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ORNE Learning Model to Improve Problem-Solving Skills of Physics Bachelor Candidates: An Alternative Learning in the Covid-19 Pandemic Binar Kurnia Prahani; Ali Hasbi Ramadani; Diah Hari Kusumawati; Nadi Suprapto; Madlazim Madlazim; Budi Jatmiko; Zainul Arifin Imam Supardi; Husni Mubarok; Shabrina Safitri; Utama Alan Deta
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

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.

Studi Pengaruh Arus Polimerisasi terhadap Konduktivitas Listrik Polianilin yang Disintesis dengan Metode Galvanostatik Diah Hari Kusumawati; Woro Setyarsih; Nugrahany Primary Putri
Jurnal Fisika dan Aplikasinya Vol 4, No 1 (2008)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Sintesis polianilin dapat dilakukan secara elektrokimia dengan metode galvanostatik menggunakan rangkaian elektropolimerisasi galvanostatik yang terdiri dari sumber arus, tegangan, elektroda karbon sebagai elektroda kerja dan nikel sebagai elektroda mitra. Polianilin disintesis dalam sel elektrokimia yang terdiri dari larutan HCl dan anilin. Dengan menggunakan parameter arus yang optimum diperoleh hasil polianilin dengan konduktivitas listrik yang optimum (25 Scm−1) pada sumber arus 3 mA dengan konsentrasi HCl 3 M dan konsentrasi anilin 1 M.

Development of rGO/Fe3O4 Composites as Glucose Biosensors Diah Hari Kusumawati; Rahayu Yudia Mufida
Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Vol. 5 No. 2: July 2021
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/esaintika.v5i2.493

The rGO/Fe3O4 composite is one type of composites that can be used as a biosensor material, especially glucose sensors. The main ingredients of the composite synthesis are graphite and iron sand. The synthesis process of Fe3O4 was done using the coprecipitation method, while the graphite oxidation process was accomplished using the modified Hummer's method. The composites were formed using the ex-situ wet mixing method. The formed iron sand and graphite were characterized using FTIR and XRD, and it was found that Fe3O4 was formed from the appearance of the Fe-O bond, the oxidation process of graphite was seen from the appearance of the C=O bond, and the detection of Fe peaks corresponded to the cubic crystal plane. Likewise, the composites formed were also characterized using FTIR and XRD for identification of the rGO/Fe3O4 composite formation. It was proven from the presence of Fe-O and C-O bonds and the appearance of an amorphous peak of rGO in the XRD results. The performance of theÂ rGO/Fe3O4 composites as the glucose biosensor was examined by varying the mass of Fe3O4 on the composite, using UV-Vis spectroscopy. The performance of the rGO/Fe3O4 composite biosensor in absorbing glucose reached optimum at a mass variation of 0.3 grams of Fe3O4, as demonstrated by by the lowest absorbance peak with an intensity of 0.0048 at a wavelength of 440 nm, corresponding to glucose entrappment of 7.1 mg/gram.

