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All Journal VALENSI CHEMICA Jurnal Teknik Kimia The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Riset Kimia SEMIRATA 2015 Jurnal Kimia dan Kemasan Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Majalah Farmasetika Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Kimia dan Kemasan
Zulhadjri Zulhadjri
Chemistry Department, Andalas University
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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Ekstrak Daun Andalas sebagai Capping Agent dalam Green Hydrothermal Synthesis Nanopartikel Mangan Ferrit dan Aplikasinya sebagai Antibakteri Lusi Puspitasari; Syukri Arief; Zulhadjri Zulhadjri
Chimica et Natura Acta Vol 7, No 1 (2019)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.611 KB) | DOI: 10.24198/cna.v7.n1.19925

Abstract

Pada penelitian ini telah dilakukan sintesis nanopartikel MnFe2O4 secara hidrotermal menggunakan ekstrak daun andalas (M. macroura Miq.)  sebagai capping agent. Penelitian ini bertujuan untuk mengetahui pengaruh pH terhadap bentuk dan ukuran nanopartikel MnFe2O4. MnFe2O4 EN10 dan  MnFe2O4 EN12 disintesis menggunakan ekstrak daun andalas dan NaOH dengan pH masing-masing 10 dan 12, sementara MnFe2O4 N10 dan MnFe2O4 N12 disintesis tanpa menggunakan ekstrak daun andalas hanya dengan penambahan NaOH pada pH 10 dan 12. Hasil analisis X-Ray Diffraction (XRD) menunjukkan karakteristik MnFe2O4 spinel kubik  dengan ukuran kristal 11-16 nm, sedangkan MnFe2O4 E menunjukkan tidak terbentuknya spinel ferrit MnFe2O4 yang terbentuk hanya pengotor yaitu α-Fe2O3. Hasil karakterisasi Scanning Electron Microscopy (SEM) menunjukkan  bahwa morfologi nanopartikel MnFe2O4 berbentuk spheric. Nanopartikel MnFe2O4 diaplikasikan sebagai antibakteri terhadap bakteri S. aureus dan E. coli dengan metode sumur.
Fabrication of Hydrophobic Indonesia Bamboo Modified by Octa Fluoro 1-Pentanol (OFP) Based on TiO2 Thin Film for Self-cleaning Application Diana Vanda Wellia; Arifah Mustaqimah; Wulandari Wulandari; Zulhadjri Zulhadjri; Syukri Syukri; Nurul Pratiwi
The Journal of Pure and Applied Chemistry Research Vol 7, No 2 (2018): Edition May-August 2018
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1423.395 KB) | DOI: 10.21776/ub.jpacr.2018.007.02.396

Abstract

The ultra-hydrophobic surface on Indonesia bamboo timber has been successfully prepared using OFP (2,2,3,3,4,4,5,5-octafluoro-1-pentanol) as a modifier agent. The hydrothermal method has been used to fabricate anatase TiO2 film followed by OFP modification. Maximal water contact angle of 123ο has been obtained for the composition of 10 mL of OFP and 15 mL of 2-propanol (B-T-OFP10). XRD analysis showed the existence of pure anatase TiO2 film on bamboo timber, confirmed by EDS result. SEM image of a TiO2-coated and a typical ultra-hydrophobic bamboo timber revealed irregular aggregates of spherical TiO2 on the surface and compact ultra-hydrophobic  surface, respectively. The optimum sample (B-T-OFP10) showed excellent mechanical stability, self-cleaning property, and flame retardancy compared to pure bamboo timber. 
SINTESIS DAN KARAKTERISASI WOLLASTONIT BERBAHAN DASAR ALAMI DENGAN METODE HIDROTERMAL Rianda -; Zulhadjri -; Syukri Arief
Jurnal Riset Kimia Vol. 8 No. 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.233

