Pore ordering in mesoporous matrices induced by different directing agents

Putz, Ana-Maria; Savii, Cecilia; Ianăși, Cătălin; Dudás, Zoltán; Székely, Kinga Noémi; Plocek, Jiřı́; Sfârloagă, Paula; Săcărescu, Liviu; Almásy, László

doi:10.1007/s10934-014-9899-z

Cited by 25 publications

(26 citation statements)

References 57 publications

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“…The power exponent varied between -3.5 and -4.2, showing no regularity with MTES content or thermal treatment. Value of -4 would correspond to an ideally smooth interface, while the observed deviations from this value point to a rough particle surface [37,38]. The variation of the pore distance is similar to the XRD results, the trends being smoother due to the lower resolution ( Figure 6).…”

Section: Small Angle Neutron Scatteringsupporting

confidence: 72%

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

Putz

Wang

Len

et al. 2017

Applied Surface Science

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Mesoporous silica particles have been synthesized by sol-gel method from tetraethoxysilane (tetraethylorthosilicate, TEOS) and methyltriethoxysilane (MTES), in ethanol and water mixture, at different ratios of the of the silica precursors. Ammonia was used as catalyst at room temperature and hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide, CTAB) as the structure directing agent. Nitrogen sorption, X-ray diffraction and small-angle neutron scattering gave information on the evolution of the gel structure and pore morphologies in the function of MTES/TEOS molar ratio. Thermogravimetric and differential thermal analysis showed that with addition of MTES the exothermic peak indicating the oxidation of the low molecular weight organic fragments shift to higher temperature. A room-temperature, one-pot synthesis of MCM-41 type materials is presented, in which the variation of the MTES concentration allows to change the hydrophobicity, preserving the specific properties materials, like the ordered pore structure, large specific surface area and high porosity, making them suitable for selective uptake of guest species in drug loading applications. Specifically, the obtained materials had cylindrical pores, specific surface areas up to 1101 m 2 /g and total pore volumes up to 0.473 cm 3 /g. The obtained mesoporous materials are susceptible for further functionalization to improve their selective uptake of guest species in drug delivery applications.

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Section: Small Angle Neutron Scatteringsupporting

confidence: 72%

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

Putz

Wang

Len

et al. 2017

Applied Surface Science

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“…At 120 • C calcination temperature, the scattering curve displays a flat incoherent background at high Q values, which is due to the residual water and organics content of the materials. At low Q, a single power law is seen, which is characteristic of the porous xerogel structures [63][64][65]. There is no evidence on the formation of crystallites, due to their small quantity.…”

Section: Small Angle Neutron Scattering (Sans)mentioning

confidence: 96%

SiO2-PVA-Fe(acac)3 Hybrid Based Superparamagnetic Nanocomposites for Nanomedicine: Morpho-textural Evaluation and In Vitro Cytotoxicity Assay

et al. 2020

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A facile sol-gel route has been applied to synthesize hybrid silica-PVA-iron oxide nanocomposite materials. A step-by-step calcination (processing temperatures up to 400 °C) was applied in order to oxidize the organics together with the iron precursor. Transmission electron microscopy, X-ray diffraction, small angle neutron scattering, and nitrogen porosimetry were used to determine the temperature-induced morpho-textural modifications. In vitro cytotoxicity assay was conducted by monitoring the cell viability by the means of MTT assay to qualify the materials as MRI contrast agents or as drug carriers. Two cell lines were considered: the HaCaT (human keratinocyte cell line) and the A375 tumour cell line of human melanoma. Five concentrations of 10 µg/mL, 30 µg/mL, 50 µg/mL, 100 µg/mL, and 200 µg/mL were tested, while using DMSO (dimethylsulfoxid) and PBS (phosphate saline buffer) as solvents. The HaCaT and A375 cell lines were exposed to the prepared agent suspensions for 24 h. In the case of DMSO (dimethyl sulfoxide) suspensions, the effect on human keratinocytes migration and proliferation were also evaluated. The results indicate that only the concentrations of 100 μg/mL and 200 μg/mL of the nanocomposite in DMSO induced a slight decrease in the HaCaT cell viability. The PBS based in vitro assay showed that the nanocomposite did not present toxicity on the HaCaT cells, even at high doses (200 μg/mL agent).

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“…Materials with H 3 hysteresis do not show any limiting adsorption at high P/Po associated with nonrigid aggregates of plate-like particles and have slit-shaped pores [30]. These particles have a complex porous structure (Figure 2d) with pores of 3.5 nm, resulting from the surfactant assemblies that define the pore structure of the walls [31], as derived from BJH analysis of adsorption-desorption isotherms. Additionally, there is a broad distribution of larger pores related to the lamellar structure unfolding toward the particle surface.…”

Section: Synthesis Of the Hierarchical Meso/macroporous Sio 2 Spheresmentioning

confidence: 98%

TiO₂ Nanoparticles Supported on Hierarchical Meso/Macroporous SiO₂ Spheres for Photocatalytic Applications

Fuentes¹,

Sánchez-Domínguez²,

Bilmes³

2019

Concepts of Semiconductor Photocatalysis

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Supporting a photocatalyst, such as titania nanoparticles (TiO 2 NPs), is a good strategy to improve its performance since it can facilitate the photocatalyst recovery from the aqueous media and provides a high surface area for pollutant adsorption. Among the several advanced functional materials used as TiO 2 NP support, the hierarchical meso/macroporous SiO 2 spheres not only show the advantages associated to its chemical nature but also the dendritic fibrous structure provides a porous network that offers many benefits to be exploited in optical and catalytic devices. In this chapter, different synthetic approaches to design hierarchical meso/macroporous silica and the strategies to support TiO 2 NPs regarding the photocatalytic performance of these materials are shown.

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Pore ordering in mesoporous matrices induced by different directing agents

Cited by 25 publications

References 57 publications

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

SiO2-PVA-Fe(acac)3 Hybrid Based Superparamagnetic Nanocomposites for Nanomedicine: Morpho-textural Evaluation and In Vitro Cytotoxicity Assay

TiO₂ Nanoparticles Supported on Hierarchical Meso/Macroporous SiO₂ Spheres for Photocatalytic Applications

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Pore ordering in mesoporous matrices induced by different directing agents

Cited by 25 publications

References 57 publications

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

Mesoporous silica obtained with methyltriethoxysilane as co-precursor in alkaline medium

SiO2-PVA-Fe(acac)3 Hybrid Based Superparamagnetic Nanocomposites for Nanomedicine: Morpho-textural Evaluation and In Vitro Cytotoxicity Assay

TiO2 Nanoparticles Supported on Hierarchical Meso/Macroporous SiO2 Spheres for Photocatalytic Applications

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TiO₂ Nanoparticles Supported on Hierarchical Meso/Macroporous SiO₂ Spheres for Photocatalytic Applications