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RISS 인기검색어
- 검색키워드
- 저자 : Nurhidayatullaili Muhd Julkapli (검색결과 4 건)
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Graphene metal nanocomposites — Recent progress in electrochemical biosensing applications
Ibrahim Khalil,Shahrooz Rahmati,Nurhidayatullaili Muhd Julkapli,Wageeh A. Yehye 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The integration of metal, metal oxides or metal alloy nanostructures with graphene increases the surface area, active sites for binding analytes, conductivity as well as mechanical strength of the biosensor. Graphene-metallic nanocomposites by their synergistic effect exhibit greater sensitivity for the detection of a variety of biomolecules. Herein, this review addresses the most recent progress on the design and fabrication of graphene metallic nano-biointerfaces in electrochemical biosensing, detection of biomolecules ranging from most common analytes to sophisticated molecules with greater sensitivity as well as good selectivity from the real-time sample in presence of common interfering substances.
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Gold-graphene oxide nanohybrids: A review on their chemical catalysis
Muhammad Nur Iman Amir,Ahmed Halilu,Nurhidayatullaili Muhd Julkapli,Azman Ma’amor 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
The discovery of graphene oxide (GO) has motivated enormous applications of gold (Au) nanoparticles(NPs) in catalysis due to its ability to function as a suitable catalyst support material. This reviewdiscussed the routes for AuNPs-GO synthesis such as chemical vapor deposition (CVD), electrochemical,sol-gel and hydrothermal methods as it pertains to chemical synthesis. Accordingly, the CVD approachhas the capability of producing a single layer of well-distributed AuNPs over GO to form a nanohybridframework. Although the common application of AuNPs-GO nanohybrids has been in nanosensors,recent reports showed its aptitude in chemical synthesis through hydrogenation and oxidation reactionsinvolving organic molecules. Therefore, due to the existing attributes of AuNPs catalysis, recommen-dations were suggested to guide its usage in the form of AuNPs-GO nanohybrids as a catalyst for specialtychemical production. This report should inspire future use of AuNPs-GO in the industrial catalyticsynthesis of various pharmaceuticals and energy-based platform organic molecules.
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Mohamad Nurul Azman Mohammad Taib,Wageeh Abdulhadi Yehye,Nurhidayatullaili Muhd Julkapli,Sharifah Bee O. A. Abdul Hamid 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Novel acetylation process by substitution of acetic anhydride substitution with hydroxyl groups on nanocellulose (NCC) has been explored to increase its dispersion and interaction in nitrile butadiene (NBR) matrix. The crystallinity index was increased after modification when compared to unmodified NCC, but no significant different with increases of treatment time from 1 hour to 3 hours treatments proven by X-ray diffraction (XRD) results. The Fourier transform infra-red (FTIR)showed the existent of acetyl groups on surface of the NCC after treatment by existent of the peak 1736 cm-1 that attributed to carbonyl groups some peaks were observed at 1430, 1361 and 1248 cm-1 and confirmed on the acetylation process. The nuclear magnetic resonance (NMR) also show the present of acetyl groups by existent of the signal of proton methyl group at 1.90 ppm and new peaks at 5.42, 4.70 and 4.34 ppm, for all ACN samples. The thermal results by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) showed that the acetylated NCCs were 10 % more thermally stable. Transmission electron microscopic (TEM) results showed that no significant changes were observed due to the acetylation process. The results also showed well distributed of individual NCC after acetylation, this improvement was primarily attributed to uniform dispersion of the ACN-NCC and less aggregated occurred. Due to its hydrophobic characteristics, highly crystalline and nano size, ACN-NCC brought a significant improvement up to 25 % on the mechanical properties of nitrile butadiene (NBR) rubber composites.
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Mohamad Nurul Azman Mohammad Taib,Wageeh A. Yehye,Nurhidayatullaili Muhd Julkapli 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1
Nanocellulose antioxidant (Aox-NCC) was used as reinforcement and crosslinking agent in nitrile butadiene rubber (NBR) composites. The crosslinking density and volume of rubber bonded in the matrix were increased up to 3 phr and no significant improvement between 4 phr and 5 phr was recorded. The interactions of gallic acid and NCC was found to occur between the -OH and -COOH groups, as revealed by Fourier Transform Infra-Red (FTIR) and Nuclear Magnetic Resonance (NMR) analysis. Crystallinity index of Aox-NCC was increased more than 11 %, recorded by X-ray diffraction(XRD) analysis. Meanwhile, the thermal stability of Aox-NCC was increased 30 oC, analyzed by thermogravimetry (TG). With the addition of 3 phr Aox-NCC, tensile strength and modulus at 500 % for NBR composites were increased significantly up to 20 %. There was no significant improvement on modulus at 100 %, modulus at 300 %, elongation at break and tear strength. The degradability of NBR composites within 6 months period was improved significantly at 5 phr of Aox-NCC. Increase in carbonyl group after soil burial test with the existence of cracks, voids and degradable parts of NBRcomposites were revealed. This demonstrated that, Aox-NCC plays a secure function to reinforce NBR composites.
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