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Ion-imprinted mesoporous silica hybrids for selective recognition of target metal ions
Moorthy, M.S.,Tapaswi, P.K.,Park, S.S.,Mathew, A.,Cho, H.J.,Ha, C.S. Elsevier 2013 Microporous and mesoporous materials Vol.180 No.-
A novel ion-imprinted functional ligand derivative bearing periodic mesoporous organosilica (IIPMO) was obtained using a sol-gel process from a chemically synthesized organopolysilane precursor with a metal template (Co<SUP>2+</SUP> ion) imprinted ligand centre with tetraethylorthosilicate (TEOS) and cetyltrimethylammoniumbromide (CTAB) as a structural directing surfactant under basic conditions. The imprinted metal template was easily leached out from the hybrid materials during an acid treatment, which resulted in a template-free ion-imprinted network in the PMO pore wall framework with an unaltered particle size and morphology. The ion-imprinted hybrid PMO materials were characterized by X-ray diffraction, Fourier transform-infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, solid-state <SUP>29</SUP>Si and <SUP>13</SUP>C cross polarization magic angle spinning nuclear magnetic resonance spectroscopy, N<SUB>2</SUB> adsorption-desorption analysis and elemental analysis. Furthermore, the removal of the imprinted metal template was confirmed by inductively coupled plasma-atomic emission spectroscopy. The selective rebinding ability of the template ions on the ion-imprinted PMO hybrid adsorbents was examined using a cobalt nitrate solution. The rebinding results showed that the selective efficiency of Co<SUP>2+</SUP> ions on the IIPMOs were 10.1, 7.4 and 9.3 for Cu<SUP>2+</SUP>, Cd<SUP>2+</SUP> and Zn<SUP>2+</SUP>, respectively.
Xiaoqian He,Pradip Kumar Tapaswi,하창식,Wei Huang 한국고분자학회 2021 Macromolecular Research Vol.29 No.5
A series of polyimide (PI) films were prepared through a two-step polycondensation process via chemical imidization using five commercial aromatic dianhydrides and a novel diamine containing an imidazole unit and trifluoromethyl groups, i.e., 4,4'-(((4,5-diphenyl-1H-imidazole-1,2-diyl)bis(4,1-phenylene))bis(oxy)) bis(3-(trifluoromethyl)aniline) (referred to as diamine 3). The number average molecular weights of the resulting PIs ranged from 1.57 × 104 to 3.17 × 104 g·mol-1 with polydispersity indices between 2.53 and 3.60, which were obtained through gel permeation chromatography measurements using a polystyrene standard. All the PIs prepared using diamine 3 were amorphous because of the large side group and kink structure of the diamine. They are soluble in common high-boiling point solvents, such as N-methyl pyrrolidone, dimethyl acetamide, and m-cresol, as well as several low-boiling point solvents, including chloroform and tetrahydrofuran. They exhibit the thermal stability with 10% weight loss temperatures in the range of 545 to 562 °C and 5% weight loss temperatures in the range of 500 to 541 °C in a nitrogen atmosphere. Their glass transition temperatures exceed 245 °C. All the resulting PI films show transmittances of over 74% in the visible light region ranging from 400 to 760 nm. The tensile strength of the PI films is in the range of 30.1 to 52.8 MPa, while the tensile modulus ranges from 1.0 to 1.7 GPa.
AN SIRS EPIDEMIC MODEL ON A DISPERSIVE POPULATION
Ghosh, Asit K.,Chattopadhyay, J.,Tapaswi, P.K. 한국전산응용수학회 2000 The Korean journal of computational & applied math Vol.7 No.3
The spatial spread of a disease in an SIRS epidemic model with immunity imparted by subclinical infection on a population has been considered. The incidence rate of infection and the rate of immunization are both of nonlinear type. The dynamics of the infectious disease and its endemicity in local and global sense have been investigated.