Hydrothermal Synthesis of Mesoporous Silica MCM-41 Using Commercial Sodium Silicate

Meléndez‐Ortiz, H. Iván; Mercado-Silva, Alfonso; Garcı́a-Cerda, L.A.; Castruita, Griselda; Perera-Mercado, Yibran

doi:10.29356/jmcs.v57i2.215

Cited by 20 publications

(20 citation statements)

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“…Figure 3 shows the SAXS patterns of MCM-41 and the functionalized samples. Small-angle XRD of MCM-41 showed a pattern with (100), (110), and (200) reflections at 2θ = 2.46, 4.27, and 4.92, respectively, characteristic of the hexagonal structure of MCM-41 as described in the literature [29]. It is worth nothing that the functionalized samples also exhibited the typical well-ordered hexagonal mesoporous structure, with three distinct diffraction peaks.…”

Section: Resultsmentioning

confidence: 52%

“…This hysteresis indicates the amphiphilic feature of the mesoporous surface, where there is a capillary condensation of the adsorbate (e.g., N 2 ). Firstly, a monolayer forms on the walls of the material, followed by multiple layers that form, as suggested in the results from the graph, where the saturation pressure is reached before the saturation pressure of the gas (Figure 2) [29,30]. Note that the form of the isotherm is not affected by the process of the functionalization of MCM-41/AP and MCM-41/AP-FFA; a reduction of N 2 adsorption volume for all the relative pressures could be observed, suggesting that the process of chemical surface modification of the nanoparticles had occurred.…”

Section: Resultsmentioning

confidence: 99%

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Response of Fibroblasts MRC-5 to Flufenamic Acid-Grafted MCM-41 Nanoparticles

et al. 2018

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Recently, flufenamic acid (FFA) was discovered among fenamates as a free radical scavenger and gap junction blocker; however, its effects have only been studied in cancer cells. Normal cells in the surroundings of a tumor also respond to radiation, although they are not hit by it directly. This phenomenon is known as the bystander effect, where response molecules pass from tumor cells to normal ones, through communication channels called gap junctions. The use of the enhanced permeability and retention effect, through which drug-loaded nanoparticles smaller than 200 nm may accumulate around a tumor, can prevent the local side effect upon controlled release of the drug. The present work, aimed at functionalizing MCM-41 (Mobil Composition of Matter No. 41) silica nanoparticles with FFA and determining its biocompatibility with human fibroblasts MRC-5 (Medical Research Council cell strain 5). MCM-41, was synthesized and characterized structurally and chemically, with multiple techniques. The biocompatibility assay was performed by Live/Dead technique, with calcein and propidium–iodide. MRC-5 cells were treated with FFA-grafted MCM-41 for 48 h, and 98% of cells remained viable, without signs of necrosis or morphological changes. The results show the feasibility of MCM-41 functionalization with FFA, and its potential protection of normal cells, in comparison to the role of FFA in cancerous ones.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Response of Fibroblasts MRC-5 to Flufenamic Acid-Grafted MCM-41 Nanoparticles

et al. 2018

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“…The regulation of reaction conditions has been decisive in order to obtain well-ordered pore structure with defined morphology. During synthesis processes, time and temperature aging, pH of solution, type of surfactant, and co-surfactant have been evaluated to investigate the effect of reaction conditions on the structural and textural properties of silica particles [18]. Micelles formed by Pluronic 123 and cetyltrimethylammonium bromide (CTAB) as template and co-template, respectively, induced the co-assembling of hydrolyzed silicate species from TEOS to synthesize spherical SBA-15 mesoporous silica with potential application in gas adsorption processes ( Figure 2) [19].…”

Section: Porous Ceramic Materials: Synthesis Methods and Characterizamentioning

confidence: 99%

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

Perera-Mercado¹,

León²,

Piñerez³

2018

Recent Advances in Porous Ceramics

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According to the American National Standards Institute (ANSI), a sensor is a device which provides a usable output in response to a specified measurement of a physical quantity converted into a signal suitable for processing (e.g., optical, electrical, or mechanical signals). On the other hand, porous ceramic materials play an important role as sensor materials, because by selecting a suitable base ceramic material for the intended use and then adjusting their overall porosity, pore size distribution, and pore shape, they can cover different applications such as liquid-gas filters, insulators, catalytic supports, mixed of gases separators and sensors, among others. In addition, they have controlled permeability, high melting point, high superficial area, high corrosion and wear resistance, low expansion coefficient, tailored electronic properties, etc. Currently, a few niche areas demand sensors for compact electronic device design, e.g., leak inspections for oil and gas dispositive, flammable and/or toxic gas detection in waste storage areas and confined spaces, hydrocarbons and their associated gas detection at low temperatures and high humidity conditions, among others. In this chapter, the advances in porous ceramic production for hydrocarbons and associated gas detection will be presented and discussed.

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“…MCM-41 was prepared according to Melendez et al methodology [45], with some small changes in terms of amounts used in the laboratory. The procedure was as follows: Solution A, a desired amount of CTAB (Cetyl Trimethyl Ammonium Bromide) was mixed with 8.5 mL of 4.5-propanol (Merck ® , Kenilworth, NJ, USA) and 100 mL of deionized water.…”

Section: Synthesis Of Mesostructured Silica Mcm-41mentioning

confidence: 99%

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

2019

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This work presents the calorimetric study of five adsorbents with different chemical and textural characteristics: MOF-199, MCM-41, SBA-15, activated carbon prepared from corn cob (GACKP) and graphite. These solids were used to establish the differences between isosteric heats evaluated by three different methods: Clausius–Clapeyron (C-C), Chakraborty, Saha and Koyama (CSK) and Adsorption Calorimetry (A-Cal). The textural characterization results show solids that have values of specific surface area between 2271 m2·g−1 for the MOF-199 and 5.2 m2·g−1 for the graphite. According to the results obtained for the isosteric heats for each sample, the magnitude varies depending on the coverage of the adsorbate and the textural characteristics of each adsorbent. Solids with an organized structure have isosteric heat values that are coincident among the three methods. Meanwhile, heterogeneous solids such as activated carbon values evaluated by the CKS and C-C have a high dispersion method regarding the adsorption calorimetry method. The results obtained show that the adsorption calorimetry, being a direct experimental measurement method, presents less dispersed data. At low quantities, the isosteric heat of nitrogen adsorption decreased in the order MOF-199, GACKP, MCM-41, SBA-15 and Graphite. The order for the isosteric heats values was coherent with the surface characteristics of each of the solids, especially with the pore size distribution. Finally, throughout the coverage examined in this work, the isosteric heats for nitrogen adsorption determined by adsorption calorimetry (A-Cal) were larger than the evaluated by C-C and CSK indirect methods of vaporization. According to the results, it is shown that the adsorption calorimetry allows values of the isosteric heats of adsorption with an error of less than 2% to be established and also reveals the complex nature of the heterogeneity or homogeneity of the adsorbent.

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Hydrothermal Synthesis of Mesoporous Silica MCM-41 Using Commercial Sodium Silicate

Cited by 20 publications

References 0 publications

Response of Fibroblasts MRC-5 to Flufenamic Acid-Grafted MCM-41 Nanoparticles

Response of Fibroblasts MRC-5 to Flufenamic Acid-Grafted MCM-41 Nanoparticles

Porous Ceramic Sensors: Hydrocarbon Gas Leaks Detection

Isosteric Heat: Comparative Study between Clausius–Clapeyron, CSK and Adsorption Calorimetry Methods

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