Abstract

Indonesia is one of huge paddy producing countries so that it also produces rice husk in a great number. Rice husks contain high silica. Which is good in silica compounds synthesis such as Wollastonit (CaSiO3). Nowadays Wollastonit has attracted great intension doe to its ability to increase mechanical properties of a material. In this work, rice husk was taken from Sariak Laweh, Lima Puluh Kota district and CaO was taken from Halaban, in the same district. Analysis with XRF show that SiO2 and CaO content of both samples were high enough, 97% and 98% which indicated their good potential as silica and calcium source in to synthesize of Wollastonit. Characterization XRD and SEM were found that the Wollastonit obtained which rice husks gave good result.
STUDI HANTARAN LISTRIK SENYAWA SRN+1TINO3N+1 (N = 1 DAN 2) FASA RUDDLESDEN-POPPER YANG DISINTESIS DENGAN METODE LELEHAN GARAM Yulia Eka Putri; Hamsal Yusri; Zulhadjri -
Jurnal Riset Kimia Vol. 8 No. 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.237

Abstract

Srn+1TinO3n+1 (n = 1, 2,...n)Ruddlesden-Popper phase is a metal oxide compound with a layered structure consisting of SrTiO3 perovskite layers and strontium oxide (SrO) layers, thus this material has a potential as termoeletrik compounds that could be developed as an alternative material for renewable energy. In this study, we examine one of the 3 parameters of termoelectric properties, namely the electrical conductivity. Srn+1TinO3n+1 (n = 1 and 2)Ruddlesden-Popper phases were synthesized using molten salt method. The synthesis was carried out at 950 °C for 10 hours with a ratio of precursor and salt were 1: 0.5. Structural analysis by X-Ray Diffractometer (XRD) confirmed that all synthesized compounds formed Srn+1TinO3n+1 (n = 1, and 2) Ruddlesden-Popper phase with the characteristic peaks at 2q = 31o, 32o, and 46o. The morphology analysis by Scanning Electron Microscope (SEM) showed that the particles have plate-shaped with crystallites size were 20 nm. The electrical properties were measured using LCR meter with the highest electrical conductivity of 2.25x10-7 S / cm which showed the semiconductors behaviour.
Sintesis Senyawa Aurivillius Lapis Empat PbBi4Ti4O15 dan PbBi3NdTi4O15 dengan Metode Lelehan Campuran Garam NaCl-KCl dan Karakterisasi Struktur Gita Rachmad Wibowo; Emriadi Emriadi; Zulhadjri Zulhadjri
Jurnal Riset Kimia Vol. 10 No. 2 (2019): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v10i2.307

Abstract

Four-layered Aurivillius phases PbBi4Ti4O15doped with Nd3+ with formula PbBi3NdTi4O15 were synthesized by molten-salt technique using NaCl and KCl (1:1 molar ratio) as the flux. Precursors were weighed stoichiometrycally and grinded with salts mixture in 1:7 ratio (product : salts mixture) until homogenous. The samples were heated at temperature 600oC, 700oC, 800oC, and 900oC for 5 hours for each temperature. The products were characterized by X-ray diffractometer (XRD), Scanning Electron Microscope (SEM) and LCR-meter. XRD data were refined by Rietica program using Le Bail technique. Refinement results showed the best structure as the A21am of space group for both samples. Surface analysis for each samples morphology is the plate-like by SEM characterization. Dielectric constants measured at room temperature show that the sample doped Nd3+ has lower value than sample without containing Nd3+ cation.
Struktur dan Sifat Dielektrik Senyawa Aurivillius CaBi3LaTi4O15 yang Disintesis dengan Teknik Hidrotermal Zulhadjri Zulhadjri; Firmanul Qadri Amir; Marsal Mahmud; Upita Septiani; Syukri Arief
Jurnal Riset Kimia Vol. 11 No. 1 (2020): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i1.343

Abstract

Synthesis of four-layer Aurivillius CaBi3LaTi4O15 has been successfully carried out by hydrothermal technique using NaOH 4 M as mineralizer. The reaction was carried out at 220 °C for 72 h. Crystal structure, morphology, and dielectric properties were analyzed in this study. X-ray diffraction confirmed that the single-phase product was successfully obtained. The refinement result shows the product has orthorhombic crystal structure with space group A21am. The morphology analyzed using SEM shows plate-like grains are observed, which is characteristic of Aurivillius phase. Dielectric curves show peaks at 585 °C which indicate ferroelectric transition temperature.
Sintesis Codoped-Sr2TiO4 Fasa Ruddlesden-Popper dengan Metoda Lelehan Garam dan Sifat Hantaran Listriknya Elan Mulia; Ayu Sabrina; Dila Kartika Aprianti; Nova Andriani; Zulhadjri Zulhadjri; Yulia Eka Putri
Jurnal Riset Kimia Vol. 11 No. 2 (2020): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i2.358

