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All Journal Bionatura Jurnal Sains Materi Indonesia Jurnal Teknologi Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Jurnal Dampak Jurnal Riset Industri Majalah Kedokteran Gigi Indonesia Jurnal Zeolit Indonesia Jurnal Keramik dan Gelas Indonesia Jurnal Ilmiah Arena Tekstil Dental Journal (Majalah Kedokteran Gigi) Journal of Mechanical Engineering Science and Technology Padjadjaran Journal of Dentistry Journal of Science and Applicative Technology Journal Of Vocational Health Studies Indonesian Journal of Chemistry Mesin ENSAINS JOURNAL JURNAL SELULOSA Fullerene Journal of Chemistry E-Prodenta Journal of Dentistry Jurnal Material Kedokteran Gigi Jurnal Teknologi Bahan dan Barang Teknik Jurnal Keramik dan Gelas Indonesia Jurnal Riset Teknologi Pencegahan Pencemaran Industri Journal of Health and Dental Sciences Makara Journal of Science Wahana Fisika : Jurnal Fisika dan Terapannya Sonde (Sound of Dentistry)

Bambang Sunendar P

Institut Teknologi Bandung

Author-ID : 240479

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences

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PENGGUNAAN TiO2 PARTIKEL NANO HASIL SINTESIS BERBASIS AIR MENGGUNAKAN METODA SOL-GEL PADA BAHAN KAPAS SEBAGAI APLIKASI UNTUK TEKSTIL ANTI UV Maya Komalasari; Bambang Sunendar
Arena Tekstil Vol 28, No 1 (2013)
Publisher : Balai Besar Tekstil

Partikel nano TiO2 berbasis air dengan pH basa telah berhasil disintesis dengan menggunakan metode sol-gel dan diimobilisasi pada kain kapas dengan menggunakan kitosan sebagai zat pengikat silang. Sintesis dilakukan dengan prekursor TiCl4 pada konsentrasi 0,3 M, 0,5 M dan 1 M, dan menggunakan templat kanji dengan proses kalsinasi pada suhu 500˚C selama 2 jam. Partikel nano TiO2 diaplikasikan ke kain kapas dengan metoda pad-dry-cure dan menggunakan kitosan sebagai crosslinking agent. Berdasarkan hasil Scanning Electron Microscope (SEM),diketahui bahwa morfologi partikel TiO2 berbentuk spherical dengan ukuran nano (kurang dari 100 nm). Karakterisasi X-Ray Diffraction (XRD) menunjukkan adanya tiga tipe struktur kristal utama, yaitu (100), (101) dan (102) dengan fasa kristal yang terbentuk adalah anatase dan rutile. Pada karakterisasi menggunakan SEM terhadap serbuk dari TiO2 yang telah diaplikasikan ke permukaan kain kapas, terlihat adanya imobilisasi partikel nano TiO2 melalui ikatan hidrogen silang dengan kitosan pada kain kapas. Hasil analisa tersebut kemudian dikonfirmasi dengan FTIR (Fourier Transform Infra Red) yang hasilnya memperlihatkan puncak serapan pada bilangan gelombang 3495 cm-1, 2546 cm-1, dan 511 cm-1, yang masing-masing diasumsikan sebagai adanya vibrasi gugus fungsi O-H, N-H dan Ti-O-Ti. Hasil SEM menunjukkan pula bahwa kristal nano yang terbentuk diantaranya adalah fasa rutile , yang berdasarkan literatur terbukti dapatberfungsi sebagai anti UV.

Preparation of Chitosan-Polyethylene Oxide-Colocasia esculenta Flour Nanofibers using Electrospinning Method Riesca Ayu Kusuma Wardhani; Lia Asri; Muhamad Nasir; Bambang Sunendar Purwasasmita
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 3, No 1 (2019)
Publisher : Universitas Negeri Malang

Nanofibers have been prepared from the mixture of chitosan, polyethylene oxide (PEO) and Colocasia esculenta flour (CE flour) by using the electrospinning method. Two different nanofibers were formulated, containing chitosan-PEO and chitosan-PEO-CE flour. The higher concentration of PEO (3%chitosan-6%PEO) (w/v) resulted in more uniform chitosan-PEO electrospun nanofibers without beads. Chitosan-PEO-CE flour was prepared by addition of colloidal CE flour into the solution containing 3%chitosan-6%PEO with variation of the CE flour concentration of 5, 15 and 25% (w/v). Scanning Electron Microscopy demonstrated that the average diameter of chitosan-PEO nanofibers was 128±41 nm, whereas the diameter of chitosan-PEO-CE flour nanofibers was 159±45 nm. The diameters of nanofibers increased with the increase of CE flour content. Fourier transform infrared spectra demonstrate the presence characteristic peaks of chitosan, PEO and CE flour.

