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All Journal VALENSI Jurnal Natur Indonesia Jurnal Matematika & Sains Jurnal Fisika Unand Jurnal Riset Kimia Majalah Kulit, Karet, dan Plastik Journal of Aceh Physics Society ODONTO Dental Journal EduChemia: Jurnal Kimia dan Pendidikan Jurnal Litbang Industri CHEMPUBLISH JOURNAL ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry Jurnal Ilmu Fisika Jurnal Riset Teknologi Pencegahan Pencemaran Industri Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Hydrogen: Jurnal Kependidikan Kimia REACTOR : Journal of Research On Chemistry And Engineering AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Litbang Industri Andalas Dental Journal Journal of Applied Agricultural Science and Technology SAINTI: Majalah Ilmiah Teknologi Industri Aceh International Journal of Science and Technology Jurnal Katalisator Odonto dental journal Jurnal Penelitian Kehutanan Wallacea Journal of The Indonesian Society of Integrated Chemistry Jurnal Kimia Unand
Emriadi -
Chemistry Department Faculty Of Mathematics And Natural Sciences Universitas Andalas
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik Zulhadjri Zulhadjri; Rini Ramadhani; Aulia Arivin Billah; Syukri Arief; Emriadi Emriadi
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.14476.143-151

Abstract

Sintesis senyawa feroelektrik yang berbasis fasa Aurivillius berlapis empat (n = 4) yang didadah kation La3+ dan Mn3+, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 dengan x = 0, 0,2, 0,4, 0,6, 0,8, dan1 telah dilakukan dengan teknik lelehan garam. Karakterisasi produk dengan difraksi sinar-X (XRD) menunjukkan bahwa fasa tunggal Aurivillius ditunjukkan oleh sampel dengan x = 0, 0,2, 0,4, dan 0,6. Refinement struktur dengan teknik Le Bail diketahui bahwa senyawa Aurivillius yang terbentuk sesuai dengan simetri ortorombik dan grup ruang A21am. Analisis dengan Scanning Electron Microscopy (SEM) untuk semua sampel memperlihatkan morfologi sampel berupa lempengan yang merupakan ciri khas senyawa Aurivillius. Nilai konstanta dielektrik sampel dan konduktivitasnya mengalami kenaikan dengan meningkatnya x. Konduktivitas paling tinggi dimiliki oleh sampel x = 0,2 yang diperkirakan akibat adanya interaksi pertukaran ganda (double exchange) antara Mn3+ dan Mn4+.Synthesis of Aurivillius Compounds Ca1-xBi3,5 + xLa0,5Ti4-xMnxO15: Structure and Dielectric Properties. Synthesis of ferroelectric compounds based on a four-phase Aurivillius phase (n = 4) which is doped with La3+ and Mn3+ cations, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 with x = 0, 0.2, 0.4, 0.6, 0 , 8, and 1 were carried out by molten salts technique. Characterization of products using X-ray diffraction (XRD) revealed that the single phase Aurivillius was shown by the samples with x = 0, 0,2, 0,4, and 0,6. The results of refinement show that the Aurivillius phase formed has orthorhombic symmetry with A21am space group. Morphology analysis by scanning electron microscopy (SEM) for all samples shows the plate-like as the characteristic of Aurivillius compounds. The value of dielectric constant and conductivity of the samples increases as increase of x. The conductivity of x = 0.2 is the highest predicted due to the interaction of double exchange between Mn3+ and Mn4+.
Studi komputasi terhadap struktur, sifat antioksidan, toksisitas dan skor obat dari scopoletin dan turunannya Wulandari, Annisa; Afrizal, Afrizal; Emriadi, Emriadi; Efdi, Mai; Imelda, Imelda
Chempublish Journal Vol. 5 No. 1 (2020): Chempublish Journal
Publisher : Department of Chemistry, Faculty of Science and Technology Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/chp.v5i1.9023

Abstract

Studi komputasi pada struktur, sifat antioksidan dari scopoletin dan turunannya telah dipelajari melalui analisis DFT/B3LYP/6-31G dalam fase gas. Analisis toksisitas dengan OSIRIS Property Explorer online telah menunjukkan bahwa scopoletin dan turunannya tidak bersifat mutagenik, tidak menyebabkan tumor dan iritasi, akan tetapi beberapa diantaranya memiliki resiko tinggi terhadap sistem reproduksi. Scopoletin dan turunannya memiliki skor obat berkisar antara 0,270 - 0,503 yang menunjukkan bahwa senyawa tersebut memiliki kemiripan obat yang sebanding dengan obat yang ada. Sifat antioksidan scopoletin dan turunannya dapat dijelaskan dengan baik oleh mekanisme transfer atom hidrogen (TAH) dengan nilai BDE berkisar antara 69,986 - 90,510 Kkal/mol dalam fase gas. Nilai BDE sangat dipengaruhi oleh sifat substituen dan ditemukan bahwa substituen pendorong elektron menurunkan nilai BDE. Nilai BDE menurun dengan urutan dari senyawa 9>6>7>8> scopoletin >1>10>3>5>4>2 dalam fase gas, sehingga urutan kemampuan mendonasikan atom hidrogen adalah 2>4>5>3>10>1> scopoletin >8>7>6 >9. Nilai ΔBDE dari scopoletin dan turunannya pada fase gas berkisar dari -16,064 hingga 4,460 Kkal/mol. Nilai BDE fase gas yang dihitung secara signifikan lebih rendah daripada nilai SET-PT dan PA pada fase gas. Hasil ini lebih lanjut menunjukkan bahwa TAH secara termodinamika lebih disukai daripada SET-PT, PA dan ETE dalam fase gas.
Utilizationof Rice Husk-derived Microsilica as a Reinforcing Agent in MOCAF Starch-based Bioplastics: Enhancing Mechanical Strength, Barrier Properties and Thermal Stability Ruri Wijayanti; Emriadi Emriadi; Anwar Kasim; Nalwida Rozen
Journal of Applied Agricultural Science and Technology Vol. 10 No. 3 (2026): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v10i3.581

