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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmiah Arena Tekstil Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Chemistry Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat SEMAR Equilibrium Journal of Chemical Engineering Bulletin of Chemical Reaction Engineering & Catalysis
Hendri Widiyandari
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Sebelas Maret
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences

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PEMBUATAN KOMPOSIT CARBON NANOTUBE-POLYVINYL ALCOHOL (CNT-PVA) SERTA EVALUASI SIFAT MEKANIKNYA Wahyudi, Tatang; Setyaningsih, Metri; Subagio, Agus; Widiyandari, Hendri; Pardoyo, Pardoyo; Ahyani, Musni
Arena Tekstil Vol 27, No 1 (2012)
Publisher : Arena Tekstil

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Abstract

Perkembangan teknologi nanomaterial mendukung teknologi komposit. Komposit yang menggunakannanomaterial menghasilkan sifat mekanik yang lebih baik daripada komposit biasa. Komposit carbon nanotubes(CNT) berpotensi memiliki kekuatan tarik yang tinggi oleh adanya struktur tabung nanonya yang baik sebagaimatrik. Komposit CNT-PVA telah dibuat dengan metode pelarutan. Polyvinyl alcohol (PVA) dilarutkan dalam airbertemperatur 80°C, selanjutnya material CNT ditambahkan ke dalam larutan tersebut dengan variasi fraksi massaCNT terhadap PVA sebesar 10%, 20% dan 30%. Komposit CNT-PVA terbentuk setelah dikeringkan padatemperatur 80°C. Selanjutnya sifat mekanik komposit dikarakterisasi dengan uji kekuatan tarik. Hasil ujimenunjukkan bahwa komposit CNT-PVA dengan fraksi massa 20% CNT terhadap PVA menghasilkan modulusYoung yang paling besar yaitu 137,71MPa. Ketebalan komposit 0,94 mm yang dibangun oleh tiga lapis tipiskomposit CNT-PVA menghasilkan peningkatan modulus Young hingga 107,30%.
STUDI PENGARUH UKURAN PIXEL IMAGING PLATE TERHADAP KUALITAS CITRA RADIOGRAF Sudin, Ahmas; Muhlisin, Zaenul; Widiyandari, Hendri
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

This study aims is to determine the image on imaging plate which has a different pixel sizes. In this research, the X-ray apparatus and Computed Radiography (CR) which is used in the diagnostic field was used. The three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it was used. The exposure factor was adjusted at 64.5 kV and 16 mAs. The each of imaging plate were exposure three times. The results of each radiograph imaging plate were measured by using a densitometer. By measuring the Stepwedge radiograph, it was obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate were compared to obtain the imaging plate that have a higher contrast value. This research resulted that each different pixel sizes on the imaging plate would generate a different image quality. Keywords: pixel, imaging plate, image quality, contras, density
Degradasi Pewarna Methylene Blue (MB) Menggunakan Fotokatalis WO3/Fe2O3 dengan Perbantuan Cahaya Matahari Widiyandari, Hendri; Syam, Burhanudin
JURNAL SAINS DAN MATEMATIKA Volume 20 Issue 2 Year 2012
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Degradation of dangerous pollutant with photocatalyst under solar or visible light radiation was a smart solution for environment pollution complication specifically for wastewater. an efficient photocatalyst which works at under wide spectrum from solar radiation. We reported the of tungsten oxide/ferric oxide (WO3/Fe2O3) composite with 6 variant weight ratio Fe additve (0%, 2%, 4%, and 6%).. Methylene blue photodegradation result showed, the decrease intensity of C/C0 concentration  more faster and constant especially for 6% additive co-catalyst Fe. Then, the photodegradation sample has result more pure than 5 sample others.   Keywords: WO3/Fe2O3, Photodegradation, photodeposition method, composite material, co-catalyst
Deposisi Nanopartikel Titanium Dioksida (Tio2) di atas Gelas Transparan Konduktif dan Aplikasinya sebagai Elektroda Kerja pada Sel Surya Berbasis Dye (DSSC) Wahyudi, Bayu; Widiyandari, Hendri
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 4 Year 2011
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Untuk mengantisipasi krisis energi beberapa dekade ke depan ini, sel surya tersensitasi zat pewarna (dye) telah dipertimbangkan sebagai salah satu sumber energi terbarukan yang sangat potensial. Dalam penelitian ini, telah berhasil dibuat elektroda aktif dari nanopartikel TiO2 yang dideposisikan diatas gelas transparan konduktif TCO dengan metode Doctor blade. Nanopartikel TiO2 yang telah dideposisikan kemudian dikarakterisasi menggunakan SEM (scanning electron microscopy) untuk mengetahui sruktur morfologi permukaan. Performa fotovoltaik dari sel surya DSSC telah diukur berdasarkan nilai voltase sirkuit terbuka (Voc) dan dikorelasikan terhadap rapat arus sirkuit pendek (Jsc) . Dari hasil pengujian terhadap performa DSSC diperoleh efisiensi maksimum dengan Voc = 0.68 V dan Jsc= 4.34 mA/cm2. Kata kunci: DSSC, nanopartikel TiO2, metode Doctor blade, fotovoltaik, efisiensi konversi
Pembuatan dan Karakterisasi Komposit CNT/PVA Setyaningsih, Metri; Widiyandari, Hendri; Subagio, Agus
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 3 Year 2013
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Komposit CNT/PVA telah dibuat dengan metode solution processing. Polyvinyl alcohol (PVA) dilarutkan dalam akuades bertemperatur 80°C, dan kemudian carbon nanotubes (CNT) ditambahkan ke dalam larutan tersebut dengan berbagai variasi rasio fraksi massa CNT/PVA sebesar 10, 20 dan 30%. Komposit CNT/PVA terbentuk setelah dikeringkan dalam oven bertemperatur 90°C. Sifat mekanik komposit CNT/PVA dikarakterisasi dengan uji tarik. Komposit CNT/PVA yang memberikan sifat mekanik terbaik selanjutnya digunakan sebagai acuan dalam pembuatan komposit dengan variasi ketebalan. Komposit dengan variasi ketebalan dibuat dengan 3 metode yaitu cetak tebal, cetak lapis tebal dan cetak lapis tipis. Analisis dari uji tarik menunjukkan bahwa komposit CNT/PVA dengan fraksi massa 20% CNT/PVA  menghasilkan modulus Young yang paling besar yaitu 137,710348 MPa. Metode cetak lapis tipis menunjukkan peningkatan yang lebih besar dibandingkan dengan metode cetak tebal, dan cetak lapis tebal. Komposit dengan 3 lapis dan ketebalan 0,94 mm menghasilkan modulus Young sebesar 212,825166 MPa dan peningkatan  modulus Young komposit CNT/PVA terhadap modulus Young dari PVA sampai 107,30%.
Comparative Study of Various Kinetic Models on Leaching of NCA Cathode Material Soraya Ulfa Muzayanha; Cornelius Satria Yudha; Luthfi Mufidatul Hasanah; Linggar Tungga Gupita; Hendri Widiyandari; Agus Purwanto
Indonesian Journal of Chemistry Vol 20, No 6 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.49412

