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All Journal Indonesian Physical Review Jurnal Abdi: Media Pengabdian Kepada Masyarakat Sains dan Matematika Inovasi Fisika Indonesia (IFI) Dedikasi: Journal of Community Engagement and Empowerment Journal of Dedication in Community (JoDiC)
Lydia Rohmawati
Jurusan Fisika, FMIPA, Universitas Negeri Surabaya Gedung C9 Lt. 1, Ketintang, Surabaya 60231
Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Characterisation of Rhizome Extract (Curcuma xanthorrhiza Roxb) Ointment as an Anti-Acne Remedy Ferdianto, Sandy Prayoga; Syafaah, Lailatus; Rohmawati, Lydia
Journal of Dedication in Community Vol. 1 No. 2 (2023)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Negeri Surabaya (UNESA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jodic.v1n2.p29-37

Abstract

Skin is one of the five senses of humans that functions as a thermostat in maintaining body temperature, protecting the body from attack by microorganisms, ultraviolet rays, and regulating blood pressure. However, insufficient protection factors make the skin easily infected by bacteria that can cause skin diseases. One such disease is acne. Acne occurs when anaerobic bacteria such as Staphyloccocus aureus multiply rapidly in the deep skin layers. This study was conducted to overcome acne on the skin by using an ointment preparation made from temulawak rhizome. This research uses qualitative and quantitative methods with data collection techniques through organoleptic testing, homogeneity, pH, spreadability, adhesion, and irritation. The subjects in this study were physics students at Surabaya State University with a total of 5 students. The results showed that the organoleptic test on the preparation of temulawak rhizome extract ointment was semi-solid, brownish yellow in colour, and the distinctive smell of temulawak rhizome extract. The Ph test showed a value of 5 equal to the normal pH of the skin and no irritation on the volunteer's skin. The ointment formulation had no effect on its homogeneity and had excellent adhesion
ANALISIS KARAKTERISTIK KOMPOSIT PULP KERTAS DAN SERABUT KELAPA UNTUK PEMBUATAN BAHAN BAKU KERTAS RAMAH LINGKUNGAN Pratiwi; Rohmawati, Lydia; Suaebah, Evi
Inovasi Fisika Indonesia Vol. 14 No. 2 (2025): Vol 14 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v14n2.p141-151

