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- 저자 : Fathilah Ali (검색결과 3 건)
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Size-Controlled Polymer-Coated Nanoparticles as Efficient Compatibilizers for Polymer Blends
Kwon, Taegyun,Kim, Taesu,Ali, Fathilah binti,Kang, Dong Jin,Yoo, Misang,Bang, Joona,Lee, Wonbo,Kim, Bumjoon J. American Chemical Society 2011 Macromolecules Vol.44 No.24
<P>Polymer-coated gold nanoparticles (Au NPs) with controlled size and surface chemistry were successfully synthesized and applied to tailor the structures and properties of polytriphenylamine (PTPA) and polystyrene (PS) blends. Two different polymer-coated Au NPs with sizes of 5.9 nm (Au NP-1) and 20.7 nm (Au NP-2) were designed to be thermally stable above 200 °C and neutral to both PS and PTPA phases. Hence, both Au NPs localize at the PS/PTPA interface and function as compatibilizers in the PS/PTPA blend. To show the compatibilizing effect of the particles, the morphological behaviors of PS/PTPA blends containing different particle volume fractions (ϕ<SUB><I>p</I></SUB>) of Au NPs were observed using cross-sectional TEM, and for quantitative analysis, the size distribution of PTPA droplets in the PS matrix was obtained for each sample. The number-average droplet diameter (<I>D</I><SUB><I>n</I></SUB>) of the PTPA domain in the blend was dramatically reduced from 1.4 μm to 500 nm at a small ϕ<SUB><I>p</I></SUB> of 1.0 vol % Au NP-1. The same trend of decreasing <I>D</I><SUB><I>n</I></SUB> was also observed with the addition of larger Au NP-2, but a higher ϕ<SUB><I>p</I></SUB> was required to obtain the same amount of reduction in the PTPA droplet size. The ϕ<SUB><I>p</I></SUB> required to fully cover the PS/PTPA interface as a packed monolayer of Au NPs was calculated as 0.98 vol % for Au NP-1 and 3.38 vol % for Au NP-2, thus giving excellent agreement with critical ϕ<SUB><I>p</I></SUB> values for the saturation of the PTPA droplet diameter <I>D</I><SUB><I>n</I></SUB>. To demonstrate the effectiveness of Au NPs as compatibilizers, polystyrene-<I>b</I>-poly(triphenylamine) (PS-<I>b</I>-PTPA) block copolymers were also synthesized and used as compatibilizers in the PS/PTPA blend. The decrease in <I>D</I><SUB><I>n</I></SUB> with the addition of PS-<I>b</I>-PTPA was always smaller than that with addition of Au NP-1 at the same ϕ<SUB><I>p</I></SUB>, indicating that Au NPs are more effective compatibilizers. This different behavior can be attributed to the presence of PS-<I>b</I>-PTPA compatibilizers as micelles or free chains in the homopolymer matrix. In contrast, most Au NPs were strongly adsorbed to the PS/PTPA interface.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2011/mamobx.2011.44.issue-24/ma2020134/production/images/medium/ma-2011-020134_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma2020134'>ACS Electronic Supporting Info</A></P>
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Adilah Mohamed Nageib,Amanatuzzakiah Abdul Halim,Anis Nurashikin Nordin,Fathilah Ali The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.1
The overuse of pesticides in agricultural sectors exposes people to food contamination. Pesticides are toxic to humans and can have both acute and chronic health effects. To protect food consumers from the adverse effects of pesticides, a rapid monitoring system of the residues is in dire need. Molecularly imprinted polymer (MIP) on a screen-printed electrode (SPE) is a leading and promising electrochemical sensing approach for the detection of several residues including pesticides. Despite the huge development in analytical instrumentation developed for contaminant detection in recent years such as HPLC and GC/MS, these conventional techniques are time-consuming and labor-intensive. Additionally, the imprinted SPE detection system offers a simple portable setup where all electrodes are integrated into a single strip, and a more affordable approach compared to MIP attached to traditional rod electrodes. Recently, numerous reviews have been published on the production and sensing applications of MIPs however, the research field lacks reviews on the use of MIPs on electrochemical sensors utilizing the SPE technology. This paper presents a distinguished overview of the MIP technique used on bare and modified SPEs for the detection of pesticides from four recent publications which are malathion, chlorpyrifos, paraoxon and cyhexatin. Different molecular imprint routes were used to prepare these biomimetic sensors including solution polymerization, thermal polymerization, and electropolymerization. The unique characteristics of each MIP-modified SPE are discussed and the comparison among the findings of the papers is critically reviewed.
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Electrospun Porous Polylactic Acid Fibers Containing CdS for Degradation of Methylene Blue
Chit Seng Ho,Nur Hafizah Zainal Abidin,Muhammad Wahyu Nugraha,Nonni Soraya Sambudi,Fathilah Ali,MOHD Dzul Hakim Wirzal,Laksmi Dewi Kasmiarno,Sarah Amalina Adli 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
The immobilization of photocatalyst in polymer fibers has been found to improve photodegradation of dye andrecyclability of material. In this study, porous polylactic acid (PLA) fibers were utilized as photocatalyst support usingelectrospinning technique to synthesis the fibers. The cadmium sulfide (CdS) was embedded in fibers at the amount of1 wt%, 3 wt%, and 5 wt% as photocatalyst agent with absorption in visible light range. The electrospun fibers experiencedincreasing in diameter for 2.6 times (from 175 nm to 450 nm), due to incorporation of CdS. The synthesized CdS has bandgap of 2.35 eV, and its presence in composite fibers can be detected by using energy dispersive X-ray (EDX) and X-raydiffraction (XRD) analyses. The photodegradation was performed under low-powered halogen lamp, with 90 % removal ofmethylene blue (MB) after 10 hours of irradiation using CdS(3 wt%)/PLA fibers. This result shows higher performance incomparison with PLA and CdS which could only remove 57 % and 65 % of MB, respectively. The recyclability of compositewas tested with satisfying performance; with around 60 % of MB removal was maintained after five times of recycleexperiments.
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