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SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN,ABDUL LATIF AHMAD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.6
New ex situ polyaniline (PANI)/MnO2-filled multiwalled carbon nanotubes (MWCNTs) nanocomposites using para-hydroxybenzene sulfonic acid (PHBSA) as a dopant and linker exhibit enhanced electrical conductivity and interfacial interaction. Strong and enhanced interfacial interaction was observed on the surfaces of the filled carbon nanotubes and PANI. Transmission electron microscope (TEM) demonstrated clearly the improved bonding at the interface compared to the nanocomposite without PHBSA.
STRUCTURAL AND INTERACTION PROPERTIES OF ENCAPSULATED MnO_2 NANOWIRES FILLED MWCNTs
SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.5
Uniform encapsulated MnO_2 nanowires were achieved within the cavity of multiwalled carbon nanotubes (MWCNTs). The Raman spectra revealed a charge-transfer shifts between the MnO_2 particles and the inner tube of MWCNTs. Thin, uniform and continuous MnO_2 was observed with a diameter of 9 nm.
SAIFUL IZWAN ABD RAZAK,WAN AIZAN WAN ABDUL RAHMAN,MOHD YAZID YAHYA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
This paper reports the preparation and characterization of nanocomposites consisting of epoxy resin (EP) and conducting polyaniline nanowires doped with formic acid (PANI-FA). The percolation threshold of this nanocomposites was obtained at 8 wt.% of PANI-FA loading. On the other hand, 8 wt.% of PANI-FA resulted in reduction of tensile and °exural modulus up to 30%and 16%, respectively. The fracture morphological analysis revealed a distinct PANI-FA domain on the EP matrix after the percolation threshold has been reached. Using the scaling law of the percolation theory, it was found that the conductivity of the nanocomposites exhibited an exponential factor, (t) of 0.417.
SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN,ABDUL LATIF AHMAD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.1
This paper reports the synthesis and characterization of ternary nanocomposites consisting of polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs) and manganese dioxide (MnO_2) at different MWCNT–MnO2 loadings. The composite electrical percolation threshold is investigated as well. The in situ nanocomposites were characterized by UV-visible, Fourier transform and Raman spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, and electrical conductivity measurements. The conductivity of the nanocomposite reached up to 78.79 Scm^(-1) with 50 wt.% addition of MWCNT–MnO_2 with good conduction stability and reversibility. The percolation threshold of this nanocomposite was achieved at 0.5 wt.%. Using the scaling law of the percolation theory, it was found that the theoretical conductivity of the nanocomposite exhibited an exponential factor, (t) of 1.38 instead of the universal t value of 2.
Choi Yee Foong,Mohd Syahir Anwar Hamzah,SAIFUL IZWAN ABD RAZAK,Syafiqah Saidin,Nadirul Hasraf Mat Nayan 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
Dry bacterial cellulose nanofiber (BC) sheet coated with poly(lactic acid) (PLA) was developed and characterized towards acute wound healing applications. This new approach of PLA coating on BC revealed enhanced physical and antibacterial properties. Commercial BC sheets originated from the manufacturing of nata de coco jelly were dried and coated with the PLA at various concentrations of 2, 4, 6, 8, 10 and 12 % w/v for the purpose of improving the mechanical properties and followed by loading of antiseptic such as benzalkonium chloride (BAC). PLA has been proposed for the use of coating materials at a concentration of 8 %, the biocomposite sheet started exhibiting a low moisture uptake, prolonged swelling in simulated wound fluid solution and high tear (9.17 Nm2/kg) and burst indices (32.5 kPa·m2/g). The 8 % PLA coating revealed porous fiber-like morphology as observed under scanning electron microscope. Therapeutic loading capacity of the BC/8 PLA was substantially higher than the pristine BC. Furthermore strong antimicrobial activities against Staphylococcus aureaus and Escherichia coli were observed for the BC/8PLA biocomposite film. These reports were clearly suggestive of the fact that synthetic biodegradable polymers, such as PLA, may be exploited for the synergistic combination with BC for antimicrobial and acute wound management. This new and modified fiber source material could reduce the dependency on plant based cellulose for more demanding biomedical applications such as wound healing materials, vascular graft, cartilage replacement, drug delivery and tissue engineering.
Transdermal Delivery of Crocin Using Bacterial Nanocellulose Membrane
Mustapha Abba,Zaharah Ibrahim,Chun Shiong Chong,Nurliyana Ahmad Zawawi,Mohammed Rafiq Abdul Kadir,Abdul Halim Mohd Yusof,SAIFUL IZWAN ABD RAZAK 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10
This work reports the inclusion of crocin (an active agent of saffron) into bacterial nanocellulose (BNC) membranefor transdermal drug delivery. The BNC showed good uptake of the crocin based on the swelling studies and vibrationalpeaks of the FTIR spectra. Surface morphology of the crocin loaded BNC showed that the fibrous nano feature was still intactwith no fiber damages. The crocin release via direct dissolution showed typical burst release. Franz diffusion test revealedstable and prolong drug permeation. Partition coefficient of the BNC-crocin via mice epidermal skin diffusion was found tobe 2.44×10-4 cm-2 min-1 with the average mass flux of 0.53 cm-2 min-1. This facile method of utilizing BNC for the carrier ofcrocin can be useful for administrating other water soluble active compound. Thus BNC opens up choices for the delivery ofcrocin for medicinal purposes.