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RISS 인기검색어
- 검색키워드
- 저자 : Sambudi, N.S. (검색결과 6 건)
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Sambudi, N.S.,Kim, M.G.,Park, S.B. Elsevier 2016 Materials Science and Engineering C Vol. No.
<P>The electrospun fibers consist of backbone fibers and nano-branch network are synthesized by loading of ellipsoidal calcium carbonate in the mixture of chitosan/poly(vinyl alcohol) (PVA) followed by electrospinning. The synthesized ellipsoidal calcium carbonate is in submicron size (730.7 +/- 152.4 nm for long axis and 212.6 +/- 51.3 nm for short axis). The electrospun backbone fibers experience an increasing in diameter by loading of calcium carbonate from 71.5 +/- 23.4 nm to 281.9 +/- 51.2 nm. The diameters of branch fibers in the web-network range from 15 nm to 65 nm with most distributions of fibers are in 30-35 nm. Calcium carbonate acts as reinforcing agent to improve the mechanical properties of fibers. The optimum value of Young's modulus is found at the incorporation of 3 wt.% of calcium carbonate in chitosan/PVA fibers, which is enhanced from 15.7 +/- 3 MPa to 432.4 +/- 943 MPa. On the other hand, the ultimate stress of fibers experiences a decrease. This result shows that the fiber network undergoes changes from flexible to more stiff by the inclusion of calcium carbonate. The thermal analysis results show that the crystallinity of polymer is changed by the existence of calcium carbonate in the fiber network. The immersion of fibers in simulated body fluid (SBF) results in the formation of apatite on the surface of fibers. (C) 2015 Elsevier B.V. All rights reserved.</P>
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Sambudi, N. S.,Park, S. B.,Cho, K. Springer Science + Business Media 2016 JOURNAL OF MATERIALS SCIENCE - Vol.51 No.16
<P>Mineralization of electrospun chitosan/poly(vinyl alcohol) (PVA) with CaCO3 was performed as a reinforcement strategy to produce a biocompatible material with good mechanical properties. Disk-like layered and cubic CaCO3 particles were formed when the composites were dried at low and high concentrations of CO2, respectively, followed by a transformation of the amorphous CaCO3 into calcite. The highest ultimate stress value was found to be 44 +/- 3.2 MPa for the composite with 17 wt% of CaCO3, which was crosslinked by glutaraldehyde and dried at high concentrations of CO2. The highest value of the Young's modulus was 2328.35 +/- 204.9 MPa for the composite with 34 wt% of CaCO3 that was dried at high concentrations of CO2. The bioactivity of the obtained composites was tested by 6-day incubation in simulated body fluid (SBF), resulting in flake-like apatite structures grown on the composite surface. The composites retained around 50 % of their ultimate stress value after immersion in SBF. The mineralization of electrospun chitosan/PVA with CaCO3 produced composites with enhanced mechanical properties, which can be potentially used as scaffolds in tissue engineering applications.</P>
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Kim, Jinsu,Sambudi, Nonni Soraya,Cho, Kuk Elsevier 2019 Journal of environmental management Vol.231 No.-
<P><B>Abstract</B></P> <P>Owing to their high-risk factor, many attempts have been made to remove radionuclides from water. Sr<SUP>2+</SUP> ions are the target of removal by synthesized hydroxyapatite in this research. A facile method for synthesizing high-surface-area hydroxyapatite by in-situ precipitation using excess diammonium phosphate solution and without any additive was developed. The highest surface area achieved using this method was 177.00 m<SUP>2</SUP>/g, and the synthesized hydroxyapatite was also mesoporous. The effects of different pH, temperatures, and ion concentrations during synthesis on the properties of the hydroxyapatite were assessed, and it was found that a low temperature and high pH were optimal for synthesizing high-surface-area hydroxyapatite. The maximum strontium removal capacity of 28.51 mg/g was achieved when the pH-7.5 solution was used. This performance is competitive in comparison with previously developed synthesized materials. Synthesized hydroxyapatite could effectively remove radioactive strontium from an aqueous solution for nuclear waste management.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydroxyapatite was produced an using in-situ precipitation without an additive. </LI> <LI> It had a high surface area of 177 m<SUP>2</SUP>/g and mesopores with a Ca/P ratio of 1.67. </LI> <LI> Its maximum removal capacity of strontium was 28.51 mg/g at pH 7.5. </LI> <LI> It can remove radioactive strontium from an aqueous solution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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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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Adamu Usman Abubakar,Abu Bakar Noor Hana Hanif,Zango Zakariyya Uba,Sambudi Nonni Soraya,Iqbal Anwar,Hussin Mohd Hazwan,Hamidon Tuan Sherwyn 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Low-temperature hydrothermal technique was employed for the synthesis of highly porous and crystalline MIL-101(Cr) metal-organic frameworks series. The resulting as-synthesized MOFs were characterized by Fourier transform infrared (FTIR) spectroscopy, powdered X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption analysis, thermogravimetric analysis (TGA), photoluminescence (PL) spectroscopy, and ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy. The photocatalytic activity of the MOFs was evaluated for degradation of phenanthrene (PHE) under visible light irradiation. Among the MOFs, MIL-101@160 has the highest Brunner Emmett-Teller (BET) specific surface area and corresponding pore volume of 2,592.2 m2g−1 and 1.09 cm3g−1, respectively. Furthermore, it has shown higher photocatalytic degradation of the PHE than other samples with 98% degradation efficiency achieved within 150 minutes.
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