Abstract

In this research, undoped-Sr2TiO4 and codoped-Sr2TiO4 Ruddlesden-Popper (RP) phase compounds have been synthesized with mole variations of Sr:Ti and dopants. Double substitution with Sm3+ for Sr2+ sites and Nb5+ for Ti4+ sites forming Sr2-xSmxTi1-yNbyO4 (x = 0.0125; 0.025; 0.05; 0.1 and y = 0.0125) aimed to increase the number of electrons carrier, so that the electrical conductivity enhanced. The XRD patterns showed that the highest purity of prepared Sr2TiO4 RP phase sample was obtained at the mole ratio of Sr:Ti of 2:1 with specific peaks at 2θ: 31.35°, 46.73°, and 57.33°. Then, this mole ratio was used to prepare the codoped-samples, and the XRD patterns showed the Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample has the highest purity. SEM images showed that the undoped-Sr2TiO4 and codoped-Sr2TiO4 samples have a plate-like particles with micrometer size. The electrical conductivity of Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample was measured to be a 17-fold increase compared to that of undoped-Sr2TiO4 sample. 
Struktur, Sifat Dielektrik dan Optik Senyawa Aurivillius (Ca0,5Ba0,5)Bi4Ti4O15 yang Disintesis dengan Teknik Lelehan Garam Silvi Veronita; Upita Septiani; Zulhadjri Zulhadjri
Jurnal Riset Kimia Vol. 13 No. 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.463

Abstract

Synthesis of ferroelectric material based onAurivillius phases, (Ca0.5Ba0.5)Bi4Ti4O15 (CBBT), have been done using a molten salts technique.The results of X-ray diffraction (XRD) analysis showed the characteristic peaks at 2θ = 12.93°, 17.31°, 21.64°, 23.23°, 27.71°, 30.33°, and 32.90° which was correspond to the four-layers of Aurivillius phase.Refinement structure using the Le Bail method, the sample is suitable for orthorhombic structures with the A21am space group. The orthorhombicity of the CBBT is small and nearer to tetragonal symmetry.Fourier Transform Infra-red (FTIR) spectra show distortion of TiO6 octahedral at 847 cm-1 and strain vibrations of TiO6 octahedra at 545 cm-1 due to A-O bonds.Analysis using Scanning Electron Microscopy (SEM) shows the morphology of the sample in the form of plate-like which is characteristic of Aurivillius phase.The ferroelectric to paraelectric phase transition temperature (Tc) was obtained at 635ºC.The band gap value of the CBBT compound was 3.17 eV, relatively the same with the CaBi4Ti4O15 (CBT) compound.
Pendekatan Green Synthesis Nanopartikel CuFe2O4 Dengan Bantuan Ekstrak Daun Gambir Dan Sifat Anti Bakterinya Suci Auliya Rahmi Elsya; Zulhadjri Zulhadjri; Syukri Arief
Jurnal Kimia dan Kemasan Vol. 41 No. 2 Oktober 2019
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (380.45 KB) | DOI: 10.24817/jkk.v41i2.5417

