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All Journal Jurnal Sains dan Teknologi Jurnal Sains Materi Indonesia Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Untirta Civic Education Journal Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Jurnal Pengabdian Magister Pendidikan IPA Jurnal Abdi Ilmu Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya GANDRUNG: Jurnal Pengabdian Kepada Masyarakat Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences International Journal Of Science, Technology & Management (IJSTM) Journal of Bioprocess Chemical and Environmental Engineering Science Abdimas Awang Long: Jurnal Pengabdian dan Pemberdayaan Masyarakat Journal of Social Empowerment Gemilang: Jurnal Manajemen dan Akuntansi Optimal: Jurnal Ekonomi dan Manajemen Smart Techno (Smart Technology, Informatic and Technopreneurship) Biner : Jurnal Ilmu Komputer, Teknik dan Multimedia AMMA : Jurnal Pengabdian Masyarakat International Journal of Economic Research and Financial Accounting Anggaran: Jurnal Publikasi Ekonomi dan Akuntansi Journal of Business Integration Competitive Jurnal Mahkota Bisnis Proceeding of The International Conference on Social Sciences and Humanities Innovation Proceeding of The International Conference on Management, Entrepreneurship, and Business
Ahmad Fadli
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Sintesis Komposit Fe3O4/Hidroksiapatit Menggunakan Metode Presipitasi Dengan Variasi Rasio Ca/P Dan Kecepatan Pengadukan Adha Widoni; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Fe3O4/Hydroxyapatite composite can be applied in the biomedical field especially for drug delivery systems. The purpose of this research was to determine the effect of Ca/P ratio and stirring rate for the composite magnetite/hydroxyapatite characteristic. Synthesis of Fe3O4/Hydroxyapatite composites using the precipitation method. Variation of Ca/P ratio 0.67; 1.67; 2.67 and stirring rate of 400 rpm, 600 rpm, 800 rpm. 20.35 mmol (NH4)2HPO4 solution with 150 ml was added to mixed the magnetite suspension and 34 mmol Ca(NO3)2.4H2O solution. NH4OH was added to the solution until pH 11 and then, the suspension was aged for one day. The magnetic suspension was washed with distillate water until pH neutral. The precipitate was dried and sintered at temperature 400˚C until composite powder obtained. Composite powder was characterized by X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Increasing of Ca/P ratio from 0.67 to 1.67 increased the crystal size and crystallinity of the composite, then decreased the size of the crystal and crystallinity at the Ca/P ratio 2.67. Crystallinity is obtained at 75.47% - 81.77%. While the effect of stirring rate from 400 rpm to 600 rpm increased the crystal size from 20.75 nm to 25.23 nm, Then, decreased at stirring rate of 800 rpm by 21.68 nm. Fe3O4/Hydroxyapatite composite were superparamagnetic with saturation magnetization (Ms) 11.97 emu/gr. Keywords: Drug Delivery, Hydroxyapatite, Magnetite, Magnetic Properties
Model Shrinking Core Pada Isolasi Kitosan Dari Limbah Ebi Rani Handayani; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitosan is derived from chitin compound used in the biomedical field. Chitosan can be synthesized from ebi waste using chemical methods through the deproteination, demineralization and the deacetylation processes. The aims of this study are to determine the effect of NaOH concentration on the degree of deacetylation chitosan synthesis and to determine the model that can describe the kinetics reaction via Shrinking Core Model (SCM) approach. The procedure of research was started by ebi waste size reduction. Ebi powder was reacted with NaOH 3.5% (deproteination), ratio 1:10 (w/v) for 2 hours stirring by 150 rpm. The deproteination product was reacted with HCl 1 N (demineralization), ratio 1:15 (w/v) for 1 hour stirring by 150 rpm. Then the product was reacted using NaOH 40%, 50%, and 60% (deacetylation), ratio 1:20 (w/v) at a temperature of 120oC with stirring by 150 rpm for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and it dried. Deacetylation degree of chitosan was analyzed using acid-base titration method. The results showed that the higher the concentration, the higher the degree of deacetylation of the chitosan will be namely 72.63% to 79.32% at a temperature of 120oC. The best reaction kinetics model to describe the occur in the synthesize of chitosan was a model 2, that was a layer (chitosan) to control with the equation as:Model 2 is the best kinetic’s model with shrinking reacted core model on synthesize of citosan and ebi waste.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinkingcore model.