Synthesis and Characterization of Bio-based Nanomaterials from Jabon (Anthocephalus cadamba (Roxb.) Miq) Wood Bark: an Organic Waste Material from Community Forest Sutrisno Sutrisno; Tati Suryati Syamsudin; Eka Mulya Alamsyah; Bambang Sunendar
Journal of Mathematical and Fundamental Sciences Vol. 47 No. 2 (2015)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2015.47.2.7

The application of nanotechnology to produce nanomaterials from renewable bio-based materials, like wood bark, has great potential to benefit the wood processing industry. To support this issue, we investigated the production of bio-based nanomaterials using conventional balls milling. Jabon (Anthocephalus cadamba (Roxb.) Miq) wood bark (JWB), an organic waste material from a community forest was subjected to conventional balls milling for 96 h and was converted into bio-based nanomaterial. The morphology and particle size, chemical components, functional groups and crystallinity of the bio-based nanomaterial were evaluated using scanning electron microscopy (SEM), scanning electron microscopy extended with energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The particle-sizes obtained for the JWB bio-based nanomaterial were between 43 nm to 469 nm and the functional groups were detected as cellulose. The chemical components found were carbon, oxygen, chloride, potassium and calcium, except for the sample produced from sieve type T14, which did not contain chloride. The crystalline structure was calcium oxalate hydrate (C2CaO4.H2O) with crystalline sizes 21 nm and 15 nm, produced from sieve types T14 and T200 respectively.

Evaluation on the Temperature and Calcination Time During Sol-gel Coating of TiO2 on Iron Foam substrate Raden Dadan Ramdan; Luqman Haris; Hendra Hermawan; Bambang Sunendar
Mesin Vol. 26 No. 1 (2017)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2017.26.1.1

Iron foam is iron based material which is widely applied due to its unique properties. However since corrosion is also a problem for this material, coating with innert material is required in enhancing its applications. In the present research, TiO2 coating is performed on iron foam suface by sol-gel dipping method. Focus is given on the study of the effect of calcinations temperature and time on the coating characteristics. TiCl4 is used as the precursor with concentration of 0.3 M, added with 1M HCl solution and chitosan soluation with concentration of 1%. Calcination is performed at temperature of 400, 500 dan 600oC and calcinations time of 1 and 3 hours inside controlled gas furnace using nitrogen atmosphere. Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) characterization data shows that TiO2 particles form on the iron foam substrate. SEM characterization on the sample heated at 400oC and heating time of 1 hour shows the formation of nano particle titania (0.06 Î¼m) which is homogeneously distributed with less agglomeration than others and considered as the best sample in the present research. As the temperature and time of calcinations increase, more inhomogeneous particle distribution and bigger particles form.

PENGARUH WAKTU CURING TERHADAP KUAT TEKAN GEOPOLIMER BERBASIS FLY ASH Andrie Harmaji; Claudia Claudia; Lia Asri; Bambang Sunendar; Ahmad Nuruddin
ENSAINS JOURNAL Vol 2, No 1 (2019): ENSAINS Journal Januari 2019
Publisher : UNIVERSITAS KEBANGSAAN

