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Dexterous template-free synthesis of ferrisilicate with MFI morphology using rice husk ash
Bhagiyalakshmi, Margandan,Anuradha, Ramani,Palanichamy, Muthiahpillai,Jang, Hyun Tae Elsevier 2010 Journal of non-crystalline solids Vol.356 No.23
<P><B>Abstract</B></P><P>Sodium silicate, the supernatant solution extracted from rice husk ash was used as silica source in hydrothermal synthesis of Fe ZSM-5 zeolites by an organic-free method. Characterization techniques such as X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), BET, X-Ray Fluorescence (XRF), Diffuse Reflectance Spectroscopy — Ultra Violet (DRS-UV) and Temperature-Programmed Desorption-ammonia (NH<SUB>3</SUB>-TPD) unambiguously confirm the formation of Fe ZSM-5. Phosphoric acid used in the synthesis, forms an oxo-anion complex with iron and this complex acts as surface directing agent in the formation of Fe ZSM-5 zeolites. Characterization results prove that rice husk ash can successfully be recycled as ferrisilicates with MFI morphology even in the absence of template.</P>
Preparation and characterization of RGO‑incorporated hypercross‑linked polymers for CO2 capture
Rajangam Vinodh,Cadiam Mohan Babu,Aziz Abidov,Muthiahpillai Palanichamy,Wang Seog Cha,Hyun Tae Jang 한국탄소학회 2019 Carbon Letters Vol.29 No.1
The growing demand for nano-structured composite materials and sustainable processes for next generation CO2 capture technologies has necessitated the need to develop novel and cost-effective synthetic routes for solid CO2 adsorbents based on hypercross-linked polymers (HCPs) and reduced graphene oxide (RGO) microporous sorbent materials with improved physico-chemical properties. The most important selection is modification of the synthesized microporous sorbent materials by the incorporation of RGO, giving rise to composite materials that combine the properties of both. These hybrid materials will be of great potential for carbon capture and storage (CCS) applications, especially for post-combustion CO2 capture, owing to the increase in CO2 capturing efficiency and selectivity to CO2 compared to other flue gases. Herein, we report a facile and effective approach for fabrication of HCPs-supported reduced graphene oxide composites. The microporous HCPs was synthesized using 4,4′-bis(chloromethyl)-1,1′-biphenyl monomer by Friedel–Crafts alkylation. The RGO was prepared by modified Hammers method. The as-synthesized composites were characterized by TEM, SEM, FTIR, TGA and N2 adsorption–desorption isotherm. The HCP/RGO composite showed maximum CO2 adsorption of 5.1 wt% than the HCPs alone at 40 °C and 1 atm.
Solvent free synthesis of coumarin derivative by the use of AlSBA-1 molecular sieves
Mei Mei Peng,장현태,Pushparaj Hemalatha,Mani Ganesh,Muthiahpillai Palanichamy 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
AlSBA-1 molecular sieves were synthesized successfully and used for the synthesis of coumarins throughPechmann condensation. The synthesized AlSBA-1 catalysts were characterized by XRD, BET, SEM, FTIR,TGA techniques. The synthesized materials possess large surface area with mesopores. Pechmanncondensation of 3-methoxyphenol and ethyl acetoacetate was carried out under solvent free conditionand 7-methoxy-4-methylcoumarin was the main product. The selectivity of the product was found to be74.04%. Among the synthesized catalysts, AlSBA-1(2) showed high activity than others due to highdensity of acid sites. Hence, AlSBA-1 molecular sieves a better choice of catalyst for the synthesis ofcoumarins.
Oxidation of Ethylbenzene Using Nickel Oxide Supported Metal Organic Framework Catalyst
Mei Mei Peng,Ung Jin Jeon,Mani Ganesh,Abidov Aziz,RAJANGAMVINODH,Muthiahpillai Palanichamy,장현태 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.11
A metal organic framework-supported Nickel nanoparticle (Ni–MOF–5) was successfully synthesized using a simple impregnation method. The obtained solid acid catalyst was characterized by Powder X–ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption–desorption and thermogravimetric analysis (TGA). The catalyst was highly crystalline with good thermodynamic stability (up to 400 °C) and high surface area (699 m2g–1). The catalyst was studied for the oxidation of ethyl benzene, and the results were monitored via gas chromatography (GC) and found that the Ni–MOF–5 catalyst was highly effective for ethyl benzene oxidation. The conversion of ethyl benzene and the selectivity for acetophenone were 55.3% and 90.2%, respectively.