Studi Kinetika Reaksi Pada Proses Deasetilasi Kitin Dari Limbah Industri Ebi Jenial S; Ahmad Fadli; Yelmida Aziz
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Chitosan is used in a variety of industrial applications, such as purification agents, flocculation agents, anti-microbial agents, biological adhesives, anti-tumor agents and the cosmetic industry. This study studied deacetylation reaction kinetics and the effect of particle size difference on chitosan formation of chitin using raw materials of ebi industrial waste. Chitosan was obtained by deproteination, demineralization and deacetylation using 50% NaOH with a ratio of 1:20 (w / v) at a temperature of 80 ° C. Samples were analyzed using FTIR sprestroscopy and acid-base titration. The results showed the deacetylation degree at minute 120 for chitin diameter 0.25, 0.177, 0.152 mm were 51.51, 64.39, and 78.87%, respectively. The reaction mechanism is determined by model matching using the SSE value of the model against the value of the data obtained. From the result of approach done using the Shrinking Unreacted Core model it is known that the reaction is influenced by diffusivity. This corresponds to the value of the obtained diffusivity for each sample ranging from 0.25, 0.177 and 0.152 mm diameters respectively of 1.841. 10-18, 2.657. 10-18, and 3.085 .10-18 m2/s.Keywords : Deacetylation, reaction kinetics, chitosan, ebi’s waste, shrinking unreacted core model
Pengaruh Penambahan Wheat Particles Dan Waktu Sintering Pada Fabrikasi Tricalcium Phospate Dengan Metode Starch Consolidation Rathesa Najela; Ahmad Fadli; Zultiniar Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Tricalcium phosphate (TCP) is a porous material that can be used as a bone substitute. One method of making the porous TCP is starch consolidation using wheat particles. This researchaims to determine the effect of composition of wheat particles and sintering time on physical, chemical and mechanical TCP porous prepared by starch consolidation method. Wheat particles with variation of 4 g, 6 g and 8 g mixed with TCP suspension and then stirred for 3 hours. Slurry was dried in an oven at 80oC for 24 hours and 120oC for 8 hours. The dried green bodies inserted into the furnace where the combustion process occured at a temperature of 600oC for 1hour, followed by sintering at a temperature of 1100oC with variation of 1 hour, 2 hours and 3 hours. The results show that more addition of starch cause high shrinkage and porosity with low density and compressive strength. While for long sintering time lead to decline porosity with high shrinkage, density, and compressive strength. Produced sintered body in the addition of starch 4 g with sintering time of 3 hours showed 48.32 % shrinkage with 45.56 % porosity and 5.002 MPa compressive strength.Keyword : compressive strength, porosity, tricalcium phosphate, wheat particles
Pembuatan Batu Bata Dengan Penambahan Tanah Terkontaminasi Minyak Annisa Aprilya Putri; Ahmad Fadli; Cory Dian Alfarisi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The petroleum industry is one of the largest oil and gas companies in Indonesia. From the exploration and production of petroleum, it turns out that the petroleum industry also produces petroleum waste which can pollute the soil. For waste handling, it is necessary to have efficient and environmentally friendly petroleum processing, in the form of brick making. The purpose of this study was to study the effect of adding a mixture of oil and clay contaminated soil and the effect of drying time on the bricks obtained from the tests carried out, namely testing compressive strength, density, water absorption, and porosity. The procedure was started with weighing all materials with variations of 2 kg, 10 kg and 14 kg oil-contaminated soil (TTM), mixing oil and cement, and then stirring water until it was homogeneous. the next step has been the processed of molding the stones and then drying them for 3, 5 and 7 days and finally the burning process has been carried out. Variations were studied by differentiating the percentage composition of the soil mixture contaminated with oil and clay used. The test results from the compressive strength, density, absorption and porosity test show that the best sample for consumers is the sample with 2 Kg oil-contaminated soil on drying for 7 days while the best sample in terms of utilization is the sample with the composition of 14 Kg oil-contaminated soil.Keywords: brick, compressive strength, porosity, oil contaminated soil
Pengaruh Waktu Ageing Dan Kecepatan Pengadukan Pada Sintesis Hidroksiapatit Dari Cangkang Telur Dengan Metode Presipitasi Rio Andika; Ahmad Fadli; Irdoni HS
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Hydroxyapatite (HAp) is one of the calcium phosphate compounds are used as biomaterials because of the ceramic material which has a stable properties. The purpose of this study is to study the effect of ageing time and stirring rate of the HAp obtained. HAp from eggshells has been successfully synthesis using precipitation method with variation of ageing time and stirring rate. Eggshells were calcined at 1000 oC for 5 hours to produce calcium oxide (CaO). CaO was dissolved into nitric acid (HNO3) to obtain (Ca(NO3)2), and then mixed slowly into a diamonium hydrogen phosphate solution which was already dissolved into aquabidest. After mixing process is complete, the solution was settling with the variation of ageing time 0 hour, 12 hours, 36 hours and 48 hours and the best condition continued in the second variation of the stirring rate 200 rpm, 250 rpm, 350 rpm and 400 rpm. HAp produced at the ageing time 12 hours is the optimum condition. Bonds of PO43- and OH- shown HAp compounds, also it contained tricalcium phosphate (TCP) and calcium hydroxide (Ca(OH)2) compounds. Morphology of HAp particles had a granular form with a increasing particle size of HAp with the ageing time in the range 60-48 nm, whereas the faster rate of stirring had been produced the particle in the range 47-44 nm.Keywords: ageing time; eggshells, hydroxyapatite; mixing; precipitation
Pengaruh Parameter Rasio Liquid-Solid, Suhu Dan Lama Perawatan Terhadap Kuat Tekan Paving Blok Geopolimer Thomson Simanjuntak; Aman Aman; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Fly ash as a substitute for cement shows potential waste utilization. The objective of the research is to find the optimum parameter to produce geopolymer. Use of fly ash type F from Paiton Probolingo power plant, fine aggregate of sand,NaOH 14M and Na2SiO3 solution. The liquid activator/solid (fly ash) ratio varies 0.3; 0.5 and 0.7 and treatment temperature variations from room temperature (30), 60, 80 and 100 oC and curing time of 3, 7, 14 and 28 days. The modulus activator ratio of Na2SiO3 / NaOH is 2 and the ratio of fly ash to aggregate is 1: 3. Compressive strength obtained 314.20 kg/cm2 at optimum ratio of liquid/solid 0.5 and curing at 80 oC and 28 days.Keywords: Fly ash; Geopolymer; Paving block; Compressive Strength; Modulus.
