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Rifki Septawendar
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INDONESIA
Jurnal Keramik dan Gelas Indonesia
Published by Balai Besar Keramik
ISSN : 08545405     EISSN : 26228114     DOI : https://doi.org/10.32537/jkgi
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Materials Science & Nanotechnology
The JKGI contains papers of original research that provide or lead to fundamental principles in the science of ceramics, functional ceramics and ceramic-based composites. These articles include reports of the discovery of new phases, phase relationships, processing approaches and microstructures that relate to ceramic materials and processes. The articles establish the links between processing, structure characterization and properties of ceramics, including modeling approaches that are founded on basic mechanisms. All the published papers must be of enduring value and relevant to the field of ceramics.
Arjuna Subject : Ilmu Material (semua kategori) - Keramik dan Komposit
Articles 72 Documents
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Sintesis Metanol Dengan Reaksi Fischer-Tropsch Menggunakan Katalis Cu/SiO2 Poltak Tua Dorens Ambarita; Djulia Onggo; I Nyoman Marsih
Jurnal Keramik dan Gelas Indonesia Vol 27, No 2 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v27i2.4383

Abstract

Pada penelitian ini telah dilakukan sintesis metanol dengan menggunakan katalis Cu/SiO2 dengan kadar 8 %-b/b. Katalis tersebut dipreparasi dengan metode incipient wetness dari prekursor garam Cu(NO3)2.3H2O, dengan material pendukung silika gel yang ukuran partikelnya 60-100 mesh. Katalis direduksi menggunakan hidrogen pada tekanan satu atmosfer pada suhu 40oC selama enam jam dalam mikro-reaktor, dan selanjutnya dilakukan percobaan reaksi FischerTropschdengan mengganti aliran hidrogen dengan alirancampuran gas CO dan gas H2 dengan perbandingan 1:2.Reaksi Fischer-Tropsch dilakukan pada suhu 200 oC dan 250 oC. Campuran gas hasil reaksi dijebak dalam penampung sampel dan dianalisis dengan metode kromatografi gas secara kualitatif dan kuantitatif. Pada percobaan ini, laju pembentukan metanol diperoleh sebesar 3,333 µmol g-1h-1; 4,996 µmolg-1h-1;dan 3,368 µmol.g-1h-1 masing-masing untuk suhu 200 oC, 250 oC,dan 300oC. 
Density and Magnetic Properties of Barium Ferrite from BaFe12O19 Nanoparticles Prepared by Microemulsion Method Handoko Setyo Kuncoro; Naniek Sulistarihani; Ria Julyana Manullang; Maulid Purnawan; Ratih Resti Astari
Jurnal Keramik dan Gelas Indonesia Vol 24, No 2 (2015): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v24i2.2339

Abstract

The density and magnetic properties of barium ferrite from BaFe12O19 Nanoparticles prepared by microemulsion method have been studied by comparing with the properties of micro-scaled BaFe12O19 prepared by metallurgical method. The preceding preparation consists of emulsification process, mixing, aging, centrifuging/separation, drying, grinding, and calcination at temperature of 900 oC, which brings on  the BaFe12O19 nanoparticles powder as its final product. Then, the obtained powders have been formed at compaction pressure of 200 Kg/cm2 and sintered at temperature of 1100 oC. The indications of formed BaFe12O19 nanoparticles have been confirmed via XRD and TEM testings which their dimension sizes are under 100 nm. Based on density measurements, the density of barium ferrite prepared by microemulsion method is higher than that of by metalurgical method (i.e. 5,3 gr/ml). While, the permagraph examinations have indicated that both remanence magnetic induction (2.49 kOe) and maximum energy product values (0.47 MGOe) of barium ferrite prepared by microemulsion method are higher about 1.22 and 1.47 times, respectively.
Effect of Precursor on the Mineralogy and Microstructure Characteristic of Nano Zirconia by Template Method Naili Sofiyaningsih; Suhanda Suhanda; Rifki Septawendar
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6237

Abstract

Nano zirconia     were successfully synthesized from Zr(OH)4 dan ZrOCl2 using a template method. Polyvinyl alcohol was added as a template or a surfactant to control the particle size of nano zirconia. Zirconia precursors were reacted with polyvinil alcohol at a stoichiometric and nonstoichiometric ratio in water solvent at about pH 4 and then calcined at a temperature of 800⁰C. The result showed the precursor types obviously affected the mineralogy and microstructure characteristics of nano zirconia.  The reaction between Zr(OH)4 and polyvinyl alcohol produces tetragonal zirconia in the form of nanorods with a diameter of 100 nm and 500 nm - 1μm in length, and elongated agglomerates consisting of nanoparticles less than 100 nm in sizes. Meanwhile, the reaction between ZrOCl2 precursor with polivinyl alcohol at pH 4 leaded to formation of monoclinic zirconia with microstructures such as nanorods with diameter of 10~100 nm and 100~500 nm in length, agglomeration of nanoparticles <100 nm, and  packing sheets.
X-Ray Diffraction Characterization of Hydroxyapatite Crystal Modified with MgCO3 and CaCO3 Ayu Ratnasari; Herlina Damayanti; Kristanto Wahyudi
Jurnal Keramik dan Gelas Indonesia Vol 28, No 2 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v28i2.5781

