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Journal articles on the topic 'Mesoporous silica'

Author: Grafiati
Published: 4 June 2021
Last updated: 23 November 2024

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1

Kang, Misun, Jong-tak Lee, and Jae Young Bae. "Facile Mesoporous Hollow Silica Synthesis for Formaldehyde Adsorption." International Journal of Molecular Sciences 24, no. 4 (February 20, 2023): 4208. http://dx.doi.org/10.3390/ijms24044208.

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Formaldehyde emitted from household products is classified as a hazardous substance that can adversely affect human health. Recently, various studies related to adsorption materials for reducing formaldehyde have been widely reported. In this study, mesoporous and mesoporous hollow silicas with amine functional groups introduced were utilized as adsorption materials for formaldehyde. Formaldehyde adsorption characteristics of mesoporous and mesoporous hollow silicas having well-developed pores were compared based on their synthesis methods—with or without a calcination process. Mesoporous hollow silica synthesized through a non-calcination process had the best formaldehyde adsorption characteristics, followed by mesoporous hollow silica synthesized through a calcination process and mesoporous silica. This is because a hollow structure has better adsorption properties than mesoporous silica due to large internal pores. The specific surface area of mesoporous hollow silica synthesized without a calcination process was also higher than that synthesized with a calcination process, leading to a better adsorption performance. This research suggests a facile synthetic method of mesoporous hollow silica and confirms its noticeable potential as a support for the adsorption of harmful gases.
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2

Kim, Hyung-Ju, Hee-Chul Yang, Dong-Yong Chung, In-Hwan Yang, Yun Jung Choi, and Jei-kwon Moon. "Functionalized Mesoporous Silica Membranes for CO2Separation Applications." Journal of Chemistry 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/202867.

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Mesoporous silica molecular sieves are emerging candidates for a number of potential applications involving adsorption and molecular transport due to their large surface areas, high pore volumes, and tunable pore sizes. Recently, several research groups have investigated the potential of functionalized mesoporous silica molecular sieves as advanced materials in separation devices, such as membranes. In particular, mesoporous silica with a two- or three-dimensional pore structure is one of the most promising types of molecular sieve materials for gas separation membranes. However, several important challenges must first be addressed regarding the successful fabrication of mesoporous silica membranes. First, a novel, high throughput process for the fabrication of continuous and defect-free mesoporous silica membranes is required. Second, functionalization of mesopores on membranes is desirable in order to impart selective properties. Finally, the separation characteristics and performance of functionalized mesoporous silica membranes must be further investigated. Herein, the synthesis, characterization, and applications of mesoporous silica membranes and functionalized mesoporous silica membranes are reviewed with a focus on CO2separation.
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3

Asefa, Tewodros, and Zhimin Tao. "Mesoporous silica and organosilica materials — Review of their synthesis and organic functionalization." Canadian Journal of Chemistry 90, no. 12 (December 2012): 1015–31. http://dx.doi.org/10.1139/v2012-094.

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Mesoporous silica and organosilica materials are a class of nanostructured materials that have porous structures with tunable nanometer pores, large surface areas, high pore volumes, and, in some cases, well-ordered mesostructures. Furthermore, in the case of mesoporous organosilicas, the materials possess various types of organic functional groups. This review highlights the different synthetic methods developed for mesoporous silica and organosilica nanomaterials. The review also discusses the various synthetic strategies used to functionalize the surfaces of mesoporous silica materials and produce highly functionalized mesoporous materials. Rational design and synthetic methods developed to place judiciously chosen one or more than one type of functional group(s) on the surfaces of mesoporous silica materials and generate monofunctional and multifunctional mesoporous silica materials are also introduced. These organic functionalization methods have made possible the synthesis of organically functionalized mesoporous silicas and mesoporous organosilicas with various interesting properties and many potential applications in different areas, ranging from catalysis to drug delivery and biosensing.
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4

Poyraz, Bayram, Hüseyin ÜNAL, and Mustafa Dayı. "Mesopore silica effect on chemical, thermal and tribological properties of polyimide composites." Journal of Polymer Engineering 42, no. 1 (December 8, 2021): 18–26. http://dx.doi.org/10.1515/polyeng-2021-0146.

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Abstract In this experimental study, the effects of mesoporous silica filler content on the chemical, thermal and tribological properties of polyimide composites were investigated. For that purpose, Pi/mesoporous silica composites were produced by in situ polymerization with various mesoporous silicas. After fabrication, thermal stability and chemical characterization were determined using TGA and FTIR. Morphological alterations were monitored with a scanning electron microscope (SEM). Texture structure (pore size and pore volume) were determined by the BJH method. Friction and wear properties were investigated by using a pin-on-disc arrangement. At the end of the study, minor shifts of Pi/mesoporous silica composites were observed. Thermal stability, as well as pore size and pore volume, was decreased with mesoporous silica. The coefficient of friction and specific wear rate decreased with the addition of mesoporous silica. Abrasive wear behaviors were seen for both neat Pi and Pi–Si composites. Hence, this study evidenced that the properties of Pi are influenced by mesoporous dimensions and content of Si employed.
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5

Sakamoto, Yasuhiro. "Aperiodic Crystals at the Mesoscale." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C892. http://dx.doi.org/10.1107/s2053273314091074.

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Materials with mesoscale structural characteristics have attracted great attention across the fields of chemistry, physics, and materials science. A typical example is mesoporous silica, which are synthesized in water/surfactant/silica systems, and has well-defined mesopores resulting in high surface area. Mesoporous silicas have two defining structural characteristics: (i) disorder at the atomic scale, i.e. only short-range order; and (ii) distinct order at the mesoscale, i.e. long-range order. Atomic-scale structural characterization by common diffraction techniques, such as X-ray single crystal diffraction, is challenging for these partially ordered materials. This is because of the difficulty in obtaining large (> 10 µm) single crystals, and because large-distance periodic features cause diffraction intensities to fall off rapidly with scattering angle, so that only limited small-angle data are available. On the other hand, transmission electron microscopy (TEM) is a powerful tool for structural characterization at the mesoscale level due to the stronger interaction of electrons with matter compared to X-rays, enabling the use of very small crystals. In particular, high-resolution TEM (HRTEM) images give the phase and the amplitude of the crystal structure factors experimentally, leading to a 3D structural model by electron crystallography. Cage-type anionic-surfactant-templated mesoporous silicas display rich structural diversity. Among them, cage-type mesoporous silica with tetrahedrally close-packed (TCP) structures can be described by four types of polyhedra, 5^12, 5^12 6^2, 5^12 6^3, and 5^12 6^4.[1] A variety of structural polymorph have been observed and characterized by TEM. Their structures show a close resemblance to the Frank-Kasper phases, which are well known in intermetallic compounds. We found mesoporous silica with dodecagonal quasicrystalline ordering as one of the TCP structures (Figure).[2] In this presentation, I will discuss structural characterization of aperiodic crystals at the mesoscale, such as mesoporous silicas and binary colloidal crystals, by electron microscopy.
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6

Wang, Hairui, Hao Chen, Zhen Xu, Sibing Wang, Baozong Li, and Yi Li. "Control the Morphologies and the Pore Architectures of Mesoporous Silicas through a Dual-Templating Approach." Journal of Nanomaterials 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/371289.

