Sodium hydroxide catalyzed monodispersed high surface area silica nanoparticles

Bhakta, Snehasis; Dixit, Chandra Kumar; Bist, Itti; Jalil, Karim Abdel; Suib, Steven L.; Rusling, James F.

doi:10.1088/2053-1591/3/7/075025

Cited by 25 publications

(22 citation statements)

References 45 publications

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“…The surface area and the pore volume of the SiO 2 NPs 1:1.5 sample were 63 m 2 g -1 and 0.47 cm 3 g -1 , respectively. We obtained SiO 2 NPs with a surface area more than 2.8 times larger than that obtained by Bhakta et al 36 for the Stober-NPs sample. These results showed an increase in the superficial area (sugarcane waste ash has a surface area of 5 m 2 g -1 ) of more than 12 times, which is considered a very important aspect in the application of adsorbents.…”

Section: Characterization Of Sio 2 Npscontrasting

confidence: 55%

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

Rovani¹,

Santos²,

Cório³

et al. 2019

J. Braz. Chem. Soc.

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Sugarcane waste ash, a Si-rich waste product, is generated in large quantities and creates a serious disposal problem in the Brazilian ethanol-sugar industry, affecting the environment and public health. Here, a simple method capable of generating bare silica nanoparticles utilizing this residue is demonstrated. Firstly, the crystalline silica present in sugarcane waste ash (SWA) was converted into amorphous by melting a mixture of sodium hydroxide and SWA at 550 °C for 1 h. The silica nanoparticles (SiO 2 NPs) were formed by lowing pH. This production process of SiO 2 NPs from SWA was optimized varying the ash:NaOH mass ratio, increasing the silica extraction up to 96%. The sample's composition was characterized by total X-ray fluorescence spectroscopy, morphology and physical-chemical properties were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction, specific surface area measurements, Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA), followed by use as adsorbent for the removal of methylene blue dye. With this process of extraction, nanoparticles smaller than 100 nm were generated, with a surface area of 63 m 2 g-1 and a maximum adsorption capacity of 37 mg g-1 for methylene blue. The results indicate a successful process for obtaining an adsorbent from an industrial waste product using a cost effective and rapid synthesis procedure rendering renewable product.

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Section: Characterization Of Sio 2 Npscontrasting

confidence: 55%

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

Rovani¹,

Santos²,

Cório³

et al. 2019

J. Braz. Chem. Soc.

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“…The hydroxyl ions have a strong nucleophilicity to attack the silicon atom of TEOS as it carries the highest positive charge and therefore becomes the target [20]. Typically condensation nucleation occurs under mild to extreme alkaline conditions [21,22].…”

Section: Formulation Process and Microcapsule Qualitymentioning

confidence: 99%

“…This core distribution may be in micronised particle form or particles with a substantial fraction of the microcapsule itself [24]. From the view of applications, the advantage of these matrix microcapsules is the ruggedness where the dissolution properties are less likely to be either affected or altered by the abrasion or pressure [25], whereas the core-shell capsule would suggest a higher CO 2 loading capacity on the other hand [20,21].…”

Section: Formulation Process and Microcapsule Qualitymentioning

confidence: 99%

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Encapsulation of 2-amino-2-methyl-1-propanol with tetraethyl orthosilicate for CO2 capture

Rama

Zhang

Tchuenbou-Magaia

et al. 2019

Front. Chem. Sci. Eng.

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Carbon capture is widely recognised as an essential strategy to meet global goals for climate protection. Although various CO 2 capture technologies including absorption, adsorption and membrane exist, they are not yet mature for post-combustion power plants mainly due to high energy penalty. Hence researchers are concentrating on developing non-aqueous solvents like ionic liquids, CO 2-binding organic liquids, nanoparticle hybrid materials and microencapsulated sorbents to minimize the energy consumption for carbon capture. This research aims to develop a novel and efficient approach by encapsulating sorbents to capture CO 2 in a cold environment. The conventional emulsion technique was selected for the microcapsule formulation by using 2-amino-2-methyl-1-propanol (AMP) as the core sorbent and silicon dioxide as the shell. This paper reports the findings on the formulated microcapsules including key formulation parameters, microstructure, size distribution and thermal cycling stability. Furthermore, the effects of microcapsule quality and absorption temperature on the CO 2 loading capacity of the microcapsules were investigated using a self-developed pressure decay method. The preliminary results have shown that the AMP microcapsules are promising to replace conventional sorbents.

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“…In this first ever report of creating epoxy-functionalized silica nanoparticles (EfSiNP) in a single pot process (Scheme 1), we have synthesized EfSiNPs by customized modification of 'Bhakta method', which is our published novel approach [20] and employed it for rapid bioconjugation and assay applications. Previously, Ishimura's group synthesized one pot epoxy NPs by precipitating epoxy silane alone under different Stöber formulations [21].…”

Section: Introductionmentioning

confidence: 99%

Novel epoxy-silica nanoparticles to develop non-enzymatic colorimetric probe for analytical immuno/bioassays

Dixit

Bhakta

Macharia

et al. 2018

Analytica Chimica Acta

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We have developed a novel method to develop epoxy silica nanoparticles (EfSiNP) in a single pot. High surface coverage of epoxy functional groups between 150 and 57000 molecules per particles (∼10-10 molecules/mL of 200 nm EfSiNPs) was achieved for different preparation conditions. We then created a red colored probe by conjugating Fuchsin dye to the epoxy functionalities of EfSINPs. Anti-mouse IgG was co-immobilized with Fuchsin and their ratios were optimized for achieving optimum ratios by testing those in functional assays. Dye to antibody ratios were in good negative correlation with a coefficient of -1.00 measured at a confidence level of over 99%. We employed the developed non-enzymatic colorimetric immunonanoprobe for detecting mouse IgG in a direct immunoassay format. We achieved a sensitivity of 427 pg/mL with the assay.

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Sodium hydroxide catalyzed monodispersed high surface area silica nanoparticles

Cited by 25 publications

References 45 publications

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

Encapsulation of 2-amino-2-methyl-1-propanol with tetraethyl orthosilicate for CO2 capture

Novel epoxy-silica nanoparticles to develop non-enzymatic colorimetric probe for analytical immuno/bioassays

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