Abstract

Modifikasi kristal hidroksiapatit yang sudah dihasilkan Balai Besar Keramik (BBK) dengan kalsium karbonat dan magnesium karbonat dilakukan dengan metode drymechanochemical. Metode ini hanya memanfaatkan energi kecil yang dihasilkan dari giling mekanik. Campuran digiling kering kemudian dikarakterisasi dengan X-Ray Diffraction (XRD). Puncak kalsium karbonat masih terbentuk dari hasil XRD karena ikatannya sangat kuat sehingga tidak dapat masuk ke dalam kristal hidroksiapatit. Modifikasi dengan magnesium karbonat menunjukkan bahwa ada puncak MgO, dimana ikatan antara magnesium dan karbonat terpecah. Variasi waktu giling dilakukan dari 12, 24, 36, dan 48 jam. Didapatkan bahwa pada waktu giling 48 jam, ikatan magnesium karbonat lepas secara optimum dilihat dari puncak XRD yang terbentuk.  Kata Kunci: hidroksiapatit, x-ray diffraction, drymechanochemical
Study of Technoeconomic Synthetic Bone Ash Production Abdul Rachman; Kristanto Wahyudi
Jurnal Keramik dan Gelas Indonesia Vol 26, No 1 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i1.3918

Abstract

Balai Besar Keramik has succeeded in producing synthetic bone ash from natural limestone and phosphoric acid. Characteristic of synthetic bone ash has a purity of  ≥  98%, white degree (brightness 90.59 and whiteness 89,42), ratio of Ca / P 1,64. Synthetic Bone ash is not inferior to bone ash from bovine bone combustion so it can be used as an alternative raw material for bone china ceramic body. The technoeconomic studies have been analyzed with assumption for the production capacity of 30 tons per month of synthetic bone ash, 5 years investment age will require initial investment cost of Rp. 3,667,083,700, - and total production cost per year is Rp. 4.059.279.000, -. With the selling price of synthetic bone ash products Rp.16.000, - / kg, will get the value of NPV in the 5th year of Rp. 557.517.242,27, -, IRR of 18.36%,  BCR of 1,135, BEP units: 982,774 kg, BEP sales: Rp. 15,724,389,020, - and Payback Period is 3.08 years. The results indicate that bone ash production is feasible according to financial criteria.
The Influence of Barium Ferrite and NdFeB Compositions on Magnetic Properties of The BaFe/NdFeB Composite Handoko Setyo Kuncoro; Ratih Resti Astari; Tita Oktavia Cahya Rahayu
Jurnal Keramik dan Gelas Indonesia Vol 25, No 1 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v25i1.2350

Abstract

Studi tentang pengaruh komposisi bahan-bahan sumber (penyusun) terhadap sifat kemagnetan komposit magnet BaFe/NdFeB beserta sintesis barium ferit dan NdFeB yang dibantu binder PEG (polyethylene glycol) 6000. Keberhasilan sintesis bahan komposit tersebut bisa ditunjukkan dengan beberapa hasil pengujian seperti pengujian SEM, uji gores, dan pengujian DTA/TG. Morfologi dari komposit yang dibentuk dari bahan sumber (BaFe, NdFeB dan binder PEG) bisa teridentifikasi dengan baik oleh mikrograf SEM. Hasil uji gores menunjukkan bahwa penambahan binder PEG 6000 terbaik adalah 7,5% dari berat total. Sedangkan hasil uji DTA/TG memberikan data suhu degradasi termal komposit minimum (350°C) masih dibawah temperatur Curie bahan NdFeB. Hasil penelitian juga membuktikan bahwa komposisi  bahan sumber komposit kurang berpengaruh terhadap sifat koersifitas magnetik tetapi lebih mempengaruhi terhadap sifat retentivitas magnet (induksi remanen) komposit BaFe/NdFeB. Tren pengaruh komposisi bahan penyusun terhadap sifat induksi remanen magnetik (Br) kompositnya mendekati formulasi untuk menghitung konduktivitas komposit.
The Preparation Hydroxyapatite – Zirconia Composites as Bioceramic Materials Eneng Maryani; Sri Cicih Kurniasih; Naili Sofiyaningsih; Bayu Priyanto
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v27i1.4038