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Mesoporous silica nanospheres were prepared using a chiral cationic low-molecular-weight amphiphile and organic solvents such as toluene, cyclohexane, and tetrachlorocarbon through a dual-templating approach. X-ray diffraction, nitrogen sorption, field emission scanning electron microscopy, and transmission electron microscopy techniques have been used to characterize the mesoporous silicas. The volume ratio of toluene to water plays an important role in controlling the morphologies and the pore architectures of the mesoporous silicas. It was also found that mesoporous silica nanoflakes can be prepared by adding tetrahydrofuran to the reaction mixtures.
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7

Lin, Yu Feng, Chen Chi M. Ma, Yao Yu Lin, Chuan Yu Yen, and Chih Hung Hung. "High Proton-Conducting Sulfonated Poly (Ether Ether Ketone)/ Functionalized Mesoporous Silica Composite Membranes." Key Engineering Materials 334-335 (March 2007): 945–48. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.945.

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A novel organic–inorganic mesoporous silica functionalized with perfluoroalkylsulfonic acid groups analogous to that of Nafion® has been prepared. A condensation reaction between surface silanol groups of the mesoporous silicas and 1,2,2-trifluoro-2-hydroxy-1-trifluoromethylethane sulfonic acid Beta-sultone was conducted. High proton conducting sulfonated poly(ether ether ketone) (sPEEK)/ functionalized mesoporous silica composite membranes were prepared through homogeneous dispersive mixing and solvent casting method. In the study, proton conductivity (σ) of composite membrane is increased from 0.01 to 0.038 (S/cm) as the modified mesoporous silica content is increased from 0 to 5 wt. %. It is found that the ion exchange capacity (IEC) is increased from 1.54 to 1.70 (meq/g) as the modified mesoporous silica content is increased from 0 to 5 wt. %. From morphology investigation, it is found that incorporation of modified mesoporous silica by rotary vacuum evaporation enables the preparation of homogeneous membranes. The membranes present a good adhesion between inorganic domains which could be used for fuel cell applications.
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8

Yeh, Yi Qi, Chun Wan Yen, Hong-Ping Lin, Yu Cheng Lin, and Tsung Chain Chang. "Synthesis of Au Nanoparticles@Mesoporous Silica Templated by Neutral Block Copolymers: Application in CO Oxidation." Materials Science Forum 505-507 (January 2006): 655–60. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.655.

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A citrate-stabilizing Au nanoparticles aqueous solution was prepared at near 0 oC by reducing tetracholoaurate(III) ions with sodium borohydride. Combining with Pluronic block copolymers, the citrate-stabilizing Au nanoparticles was nearly completely embedded in the mesoporous silica channels via fast silicification with silicate solution at near neutral pH. After calcination for removing organic templates, Au nanoparticles@mesoporous silicas of high surface area and pore volume were obtained. With different block copolymer, the pore size of the mesoporous silica can be tuned. The Au nanoparticles@SBA-15 mesoporous silica exhibits high catalytic activity to CO oxidation reaction.
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9

Gudiño-Rivera, Javier, Francisco J. Medellín-Rodríguez, Carlos Ávila-Orta, Alma G. Palestino-Escobedo, and Saúl Sánchez-Valdés. "Structure/Property Relationships of Poly(L-lactic Acid)/Mesoporous Silica Nanocomposites." Journal of Polymers 2013 (December 24, 2013): 1–10. http://dx.doi.org/10.1155/2013/162603.

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Biodegradable poly(L-lactic acid) (PLLA)/mesoporous silica nanocomposites were prepared by grafting L-lactic acid oligomer onto silanol groups at the surface of mesoporous silica (SBA-15). The infrared results showed that the lactic acid oligomer was grafted onto the mesoporous silica. Surface characterization of mesoporous silica proved that the grafted oligomer blocked the entry of nitrogen into the mesopores. Thermal analysis measurements showed evidence that, once mixed with PLLA, SBA-15 not only nucleated the PLLA but also increased the total amount of crystallinity. Neat PLLA and its nanocomposites crystallized in the same crystal habit and, as expected, PLLA had a defined periodicity compared with the nanocomposites. This was because the grafted macromolecules on silica tended to cover the lamellar crystalline order. The g-SBA-15 nanoparticles improved the tensile moduli, increasing also the tensile strength of the resultant nanocomposites. Overall, the silica concentration tended to form a brittle material.
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10

Wang, Hongjuan, Xuefei Liu, Olena Saliy, Wei Hu, and Jingui Wang. "Robust Amino-Functionalized Mesoporous Silica Hollow Spheres Templated by CO2 Bubbles." Molecules 27, no. 1 (December 22, 2021): 53. http://dx.doi.org/10.3390/molecules27010053.

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Hollow-structured mesoporous silica has wide applications in catalysis and drug delivery due to its high surface area, large hollow space, and short diffusion mesochannels. However, the synthesis of hollow structures usually requires sacrificial templates, leading to increased production costs and environmental problems. Here, for the first time, amino-functionalized mesoporous silica hollow spheres were synthesized by using CO2 gaseous bubbles as templates. The assembly of anionic surfactants, co-structure directing agents, and inorganic silica precursors around CO2 bubbles formed the mesoporous silica shells. The hollow silica spheres, 200–400 nm in size with 20–30 nm spherical shell thickness, had abundant amine groups on the surface of the mesopores, indicating excellent applications for CO2 capture, Knoevenagel condensation reaction, and the controlled release of Drugs.
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11

Deschanels, X., S. Dourdain, C. Rey, G. Toquer, A. Grandjean, S. Pellet-Rostaing, O. Dugne, C. Grygiel, F. Duval, and Y. Serruys. "Radiation damages on mesoporous silica thin films and bulk materials." MRS Proceedings 1514 (2013): 69–74. http://dx.doi.org/10.1557/opl.2013.386.

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ABSTRACTMesoporous silicas are highly potential materials for applications in the nuclear field like separation, recycling or nuclear wastes confinement. In this work, the effects of the radiation damage on the mesoporous network were investigated by XRR (X-Rays Reflectivity) and nitrogen adsorption isotherm on respectively mesoporous organized thin films (SBA) and disordered bulk mesoporous materials (Vycor glass). The article attempts to answer the question of the existence of a relationship between the rigidity of the mesoporous silica network, and the behavior of silica materials under irradiation.
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12

Li, Qiuping, and You Zhou. "Brief History, Preparation Method, and Biological Application of Mesoporous Silica Molecular Sieves: A Narrative Review." Molecules 28, no. 5 (February 21, 2023): 2013. http://dx.doi.org/10.3390/molecules28052013.

