Synthesis of Highly Ordered Mesoporous MCM-41: Selective External Functionalization by Time Control

Silva, Ana Claudia P. da; Cordeiro, Patrícia Hissae Yassue; Estevão, Bianca Martins; Caetano, Wilker; Eckert, Hellmut; Santin, Silvana M. O.; Moisés, Murilo Pereira; Hioka, Noboru; Tessaro, André Luiz

doi:10.21577/0103-5053.20190058

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…Upon functionalization with APTES, a deviation from the expected H1-type loop was observed; similar behavior in literature is usually attributed to pore size reduction upon functionalization with organosilanes. [47,48] Furthermore, we witnessed a decrease in the specific surface area (SSA), pore width and pore volume (see Table 1) which was much more severe in the case of NH 2 MSN(OP), due to a residual fraction of SDA within the pores.…”

Section: Resultsmentioning

confidence: 96%

“…For the NH 2 MSN(G) sample, prepared by post‐synthetic grafting, three regions can be identified in the decomposition profile. The first one, from 180 to about 500 °C, can be ascribed to the condensation of silanol groups and consequent water loss, referring to silanol groups of the silica surface which were not involved in the grafting as well as to the Si atoms of mono‐ or bi‐legged alkylsiloxane groups [47–51] . The second region is characterized by a steeper slope and goes from ca.…”

Section: Resultsmentioning

confidence: 99%

“…The first one, from 180 to about 500 °C, can be ascribed to the condensation of silanol groups and consequent water loss, referring to silanol groups of the silica surface which were not involved in the grafting as well as to the Si atoms of mono-or bi-legged alkylsiloxane groups. [47][48][49][50][51] The second region is characterized by a steeper slope and goes from ca. 500 °C to about 700 °C; the weight loss in this region results from the decomposition of bound phases and can be used for the estimation of the amount of grafted functional groups (Table 2).…”

Section: Resultsmentioning

confidence: 99%

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Mesoporous Silica Nanoparticles Functionalized with Amino Groups for Biomedical Applications

et al. 2021

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The synthesis and characterization of amino‐functionalized mesoporous silica nanoparticles are presented following two different synthetic methods: co‐condensation and post‐synthesis grafting of 3‐aminopropyltriethoxysilane. The amino groups’ distribution on the mesoporous silica nanoparticles was evaluated considering the aggregation state of a grafted photosensitizer (Verteporfin) by using spectroscopic techniques. The homogeneous distribution of amino groups within the silica network is a key factor to avoid aggregation during further organic functionalization and to optimize the performance of functionalized silica nanoparticles in biomedical applications. In addition, the formation of a protein corona on the external surface of both bare and amino‐functionalized mesoporous silica was also investigated by adsorbing Bovine Serum Albumin (BSA) as a model protein. The adsorption of BSA was found to be favorable, reducing the aggregation phenomena for both bare and amino‐modified nanoparticles. Nevertheless, the dispersant effect of BSA was much more evident in the case of amino‐modified nanoparticles, which reached monodispersion after adsorption of the protein, thus suggesting that amino‐modified nanoparticles can benefit from protein corona formation for preventing severe aggregation in biological media.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Mesoporous Silica Nanoparticles Functionalized with Amino Groups for Biomedical Applications

et al. 2021

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“…25º aproximadamente. Observándolo con más precisión, el difractograma muestra otros picos más ensanchados lo cual se pueden indexar como [1,1,0] y [2,0,0], picos de Bragg característicos también de una estructura mesoporosa hexagonal, según ha sido reportado por diversos autores, la presencia de este pico representa cierto orden en los poros, por lo cual se confirma la estructura deseada en las nanopartículas (Kamarudin et al, 2013;Kresge & Roth, 2013;Mas Font, 2014;P. da Silva et al, 2019).…”

Section: Difracción De Rayos X De áNgulo Bajo (Saxrd)unclassified

Memorias del X Congreso Nacional de Alconpat México 2022

Borges¹,

Guzmán²,

López³

2023

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Alconpat México fue creada en abril del año 2002. Fue la primera delegación de Alconpat Internacional. Desde aquella época, y en cada año par, se ha llevado a cabo el Congreso Nacional de Alconpat México, que de cariño es llamado el Pre-Conpat. Desde aquel entonces, numerosas delegaciones nacionales se han creado año con año. En esta ocasión el comité organizador quizo hacer una celebración académica por los primeros 20 años. Esto implicó darle al congreso una imagen mística que incluye la presentación de una obra alusiva del famoso pintor Guido Farina y que engalana este libro de memorias. La obra consiste en una mano que evoca el mando de las diferentes directivas bajo la tutela del consejo fundador ilustrado con los nombres de las personas de éste en la forma de un halo. La mano sostiene una brújula que indica el camino de nuestra asociación, donde se encuentra el logo de Alconpat México y un Katun maya que representa el número 20, alusivo al 20 aniversario. Estamos muy contentos de compartir contigo ésta celebración académica.

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“…Da Silva [87] also uses 29 Si NMR to evaluate the condensation degree during a one-pot synthesis. A higher Q 4 /(Q 2 +Q 3 ) ratio would demonstrate a high condensation degree resulting in a material with superior chemical and mechanical stability.…”

Section: Sulfonic Acid-functionalized Materials: Characterizationmentioning

confidence: 99%

Sulfonic Acid-Functionalized Inorganic Materials as Efficient Catalysts in Various Applications: A Minireview

Testa

Parola

2021

Catalysts

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Acid catalysis is widely used in the chemical industry, and nowadays many efforts are being focused on replacing the more common homogeneous catalysts with heterogeneous ones in order to make greener the industrial processes. In this perspective, sulfonic solid acid materials represent a valid alternative to the homogenous mineral acid in several acid catalyzed reactions. In this minireview, an overview of the recent advances on the preparation, stability and application of these materials is reported. Special attention is addressed to the sustainability of the considered processes, starting from the catalyst’s preparation, the use of green solvents and reducing the possible reaction steps. Ways to tackle the main drawback represented by easy leaching of acid groups are described. For an easy catalyst recovery, the use of a magnetic core in a catalyst particle, with the related synthetic approaches, is also illustrated. Finally, a section is dedicated to the principal characterization techniques to identify the structural properties of the catalysts.

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Synthesis of Highly Ordered Mesoporous MCM-41: Selective External Functionalization by Time Control

Cited by 4 publications

References 27 publications

Mesoporous Silica Nanoparticles Functionalized with Amino Groups for Biomedical Applications

Mesoporous Silica Nanoparticles Functionalized with Amino Groups for Biomedical Applications

Memorias del X Congreso Nacional de Alconpat México 2022

Sulfonic Acid-Functionalized Inorganic Materials as Efficient Catalysts in Various Applications: A Minireview

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