Abstract

Abstrak Penelitian ini bertujuan untuk menganalisis karakteristik komposit pulp kertas daur ulang dan serat kelapa sebagai bahan baku pembuatan kertas ramah lingkungan. Proses penelitian mencakup persiapan pulp kertas dari kertas bekas dan serat kelapa yang diproses menjadi serbuk, yang kemudian dicampur dengan berbagai rasio massa (0:100, 20:80, 30:70, dan 40:60). Pengujian dilakukan untuk mengukur tebal, gramatur, daya serap air, dan kekuatan tarik kertas dengan mengacu pada standar (SNI 7274:2008) dan (SNI-ISO-1924-2-2016). Hasil uji tebal kertas menunjukkan bahwa perbedaan rasio massa tidak memberikan pengaruh signifikan terhadap tebal kertas, sebagian besar hasil komposit memiliki tebal rata-rata 0.13 mm. Pengujian selanjutnya berupa uji gramatur yang memberikan hasil sebesar 108 – 200 g/mm2, dari dua uji tersebut dapat digunakan untuk menghitung nilai bulk kertas. Hasil perhitungan bulk kertas menyatakan bahwa semua sampel telah memenuhi standart (SNI 7274:2008) yang memiliki nilai dibawah 1.5 cm3/gr. Komposisi  serat kelapa dan pulp kertas (20:80) pada penelitian ini memiliki kuat tarik sebesar 2.73 kN/m dan daya regang  1.37% menjadi pilihan komposisi rasio paling optimal sesuai standar (SNI-ISO-1924-2-2016). Penambahan serat kelapa pada pulp kertas dapat meningkatkan kekuatan tarik melalui efek penguatan, sedangkan pada rasio serat yang lebih tinggi (>30), terjadi penurunan kualitas akibat distribusi serat yang tidak merata dan ikatan yang lemah dalam pulp kertas. Dengan demikian, hasil penelitian ini dapat dijadikan alternatif produk kertas daur ulang yang ekonomis yang memiliki karakteristik yang sesuai dengan standar yang telah ditentukan.   Abstract This study aims to analyze the characteristics of recycled paper pulp and coconut fiber composites as raw materials for environmentally friendly paper production. The research process includes the preparation of paper pulp from waste paper and coconut fibers processed into powder, which is then mixed in various mass ratios (0:100, 20:80, 30:70, and 40:60). Tests were conducted to measure the thickness, grammage, water absorption, and tensile strength of the paper, referring to the standards (SNI 7274:2008) and (SNI-ISO-1924-2-2016). The paper thickness test results indicate that variations in mass ratio do not significantly affect the paper thickness, with most composite samples having an average thickness of 0.13 mm. The grammage test results ranged from 108 to 200 g/mm², and these two tests were used to calculate the paper bulk value. The bulk calculation results show that all samples met the SNI 7274:2008 standard, which requires a bulk value below 1.5 cm³/g. The 20:80 composition of coconut fiber and paper pulp in this study exhibited a tensile strength of 2.73 kN/m and an elongation of 1.37%, making it the most optimal ratio according to the SNI-ISO-1924-2-2016 standard. The addition of coconut fiber to paper pulp enhances tensile strength through a reinforcement effect, while higher fiber ratios (>30) result in a decline in quality due to uneven fiber distribution and weak bonding within the paper pulp. Therefore, the findings of this study provide an economical alternative for recycled paper products that meet the specified standards.  
Sintesis CaCO3 dari Dolomit Bangkalan dengan Metode Leaching: - Veronika, Angelina O; Rohmawati, Lydia
Sains dan Matematika Vol. 7 No. 1 (2022): April, Sains & Matematika
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/sainsmat.v7n1.p39-42

Abstract

Kalsium karbonat (CaCO3) merupakan biomaterial inorganik yang dapat diaplikasikan untuk pengobatan dan antibakteri. Material ini dapat diekstrak dari batuan dolomit, dimana diketahui kandungan CaO dari dolomit Bangkalan adalah 63,42%. Penelitian ini bertujuan untuk mengidentifikasi fasa dari sampel CaCO3 beserta gugus fungsinya. Sintesis CaCO3 menggunakan metode leaching yaitu melarutkan serbuk dolomit dengan HCl dan aquades, lalu diaduk dalam waktu 45 menit pada suhu 75°C. Setelah itu, larutan disaring dan filtratnya ditambahkan amoniak hingga pH larutan 12, kemudian dialiri gas CO2 2,8 liter/menit dan hasilnya dikeringkan selama 24 jam pada suhu 60°C. Selanjutnya sampel dikarakterisasi X-Ray Diffraction (XRD) dan Fourirer Transform Infra Red (FTIR) untuk mengetahui fasa kristal dan gugus fungsi dari CaCO3. Hasil analisis XRD menunjukkan material CaCO3 memiliki fasa kalsit (87,31%) dan vaterit (12,69%). Hal ini sesuai dengan pdf cards database kalsit (96-900-0966) dan vaterite (96-900-7476). Hasil FTIR menunjukkan material CaCO3 memiliki gugus fungsi Ca-O, C-H, C-O, O-H dan carboxyl pada puncak serapan 4000-400 cm-1. Dengan demikian, terbentuknya material CaCO3 dengan metode leaching ini dapat dikembangkan dalam skala besar dikarenakan biaya murah, peralatan sederhana dan diperoleh dari sumber daya alam yang melimpah. Kata Kunci: CaCO3, dolomit, sintesis, leaching
ANALYSIS OF CRYSTALLINE PHASE AND FUNCTIONAL GROUPS OF ZnO FROM PINEAPPLE PEEL EXTRACT Santika, Rosalia; Rohmawati, Lydia
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.160