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It has been more than 30 years since the first ordered mesoporous silica molecular sieve (MCM-41) was reported, but the enthusiasm for exploiting mesoporous silica is still growing due to its superior properties, such as its controllable morphology, excellent hosting capability, easy functionalization, and good biocompatibility. In this narrative review, the brief history of the discovery of mesoporous silica and several important mesoporous silica families are summarized. The development of mesoporous silica microspheres with nanoscale dimensions, hollow mesoporous silica microspheres, and dendritic mesoporous silica nanospheres is also described. Meanwhile, common synthesis methods for traditional mesoporous silica, mesoporous silica microspheres, and hollow mesoporous silica microspheres are discussed. Then, we introduce the biological applications of mesoporous silica in fields such as drug delivery, bioimaging, and biosensing. We hope this review will help people to understand the history of the development of mesoporous silica molecular sieves and become familiar with their synthesis methods and applications in biology.
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13

Salimian, S., A. Zadhoush, and A. Mohammadi. "A review on new mesostructured composite materials: Part I. synthesis of polymer-mesoporous silica nanocomposite." Journal of Reinforced Plastics and Composites 37, no. 7 (January 10, 2018): 441–59. http://dx.doi.org/10.1177/0731684417752081.

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Mesoporous silicas are inorganic materials with large surface areas, uniform framework structures and readily controlled pore diameters which are synthesized in the presence of surfactants as structure-directing agents, followed by the removal of the surfactant by extraction or calcination. Due to their characteristics, such as ordered structure, high surface area, and favorable interfacial interactions between silica surface and the polymer, they have found excellent potential application for use as reinforcing agents for several engineering polymer systems. While a large number of different synthesis approaches for the preparation of mesoporous silica-polymer nanocomposites has been reported in literature, there is nevertheless a growing need for verified synthesis methods of mesoporous silica-polymer materials. This paper presents a review of the literature on the methods for synthesizing polymer-mesoporous silica nanocomposites and discusses some unique properties of these composites.
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14

Kooyman, Patricia J., Markéta Slabová, Vladimír Bosáček, Jiří Čejka, Jiří Rathouský, and Arnošt Zukal. "The Influence of pH on the Structure of Templated Mesoporous Silicas Prepared from Sodium Metasilicate." Collection of Czechoslovak Chemical Communications 66, no. 4 (2001): 555–66. http://dx.doi.org/10.1135/cccc20010555.

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A recently developed homogeneous precipitation method was used for the investigation of the influence of pH on the structure of mesoporous silicas prepared from sodium metasilicate in the presence of a quaternary alkyl ammonium surfactant as a structure directing agent. The rate of pH decrease affects the assembly of mesoscopically ordered composites and, consequently, the porous structure of mesoporous silicas prepared from them by calcination. Pure MCM-41 molecular sieve was prepared by controlling the pH decrease of the reaction mixture so as to achieve the final pH 7.8. The as-made material prepared at higher pH (final value 10.1) is characterized by a lower degree of silica polycondensation. Due to the shrinkage of this material during calcination, a less well-ordered silica with extraordinary large surface area was prepared. A large decrease in pH (final value 5.2) led to non-organized polycondensation of silica species besides the organized assembly of the ordered material, which resulted in the formation of silica with a bimodal mesoporous structure.
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15

BOUHALI, Hasna, Nabila CHALAL, Hadj HAMAIZI, and Abdelkader BENGUEDDACH. "Synthesis and CO2 sorption of silica particles, kinetics and thermodynamics." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 5 (June 3, 2014): 2711–19. http://dx.doi.org/10.24297/jac.v10i5.888.

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Spherical ordered mesoporous silica particles with radially oriented mesopores were successfully prepared by using non-ionic amphiphilic di-block co-polymers CnH2n+1-(EO)x-OH as template and tetraorthosilicate (TEOS) as silica precursor. The synthesized mesoporous silica materials were characterized by XRD, N2 adsorption-desorption and SEM techniques. CO2 adsorption at 0 °C was evaluated by a volumetric method, and the CO2 sorption behavior was described by applying both Langmuir and Freundlich equations. Results indicate a high adsorption capacity of CO2 (5-9 mmol/g), depending essentially on the porous texture of the materials. An adsorption kinetic model was proposed to describe the adsorption of CO2 over template-free mesoporous siliceous materials. A good agreement with experimental data was found.
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16

He, Qianjun, Chaohe Xu, Jianqiang Luo, Wei Wu, and Jianlin Shi. "A novel mesoporous carbon@silicon–silica nanostructure for high-performance Li-ion battery anodes." Chem. Commun. 50, no. 90 (2014): 13944–47. http://dx.doi.org/10.1039/c4cc03545c.

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A novel hierarchical nanostructure with graphite-like carbon and small Si nanocrystals, respectively, encapsulated in the mesopores and embedded in a silica framework of mesoporous silica nanoparticles is constructed for high-performance Li-ion batteries.
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17

UENO, Yuko. "Mesoporous Silica." Analytical Sciences 35, no. 2 (February 10, 2019): 121–22. http://dx.doi.org/10.2116/analsci.highlights1902.

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18

Yokogawa, Yoshiyuki, Sindhu Seelan, and Yin Zhang. "Hyperstructured Hydroxyapatite Ceramics as a Carrier for Cell and Protein." Key Engineering Materials 309-311 (May 2006): 939–42. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.939.

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The preparation of hyperstructured hydroxyapatite (HAp) ceramics is reported. Mesoporous silica with nano size pore was coated on the bi-modal type porous HAp ceramics with pore size 100-200 µm and 1-2 µm. The mesoporous silica coating was done using two different procedures and the ceramics were characterized by XRD, N2 Sorption, SEM/EDX, and TEM. The results clearly showed the formation of mesoporous coating on the large pores of parent HAp ceramics. SEM images reveal that the mesoporous coatings consists of almost spherical particles with relatively uniform sizes of ~1 µm. Protein adsorption and release behavior on these mesoporous coated HAp ceramics was evaluated using UV-VIS spectrometry. The large pores are suitable for cell immobilization, and the mesopores several nm in size were found to enhance protein encapsulation ability.
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19

MISRAN, HALINA, RAMESH SINGH, and MARIYAM JAMEELAH GHAZALI. "PALM OIL BASED FATTY ALCOHOLS TEMPLATED MESOPOROUS SILICA AND SILICA SPHERES." International Journal of Nanoscience 10, no. 06 (December 2011): 1275–81. http://dx.doi.org/10.1142/s0219581x1100960x.

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Mesoporous silica xerogels with wormhole-like pore structure were successfully synthesized using a series of surfactantless oil-in-water emulsion at room temperature. The surfactantless emulsion systems consisted of palm-oil derived fatty alcohols having several carbon chain lengths to act as mesoporous templates in place of commercial surfactants in a direct base–acid catalyzed sol–gel method. This method allowed direct decomposition of fatty alcohols in situ during calcination process to create mesoporosity in the materials. The mesoporous silica xerogels exhibited relatively high surface area at ca. 505 m2/g and pore sizes at ca. 8 nm to 13 nm as the carbon chain lengths were varied. The pore size obtained in this study was larger than the conventional MCM-41 materials (at ca. 2 nm). The mesopores were generated from the interstices of the primary particles (framework-confined porosity) and secondary particles (textural porosity). Furthermore, by changing the co-solvent amount and oil/water ratio, surfactantless oil-in-water microemulsions were obtained. These microemulsions were useful in the synthesis of monodispersed silica spheres. The size of the silica spheres could be controlled at two different size clusters, ca. 50–200 nm and at ca. 500 nm.
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20

Mgaya, James. "Trypsin Immobilization on Thiol Functionalized Mesoporous Silicas Prepared Using Castor Oil Template." Tanzania Journal of Science 46, no. 3 (October 30, 2020): 755–67. http://dx.doi.org/10.4314/tjs.v46i3.16.

