Thermal stability and optical property of ormocers (organically modified ceramics) nanoparticles produced from copolymerization between amino-silanes and tetraethoxysilane

Jafarzadeh, Mohammad; Adnan, Rohana; Mazlan, Mohd Khairul Nizam

doi:10.1016/j.jnoncrysol.2012.07.028

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…5(c)), it is easier to form a hydrophobic network for shielding the nanoparticle from water, resulting in a high water contact angle. The thermal gravimetric analysis results of the pristine and functionalised nanoparticles (silane:silica ratio = 200 µL$g -1 for both silanes) show a similar trend for mass loss over a wide range of temperature (100°C to 800°C), which agree with previous studies on the thermal properties of pristine and functionalised silica nanoparticles [34][35][36][37]. The similar mass loss for both pristine and functionalised nanoparticles indicate that the mass of the methyl-and octyl-functional groups is negligible with respect to the mass of the nanoparticle (Fig.…”

Section: Characterisation Of Silica Nanoparticlesupporting

confidence: 90%

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

Chen

Karde

Cheng

et al. 2020

Front. Chem. Sci. Eng.

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Understanding the nature of hydrophobicity has fundamental importance in environmental applications. Using spherical silica nanoparticles (diameter = 369 ± 7 nm) as the model material, the current study investigates the relationship between the alkyl chain network and hydro-phobicity. Two alkyl silanes with different chain length (triethoxymethylsilane (C1) vs. trimethoxy(octyl)silane (C8)) were utilised separately for the functionalisation of the nanoparticles. Water contact angle and inverse gas chromatography results show that the alkyl chain length is essential for controlling hydrophobicity, as the octyl-functionalised nanoparticles were highly hydrophobic (water contact angle = 150.6° ± 6.6°), whereas the methyl-functionalised nanoparticles were hydrophilic (i.e., water contact angle = 0°, similar to the pristine nanoparticles). The homogeneity of the octyl-chain network also has a significant effect on hydrophobicity, as the water contact angle was reduced significantly from 148.4° ± 3.5° to 30.5° ± 1.0° with a methyl-/octyl-silane mixture (ratio = 160:40 µL·g−1 nanoparticles).

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Section: Characterisation Of Silica Nanoparticlesupporting

confidence: 90%

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

Chen

Karde

Cheng

et al. 2020

Front. Chem. Sci. Eng.

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“…2.c. [22,23]. The crystallites size of (Si) can be estimated from diffraction pattern analysis by measuring FWHM and applying Scherrer's equation.…”

Section: Resultsmentioning

confidence: 99%

3D porous silicon (nanorods array, nanosheets, and nanoclusters) production

Nabil¹,

Mahmoud²,

Nomeir

et al. 2019

Egypt. J. Chem.

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I N this research, using powder technology manufacturing is as a pioneering, low cost, a simple and safe method for the fabrication of nano-porous silicon (NPSpowder). It's attractive carriers for targeted in several research fields. It's prepared using a combination of alkali chemical etching process and ultra-sonication technique; through the utilization of commercial silicon powder; with high yield efficiency (81.43%). Several 3D-NPS-shapes (nanorods array, nanosheets, and nanoclusters) are fabricated. It's a mixture of microporous and mesoporous silicon powder {pore size (28-140 nm)}. The main factors which affect the production of NPS-powder are (KOHconc.), sonication time, separation process and drying velocity.

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“…XRD is considered as a reference technique for the product powder characterization [10]. Figure 1(c) (t = 5 hours), the SiO 2 -peak high intensity appeared at 2θ = 20˚ that corresponds to the complete transformation to amorphous-SiO 2 [13]. Then, the preparation conditions during the crystalline-SiO 2 formation are [4.5 and 6 weight % KOH at t = 4 hours].…”

Section: Resultsmentioning

confidence: 99%

Shape Control of Silica Powder Formation

Nabil¹,

Motaweh²

2019

MSCE

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The purpose of the present research is the different morphologies production of crystalline and amorphous-silica powder. It's a basic material for many pharmaceutical and environmental applications as well. And, it's produced using the combination of the alkali chemical etching process and the ultra-sonication technique. The critical preparation conditions are KOH concentration (weight %) and the sonication time (hour). The paper presents the chemical mechanism of the silica particle formation as well as the different morphology. The results show the formation of crystalline and amorphous-porous-silica particles in the micrometer range with the porous order network that has pore sizes range in micrometer too. This synthetic uses commercial silicon, which could be useful for large-scale production. Also, the nano-sphere and nano-cubic shapes of silica powder are formed starting by commercial silicon powder.

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Thermal stability and optical property of ormocers (organically modified ceramics) nanoparticles produced from copolymerization between amino-silanes and tetraethoxysilane

Cited by 19 publications

References 27 publications

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

3D porous silicon (nanorods array, nanosheets, and nanoclusters) production

Shape Control of Silica Powder Formation

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