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All Journal Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Riset Industri Jurnal Zeolit Indonesia Padjadjaran Journal of Dentistry E-Prodenta Journal of Dentistry Jurnal Material Kedokteran Gigi
Bambang Sunendar Purwasasmita, Bambang Sunendar
Institut Teknologi Bandung
Biochemistry, Genetics & Molecular Biology Dentistry Education Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health

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SINTESIS NANO KRISTALIN KOMPOSIT ALUMINA-ZIRKONIA DENGAN TEMPLATE PULP ORYZA SATIVA MELALUI METODE KALSINASI PREKURSOR Edwin, Frank; Purwasasmita, Bambang Sunendar; ., Suhanda; Septawendar, Rifki; NurdiWijayanto, Leanddas
Jurnal Riset Industri Vol 5, No 1 (2011): Industri Kecil Menengah
Publisher : Badan Penelitian dan Pengembangan Industri

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Abstract

Nano kristalin komposit alumina-zirkonia disintesis melalui metode kalsinasi prekursor dengan pulp oryza sativasebagai template serta Al(NO3)3.9H2O dan ZrCl4 sebagai prekursor dengan komposisi molar 80:20. Pencampuranprekursor, pelarut, dan pulp menggunakan ultra turrax T25 pada RPM 15000 selama 3 menit sebanyak 3 kali.Kalsinasi yang ditujukan untuk memperbaiki morfologi dan pembentukan fasa dilakukan pada temperatur 900,1000, 1100, 1200, dan 1250°C. Untuk mengetahui sifat-sifat dari material komposit yang terbentuk, dilakukankarakterisasi X-Ray Diffraction (XRD) dan Scanning Electron Microscope (SEM). Dari hasil XRD, dapatdiidentifikasi fasa dari komposit yang muncul, yaitu tetragonal-zirkonia, monoklinik-zirkonia, dan δ-alumina. Fasatunggal tetragonal-zirkonia muncul pada sampel yang dikalsinasi pada temperatur 900-1100°C, sementarasampel yang dikalsinasi pada temperatur yang lebih tinggi menghasilkan fasa campuran antara tetragonalzirkoniadan monoklinik-zirkonia. Dari hasil SEM, terlihat bahwa morfologi partikel memiliki bentuk menyerupaibentuk dari pulp, yang mana bentuk ini merupakan akibat dari pencampuran dengan kecepatan tinggi.Kata kunci: Komposit, Alumina-Zirkonia, Tetragonal-Zirkonia, Monoklinik-Zirkonia, Pulp.
SYNTHESIS MATERIAL OF ZEOLITE NANOPOROUS (ZSM-5) FROM COAL FLY ASH Purwasasmita, Bambang Sunendar; Kurnia, Agung; Wibowo, Arie
Jurnal Zeolit Indonesia Vol 9, No 1 (2010)
Publisher : Jurnal Zeolit Indonesia

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Abstract

Coal fly ash (CFA) is the waste of coal usage that requires serious attention on handling because it is have the large quantity and containing a dangerous substances for environmental. The interesting method of waste processing of CFA is using CFA as zeolite raw material because CFA have a rich silicate and alumina. In this study, CFA is used as a raw material for zeolite synthesis nanoporous (ZSM-5) so that expected could be a solution for waste processing of CFA and also could be deliver a valuable materials that needed on many applications. Based on the result of characterization XRD and SEM, was known that structure of ZSM-5 and other zeolites (Na12Al12Si12O48.27H2O and Na0,3Al2,564Si100O203,996) have been successfully synthesized on hydrothermal processing at temperature of 97°C and the pressure of 1,3 bar.
Synthesis of mesh-shaped calcia partially stabilized zirconia using eggshell membrane template as filler composite Gempita, Gema; Hasratiningsih, Zulia; Subrata, Gantini; Purwasasmita, Bambang Sunendar
Padjadjaran Journal of Dentistry Vol 29, No 2 (2017): July
Publisher : Faculty of Dentistry Universitas Padjadjaran, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.837 KB) | DOI: 10.24198/pjd.vol29no2.13603

Abstract

Introduction: This experiment was conducted experimentally to synthesize Calcia Partially Stabilized Zirconia (Ca-PSZ) by sol-gel method using eggshell membrane template as a composite filler. The eggshell membrane was used to produce a mesh shaped structure, which hopefully can improve the mechanical properties of the composite. Method: Ca-PSZ filler was synthesized from ZrOCl2 precursor and Ca(NO3)2 stabilizer with a 24 hours immersion time. Ca-PSZ of synthesis then mixed with the resin matrix to test its composite hardness. Result: The EDS characterization results suggested that the sample contained elements of zirconia, calcium, and oxygen. Whereas, the XRD characterization identified that crystal structures that formed in the sample were nano scale tetragonal. Characterization of SEM showed Ca-PSZ with mesh structured. The average composite hardness value was 15.79 VHN. Conclusion: The composites with Ca-PSZ-synthesized filler could be prepared and its hardness value was higher than the composite with Ca-PSZ filler in spherical particles, but the hardness was still below the composite on the market.
Effect of chitosan as a coupling agent and types of stabiliser of zirconia filler on nanocomposite hardness Putri, Tansza Permata Setiana; Manurung, Rosida; Usri, Kosterman; Purwasasmita, Bambang Sunendar
Padjadjaran Journal of Dentistry Vol 30, No 1 (2018): March
Publisher : Faculty of Dentistry Universitas Padjadjaran, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.602 KB) | DOI: 10.24198/pjd.vol30no1.16101