SINTESIS NANOFIBER KITOSAN/PVA SEBAGAI WOUND DRESSING DENGAN METODE ELEKTROSPINNING Kholli Vatul Nur Istiqomah; Diah Hari Kusumawati
Jurnal Inovasi Fisika Indonesia (IFI) Vol 11 No 1 (2022)
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Abstrak Nanofiber kitosan/PVA dapat digunakan sebagai wound dressing karena memiliki sifat bioaktif dan biokompatibel. Pembuatan nanofiber dilakukan dengan menggunakan metode elektrospinning. Penelitian ini menggunakan larutan kitosan dengan konsentrasi 3% dan larutan PVA dengan konsentrasi 10%. Pencampuran larutan kitosan dengan larutan PVA mengunakan perbandingan volume:volume yaitu 1:4, 2:4 dan 3:4. Selanjutnya dilakukan proses elektrospinning dengan parameter meliputi tegangan 20 kV, jarak jarum ke kollektor 15 cm, serta laju alir 5 ml/jam. Nanofiber yang dihasilkan dari proses elektrospinning kemudian dikarakterisasi menggunakan Fourier Transform Infrared (FTIR) yang berfungsi untuk melihat gugus fungsi yang terdapat pada sampel, Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) yang berfungsi untuk melihat morfologi dan material penyusun, dan X-Ray Diffraction (XRD) berfungsi untuk mengidentifikasi fasa kristalin dalam material. Nanofiber yang dihasilkan menunjukkan nanofiber mengandung gugus kitosan dan PVA yang dibuktikan adanya kemiripan spektrum antara nanofiber kitosan/PVA dengan senyawa kitosan dan PVA. Nanofiber kitosan/PVA 1:4 dapat digunakan sebagai wound dressing karena membentuk nanofiber lebih baik dibanding lainnya, dimana fibers yang dihasilkan homogen dengan ukuran fiber yang hampir sama yaitu 177,1 nm, rapat, dan permukaannya halus tanpa adanya beads yang dibuktikan dengan karakterisasi SEM. Kata Kunci: kitosan, elektrospinning, nanofiber, wound dressing Abstract The manufacture of nanofibers was carried out using the electrospinning method. This study used a chitosan solution with a concentration of 3% and a PVA solution with a concentration of 10%. Mixing the chitosan solution with the PVA solution used a volume: volume ratio of 1:4, 2:4 and 3:4. Furthermore, the electrospinning process was carried out with parameters including a voltage of 20 kV, a needle to the collector of 15 cm, and a flow rate of 5 ml/hour. The nanofibers produced from the electrospinning process were then characterized using Fourier Transform Infrared (FTIR) which serves to see the functional groups contained in the sample, Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX) which functions to see the morphology and constituent materials, and X-Ray Diffraction (XRD) serves to identify the crystalline phase in the material The spectrum of similarities between nanofiber chitosan/PVA with chitosan and PVA compounds proves that the produced nanofiber contains the chitosan and PVA group. Chitosan/PVA 1:4 nanofibers can be used as wound dressings because they form nanofibers better than others, where the resulting fibers are homogeneous with almost the same fiber size, namely 177.1 nm, tight, and smooth surface without any beads as evidenced by SEM characterization. Keywords: chitosan, electrospinning, nanofiber , wound dressing

Fabrikasi Nanofiber PVA/Fe3O4 dengan Metode Elektrospinning Nuril Fathurin; Diah Hari Kusumawati
Jurnal Teori dan Aplikasi Fisika Vol 10, No 1 (2022): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v10i1.2911

PVA/Fe3O nanofibers are composite materials contain magnetic materials in nanometer-sized fibers that have biocompatible, non-toxic, and high chemical stability properties. It makes Fe3O nanoparticles suitable for application in the biomedical field as a Drug Delivery System or targeted drug delivery system. Fe3O will be composited with Polyvinyl Alcohol (PVA) and formed into nanofibers. The purpose of this study was to analize the effect of variations in volume % concentration of F Fe3O used on PVA/Fe3O nanofibers. Fe3O was dissolved in dionized water using ultrasonication. The suspension of Fe3O solution was mixed with 10% PVA solution to form PVA/Fe3O solution with Fe3O variations of 5%, 10%, 15%, and 20%. Electrospinning process was carried out on PVA/Fe3O solution with a voltage of 20 kV, flow rate of 5 ml/hour, distance of jet to collector is 15 cm. The results of SEM characterization can be concluded that the one that has the best morphology in this study is PVA/Fe3O nanofiber with a concentration of 10% because it generates uniform nanofibers with the smallest diameter at this concentration, the fibers do not attach to one other, and there are no beads.

KARAKTERISTIK ANTIMIKROBA NANOFIBER PVA/GELATIN SEBAGAI PENUTUP LUKA Musyarofah Dwi Nur Laily; Diah Hari Kusumawati
Jurnal Inovasi Fisika Indonesia (IFI) Vol 11 No 3 (2022): Vol 11 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

