Polymer-grafted mesocellular silica foams: Influence of reaction conditions on the mesostructure and polymer content

Meléndez‐Ortiz, H. Iván; Saucedo-Zuñiga, Noé; Puente-Urbina, Bertha; León, Griselda Castruita‐de; Mercado-Silva, Jesús Alfonso; Saucedo‐Salazar, Esmeralda

doi:10.1016/j.matchemphys.2017.10.011

Cited by 12 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The characteristic bands at 1464 and 1511 cm –1 are due to carbonate species . The characteristic MCF broad stretching and bending bands of Si–O–Si were observed at 1082 and 810 cm –1 , (Figure , b–i). MCF shows a band at 970 cm –1 (Figure A) for the Si–OH linkage .…”

Section: Resultsmentioning

confidence: 92%

See 1 more Smart Citation

Selectivity Engineering in One-Pot Selective Synthesis of Drug Nabumetone over Novel Ni-Promoted La-Mg Oxide/Mesoporous Cellular Foam as Catalyst and Kinetic Modeling

Pisal

Yadav

2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

One-pot synthesis of one of the popular non-steroidal antiinflammatory drugs nabumetone (NBM) was achieved by using a novel catalyst. A series of mesoporous cellular foam (MCF) supported lanthanum magnesium mixed oxide (x% LMMO, x = 10−50 wt %) catalysts, further modified with Ni, Cu, and Fe dopants via a sequential impregnation method, were evaluated for the one-pot synthesis of NBM from 6-methoxy-2naphthaldehyde (6MNAL) and acetone. Ni was the best metal, and thus various Ni loadings (2, 4, and 6 wt %) were tested for their efficacy. The 4% Ni-40%LMMO/MCF catalyst was thus optimized as the best candidate. 4% Ni-40%LMMO/MCF offered complete conversion of 6MNAL at a mole ratio of 6MNAL/acetone of 1:30 with 93% selectivity to NBM at 140 °C and 15 atm of H 2 in 8 h. All catalysts were characterized using CO 2 temperatureprogrammed desorption, X-ray diffraction, small-angle X-ray scattering, Fourier transform infrared, Brunauer−Emmett−Teller surface area analysis, temperature-programmed reduction, field emission scanning electron microscopy, energy-dispersive spectroscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and differential scanning calorimetry−thermogravimetric analysis. The reaction mechanism and kinetic model for condensation as well as the hydrogenation step were established. The catalyst was active, selective, and robust.

show abstract

Section: Resultsmentioning

confidence: 92%

“…35 All the samples of the MCF supported catalyst (Figure 6, b−i) show the −OH vibration band of medium intensity at 1630 cm −1 , which is assigned to probable H−O−H bending. 34 The broad band of −OH stretching vibration at 3441 cm −1 due to silanols 33 was observed, as presented in Figure 6(b−i).…”

Section: One-pot Synthesismentioning

confidence: 88%

Selectivity Engineering in One-Pot Selective Synthesis of Drug Nabumetone over Novel Ni-Promoted La-Mg Oxide/Mesoporous Cellular Foam as Catalyst and Kinetic Modeling

Pisal

Yadav

2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The functionalization of MNPsFe 3 O 4 -SiO 2 was carried out according to our previous works [ 38 , 39 ]. Briefly, VTMS (300 mg) was dissolved in 13 mL of toluene (previously dehydrated with MgSO 4 ) under constant stirring for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of a pH- and Temperature-Sensitive Fe3O4-SiO2-Poly(NVCL-co-MAA) Nanocomposite for Controlled Delivery of Doxorubicin Anticancer Drug

