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A Novel Route to Synthesize Hypercross-linked Conjugated Polystyrene for CO₂ Sorption
Rajangam Vinodh(라자감 비노드),Aziz Abidov(아비도프 아지즈),Mei Mei Peng(펭메이메이),Cadiam Mohan Babu(칸디암 모한 바부),Muthiahpillai Palanichamy(무따이 팔라리차미),Wang Seog Cha(차왕석),Hyun-Tae Jang(장현태) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
Polystyrene is cross-linked to generate micropores for sorption applications. Herein, we report for the first time, hypercross-linking of polystyrene in the presence of Friedel-Crafts catalyst, FeCl3 without a cross-linker. For comparison, polystyrene was also hypercross-linked with a cross-linker, dimethoxy methane with the same catalyst. The cross-linking and de-hydrogenation of cross-links to quinonoid formation were confirmed by FT-IR and 13C-NMR techniques. The hyper cross-linked polymers (HCPs) were also characterized by TGA, DRS-UV, SEM, BET and CO₂ sorption techniques. All the HCPs showed a maximum of 5 weight % CO₂ sorption at 25 °C and 1 atm. The same polymers could also be applied for the sorption of other air pollutants.
Selective Oxidation of Ethylbenzene over Cobalt Impregnated Zeolite ZSM-5
Mei Mei Peng(펭메이메이),Mani Ganesh(마니 가니쉬),Abidov Aziz(아비도프 아지즈),Ung Jin Jeon(전웅진),Rajangam Vinodh(라자감 비노드),Muthiahpillai Palanichamy(무따이 팔라리차미),Hyun Tae Jang(장현태) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
A zeolite supported cobalt catalyst Co-ZSM-5 was synthesized and characterized by Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption and thermogravimetric analysis (TGA). The synthesized catalyst was used for ethylbenzene oxidation reaction. The catalytic reaction was carried out in liquid phase using oxygen as oxidizing agent in solvent-free condition. The results analyzed by Gas chromatography (GC) displayed the catalyst was effective for ethyl benzene oxidation.
Mani Ganesh(마니 가니쉬),Mei Mei Peng(팽메이메이),Aziz Abidov(아비도프 아지즈),Han Seok Oh(오한석),Min Cheol Shin(신민철),Won Geun Joo(주원근),Da Sol Shin(신다솔),Han Gyu Lee(이한규),Tae Jun Park(박태준),Hyun Tae Jang(장현태) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
This work is to develop once daily ace-clofenac controlled drug release formulations by the incorporation of aceclofenac cocrystals in alginate beads (modified release super-saturated drug delivery system). To achieve this goal, aceclofenac cocrystals were prepared using chitosan as a co-former. The synthesized materials were characterized by FT-IR, SEM and XRD technique. Enhancement of dissolution rate was assessed in simulated gastric fluid (pH 1.2). Enhanced oral bioavailability of aceclofenac has been achieved using chitosan cocrystals of aceclofenac and its entrapment into alginate matrix a super saturated drug delivery system (SDDS). Prepared SDDS were evaluated by various physiochemical and pharmacological methods. The result revealed that theprimary cocrystals enhanced the solubility of the drug and the thick gelled polymer matrix that formed from swelling of calcium alginate beads makes it to release the drug in continuous and sustained manner by supersaturated drug diffusion. The Cmax, Tmax and relative bioavailability for aceclofenac cocrystal and aceclofenac SDDS were 2.06 ± 0.42 µg/ml, 1 h, 159.72 ± 10.84 and 2.01 µg/ml, 1 h, 352.76 ± 12.91, respectively. Anti-inflammatory activity of aceclofenac was significantly improved with the SDDS. With respect to the results, it revealed that the SDDS described herein might be a promising tool for the oral sustained release of aceclofenac and likely for that of various other poorly soluble drugs.
Cadiam Mohan Babu(칸디암 모한 바부),Rajangam Vinodh(라자감 비노드),Aziz Abidov(아비도프 아지즈),Mei Mei Peng(팽메이메이),Muthiahpillai Palanichamy(무따이 팔라리차미),WangSeogCha(차왕석),Hyun-Tae Jang(장현태) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
Mesoporous Fe2O₃/TiO₂ was synthesized by sol-gel route using pluronic P123 the as structure directing agent. The mesoporous nature of the material was confirmed from low angle X-ray diffraction. The material was supported on reduced graphene oxide and characterized by FT-IR, Raman, XPS, N2 sorption, HR-TEM and SEM. The reduced graphene oxide supported Fe2O₃/TiO₂ nanocomposite was tested for the sorption of both As(V) and As(III) from aqueous solution. The equilibrium adsorption attained within fifteen minutes for both As(III) and As(V). The maximum adsorption capacity for As(V) and As(III) was found to be 99.5 and 77.7 mg/g at pH 6 and 7 respectively. The sorption was found to high in the pH range of 6-7.
Arthanari Saravanakumar(아따나리 사라바나 쿠멀),Mani Ganesh(마니 가니쉬),Mei Mei Peng(펭메이메이),Abidov Sh Aziz(아비도프아지즈),Hyun Tae Jang(장현태) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.2014 No.2
Antioxidant, antimycobacterial activity of opuntia ficus-indica fruit (OFI) extracts were evaluated according to seasonable cultivation. The antioxidant activities of OFI extracts were assessed by different in vitro methods and the total phenolic and flavonoid contents were also examined. The antimycobacterial activity was measured against Mycobacterium tuberculosis strains H37Rv (ATCC 27294) by microplate alamar blue assay (MABA) method. In antioxidant assay, methanol extracts of OFI in summer season showed the highest antioxidant activity in all tested methods and the lowest IC50wasobservedin2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay. Pearson correlation coefficient was evaluated and the results from the extracts of summer and rainy season OFI were significantly correlated with the total phenolic and flavonoid contents. However, the methanol extracts of OFI in summer showed high level of antimycobacterial activity against the strain of M. tuberculosis H37Rv, with minimum inhibitory concentration (MIC) of 50 µg/ml. The results from this study suggest that OFI could probably be an important source of antioxidant as well as antimycobacterial against M. tuberculosis.