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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Sains & Matematika
Diah Hari Kusumawati
Universitas Negeri Surabaya
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Materials Science & Nanotechnology Mathematics Physics

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PEMURNIAN BATU KAPUR BERBASIS NANO KALSIT DENGAN METODE KOPRESIPITASI Putri, Nugrahani Primary; Kusumawati, Diah Hari
Sains & Matematika Vol 5, No 1 (2016): Oktober, Sains & Matematika
Publisher : Sains & Matematika

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Abstract

Sintesis nano kalsit yang terbuat dari batu kapur menggunakan metode kopresipitasi berhasil diimplementasikan. Sintesis dilakukan dengan memvariasikan tekanan gas CO2 dan waktu pengendapan untuk mendapatkan kalsit dengan kemurnian tinggi dan ukuran partikel kecil. Data difraksi dikumpulkan menggunakan XRD, yang kemudian dianalisis menggunakan perangkat lunak Match dan Rietica untuk mendapatkan informasi tentang kecocokan, tingkat kemurnian, kepadatan, dan ukuran partikel. Dari analisis menggunakan Match, ditemukan bahwa batu kapur sebagai bahan dasar memiliki fase CaCO3 dan Ca(OH)2, sedangkan sampel yang disintesis dengan metode kopresipitasi memiliki fase kalsit. Hasil analisis berdasarkan Rietica menunjukkan bahwa hasil terbaik adalah sampel yang disintesis dengan variasi tekanan gas CO2 37,5 kgf/cm3 dan waktu pengendapan selama 36 jam.Synthesis nano calcite made of limestone using coprecipitation method has been succesfully implemented. Synthesis is held by varying the CO2 gas pressure and precipitation time in order to obtain calcite with high purity and small particle size. Diffraction data were collected using a XRD, which then analyzed using software Match and Rietica to obtain information about fitness, degree of purity, density and particle size. From analysis using Match, it was found that limestone as base material has CaCO3 and Ca(OH)2 phases, while samples which synthesized by coprecipitation method has calcite phase. Analysis result by Rietica shows that the best result is sample which synthesized with CO2 gas pressure variation of 37.5 kgf/cm3 and the settling time for 36 hours.
VARIASI MOLARITAS H2SO4 PADA POLIANILIN/H2SO4 Chomari, Moch. Nur; Kusumawati, Diah Hari
Sains & Matematika Vol 1, No 1 (2012): Oktober, Sains & Matematika
Publisher : Sains & Matematika

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Synthetis of polyaniline has carried out using oxidation polymerization of aniline monomer to oxidant ammonium peroxydisulfat (NH)4S2O8 and H2SO4 as a source of proton doped. Variations in the molarity of H2SO4 conducted to determine of optimum polyaniline on electrical conductivity. Polyaniline samples were characterized by FTIR to determine the cluster function and the four-point probe method to determine the electrical conductivity. FTIR results showed that the samples were synthesized is polyaniline. Electrical conductivity test by used four point probe method showed higher acid molarity higher the electrical conductivity to the optimum. After reaching the optimum point, the electrical conductivity of polyaniline decreases followed by the molarity increases. Polyaniline has the most optimum conductivity of 1.833 S/cm when synthesized with 0.12 M H2SO4. 
KARAKTERISTIK TRANSMITANSI DAN ABSORBANSI KOMPOSIT EPOKSI/TIO2 SEBAGAI BAHAN ANTI ULTRAVIOLET Kusumawati, Diah Hari; Rachmawati, Dian Ayu
Sains & Matematika Vol 5, No 2 (2017): April, Sains & Matematika
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Nanopartikel TiO2 (titanium dioksida) telah banyak diteliti dan digunakan dalam aplikasi kehidupan sehari-hari, diantaranya sebagai bahan anti ultraviolet.  Karakteristik dari TiO2 selain mampu mentransmisikan Ultraviolet juga dapat mendegradasikan polutan organik menjadi air maupun karbondioksida. Namun titanium dioksida memerlukan material lain agar dapat diaplikasikan sebagai bahan anti UV, salah satunya adalah bahan perekat, dalam hal ini digunakan epoksi DGEBA.  Penelitian dilakukan dengan memvariasi titanium dioksida yang berfungsi sebagai filler pada komposit epoksi/TiO2 dan menganalisis pengaruhnya terhadap kemampuan transmitansi dan absorbansi gelombang ultraviolet.  Karakterisasi yang dilakukan adalah FTIR, UV-Vis dan pengukuran sudut kontak.  Hasil penelitian dengan variasi titanium dioksida 0,01-0,05 gram didalam epoksi diperoleh pola serapan Ti-O, Ti milik TiO2 dan O milik Epoksi DGEBA terletak pada 970,23 cm-1, transmitansi optimum sebesar 21% pada penambahan massa TiO2 sebanyak 0,03 gram. Hasil karakterisasi UV-Vis diperoleh absorbansi optimum pada 3,934, dan komposit termasuk dalam bahan hidrofilik dengan sudut kontak 30º-90º sehingga komposit epoksi/TiO2 bisa digunakan sebagai bahan anti debu (fogging) dan self cleaning.TiO2 nanoparticles (titanium dioxide) have been widely studied and used in everyday life applications, including as an anti-ultraviolet material. The characteristics of TiO2 besides being able to transmit Ultraviolet can also degrade organic pollutants into water and carbon dioxide. However, titanium dioxide requires other materials to be applied as an anti-UV material, one of which is an adhesive, in this case DGEBA epoxy is used. The study was carried out by varying titanium dioxide which functions as a filler in epoxy/TiO2 composites and analyzing its effect on the transmittance and absorbance ability of ultraviolet waves. Characterization performed was FTIR, UV-Vis and contact angle measurements. The results of research with variations of titanium dioxide 0.01-0.05 grams in the epoxy obtained the absorption pattern of Ti-O, Ti-owned TiO2 and O-owned Epoxy DGEBA located at 970.23 cm-1, the most optimum transmittance of 21% on the addition of TiO2 mass 0.03 gram. UV-Vis characterization results obtained optimum absorbance at 3,934, and composites included in hydrophilic material with a contact angle of 30º-90º so that the composite epoxy/TiO2 can be used as an anti-dust material (fogging) and self cleaning.
SIFAT MEKANIK BETON POLIMER EPOKSI DENGAN PENGISI PARTIKEL NANOKALSIT-SILIKA Putri, Nugrahani Primary; Kusumawati, Diah Hari; Rohmawati, Lydia
Sains & Matematika Vol 2, No 2 (2014): April, Sains & Matematika
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Abstract

