A Direct Sol‐Gel Synthesis Method for Incorporation of Transition Metals into the Framework of Ordered Mesoporous Materials

2005 ◽  
Vol 26 (1) ◽  
pp. 95-104 ◽  
Author(s):  
Wilhelm R. Glomm ◽  
Torbjørn Vrålstad ◽  
Gisle Øye ◽  
Michael Stöcker ◽  
Johan Sjöblom
Keyword(s):  
Transition Metals ◽  
Mesoporous Materials ◽  
Sol Gel ◽  
Synthesis Method ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Sol Gel Synthesis

Synthesis and Characterization of Vitamin Encapsulated Mesoporous Silica with TEOS

2008 ◽  
Vol 3 ◽  
pp. 89-96 ◽  
Author(s):  
Chang Woo Kim ◽  
Young Hwan Kim ◽  
Hyun Gil Cha ◽  
Young Chul Han ◽  
Young Soo Kang
Keyword(s):  
Mesoporous Silica ◽  
Mesoporous Materials ◽  
Sol Gel ◽  
Molar Ratio ◽  
Confined Space ◽  
Ordered Mesoporous Materials ◽  
Large Molecules ◽  
Ordered Mesoporous ◽  
Sol Gel Process ◽  
Potential Applications

In the past decades, porous materials have attracted great scientific and industrial interest due to their appealing structures and potential applications in separation, purification, catalysis, devices, and so forth. The developing community of ordered mesoporous materials has carried on this exploration of the mesoscopical territory, which promises their unique capacities related to large molecules and their transportation in confined space. Thus rational control and adjustment of pores have been continually focused during the synthesis of ordered mesoporous materials with diverse intrinsic properties. In this work, vitamin C encapsulated mesoporous silica was successfully synthesized with tetraethylorthosilicate (TEOS). TEOS was subjected to sol-gel process in the presence of cetyltrimethylammonium bromide (CTAB). The composition and size of mesoporous silica was controlled by fitting the molar ratio of starting materials. The mesoporous silica can be applied to the field of the cosmetics and bio-medicine as drug delivery.

The Sol–Gel Production of Bioceramics

2008 ◽  
Vol 391 ◽  
pp. 141-158 ◽  
Author(s):  
Antonio J. Salinas ◽  
Maria Vallet-Regí
Keyword(s):  
Mesoporous Materials ◽  
Calcium Phosphates ◽  
Inorganic Compounds ◽  
Sol Gel ◽  
Thermal Conditions ◽  
Biologically Active ◽  
Added Value ◽  
Bioactive Materials ◽  
Ordered Mesoporous Materials ◽  
Sol Gel Synthesis

Sol–gel synthesis is used for the fabrication of new materials with technological applications including ceramics for implants manufacturing, usually termed bioceramics. Many bioactive and resorbable bioceramics, that is, calcium phosphates, glasses and glass–ceramics, have been improved by using the sol–gel synthesis. In addition, the soft thermal conditions of sol–gel methods made possible to synthesize more reactive materials than those synthesized by traditional methods. Moreover, new families of bioactive materials such as organic–inorganic hybrids and inorganic compounds with ordered mesostructure can be produced. In hybrid materials, the inorganic component ensures the bioactive response whereas the organic polymeric component allows modulating other properties of the resulting biomaterial such as mechanical properties, degradation, etc. On the other hand, the sol–gel processes also allow the synthesis of silica ordered mesoporous materials, which are bioactive and exhibit – as an added value – a possible application as matrices for the controlled release of biologically active molecules (drugs, peptides, hormones, etc.). Finally, by combining the bioactive glasses composition with synthesis strategies of mesoporous materials, template glasses with ordered mesoporosity can be obtained. In this chapter, the advances that sol–gel technology has brought to the silica-based bioactive bioceramics are presented.

scholarly journals Controlling Particle Morphology and Pore Size in the Synthesis of Ordered Mesoporous Materials

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4909
Author(s):  
Yaregal Awoke ◽  
Yonas Chebude ◽  
Isabel Díaz
Keyword(s):  
Pore Size ◽  
Mesoporous Materials ◽  
Rational Design ◽  
Amorphous Material ◽  
Synthesis Method ◽  
Short Channel ◽  
Periodic Mesoporous Organosilica ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Short Channels

Ordered mesoporous materials have attracted considerable attention due to their potential applications in catalysis, adsorption, and separation technologies, as well as biomedical applications. In the present manuscript, we aim at a rational design to obtain the desired surface functionality (Ti and/or hydrophobic groups) while obtaining short channels (short diffusion paths) and large pore size (>10 nm). Santa Barbara Amorphous material SBA-15 and periodic mesoporous organosilica PMO materials are synthesized using Pluronic PE 10400 (P104) surfactant under mild acidic conditions to obtain hexagonal platelet-like particles with very short mesochannels (300–450 nm). The use of expanders, such as 1, 3, 5-trimethylbenzene (TMB) and 1, 3, 5-triisopropylbenzene (TIPB) were tested in order to increase the pore size. TMB yielded in the formation of vesicles in all the syntheses attempted, whereas P104 combined with TIPB resulted both in expanded (E) E-SBA-15 and E-PMO with 12.3 nm pore size short channel particles in both cases. Furthermore, the synthesis method was expanded to the incorporation of small amount of Ti via co-condensation method using titanocene as titanium source. As a result, Ti-E-SBA-15 was obtained with 15.5 nm pore size and isolated Ti-sites maintaining platelet hexagonal morphology. Ti-PMO was obtained with 7.8 nm and short channels, although the pore size under the tried synthesis conditions could not be expanded further without losing the structural ordering.

