Ahmad Anas Nagoor Gunny
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Preferred name
Ahmad Anas Nagoor Gunny
Official Name
Ahmad Anas, Nagoor Gunny
Alternative Name
Nagoor Gunny, Ahmad Anas
Gunny, A. A.N.
Nagoor Gunny, A. A.
Ahmad Anas, N. G.
Gunny, Ahmad Anas Nagoor
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Scopus Author ID
55940833700
Researcher ID
AFF-6251-2022

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  • Publication
    Cellulose nanocrystals from bleached rice straw pulp: acidic deep eutectic solvent versus sulphuric acid hydrolyses
    ( 2021-07-01)
    Lim W.L.
    ;
    Ahmad Anas Nagoor Gunny
    ;
    Kasim F.H.
    ;
    Subash Chandra Bose Gopinath
    ;
    Nor Helya Iman Kamaludin
    ;
    Arbain D.
    The present work aims to investigate the feasibility of oxalic acid-choline chloride deep eutectic solvent (OA-ChCl DES), which serves as a promising green solvent that utilized in the acidic deep eutectic solvent (DES) hydrolysis. Oxalic acid-choline chloride DES cellulose nanocrystal (OA-ChCl DES CNC) was isolated from the bleached DES treated pulp (BP) through the acidic DES hydrolysis using 1:1 molar ratio of OA-ChCl DES. The functional groups, crystallinity index, morphological structure, particle size, zeta potential, thermal stability and surface chemistry of the OA-ChCl DES CNC were compared with the sulphuric acid cellulose nanocrystal (SA-CNC) that prepared via sulphuric acid hydrolysis. The findings revealed the presence of negatively charged carboxyl groups on OA-ChCl DES CNC surface after the acidic DES hydrolysis. The physicochemical analyses verified that the OA-ChCl DES CNC was in nano-sized range with polydispersity index (PdI) of 0.56, indicating slightly monodispersed nanoparticles. A stable OA-ChCl DES CNC colloidal suspension with zeta potential value of −52.1 ± 5.2 mV was obtained. The OA-ChCl DES CNC outweighed the SA-CNC in term of thermal stability (288 °C) despite having a slightly lower crystallinity index (76.7%). In fact, the OA-ChCl DES CNC with a yield of 55.1% was achieved through the acidic DES hydrolysis, suggesting that the OA-ChCl DES was capable of promoting efficient cleavage of strong hydrogen bonds in BP. Graphic abstract: [Figure not available: see fulltext.]
  • Publication
    Cellulose nanocrystal production from bleached rice straw pulp by combined alkaline and acidic deep eutectic solvents treatment: optimization by response surface methodology
    ( 2022-07-01)
    Lim W.L.
    ;
    Ahmad Anas Nagoor Gunny
    ;
    Farizul Hafiz Kasim
    ;
    Subash Chandra Bose Gopinath
    The present study aims to develop a statistical model utilizing the response surface methodology (RSM) to investigate the performance of oxalic acid-choline chloride deep eutectic solvent (OA-ChCl DES) in hydrolyzing amorphous domain of the bleached rice straw pulp (BP), while liberating the oxalic acid-choline chloride DES cellulose nanocrystal (OA-ChCl DES CNC). The process parameters, including temperature, reaction time, and BP to OA-ChCl DES mass ratio, were optimized through the RSM coupled with the face-centered central composite design (FCCCD). The mathematical models were generated, while the analysis of variance (ANOVA) was conducted to determine the most significant factors influencing the response which was measured in terms of yield. The findings revealed that the OA-ChCl DES CNC yield as high as 55.08% was attained under the acidic DES hydrolysis conditions of 79.5 Â°C, 4 h, and 1:12.64 mass ratio. This regression model enables researchers to predict the OA-ChCl DES CNC yield with respect to the influencing parameters as well as providing an insight for further scale-up process.