Abstract

Introduction: Nanocomposite has been developed as a dental restoration. Nano-scale filler can result in high mechanical properties and good esthetic. Nanofiller materials such as partially stabilised zirconia (PSZ) has been recommended for dental use. This form of zirconia can be stabilised by the addition of several different oxides such as magnesia and calcia. Chitosan as a coupling agent was able to increase the nanocomposite’s mechanical properties. The purpose of this research was to evaluate the nanocomposite’s hardness value with and without the addition of chitosan as a coupling agent as well as a different stabiliser of zirconia filler. Methods: Procedures of this research consisted of several stages which were the fabrication of nanocomposite and mechanical properties measurement using the Vicker’s hardness testing. Results: The nanocomposite’s hardness value (kg/mm2) with zirconia filler stabilised by MgO without the addition of chitosan was as much as 5.09 and with the addition of chitosan was 7.51; the nanocomposite ’s hardness number with zirconia filler stabilised by  CaO without the addition of chitosan was 8.16 and with the addition of chitosan was 13.13.  The results were then analysed statistically using the Analysis of Variance (ANOVA) test and showed a significant difference between all of those data groups. Conclusion: The addition of chitosan as well as different stabiliser (MgO and CaO) of Zirconia filler had affected the nanocomposite ’s hardness value.
Pengaruh Morfologi Serbuk Silika Nanopartikel Terhadap Efektivitas Poles Pewarnaan Gigi Siagian, Rivita; Evelyna, Angela; Purwasasmita, Bambang Sunendar
Jurnal Material Kedokteran Gigi Vol 3 No 2 (2014): JMKG Vol 3 No 2 September 2014
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

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Abstract

Silica is a product which is produced from hydrated silica available in a variety of particle sizes and characteristics. Silica is easy to find and mechanically used as stain remover. Large size of silica particles can cause deep scratches on the teeth and restaining can occurred so that nanoscale be used. The aim of this research to determine the result test from synthesis silica nanoscale with morphology nanosphere and nanorod and differences effectiveness of abrasion with different morphology. This research was an experimental study with 27 sample divided into three groups. The first group were polished with silica nanosphere, the second group with silica nanorod and the third group with a mixture of both silica. Tooth samples was captured then flowed by a solution of coffee during 2 months until the color changes and last taken picture of it. The tooth staining was polished with three body wear process with three abrasive particles from three groups was applied use to rubber cup and low speed handpiece then analyzed using software image J. The data were statistically analyzed using ANAVA test with p<0,05 and continued with unpaired t-test. Research conclude that the result test of synthesis nanoparticle silica obtained morphology nanosphere and nanorod and there are also differences effectiveness abrasion of silica with different morphology.
SINTESIS DAN OPTIMASI SIFAT FOTOLUMINESENS FOSFOR BCNO/SIO2 DENGAN MODIFIKASI SUMBER KARBON Anggreani, Triannisa Julia Dian; Purwasasmita, Bambang Sunendar; Nuruddin, Ahmad
Wahana Fisika Vol 3, No 1 (2018): JUNE
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/wafi.v3i1.11079