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Abstrak Mikroorganisme yang terpapar ke permukaan menyebabkan perlu adanya pengembangan berupa agen antimikroba berbasis nanofiber. Nanofiber banyak diaplikasikan pada produk biomedis salah satunya sebagai penutup luka. Nanofiber yang dihasilkan dari larutan polyvinyl alcohol (PVA) dan gelatin dengan proses elektrospinning. Serat tersebut dilakukan variasi tegangan sebesar 17 kV, 20 kV, dan 23 kV. Dikarakterisasi dengan mikroskop optik, SEM, EDX, FTIR, UV-Vis, dan aktivitas antimikroba. Ukuran diameter nanofiber yang diukur dengan mikroskop optik menurun seiring bertambahnya tegangan. Spektroskopi UV-Vis menunjukkan nanofiber berbahan PVA/Gelatin menghasilkan nanofiber yang memiliki absorbansi tinggi seiring penambahan daya radiasi UV yang diberikan. Spektrum FTIR dengan rentang gelombang 400-4000 cm-1 menunjukkan gugus fungsi yang terlihat yaitu, O-H stretching, C-H stretching, C-O stretching, C=O stretching dan C-H bending. Morfologi dan distribusi PVA/Gelatin ditunjukkan oleh SEM dengan diameter berkisar 140 – 160 nm, dengan unsur yang terdapat pada spektrum EDX yaitu C, O, dan N masing-masing 29,96%, 8,76%, dan 61,28%. Aktivitas antimikroba efektif hingga 47,5% dan efisien sampai dengan 2 jam. Sehingga nanofiber PVA/Gelatin dapat dijadikan acuan biomaterial sebagai penutup luka. Kata Kunci: Nanofiber, PVA, Gelatin, antimikroba Abstract Microorganisms exposed to the surface cause the need for the development of nanofiber-based antimicrobial agents. Nanofiber is widely applied to biomedical products, one of which is as a wound dressing. Nanofiber produced from a solution of polyvinyl alcohol (PVA) and gelatin with an electrospinning process. The fiber is subjected to voltage variations of 17 kV, 20 kV, and 23 kV. Characterized by optical microscopy, SEM, EDX, FTIR, UV-Vis, and antimicrobial activity. The size of the nanofiber diameter as measured by optical microscopy decreased with increasing stress. UV-Vis spectroscopy showed that nanofibers made from PVA/Gelatin produced nanofibers with high absorbance as the UV radiation power was added. The FTIR spectrum with a wave range of 400-4000 cm-1 shows visible functional groups, namely, O-H stretching, C-H stretching, C-O stretching, C=O stretching and C-H bending. The morphology and distribution of PVA/Gelatin was shown by SEM with diameters ranging from 140 – 160 nm, with elements contained in the EDX spectrum namely C, O, and N respectively 29.96%, 8.76%, and 61.28%. Effective antimicrobial activity up to 47.5% and efficient up to 2 hours. So that PVA/Gelatin nanofibers can be used as a reference for biomaterials as wound dressings. Keywords: Nanofiber, PVA, Gelatin, antimicrobial

Nanofiber PVA/Kitosan Sebagai Wound Dressing Indah Yuliani; Diah Hari Kusumawati
Jurnal Inovasi Fisika Indonesia (IFI) Vol 11 No 3 (2022): Vol 11 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

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Abstrak Nanoteknologi adalah ilmu pengetahuan yang mengalami perkembangan pesat, salah satunya dibidang nanofiber. Dalam bidang kesehatan nanofiber dapat diaplikasikan sebagai wound dressing. PVA dapat diaplikasikan sebagai wound dressing karena sifatnya yang tidak beracun, namun PVA memiliki kelemahan yakni hidrofisilitas yang tinggi sehingga mempengaruhi sifat mekanik dari PVA. Oleh sebab itu PVA perlu dikompositkan dengan polimer lain yaitu kitosan. Kitosan digunakan untuk meningkatkan viskositas dan memiliki karakteristik yakni sifat biokompatibel dan antimikroba. Pembuatan komposit nanofiber PVA/Kitosan dilakukan dengan menggunakan metode elektrospinning. Kemudian nanofiber dikarakterisasi menggunakan Fourier Transform Infrared Spectroscopy (FTIR), UV Vis Spectroscopy, Scanning Electron Microscope-Energy Dispersive X-Ray (SEM), Energy Dispersive X-Ray (EDX), Antibacterial Assay. Nanofiber yang dihasilkan dari proses elektrospinning menunjukkan komposit nanofiber PVA/Kitosan pada tegangan 21 kV memiiliki nilai absorbansi yang tinggi dengan rentang panjang gelombang 200-300 nm. Komposit nanofiber menunjukkan bahwa terdapat kandungan gugus fungsi dari PVA dan komposit nanofiber PVA/Kitosan. Nanofiber PVA/Kitosan pada tegangan 21 kV dapat digunakan sebagai wound dressing, hal ini dikarenakan ukuran diameter dari fibers yaitu sebesar 130,1 nm, homogen, rapat, serta permukaan halus tanpa beads berdasarkan karakterisasi SEM. Komposit nanofiber PVA/Kitosan efektif digunakan sebagai wound dressing yakni pada waktu inkubasi jam ke-3 dengan efisiensi 78,8% berdasarkan uji antibakteri yang telah dilakukan. Kata Kunci: PVA, kitosan, nanofiber, elektrospinning, wound dressing Abstract Nanotechnology is a science that is experiencing rapid development, one of which is in the field of nanofibers. In the health sector, nanofiber can be applied as a wound dressing. PVA can be applied as a wound dressing because it is non-toxic, but PVA has the disadvantage of high hydrophilicity, whic affects the mechanical properties of PVA. Therefore, PVA needs to be composed with other polymers, namely chitosan. Chitosan is used to increase viscosity and has the characteristics of being biocompatible and antimicrobial. The manufacture of PVA/Chitosan nanofiber composites was carried out using the electrospinning method. Then the nanofibers were characterized using Fourier Transform Infrared Spectroscopy (FTIR), Uv Vis Spectroscopy, Scanning Electron Microscope-Energy Dispersive X-Ray (SEM), Energy Dispersive X-Ray (EDX). voltage 21 kV has a high absorbance value with a wavelength range of 200-300 nm. The nanofiber composites showed that there was a functional group content of PVA and PVA/Chitosan nanofiber composites. PVA/chitosan nanofibers at a voltage of 21 kV can be used as wound dressings, this is because the diameter of the fibers is 130.1 nm, homogeneous, tight, and has a smooth surface without beads based on SEM characterization. PVA/Chitosan nanofiber composites was effeectively used as a wound dressing, namely at the incubation time of 3 hours with an efficiency of 78,8% based on the antibacterial test that had been carried out. Keywords: PVA, chitosan, nanofiber, electrospinning, wound dressing