Abstract

Starch-based bioplastics are increasingly recognized as eco-friendly substitutes for conventional synthetic plastics owing to their renewable origins and biodegradability. However, their poor mechanical properties and high affinity for water limit their practical applications. In this study, microsilica derived from rice husks was incorporated as a reinforcing agent to enhance the performance of bioplastics based on a modified cassava flour (MOCAF) starch matrix. This study aimed to determine the characteristics of bioplastics with a MOCAF starch matrix and microsilica added at various concentrations. Bioplastics were prepared with the solution casting method involving starch extraction, gelatinization, addition of microsilica at varying concentrations (0%, 1%, 2%, 3%, 4% and 5%), incorporation of a plasticizer (glycerol) and subsequent molding. The results demonstrated that microsilica addition significantly affected the physicochemical properties of the bioplastics. Tensile strength increased with microsilica content, reaching a maximum of 3.73 MPa at 5 wt%, followed by decreases at higher concentrations. Conversely, elongation at break decreased with increasing microsilica content, indicating reduced flexibility. Water absorption also decreased, indicating increased water resistance in the bioplastics. Fourier Transform Infrared (FTIR) analysis confirmed the interaction between microsilica and the starch matrix, while thermogravimetric analysis (TGA) revealed increased thermal stability after the addition of microsilica. Overall, the incorporation of microsilica effectively improved the mechanical, thermal and barrier properties of the MOCAF-based bioplastics, highlighting their potential for developing more durable and environmentally friendly materials.
Co-Authors A, Hermansyah AA Sudharmawan, AA Ade saputra Ade Saputra Adlis Santoni Admin Alif Admin Alif Admin Alif Admin Alif Afdhal Muttaqin Afrizal Afrizal Ahmad Darmawi Alfi Asben Alif, Admin Amelia Amir Anwar Kasim Anwar Kasim Arianti, Yuliana Athiyya Husna Aulia Arivin Billah Aura, Selfi Monica Azimatur Rahmi Bambang Ristiono Bustanul Arifin BUSTANUL ARIFIN Delfi Silvia Della Rosalynna S. Deswati Deswati DIAN LESTARI Dwi Ningsih Ostari Eli Susanti Eni Rahmi Fajarandi, Nabiel Fauzia, Syiffa Fitria Ramadhani G Gunawarman, G Gita Rachmad Wibowo Gusniardi, Vira Anggita Hemansyah Aziz Hermansyah A Hermansyah Aziz Hilda Sartika I Imelda Ibnu Irawan Ida Ayu Putu Sri Widnyani Imelda Imelda Imelda Imelda Indah Wulandari Islami, Dini Muthi'ah Joni, Rahma Kazuhiro Manseki Khalishah, Salwa Kodir, Ade Ismail Abdul Kosno Supriyanto Lidia Gusfi Marni Mai Efdi Mai Efdi Maria Erna Maria Erna Maria Erna Kustyawati Marliani, Indah Tika Marniati Salim Maryam, Maryam Matlal Fajri Alif Mohd Jain Noordin Murniwati Murniwati Nabiel Fajarandi Nalwida Rozen Netri Elisma Novelina Novesar Jamarun Novesar Jamarun Nurul Trinanda Rizal Olly Norita Tetra Pradiwi, Nailatul Zahrah Putri Arwanda Putri Ramadhani Putri Ramadhani, Putri Putri Syifa Sabrina Putri Yolanda Putri, Sanaq Elfira Rahmayeni Rahmiana Zein Redha Fauzana Refinel - Rini Ramadhani Ruri Wijayanti Ruri Wijayanti S Syukri Safni Safni Sanaq Elfira Putri Sari Wahyuni Sartika, Hilda Savira Nurul Hayuni Silvia, Delfi Sri Handani Sri Mutiar Sri Mutiar Sri Wildani Suryati Suryati Suryati Suryati Suryati Susanti, Eli Syiffa Fauzia Syukri - Syukri Arief Syukri Arief Syukri Syukri Takashi Sugiura Vira Anggita Gusniardi Wellia, Diana Vanda Wibowo, Gita Rachmad Wildani, Sri Wulandari Wulandari Wulandari, Annisa Yeni Stiadi Yetria Rilda Yola Azli Perdana Yuli Yetri Yuliana Arianti Yulizar Yusuf Yulizar Yusuf Zilfa Zilfa Zulhadjri Zulhadjri