scholarly journals Aqueous Sol-Gel Synthesis of Different Iron Ferrites: From 3D to 2D

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1554
Author(s):  
Justinas Januskevicius ◽  
Zivile Stankeviciute ◽  
Dalis Baltrunas ◽  
Kęstutis Mažeika ◽  
Aldona Beganskiene ◽  
...  
Keyword(s):  
Magnetic Measurements ◽  
Substrate Surface ◽  
Sol Gel ◽  
Synthesis Method ◽  
Xrd Analysis ◽  
Dip Coating ◽  
Yttrium Iron ◽  
Iron Garnet ◽  
Dip Coating Technique ◽  
Sol Gel Synthesis

In this study, an aqueous sol-gel synthesis method and subsequent dip-coating technique were applied for the preparation of yttrium iron garnet (YIG), yttrium iron perovskite (YIP), and terbium iron perovskite (TIP) bulk and thin films. The monophasic highly crystalline different iron ferrite powders have been synthesized using this simple aqueous sol-gel process displaying the suitability of the method. In the next step, the same sol-gel solution was used for the fabrication of coatings on monocrystalline silicon (100) using a dip-coating procedure. This resulted, likely due to substrate surface influence, in all coatings having mixed phases of both garnet and perovskite. Thermogravimetric (TG) analysis of the precursor gels was carried out. All the samples were investigated by X-ray powder diffraction (XRD) analysis. The coatings were also investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM) and Mössbauer spectroscopy. Magnetic measurements were also carried out.

scholarly journals Sol-Gel Synthesis of the Double Perovskite Sr2FeMoO6 by Microwave Technique

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3876
Author(s):  
Jesús Valdés ◽  
Daniel Reséndiz ◽  
Ángeles Cuán ◽  
Rufino Nava ◽  
Bertha Aguilar ◽  
...  
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Microwave Radiation ◽  
Structural Characteristics ◽  
Sol Gel ◽  
Synthesis Method ◽  
Double Perovskite ◽  
Synthesis Methods ◽  
X Ray ◽  
Sol Gel Synthesis

The effect of microwave radiation on the hydrothermal synthesis of the double perovskite Sr2FeMoO6 has been studied based on a comparison of the particle size and structural characteristics of products from both methods. A temperature, pressure, and pH condition screening was performed, and the most representative results of these are herein presented and discussed. Radiation of microwaves in the hydrothermal synthesis method led to a decrease in crystallite size, which is an effect from the reaction temperature. The particle size ranged from 378 to 318 nm when pH was 4.5 and pressure was kept under 40 bars. According to X-ray diffraction (XRD) results coupled with the size-strain plot method, the product obtained by both synthesis methods (with and without microwave radiation) have similar crystal purity. The Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques showed that the morphology and the distribution of metal ions are uniform. The Curie temperature obtained by thermogravimetric analysis indicates that, in the presence of microwaves, the value was higher with respect to traditional synthesis from 335 K to 342.5 K. Consequently, microwave radiation enhances the diffusion and nucleation process of ionic precursors during the synthesis, which promotes a uniform heating in the reaction mixture leading to a reduction in the particle size, but keeping good crystallinity of the double perovskite. Precursor phases and the final purity of the Sr2FeMoO6 powder can be controlled via hydrothermal microwave heating on the first stages of the Sol-Gel method.

Heterogeneous Nucleation of Ordered Mesoporous Materials

1994 ◽  
Vol 371 ◽  
Author(s):  
Jun Liu ◽  
Jud W. Virden ◽  
Anthony Y. Kim ◽  
Bruce C. Bunker
Keyword(s):  
Mesoporous Materials ◽  
Heterogeneous Nucleation ◽  
Colloidal Particles ◽  
Co Adsorption ◽  
Surfactant Solution ◽  
Nucleation Process ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous ◽  
Ceramic Precursors ◽  
Heterogenous Nucleation

AbstractRecently we proposed that heterogenous nucleation is an important phenomenon for the preparation of ordered mesoporous materials. In this paper we further investigate the effect of colloidal particles on the nucleation process of mesoporous materials. Based on the change of the electrical mobilities of the particles in the surfactant solution, we suggest that the adsorption and co-adsorption of surfactant and ceramic precursors changes local structural and chemistry on the particle surfaces, and favors the nucleation events within these regions.

Ordered Mesoporous Materials from Metal Nanoparticle-Block Copolymer Self-Assembly

Science ◽  
2008 ◽  
Vol 320 (5884) ◽  
pp. 1748-1752 ◽  
Author(s):  
S. C. Warren ◽  
L. C. Messina ◽  
L. S. Slaughter ◽  
M. Kamperman ◽  
Q. Zhou ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Mesoporous Materials ◽  
Self Assembly ◽  
Metal Nanoparticle ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous

scholarly journals Batteries: Nanostructural Uniformity of Ordered Mesoporous Materials: Governing Lithium Storage Behaviors (Small 43/2018)

Small ◽  
2018 ◽  
Vol 14 (43) ◽  
pp. 1870197
Author(s):  
Gwi Ok Park ◽  
Jeongbae Yoon ◽  
Su Bin Park ◽  
Zhenghua Li ◽  
Yun Seok Choi ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Lithium Storage ◽  
Ordered Mesoporous Materials ◽  
Ordered Mesoporous
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