FABRIKASI DAN KARAKTERISASI NANOFIBER PVA/PVP/KITOSAN SEBAGAI BAHAN DASAR WOUND DRESSING Arsha Bayu Rahanti; Diah Hari Kusumawati
Jurnal Inovasi Fisika Indonesia (IFI) Vol 11 No 3 (2022): Vol 11 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

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Abstrak Elektrospinning adalah metode yang digunakan untuk menghasilkan serat dengan ukuran diameter dari nanometer hingga mikrometer. Nanofiber yang dihasilkan dapat diaplikasikan sebagai rekayasa jaringan, penghantaran obat pada antikanker, kosmetik, dan sebagai wound dressing. Pada penelitian ini bertujuan untuk mengetahui fabrikasi nanofiber PVA/PVP/Kitosan dapat dijadikan sebagai bahan dasar wound dressing. Fabrikasi nanofiber tersebut dilakukan dengan menggunakan metode elektrospinning. Parameter proses elektrospinning menggunakan laju alir 1 ml/jam, jarak jarum antar kolektor sejauh 15 cm, serta variasi tegangan sebesar 15 kV, 18 kV, dan 21 kV. Hasil yang didapatkan akan dikarakterisasi menggunakan MO, UV-Vis, FT-IR, SEM-EDX, dan antibakteri. Berdasarkan hasil karakterisasi MO menunjukkan bahwa semakin tinggi tegangan yang disuplai antara drum kolektor dan jarum, maka ukuran diameter nanofiber tersebut semakin kecil. Hasil Uv-Vis menunjukkan bahwa fabrikasi ini mampu menyerap cairan yang berasal dari cairan pada luka dan cairan disekitar luka. Hasil FTIR diperoleh gugus fungsi O-H stretch pada puncak serapan PVA, gugus fungsi N-H bend pada puncak serapan kitosan dan gugus fungsi C-O stretch pada puncak serapan PVP. Karakterisasi SEM menunjukkan bentuk morfologi permukaan yang halus dan ukuran diameter serat pada PVA 10% sekitar 210-225 nm mengalami penurunan pada PVA/PVP/Kitosan 18 kV sekitar 170-195 nm. Hasil EDX menunjukkan bahwa material pembentuk polimer PVA, PVP, dan kitosan terdapat pada fabrikasi nanofiber ini. Hasil antibakteri pada sampel PVA/PVP/Kitosan tegangan 18 kV menggunakan bakteri S.aereus dengan konsentrasi 100 µl/ml menghasilkan efisiensi antibakteri tertinggi sebesar 56,8% dalam waktu inkubasi 3 jam. Kata Kunci: Elektrospinning, Nanofiber, Wound Dressing Abstract Electrospinning is a method used to produce fibers with diameters from nanometers to micrometers. The resulting nanofibers can be applied as tissue engineering, drug delivery in anticancer, cosmetics, and as wound dressings. This study aims to determine the fabrication of PVA/PVP/Chitosan nanofibers that can be used as a basic material for wound dressings. The nanofiber fabrication was carried out using the electrospinning method. The electrospinning process parameters used a flow rate of 1 ml/hour, a needle distance between collectors of 15 cm, and a voltage variation of 15 kV, 18 kV, and 21 kV. The results obtained will be characterized using MO, UV-Vis, FT-IR, SEM-EDX, and antibacterial. Based on the results of MO characterization, it shows that the higher the voltage supplied between the collector drum and the needle, the smaller the diameter of the nanofiber. Uv-Vis results show that this fabrication is able to absorb fluids from the fluid in the wound and the fluid around the wound. FTIR results obtained O-H stretch functional group at the peak of PVA absorption, N-H bend functional group at the peak of chitosan absorption and C-O stretch functional group at the peak of PVP absorption. SEM characterization showed a smooth surface morphology and fiber diameter at 10% PVA around 210-225 nm decreased at 18 kV PVA/PVP/Chitosan around 170-195 nm. The EDX results show that the polymer-forming materials of PVA, PVP, and chitosan are present in this nanofiber fabrication. Antibacterial results on 18 kV PVA/PVP/Chitosan samples using S.aereus bacteria with a concentration of 100 l/ml resulted in the highest antibacterial efficiency of 56,8% within 3 hours of incubation. Keywords: Electrospinning, Nano Fiber, Wound Dressing

