101 research outputs found
Pengaruh Massa Nanopartikel Magnetik Fe3O4/Ag yang Disintesis Menggunakan Metode Hijau Terhadap Specific Absorption Rate dalam Aplikasi Hipertermia
Get PDFPenelitian ini mengkaji pengaruh massa nanopartikel magnetik (NPM) Fe3O4/Ag yang disintesis dengan menggunakan metode green synthesis (GS) atau sintesis hijau terhadap Specific Absorption Rate (SAR) dalam aplikasi hipertermia. Hasil menunjukkan bahwa GS-NPM Fe3O4/Ag menampilkan ukuran kristal berkisar antara 42,69 nm hingga 43,58 nm. NPM Fe3O4/Ag menghasilkan energy gap sebesar 2,50 eV dengan panjang gelombang 414 nm. NPM Fe3O4/Ag memiliki bilangan gelombang untuk gugus fungsi O-H, C-H, N-Ag, Fe-O, dan Fe-O-Si. Kuantitas NPM Fe3O4/Ag sangat mempengaruhi nilai SAR. Nilai SAR terendah dan tertinggi untuk Fe3O4/Ag dalam penelitian ini adalah 0,43 W/g pada massa 0,125 gram dan 1,11 W/g pada massa 0,025 gram. Secara keseluruhan, penelitian ini sukses dalam menciptakan NPM Fe3O4/Ag secara ramah lingkungan dengan memanfaatkan ekstrak MO yang memiliki variasi kuantitas Fe3O4/Ag
Pengaruh Massa Nanopartikel Magnetik MnFe2O4/TiO2 yang Disintesis dengan Metode Hijau Terhadap Degradasi Metilen Biru Untuk Uji Fotokatalis
No full textThe growth of the textile industry has worsened the problem of properly disposing of liquid waste, including industrial dyes, in an environmentally friendly manner. This study aims to simulate the degradation of industrial dyes, especially methylene blue, through photocatalytic tests using MnFe2O4/TiO2 nanocomposite. MnFe2O4/TiO2 nanocomposite were manufactured using a green method, green synthesis, with varying masses of 0.02 grams, 0.04 grams, 0.06 grams, 0.08 grams, and 0.10 grams. Furthermore, the coprecipitation method is employed with the objective of creating magnetic particles that are on the scale of nanometers. The X-ray diffraction (XRD) spectra of MNPs indicates a crystalline size of 13.3 nm. The infrared Fourier transform analysis reveals the presence of Mn-O, Fe-O, and Ti-O functional groups at wave numbers of 439.1 cm-1, 587.1 cm-1, and 586.8 cm-1, respectively. The presence of these functional groups indicates the successful synthesis of MnFe2O4/TiO2 nanocomposite. The band gap of MnFe2O4/TiO2 nanocomposite is within the range of 3 electron volts (eV). MB, an organic compound dye, may be destroyed using photocatalytic processes by exposing it to UV light. The degradation of the substance achieved a complete reduction of 100% within a duration of 20 minutes during the photocatalytic process, using an ideal mass of 0.02 grams. The MnFe2O4/TiO2 nanocomposite possess the potential to be frequently utilized due to their capability in separating from the degradation solution. Hence, our results indicate that the MnFe2O4/TiO2 nanocomposite with a mass of 0.02 grams has the highest efficiency in degrading methylene blue, even when the mass is varied
A synthesis of polyethylene glycol (PEG)-coated magnetite Fe3O4 nanoparticles and their characteristics for enhancement of biosensor
No full textThe magnetite Fe _3 O _4 nanoparticles were synthesized by using chemical co-precipitation method and these nanoparticles were successfully coated by polyethylene glycol (PEG) with variation concentrations of PEG. The magnetite Fe _3 O _4 nanoparticles used as a bimolecular label (nano-tags), exhibiting a soft magnetic behavior with magnetization ( M _s ) of 77.16 emu g ^−1 and coercivity ( H _c ) of 50 Oe respectively. The polyethylene glycol (PEG) was used as a biocompatible polymer. The x-ray diffraction (XRD) patterns of the Fe _3 O _4 showed that Fe _3 O _4 was well crystallized. It also confirmed the existence of invers spinel. The diffraction peak of 35.4° was used to calculate the crystallite size. The estimation of Fe _3 O _4 average crystallite size is 12 nm, while the PEG-coated Fe _3 O _4 nanoparticles is 8.6 nm. The transmission electron microscopy (TEM) images of Fe _3 O _4 showed that the morphology of magnetite Fe _3 O _4 nanoparticle is spherical in shape with uniform grain size and good dispersibility despite the agglomeration it found in some place. The addition of PEG can decrease the agglomeration and reduce the particle size. The existence of PEG layer on Fe _3 O _4 was confirmed by Fourier transform infrared (FTIR) spectroscopy. The result of Vibrating Sample Magnetometer (VSM) showed that saturation magnetization ( M _s ) of Fe _3 O _4 nanoparticles decreased from 77.16 to 37.15 emu g ^−1 with the increase of PEG weight from 0% to 50%. Such Fe _3 O _4 nanoparticles with favorable size and tunable magnetic properties are promising biosensor applications