Abstract

Hydroxyapatite (HAP) is a material often used as a bioceramic because of its special characteristics such as has the same mineral composition as the original bone and teeth, does not cause cytotoxic effects, biocompatible, bioactive and promote osteoconductivity. However HAP shows poor mechanical properties so it is less applicable to biological applications that must accept heavy loads. Therefore, it is necessary to modify the hydroxyapatite structure through the process of reinforcement (composite formation) with other materials such as zirconia (ZrO2). In this research, hydroxyapatite – zirconia composite prepared from each component made from local natural mineral. The compositions of prepared hydroxyapatite – zirconia composites are 75:25, 50:50, and 25:75. In all composite compositions prepared after calcination at 1000 oC, hydroxyapatite phase change into whitlockite and tetrahedral zirconia phase formed. Composite of HAP-ZrO2 =75:25 is the most suitable proportion because they still the highest hydroxyapatite content and all zirconia is in the tetrahedral phase
Study of Reduced Graphene Oxide addition on the Electrical Conductivity and Flexural Strength of Metakaolin-based Geopolymer Elsy Rahimi Chaldun; Andrie Harmaji; Nindya Kirana Prabaswari; Lina Nur Listiyowati; Achmad Subhan; Syoni Soepriyanto
Jurnal Keramik dan Gelas Indonesia Vol 29, No 1 (2020): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v29i1.6048

Abstract

Geopolymer with reduced Graphene Oxide (rGO) composite obtanined through Hummers method. This material is a substitute option for graphene because the nature of rGO is easier to produce in large quantities. In theory, it is expected that rGO can increase the flexural strength and electrical conductivity of geopolymer. The rGO composition used varies from 0-1 wt%. Geopolymer and their constituents were characterized by the Three Point Bending, EIS, SEM, FTIR, XRD, and XRF tests. Fly ash-based geopolymers have a flexural strength of 5.2 MPa at a composition of 0.5 wt% rGO, while metakaolin-based geopolymers with an addition of 0.25% rGO produce the highest flexural strength of 5.53 MPa. A frequency of 100,000 Hz tends to facilitate greater electrical conductivity, on fly ash-based geopolymers found electrical conductivity of 5.08 x 10-3 S / m, while for metakaolin-based geopolymers the electrical conductivity is higher ie 1.01 x 10-1 S / m. 
Studi Sifat Elektronik Lapisan Nano Tunggal Sic 3c Dengan Metode Perhitungan Prinsip Pertama Muhammad Syaifun Nizar; Ayu Ratnasari
Jurnal Keramik dan Gelas Indonesia Vol 26, No 2 (2017): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v26i2.4122

Abstract

Perkembangan teknologi saat ini membutuhkan semikonduktor dengan performa yang tinggi dan mengarah kepada fabrikasi transistor dengan ukuran proses node dibawah 14 nm. SiC 3C mempunyai potensi untuk dijadikan semikonduktor menggantikan semikonduktor berbasis silikon karena memiliki sifat tahan temperatur tinggi dan memikliki celah pita energi yang lebar. Sifat listrik bahan pada skala nano masih masih harus banyak penelitian yang perlu dilakukan supaya bisa dipakai sebagai bahan semikonduktor. Dengan menggunakan prinsip pertama, sifat listrik suatu bahan pada ukuran skala nano dapat diprediksi dengan simulasi komputasi, sifat elektronik lapisan tunggal nano SiC 3C dihitung density of state dan struktur pita energi. Hasil komputasi SiC 3C lapisan nano tunggal dengan ukuran 1,3 x 1,3 nm ukuran sel kristal 3x3x1 didapatkan celah pita energi sebesar -1.7 eV mirip dengan semikonduktor tipe p dengan pita konduksi minimum berada 8 eV diatas pita valensi.
Sintesis dan Karakterisasi γ-Alumina Nanopartikel dari Garam Nitrat dengan dan tanpa Penambahan Polietilen Glikol (PEG) Raisa Khairani; Heri Setiawan; Bambang Sunendar
Jurnal Keramik dan Gelas Indonesia Vol 25, No 2 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v25i2.2668

Abstract

Gamma alumina (γ-Al2O3) merupakanoksida alumina yang terbentukmelaluidehidrasitermal (kalsinasi) padatemperatur 500 – 750 oCdari prekursor amorf maupun kristalin, yang sangat berpotensi untuk dimanfaatkan sebagai adsorben, katalis temperatur tinggi, support katalis dan sebagai membran filtrasi karena memiliki karakteristik luas permukaan yang besar, bersifat mesopori, serta memiliki ketahanan terhadap bahan kimia, termal dan mekanik. Pada penelitian ini telah berhasil dilakukan sintesis material gamma alumina (γ-Al2O3) dengan prekursor aluminum nitrat (Al(NO3)3.9H2O) dengan dan tanpa penambahan surfaktan polietilen glikol (PEG) 6000 sebagai dispersan dan pengarah struktursatudimensi (templat), dengan proses aging menggunakan ultrasonic bath selama 4 jam pada temperatur ruang. Sebagianbesarpartikelγ-Al2O3+PEG memiliki morfologi berbentuk bulat dan sebagian lagi cenderung berbentuk rod dengan ukuran panjang sekitar 40-70 nm dan diameter 10-20 nm. Material γ-Al2O3+PEG yang dihasilkan berupa serbuk berwarna putih, memiliki luas permukaan yang lebih besar serta ukuran dan volume pori yang lebih kecil dibandingkan dengan γ-Al2O3 tanpa templat, dengan luas permukaan326,26 m2/g, volume pori total 0,10 cm3/g dan diameter pori rata-rata 2.10 nm

Page 2 of 8 | Total Record : 72

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