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- 저자 : MOHD ZOBIR HUSSEIN (검색결과 4 건)
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SAMER HASAN HUSSEIN-AL-ALI,Palanisamy Arulselvan,Sharida Fakurazi,Maznah Ismail,DENA DORNIANI,MOHD ZOBIR HUSSEIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
Magnetic nanoparticles (MNPs) were prepared by the coprecipitation method using a molar ratioof Fe 3 þ:Fe 2 þof 2:1. The surface of MNP was coated with chitosan (CS) and polyethylene glycol(PEG) to form CS – MNP and PEG – MNP nanoparticles, respectively. Anthranilic acid (AA) wasloaded on the surface of the resulting nanoparticles to form AA – CS – MNP and AA – PEG – MNPnanocomposites, respectively. The nanocomposites obtained were characterized using powderX-ray di®raction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetryanalysis (TGA), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM). XRD results showed that the as-synthesized nanocomposites are pure magnetite. FTIRresults analysis indicated the existence of two polymers on the particle surface of the MNP andthe presence of loaded AA on the surface of CS – MNP and PEG – MNP nanoparticles. Anthranilicacid loading and the release pro¯les of AA – CS – MNP and AA – PEG – MNP nanocompositesshowed that up to 8.8% and 5.5% of the adsorbed drug were released in 670 min and 771 min,respectively. Anthranilic acid release pro¯les followed a pseudo-second-order kinetic controlledprocess. The cytotoxicity of the as-synthesized anthranilic acid nanocomposities were determinedusing MTT assay using murine macrophage RAW 264.7 cells. MTT results showed that thecytotoxic e®ects of AA – CS – MNP were higher than AA – PEG – MNP against the tested cells ascompared to free anthranilic acid. In this manner, this study introduces novel anthranilic acidnanocomposites that can be used on-demand for biomedical applications.
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Nano-Encapsulated n-Nonadecane Using Vinyl Copolymer Shell for Thermal Energy Storage Medium
Tumirah Khadiran,Mohd Zobir Hussein,Zulkarnain Zainal,Rafeadah Rusli 한국고분자학회 2015 Macromolecular Research Vol.23 No.7
This study is focused on the preparation and characterisation of n-nonadecane-vinyl copolymer shell nanocapsules for thermal energy storage medium. The n-nonadecane nanocapsules were prepared by a one-step miniemulsion in situ polymerisation method. n-Nonadecane was used as a core while styrene (St) and methylmethacrylate (MMA) was used as a vinyl copolymer shell. The Fourier transform infrared results confirmed that n-nonadecane nanocapsules were successfully synthesised. Morphological characteristic analysis indicates that these nnonadecane nanocapsules that were prepared using St/MMA (4:1) have a spherical shape and a narrow particle size distribution, with an average diameter of 160±11 nm. The maximum encapsulation ratio for n-nonadecane nanocapsules is 45.8 wt%. The DSC result of pure n-nonadecane and n-nonadecane nanocapsules exhibits two different peaks, which are related to their carbon numbers. The temperature and latent heat of melting and freezing of the n-nonadecane nanocapsules were determined to be 33.1 oC, 76.9 J/g and 30.2 oC, 82.0 J/g, respectively. Moreover, n-nonadecane nanocapsules exhibit good thermal and chemical stability, even after 1000 cycles of a thermal cycling test. Based on all of the results, it can be concluded that the n-nonadecane nanocapsules exhibit better energy storage and have good potential for buildings, textiles or other applications.
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Azlan Kamari,Siti Najiah Mohd Yusoff,Siew Tin Susana Wong,Norjan Yusof,Hidayatulfathi Othman,Mohd Zobir Hussein,Esther Phillip 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
In this study, poly(ε-caprolactone) lipid-core nanocapsules containing cinnamaldehyde were prepared byinterfacial deposition of pre-formed polymer and used for the first time in mosquito-repellent spray formulations on cotton,polyester and tetoron cotton fabrics. The synthesized nanocapsules formulations were characterized by dynamic lightscattering and Fourier transform infrared spectroscopy analyses. The retention of cinnamaldehyde-loaded lipid-corenanocapsules (Cin-LNCs) on cotton and polyester fabrics, before and after washing and heating, was studied using scanningelectron microscopy (SEM) and UV-Vis spectrometry. The repellency effect of fabrics treated with the Cin-LNC formulationagainst mosquitoes was evaluated in the laboratory using the Excito chamber method and in field trials conducted on rubberfarms. The SEM images and UV-Vis spectrometry results suggested that the fabrics treated with the Cin-LNC formulationshowed outstanding resistance to washing and heating. No skin irritation by treated fabrics was recorded in human volunteerswho took part in a 4-hour patch test. The treated fabrics exhibited good mosquito repellency (greater than 96 %) and were stillable to offer around 30 % repellency even after five cycles of washing and heating. The results indicate that the use of poly(ε-caprolactone) lipid-core nanocapsules is a promising technique to improve the fastness and longevity of repellents onfunctional textiles for insect control.
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Isshadiba Faikah Mustafa,Mohd Zobir Hussein,Abu Seman Idris,Nur Rashyeda Ramli,Muskhazli Mustafa,Sharida Fakurazi 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
The endophytic bacterium, Pseudomonas aeruginosa, was successfully encapsulated into calcium carbonate microshells and coated with sodium alginate in combination with two other materials: skim milk and empty fruit bunch (EFB). The presence of bacteria cells was confirmed by a strand-like structure, a biofilm through morphology and elemental analysis. The survivability of microencapsulated bacteria was found to last for 17 months when they were maintained in a storage condition of 4 °C. Different coating materials used exhibited significant differences in the P. aeruginosa survival during the storage time. Their bioactivity against Ganoderma boninense resulted in a percentage inhibition radial growth (PIRG) value of more than 70%, which is better than its counterparts, the free Pseudomonas cells. With promising viability results of × 106 CFU/mL after three-month storage, the results demonstrate that skim milk-coated alginate might be good protection for P. aeruginosa that could sustain the viable bacteria at the target site. This is toward a greener, biological control-based plant protection for Ganoderma diseases in the oil palm planting industry.
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