Abstract

The use of pineapple peel has not been paid attention to because of the lack of public knowledge regarding the content and benefits of pineapple skin. However, it can use pineapple skin for herbal drinks and animal feed. Pineapple peel has phytochemical compounds and bioactive compounds such as ZnO. Therefore, this study was conducted to determine ZnO's crystalline phase and the functional group from pineapple peel extract. Synthesis of ZnO from pineapple peel extract used the green synthesis method, with the following steps: pineapple peel was pounded and stirred by heating at 80°C, and then ultrasonicated. The solution was added with NaOH and centrifuged at 4000 rpm. This result is heated at a temperature of 120°C with a 6 and 12 hours holding time. After that, it cooled to room temperature. The results of XRD analysis obtained the optimal ZnO crystalline phase at a holding time of 12 hours according to the pdf cards database (96-210-7060) and nanocrystalline size of 17.55 nm. The FTIR results on the ZnO sample had an absorption peak of 4000-400cm-1 with functional groups O-H alcohol and phenol, -C=C alkene, C=O, C-O, C-N, and Zn-O. It is hoped to be applied later in the medical and industrial fields by obtaining ZnO samples from pineapple peel extract
PHOTOCATALYST ACTIVITY OF MgO FROM BANGKALAN DOLOMITE Rahmawati, Isna; Rohmawati, Lydia
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.162

Abstract

In the industrial sector, water pollution due to dye waste needs special attention because it can harm humans and the environment. A waste-absorbing material with good photocatalytic properties is required to overcome this problem. The photocatalytic properties are owned by metal oxide materials, one of which is Magnesium Oxide (MgO) material. This study aims to analyze the activity level of MgO photocatalytic from Bangkalan dolomite. MgO synthesis was carried out by the leaching method, where UV-Vis characterized the results to determine the photocatalytic ability of MgO against methylene blue (MB). In this characterization, various treatments (sunlight, UV light, and darkroom conditions) were carried out with radiation times of 180, 240, and 300 minutes. The results of the UV-Vis spectrum analysis showed that MgO had a band gap of 4.01 eV. The degradation efficiency of photocatalytic obtained optimal under sunlight, UV light, and in a dark room with a radiation time of 300 minutes at 82%, 42%, and 34%. Thus, the synthesis of MgO in sunlight showed good photocatalytic activity in reducing MB dye to use for processing waste from the dye industry.
SYNTHESIS OF CALCIUM CARBONATE (CaCO3) FROM EGGSHELL BY CALCINATION METHOD Diningsih, Candra; Rohmawati, Lydia
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.174

Abstract

Calcium is an essential nutrient the human body needs to control blood pressure and maintain strong bones and teeth. One type of calcium that is often consumed and safe for health is calcium carbonate. It can obtain this material from chicken eggshell waste, where it is known that the CaCO3 content is 95%. Therefore, it conducted this research to see the phase, functional group, absorbance level, and energy band gap of CaCO3 samples. CaCO3 was synthesized using the calcination method, in which the egg shells were first soaked in sodium hypochlorite, then dried at 250°C for 10 minutes, and CaCO3 powder was obtained. Then the powder was characterized by XRD, FTIR, and UV-Vis. The results of XRD analysis showed that the calcite phase of CaCO3 was 100% according to the JCPDS PDF of calcite (96-901-6707) with a crystalline size of CaCO3 of 22.6 nm. The results of FTIR of CaCO3 samples at the absorption peak of 4000-500 cm-1 identified the functional groups of Ca-O, C-O, -CH2, and O-H. CaCO3 samples can absorb light at wavelengths of 237.1 nm, 251.5 nm, and 289.7 nm, which have an energy band gap of 3.91 eV. Thus, using this simple calcination method, the CaCO3 sample obtained from the extraction of chicken egg shells can later be applied in the medical field.
FABRIKASI OF Fe3O4/ZnO NANOCOMPOSITE BY ULTRASONICATION METHOD AND ITS APPLICATION FOR ANTIBACTERIAL Oktavia, Anggraini Dwi; Rohmawati, Lydia
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.175

