Synthesis and Characterization of Mesoporous Silica Functionalized with Calix[4]arene Derivatives

Alahmadi, Sana M.; Mohamad, Sharifah; Maah, Mohd Jamil

doi:10.3390/ijms131013726

Cited by 25 publications

(16 citation statements)

References 35 publications

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“…This basically means that the surface area, pore diameter, and pore volume of MIP1/NIP1 could theoretically increase after swelling [ 34 ]. It might also serve as evidence of the fact that β-CD was mainly isolated inside the internal surfaces of the polymers [ 35 ]. It was proven that the isolated β-CD was not the main component being cross-linked with the TRIM cross-linker, but MAA located on the surface of the polymer matrix that interacted with the TRIM cross-linker.…”

Section: Resultsmentioning

confidence: 99%

Exploiting β-Cyclodextrin in Molecular Imprinting for Achieving Recognition of Benzylparaben in Aqueous Media

Asman

Mohamad

Sarih

2015

IJMS

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The molecularly imprinted polymer (MIP) based on methacrylic acid functionalized β-cyclodextrin (MAA-β-CD) monomer was synthesized for the purpose of selective recognition of benzylparaben (BzP). The MAA-β-CD monomer was produced by bridging a methacrylic acid (MAA) and β-cyclodextrin (β-CD) using toluene-2,4-diisocyanate (TDI) by reacting the –OH group of MAA and one of the primary –OH groups of β-CD. This monomer comprised of triple interactions that included an inclusion complex, π–π interaction, and hydrogen bonding. To demonstrate β-CD performance in MIPs, two MIPs were prepared; molecularly imprinted polymer-methacrylic acid functionalized β-cyclodextrin, MIP(MAA-β-CD), and molecularly imprinted polymer-methacrylic acid, MIP(MAA); both prepared by a reversible addition fragmentation chain transfer polymerization (RAFT) in the bulk polymerization process. Both MIPs were characterized using the Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and Brunauer-Emmett-Teller (BET). The presence of β-CD not only influenced the morphological structure, it also affected the specific surface area, average pore diameter, and total pore volume of the MIP. The rebinding of the imprinting effect was evaluated in binding experiments, which proved that the β-CD contributed significantly to the enhancement of the recognition affinity and selective adsorption of the MIP.

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Section: Resultsmentioning

confidence: 99%

Exploiting β-Cyclodextrin in Molecular Imprinting for Achieving Recognition of Benzylparaben in Aqueous Media

Asman

Mohamad

Sarih

2015

IJMS

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“…All imprinted polymers were regarded as mesoporous particles, as the dp values were around 2-100 nm. Moreover, the Vp values of the imprinted polymers were low, which proved that β-CD was deeply isolated within the internal surfaces of the imprinted polymers [44,49]. Unsurprisingly, the S values of MIPs were higher than those of the NIPs, proving that the recognition sites of the template appeared on the surface of MIPs.…”

Section: Characterization Of Raft-mips and Mipsmentioning

confidence: 96%

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

2015

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Two types of reversible addition-fragmentation chain transfer molecularly imprinted polymers (RAFT-MIPs) were synthesized using different monomers, which were methacrylic acid functionalized β-cyclodextrin (MAA-β-CD) and 2-hydroxyethyl methacrylate functionalized β-cyclodextrin (HEMA-β-CD), via reversible addition-fragmentation chain transfer (RAFT) polymerization, and were represented as RAFT-MIP(MAA-β-CD) and RAFT-MIP(HEMA-β-CD), respectively. Both RAFT-MIPs were systematically characterized using Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Brunauer-Emmett-Teller (BET), and rebinding experimental study. The results were compared with MIPs synthesized via the traditional radical polymerization (TRP) process, and were represented as MIP(MAA-β-CD) and MIP(HEMA-β-CD). Morphology results show that RAFT-MIP(MAA-β-CD) has a slightly spherical feature with a sponge-like form, while RAFT-MIP(HEMA-β-CD) has a compact surface. BET results show that the surface area of RAFT-MIP(MAA-β-CD) is higher than MIP(MAA-β-CD), while the RAFT-MIP(HEMA-β-CD) surface area is lower than that of MIP(HEMA-β-CD). Rebinding experiments indicate that the RAFT agent increased the binding capacity of RAFT-MIP(MAA-β-CD), but not of RAFT-MIP(HEMA-β-CD), which proves that a RAFT OPEN ACCESSPolymers 2015, 7 485 agent does not always improve the recognition affinity and selective adsorption of MIPs. The usability of a RAFT agent depends on the monomer used to generate potential MIPs.

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“…Aerward, the materials were utilized to examine the sorption properties of organotin compounds tributyltin (TBT), triphenyltin (TPT) and dibutyltin (DBT). 106,107 MCM allyl calix 141, as another inorganicorganic hybrid material, was synthesized by Narkhede et al using covalent modication of an MCM-41 with a tetra-allyl calixarene 140 conjugate. Scheme 41 demonstrates the synthesis of allyl calixarene functionalized mesoporous silica.…”

Section: Calixarene-functionalized Silica Gelmentioning

confidence: 99%

Recent progress to construct calixarene-based polymers using covalent bonds: synthesis and applications

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Synthesis and Characterization of Mesoporous Silica Functionalized with Calix[4]arene Derivatives

Cited by 25 publications

References 35 publications

Exploiting β-Cyclodextrin in Molecular Imprinting for Achieving Recognition of Benzylparaben in Aqueous Media

Exploiting β-Cyclodextrin in Molecular Imprinting for Achieving Recognition of Benzylparaben in Aqueous Media

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

Recent progress to construct calixarene-based polymers using covalent bonds: synthesis and applications

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