Vinodh, Rajangam,Jung, Eui Min,Ganesh, Mani,Peng, Mei Mei,Abidov, Aziz,Palanichamy, Muthiahpillai,Cha, Wang Seog,Jang, Hyun Tae Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-
<P><B>Abstract</B></P> <P>We synthesized highly porous hypercross-linked polymers of (4, 4′-bis ((chloromethyl)-1, 1′-biphenyl-benzyl chloride)) [designated as HCP-BCMB] and (1, 3, 5-triphenyl benzene-1, 4-bis (chloromethyl) benzene) [designated as HCP-TPB] as sorbents for the removal of volatile organic compounds such as chloroform, toluene and ethyl methyl ketone under humidified conditions. The micro-porous nature of the hypercross-linked polymers (pore diameter 0.8nm) was confirmed by Brunner–Emmet–Teller (BET) and scanning electron microscopy (SEM) techniques. HCP-TPB showed a maximum adsorption of 32.8 wt% for toluene. In addition, both the HCPs exhibited CO<SUB>2</SUB> adsorption close to 6 wt% at 25°C and 1atm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesized highly porous hypercross-linked polymers as a sorbent for the removal of VOCs. </LI> <LI> Porous nature of the HCPs was confirmed by BET and SEM techniques. </LI> <LI> Maximum toluene adsorption of 32.8 wt% by HCP-TPB. </LI> <LI> DRS UV–visible spectroscopy confirms conjugated quinonoid matrix in both the polymers. </LI> </UL> </P>
Synthesis and Characterization of 1-octyl 2-cyano Acrylate for Wound Healing Applications
Rajangam Vinodh,Cadiam Mohan Babu,Aziz Abidov,Rramaswamy Ravikumar,Muthiahpillai Palanichamy,Eun Young Choi,Hyun Tae Jang 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.1
Cyanoacrylate glues are quick setting materials which rapidly cure to hard, clear glassy resins. Its synthesis too has not been reported in the open literature so far. Synthetic methods, which engage esterification of cyanoacetic acid with a preferred alcohol, polymerization by knoevenagel condensation and successive depolymerization, are applied to the synthesis of lower membered alkyl cyanoacryaltes in which the alkyl groups carry less than 8 carbons. We have synthesized 1-octyl cyanoacetate by a traditional method involving p-toluene sulphonic acid as the catalyst. In the second step, we have attempted the preparation of poly (n-octyl cyanoacrylate) by the reaction of formaldehyde with n-octyl-2-cyanoacetate in the presence of both piperidine and potassium carbonate in the absence of any solvents. Its FTIR spectrum confirmed its functional groups: Its –OH stretching yielded a broad band around 3400 cm-1. The polymer was depolymerized using poly phosphoric acid catalyst under vacuum to obtain the monomer. A simple method of obtaining monomer was also attempted by the reaction of 1-octyl- 2-cyano acetate and diiodomethane in the presence of potassium carbonate. This process directly yields the monomer. The second method looks better than the others, and it can be applied to any type of alcohols.
Rramaswamy Ravikumar,Mei Mei Peng,Aziz Abidov,Cadiam Mohan Babu,Rajangam Vinodh,Muthiahpillai Palanichamy,Eun Young Choi,Hyun-Tae Jang 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.2
For treating the chronic illnesses, the best choice of drug delivery might be the controlled drug delivery systems. Nanoscaled drug delivery systems like nanofibres, nanoparticles are in the advancement of the controlled drug delivery system. Nanofibres are being a good choice due to its advantages like high drug loading and encapsulation efficiency. The present study is concerned with the synthesis of simple electrospunned nanofibres of Chitosan (CHI)/Polyvinyl alcohol (PVA) blended with Hydroxy ethyl cellulose (HEC) which will be preloaded with a model chemotherapeutic agent 5-Fluorouracil (5-FU) before electrospinning. HEC is chosen for its capability of enhancing the nanofiber formation since it is used as the thickening agents in several fields. The various mixture proportions of HEC and PVA blends were tried to form electrospunned fibers and characterized usingFT-IT, SEM, TGA and UV-VIS (for drug release study). The data output strengthening that HEC might be used to get the optimum nanofibre in the CHI/PVA nanofibre preparation which may be useful for controlled releasing of the drugs like 5-FU for treating colo-rectal cancer like chronic illnesses.