Pengaruh Tegangan Listrik Dan Waktu Pelapisan Hidroksiapatit Pada Logam 316L Dengan Metode Elektroforesis Deposisi (EPD) Mayang Sari; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Stainless steel 316L is a metal which used to bone plate, this metal has low biocompatibility in a human body. The stainless steel 316L need to be coated by HA for increased their biocompatibility. The purpose of this research is to learn the effect of applied voltage and deposition time, then characterize HA coated 316L stainless steel. Stainless steel 316L put into alcohol and water solution for 1 hour. The HA powder was deposited by electrophoretic deposition (EPD) using carbon as anode and stainless steel 316L as cathode. It was observed from SEM analysis that HA deposited on stainless steel increased with higher voltage, thickness of HA layer on stainless steel was 30 μm, 45 μm and 55 μm for deposition 17 minutes and applied voltage 40, 60 and 80 volt. Thickness of HA layer on substrate increased, as the time deposition increased with result 30 μm dan 55 μm at deposition 80 volt and deposition time 2 and 17 minutes. HA coatings at applied voltage 80 volt and deposition time 17 minutes was obtained suitable for bone plate.Keywords : Coating, Electrophoretic Deposition, Hydroxyapatite, Stainless Steel 316L
Pengaruh ph Dan Waktu Reaksi Pada Sintesis Hidroksiapatit Dari Tulang Sapi Dengan Metode Presipitasi M Satria Haruda; Ahmad Fadli; Silvia Reni Yenti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Hydroxyapatite is a mineral compound with chemical formula CA10 (PO4)6(OH)2 which can be used as implants in the human body. Hydroxyapatite can be synthesized from bovine bones using precipitation method. The aim of this study was to know the effect of pH and time of reaction to the characterization of hydroxyapatite made from using bovine bone. Bovine bones calcined at 1000 ℃ to produce calcium oxide (CaO). Then CaO is dissolved into distilled water and slowly mixed with phosphoric acid (H3PO4) and then set the pH 5, 7, 9, 11, and time of reaction 20, 40, 60, 80, 100, and 120 minutes. Then allowed to stand 24 hours and the precipitate is filtered. The results calcined sieve then characterized by XRD, FTIR and SEM. The effect of pH and time of reaction in the synthesis of hydroxyapatite seen in the XRD analysis showed the higher peaks than the other at the same peaks and the FTIR analysis looks at the increasingly sharp steepness wavelength at PO43- functional groups and OH- when the pH is higher. Based on the results , the hydroxyapatite at pH 11 has a purity of 99.7 % and crystanility of 98.33 % , while the pH 5 has a purity of 97.5 % and crystanility of96.00 %. Time of reaction at 100 minutes showed a purity of 99.8 % and crystanility of 92.82 % and purity of 92.9 % and crystanility of 84.99 % for 20 minutes. .Keywords: hydroxyapatite, pH, precipitation, time of reaction
Pembuatan Prototip Dye Sensitized Solar Cell (DSSC) Berbasis Zat Warna Buah Senduduk (Melastoma Malabathricum L.) : Pengaruh Suhu Sintering TiO2 Dan Konsentrasi Elektrolit Wilda Zakiah; Amun Amri; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
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Increasing demand of energy consumption enforces the development of alternative energy source to solve the world energy crisis. Dye Sensitized Solar Cell (DSCC) is a promising alternative for solar cell application of future generation which is based in semiconductors that utilizes photoelectrochemical phenomenon as basic principle to generate electricity. This research tries to make DSSC prototype with dye from melastome fruit (Melastoma Melabathricum L.). The examined variables are TiO2 sintering temperature at 300oC, 350oC, 400oC, and electrolyte concentration 0.025M, 0.05M and 0.075M of iodine. On the first step, the dye was made by diluting 20 gr of melastome fruit in aquadest, methanol, and acetic acid. Next, the coating of TiO2 by solving TiO2 powder in ethanol and deposited on spin coater and sintered by using furnace. Then the making of carbon electrode, making of electrolyte, and finally characterization of DSSC. UV-Vis spectroscopy examination result showed that melastome fruit contains anthocyanin that was proved from absorbance on wavelength of 515 nm. DSSC voltage examination showed that the higher TiO2 sintering temperature and electrolyte concentration, then the voltage generated was higher as well. The highest voltage was showed on sample with iodine electrolyte concentration of 0,075 M which is 2,385 Volt/cm2. Morphollogy test showed that TiO2 coating has porous structure with equal particle dispersion on every increment of TiO2 sintering temperature. XRD examination showed that the coating is in anatase phase and adhesion test showed that DSSC with highest voltage has adhesivity of 3B (Good).Key Word : dye sensitized solar cell (dssc), dye, electrolyte, tio2
