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![SEM images of a MCM-41-[HDTMA][Br] (control); b MCM-41-[HDTMA][OAc]; c MCM-41-[HDTMA][BF4]; d MCM-41-[DDTMA][OAc]; e MCM-41-[DDTMA][BF4]; f MCM-41-[DDA][OAc] and g MCM-41-[DDA][BF4]](publication/319652194/figure/fig1/AS:961844311228442@1606332962840/SEM-images-of-a-MCM-41-HDTMABr-control-b-MCM-41-HDTMAOAc-c.jpg)
SEM images of a MCM-41-[HDTMA][Br] (control); b MCM-41-[HDTMA][OAc]; c MCM-41-[HDTMA][BF4]; d MCM-41-[DDTMA][OAc]; e MCM-41-[DDTMA][BF4]; f MCM-41-[DDA][OAc] and g MCM-41-[DDA][BF4]
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![SEM images of a MCM-41-[HDTMA][Br] (control); b MCM-41-[HDTMA][OAc]; c...](publication/319652194/figure/fig1/AS:961844311228442@1606332962840/SEM-images-of-a-MCM-41-HDTMABr-control-b-MCM-41-HDTMAOAc-c_Q320.jpg)
Six surface active compounds containing: hexadecyltrimethylammonium [HDTMA], dodecyltrimethylammonium [DDTMA] or didecyldimethylammonium [DDA] cation and tetrafluoroborate [BF4] or acetate [OAc] anion were synthesized, purified and characterized, and subsequently applied for the synthesis of mesoporous silica materials of MCM-41 type. The materials...
Citations
... AcILs also have other potential applications, such as lubricants, enhancers and CIs. Additionally, AcILs can be used for electrospinning to synthesize fibers, cross-linking with organic solvents to prepare membranes, and also as microemulsions for drug delivery or as working pairs with good performance in low temperature driven sorption heat pump (SHP) systems, etc. [17,18,[203][204][205][206][207][208][209][210][211]. [OAc] as electrolyte [199] Content courtesy of Springer Nature, terms of use apply. ...
Acetate-based ionic liquids (AcILs), as a kind of typical carboxylate-based ILs, display excellent structure tunability, non-volatility, good solubility to biomass, and favorable adsorption capacity, etc. These unique characteristics of AcILs make them important candidates for a range of applications in the field of energy and in the petrochemical industry. This paper intends to provide a comprehensive overview of recent advances in AcILs, including pure AcILs, AcIL-based multi-solvents, and AcIL-based composites, etc. Preparation methods, with one- and two-step synthesis, are reviewed. The relationship between properties and temperature is discussed, and some physical and thermodynamic properties of different AcILs are summarized and further calculated. The applications of AcILs in the fields of biomass processing, organic synthesis, separation, electrochemistry, and other fields are reviewed based on their prominent properties. Thereinto, the dual functions of AcILs as solvents and activators for biomass dissolution are discussed, and the roles of AcILs as catalysts and reaction mediums in clean organic synthesis are highlighted. Meanwhile, the reaction mechanisms of AcILs with acid gases are posed by means of molecular simulation and experimental characterization. Moreover, AcILs as electrolytes for zinc batteries, supercapacitors, and electrodeposition are particularly introduced. Finally, the future research challenges and prospects of AcILs are presented.
... Using both direct and grafting methods, MCM-41 materials containing the following metals were successfully synthesized: Mo [17], Ni [18], Co [19], Ga [20], Zr [21], Cu [22], Pd [23] or Fe [24]. In addition, studies were conducted on the conditions for obtaining the siliceous structure of MCM-41 (including Ti-MCM-41), so that the obtained material was characterized by greater stability in water at elevated temperatures and an ability to inhibit the phenomenon of metal leaching (Ti leaching in the case of Ti-MCM-41 catalysts) [25,26]. ...
... Using both direct and grafting methods, MCM-41 materials containing the following metals were successfully synthesized: Mo [17], Ni [18], Co [19], Ga [20], Zr [21], Cu [22], Pd [23] or Fe [24]. In addition, studies were conducted on the conditions for obtaining the siliceous structure of MCM-41 (including Ti-MCM- 41), so that the obtained material was characterized by greater stability in water at elevated temperatures and an ability to inhibit the phenomenon of metal leaching (Ti leaching in the case of Ti-MCM-41 catalysts) [25,26]. ...
