Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
8.5
4.4
Journals
Nanomaterials
Special Issues
Synthesis and Application of Silicon Dioxide Nanoparticles
share announcement

Synthesis and Application of Silicon Dioxide Nanoparticles

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 21382

Special Issue Editor

Prof. Dr. Antonio S. Araujo

E-Mail Website
Guest Editor
Institute of Chemistry, Federal University of Rio Grande do Norte, Natal 59078-970, RN, Brazil
Interests: nanoporous silica; hydrothermal synthesis; mechanochemisty; thermal analysis; catalysis; petroleum and petrochemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recently, silica-based nanomaterials have been attracted great interest in both fundamental and applied research. They can be produced in a variety of sizes, pores and shapes. Depending of the synthesis strategies and functionalization methods, their surface properties can be easily adjusted for several purposes. Silica nanoparticles can be obtained from several methods, including wet chemical, sol-gel, hydrothermal, and most recently, mechanochemical synthesis methods. In nonporous form, silica nanoparticles are used as abrasives and absorbents. Therefore, meso- and macro-porous silicas with ordered structures have great potential in several applications, such as catalysis, adsorption, nanomedicine, biotechnology and pharmaceutical technology (drug delivery), and electrochemistry (sensors and supercapacitors). In the petrochemistry and petroleum industries, silica nanoparticles (SiNPs) can be used in refining catalysts, energy conversion, gas storage and environmental applications.

This Special Issue of Nanomaterials is seeking contributions in the form of communications, research articles and reviews, in order to provide an update on current knowledge of the fundamentals, theory and computational methods, new applications and perspectives related to silica nanoparticles.

Thus, the scope of this Special Issue on Synthesis and Applications of Silica Nanoparticles will include, but is not limited, to the following topics: synthesis and functionalization; mechanochemical synthesis and surface modification; meso- and macro-porous silicas; hierarchically porous silica materials; characterization from thermal analysis, X-ray, infrared spectroscopy, scanning and transmission electron microscopy; catalysis and adsorption; applications of silica nanoparticles to biotechnology, chemicals and pharmaceutics, biomedicine, petroleum and the petrochemical industry, gas capture and storage, and environmental processes.

We look forward to receiving your contributions.

Prof. Dr. Antonio S. Araujo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • synthesis, characterization and functionalization
  • mechanochemical synthesis
  • hierarchically structured materials
  • adsorption and catalysis
  • composites, bio-inspired, layered silica
  • theory, computational and modeling investigations
  • electrochemistry, sensors and supercapacitors
  • energy conversion and storage
  • pharmaceuticals and drug delivery
  • biomaterials and biomedical applications
  • environmental applications

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue polices can be found here.

Published Papers (8 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

13 pages, 3998 KiB  
Article
Synthesis and Characterization of Erbium-Doped Silica Films Obtained by an Acid–Base-Catalyzed Sol–Gel Process
by Ali Abdullah, El Mostafa Benchafia, Daniel Choi and Sufian Abedrabbo
Nanomaterials 2023, 13(9), 1508; https://doi.org/10.3390/nano13091508 - 28 Apr 2023
Cited by 4 | Viewed by 1883
Abstract
Erbium-doped silica films were synthesized using a two-step sol–gel methodology that involved acid and base catalysts, with erbium concentration ranging from 0.2% to 6% and annealing temperatures varying from 500 °C to 900 °C. The photoluminescence spectra showed that the samples exhibiting efficient [...] Read more.
Erbium-doped silica films were synthesized using a two-step sol–gel methodology that involved acid and base catalysts, with erbium concentration ranging from 0.2% to 6% and annealing temperatures varying from 500 °C to 900 °C. The photoluminescence spectra showed that the samples exhibiting efficient emission were annealed at 800 °C and 900 °C and doped with 3% and 6% erbium. The X-ray diffraction analysis revealed that the internal structure of the films was influenced by the different annealing temperatures and the doping concentrations. Samples with dominant 4f transitions were modelled. The results suggest that the proposed method is a promising approach for the synthesis of erbium-doped silica films with potential applications in optical devices. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Graphical abstract