Polymer concrete environmentally friendly by utilizing the waste has been developed, one with waste mussel shells and sidoarjomud. Utilization of the waste is not optimal, for it to be used as filler in polymer concrete waste will be expected to have a highereconomic value. This research aimed to utilize the waste of cockle's shells and sidoarjo mud as filler of polymer concrete. Both waste firstsynthesized into nano particles by taking calcite and silica alone (mussel shells into nanocalsite and sidoarjo mud into nanosilica), beforebeing used as a filler. Once formed nanocalsite and nanosilica, composites with epoxy resin matrix and filler nanocalsite and nanosilicacreated by varying the percentage weight of each filler 5-10% by weight. Then the characterization was conducted in the form of tensiletest, hardness, bending and impact test. The test results showed that the resulting polymer concrete has physical properties, mechanical,thermal and microscopic good and has an optimum value at 10% filler calcite + 10% silica, which is 218.39 MPa compressive strength,tensile strength of 3.32 MPa, a strong fracture of 8.04 MPa and hardness values ranged from 16.08 to 18.3 HVN. Overall the resultshave met the standards for the characterization of polymer concrete.
KARAKTERISASI SIFAT LISTRIK DAN MAGNETIK PANI/HCL/FE3O4 AKIBAT PENAMBAHAN FE3O4 PADA KOMPOSIT PANI/HCL Purwanto, Purwanto; Kusumawati, Diah Hari
Sains & Matematika Vol 2, No 1 (2013): Oktober, Sains & Matematika
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Abstract

Fabrication PANi/HCl has been carried out by interfacial polymerization method, Fe3O4 nanoparticles by coprecipitation method and composite with compacting method. In the manufacture of composites, the addition of Fe3O4 nanoparticles aims to improve the electrical properties and characteristics of the magnetic properties of the composite PANi/HCl/Fe3O4. Characterization was conducted on the electrical conductivity measurements, characterization of XRD and VSM. Characterization results in this study could be seen that with the addition of Fe3O4 in PANi/HCl/Fe3O4 the electrical conductivity decreases significantly with increasing addition of Fe3O4. The maximum electrical conductivity of PANi/HCl at 16,667 S/cm decreased with the highest reduction at 40% Fe3O4 with a value of 21.1 × 10-4 S/cm. With the addition of Fe3O4 nanoparticles of the magnetic properties PANi/HCl in PANi/HCl/Fe3O4 composites increased significantly with increasing addition of Fe3O4 nanoparticles. The enhancement magnetic properties was shown by the increasing value of saturation magnetization (Ms) PANi/HCl in the composite PANi/HCl/Fe3O4. For the PANi/HCl with a value of Ms = 25.48 × 10-4 emu/cm3 experienced the highest increase in the addition of 40% Fe3O4, that is the value of Ms = 18.5 emu/cm3.
ORNE Learning Model to Improve Problem-Solving Skills of Physics Bachelor Candidates: An Alternative Learning in the Covid-19 Pandemic Prahani, Binar Kurnia; Ramadani, Ali Hasbi; Kusumawati, Diah Hari; Suprapto, Nadi; Madlazim, Madlazim; Jatmiko, Budi; Supardi, Zainul Arifin Imam; Mubarok, Husni; Safitri, Shabrina; Deta, Utama Alan
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v10n1.p71-80