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Mesoporous thiol modified silicas have been prepared using castor oil as a templating agent. The preparation was done through a co-condensation of 3-mercaptopropyltriethoxysilane and tetraethylorthosilicate in a 1:4 molar ratio. Physisorption studies showed that the prepared mesoporous silicas have an average pore diameter of 9 nm, pore volume of 1.0336 cm3/g and surface areas of up to 605 m2/g. FTIR confirmed the attachment of thiol groups on the surface of the prepared mesoporous silica as evidenced with an absorption band at around 2600 cm. SEM images indicated agglomeration of the prepared particles. The prepared thiol modified silicas were successfully immobilized with trypsin enzyme. The immobilized trypsin enzyme was stable and active for hydrolysis of N-α-benzoyl-DL-arginine-p-nitroanilide (BAPNA) substrate. Re-use studies of the immobilized trypsin showed that the enzyme could be reused up to four cycles without significant loss of activity. Keywords: Castor oil; Template; Mesoporous silica; Thiol; Trypsin; Enzyme immobilization;
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21

Liu, Zhijun, Jiaxi Ru, Shiqi Sun, Zhidong Teng, Hu Dong, Pin Song, Yunshang Yang, and Huichen Guo. "Uniform dendrimer-like mesoporous silica nanoparticles as a nano-adjuvant for foot-and-mouth disease virus-like particle vaccine." Journal of Materials Chemistry B 7, no. 21 (2019): 3446–54. http://dx.doi.org/10.1039/c8tb03315c.

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22

SHON, JEONG KUK, SOO SUNG KONG, SUNG SOO KIM, MIN SUK KANG, JI MAN KIM, and BYUNG GUK SO. "SYNTHESIS OF MESOPOROUS IRON OXIDE NANOPARTICLES FROM MESOPOROUS SILICA TEMPLATE VIA NANO-REPLICATION." Functional Materials Letters 01, no. 02 (September 2008): 151–54. http://dx.doi.org/10.1142/s1793604708000277.

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Highly ordered mesoporous iron oxide (α- Fe 2 O 3) material has been successfully obtained from mesoporous silica template, KIT-6 (3-D Cubic Ia3d symmetry), through nano-replication method. The mesoporous α- Fe 2 O 3 material thus obtained exhibits well-defined mesopores (2.7 nm in diameter), high surface area (148 m2/g), high pore volume (0.47 cm3/g) and crystalline frameworks. The morphology of the mesoporous α- Fe 2 O 3 material is very uniform in spherical shape of which the average particle size is about 100 nm in diameter.
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23

Cheah, Wee Keat, Wei Lee Thung, Radzali Othman, and Fei Yee Yeoh. "Preparation and Characterization of Amine-Functionalised SBA-15." Advanced Materials Research 686 (April 2013): 336–50. http://dx.doi.org/10.4028/www.scientific.net/amr.686.336.

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Ever since the first report of ordered mesoporous silica by the Mobil group, various preparation techniques for mesoporous were extensively studied. In addition to the desirable large surface area, surface of mesoporous silica could be modified for specific catalytic and sensor applications. In this present study, SBA-15 mesoporous silica was prepared and further surface modification was done using organoalkoxysilane (aminopropyl and ethylendiaminopropyl). The resulting bare mesoporous silica, anime-functionalised and diamine-functionalised mesoporous silica were characterized using FTIR, XRD, SEM and EDS for the analysis of incorporation of amine functional groups, phase analysis, powder morphology and elemental analysis.
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24

Cao, Yingze, Wentao Zhai, Xiang Zhang, Shuxi Li, Lin Feng, and Yen Wei. "Mesoporous SiO2-Supported Pt Nanoparticles for Catalytic Application." ISRN Nanomaterials 2013 (March 10, 2013): 1–7. http://dx.doi.org/10.1155/2013/745397.

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SiO2 nanoparticles have been synthesized by combining Stober’s method and nonsurfactant process. The diameters and pore sizes can be controlled by altering the template and its concentration. Mesoporous SiO2 obtained this way has extremely large surface area compared with most oxide supports, which benefits the catalytic performance. Pt nanoparticles were in situ grown on and in mesoporous SiO2 nanoparticles with low amount of the metal and high load ratio. Furthermore, we firstly developed a novel route, called “one-pot” method, to prepare Pt/SiO2 catalyst where mesoporous silica preparing and Pt loading occurred in one step. This method is more efficient in saving reagent, since it can prevent Pt loss. In the meantime, it enables the template to reduce agent. The catalytic activity of Pt/SiO2 samples was measured by CO oxidation. It is indicated that the supporting silica with mesopores is more active than silica with micropores.
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25

Zhang, Qian, Minying Wu, Yuanyuan Fang, Chao Deng, Hsin-Hui Shen, Yi Tang, and Yajun Wang. "Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application." Nanomaterials 12, no. 11 (June 6, 2022): 1940. http://dx.doi.org/10.3390/nano12111940.

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Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the cell for guest molecules. Here, we propose a novel strategy for the preparation of HMSN with large dendritic mesopores to achieve higher enzyme loading capacity and more efficient bioreactors. The materials were prepared by combining barium sulfate nanoparticles (BaSO4 NP) as a hard template and the in situ-formed 3-aminophenol/formaldehyde resin as a porogen for directing the dendritic mesopores’ formation. HMSNs with different particle sizes, shell thicknesses, and pore structures have been prepared by choosing BaSO4 NP of various sizes and adjusting the amount of tetraethyl orthosilicate added in synthesis. The obtained HMSN-1.1 possesses a high pore volume (1.07 cm3 g−1), a large average pore size (10.9 nm), and dendritic mesopores that penetrated through the shell. The advantages of HMSNs are also demonstrated for enzyme (catalase) immobilization and subsequent use of catalase-loaded HMSNs as bioreactors for catalyzing the H2O2 degradation reaction. The hollow and dendritic mesoporous shell features of HMSNs provide abundant tunnels for molecular transport and more accessible surfaces for molecular adsorption, showing great promise in developing efficient nanoreactors and drug delivery vehicles.
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26

Guzmán-Cruz, Andrés, F. Paraguay-Delgado, and Mou Pal. "An Environmentally Friendly Approach for the Synthesis of Au Nanoparticles Supported Mesoporous Silica for Catalytic Applications." MOLECULAR SCIENCES AND APPLICATIONS 2 (June 2, 2022): 76–82. http://dx.doi.org/10.37394/232023.2022.2.9.