Abstract

Dalam penggunaannya sebagai light emitting diode (LED) putih, fosfor Boron Carbon Oxy-Nitride Silika (BCNO/SiO2) terus dikembangkan sebagai alternatif penggunaan fosfor dengan oksida tanah jarang. Pada penelitian ini dilakukan proses sintesis fosfor BCNO/SiO2 dengan memanfaatkan bahan-bahan alam yang mudah ditemukan di Indonesia. Prekursor yang digunakan meliputi asam borat sebagai sumber boron dan urea sebagai sumber nitrogen, sedangkan sebagai sumber karbon digunakan pati dari tepung tapioka dan selulosa yang diekstraksi dari tanaman rami. Sintesis material fosfor BCNO/SiO2 dilakukan dengan metode sol-gel dengan perbandingan molar Nitrogen/Boron sebesar 20, dan komposisi karbon 3% dan 10% wt. Nanopartikel silika kemudian ditambahkan dengan perbandingan 3% wt. Kalsinasi dilakukan pada suhu 600°C selama 60 menit dalam kondisi tekanan atmosfer. Dengan penyinaran sinar UV didapatkan hasil bahwa pendaran dengan intensitas paling tinggi terjadi pada fosfor BCNO/SiO2 yang disintesis dengan sumber karbon pati dengan kandungan 100% wt dan nanopartikel silika 200 nm, dan juga fosfor BCNO/SiO2 yang disintesis dengan sumber karbon pati dengan kandungan 3% wt dan nanopartikel silika 50 nm dan 200 nm. Hasil penelitian ini menunjukkan bahwa material fosfor alternatif yang disintesis dengan cara sederhana dan temperatur rendah dapat menjadi kandidat yang menjanjikan untuk LED putih. Within its usage for white light emitting diode (white-LED), Boron Carbon Oxy-Nitride Silica (BCNO/SiO2) phosphor is continuously being developed as an alternative to rare-earth oxide phosphor. In this research, the synthesis of BCNO/SiO2 phosphor is done by the use of natural resources that are easily found in Indonesia. The precursors used are boric acid as boron source, urea as nitrogen source, and starch from tapioca flour and cellulose extracted from ramie as carbon source. The synthesis process is carried out by sol-gel method with molar ratio of Nitrogen/Boron 20, and carbon composition 3% and 10% wt. Calcination process is carried out at 600°C temperature for 60 minutes under atmospheric pressure condition. Upon illumination under UV rays, the highest intensity occurred in the BCNO/SiO2 phosphor that was synthesized with 10% wt starch as carbon source and 200 nm silica nanoparticles, and in the BCNO/SiO2 phosphor that was synthesized with 3% wt starch as carbon source and silica nanoparticles with 50 nm and 200 nm in size. The outcome of this research showed that alternative phosphor material that was synthesized using facile method under low temperature could be a promising candidate for white-LED.Keywords:   Boron Carbon Oxy-Nitride (BCNO); silica nanoparticles; cellulose; white-LED.
Penambahan Nanoselulosa Sekam Padi (Oryza Sativa L) Terhadap Kekuatan Fleksural Basis Gigitiruan Resin Akrilik Polimerisasi Panas Riyadi, Wisnu; Purwasasmita, Bambang Sunendar; Imam, Dian Noviyanti Agus
E-Prodenta Journal of Dentistry Vol 4, No 2 (2020)
Publisher : Fakultas Kedokteran Gigi UB

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Abstract

Latar Belakang : Basis gigitiruan berfungsi untuk tempat anasir gigi dan sebagai pengganti tulang alveolar yang hilang. Resin akrilik polimerisasi panas merupakan bahan basis gigitiruan yang sering digunakan. Penambahan bahan alam pada bahan resin digunakan untuk memperbaiki kekuatan fleksuralnya, seperti nanoselulosa sekam padi. Tujuan : untuk mengetahui kekuatan fleksural dan karakteristik morfologi permukaan dari basis gigitiruan resin akrilik polimerisasi panas yang ditambahkan nanoselulosa sekam padi (Oryza sativa L). Metode : Penelitian eksperimental laboratoris murni dengan post test only control group design. Sampel terdiri dari empat puluh delapan sampel yang dibagi 6 kelompok, yaitu resin akrilik polimerisasi panas yang ditambahkan nanoselulosa 1%, 2%, 3%, 4%, 5%, dan resin akrilik polimerisasi panas tanpa penambahan nanoselulosa. Uji kekuatan fleksural dilakukan menggunakan metode three point bending dan pengamatan karakteristik permukaan dilakukan menggunakan SEM. Hasil : Kelompok resin akrilik dengan penambahan nanoselulosa 5% memiliki kekuatan fleksural tertinggi (79,62 MPa), sedangkan kelompok resin akrilik tanpa penambahan nanoselulosa memiliki kekuaran fleksural terendah (60,55 MPa). Terdapat perbedaan bermakna hasil uji kekuatan fleksural masing-masing kelompok perlakuan dan kontrol (p<0,05). Hasil uji SEM pada setiap kelompok sudah menunjukkan gambaran yang homogen namun masih memiliki sedikit aglomerasi dan porositas. Kesimpulan : nanoselulosa sekam padi dapat meningkatkan kekuatan fleksural basis gigitiruan resin akrilik polimerisasi panas.  Katakunci : Nanoselulosa, kekuatan fleksural, gigituran, resin akrilik polimerisasi panas, sekam padi.
Co-Authors Agung Kurnia Ahmad Nuruddin, Ahmad Anggreani, Triannisa Julia Dian Arie Wibowo Dian Noviyanti Agus Imam, Dian Noviyanti Agus Evelyna, Angela Frank Edwin, Frank Gantini Subrata, Gantini Gema Gempita, Gema Kosterman Usri, Kosterman Leanddas NurdiWijayanto, Leanddas Putri, Tansza Permata Setiana Rifki Septawendar Riyadi, Wisnu Rosida Manurung, Rosida Siagian, Rivita Suhanda ., Suhanda Zulia Hasratiningsih, Zulia