Titanium-containing mesoporous silica catalysts with different Ti contents were prepared by the sol-gel method, whereby the molar ratios of silicon to titanium in the crystallization gel amounted to, respectively, 40:1, 30:1, 20:1 and 10:1. The produced Ti-MCM-41 materials were characterized by the following instrumental methods: XRD, UV-Vis, FT-IR, SEM, and XRF. Textural parameters were also determined for these materials by means of the N 2 adsorption/desorption method. The activities of these catalysts were investigated in the α-pinene isomerization process. The most active catalyst was found to be the material with the molar ratio of Si:Ti equal to 10:1, which contained 12.09 wt% Ti. This catalyst was used in the extended studies on the α-pinene isomerization process, and the most favorable conditions for this reaction were found to be temperature of 160 • C, reaction time of 7 h, with the catalyst composition of 7.5 wt% relative to α-pinene. These studies showed that the most active catalyst, at the best reaction conditions, allowed for the attainment of 100% conversion of α-pinene over a period of 7 h. After this time the selectivities (in mol%) of the main products were as follows: camphene (35.45) and limonene (21.32). Moreover, other products with lower selectivities were formed: γ-terpinene (4.38), α-terpinene (8.12), terpinolene (11.16), p-cymene (6.61), and α-phellandrene (1.58).
... Nano-Zeo material was synthesised by a twostep procedure. In the first step, MCM-41 silica with spherical morphology was synthesised using TEOS as a silica source and hexadecyltrimethylammonium bromide as a structure-directing reagent [7]. Then, in the second step, the obtained MCM-41 spheres were treated with a dilute solution of tetrapropylammonium hydroxide and densified for 24 h at 383 K via a steam-assisted crystallisation under hydrothermal conditions [6]. ...
Porous inorganic materials have been extensively applied as enzyme carriers due to their high mechanic stability and high specific surface area, resistance to microbial attack, stability in organic solvents, and stability upon heating. In recent years, enzymes immobilised on nanosized materials have attracted scientist attention with regard to new emerging applications such as biosensing and medical diagnostics. This research aims to investigate the potential of a nanosized and mostly mesoporous zeolite (nano-Zeo) as a suitable carrier for lipase from porcine pancreas (PPL). For comparative purpose, a nanosized MCM-41 silica material with spherical morphology was studied. The latter was used as a starting material to prepare the nanosized zeolite by densification of the initial amorphous MCM-41 silica nanospheres in presence of a diluted solution of tetrapropylammonium hydroxide, the nanospheres being further transformed into MFI-type of zeolite via steam-assisted crystallisation. Both the starting material and the nano-Zeo particles were characterised by means of X-ray diffraction, nitrogen physisorption, and scanning electron microscopy techniques. Loaded protein amount was comparable for the two carriers: 64.0±2.3 and 80.4±3.4 mg/g for MCM-41 and nano-Zeo, respectively. However, nano-Zeo showed over twofold higher specific loading with regard to the mesoporous specific surface area of the studied materials. Besides, monolayer surface distribution and a higher specific lipase activity were estimated for the nano-Zeo-PPL preparation, which is probably due to lipase molecules attached in a proper orientation. © 2018 Bulgarian Academy of Sciences, Union of Chemists in Bulgaria.
Magnetic mesoporous materials have attracted great interest due to their combined property of magnetic nanomaterials and mesoporous materials as well as their potential applications in catalysis, bioenrichment, drug delivery, nanoreactors, etc. In this study, one-dimensional (1D) pod-like magnetic mesoporous silica nanochains with tunable hollow space ([email protected]@[email protected] nanochain named as PL-MMS nanochain) are rationally synthesized for the first time through a controlled magnetic-induced interface coassembly approach. The obtained PL-MMS possess tunable diameter (300-500 nm), large and perpendicular mesopores (8.2 nm) in the outer shell, silica-protected magnetic responsive core and high surface area (325 m2 g-1). Benefiting from the large voids and unique mesopores, these mesoporous nanochains exhibit superior performance in enzyme (lipase with a size of 4.0 nm) immobilization with a high loading capacity of 223 μg/mg and the immobilized lipase demonstrates enhanced catalytic activity in different pH and temperatures as well as excellent tolerance of organic solvent.