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Mesoporous silica has received much attention as an attractive support material for metal nanoparticles (NPs) with good dispersion and exceptional stability for various catalytic reactions. However, the lack of synthetic protocols to controlled synthesis of mesoporous silica with high surface area and ideal pore size for supporting metal NPs significantly reduces the catalytic performance and stability of the catalysts. This work reports a facile synthetic route to prepare mesoporous silica-supported Au NPs (Au/SiO2) for efficient catalytic reduction of 4-nitrophenol. An environmentally friendly synthetic route was exploited to prepare mesoporous silica using deep eutectic solvent (DES) derived from choline chloride/urea as an efficient solvent and template in solvothermal reaction. The mesoporous silica was first functionalized with –NH2 groups, and subsequently, Au NPs with an average size of 10 nm were deposited onto the mesoporous silica matrix. Owing to the strong interaction of supported Au NPs with the mesoporous silica support, the resultant composite exhibited excellent catalytic performance towards the reduction of 4-NP to 4-aminophenol with a rate constant of Kapp= 3.04 x10-1 min-1 and exceptionally high stability compared to bare mesoporous silica catalyst. The current green approach to fabricating mesoporous silica and Au/SiO2 catalysts holds great promise since it is a much cheaper and environmentally friendly method for large-scale fabrication of other supported catalysts for different catalytic reactions.
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Jan, Lal Said, Radiman Shahidan, and Iskandar Idris Yaacob. "Nano-Porous Silica (SiO2) and Iron-Silica (Fe2O3-SiO2 ) Composite Synthesis via Reverse Microemulsion for Catalytic Applications." Key Engineering Materials 306-308 (March 2006): 1127–32. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1127.

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Nanostructured silica and silica-iron composite particles were prepared using water-in-oil (w/o) reverse microemulsion. Double microemulsion technique is used for the synthesis of both types of nanostructured particles. X-ray Diffractometry (XRD), scanning electron microscopy (SEM), nitrogen gas adsorption-desorption isotherm technique, and differential scanning calorimetry (DSC) were used to characterize the synthesized particles. The gas adsorptiondesorption measurements revealed a mesoporous structure for the silica (SiO2) particles with a surface area of 300.49 m2/g. Upon the addition of an iron microemulsion to the silica microemulsion, silica-iron nanocomposite (Fe2O3-SiO2) was achieved which gave a surface area of 69.87 m2/g. This indicated a positive impregnation of the silica mesopores that was further confirmed by energy dispersive spectrometry (EDS). The XRD of bare SiO2 gave a single broad peak whereas SiO2-Fe2O3 demonstrated additional peaks confirming α-iron insertion in mesoporous silica. DSC curve with its characteristic peaks also indicated the presence of iron nanoparticles within silica. The product silica-iron nanocomposite has potential catalytic and semiconducting applications.
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Viscardi, Rosanna, Vincenzo Barbarossa, Raimondo Maggi, and Francesco Pancrazzi. "Engineering Modified Mesoporous Silica Catalysts through Porosity and Surface Acidity Control for Selective Production of DME." Key Engineering Materials 894 (July 27, 2021): 45–49. http://dx.doi.org/10.4028/www.scientific.net/kem.894.45.

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DME has been received the attention as a renewable energy due to its thermal efficiencies equivalent to diesel fuel, lower NOx emission, near-zero smoke and non-toxic. DME can be obtained by methanol dehydration over solid acid catalysts or directly from syngas over bifunctional catalysts. The catalytic dehydration of methanol to DME has been widely studied in the literature over pure or modified γ -aluminas (γ-Al2O3) and zeolites. Mesoporous silica has obtained much consideration due to its well-defined structural order, high surface area, and tunable pore diameter. In this work, sulfonic acid and aluminium modified mesoporous silica were synthesized and tested as catalysts for production of dimethyl ether from methanol. The modified silicas were studied utilizing XRD, N2 physisorption, pyridine adsorption, and scanning electronic microscopy. The effects of reaction temperature and water deactivation on the methanol selectivity and conversion to dimethyl ether were investigated. Sulfonic acid modified mesoporous silica showed higher selectivity and stability of DME than that of aluminosilicate. The grafting of mesoporous silica with sulfonic groups displayed much more enhanced hydrothermal stability than Al-MCM-41 and γ-Al2O3.
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He, Jia Li, Xiu Hua Chen, Wen Jie Zhu, Wen Hui Ma, Yong Yin Xiao, Jiao Li, and Hui Zhang. "Synthesis of Mesoporous Silica Microspheres by PICA and Pseudomorphic Transformation Using Silica Fume as Silica Source." Materials Science Forum 809-810 (December 2014): 207–12. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.207.

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Monodisperse mesoporous silica microspheres (MSM-SF) were successfully prepared through PICA and pseudomorphic transformation using silica fume as original silica source. The structure and morphology of spheres were quantitatively investigated by Zata potential and particle size analyzer, N2 sorption isotherms, XRD, SEM and TEM. The results showed that the monodisperse spherical mesoporous silica microspheres (MSM-SF) exhibited uniform spherical morphology, worm-like mesoporous, large BET surface area of 559.9m2/g; its BJH average pore size diameter and total pore volume are 3.3nm and 0.12cm3/g, respectively. This preparation method provides a new synthetic strategy to control the particle morphology and structure simultaneously, meanwhile this method can also significantly reduce the cost of synthesis of mesoporous silica microspheres.
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Meilita, Pera, Syamsi Aini, Fajriah Azra, and Rahadian Zainul. "Effect of Hexane Addition on Mesoporous Silica Crystal Size Using Na2SiO3 from Chert Stone." Jurnal Periodic Jurusan Kimia UNP 11, no. 2 (August 1, 2022): 36. http://dx.doi.org/10.24036/p.v11i2.113747.

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Mesoporous silica is a silica solid with pores between 2-50 nm which can be used in the fields of adsorption, medicine, catalyst synthesis, material purification and stationary phase for chromatography. Mesoporous silica is generally synthesized using TEOS or TMOS, but these precursors are relatively expensive. Na2SiO3 is a precursor of mesoporous silica which is more economical and easy to obtain. Basic materials that contain a lot of silica such as chert can be synthesized into Na2SiO3. Mesoporous silica synthesis generally uses surfactants as templates for the polymerization of silica, therefore a cosolvent is needed that can act as a crystal size enlarger by interacting with surfactants. The purpose of this study was to determine the effect of the addition of hexane on the synthesis of mesoporous silica symbolized by SM and SMH5. Mesoporous silica was synthesized using the sol-gel method with the basic ingredients of Na2SiO3 from chert, P104 as a surfactant, HCl as a solvent and n-hexane as an additive to increase crystal size. Mesoporous silica was characterized using XRD. The results of measurements using XRD showed that the X-ray difragtogram pattern showed peaks at an angle of 2ϴ = 22.29o and 25.33o for SM and SMH5 products, respectively.
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Hernando Abad, Eduardo Hernando, Frédéric Bouyer, Laroussi Chaabane, Alan Zerrouki, Jérémie Margueritat, and Lucien Saviot. "Sub-THz Vibrational Dynamics in Ordered Mesoporous Silica Nanoparticles." Nanomaterials 13, no. 14 (July 15, 2023): 2078. http://dx.doi.org/10.3390/nano13142078.

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The vibrational dynamics in the sub-THz range of mesoporous silica nanoparticles (MSNs) having ordered cylindrical mesopores was investigated. MCM-41 and SBA-15 particles were synthesized, and their structure was determined using scanning electron microscopy (SEM), low-angle X-ray diffraction (XRD), N2 physisorption analyses, and Raman scattering. Brillouin scattering measurements are reported and enabled determining the stiffness of the silica walls (speed of sound) using finite element calculations for the ordered mesoporous structure. The relevance of this approach is discussed based on the comparison between the numerical and experimental results and previous works reported in the literature.
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Kim, Y., B. G. Song, Soo Ryong Kim, and Kwang Jin Kim. "Drug Loaded Porous Hydroxyapatite and Its In Vitro Release." Key Engineering Materials 284-286 (April 2005): 423–26. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.423.