19 pages, 4356 KiB  
Article
Comparative Study of Commercial Silica and Sol-Gel-Derived Porous Silica from Cornhusk for Low-Temperature Catalytic Methane Combustion
by Clement Owusu Prempeh, Ingo Hartmann, Steffi Formann, Manfred Eiden, Katja Neubauer, Hanan Atia, Alexander Wotzka, Sebastian Wohlrab and Michael Nelles
Nanomaterials 2023, 13(9), 1450; https://doi.org/10.3390/nano13091450 - 24 Apr 2023
Cited by 2 | Viewed by 2340
Abstract
The synthesis and characterization of sol-gel-derived cornhusk support for low-temperature catalytic methane combustion (LTCMC) were investigated in this study. The prepared cornhusk support was impregnated with palladium and cerium oxide (Pd/CeO2) via the classical incipient wetness method. The resulting catalyst was [...] Read more.
The synthesis and characterization of sol-gel-derived cornhusk support for low-temperature catalytic methane combustion (LTCMC) were investigated in this study. The prepared cornhusk support was impregnated with palladium and cerium oxide (Pd/CeO2) via the classical incipient wetness method. The resulting catalyst was characterized using various techniques, including X-ray diffraction (XRD), N2 physisorption (BET), transmission electron microscopy (TEM), and hydrogen temperature-programmed reduction (H2-TPR). The catalytic performance of the Pd/CeO2/CHSiO2 catalyst was evaluated for methane combustion in the temperature range of 150–600 °C using a temperature-controlled catalytic flow reactor, and its performance was compared with a commercial catalyst. The results showed that the Pd/CeO2 dispersed on SiO2 from the cornhusk ash support (Pd/CeO2/CHSiO2) catalyst exhibited excellent catalytic activity for methane combustion, with a conversion of 50% at 394 °C compared with 593 °C for the commercial silica catalyst (Pd/CeO2/commercial). Moreover, the Pd/CeO2/CHSiO2 catalyst displayed better catalytic stability after 10 h on stream, with a 7% marginal loss in catalytic activity compared with 11% recorded for the Pd/CeO2/commercial catalyst. The N2 physisorption and H2-TPR results indicated that the cornhusk SiO2 support possessed a higher surface area and strong reducibility than the synthesized commercial catalyst, contributing to the enhanced catalytic activity of the Pd/CeO2/SiO2 catalyst. Overall, the SiO2 generated from cornhusk ash exhibited promising potential as a low-cost and environmentally friendly support for LTCMC catalysts. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Figure 1

13 pages, 2745 KiB  
Article
Fumed Silica-Based Ultra-High-Purity Synthetic Quartz Powder via Sol–Gel Process for Advanced Semiconductor Process beyond Design Rule of 3 nm
by Ji-Ho Choi, Woo-Guk Lee, Tae-Hun Shim and Jea-Gun Park
Nanomaterials 2023, 13(3), 390; https://doi.org/10.3390/nano13030390 - 18 Jan 2023
Viewed by 3939
Abstract
Fumed silica-based ultra-high-purity synthetic quartz powder was developed via the sol–gel process to apply to quartz wares and quartz crucibles for use in advanced semiconductor processes. The process conditions of preparing potassium silicate solution, gelation, and cleaning were optimized, i.e., the relative ratio [...] Read more.
Fumed silica-based ultra-high-purity synthetic quartz powder was developed via the sol–gel process to apply to quartz wares and quartz crucibles for use in advanced semiconductor processes. The process conditions of preparing potassium silicate solution, gelation, and cleaning were optimized, i.e., the relative ratio of fumed silica (10 wt%) to KOH (4 wt%) for potassium silicate solution, gelation time 3 h, and cleaning for 1 h with 5 wt% HCl solution. It was observed that the gelation time strongly affected the size distribution of the quartz powder; i.e., a longer gelation time led to a larger size (d50) of the synthesized quartz powder: 157 μm for 2 h and 331 μm for 5 h. In particular, it was found that the morphology of the as-synthesized quartz powder greatly depended on the pulverizing process; i.e., the shape of quartz powder was shown to be rod-shaped for the without-gel-pulverizing process and granular-shaped with the process. We expect that the fumed silica-based ultra-high-purity quartz powder with an impurity level of 74.1 ppb synthesized via the sol–gel process is applicable as a raw material for quartz wares and crucibles for advanced semiconductor processes beyond the design rule of 3 nm. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Figure 1