Fabrikasi dan Karakterisasi Nanofiber PVA-Graphene Oxide (GO) sebagai Separator Baterai Lithium-Ion Diah Hari Kusumawati; Tia Nur Agustin
Jurnal Inovasi Fisika Indonesia (IFI) Vol 12 No 1 (2023): Vol 12 No 1
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n1.p1 - 13

Abstrak Separator adalah komponen utama dalam baterai litium-ion yang berfungsi mencegah kemungkinan konsleting listrik dan transportasi ion bebas sekaligus mengisolasi aliran listrik. Separator harus memiliki porositas yang memadai, konduktivitas yang tinggi dan stabilitas termal yang baik. Nanofiber PVA-GO dibuat dengan metode elektrospinning digunakan sebagai separator baterai Lithium-Ion. Variasi penambahan Graphene Oxide (GO) yang digunakan 0,1-0,3. Hasil pengukuran diameter awal dengan Mikroskop optik diameter rata-rata PVA adalah 0.63 μm dan PVA-GO adalah 0.52 μm-0.70 μm. Spektrum FTIR PVA, gugus O-H stretch terdeteksi pada 3285 cm-1 merupakan gugus hidroxyl yang disebabkan oleh frekuensi peregangan OH dari PVA. Pada PVA-0.3 GO puncak 1651 cm-1, dan 1091 cm-1 terdekteksi C=O stretch dari gugus fungsi carboxyl dan carboxylic dari GO, dan C-O stretch yang dideteksi sebagai epoxy dari GO. Adanya puncak pada 1651 cm-1 menegaskan adanya GO dalam komposit PVA-GO. Hasil uji SEM menghasilkan diameter rata-rata nanofiber PVA adalah 216 nm, dan nanofiber PVA-GO 0,1 dan 0,3 adalah 162 nm dan 194 nm. Nilai porositas nanofiber PVA adalah 44 % dan nanofiber PVA berbagai konsentrasi GO adalah 53%, 47%, dan 42%. Hasil pemanasan nanofiber menunjukkan stabilitas termal yang baik. Hasil EIS nanofiber PVA, memiliki nilai impedansi 356,20 kΩ dengan nilai konduktivitas 0,3 x 10-4 S/cm dan PVA-GO dari 0,1-0,3 nilai impedansinya adalah 39,84 kΩ; 71,99 kΩ dan 392,05 kΩ dan nilai konduktivitas masing-masing adalah, 2,66 x 10-4 S/cm., 1,47 x 10-4 S/cm., 0,27 x 10-4 S/cm. Dari karakterisasi yang telah dilakukan, nanofiber PVA-GO memenuhi kriteria sebagai separator baterai Lithim-ion. Kata Kunci: Nanofiber, PVA-GO, Separator Abstract The separator is the main component in a lithium-ion battery which functions to prevent possible electrical short circuits and transport of free ions while isolating the flow of electricity. The separator must have sufficient porosity, high conductivity and good thermal stability. PVA-GO nanofiber made by the electrospinning method is used as a Lithium-Ion battery separator. Variation of the addition of Graphene Oxide (GO) used 0,1-0,3. The results of the initial diameter measurement with an optical microscope average diameter of PVA is 0.63 μm and PVA-GO, is 0.52 μm-0.70 μm. In the FTIR spectrum of PVA, the O-H stretch detected at 3285 cm-1 is a hydroxyl group caused by the OH stretching frequency of PVA. In PVA-0.3 GO the peaks of 1651 cm-1 and 1091 cm-1 were detected as C=O stretches from the carboxyl and carboxylic functional groups of GO, and C-O stretches were detected as epoxy from GO. The presence of a peak at 1651 cm-1 confirmed the presence of GO in the PVA-GO composite. SEM test results showed that the average diameter of PVA nanofibers was 216 nm, and PVA-GO 0.1 and 0.3 nanofibers were 162 nm and 194 nm. The porosity value of the PVA nanofiber was 44% and each of the various GO concentration nanofibers were 53%, 47%, and 42%. The results of nanofiber heating showed good thermal stability. The results of the PVA nanofiber EIS, has an impedance value of 356.20 kΩ with a conductivity value 0.3 x 10-4 S/cm and PVA-GO of 0.1-0.3 the impedance values are; 39.8 kΩ; 71.99 kΩ and 392.05 kΩ and the conductivity values were, respectively, 2.66 x 10-4 S/cm, 1.47 x 10-4 S/cm, 0.27 x 10-4 S/cm. From the characterization that has been carried out, PVA-GO nanofiber fulfills the characteristic requirements as a Lithium ion battery separator. Keywords: Nanofiber, PVA-GO, Separator