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Porous hydroxyapatite coated with mesoporous silica has been utilized as the matrix for controlled drug delivery. TEM observation confirms the pore size of mesoporous silica scatters about 50 Å. Porous hydroxyapatite was coated with mesoporous silica via sol-gel process. Ibuprofen and was loaded into the pores of mesoporous silica, and controlled release profiles were studied by soaking the samples in a simulated body fluid using a UV-VIS spectrophotometer.
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Aulia, Pidia, Saprini Hamdiani, and Iwan Sumarlan. "Synthesis of Rice Husk Mesoporous Silica as pH Responsive Release Material." Acta Chimica Asiana 2, no. 2 (August 15, 2019): 103. http://dx.doi.org/10.29303/aca.v2i2.21.

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The synthesis of mesoporous silica as a delivery agent for the ethyl para-methoxycinnamate has been carried out. The study aims to determine the process of mesoporous silica synthesis from sodium silicate from the smelting of rice husk ash, determine the adsorption capacity of mesoporous silica in the ethyl para-methoxycinnamate and the pH responsive release of ethyl para-methoxycinnamate with mesoporous silica as a delivery agent in simulated intestinal and gastric fluids. It was found that mesoporous silica can be synthesized from rice husk ash with a 30% tartaric acid template. Characterization of mesoporous silica using FTIR spectroscopy showed the presence of silanol (Si-OH) and siloxane (Si-O-Si) functional groups. Mesoporous silica from rice husk ash is able as adsorbent for the ethyl para-methoxycinnamate with the adsorption capacity of 8.26 mg/g. The release test of gastric simulation fluid (pH 1.2) showed that the ethyl-para-methoxycinnamate was released from silica for a period of 12 hours. In the intestinal simulation fluid (pH 7.4), the release of the ethyl para-methoxycinnamate occurred slowly at the first hour, then gradually increased at 5 hour up to 12 hour.
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Ahmad, Sana, Javariah Javaid, and Wajeeha Fatima. "Controlled Release of Ibuprofen by Using Morphologically Modified Mesoporous Silica." Advances in Materials Science and Engineering 2022 (May 18, 2022): 1–7. http://dx.doi.org/10.1155/2022/6376915.

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The synthesis of mesoporous silica with variable pore sizes was carried out for the purpose of controlled drug release study. Mesoporous silica containing three-dimensional cagelike structures was prepared by the simple hydrothermal method using triblock copolymer Pluronic F-127 as the template and tetraethyl orthosilicate (TEOS) as a silica source. The synthesized samples of plain and modified mesoporous silica were compared to measure the drug release ability of ibuprofen. The effect of cosurfactants, temperature, and different salts on the pore structure of the materials were also observed. The surface property enhancement of mesoporous silica was contributed by controlling its pore morphology. The materials were characterized by FT-IR, SEM, TGA, and UV-Visible spectroscopy and later used for the ibuprofen release study. The results indicated that the modified mesoporous silica with increased pore diameter showed increased storage capacity and high pH-responsive release behavior as compared to the plain mesoporous silica.
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Padiyar, Neha, Nidhi Nainwal, Yogita Ale, and Deepika Galwan. "Formulation, Characterization and Stability Aspects of Mesoporous Silica Nanoparticles." INTERNATIONAL JOURNAL OF DRUG DELIVERY TECHNOLOGY 14, no. 02 (June 24, 2024): 1217–24. http://dx.doi.org/10.25258/ijddt.14.2.88.

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Mesoporous silica nanoparticles are a type of inorganic nanoparticles having mesopores of 2 to 50 nm in size. The nanosized mesoporous particles of silica facilitate endocytosis in drug targeting without any side effects. Mesoporous silica nanoparticle (MSN) can be used to deliver a variety of therapeutic agents or gene delivery through active or chemical adsorption. MSNs can be used in the field of biomedical for the detection and treatment of various diseases like cancers, infection, inflammation, diabetes, bone-related disorders, cardiac diseases, neurodegenerative diseases, etc. The unique characteristics of MSNs in the form of easily adjustable pore size, surface area, particle size, pore volume, and surface morphology are advantageous not only in the biomedical field but also in the fields of biosensors, imaging, agriculture, thermal energy, and catalysis, etc. MSNs provide high surface area, easy surface functionalization, and controlled drug release. MSNs are formulated after condensation of silica in the presence of molecular templates like surfactants and polymers. This review article focused on giving in-depth knowledge about formulation techniques. Various types of excipients, such as catalysts, silica, solvents and surfactants utilized for the formulation of silica-based nanoparticles, have been summarized. The characterization of MSNs using suitable techniques was also reviewed. The stability of MSNs and factors affecting their stability is a crucial part of formulation development that is discussed here
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Yuan, Shuai, Shusuke Oakada, Keiichi Maki, Yasutaka Kuwahara, Masanori Tomonari, Shinichi Kawasaki, Kohsuke Mori, and Hiromi Yamashita. "Synthesis and Photocatalytic Activity of TiO2 Nanoparticles Loaded on the Fluorine-Modified Hydrophobic Mesoporous Silica." Solid State Phenomena 124-126 (June 2007): 1817–20. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1817.

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The fluorine-modified mesoporous silica HMS(F20) was synthesized by using the mixture of TEFS(SiF(OC2H5)3) and TEOS(Si(OC2H5)4) as the silica source. The specific surface and pore size distribution were characterized by N2 adsorption and the hydrophilic-hydrophobic property was measured by water adsorption. The photocatalytic activities of TiO2 nanoparticles loaded on HMF(F20) and HMS were investigated for the degradation of iso-butanol diluted in water. The results show that the fluorine-modified mesoporous silica HMS(F20) has higher hydrophobic property than HMS and the TiO2/HMS(F20) exhibits the higher photocatalytic activity than TiO2/HMS. The hydrophobic mesopores benefit the condensation of hydrophobic organic compounds diluted in water, which results in higher photocatalytic degradation efficiency.
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37

Xu, De Lan, Chang Wang Shao, Feng Jiao Chen, and Guo Wei Zhou. "Synthesis of the Mesoporous Silica with Different Morphological Structure by Modifying the Solution Conditions." Advanced Materials Research 634-638 (January 2013): 2280–83. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2280.

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Mesoporous silica with different morphological structure had been prepared using cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium dodecyl sulfate (SDS) as co-surfactant templates and tetraethoxysilane (TEOS) as silica source. Variation on the morphological structure can be achieved by adjusting the solution conditions. The mesoporous silica with varied morphologies and pore structures were characterized by transmission electron microscopy (TEM), small-angle X-ray diffraction (SAXRD) and N2 adsorption-desorption isotherms. Based on experimental results, the mesoporous silica morphologies including vesicle-like and hollow nanospheres with mesoporous shell has been proposed. It was also observed a transformation from vesicle-like silica to hollow nanospheres with mesoporous shell by regulating the solution conditions.
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38

Srinivasan, U., I. Homma, C. M. Chun, D. M. Dabbs, D. A. Hajduk, S. M. Gruner, and I. A. Aksay. "Nanocomposite processing via infiltration of mesoporous silica." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 212–13. http://dx.doi.org/10.1017/s0424820100137434.