Abstract

Perkembangan nanoteknologi berkaitan dengan nanomaterial berfungsi untuk meningkatkan kemampuan antibakteri serta mengurangi jumlah pemakaian logam. Penelitian ini bertujuan untuk mengetahui pengaruh suhu, pH dan waktu sintesis hidrotermal terhadap karakteristik nanopartikel tembaga ferit (CuFe2O4­) yang selanjutnya diaplikasikan sebagai antibakteri. Nanopartikel tembaga ferit (NTF) telah disintesis dengan memadukan metode green sintesis dan hidrotermal. Ekstrak daun gambir (Uncaria gambir Roxb) digunakan sebagai capping agent dalam penelitian ini. Hasil analisis XRD memberikan informasi bahwa NTFyang disintesis dengan penambahan ekstrak daun gambir dan NaOH serta dengan penambahan NaOH saja pH 12 suhu 180˚C selama 8 jam berfase kubik. NTF yang disintesis dengan penambahan ekstrak daun gambir dan NaOH pH 12 suhu 180˚C selama 8 jam memiliki ukuran paling kecil yaitu 24nm. Dari hasil fotograf SEM diketahui NTF yang disintesis pada suhu 180˚C selama 8 jam pH 12 berbentuk spheric dan masih ada yang teraglomerasi. Nanopartikel tembaga ferit yang disintesis diaplikasikan pada bakteri gram positif (S.aureus) dan gram negatif (E.coli) menggunakan metode difusi sumuran. NTF yang disintesis pada suhu 180˚C selama 8 jam pH 10 dan 12 efektif menghambat pertumbuhan bakteri E. coli dan S. aureus.
Five Layers Aurivillius Phases Pb2-xBi4+xTi5-xMnxO18: Synthesis, Structure, Relaxor Ferroelectric and Magnetic Properties Zulhadjri Zulhadjri; B. Prijamboedi; A. A. Nugroho; N. Mufti; Ismunandar Ismu
Journal of Mathematical and Fundamental Sciences Vol. 43 No. 2 (2011)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2011.43.2.6

Abstract

Synthesis of five layers Aurivillius phases, Pb2-xBi4+xTi5-xMnxO18 (0 "žT x "žT 1) were carried out by molten salts method using eutectic mixture of Na2SO4/K2SO4 salts (1:1 molar ratio) as the flux. The samples were characterized by X-ray diffraction powder and refined by Le Bail technique. The refinement results revealed that the samples with composition x = 0, 0.2, 0.4, and 0.6 formed five layers Aurivillius with the space group B2cb; however, the samples with x = 0.4 and 0.6 contained impurity as BiMnO3 and the additional phase of four layers Aurivillius (PbBi4Ti4O15) was also observed for x = 0.6. The samples with x = 0.8 and 1 resulted in two phases: four layers Aurivillius and BiMnO3. The dielectric properties of the Pb2-xBi4+xTi5-xMnxO18 show broad peaks with the temperature of the maximum of the dielectric constant (Tm) at temperature of 295, 295, 304, and 343"žaC at a frequency of 2 MHz for x = 0, 0.2, 0.4, and 0.6, respectively. The Tm of these samples is shift to the left with decreasing frequency as indication of relaxor ferroelectric behavior. The samples with x = 0.8 and 1 show anomaly at 514"žaC and 551"žaC which correspond to the transition phase of four layers Aurivillius. Magnetic properties for all samples containing Mn are paramagnetic.
Co-Authors -, Rianda A. A. Nugroho Admin Alif Agtata, Shazvelia Dwi Amelia Amir Amir, Firmanul Qadri Andriani, Nova Anggreini, Sri Aprianti, Dila Kartika Arifah Mustaqimah Aulia Arivin Billah Ayu Sabrina B. Prijamboedi Dila Kartika Aprianti Elan Mulia Ellyta Sari Emriadi - Erizal Zaini Evi Adhelina Firmanul Qadri Amir Gita Rachmad Wibowo Hamsal Yusri Hermansyah Aziz Hermansyah, Tommy Ida Ayu Putu Sri Widnyani Indrawati Indrawati Ismunandar Ismu Luh Putu Ratna Sundari Lusi Puspitasari Mahmud, Marsal Mai Efdi Marniati Salim Marsal Mahmud Matlal Fajri Alif Mulia, Elan N. Mufti Nova Andriani Nurul Pratiwi Nurul Pratiwi Olly Norita Tetra Olyy Norita Tetra Rahmayeni Ramadhani, Umi Reni Desmiarti Rianda - Rianda Rizal Riga Oktry Silpa Rini Ramadhani Rosadi, Maulana Yusup Sabrina, Ayu Sestry Misfadhila Silvi Veronita Solly Aryza Suci Auliya Rahmi Elsya Syukri Arief Syukri Syukri Upita Septiani Upita Septiani Veronita, Silvi Wellia, Diana Vanda Wibowo, Gita Rachmad Wulandari Wulandari Yeni Stiadi Yessi Rahmayani Yestria Rilda Yulia Eka Putri, Yulia Eka Yulizar Yusuf Yusri, Hamsal