Abstract:. Suralaya power plant produces fly ash about 219.000 ton per year. Fly ash contents of silica and alumina as major components that can be used as precursors for geopolymer, a three dimensional networks aluminosilicate polymers. This research aim is to utilize fly ash for geopolymer made by mixing fly ash, fine aggregate, and alkali activator in a cubic mould and curing was carried out at room temperature for 7 and 28 days. After 28 days of curing the compressive strength of geopolymer reached 41.70 MPa. XRD characterization shows Albite (NaAlSi3O8) formation which has similarity to geopolymer compound. Fourier Transform Infra Red spectra show siloxo and sialate bond. These are typical functional groups that are found in geopolymer materials.Keyword: geopolymer, fly ash, aluminosilicate, alkali activator, albite, siloxo, sialateAbstrak: Pembangkit Listrik Tenaga Uap (PLTU) Suralaya menghasilkan fly ash (abu terbang) sekitar 219.000 ton per tahun. Fly ash memiliki silika dan alumina sebagai komponen utama yang dapat digunakan sebagai prekursor untuk geopolimer, suatu material polimer aluminosilikat tiga dimensi. Penelitian ini bertujuan untuk memanfaatkan fly ash untuk geopolimer yang dibuat dengan mencampur fly ash, agregat halus, dan aktivator alkali dalam cetakan kubik dan pengawetan dilakukan pada suhu kamar selama 7 dan 28 hari. Setelah 28 hari curing kekuatan tekan geopolimer mencapai 41,70 MPa. Karakterisasi XRD menunjukkan pembentukan Albite (NaAlSi3O8) yang memiliki kemiripan dengan senyawa geopolimer. Hasil spektroskopi Fourier Transform Infra Red (FTIR) menunjukkan ikatan siloxo dan sialate yang merupakan gugus fungsional khas yang ditemukan dalam geopolimer.Kata Kunci: geopolimer, abu terbang, aluminosilikat, alkali aktivator, albite, siloxo, sialate

SINTESIS PARTIKEL NANO BARIUM TITANAT MENGGUNAKAN METODE PROSES PREKURSOR DENGAN PULP MERANG SEBAGAI TEMPLAT Bambang Sunendar P; Mery Agustina; Arie Wibowo; Evi Oktavia
JURNAL SELULOSA Vol 45, No 02 (2010): BERITA SELULOSA
Publisher : Center for Pulp and Paper

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1166.654 KB)

Barium titanate (BaTiO3) with perovskite tetragonal crystal structure is known as ferroelectric materials. Recently, this material is widely used in electronic industry such as sensor, transducer, infrared detector and Multi Layer Ceramic Capacitors (MLCCs) because barium titanate is more environmental friendly, the T curie of barium titanate is lower than the other dielectric materials and it has a high dielectric constant. Nanoparticle size of barium titanate is needed to improve the it’s performance. Conventional method of material synthesizing usually produces impurities from ball milling process and the particle size of material is not in nano size. This experiment, we synthesize barium titanate using precursor process method with pulp of rice straw (Oryza sativa) as a template. Variation in calcination temperature (700°C, 900°C, 1100°C) and precursor concentration (0.1 M and 0.07 M) was conducted to get information about the influence of calcination temperature and precursor concentration to the cristallinity and particle size of barium titanate. XRD result showed that barium titanante was already formed in 700ºC calcination temperature and has its optimum temperature on 900ºC. As the concequence of rising of calcination temperature, cristallinity of sample was increased. SEM images showed that particle size of sample was already in nano size. Meanwhile, as the result of decreasing of precursor concentration, the particle size of sample was decreased. Key words : barium titanate, nano particle, pulp Oryza sativa, precursor process method INTISARIBarium titanat (BaTiO3) dengan struktur kristal perovskite tetragonal telah dikenal bersifat material ferroelektrik. Material ini telah banyak digunakan dalam aplikasi di bidang elektronik seperti sensor, transducers, infrared detector dan multi layer ceramic capacitor (MLCCs). Hal ini dikarenakan barium titanat lebih ramah lingkungan, memiliki T curie yang lebih rendah daripada material dielektrik lain, dan memiliki konstanta dielektrik yang tinggi. Partikel barium titanat yang berukuran nano diperlukan untuk meningkatkan kinerjanya. Metode konvensional dalam memproses material seringkali menimbulkan pengotor yang berasal dari proses ball milling serta ukuran partikel yang didapatkan belum mencapai nano. Dalam penelitian ini, partikel titanat berukuran nano partikel disintesis dengan menggunakan metode proses prekursor dengan pulp merang (Oryza sativa) sebagai template. Variasi suhu kalsinasi (700°C, 900°C, 1100°C) dan konsentrasi prekursor (0,1 M dan 0,07 M) dilakukan untuk mengetahui pengaruh suhu kalsinasi dan konsentrasi prekursor terhadap kristalinitas dan ukuran partikel barium titanat. Hasil XRD menunjukkan bahwa pada suhu kalsinasi 700ºC barium titanat telah terbentuk dan temperatur optimum pada 900ºC. Seiring dengan peningkatan suhu kalsinasi, kristalinitas barium titanat juga meningkat. Hasil SEM menunjukkan serbuk barium titanat hasil sintesis telah berukuran nano. Dengan menurunkan konsentrasi prekursor menjadi 0,07 M, didapatkan serbuk barium titanat yang lebih kecil bila dibandingkan dengan serbuk yang disintesis menggunakan konsentrasi prekursor 0,1 M.Kata kunci : barium titanat, nano partikel, pulp Oryza sativa, metode proses prekursor