Abstract

In this industrial revolution 4.0 era, professional science, technology, engineering, and mathematics (STEM) bachelor must have various skills. One of which is problem-solving skills. The development of problem-solving skills (PSS) is very important in higher education. Students must have PSS that must be improved to become excellent graduates, including physics bachelor candidates. Many physics bachelor candidates lack problem-solving skills. This problem is the basis for developing innovative learning models based online that, by design, can improve the problem-solving skills of physics bachelor candidates in the COVID-19 pandemic. This research aims to analyze the effectiveness ORNE learning model in improving the problem-solving skills of physics bachelor candidates as an alternative to online learning in the COVID-19 pandemic. The research design used a true-experiment with a non-equivalent control group design with 58 physics bachelor candidates. Data collected using the problem-solving skills test and then analyzed using the Paired Sample Test, Effect Size, N-gain, and Independent Sample Test. The results showed that the ORNE learning model proved effective in improving physics bachelor candidates' problem-solving skills. This research implies that the ORNE learning model can improve physics bachelor candidates' problem-solving skills as an alternative to online learning in the COVID-19 pandemic.
Pemurnian Batu Kapur Berbasis Nano Kalsit dengan Metode Kopresipitasi Putri, Nugrahani Primary; Kusumawati, Diah Hari
Sains & Matematika Vol 5, No 1 (2016): Oktober, Sains & Matematika
Publisher : Sains & Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sintesis nano kalsit yang terbuat dari batu kapur menggunakan metode kopresipitasi berhasil diimplementasikan. Sintesis dilakukan dengan memvariasikan tekanan gas CO2 dan waktu pengendapan untuk mendapatkan kalsit dengan kemurnian tinggi dan ukuran partikel kecil. Data difraksi dikumpulkan menggunakan XRD, yang kemudian dianalisis menggunakan perangkat lunak Match dan Rietica untuk mendapatkan informasi tentang kecocokan, tingkat kemurnian, kepadatan, dan ukuran partikel. Dari analisis menggunakan Match, ditemukan bahwa batu kapur sebagai bahan dasar memiliki fase CaCO3 dan Ca(OH)2, sedangkan sampel yang disintesis dengan metode kopresipitasi memiliki fase kalsit. Hasil analisis berdasarkan Rietica menunjukkan bahwa hasil terbaik adalah sampel yang disintesis dengan variasi tekanan gas CO2 37,5 kgf/cm3 dan waktu pengendapan selama 36 jam.Synthesis nano calcite made of limestone using coprecipitation method has been succesfully implemented. Synthesis is held by varying the CO2 gas pressure and precipitation time in order to obtain calcite with high purity and small particle size. Diffraction data were collected using a XRD, which then analyzed using software Match and Rietica to obtain information about fitness, degree of purity, density and particle size. From analysis using Match, it was found that limestone as base material has CaCO3 and Ca(OH)2 phases, while samples which synthesized by coprecipitation method has calcite phase. Analysis result by Rietica shows that the best result is sample which synthesized with CO2 gas pressure variation of 37.5 kgf/cm3 and the settling time for 36 hours.
Karakterisasi Sifat Listrik dan Magnetik PANI/HCl/Fe3O4 akibat Penambahan Fe3O4 pada Komposit PANI/HCl Purwanto, Purwanto; Kusumawati, Diah Hari
Sains & Matematika Vol 2, No 1 (2013): Oktober, Sains & Matematika
Publisher : Sains & Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Fabrication PANi/HCl has been carried out by interfacial polymerization method, Fe3O4 nanoparticles by coprecipitation method and composite with compacting method. In the manufacture of composites, the addition of Fe3O4 nanoparticles aims to improve the electrical properties and characteristics of the magnetic properties of the composite PANi/HCl/Fe3O4. Characterization was conducted on the electrical conductivity measurements, characterization of XRD and VSM. Characterization results in this study could be seen that with the addition of Fe3O4 in PANi/HCl/Fe3O4 the electrical conductivity decreases significantly with increasing addition of Fe3O4. The maximum electrical conductivity of PANi/HCl at 16,667 S/cm decreased with the highest reduction at 40% Fe3O4 with a value of 21.1 × 10-4 S/cm. With the addition of Fe3O4 nanoparticles of the magnetic properties PANi/HCl in PANi/HCl/Fe3O4 composites increased significantly with increasing addition of Fe3O4 nanoparticles. The enhancement magnetic properties was shown by the increasing value of saturation magnetization (Ms) PANi/HCl in the composite PANi/HCl/Fe3O4. For the PANi/HCl with a value of Ms = 25.48 × 10-4 emu/cm3 experienced the highest increase in the addition of 40% Fe3O4, that is the value of Ms = 18.5 emu/cm3.
Co-Authors Ali Hasbi Ramadani, Ali Hasbi Binar Kurnia Prahani Budi Jatmiko Chomari, Moch. Nur Husni Mubarok Lydia Rohmawati Madlazim Madlazim Nadi Suprapto Nugrahani Primary Putri Purwanto Purwanto Rachmawati, Dian Ayu Safitri, Shabrina Utama Alan Deta ZAINUL ARIFIN IMAM SUPARDI