Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Mahyuni Harahap"'
Autor:
Aniza Salviana Prayugo, Marpongahtun, Saharman Gea, Amru Daulay, Mahyuni Harahap, Jonathan Siow, Ronn Goei, Alfred Iing Yoong Tok
Publikováno v:
Biosensors and Bioelectronics: X, Vol 14, Iss , Pp 100363- (2023)
A facile synthesis method involving a one-step solvothermal method is demonstrated in producing fluorescent nitrogen-doped carbon dots (N-CDs) by employing biomass waste (Jengkol peels) and ethylenediamine as a source for carbon and nitrogen. The syn
Externí odkaz:
https://doaj.org/article/f3f2d5039bef4257b3267f290a6c5969
Autor:
Vivi Purwandari, Martha Rianna, Marpongahtun, Isnaeni Isnaeni, Yiming Zou, Mahyuni Harahap, Gratianus Halawa, Ronn Goei, Alfred Iing Yoong Tok
Publikováno v:
Materials Science for Energy Technologies, Vol 6, Iss , Pp 282-289 (2023)
The synthesis of graphene nanosheets (GNs) from sub-bituminous coal aims to increase the added value of coal in a cheap, easy and proclaimed this method on an industrial scale. The addition of biocatalyst (BFS) in the pyrolysis process can reduce the
Externí odkaz:
https://doaj.org/article/ed9144fc8d934140965856feca28e15d
Publikováno v:
International Journal of Technology, Vol 14, Iss 1, Pp 152-161 (2023)
This work isolated nanofiber cellulose (NFC) and Lignin from oil palm empty fruit bunches (OPEFB). NFC/lignin-based carbon fiber was prepared by using the wet-spinning technique and followed by pyrolysis at 500°C. Lignin isolated from OPEFB was c
Externí odkaz:
https://doaj.org/article/2b27289295f142b194e2de6ba5bdf5f8
Autor:
Grace Nainggolan, Saharman Gea, Marpongahtun, Mahyuni Harahap, Dellyansyah, Suhut Alexander Situmorang
Publikováno v:
Journal of Natural Fibers, Vol 20, Iss 1 (2023)
In recent years, the development of air filter materials that are cheap, abundantly available in nature, environmentally friendly, and easy to process has attracted the attention of researchers. The current study produced lignin/PEO nanofiber using e
Externí odkaz:
https://doaj.org/article/0215e6b33c7c463d97b491adc500e451
Autor:
Mahyuni Harahap, Yurika Almanda Perangin-Angin, Vivi Purwandari, Ronn Goei, Alfred ling Yoong Tok, Saharman Gea
Publikováno v:
Heliyon, Vol 9, Iss 3, Pp e14556- (2023)
The electrospinning of acetylated lignin/polyvinyl alcohol (PVA) nanofibres was carried out to expand the application of lignin materials obtained from oil palm empty fruit bunches (OPEFB). Lignin was isolated by the steam explosion method and subseq
Externí odkaz:
https://doaj.org/article/a9fef83d7ace45d6aebf2937a48f88f7
Autor:
Amir Hamzah Siregar, Aditia Warman, Mahyuni Harahap, Grace Nainggolan, Dellyansyah Dellyansyah, Saharman Gea
Publikováno v:
Indonesian Journal of Chemistry, Vol 21, Iss 6, Pp 1463-1470 (2021)
A polyvinyl alcohol (PVOH)/lignin nanofiber was prepared by the electrospinning method as a precursor for biodegradable and low-cost carbon fibers. PVOH 15% was dissolved in water, and various concentration of lignin (5, 10, 15, 20, and 25%) was adde
Externí odkaz:
https://doaj.org/article/0a0f05ea7c1442b89ed7810d086953a2
Autor:
Rufina Pramudita, Marpongahtun, Saharman Gea, Amru Daulay, Mahyuni Harahap, Yong Zen Tan, Ronn Goei, Alfred Iing Yoong Tok
Publikováno v:
Case Studies in Chemical and Environmental Engineering, Vol 6, Iss , Pp 100277- (2022)
Green luminescent water-soluble citric acid-carbon dots composite were synthesized from empty fruit bunches (EFB) biochar. The hydrothermal method solves the weakness of the difficult size to control and the large energy. The hydrothermal method has
Externí odkaz:
https://doaj.org/article/3bf84ff038bd4b44a5e40353aa37ed71
Autor:
Poppy Anjelisa Zaitun Hasibuan, Yuandani, Masitta Tanjung, Saharman Gea, Khatarina Meldawati Pasaribu, Mahyuni Harahap, Yurika Almanda Perangin-Angin, Andre Prayoga, Junius Gian Ginting
Publikováno v:
Heliyon, Vol 7, Iss 10, Pp e08197- (2021)
Cellulose nanofibers (CNFs), chitosan, and silver nanoparticles (AgNPs) are widely used to enhance the active functions and antibacterial properties of wound dressings. This study was conducted to prepare CNF/AgNP-chitosan using a straight incorporat
Externí odkaz:
https://doaj.org/article/7882199e00694e1a9e720c6ac8d77ac4
Autor:
Saharman Gea, Amir Hamzah Siregar, Emma Zaidar, Mahyuni Harahap, Denny Pratama Indrawan, Yurika Almanda Perangin-Angin
Publikováno v:
Materials, Vol 13, Iss 10, p 2290 (2020)
A study on isolation and characterisation of cellulose nanofibre (CNF) and lignin was conducted to expand the application of CNF and lignin from oil palm biomass. CNF was extracted by steam explosion and the by-product was precipitated to obtain lign
Externí odkaz:
https://doaj.org/article/20f3d2a5074542089d6bae1c0c894303
Autor:
Dinda Gusti Ayu, Saharman Gea, null Andriayani, Dewi Junita Telaumbanua, Averroes Fazlur Rahman Piliang, Mahyuni Harahap, Zhihao Yen, Ronn Goei, Alfred Iing Yoong Tok
Publikováno v:
ACS Omega. 8:14965-14984