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All Journal Sains Natural: Journal of Biology and Chemistry Jurnal Pengelolaan Laboratorium Pendidikan Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Journal of Sylva Indonesiana International Journal of Recent Technology and Applied Science (IJORTAS) Indonesian Journal of Laboratory Jurnal Sylva Lestari Jurnal Ilmu Kehutanan Jurna Beta Kimia
Prihatini, Esti
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Energy Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics

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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%.
Tata Kelola Bahan Kimia di Laboratorium dengan Sistem Dokumen dan Perangkat Lunak Chemical Inventory Management System (CIMS) Berbasis Excel Ismail, Rohmat; Prihatini, Esti
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.v0i3.82022

Abstract

Laboratorium pendidikan seperti halnya laboratorium di industri dan pemerintahan yang harus menjaga keamanannya. Bahan-bahan kimia menjadi sumber utama bahaya laboratorium sehingga diperlukan sistem yang baik untuk inventarisasi bahan kimia seperti Chemical Inventory Management System (CIMS) berbasis excel dan sistem dokumen terintegrasi dalam bentuk form pengajuan, kartu bahan kimia, dan form mutasi. CIMS digunakan untuk mengatur bahan kimia mulai dari penerimaan, penyimpanan, penggunaan, dan pengelolaan limbah. Langkah-langkah penerapan CIMS dimulai dari kegiatan inventarisasi, pengaturan tempat, transfer data inventaris, dan sistem penggunaan bahan kimia. Penerapan CIMS dapat mewujudkan sistem keamanan dan keselamatan dari bahaya bahan kimia yang baik dan lebih efektif.
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
Sains Natural: Journal of Biology and Chemistry 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
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
Optimization of Extraction and Measurement Methods in the Determination of Total Iron (Fe) Content in Anti-Anemia Multivitamin Capsule Samples Ismail, Rohmat; Erlangga, Manasye; Wahyuningtyas, Irma; Prihatini, Esti
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21161

Abstract

Iron (Fe) is a transition metal that plays a critical role in human life, particularly as a micronutrient. The objective of this study is to optimize and ascertain the most appropriate method for measuring the total Fe content of anti-anemia multivitamin capsule samples, thereby ensuring the accuracy of the measurement results. The determination of total Fe content can be achieved through two metal extraction methods, namely wet digest and dry ashing methods, and two metal measurement methods, namely UV-Vis spectrophotometer and atomic absorption spectrophotometer (AAS). The findings revealed that the measurement of total Fe content by UV-Vis spectrophotometer through the dry ashing extraction method yielded a lower value (20.92 ± 0.29 mg/g) compared to the wet digest method (67.91 ± 0.83 mg/g). Furthermore, the Fe content determined by AAS analysis exhibited a reduced value in the dry ashing extraction method (1.42 ± 0.02 mg/g), while the wet digest extraction method yielded a substantially higher value (72.91 ± 4.12 mg/g). Statistical tests with the Duncan method revealed that the wet digest extraction method with UV-Vis spectrophotometer measurements is the most effective method for determining the total Fe content, with a significance level equivalent to the theoretical reference value (67.85 ± 0.03 mg/g).
Karakteristik Kayu Cepat Tumbuh Terimpregnasi Monoetilen Glikol dan Nanopartikel SiO 2 terhadap Serangan Jamur Pelapuk Kayu Rahayu, Istie; Saputri, Egydia; Priadi, Trisna; Wahyuningtyas, Irma; Prihatini, Esti; Ismail, Rohmat
Jurnal Ilmu Kehutanan Vol 18 No 2 (2024): September
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jik.v18i2.12288

Abstract

Jabon (Anthocephalus cadamba) and Sengon (Falcataria moluccana) were fast-growing wood species widely planted in the community forest. Both kinds of wood have low durability even though they can potentially be used in the carpentry material industry. Therefore, this research aimed to analyze the vacuum-pressure impregnation effect using monoethylene glycol (C2H6O2) or MEG and silica dioxide (SiO2) nanoparticles on wood resistance to fungal decay. The results showed that impregnation treatment with MEG and SiO2 nanoparticles significantly improved the durability of Jabon and Sengon against fungal attacks. Furthermore, MEGSiO2 with 24-hour polymerization had a better impact on durability compared to both the control and MEGSiO2 with 12-hour polymerization. The 24-hour polymerization using 1% SiO2 nanoparticles resulted in the lowest weight loss for Jabon (5.86% ) and Sengon (5.21%). In addition, the variation of SiO2 nanoparticle concentration did not significantly affect the weight loss and durability of Jabon and Sengon against fungal decay.
PENGUJIAN PERFORMA ALAT SPECTRONIC 20D+ DENGAN LARUTAN KALIUM PERMANGANAT (KMNO4) Ismail, Rohmat; Wahyuningtyas, Irma; Erlangga, Manasye; Prihatini, Esti
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.5992

Abstract

The Spectronic 20D+ is a simple spectophotometer that is still widely used in laboratories for both research and practicum activities. In order to ensure the continued accuracy of measurements, it is imperative that this instrument undergoes rigorous testing to ascertain its performance. The selection of potassium permanganate (KMnO4) as the testing solution is particularly salient in this context, given its notable advantages over conventional alternatives such as cobalt (II) chloride and potassium dichromate. These alternatives, while widely employed, are associated with a higher degree of risk and cost. The objective of this study is to ascertain the performance of the Spectronic 20D+ device when utilized with a KMnO4 solution. In this study, two units of Spectronic 20D+ were utilized, with one unit receiving a filter cleaning treatment only (PF), and the other undergoing a filter cleaning and replacement of the wolfram lamp (PFL). The maximum wavelength test yielded a value of 515 nanometers on both devices prior to the initiation of the repair process. The results of measuring the standard solution show that there is an increase in the amount of light absorbed, the slope of the line, and the coefficient of determination (R²). These were statistically tested with significantly different results on both tools after the repair process. This finding indicates that the measurement outcomes of the KMnO4 solution can serve as a reliable metric for evaluating the performance of the device before and after the repair process. Furthermore, following the restoration of the tool, the optimal linear range for KMnO4 concentration measurement was ascertained, ranging from 0 to 25 ppm. This determination was informed by the highest R2 value and the outcomes of cuvette correction testing, which yielded a consistent molar permissivity significance value as determined by the Duncan test for the five cuvettes utilized in this study.
Co-Authors Dwi Laksono, Gilang Erlangga, Manasye I Wayan Darmawan Irsan ALIPRAJA Ismail, Rohmat Istie Rahayu Khairunissa, Dhiya Khoerudin, Riki Laksono, Gilang Dwi Riadhi, Mohamad Rizki Sabarna, Aqila Alya Nabila Saputri, Egy Dia Saputri, Egydia Trisna PRIADI Wahyuningtyas, Irma