Karakteristik Porositas Wound Dressing Nanofiber PVA-Ekstrak Daun Nangka Andi Yasnita Tasya; Diah Hari Kusumawati
Inovasi Fisika Indonesia Vol 12 No 3 (2023): IN PRESS Vol 12 No 3
Publisher : Jurusan Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n3.p106-112

Tanaman nangka memiliki potensi sebagai bahan dasar pembuatan wound dressing karena mengandung senyawa flavonoid, saponin dan tanin yang berfungsi sebagai antibakteri terutama pada bagian daun. Kriteria wound dressing dapat dilihat dari beberapa hal, salah satunya porositas. Porositas mempunyai fungsi yang sangat penting di dalam wound dressing. Semakin kecil porositas, maka daya hambat bakteri dari wound dressing semakin baik, namun perlu dipertimbangkan terkait sirkulasi dari udara dalam menjaga kelembaban luka, sehingga perlu dilakukan penelitian khusus tentang hal tersebut. Tujuan dari penelitian ini adalah untuk menganalisis porositas nanofiber PVA-ekstrak daun nangka, yang mampu menjaga kelembaban namun tetap mampu menghambat bakteri. Penelitian diawali dengan proses ekstraksi daun nangka, membuat larutan PVA-ekstrak daun nangka dengan komposisi 5, 10, 15 dan 20% dan dilanjutkan dengan fabrikasi nanofiber menggunakan metode electrospinning. Nanofiber yang dihasilkan diuji dengan metode bayangan SEM menggunakan software OriginPro 2023, diperoleh nilai porositas nanofiber sebesar 39,93% pada komposisi ekstrak daun nangka sebesar 20%. Kata Kunci: Porositas, Nanofiber, Wound dressing Abstract Jackfruit plant has the potential as a raw material for making wound dressings because it contains flavonoids, saponins and tannins which function as antibacterial, especially in the leaves. Criteria for wound dressings can be seen from several things, one of which is porosity. Porosity has a very important function in wound dressings. The smaller the porosity, the better the bacterial inhibition of the wound dressing, but it is necessary to consider the circulation of air in maintaining wound moisture, so special research is needed on this matter. The purpose of this study was to analyze the porosity of the PVA nanofiber-jackfruit leaf extract, which is able to retain moisture but still able to inhibit bacteria. The research began with the process of extracting jackfruit leaves, making a solution of PVA-jackfruit leaf extract with a composition of 5, 10, 15 and 20% and continued with nanofiber fabrication using the electrospinning method. The resulting nanofiber was tested using the SEM shading method using OriginPro 2023 software. It obtained a nanofiber porosity value of 39.93% in a composition of 20% jackfruit leaf extract. Keywords: Porosity, Nanofiber, Wound dressing

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