Abstract

The spread of diseases caused by bacteria seriously threatens human health. Alternative materials with antibacterial effects are needed to overcome this problem, such as Fe3O4/ZnO. This study aims to determine the activity of the antibacterial inhibition zone on Fe3O4/ZnO nanocomposites. The Fe3O4/ZnO nanocomposite fabrication used the ultrasonication wave method. Characterization was performed using X-ray diffraction (XRD), Fourier Transforms Infrared (FTIR), and antibacterial activity tests. The results of the XRD analysis showed that the average crystal size was about 42 nm for Fe3O4, 36 nm for ZnO, and 39 nm for Fe3O4/ZnO. The FTIR results on the nanocomposite showed the characteristics of the Fe-O group at the absorption peak of 874.93 and 691.29 cm-1, while at 436.56 cm-1 indicated the presence of Zn-O compound bonds. The Fe3O4/ZnO nanocomposite with a weight ratio (1:10) showed good effectiveness in inhibiting S. aureus and E. coli bacteria at concentrations of 0.8 mg/m and 1 mg/ml. Meanwhile, in E. coli bacteria, the average diameter of the inhibition zone was relatively low. Thus Fe3O4/ZnO nanocomposite has the potential to be applied in antibacterial applications
PHASE AND FUNCTIONAL GROUPS ANALYSIS OF ZNO NANOCRYSTALLINE SYNTHESIZED FROM CITRUS ORANGE PEEL Ma’arif, M. Samsul; Alfina, Fitria Tahta; Pratiwi, Devi Ragita Putri; Rohmawati, Lydia
Indonesian Physical Review Vol. 7 No. 3 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i3.338

Abstract

The high production and market demand for citrus fruits can increase environmental waste. Most people do not use orange peel waste even though this peel contains bioactive compounds and phytochemicals that have the potential to form ZnO using the green synthesis method. This new research offers an environmentally friendly solution to reducing orange peel waste using abundant natural resources for nanotechnology applications. Therefore, this research aims to identify the phase of ZnO material and functional groups from orange peel extract. The extraction method of ZnO from Citrus sinensis orange peel uses green synthesis. The analysis in this research indicates that the sample has the phase of a zincite crystalline and a nanocrystalline size of 12.98 nm. The sample has an absorption peak at a wave number of 4000 – 400 cm-1 with functional groups indicating OH, C=C, Zn-OH, and Zn-O stretching vibration
Co-Authors Adiono, Muchammad Adiyanto, Afandi Putra alfan, mohamad wafiq nafii alfan Alfina, Fitria Tahta Alhamidy, Muh. Hakim Amanati, Anis Yulia Arief, Alimufia Diah Hari Kusumawati DIAN SAVITRI Dina Kartika Maharani Diningsih, Candra Ella, Isbatus Sabillah Fathoni, Silviana Nurul Ferdianto, Sandy Prayoga Fidiyanti, Yuvita Nur Fitriana Fitriana Hefdea, Ajeng Imam Sucahyo Isna Rahmawati, Isna istiqomah istiqomah Krisdiana, Anita Kurniasari, Laily Yosie Lailia, Lytha Rizqika Lala, Lailatus Syafa'ah Ma’arif, M. Samsul Millenia, Salsabila Happy Mita Anggaryani Mufida, Nur MUNASIR Muyasaroh, Anisa Fitri Nugrahani Primary Putri NUGRAHANI PRIMARY PUTRI Oktavia, Anggraini Dwi Pratiwi Pratiwi, Devi Ragita Putri Puji Rahayu Rachmawati, Tsaniyah Nabilah Rahayu, Nella Puji Rahmawati, Diah Ayu Rizky Firmansyah Santika, Rosalia Sholikah, Ria Inus Styarsih, Woro Suaebah, Evi Syafaah, Lailatus Utama Alan Deta Veronika, Angelina O Woro Setyarsih Wulancahayani, Entang