HAMBATAN KOMUNIKASI DALAM PROSES GANTI KERUGIAN TANAH PELEBARAN JALAN TRANS SULAWESI POROS MAKASSAR-PAREPARE DI KABUPATEN PANGKEP
Get PDFAbstract This study aims to determine the form of communication that is done in the process of land restitution, factors that become an obstacle in the process of restitution of land and also determine whether communication in the ground damages the widening of the Trans Sulawesi Makassar-Pare Pare shaft in the District implemented Pangkep.Penelitian by using research methods kualitatif.Subyek this study consisted of 24 community informants comprised of landowners, community leaders, political leaders, lawyers, and related SKPD on government Pangkep. The research data was obtained through in-depth interviews, observation and documentation were then analyzed using descriptive analysis kualitatif. research results obtained show that the obstacles that arise in the process of restitution of land for the construction of the Trans Sulawesi in Pangkep is disagreement on the amount of damages because the difference in price fixing base compensation between the government and society caused by several factors including bureaucratic communication, frame of mind, psychological, interests, and prejudices.Abstrak Penelitian ini bertujuan untuk mengetahui bentuk komunikasi yang dilakukan dalam proses ganti kerugian tanah,faktor-faktor yang menjadi penghambat dalam proses ganti kerugian tanah dan apakah komunikasi turut menentukan dalam ganti kerugian tanah pelebaran jalan Trans Sulawesi Poros Makassar-Parepare di Kabupaten Pangkep.Penelitian ini dilaksanakan dengan menggunakan metode penelitian kualitatif.Subyek penelitian ini terdiri dari 24 orang informan yang terdiri dari masyarakat pemilik tanah, tokoh masyarakat, tokoh politik, pengacara, dan SKPD terkait lingkup Pemda Pangkep . Data penelitian ini diperoleh melalui wawancara mendalam, observasi dan dokumentasi selanjutnya dianalisis dengan menggunakan analisis deskriftif kualitatif. Berdasarkan hasil penelitian yang didapat menunjukkan bahwa hambatan-hambatan yang timbul dalam proses ganti kerugian tanah untuk Pembangunan Jalan Trans Sulawesi di Kabupaten Pangkep adalah ketidaksepakatan tentang besaran ganti kerugian karena perbedaan dasar penetapan harga ganti kerugian antara pemerintah dengan masyarakat yang disebabkan oleh beberapa faktor komunikasi diantaranya birokrasi, kerangka pikir,psikologis , kepentingan, dan prasangka.
FABRIKASI NANOPARTIKEL MAGNETIK MANGANESE FERRITE (MnFe2O4 ) DENGAN METODE KOPRESIPITASI DAN KAJIAN STRUKTUR KRISTALNYA
No full textNanopartikel magnetik manganese ferrite ( ) telah berhasil disintesis dari Iron (III) Chloride Hexahydrate ( ) dan Manganese (II) Sulfate Hydrate ( ) dengan metode kopresipitasi dengan menvariasikan suhu sintesis dan konsentrasi NaOH (kopresipitan). Hasil analisa X-Ray Diffraction (XRD) menunjukkan bahwa ukuran nanopartikel meningkat seiring meningkatnya suhu sintesis (room temperature (27 ), , dan ) dengan ukuran partikel secara berturut-turut sebesar 9,4 nm, 14,9 nm, dan 18,6 nm. Sedangkan dengan menaikkan konsentrasi NaOH (1,5M, 5M, dan 10M) diperoleh ukuran partikel sebesar 25,4 nm, 18,6 nm, dan 14,8 nm. Adapun hasil analisa morfologi partikel diperoleh dengan menggunakan Transmission Electron Microscopy (TEM), menunjukkan ukuran partikel sekitar 14,0 nm dengan konsentrasi NaOH 10M pada suhu .
Kata kunci : nanopartikel, manganese ferrite ( ), kopresipitas
Analisis Tanggapan Frekuensi Dielektrik Dalam Bahan-Bahan Batuan Alam1 Dan NaCL
No full textTelah ditelaah secara teoritis dan eksperimen gejala dielektrik kompleks dalam bahan-bahan batuan alami dan kristal ionik NaCI, terutama yang berkaitan Iangsung dengan tanggapan frekuensinya terhadap medan listrik AR (arus rangga). Besaran yang menjadi pusat perhatian adalah tetapan dielektrik kompleks bahan yang mengikutsertakan gejala lesapan (dissipasi) energi elektromagnetik melalui pemunculan besaran rugi dielektrik.
Hasilnya menunjukkan jelas adanya pengaruh frekuensi terhadap tetapan dielektrik kompleks, baik bagian imajinernya maupun bagian realnya, dan setiap cuplikan mempunyai frekuensi kritis berbeda, yaitu frekuensi yang menimbulkan dissipasi energi maksimum.
Dan kajian ini juga berhasii diperoleh nilai-nilai parameter dielektrik Iainnya seperti indeks bias, tetapan dielektrik AS (arus searah) dan waktu relaksasi yang menyatakan waktu yang diperlukan untuk berlangsungnya tumbukan dalam bahan yang menimbulkan dissipasi maksimum.