Co-Authors Abdul Kohar Abdul Malik K.A Abdul Rasyid Achmad Noerkhaerin Putra Adam Samsudin Noor Ade Pratama Adela Shofia Addabsi Adha Widoni Adi Maulana Putra Adi Mulyadi Putra Adrianto Ahmad Aep Saefullah Afrila Afrila Agung Prabowo Agung Prabowo Agus Susanto Agya Mutia Alifta Ahmad Aguswin Ahmad Fadhil Nugroho Ahmad Riadi S Hasibuan Ahmad Zaki Akhmad Akhmad Akhmad Akromusyuhada Alfarisi, Cory Dian Allailus Syah Safara Aman aman Amun Amri Andi Risfan Rizaldi Annisa Aprilya Putri Annisa Rahmat Ap’aluddin Ari Aditia Sukma Sukma Arifin Setiabudi Arisky Rahmatulloh Arosyidin Arosyidin Aulia Permatasari Bahruddin Benny Ahmadi Bima Wandika Putra Cahyo Dwi Rachmadi Calvin Prasetyo Chaniago, Sabaruddin Charismayani Charismayani Chorina Ika Ristanti Damayanti, Elok Debora Tambunan Deni Astika Derry Hanriansyah Pratama Deska Deska Devia Febrina Dewi Indah Pratiwi Dewi Rafiah Pakpahan Dhamala Shobita Chandra Dhanang Hayuningwang Dingot Hamonangan Sitanggang Dion Julio Iskandar Dovy Reyandi Drastinawati Drastinawati Dwi Yerlis Rahmi Edy Saputra Effendi, Ihsan Elvira Sitna Hajar Emizatul Aini Ervina Ervina Esty Octiana Sari Fadhil Mubarak Fajril Akbar Fernando Susilo Fisy Amalia Gading Bagus Mahardika Gede Indra Ludy Wirata Gunawan Atmaja Halim Wijaya Heni Sugesti Herry Novriansyah I Wayan Sudiarta Idral Amri Ika Agustina Ika Karina Ika Puspa Satriany Ilham Habib Indah Fitriani Indra Yasri Indrawan Indrawan Ines Indriyani Irdoni HS Irdoni Irdoni Irwan Ahussalim Jabosar Ronggur Hamonangan Panjaitan Jannatin Ardhuha Jayaun Jayaun Jenial S Jenni Kristina Br Panjaitan Jessica Andre Julharmito Julharmito Junaidi Junaidi Kania Farida Komalasari Komalasari LALU RUDYAT TELLY SAVALAS Lathifah Cahyani P3 Lia Yuningsih Lilis Suriani Luci Octaria M Satria Haruda M. Ferdinansyah M. Zamroni Mahendra Aswit Sandra Barata Manda Dwipayani Bhastary Marlinda Martin Maya Andiriani MAYANG SARI Mega Safana Mega Sanjaya Melda Helena S Miftah Anugrah Mochamad Reizal Ath Thariq Moh. Tahang Mona Lisa Muchlis Ade Putra Muh Irwan Muhamad Hendri Diarta Muhamamad Rizky Zuriadi Muhammad Hamdani Mustika Canra MUTIARANI MUTIARANI Nanda Nabila Maharani Nasib Nisa Mulya Nissa Aqhilla Novika Sri Wardani Novirsari, Emma Nuraina Siregar Nurjamilah Nursyaniati Nursyaniati Nurul Afifah Ongky Alexander Opik Hidayat Abdul Latif Padil Pancasila Putri Peter Peter Puji Rahayu Purnama Sari Putri Arini Putri Julia Maemum Putri Rahmadani Rahmad Rasyidin Ramadani Pardian Ramadhana Eka Rani Handayani Rathesa Najela Ratih Amelia Rawdatul Fadila Reny Novianti Ridho Hafizh Maulana Ridho Wijaya Riki Rahmadhan Riko Ervil Rio Andika Rizky Gimnastiar Robin Roni Juliansyah Rozanna Sri Irianty Rusydy ' Sai Vinodhini Samsoni Samsoni Septiana Veronika S Septianing Tyas K Silvia Reni Renti Silvia Reni Yenti Silvia Reni Yenty Sintia Siska Priscillia Aledya Siti Chotijah Siti Nurkhaliza Sri Murda Niati Subkhan Maulana Sunarno Sunarno Syarifuddin Oko Syelvia Renni Yenti Thomson Simanjuntak Thufail Mujaddid Al-Qoyim Tina Linda Toni Ardi Ulfa Dwiyanti Ulfah Naida Marbun Wan Elsa Novtari Adiani Wasty Rusjaya Wilda Zakiah Wiriyan Jordy Wyda N Saragi Yelmida Azis Yesi Afriani Yopy Ratna Dewanti Yuli S Yunus Olivia Novanto Zubair Arza Zuchra Helwani Zulkarnain Lubis Zultiniar Zultiniar