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Synthesis of materials with nanoscale (1~100 nm) organization is important in various applications. Recently, scientists at Mobil described a new family of mesoporous molecular sieves. These materials have regular arrays of uniform pore channels ranging from 1.6~10 nm in diameter in contrast to other mesoporous solids such as amorphous silicas and modified layered clays and silicates. A surfactantsilicate co-assembly model has been proposed to explain the formation of these materials. According to this pathway, the matching of the charge density at the organic-inorganic interface controls the assembly of the mesophases and four distinct silica mesophases have been observed, lamellae, hexagonally packed tubes, and two bicontinuous structures of cubic symmetry. Different phases are constructed by varying the synthesis parameters such as the surfactant/silicate ratio and the acidity. Here, we report the synthesis of a new amorphous mesoporous phase with short range order and with no long range crystallinity. Due to its interpenetrating network structure, this amorphous mesoporous silica can be used as a matrix for nanocomposite processing. Here, we use it as a host to process ruby glass.
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39

da Silva de Barros, Aline Oliveira, Luciana Magalhães Rebêlo Alencar, Frank Alexis, and Ralph Santos-Oliveira. "Distinct Methodologies to Produce Capped Mesoporous Silica with Hydroxyapatite and the Influence in Intracellular Signaling as Cytotoxicity on Human Umbilical Vein Endothelial Cells." Bioengineering 8, no. 9 (September 12, 2021): 125. http://dx.doi.org/10.3390/bioengineering8090125.

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Mesoporous silica has unique properties such as controllable mesoporous structure and size, good biocompatibility, high specific surface area, and large pore volume. For that reason, this material has been broadly functionalized for biomedical applications, such as optical imaging, magnetic resonance imaging (MRI), positron emission tomography (PET), computed tomography (CT), ultrasound imaging, and widely employed as drug delivery systems. In this study, we synthesized fiber-type mesoporous silica capped with hydroxyapatite (ordered SiO2–CaO–P2O5 mesoporous silica). Its biological activity was evaluated through a cellular and molecular approach using HUVEC cell culture. Two distinct methodologies have produced the ordered SiO2–CaO–P2O5 mesoporous silica: (i) two-step Ca-doped silica matrix followed by hydroxyapatite crystallization inside the Ca-doped silica matrix and (ii) one-step Ca-doped silica matrix formed with the hydroxyapatite crystallization. Further analysis included: elemental analysis, transmission, scanning electron microscopy images, Small and Wide-Angle X-ray Diffraction analysis, Fourier Transform Infrared, and in vitro assays with HUVEC (cytotoxicity and immunoblotting). The hydroxyapatite capping methodology significantly affected the original mesoporous material structure. Furthermore, no cellular or molecular effect has been observed. The promising results presented here suggest that the one-step method to obtain hydroxyapatite capped mesoporous silica was effective, also demonstrating that this material has potential in biomedical applications.
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40

Giraldo, L. F., B. L. López, L. Pérez, S. Urrego, L. Sierra, and M. Mesa. "Mesoporous Silica Applications." Macromolecular Symposia 258, no. 1 (November 2007): 129–41. http://dx.doi.org/10.1002/masy.200751215.

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41

Han, Yandong, Lin Zhang, and Wensheng Yang. "Synthesis of Mesoporous Silica Using the Sol–Gel Approach: Adjusting Architecture and Composition for Novel Applications." Nanomaterials 14, no. 11 (May 21, 2024): 903. http://dx.doi.org/10.3390/nano14110903.

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The sol–gel chemistry of silica has long been used for manipulating the size, shape, and microstructure of mesoporous silica particles. This manipulation is performed in mild conditions through controlling the hydrolysis and condensation of silicon alkoxide. Compared to amorphous silica particles, the preparation of mesoporous silica, such as MCM-41, using the sol–gel approach offers several unique advantages in the fields of catalysis, medicament, and environment, due to its ordered mesoporous structure, high specific surface area, large pore volume, and easily functionalized surface. In this review, our primary focus is on the latest research related to the manipulation of mesoporous silica architectures using the sol–gel approach. We summarize various structures, including hollow, yolk-shell, multi-shelled hollow, Janus, nanotubular, and 2D membrane structures. Additionally, we survey sol–gel strategies involving the introduction of various functional elements onto the surface of mesoporous silica to enhance its performance. Furthermore, we outline the prospects and challenges associated with mesoporous silica featuring different structures and functions in promising applications, such as high-performance catalysis, biomedicine, wastewater treatment, and CO2 capture.
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42

Kurji, Badoor M., Iqbal M. Mujtaba, and Ammar S. Abbas. "Synthesis, Characterizations, and Recent Applications of the Silica-based Mobil Composition of Mesoporous Material: A Review." Iraqi Journal of Chemical and Petroleum Engineering 24, no. 3 (September 30, 2023): 1–12. http://dx.doi.org/10.31699/ijcpe.2023.3.1.

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Silica-based mesoporous materials are a class of porous materials with unique characteristics such as ordered pore structure, large surface area, and large pore volume. This review covers the different types of porous material (zeolite and mesoporous) and the physical properties of mesoporous materials that make them valuable in industry. Mesoporous materials can be divided into two groups: silica-based mesoporous materials and non-silica-based mesoporous materials. The most well-known family of silica-based mesoporous materials is the Mesoporous Molecular Sieves family, which attracts attention because of its beneficial properties. The family includes three members that are differentiated based on their pore arrangement. In this review, the major applications of the Mobil Mesoporous Molecular Sieves family, such as catalysts, adsorbents, and drug delivery agents, have been surveyed. Furthermore, the synthesis of the Mesoporous Molecular Sieves materials, the silica sources, the importance of templates, and the mechanisms of the synthesis are discussed herein. Members of this material family are characterized by many physicochemical properties that are closely related to their high silica content, crystalline structure, and pore arrangement. Commonly, the members of this family have large surface areas, high pore volumes, small pore sizes, and narrow and uniform particle size distributions. These properties enable numerous industrial applications and opportunities for scientific studies to further develop existing materials or manufacture new ones.
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43

Shen, Wei Hua, Jian Lin Shi, and Yu Fang Zhu. "A Facile Way to Synthesize Ordered Mesoporous Carbon Replicated by Mesoporous Silicas." Solid State Phenomena 121-123 (March 2007): 69–73. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.69.

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High ordered mesoporous carbon molecular sieves designated as CMK-3 and CMK-5 was synthesized using mesoporous silica SBA-15 as hard template, pre-polymerized furfuryl alcohol as a carbon souse by one-step impregnation. The effect of the furfuryl alcohol to silicas ratio have been investigated. XRD pattern, N2 sorption, FE-SEM, TEM, TG-DSC was used to characterize the property of the product. These results show that the CMK-3 and CMK-5 type mesoporous carbon can be controlled and facilely obtained.
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44

Zhu, Wen Jie, Yang Zhou, Wen Hui Ma, Ming Ming Li, Jie Yu, and Ke Qiang Xie. "Recovery of Mesoporous Silica from Waste Rice Husk Ash of Biomass Energy Industry." Advanced Materials Research 430-432 (January 2012): 873–76. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.873.

