Effect of ball milling on the structural and textural features of MCM-41 mesoporous material

Abu-Zied, Bahaa M.; Schwieger, Wilhelm; Asiri, Abdullah M.

doi:10.1016/j.micromeso.2015.07.012

Cited by 17 publications

(10 citation statements)

References 42 publications

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“…MCM-41 retains its initial crystallinity until 30 min of milling time. A serious loss of MCM crystallinity occurs after 1-2 h of milling, while the complete loss of crystallinity of this material is noticeable after four hours of ball milling [123]. [124] A single pore, with a diameter of ca.…”

Section: Solvent-free Methodsmentioning

confidence: 99%

Mesoporous Silica Particles as Drug Delivery Systems—The State of the Art in Loading Methods and the Recent Progress in Analytical Techniques for Monitoring These Processes

et al. 2021

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Conventional administration of drugs is limited by poor water solubility, low permeability, and mediocre targeting. Safe and effective delivery of drugs and therapeutic agents remains a challenge, especially for complex therapies, such as cancer treatment, pain management, heart failure medication, among several others. Thus, delivery systems designed to improve the pharmacokinetics of loaded molecules, and allowing controlled release and target specific delivery, have received considerable attention in recent years. The last two decades have seen a growing interest among scientists and the pharmaceutical industry in mesoporous silica nanoparticles (MSNs) as drug delivery systems (DDS). This interest is due to the unique physicochemical properties, including high loading capacity, excellent biocompatibility, and easy functionalization. In this review, we discuss the current state of the art related to the preparation of drug-loaded MSNs and their analysis, focusing on the newest advancements, and highlighting the advantages and disadvantages of different methods. Finally, we provide a concise outlook for the remaining challenges in the field.

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Section: Solvent-free Methodsmentioning

confidence: 99%

Mesoporous Silica Particles as Drug Delivery Systems—The State of the Art in Loading Methods and the Recent Progress in Analytical Techniques for Monitoring These Processes

et al. 2021

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“…The mass ratio of MWCNTs to CTAB was 4:1, while the ball milling speed was 120 r/min. After ball milling, the MWCNTs were washed with deionized water until they were neutral, filtered through a 0.4 mm microporous membrane then placed in an oven at 80 C for 6 h. 30,31 Ball-milled MWCNTs were represented as B-MWCNTs.…”

Section: Modification Of Multi-walled Carbon Nanotubesmentioning

confidence: 99%

Composite phase change materials improve the photo-thermal effects of cotton fabrics

Zhang

Shang

Weng

et al. 2020

Textile Research Journal

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We report on the impregnation-based preparation of composite phase change materials (CPCMs) with thermal storage properties, using paraffin wax and multi-walled carbon nanotubes (MWCNTs). We coated the CPCMs on the fabric by scraper coating, then evaluated their shape stability, latent heat, thermal conductivity, thermal storage stability and photo-thermal effects. Results show that CPCMs with 10% acid-oxidized MWCNTs introduce only a small phase leakage when heated at 50℃ for 900 s; their latent heat energy reduces by 16.5%, while their thermal conductivity increases by 131.9% compared to pure paraffin. When exposed to sunlight at an ambient temperature of 12.5℃, the cotton fabrics coated with CPCMs record a 12.8℃ higher surface temperature than the pristine fabric, while their heat dissipation is delayed by 120–180 s. The fabric surface temperature increases to twice the ambient temperature during daytime. Overall, these findings indicate that the coated fabric has excellent thermal stability, affirming its potential as photo-thermal functional material.

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“…In order to extract the surfactant, the sample was calcined at 600 o C for 4 h, with heating rate of 1 o C min -1 . A reference sample of MCM-41, without aluminum, was prepared following the method reported by Abu-Zied et al 14 For this, 2.5 g of CTAB were dissolved in 50 g of deionized water, in a polypropylene flask. Then, 17 mL of 28% m/m NH 3 and 76 mL of ethanol were added to the surfactant solution.…”

Section: Synthesismentioning

confidence: 99%

“…3,10 The traditional synthesis of this type of ordered mesoporous materials is based on the hydrothermal route that uses an organic source of silica, e.g., tetraethyl orthosilicate (TEOS) and a surfactant, which plays the role of the structure directing agent, and that must be removed after the silica condensation so that the mesopores become available. [11][12][13][14] Such reagents are usually expensive and the MCM-41 materials built with pure-silica are of limited use for some applications, because of the lack of acid sites and poor ion-exchange capacity. 15 Several studies have been devoted to the search of cheaper raw materials that could overcome the high costs associated with the synthesis of MCM-41.…”

Section: Introductionmentioning

confidence: 99%

Al-MCM-41 Synthesized from Kaolin via Hydrothermal Route: Structural Characterization and Use as an Efficient Adsorbent of Methylene Blue

Santos¹,

Costa²,

Oliveira³

et al. 2018

J. Braz. Chem. Soc.

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The mesoporous material Al-Mobil Composition of Matter No. 41 (Al-MCM-41) was successfully obtained from kaolin, a low cost raw material, by means of hydrothermal route. The process of synthesis of Al-MCM-41 was based on calcination of kaolin, dealumination by acid treatment, hydrothermal synthesis in alkaline medium and surfactant extraction. The characterization of the obtained mesoporous material was carried out by techniques such as: X-ray diffraction, infrared vibrational spectroscopy, 29 Si and 27 Al solid state nuclear magnetic resonance, scanning electron microscopy, transmission electron microscopy and N 2 adsorption-desorption. The X-ray diffraction at low angles allowed the determination of the cell parameter, which was 4.02 nm. The analyses of scanning and transmission electron microscopy revealed important morphological properties of the synthesized material. N 2 adsorption/desorption showed a Brunauer-Emmett-Teller (BET) specific surface area of 1,303 m 2 g-1 , pore volume of 1.23 cm 3 g-1 and average diameter of 2.45 nm. The mesoporous material presented a maximum adsorption capacity of 316 mg g-1 for the cationic dye methylene blue (MB) in a concentration typical of industrial effluents, which makes it a potential adsorbent for MB removal from wastewaters.

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Effect of ball milling on the structural and textural features of MCM-41 mesoporous material

Cited by 17 publications

References 42 publications

Mesoporous Silica Particles as Drug Delivery Systems—The State of the Art in Loading Methods and the Recent Progress in Analytical Techniques for Monitoring These Processes

Mesoporous Silica Particles as Drug Delivery Systems—The State of the Art in Loading Methods and the Recent Progress in Analytical Techniques for Monitoring These Processes

Composite phase change materials improve the photo-thermal effects of cotton fabrics

Al-MCM-41 Synthesized from Kaolin via Hydrothermal Route: Structural Characterization and Use as an Efficient Adsorbent of Methylene Blue

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