21 pages, 8672 KiB  
Article
Hydrothermal Synthesis and Properties of Nanostructured Silica Containing Lanthanide Type Ln–SiO2 (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu)
by Joana M. F. Barros, Glauber J. T. Fernandes, Marcio D. S. Araujo, Dulce M. A. Melo, Amanda D. Gondim, Valter J. Fernandes, Jr. and Antonio S. Araujo
Nanomaterials 2023, 13(3), 382; https://doi.org/10.3390/nano13030382 - 18 Jan 2023
Cited by 4 | Viewed by 1919
Abstract
The nanostructured lanthanide-silica materials of the Ln–SiO2 type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source [...] Read more.
The nanostructured lanthanide-silica materials of the Ln–SiO2 type (Ln = La, Ce, Pr, Nd, Eu, Gd, Dy, Yb, Lu) were synthesized by the hydrothermal method at 100 °C, using cetyltrimethylammonium as a structural template, silica gel and sodium silicate as a source of silicon, and lanthanide oxides, with Si/Ln molar ratio = 50. The resulting materials were calcined at 500 °C using nitrogen and air, and characterized by X-ray diffraction (XRD), Fourier-Transform infrared absorption spectroscopy, scanning electron microscopy, thermogravimetry (TG), surface area by the BET method and acidity measurements by n-butylamine adsorption. The XRD and chemical analysis indicated that the SiO2 presented a hexagonal structure and the incorporation of lanthanides in the structure changes the properties of the Ln–SiO2 materials. The heavier the lanthanide element, the higher the Si/Ln ratio. The TG curves showed that the decomposition of the structural template occurs in the materials at temperatures below 500 °C. The samples showed variations in specific surface area, mean pore diameter and silica wall thickness, depending on the nature of the lanthanide. The incorporation of different lanthanides in the silica generated acid sites of varied strength. The hydrothermal stability of the Ln–SiO2 materials evaluated at high temperatures, evidenced that the properties can be controlled for application in adsorption and catalysis processes. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Figure 1

22 pages, 6406 KiB  
Article
Particles’ Organization in Direct Oil-in-Water and Reverse Water-in-Oil Pickering Emulsions
by Diego M. Ramos, Véronique Sadtler, Philippe Marchal, Cécile Lemaitre, Frédérick Niepceron, Lazhar Benyahia and Thibault Roques-Carmes
Nanomaterials 2023, 13(3), 371; https://doi.org/10.3390/nano13030371 - 17 Jan 2023
Cited by 5 | Viewed by 2330
Abstract
This paper addresses the impact of the particle initial wetting and the viscosity of the oil phase on the structure and rheological properties of direct (Oil/Water) and reverse (Water/Oil) Pickering emulsions. The emulsion structure was investigated via confocal microscopy and static light scattering. [...] Read more.
This paper addresses the impact of the particle initial wetting and the viscosity of the oil phase on the structure and rheological properties of direct (Oil/Water) and reverse (Water/Oil) Pickering emulsions. The emulsion structure was investigated via confocal microscopy and static light scattering. The flow and viscoelastic properties were probed by a stress-controlled rheometer. Partially hydrophobic silica particles have been employed at 1 and 4 wt.% to stabilize dodecane or paraffin-based emulsions at 20 vol.% of the dispersed phase. W/O emulsions were obtained when the particles were dispersed in the oily phase while O/W emulsions were prepared when the silica was introduced in the aqueous phase. We demonstrated that, although the particles adsorbed at the droplets interfaces for all the emulsions, their organization, the emulsion structure and their rheological properties depend in which phase they were previously dispersed in. We discuss these features as a function of the particle concentration and the oil viscosity. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Graphical abstract

19 pages, 4893 KiB  
Article
Synthesis, Characterization and Photocatalytic Activity of CoFe2O4/Fe2O3 Dispersed in Mesoporous KIT-6
by Johnatan de Oliveira Soares, Wesley Eulálio Cabral Cavalcanti, Marco Antonio Morales Torres, Sibele Berenice Castella Pergher, Fernando José Volpi Eusébio De Oliveira and Tiago Pinheiro Braga
Nanomaterials 2022, 12(20), 3566; https://doi.org/10.3390/nano12203566 - 12 Oct 2022
Cited by 5 | Viewed by 1998
Abstract
The present work aimed to synthesize and characterize a solid based on CoFe2O4/Fe2O3-KIT-6 and evaluate its performance in the photocatalytic degradation of the remazol red ultra RGB dye. By analyzing XRD, N2 physisorption, and [...] Read more.
The present work aimed to synthesize and characterize a solid based on CoFe2O4/Fe2O3-KIT-6 and evaluate its performance in the photocatalytic degradation of the remazol red ultra RGB dye. By analyzing XRD, N2 physisorption, and Mössbauer results, it was possible to identify that the desired CoFe2O4/Fe2O3 phase was achieved, which maintained its structural properties. The FTIR-pyridine indicated the presence of Lewis acid sites, while TPD-CO2 showed a large amount of weak basic sites. The band-gap energy indicated that the compound can be applied in photocatalytic degradation under UV/visible light, with the possibility of magnetic separation at the end of the reaction. The photocatalysis results indicated that there was complete degradation of the remazol red ultra RGB dye within 1 h of reaction. Despite the absence of H2O2, the combination of the proposed photocatalyst with the anatase phase (TiO2) showed significant improvements in the degradation process. The proposed mechanism for complete dye degradation indicated that a sequence of radical reactions is necessary, generating oxidant species such as •OH and the final products were CO2 and H2O. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Figure 1