Kata-kata kunci : Dielektrik, Batuan Alami
Recent Development of Magnetic Recording Head Materials for Hard Disk Drive (HDD) Device
No full textMagnetite (Fe3O4) Nanoparticle Synthesis using Silica (SiO2) Template and Magnetic Properties Characterisation
No full textNanoparticles of magnetite (Fe3O4) have been successfully synthesized by coprecipitation method by mixing FeSO4.7H2O and FeCl3.6H2O with the addition of 10% NH4OH as kopresipitan. Then, functionalized Fe3O4 concentration variation silica (SiO2) 5%, 10%, 15%, 20%, 30% and 50%. Particle size and magnetic properties of Fe3O4 nanoparticles were tested by X-Ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM). XRD results showed the addition of silica is not found new phases when added SiO2that serves as a template. The particle size of Fe3O4 nanoparticles obtained 14.23 nm, while the Fe3O4nanoparticles with the addition of a concentration of 5% and 20% respectively SiO215.45 nm and 16.37 nm. VSM results show the value of saturation magnetization and remanent magnetization decreased as more silica concentration, and increased coercivity field. Test Results of Fourier Transform Infra Red (FTIR) obtained new peaks which indicate that the functionalization process Fe3O4 with silica has been successfully carried out
Characterization of Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) and Silica Encapsulated Mn0.5Zn0.5Fe2O4 Nanoparticles
No full textIn this research has been successfully Mn0.5Zn0.5Fe2O4 nanoparticles synthesis using co-precipitation method and their encapsulation by varying the concentration of polyethylene glycol (PEG-4000) and silica. The result of X-Ray Diffraction (XRD) characterization showed that Mn0.5Zn0.5Fe2O4 nanoparticles was mix spinel crystal structure. There was a phase other than Mn0.5Zn0.5Fe2O4 phase synthesized that a-Fe2O3 phase before and after encapsulated with PEG-4000 and silica. Encapsulation of silica has showed a new diffraction peak (222) because silica was crystal. Mn0.5Zn0.5Fe2O4 particle size before and after encapsulated with PEG-4000 (50% concentration) and silica (50% concentration) was 27.28±0.26 nm; 19.13±0.13 nm and 32.75±0.55 nm, respectively. The result of Transmission Electron Microscopy (TEM) characterization showed that before encapsulated with PEG-4000 and silica, occur agglomeration, meanwhile after encapsulated, the agglomeration was reduced. The result of Fourier Transform Infra Red (FTIR) characterization showed that Mn0.5Zn0.5Fe2O4 nanoparticles encapsulated with PEG-4000 there was shift in the wavenumbers 2878.00 cm-1 to 2885.51 cm-1 in the functional groups C-H and wavenumbers 1103.28 cm-1 to 1111.00 cm-1 in the functional groups C-O-C. Both of those functional groups was a constituent bond PEG-4000. Bonding metal oxide (M-O) was shift the wavenumbers 578.64 cm-1 to 570.93 cm-1, which was an uniform pattern of Mn0.5Zn0.5Fe2O4. Mn0.5Zn0.5Fe2O4 encapsulated with silica was shown in the wavenumbers 1049.28 cm-1; 779.24 cm-1; and 471.00 cm-1, which is the functional groups Si-O-Si (stretching). The characterization result of Mn0.5Zn0.5Fe2O4 magnetic properties with Vibrating Sample Magnetometer (VSM) showed that the values of coercivity, magnetization (at H = 15 kOe) and remnant magnetization was 47.55 Oe, 10.41 emu/g, 1.40 emu/g. After Mn0.5Zn0.5Fe2O4 nanoparticles encapsulated with PEG-4000 and silica was decreased amounting to 45.80 Oe, 45.64 Oe, 10.32 emu/g, 1.34 emu/g, 0.28 emu/g and 0.07 emu/g, respectively
KAJIAN SIFAT KEMAGNETAN PADA NANOPARTIKEL COBALT FERRITE (CoFe2O4) YANG DIENKAPSULASI DENGAN POLYETHYLENE GLYKOL (PEG-4000) DAN SILIKA
No full textMagnetic nanoparticles of Cobalt ferrite (CoFe2O4) have been succesfully
encapsulated with various concentration of PEG-4000 and silica which used as
materials for encapsulation. CoFe2O4 powder shynthesized by co-presipitation
method. X-ray Diffraction (XRD) showed that after PEG-4000 encapsulated
appears new phases on CoFe2O4. It was which is
antiferromagnetic and which is paramagnetic. Both of phases was
decrease sample respons by eksternal field. Encapsulated of silica has showed the
new diffraction peaks, (222) and (331). Transmission Electron Microscopy (TEM)
analysis showed that encapsulated PEG-4000 and silica given decreasing
agglomeration, controlled shape of nanoparticles more spherical and dispersed.
Nanoparticle�s size and degree of crystallinity, increased with increasing
concentration of silica. Vibrating Sample Magnetometer VSM analysis show that
process of encapsulation by PEG-4000 and silica increasing coersivive field,
decreasing saturation and remanent magnetizatio
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