Oryza sativa PULP AS A TEMPLATE IN α-ALUMINA NANOCRYSTALLINE SYNTHESIS BY PRECURSOR CALCINING PROCESS Rifki Septawendar; Bambang Sunendar Purwasasmita; Suhanda ,; Leanddas Nurdiwijayanto; Taufan Hidayat
JURNAL SELULOSA Vol 1, No 01 (2011): JURNAL SELULOSA
Publisher : Center for Pulp and Paper

Synthesis and characterization of α-alumina nano powder with Oryza sativa pulp as template by precursor calcining process have been successfully conducted. The aim of this experiment is to study the potential of Oryza sativa pulp as a template of precursor calcining process method that isrelatively cheaper than that of sol gel method in α-alumina synthesis. Weight ratio between precursor and Oryza sativa pulp was 1 : 2. The effect of calcination temperature on α-alumina synthesis in this research is set by variation of calcination temperature at 900°C, 1000°C, and 1100°C. In this research, X-Ray Diffraction (XRD) analysis is used to investigate the transformation of crystal phase, structure and size of the crystal formed by the calcinations temperature. Scanning Electron Microscope (SEM)characterization is used to identify morphology of α-Al2O3 powder. Based on XRD characterization result, synthesized alumina sample forms α-Al2O3 and γ-Al2O3 crystal phases. The formed crystallite size is in nanometer dimension for α-Al2O3 which biggest crystallite size is 46.6 nm. According to SEM characterization result, it is shown that α-Al2O3 formed rhombohedral or bar shape and planar. The particle size will increase along with the elevation of calcination temperature.Key words : nano powder, α-alumina, precursor calcining process, oryza sativa pulp ABSTRAKSintesis dan karakterisasi nanopowder α-alumina dengan menggunakan pulp merang sebagai template melalui proses kalsinasi prekursor telah berhasil dilakukan. Penelitian ini bertujuan untuk mempelajari potensi pulp merang sebagai template dari precursor calcination process yang merupakan metoda relatif lebih murah dibandingkan metode sol gel dalam mensintesis α-alumina. Perbandingan berat antara prekursor dan pulp adalah 1:2. Pengaruh temperatur kalsinasi terhadap pembentukan α-alumina ditetapkan dengan variasi temperatur kalsinasi pada 900°C, 1000°C, dan 1100°C. Analisis diffraksi Sinar-X (XRD) digunakan untuk mengetahui perubahan fasa kristal, struktur, dan ukuran kristal yangterbentuk pada suhu kalsinasi tersebut. Karakterisasi SEM dilaksanakan untuk mengetahui morfologi dari serbuk α-Al2O3. Berdasarkan karakterisasi XRD, sampel alumina yang disintesis membentuk fasa α-Al2O3 dan γ-Al 2O3. Ukuran kristal yang terbentuk berskala nanometer, yaitu untuk α-Al2O3 ukuran kristal terbesar adalah 46,6 nm. Hasil karakterisasi SEM, terlihat bahwa α-Al2O3 membentuk struktur trigonal atau bentuk batang dan planar, ukuran partikel akan semakin membesar dengan meningkatnyatemperatur kalsinasi.Kata kunci : nano powder, α-alumina, proses kalsinasi prekursor, pulp merang.

The Effect of Aging Time on Biosynthesis of Zirconia Nanoparticles by Nanocellulose Templates Ratih Resti Astari; Didit Nur Rahman; Rifki Septawendar; Bambang Sunendar Purwasasmita
Jurnal Keramik dan Gelas Indonesia Vol 30, No 2 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i2.7409

In this study, the biosynthesis of ZrO2 nanomaterials was carried out using nano cellulose template from the biomass of oil palm empty fruit bunches (Elaeis guineensis). The purpose of this study was to determine the effect of nanocellulose from oil palm empty fruit bunches as a template and aging time in the formation of ZrO2 nanoparticles. The method in this research for synthesis of ZrO2 nanoparticles is the template-precursor method. The biosynthesis of ZrO2 nanoparticles calcined at 600 °C produced a metastable tetragonal phase with a nanorod-like morphology with diameter <100 nm, length <200 nm and agglomeration of nanoparticles with an average particle size of 13 nm - 17 nm.

