Progress of porous silicon APTES-functionalization by FTIR investigations

Majoul, N.; Aouida, S.; Bessaı̈s, B.

doi:10.1016/j.apsusc.2015.01.107

Cited by 291 publications

(187 citation statements)

References 23 publications

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“…The MCM-41/AP-FFA sample lost 21% of its mass within the same temperature bracket. This result confirms the presence of FFA, counting for 10% variation (Δ) compared to MCM-41/AP [18,34]. …”

Section: Resultssupporting

confidence: 78%

“…In the former sample, four peaks appeared at 1708 cm −1 , 1639 cm −1 , 1531 cm −1 , 1465 cm −1 , and 1412 cm −1 , assigned to the bending of C-N-H bound, O-H vibration, N-H bending, and C-H stretching, respectively (Figure 5a), confirming the presence of APTES [34,35,36]. The last two groups were present in the APTES, confirming that the surface of the MCM-41 was aminated.…”

Section: Resultsmentioning

confidence: 82%

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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: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 82%

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

et al. 2018

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“…For instance, the peaks at 804 and 828 cm −1 correspond to both asymmetric and symmetric stretching vibrations of Si–O–Si . Also, one may observe the vibrational mode of CH 2 group at 871 cm −1 and the deformation mode of the Si–CH 2 peaking at 1410 cm −1 . The 1587 and 1471 cm −1 peaks are assigned to the deformation modes of the amine groups from APTES, which are very strongly hydrogen bonded to the silanol groups to form cyclic structures.…”

Section: Resultsmentioning

confidence: 99%

Novel Gallium Polyoxometalate/Nano‐Gold Hybrid Material Supported on Nano‐sized Silica for Mild Cyclohexene Oxidation Using Molecular Oxygen

Jameel

Chen

et al. 2017

Bulletin Korean Chem Soc

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Selective oxidation of olefins using molecular oxygen is a great challenge. This study reports two types of novel eco‐friendly heterogeneous hybrid catalysts. One comprises of a lacunary Keggin‐type polyoxometalate (POM) GaW11 linked to nano‐sized silica using (3‐aminopropyl) triethoxysilane (APTES) to form GaW11‐APTES@SiO2 . Another catalyst is Au/GaW11‐APTES@SiO2 prepared by wet deposition of nano‐gold on the former one. The catalysts were characterized and used for the solvent‐free oxidation of cyclohexene with molecular oxygen under mild reaction conditions. Both the catalysts showed good conversion and significant selectivity towards oxidized products for cyclohexene. GaW11‐APTES@SiO2 showed a high conversion of up to 62.02% with a selectivity of 59.13% towards epoxide at a mild temperature of 50°C. Au/GaW11‐APTES@SiO2 showed a conversion of 69.32% with 57.34% selectivity to 2‐cyclohexene‐1‐ol at a temperature of 80°C. The heterogeneous catalysts were reused several times with no significant loss in conversion or selectivity towards the oxidized products.

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“…As shown in figure 6(a), the biofunctionalization process results in an uniform fluorescence intensity across the image proving that homogenous biofunctionalized layers are produced on top of the surface of nanoPS. Following this process, amino groups are bonded on the surface of nanoPS by a previous oxidation of the surface, remaining intact most of the O-Si-CH2-CH2-CH2-NH2 groups present in APTS molecules [27,28]. To create selective biofunctionalized platforms, direct laser writing has been previously used [29].…”

Section: Resultsmentioning

confidence: 99%

Nanoporous silicon-based surface patterns fabricated by UV laser interference techniques for biological applications

Recio‐Sánchez

Peláez

Vega

et al. 2016

J. Phys. D: Appl. Phys.

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The fabrication of selectively functionalized micropatterns based on nanostructured porous silicon (nanoPS) by phase mask ultraviolet laser interference is presented here. This singlestep process constitutes a flexible method for the fabrication of surface patterns with tailored properties. These surface patterns consist of alternate regions of almost untransformed nanoPS and areas where nanoPS is transformed into Si nanoparticles (Si NPs) as a result of the laser irradiation process. The size of the transformed areas as well as the diameter of the Si NPs can be straightforwardly tailored by controlling the main fabrications parameters including the porosity of the nanoPS layers, the laser interference period areas, and laser fluence. The surface patterns have been found to be appropriate candidates for the development of selectively-functionalized surfaces for biological applications mainly due to the biocompatibility of the untransformed nanoPS regions.

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Progress of porous silicon APTES-functionalization by FTIR investigations

Cited by 291 publications

References 23 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

Novel Gallium Polyoxometalate/Nano‐Gold Hybrid Material Supported on Nano‐sized Silica for Mild Cyclohexene Oxidation Using Molecular Oxygen

Nanoporous silicon-based surface patterns fabricated by UV laser interference techniques for biological applications

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