Facile ultrasound-assisted grafting of silica gel by aminopropyltriethoxysilane for aldol condensation of furfural and acetone

Sosa, Narongrit; Chanlek, Narong; Wittayakun, Jatuporn

doi:10.1016/j.ultsonch.2019.104857

Cited by 19 publications

(24 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…70 This phenomenon is specially noted over the sonication step. 74,75 For the same reasons as described before for 110 nm SiO 2 NPs, the Z data of our sensor were probably not affected by this aggregation of 270 nm nanoparticles in ethanol. Their PDI values after 1.0 and 24.0 h of synthesis were 0.04 ± 0.03 and 0.01 ± 0.01, respectively.…”

Section: ■ Experimental Sectionsupporting

confidence: 54%

Real-Time and In Situ Monitoring of the Synthesis of Silica Nanoparticles

et al. 2022

View full text Add to dashboard Cite

The real-time and in situ monitoring of the synthesis of nanomaterials (NMs) remains a challenging task, which is of pivotal importance by assisting fundamental studies (e.g., synthesis kinetics and colloidal phenomena) and providing optimized quality control. In fact, the lack of reproducibility in the synthesis of NMs is a bottleneck against the translation of nanotechnologies into the market toward daily practice. Here, we address an impedimetric millifluidic sensor with data processing by machine learning (ML) as a sensing platform to monitor silica nanoparticles (SiO2NPs) over a 24 h synthesis from a single measurement. The SiO2NPs were selected as a model NM because of their extensive applications. Impressively, simple ML-fitted descriptors were capable of overcoming interferences derived from SiO2NP adsorption over the signals of polarizable Au interdigitate electrodes to assure the determination of the size and concentration of nanoparticles over synthesis while meeting the trade-off between accuracy and speed/simplicity of computation. The root-mean-square errors were calculated as ∼2.0 nm (size) and 2.6 × 1010 nanoparticles mL–1 (concentration). Further, the robustness of the ML size descriptor was successfully challenged in data obtained along independent syntheses using different devices, with the global average accuracy being 103.7 ± 1.9%. Our work advances the developments required to transform a closed flow system basically encompassing the reactional flask and an impedimetric sensor into a scalable and user-friendly platform to assess the in situ synthesis of SiO2NPs. Since the sensor presents a universal response principle, the method is expected to enable the monitoring of other NMs. Such a platform may help to pave the way for translating “sense–act” systems into practice use in nanotechnology.

show abstract

Section: ■ Experimental Sectionsupporting

confidence: 54%

Real-Time and In Situ Monitoring of the Synthesis of Silica Nanoparticles

et al. 2022

View full text Add to dashboard Cite

show abstract

“…This is due to the dehydration of silica gel. 33 − 35 Within a temperature range of 123–1000 °C, the TG curve showed a significant downward trend with a weight loss ratio of 10.7% and no significant peak temperature on the DTG curve. This suggested that silica gel dehydration also occurred in this temperature range.…”

Section: Resultsmentioning

confidence: 97%

Insights into Coproduction of Silica Gel via Desulfurization of Steel Slag and Silica Gel Adsorption Performance

Liao

Pan

et al. 2022

ACS Omega

View full text Add to dashboard Cite

Steel slag is a calcium-containing alkaline industrial solid waste that can replace limestone for flue gas desulfurization. It can remove SO 2 and coproduce silica gel while avoiding CO 2 emission from limestone in the desulfurization process. In this study, steel slag with a D 50 of 3.15 μm was used to remove SO 2 . At room temperature, with a solid–liquid ratio of 1:10, a stirring speed of 800 rpm, and the mixed gas introduced at a flow rate of 0.8 mL/min, 1 ton of steel slag could remove 406.7 kg of SO 2 , a SO 2 removal efficiency typical of existing calcium-rich desulfurizers. As limestone desulfurization can release CO 2 , when limestone desulfurization was replaced with steel slag of equal desulfurization ratio, CO 2 emissions could be reduced by 279.6 kg and limestone could be reduced by 635.5 kg. The yield of silica gel was 5.1%. Silica gel pore structure parameters were close to those of commercially available B silica gel. Products after desulfurization were mainly CaSO 4 · 2H 2 O, CaSO 4 · 0.5H 2 O, CaSO 3 · 0.5H 2 O, and silica gel. With a silica gel dosage of 30 mg, a temperature of 20 °C, a pH value of 6.00, a stirring time of 0.5 h, and a methylene blue concentration of 0.020 mg/mL, the removal ratio of methylene blue adsorbed by silica gel was 98.4%.

show abstract

“…However, the shape of peaks of both N 1s and C 1s was in good agreement with data found in the literature regarding APTES-functionalized surfaces. 75 , 76 The deconvolution of N 1s spectra ( Figure S17 ) suggested surface species including C–NH 2 and C–NH 3 + . 76 The amine group (C–NH 2 ) was dominant in both samples.…”

Section: Resultsmentioning

confidence: 99%

“… 75 , 76 The deconvolution of N 1s spectra ( Figure S17 ) suggested surface species including C–NH 2 and C–NH 3 + . 76 The amine group (C–NH 2 ) was dominant in both samples.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Mesoporous Silica Nanorods Loaded with Ceria and Functionalized with Fluorophores for Multimodal Imaging

Grzelak

Gàzquez

Grayston

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Multifunctional magnetic nanocomposites based on mesoporous silica have a wide range of potential applications in catalysis, biomedicine, or sensing. Such particles combine responsiveness to external magnetic fields with other functionalities endowed by the agents loaded inside the pores or conjugated to the particle surface. Different applications might benefit from specific particle morphologies. In the case of biomedical applications, mesoporous silica nanospheres have been extensively studied while nanorods, with a more challenging preparation, have attracted much less attention despite the positive impact on the therapeutic performance shown by seminal studies. Here, we report on a sol–gel synthesis of mesoporous rodlike silica particles of two distinct lengths (1.4 and 0.9 μm) and aspect ratios (4.7 and 2.2) using Pluronic P123 as a structure-directing template and rendering ∼1 g of rods per batch. Iron oxide nanoparticles have been synthesized within the pores yielding maghemite (γ-Fe 2 O 3 ) nanocrystals of elongated shape (∼7 nm × 5 nm) with a [110] preferential orientation along the rod axis and a superparamagnetic character. The performance of the rods as T 2 -weighted MRI contrast agents has also been confirmed. In a subsequent step, the mesoporous silica rods were loaded with a cerium compound and their surface was functionalized with fluorophores (fluorescamine and Cyanine5) emitting at λ = 525 and 730 nm, respectively, thus highlighting the possibility of multiple imaging modalities. The biocompatibility of the rods was evaluated in vitro in a zebrafish ( Danio rerio ) liver cell line (ZFL), with results showing that neither long nor short rods with magnetic particles caused cytotoxicity in ZFL cells for concentrations up to 50 μg/ml. We advocate that such nanocomposites can find applications in medical imaging and therapy, where the influence of shape on performance can be also assessed.

show abstract

Facile ultrasound-assisted grafting of silica gel by aminopropyltriethoxysilane for aldol condensation of furfural and acetone

Cited by 19 publications

References 33 publications

Real-Time and In Situ Monitoring of the Synthesis of Silica Nanoparticles

Real-Time and In Situ Monitoring of the Synthesis of Silica Nanoparticles

Insights into Coproduction of Silica Gel via Desulfurization of Steel Slag and Silica Gel Adsorption Performance

Magnetic Mesoporous Silica Nanorods Loaded with Ceria and Functionalized with Fluorophores for Multimodal Imaging

Contact Info

Product

Resources

About