas, Irma; Prihatini, Esti; Ismail, Rohmat
Jurnal Sylva Lestari Vol. 12 No. 3 (2024): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v12i3.926

Abstract

Sengon (Paraserianthes falcataria L. Nielsen.) and jabon (Anthocephalus cadamba Miq.) are fast-growing wood of low quality. This study aims to overcome the disadvantages of low-quality wood via impregnation using monoethylene glycol (MEG), and nano-silica synthesized from betung bamboo stems (Dendrocalamus asper). Nano-silica was obtained by the ultrasonication method, with the average size and zeta potential at 93 nm and -44.21 mV, respectively. This study used five different solutions: untreated, 50% MEG, MEG-Silica 0.5%, MEG-Silica 0.75%, and MEG-Silica 1%. The impregnation process began when a vacuum of 0.5 bar was applied for 60 minutes and continued with a pressure of 2.5 bar for 120 minutes. The results showed that sengon and jabon experienced an increase in quality as seen from the parameters of weight percent gain, specific gravity, modulus of elasticity, modulus of rupture, hardness, color brightness, and durability against dry wood and subterranean termites. Besides, the strength and durability classes of both kinds of wood also improved to III and IV, respectively, with the solution’s concentration gradually increasing. Based on the results, MEG-Silica 1% is the most influential solution in improving the physical-mechanical properties and durability of sengon and jabon wood. Keywords: Anthocephalus cadamba, Dendrocalamus asper, impregnation, nano-silica, Paraserianthes falcataria
Mikrostruktur dan Karakteristik Permukaan Kayu Pinus Scots (Pinus sylvestris L.) Termodifikasi Gliserol dan Asam Sitrat Tobing, Gabriel; Sofiaturizkiyah, Nurul; Basri, Efrida; Martha, Resa; Rahayu, Istie; Gérardin, Philippe; Darmawan, Wayan
Jurnal Ilmu Pertanian Indonesia Vol. 29 No. 4 (2024): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.29.4.554

Abstract

Scots pine (Pinus sylvestris L.) wood is one of the most popular timber export products. However, its low durability can reduce the potential and utilization of the wood. Chemical modification is one of the solutions to overcome this drawback. Chemical modification using non-biocide materials such as glycerol and citric acid was carried out to improve the inferior properties of wood. The study aimed to observe the microstructure and evaluate the surface characteristics of glycerol and citric acid-modified scots pine wood. Scots pine wood was modified using glycerol and citric acid with weight percent gain (WPG) values of 20% and 46%. Surface characteristics were measured, including surface roughness, surface free energy (SFE), wettability, and bonding quality. The results show that chemical modification using glycerol and citric acid resulted in the structure of the pine wood being more filled and denser. The modification could also reduce the roughness of the wood surface, resulting in decreased SFE value, increased contact angle, and decreased wettability on the wood surface. It might cause a decrease in the bonding quality because the wood did not have the strength to mechanically lock with the paint. Glycerol and citric acid modified-scots pine wood can be considered for exterior application. Keywords: citric acid, glycerol, microstructure, scots pine, surface characteristics
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Salam Min Rohmatillah Akhrudin Maddu Alifah Fidela Alifah Syahfitri Aqila Alya Nabila Sabarna Arinana Arinana Deded Sarip Nawawi Dodi Nandika Dwi Laksono, Gilang Efrida Basri Esti Prihatin Esti Prihatini Esti Prihatini Esti Prihatini Esti Prihatini Gérardin, Philippe Gilang Dwi Laksono Gilang Dwi Laksono I Ketut Nuridja Pandit I Nyoman Jaya Wistara I Wayan Darmawan Ina RITA Irma Wahyuningtyas Irma Wahyuningtyas Irsan Alipraja Ismail, Rohmat Khairunissa, Dhiya Khoerudin, Riki Laksono, Gilang Dwi Lina Karlinasari Martha, Resa Mersi Kurniati Muflihati Muflihati Muslimatul Rahmi Naresworo Nugroho Pipin Supinah Prihatini, Esti Remy Marchal Riadhi, Mohamad Rizki Rita Kartika Sari Rizky Ramdhani Rohmat Ismail Rohmat Ismail Rynaldo Davinsy, Rynaldo Saputri, Egy Dia Saputri, Egydia Satriyo H Wicaksono Saviska Luqyana Fadia Sofiaturizkiyah, Nurul Tobing, Gabriel Trisna PRIADI Vera Junita Sitanggang Wahyuningtyas, Irma Wasrin Syafii Wayan Darmawan Widyana LUZA Yoki Putra YOLANDA Zahrial COTO