Article Per Year (5 Year)
p-Index From 2020 - 2025
4.022
P-Index
This Author published in this journals
All Journal Traksi : Majalah Ilmiah Teknik Mesin Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Sains Materi Indonesia SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Widyariset Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Science and Technology Indonesia Majalah Ilmiah Material, Komponen dan Konstruksi Jurnal AUDI Jurnal Rekayasa Material, Manufaktur & Energi Indonesian Journal of Chemistry NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Majalah Ilmiah Pengkajian Industri Metalurgi Jurnal Metalurgi dan Material Indonesia Journal of Engineering and Scientific Research (JESR) Piston: Journal of Technical Engineering Widyariset Teknomekanik Indonesian Journal of Engineering and Science (IJES) Journal of Materials Exploration and Findings (JMEF) Malcom: Indonesian Journal of Machine Learning and Computer Science Metalurgi Jurnal Sains Materi Indonesia Recent in Engineering Science and Technology
Rini Riastuti, Rini
Departemen Teknik Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Transportation

Published : 53 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 53 Documents
Search

 2   3   4   5   6 
Isolation and Characterization of Cellulose Microfibril (MFC) from Gracilaria sp. with Different Quality Grades Nurhayati; Irianto, Hari Eko; Supriyanto, Agus; Kusumawati, Rinta; Basmal, Jamal; Munifah, Ifah; Setiawati, Natalia Prodiana; Kusumaningrum, Wida Banar; Amanda, Putri; Roziafanto, Ahmad Nandang; Riastuti, Rini; Chalid, Muchamad
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.712-724

Abstract

The cellulose found in Gracilaria sp. has not been utilized optimally. This study investigated the characteristics of cellulose and cellulose microfibril (MFC) isolated from three grades of Gracilaria sp. Descriptive tests were performed to determine the quality of eachgrade, including observations on moisture content, ashcontent, CAW,andimpurities. The extraction process involved separating agar from Gracilaria sp., isolating cellulose using 10% NaOH, and bleaching cellulose with 3% NaOCl. The bleached cellulose was then ultrasonicated to produce MFC. Characterization was performed using FTIR, XRD, PSA, STA, DSC, and py-GC/MS. FTIR analysis indicated similar peaks for both cellulose forms but only differed in transmittance intensity. The crystallinity index from XRD analysis was 22–39% for raw Gracilaria sp., 25–46% for cellulose, and 68–89% for MFC. The particle size distribution of MFC mostly ranged between 200–500 nm, with 63.16% frequency. TG analysis showed cellulose decomposition with a Tonset of 231–260oC and a Tmax of 318–326oC. DSC analysis revealed that sonication enhances the polymer structure’s crystallization compared to pre-sonicated cellulose and raw material. The py-GC/MS analysis showed that D-allose and n-Hexadecanoic acid were the major components.
Morphological and Crystallinity Studies of Nanofiber Cellulose Based on Sargassum sp. Using Multistep Preparation Nurhayati, Nurhayati; Irianto, Hari Eko; Chalid, Mochamad; Riastuti, Rini
Indonesian Journal of Chemistry Vol 25, No 4 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.104211

Abstract

This study aims to investigate the crystallinity and morphological characteristics of cellulose nanofibers (CNF) isolated from Sargassum seaweed through a multistep preparation. The isolation was conducted in stages, including alkalinization, bleaching, and mechanical reduction in fiber size. In addition to observing the outcomes at each isolation stage, three mechanical processes were implemented to generate CNF. The observed parameters included fiber morphology analyzed using scanning electron microscopy (SEM) and fiber crystallinity tested using X-ray diffraction (XRD). The results indicated that Sargassum mostly exhibits a type Iα structure of cellulose. The multistep treatment, combined with mechanical processing, resulted in finer fibers and an improved crystallinity index, reaching a maximum value of 70.39%. These findings suggest that cellulose nanofibers from Sargassum have the potential to be used in sustainable biomedical materials.
MENINGKATKAN KEMAMPUAN SAINS MELALUI PERMAINAN WARNA DENGAN MENGGUNAKAN CAT AIR PADA ANAK KELOMPOK B TK NEGERI PEMBINA KABUPATEN TEMANGGUNG Riastuti, Rini
Jurnal AUDI: Jurnal Ilmiah Kajian Ilmu Anak dan Media Informasi PAUD Vol 3 No 2 (2018): Desember
Publisher : UNIVERSITAS SLAMET RIYADI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33061/ad.v3i2.2734