et al. 2023

View full text Add to dashboard Cite

This work reports the synthesis, characterization, and in vitro release studies of pH- and temperature-sensitive Fe3O4-SiO2-poly(NVCL-co-MAA) nanocomposite. Fe3O4 nanoparticles were prepared by chemical coprecipitation, coated with SiO2 by the Stöber method, and functionalized with vinyl groups. The copolymer poly(N-vinylcaprolactam-co-methacrylic acid) (poly(NVCL-co-MAA)) was grafted onto the functionalized Fe3O4-SiO2 nanoparticles by free radical polymerization. XRD, FTIR, TGA, VSM, and TEM techniques were performed to characterize the nanocomposite. The release behavior of Doxorubicin (DOX) loaded in the nanocomposite at pH 5.8 and 7.4, and two temperatures, 25 and 37 °C, was studied. According to the release studies, approximately 55% of DOX is released in 72 h at pH 7.4, regardless of temperature. At pH 5.8, 78% of DOX was released in 48 h at 25 °C, and when increasing the temperature to 37 °C, more than 95 % of DOX was released in 24 h. The DOX release data treated with Zero-order, first-order, Higuchi, and Korsmeyer–Peppas models showed that Higuchi’s model best fits the data, indicating that the DOX is released by diffusion. The findings suggest that the synthesized nanocomposite may be useful as a DOX carrier in biomedical applications.

show abstract

“…It is the most common matrix form of silica which has been exploited for the immobilizing metal catalyst (Figure 5). [74][75][76] The commonly used templates are Polyurethane foam and CTAB. MCFs can be produced by various methods using the templates which are mentioned briefly: (i) Slurry-based method can be used for co-dispersion and uniform dispersion of various phases in a solvent.…”

Section: Mesocellular Silica Foammentioning

confidence: 99%

“…Schematic representation of the mesoporous silica foam. [74][75][76] ChemistrySelect based method using which usually shows higher permeability as compared to the other methods (iii) Steam heating method in which desirable pore sizes are obtained. MCF is created by microemulsion method consisting of uniform spherical cells that can modified according to the amount of organic oil added to it.…”

Section: Mesocellular Silica Foammentioning

confidence: 99%

Porous Silica Support for Immobilizing Chiral Metal Catalyst: Unravelling the Activity of Catalyst on Asymmetric Organic Transformations

2022

View full text Add to dashboard Cite

The role of chiral metal catalysts in asymmetric reactions has developed a new forte for researchers worldwide to boost chiral synthesis in various sectors. By controlling specific interactions among chiral ligands, metal catalysts and the support material, one can design a more selective and efficient chiral heterogeneous catalytic system. Silica has been extensively used as support material in various heterogeneous systems due to its activity, stability, better recovery, and recyclability. This review details recent advances in preparation of the silica suppported chiral catalysts and their applications for various chiral transformatios such as Aldol reaction, Henry reaction, transfer hydrogenation, epoxidation, Passerini reaction etc. The review also covers different mechanisms of immobilization viz., adsorption, electrostatic and covalent interactions. The interaction mechanism of chiral metal catalyst with silica support and factors like matrix pore size and ligand confinement that influence the catalytic performance of enantioselective transformations have also been discussed.

show abstract

Polymer-grafted mesocellular silica foams: Influence of reaction conditions on the mesostructure and polymer content

Cited by 12 publications

References 40 publications

Selectivity Engineering in One-Pot Selective Synthesis of Drug Nabumetone over Novel Ni-Promoted La-Mg Oxide/Mesoporous Cellular Foam as Catalyst and Kinetic Modeling

Selectivity Engineering in One-Pot Selective Synthesis of Drug Nabumetone over Novel Ni-Promoted La-Mg Oxide/Mesoporous Cellular Foam as Catalyst and Kinetic Modeling

Synthesis and Characterization of a pH- and Temperature-Sensitive Fe3O4-SiO2-Poly(NVCL-co-MAA) Nanocomposite for Controlled Delivery of Doxorubicin Anticancer Drug

Porous Silica Support for Immobilizing Chiral Metal Catalyst: Unravelling the Activity of Catalyst on Asymmetric Organic Transformations

Contact Info

Product

Resources

About