13 pages, 1581 KiB  
Article
Synthesis and Characterization of Reproducible Linseed Oil-Loaded Silica Nanoparticles with Potential Use as Oxygen Scavengers in Active Packaging
by Juan Felipe Alvarado, Daniel Fernando Rozo, Luis Miguel Chaparro, Jorge Alberto Medina and Felipe Salcedo-Galán
Nanomaterials 2022, 12(18), 3257; https://doi.org/10.3390/nano12183257 - 19 Sep 2022
Cited by 4 | Viewed by 2449
Abstract
Commercially available oxygen scavengers used to prevent lipid autoxidation, microbial growth and enzymatic browning in food products present several issues, which include the usage of metals and their moisture dependence to work properly. We present the synthesis and characterization of a moisture-independent oil-based [...] Read more.
Commercially available oxygen scavengers used to prevent lipid autoxidation, microbial growth and enzymatic browning in food products present several issues, which include the usage of metals and their moisture dependence to work properly. We present the synthesis and characterization of a moisture-independent oil-based oxygen scavenging system comprised of linseed oil and silica nanoparticles. The system was synthesized via sol-gel chemistry and was characterized using morphological analysis (SEM, AFM, TEM, and N2 adsorption/desorption), oil-loading analysis (TGA), and surface analysis (ζ-potential and ATR-FTIR). Performance of the system was evaluated through headspace measurements and reproducibility of synthetic procedure was verified using six replicates. Nanoparticles showed the desired spherical shape with a diameter of (122.7 ± 42.7 nm) and mesoporosity (pore diameter = 3.66 ± 0.08 nm), with an encapsulation efficiency of 33.9 ± 1.5% and a highly negative ζ-potential (−56.1 ± 1.2 mV) in basic solution. Performance of the system showed a promising high value for oxygen absorption of 25.8 ± 4.5 mL O2/g of encapsulated oil (8.3 ± 1.5 mL O2/g of nanocapsules) through a moisture independent mechanism, which suggests that the synthesized system can be used as an oxygen scavenger in dry atmosphere conditions. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Figure 1

16 pages, 5286 KiB  
Article
Organic-Free Synthesis of Finned Mordenite Zeolite
by Rafael C. Lima, Christian W. Lopes, Jhonny Villarroel-Rocha, Lindiane Bieseki, Karim Sapag and Sibele B. C. Pergher
Nanomaterials 2022, 12(15), 2623; https://doi.org/10.3390/nano12152623 - 29 Jul 2022
Cited by 4 | Viewed by 2048
Abstract
Mordenite is a well-known zeolite widely used for industrial processes. However, its pore architecture can be inconvenient due to diffusional issues. A study of the synthesis parameters from an organic-free dense gel was carried out to control the crystal morphology, which resulted in [...] Read more.
Mordenite is a well-known zeolite widely used for industrial processes. However, its pore architecture can be inconvenient due to diffusional issues. A study of the synthesis parameters from an organic-free dense gel was carried out to control the crystal morphology, which resulted in finned mordenite zeolite particles. The obtained materials were characterized by XRD, FTIR, 29Si and 27Al MAS-NMR, elemental analysis, nitrogen physisorption, SEM, and TEM. We found that careful manipulation of the hydrothermal parameters directly affected the sizes and morphologies of the crystallites and particles, as well as the textural properties of the final products. Additionally, it was found that mordenite could exhibit a fin morphology with additional mesoporosity, which is a promising means to reduce the diffusional problems of one-dimensional-channel zeolites. Full article
(This article belongs to the Special Issue Synthesis and Application of Silicon Dioxide Nanoparticles)
►▼ Show Figures

Graphical abstract

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-8
Back to TopTop