Abstract

The kinetics study of NCA leaching in the HCl system was proposed. Various kinetic models such as shrinking core, logarithmic rate law, and Avrami equation were used to find out the most appropriate kinetic models for this process. The effect of HCl concentrations, leaching temperatures, solid to liquid (S/L) ratio, and leaching duration were observed. The optimum conditions of NCA leaching were at HCl concentration of 4 M, temperature of 80 °C, S/L ratio of 100 g/L, and leaching time of 1 h. The result shows that shrinking core model with diffusion control process of residue layer describes well the leaching mechanism in this research, which is indicated by the good fitting of coefficient values of correlation (R2) and confirmed by the activation energy values of Ni, Co, Al that were less than 40 kJ/mol.
Identifikasi dan Kuantifikasi Antosianin dari Fraksi Bunga Rosela (Hibiscus Sabdariffa L) dan Pemanfaatannya sebagai Zat Warna Dye-Sensitized Solar Cell (DSSC) Mitha Dea Anggistia; Hendri Widiyandari; Khairul Anam
Jurnal Kimia Sains dan Aplikasi Vol 19, No 2 (2016): Volume 19 Issue 2 Year 2016
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (886.472 KB) | DOI: 10.14710/jksa.19.2.50-57

Abstract

Identifikasi antosianin dari fraksi bunga Rosela (Hibiscus Sabdariffa L.) dan pemanfaatannya sebagai zat warna dye-sensitized solar cell (DSSC) telah dilakukan. Penelitian ini bertujuan untuk mengkuantifikasi kadar antosianin dari fraksi bunga rosela dan menentukan hubungan kadar antosianin terhadap efisiensi sel pada DSSC. Metode yang digunakan adalah (i) ekstraksi antosianin dengan maserasi, (ii) fraksinasi ekstrak antosianin secara kromatografi kolom dengan fasa gerak air-metanol (100:0, 75:25, 50:50, 25:75, 0:100) dan fasa diam sephadex LH-20, (iii) identifikasi senyawa antosianin dengan KLT dan penampak bercak (AlCl3 dan uap amoniak), (iv) kuantifikasi kadar antosianin, (v)  aplikasi zat warna antosianin ke DSSC dan (vi) karakterisasi senyawa antosianin pada fraksi yang memiliki performansi DSSC paling tinggi menggunakan spektroskopi UV-Vis dan IR. Hasil penelitian menunjukan kadar relatif antosianin mempengaruhi nilai efisiensi sel surya DSSC. Semakin besar kadar relatif antosianin maka nilai efisiensi sel surya semakin tinggi. Fraksi 1 menunjukkan nilai kadar relatif antosianin 3,56% dan nilai efisiensi sel surya yaitu 1,014 x 10-4%, sedangkan fraksi 2 menunjukkan nilai kadar relatif antosianin 40,29% dan nilai efisiensi sel surya fraksi 2 yaitu 6,59 x 10-4 %.
Pest Control on Shallots Using Solar-Powered Trap Lights in Srimulyo Village, Sragen Regency Hendri Widiyandari; Yofentina Iriani; Kusumandari Kusumandari; Fahru Nurosyid; Khairuddin Khairuddin; Risa Suryana
ABDIMAS: Jurnal Pengabdian Masyarakat Vol. 6 No. 1 (2023): ABDIMAS UMTAS: Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM Universitas Muhammadiyah Tasikmalaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35568/abdimas.v6i1.2821