Abstract

Tujuan dari penelitian ini adalah 1) untuk mengetahui pelaksanaan pembelajaran permainan warna dengan menggunakan cat air dalam meningkatkan kemampuan sains anak, 2) untuk mengetahui peningkatan kemampuan sains pada anak setelah kegiatan permainan warna dengan menggunakan cat air di Kelompok B TK Negeri Pembina Kabupaten Temanggung Semester I Tahun Pelajaran 2017/2018. Berdasarkan hasil penelitian dan pembahasan, maka dapat disimpulkan bahwa kemampuan sains anak Kelompok B TK Negeri Pembina Kabupaten Temanggung dari kondisi awal sampai dengan dilaksanakannya perbaikan pembelajaran sampai dengan Siklus II telah mengalami peningkatan yang sangat signifikan.  Pada kondisi awal, anak yang mampu menunjukkan kemampuan sainsnya hanya 3 anak (20%) dari 15 anak. Berdasarkan perbaikan pembelajaran yang diperoleh pada Siklus I, maka dapat dilihat hasil penelitian bahwa anak yang mampu melaksanakan permainan  warna dengan kriteria berkembang sesuai harapan 7 anak (46,7%), mulai berkembang 2 anak (13,3%), dan belum berkembang 6 anak (40%). Setelah diadakan perbaikan pembelajaran pada Siklus II anak yang dianggap mampu dengan kriteria berkembang sesuai harapan 13 anak (86,8%), mulai berkembang 1 anak (6,6%), belum berkembang 1 anak (6,6%) dan telah mencapai standar ketuntasan belajar yang telah ditetapkan dengan kriteria anak tertarik dalam kegiatan bermain warna, anak mampu mencampur warna dengan baik, dan anak mampu menjawab pertanyaan dari peneliti.
Co-Authors Abdullah, Abdul Halim Adam Hidana Yudo Saputro, Adam Hidana Yudo Adi Noer Syahid Adipurnama, Iman Agus Supriyanto Ahmad Fadli Ahmad Fadli Ahmad Maksum Ahmad Zakiyuddin Akhmad Faizal Alfian Alfian Amalia, Dinda Putri Amanda, Putri Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi Amin Suhadi, Amin Andryansah Andryansah Anjar Oktikawati Aqila, Daffa Aulia, Hafiz Ayu Rizeki Ridhowati Ayu Rizeki Ridhowati Azizah Intan Pangesty Bashari R Roszardi Baskoro, Agung budiarto, wahyu Chalid, Muchamad Dedi Priadi Dedi Priadi Dedi Priadi Dedi Supriadi Diana Natalia Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Eka Febriyanti Febi Dwi Antony Febriyanti, Eka febriyanti, eka febriyanti, eka Gadang Priyotomo Gadang Priyotomo Hari Eko Irianto Ifah Munifah Irawan, Januar IRWAN WIJAYA J.W. Soedarsono Jamal Basmal, Jamal Jamhari Jamhari Johny Wahyuadi Soedarsono Kaban, Agus S Kautsar Muwahhid Kautsar Muwahhid Krisnandha Rahardian Kusumaningrum, Wida Banar Manurung, Rizky Rama Putra Mega Herawati Arifiana Amanah Notonegoro, Mega Herawati Arifiana Amanah Mhd. Ibkar Yusran Asfar Mochamad Chalid Muhammad Refai Muslih Muhammad Rifai Muhammad Yunus Najmudin, Muhammad Guruh Nikitasari, Arini Nono Darsono Nono Darsono, Nono Nurhayati Nurhayati Nurhayati Putri Salsabila, Syanatha Rachmat Hermawan Ramadhani, Rizal T Ramadhani, Rizal Tresna Ramdhani, Rizal Tresna Riady, Rado Ridhowati, Ayu Rizeki Ridhowati, Ayu Rizeki Rinta Kusumawati, Rinta Rinush Fedrikdo Paltgor Rizal Tresna Ramdhani Roszardi, Bashari Rohululloh Roziafanto, Ahmad Nandang Santoso, Irwan Wijaya SATRIYAS ILYAS Sunarso Sunarso Syahid, Adi Noer Tiggor, Triadhi Panthun Tri Handayani Tri Hardi Priyanto Wahyu Budiarto Winarto Winarto Yuanto, Nursidi