Zirkonia untuk Aplikasi Material Restorasi Gigi Lia Asri; Rifki Septawendar; 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.v25i2.2667

Dalam paparan ini akan diulas perkembangan zirkonia sebagai material restorasi gigi beserta prospeknya untuk masa depan.

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

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

Co-Authors AA Sudharmawan, AA Abdul Halim Daulay Ahmad Nuruddin Ahmad Nuruddin Ahmad Nuruddin, Ahmad Aminuddin Debataraja Andrie Harmaji Andrie Harmaji Andrie Harmaji Angela Evelyna Angela Evelyna Angela Evelyna Angela Evelyna Angela Evelyna Angga Hudaya Anggreani, Triannisa Julia Dian Arie Wibowo Asri, Lia Asri, Lia Amelia Tresna Wulan Aulia Nur Ariswari Bambang Pontjo Priosoeryanto Bethy Suryawathy Hernowo Bharata Dewanto Brian Yuliarto Catur Aditya Ramadhany Chriswan Sungkono Cindy Chakornnipit Fadly Claudia Claudia Dahlia Sutanto Denny Nurdin Dian Noviyanti Agus Imam Dicky Juniata Dwi Suprana Didit Nur Rahman Diyah, Nazuwatussya’ Dwifulqi, Hernindya Eka Mulya Alamsyah Ekawati, Estiyanti Elsy Rahimi Chaldun Eneng Maryani Enggar Dwi Kusuma Eva Febrina Evelyna, Angela Evi Oktavia Fanni Kusuma Djati Frank Edwin Frank Edwin - Frank Edwin, Frank Gantini Subrata, Gantini Gema Gempita Gina Mayang Lestari Haimir, Alexander Syahlendra Hakim, Muhammad Lukman Nur Hakim, Muhammad Lukman Nur Hangga Guna Dharma Hapsari Milla Haris Budi Widodo Haris, Luqman Harmaji, Andrie Hasran, Muhammad Aditya Ramadhan Hendra Hermawan Heri Setiawan Hermawan, Hendra Hernawan . Hernawan ., Hernawan Irwan Taufik Hermawan Iswandi Imran Ivindra Pane Khairani, Raisa Kiky Viviani Kosterman Usri Leanddas Nurdiwijayanto Leanddas Nurdiwijayanto Leanddas NurdiWijayanto, Leanddas Lia A.T.W. Asri Lia Asri Lia Asri Lia Asri Lia Asri Luqman Haris Martinus Simatupang Maryani, Eneng Maya Komalasari Maya Komalasari Maya Komalasari Maya Komalasari, Maya Mery Agustina Mery Agustina, Mery Mieke Hemiawati Satari Mirantini Aprilisna Muhamad Nasir Muhammad Ilham Bayquni Muhammad Ilham Bayquni Nalaria Prakusya Niki Prastomo - Nina Djustiana Nugraha Nugraha Nugraha, Ashari Budi Nuruddin, Ahmad Oqy Diadara Putri Partogi H. Simatupang, Partogi H. Raisa Khairani Rakhmawati, Widya Ramdan, Raden Dadan Ramos Samuel Gultom Ratih Resti Astari Ratuannisa, Tyar Riesca Ayu Kusuma Wardhani Rifki Septawendar Rifki Septawendar Rifki Septawendar Rifki Septawendar Riyadi, Wisnu Rizka Amalina Robeth Viktoria Manurung Roland P.H. - Rosida Manurung, Rosida Rudy Octavius Sihombing Ryana Budi Purnama Septawendar, Rifki Setiawan, Heri Siagian, Rivita Subrata Gantini Suhanda , Suhanda . Suhanda ., Suhanda Susanti Nurfadhila Susanto Sigit Rahardi Susanto Sigit Rahardi Susanto Sigit Rahardi Sutrisno Sutrisno Suyatman Suyatman Tansza Setiana Putri Tati Suryati Syamsudin Taufan Hidayat Teuku Fawzul Akbar Teuku Fawzul Akbardan Triannisa Julia Dian Anggreani Weko Abhinimpuno - Yanwar Faza Yanwar Faza Yulia, Elfi Zulia Hasratiningsih Zulia Hasratiningsih, Zulia

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