Abstract

Shallots one of a leading vegetable commodity in Central Java. However, the shallot farming industry is frequently confronted with the issue of decreasing yields due to the presence of plant pests. Onion plant pests include the butterfly (Spodoptera exigua) and the leafminer fly (liriomyza). There are two approaches to dealing with this pest problem: pesticides/insecticides and light traps. In terms of organic farming methods, the use of light traps is more profitable. However, the operational costs are quite high because farmers must have a generator to generate electricity, diesel fuel to turn on the generator, oil to lubricate the engine, operators, or must connect to the PLN electricity network. So, we used a solar-powered pest trap lamp system with Li-ion batteries as the energy storage medium to solve this problem. In Srimulyo village, Gondang district, Sragen regency, community service activities such as installing pest trap lights to control pests on shallots were carried out. The onion farmer group association is the service activity's partner (Gapoktan). This activity was well received by shallot farmers because the presence of this light trap can reduce pest attacks.
Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity Yayuk Astuti; Prisca Putri Elesta; Didik Setyo Widodo; Hendri Widiyandari; Ratna Balgis
Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 1 Year 2020 (April 2020)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.15.1.5483.104-111

Abstract

Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of  3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Ag-TiO2 for Efficient Methylene Blue Photodegradation Under Visible Light Irradiation Widiyandari, Hendri; Nashir, Muhammad; Parasdila, Hanaiyah; Almas, Khanza Fadhilah; Suryana, Risa
Bulletin of Chemical Reaction Engineering & Catalysis 2023: BCREC Volume 18 Issue 4 Year 2023 (December 2023)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.19885

Abstract

Photocatalysis is one of the environmentally friendly methods for degrading down wastewater contamination. TiO2 as one of the photocatalyst material is claimed can enhance the photocatalytic activity much better, if the band gap energy is reduced. In order to reduce the bandgap energy of TiO2, the novel in this research is that the temperature variations over a 24-hour period at 100 °C, 120 °C, 140 °C, and 160 °C in hydrothermal process to synthesize the photocatalyst material with Ag-doped. Diffraction patterns of Ag-TiO2 show that all sample have tetragonal crystal structure and an anatase phase which also has excellent crystallinity. Some of the nanoparticles on the surface of Ag-TiO2 have a consistent morphology, while other particles are formed irregularly. According to the DRS UV-Vis result, bandgap energy reduced as temperature increased (Eg = 3.2 eV to 2.32 eV). The results from PL Ag-TiO2 160 have the lowest intensity, which indicates a low rate of electron-hole recombination. The Ag-TiO2 160 sample produced the best photocatalytic activity, according to the results of the MB degradation test, with a relative change in concentration of 92.98% for 2 h under visible light. Copyright © 2023 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Co-Authors Adrian Nur Adrian Nur AGUS PURWANTO Agus Purwanto Agus Subagio Agus Supriyanto Ahmas Sudin, Ahmas Alfi Nur Aini Almas, Khanza Fadhilah Anatta Wahyu Budiman Aninda Artatriska Meilana Arif Jumari Arutanti, Osi Budiman, Anatta Wahyu Burhanudin Syam Cornelius Satria Yudha Cornelius Satria Yudha Dewi Ratnasari Dewi, Galuh Anjani Kirana Didik Setyo Widodo DinaPanuntun, Adama Endah Retno Dyartanti Endah Retno Dyartanti, Endah Retno Fahru Nurosyid Fahru Nurosyid Firdaus, Iqbal Her Rekenalita, Imevia Inayati Inayati Jumari, Arif Khairuddin - Khairul Anami Kusumandari Kusumandari Kusumandari, Kusumandari Linggar Tungga Gupita Luthfi Mufidatul Hasanah Luthfi Mufidatul Hasanah Metri Setyaningsih Mitha Dea Anggistia Mohtar Yunianto, Mohtar Muhammad Nashir Musni Ahyani, Musni Mutakin, Ikbalul Nurmala, Dina Siti Nurwijayanti Parasdila, Hanaiyah Pardoyo Pardoyo Parsaoran Siahaan Praptomo, Mokhamad Sahid Prilita, Orien Prisca Putri Elesta Purwanto, Agus Putri, Karini Kayala Putri, Safitri Amalia Ratna Balgis Redemtus Heru Tjahjana Risa Suryana Risa Suryana Septiani, Eka Lutfi Soraya Ulfa Muzayanha Soraya Ulfa Muzayanha Sri Haryanti Tatang Wahyudi, Tatang Tika Paramitha Tika Paramitha Wahyu Setia Budi Yayuk Astuti Yofentina Iriani Yofentina Iriani Zaenul Muhlisin