Garuda - Garba Rujukan Digital

Alizar Ulianas

Unknown Affiliation

Author-ID : 5345699

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology Social Sciences

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Sintesis dan Karakterisasi Magnetik Nanopartikel NiFe2O4 Menggunakan Ekstrak Kulit Buah Naga (Hylocereus Polyrhizus) Srifu Rahmawita; Alizar Ulianas
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 1 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

In the past few years, intensive research has been carried out on magnetic nanoparticles, one of which is ferrite nanoparticles. These ferrite nanoparticles have the general formula MFe2O4 (where M = Mn, Co, Zn, Cu, and Ni). This nanoparticle is interesting because it has magnetic properties and is more efficient than other ferrite nanoparticles in its application. This research was conducted to synthesize NiFe2O4 nanoparticles with a hydrothermal method based on green chemistry by utilizing dragon fruit peel extract as a stabilizing agent. NiFe2O4 nanoparticles were characterized with a Gauss meter to measure their magnetic strength, FTIR, XRD and SEM were used to determine functional groups, particle size, and surface morphology of the nanoparticles. The greatest magnetic strength of magnetic nanoparticles is 0.19 mT with a composition of 25 mL dragon fruit peel extract, 2 mol Fe(NO3)3.9H2O and 1 mol Ni(NO3)2.6H2O. The FTIR test showed the presence of an OH group absorption peak at a wavelength of 3359.93 cm-1, the C = C group appeared at a wavelength of 1631.03 cm-1 and the C-O group at a wavelength of 1360.20 cm-1, which indicates that NiFe2O4 nanoparticles are protected by organic compounds (flavonoids ). Characterization of magnetic nanoparticles using XRD showed the shape of the nanoparticles produced in the form of cubic spinels with a particle size of 71.52 nm, while SEM characterization showed surface shapes such as irregular fine grains.

Sintesis Nanopartikel Magnetik Besi Oksida (Fe3O4) Metode Green Chemistry Dengan Ekstrak Daun Sirih Merah (Piper Crocatum) Rafiqa Khaira; Alizar Ulianas; Minda Azhar; Mawardi Anwar
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Magnetic nanoparticles have become an interesting topic in recent years, as magnetic nanoparticles have a greater degree of magnetism, high saturation magnetization, and ease of modification and handling. One of them is the Fe3O4 magnetic nanoparticles which are used in various fields, such as in the biomedical sector which acts as antibacterial, hyperthermia, anticancer, etc. This study aims to synthesize magnetic nanoparticles of iron oxide Fe3O4 using phenolic compounds contained in red betel leaf extract as a styling agent with a co-precipitation method based on green chemistry and to characterize them. The nanoparticles formed were measured for their magnetic force with a gaussmeter and characterized by functional groups, particle size and particle surface morphology using FTIR, XRD and SEM. The data obtained show that the optimal composition for the formation of Fe3O4 nanoparticles is to compare FeCl2: FeCl3 (0.01 mol: 0.02 mol) with a volume of 5 mL of red betel leaf extract which produces a force magnetic 0.16 mT. The characterization by FTIR shows the aromatic groups O-H, C = O carboxylate and C-H which indicate the presence of organic compounds, namely phenolic (gallic acid) which functions as a protective agent (styling agent) of Fe3O4. The XRD test obtained information on the average size of the formed nanoparticles based on the FWHM value (full width at half maximum) using Scherer's equation, which is 26.66 nm. Meanwhile, SEM data shows that the shape or morphology of the Fe3O4 magnetic nanoparticles is needle-like.Keywords — Nanoparticles, iron oxide Fe3O4, green chemistry, red betel leaf extract (Piper Crocatum)

Analisis Miskonsepsi Peserta Didik pada Materi Hidrolisis Garam Menggunakan Instrumen Three-Tier Diagnostic Test di SMAN 2 Solok Yami Suca; Alizar Ulianas
Entalpi Pendidikan Kimia Vol 2 No 3 (2021)
Publisher : Universitas Negeri Padang

ABSTRACTMisconception is the discrepancy of a concept with a scientific understanding that is agreed upon by experts. The aim of this study was to identify the misconceptions experienced by students in the salt hydrolysis material. The research data was obtained through a three-tier diagnostic test consisting of 21 questions. This research involved a sample of 50 students of class XI IPA 4 and XI IPA 5 of SMAN 2 Solok. The method used in this research is descriptive. The results of the research show that in general, students experience misconceptions where the average of these misconceptions is 35%. Students experience misconceptions about the concept of understanding salt hydrolysis by 58%, the nature of the hydrolyzed salt by 29%, the types of salt hydrolysis by 34%, determining the pH of salt hydrolysis by 28%, and calculating the pH of salt hydrolysis by 25%.Keywords: Salt Hydrolysis, Misconception, Three-TierABSTRAKMiskonsepsi merupakan ketidaksesuaian suatu konsep dengan pengertian ilmiah yang disetujui oleh para ahli. Tujuan penelitian ini yaitu mengidentifikasi miskonsepsi yang dialami peserta didik pada materi hidrolisis garam. Data penelitian diperoleh melalui tes diagnostik three tier yang terdiri atas 21 butir soal. Peneliitan ini melibatkan sampel sebanyak 50 orang peserta didik kelas XI IPA 4 dan XI IPA 5 SMAN 2 Solok. Penelitian ini menggunakan metode deskriptif. Hasil penelitian menggambarkan bahwa secara umum peserta didik mengalami miskonsepsi dimana rata–rata miskonsepsi tersebut sebesar 35%. Persentase miskonsepsi peserta didik berdasarkan konsep adalah; konsep pengertian hidrolisis garam sebesar 58%, sifat garam yang terhidrolisis sebesar 29%, jenis–jenis hidrolisis garam sebesar 34%, menentukan pH hidrolisis garam sebesar 28%, dan menghitung pH hidrolisis garam sebesar 25%. Hasil penelitian menunjukkan bahwa secara umum dalam materi hidrolisis garam peserta didik mengalami miskonsepsi.Kata Kunci: Hidrolisis garam, Miskonsepsi, Three-Tier

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