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In this study, the mesoporous silica material was hydrothermally synthesized from the rice husk ash of biomass energy industry with cetyltrimethylammonium bromide (CTAB) as template agents. The structure and morphology of mesoporous silica material was investigated based on the analysis of X-ray diffraction (XRD), N2 sorption/desorption (BET), Fourier transformation infra-red spectrum (FTIR). The results indicated that mesoporous silica material was successfully prepared by substituting rice husk ash for the traditional silica source of tetraethyl orthosilicate, and the mesoporous silica material displayed pore sizes in the 2-4 nm range with specific surface areas as high as 363 m2/g.
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45

Lv, Li Li, Wen Hao Geng, Chen Wang, Zhuo Ying Xie, Yuan Jin Zhao, Yuan Guan, Xu Duo Bai, and Li Guo Sun. "Pereparation of Hollow Silica Core/Mesoporous Silica Shell Monodisperse Uniform Spheres." Advanced Materials Research 668 (March 2013): 207–10. http://dx.doi.org/10.4028/www.scientific.net/amr.668.207.

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Hollow silica core/mesoporous silica shell monodisperse uniform spheres were synthesized via a dual-templating method. Specifically designed polystyrene (PS) coated by silica as the core template, while cetyltrimethylammonium bromide served as a co-template to structure the mesopore formation during tetraethoxysilane (TEOS) hydrolysis/condensation. The hollow core and mesoporous structure were formed by calcination which acts as the removable templates. Transmission electron microscopy (TEM) and scanning electronmicroscopy (SEM) investigations reveal that the morphology and hierarchical structure of the calcined mesoporous silica spheres.
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46

Popova, Margarita, Violeta Mitova, Momtchil Dimitrov, Consolato Rosmini, Ivelina Tsacheva, Pavletta Shestakova, Daniela Karashanova, Irina Karadjova, and Neli Koseva. "Mesoporous Silica with an Alveolar Construction Obtained by Eco-Friendly Treatment of Rice Husks." Molecules 29, no. 15 (July 27, 2024): 3540. http://dx.doi.org/10.3390/molecules29153540.

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The high silicon content in rice plant waste, specifically rice husks, makes this waste by-product attractive for the extraction and valorization of silicon oxide, which is widely used as an inert support in catalysis, drug delivery and molecular sieving. The procedures currently used for the treatment of plant biomass make extensive use of mineral acids (HCl, H2SO4, HNO3), which, besides them being potential environmental pollutants, reduce the yield and worsen the chemical-physical properties of the product. In this study, an evaluation of the easy treatment of rice husks by benchmarking different, more eco-friendly carboxylic acids in order to obtain a mesoporous SiO2 with an alveolar structure and a relatively high surface area and pore volume (300–420 m2/g, 0.37–0.46 cm3/g) is presented. The obtained mesoporous silicas are characterized by worm-like pores with a narrow size distribution and a maximum in the range of 3.4–3.5 nm. The mesoporous structure of the obtained materials was also confirmed by TEM. The complete removal of the organic part of the rice husks in the final materials was evidenced by thermogravimetric analysis. The high purity of the obtained mesoporous silica was detected using ICP analysis (98.8 wt. %). The structure peculiarities of the obtained mesoporous silicas were also characterized by solid-state NMR and ATR-FTIR spectroscopies. The morphology of the mesoporous silica was investigated by SEM.
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Lou, Huihui, Chong Shen, Qun Xiang, Jiaqiang Xu, and Tianjun Lou. "FDU-12 Mesoporous Materials Detection Hg (II) Ions by QCM." Nano 11, no. 08 (August 2016): 1650094. http://dx.doi.org/10.1142/s1793292016500946.

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Thiol-functionalized three-dimensional (3D) mesoporous silica FDU-12 and SBA-15 with ordered pore were prepared. All the obtained materials were characterized by small angle X-ray scattering (SAXS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Mesoporous silica FDU-12 (Fm3m) materials with various unit cell sizes, multifaceted pore were convenient for the interaction of subject and object; the 2D SBA-15 mesoporous silica materials with short and order pore channel were better than the traditional SBA-15 mesoporous silica, in which the pore channel can be used fully. 3D mesoporous silica FDU-12 is used as a sensing material to reconstruct QCM sensors to enhance the stability and this material is an ideal material to deal with heavy metal ions in water.
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48

Saikia, Diganta, Ya-Yang Huang, Cheng-En Wu, and Hsien-Ming Kao. "Size dependence of silver nanoparticles in carboxylic acid functionalized mesoporous silica SBA-15 for catalytic reduction of 4-nitrophenol." RSC Advances 6, no. 42 (2016): 35167–76. http://dx.doi.org/10.1039/c6ra01592a.

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Hou, Shushan, Xiaoju Li, Hongli Wang, Minggang Wang, Ying Zhang, Yue Chi, and Zhankui Zhao. "Synthesis of core–shell structured magnetic mesoporous silica microspheres with accessible carboxyl functionalized surfaces and radially oriented large mesopores as adsorbents for the removal of heavy metal ions." RSC Advances 7, no. 82 (2017): 51993–2000. http://dx.doi.org/10.1039/c7ra08937f.

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Core–shell structured mesoporous silica with accessible carboxyl functionalized surfaces and radial oriented large mesopores was fabricated as a recyclable adsorbent for the adsorption of Cd(ii), Cu(ii), and Pb(ii).
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50

Guo, Yingyu, Kaijun Gou, Baixue Yang, Yumei Wang, Xueyu Pu, Sanming Li, and Heran Li. "Enlarged Pore Size Chiral Mesoporous Silica Nanoparticles Loaded Poorly Water-Soluble Drug Perform Superior Delivery Effect." Molecules 24, no. 19 (September 30, 2019): 3552. http://dx.doi.org/10.3390/molecules24193552.

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Large mesopores of chiral silica nanoparticles applied as drug carrier are worth studying. In this study, chiral mesoporous silica nanoparticles (CMSN) and enlarged chiral mesoporous silica nanoparticles (E-CMSN) with a particle size from 200 to 300 nm were synthesized. Fourier transform infrared spectrometer (FTIR), circular dichroism spectrum, scanning electron microscopy (SEM), transmission electron microscope (TEM), and nitrogen adsorption/desorption measurement were adopted to explore their characteristics. The results showed that the surface area, pore volume, and pore diameter of E-CMSN were higher than those of CMSN due to enlarged mesopores. Poorly water-soluble drug nimesulide (NMS) was taken as the model drug and loaded into carriers using adsorption method. After NMS was loaded into CMSN and E-CMSN, most crystalline NMS converted to amorphous phase and E-CMSN was superior. The anti-inflammatory pharmacodynamics and in vivo pharmacokinetics results were consistent with the wetting property and in vitro drug dissolution results, verifying that NMS/E-CMSN exhibited superior NMS delivery system based on its higher oral relative bioavailability and anti-inflammatory effect because its enlarge mesopores contributed to load and release more amorphous NMS. The minor variations in the synthesis process contributed to optimize the chiral nano-silica drug delivery system.
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