Vacuum-dried, low-density and robust hydrophobic bridged silsesquioxane aerogels for oil–water separation

Zhao, Peijian; Wang, Linlin; Xie, Lefu; Li, Lei; Feng, Shengyu

doi:10.1007/s10853-021-06781-6

Cited by 2 publications

(3 citation statements)

References 50 publications

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“…The very weak bands at about 3545 cm −1 and 1647 cm −1 suggest the presence of traces of interlayer water molecules, not detectable with the XRPD technique [ 56 ]. The APTES spectrum ( Figure 2 I,II ( b )) matches the literature data [ 61 ]. The most relevant signals, detectable also in the H_A spectrum ( Figure 2 I,II ( c )) are those associated with C-H stretching of APTES backbone and ethoxy groups, in the range 2800–3000 cm −1 , and those attributed to NH 2 and NH 3 + bending at 1440 and 1482 cm −1 , respectively [ 62 , 63 ].…”

Section: Resultssupporting

confidence: 82%

Design of Etched- and Functionalized-Halloysite/Meloxicam Hybrids: A Tool for Enhancing Drug Solubility and Dissolution Rate

Friuli,

Urru,

Ferrara

et al. 2024

Pharmaceutics

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The study focuses on the synthesis and characterization of Meloxicam–halloysite nanotube (HNT) composites as a viable approach to enhance the solubility and dissolution rate of meloxicam, a poorly water-soluble drug (BCS class II). Meloxicam is loaded on commercial and modified halloysite (acidic and alkaline etching, or APTES and chitosan functionalization) via a solution method. Several techniques (XRPD, FT-IR, 13C solid-state NMR, SEM, EDS, TEM, DSC, TGA) are applied to characterize both HNTs and meloxicam–HNT systems. In all the investigated drug–clay hybrids, a high meloxicam loading of about 40 wt% is detected. The halloysite modification processes and the drug loading do not alter the structure and morphology of both meloxicam and halloysite nanotubes, which are in intimate contact in the composites. Weak drug–clay and drug-functionalizing agent interactions occur, involving the meloxicam amidic functional group. All the meloxicam–halloysite composites exhibit enhanced dissolution rates, as compared to meloxicam. The meloxicam–halloysite composite, functionalized with chitosan, showed the best performance both in water and in buffer at pH 7.5. The drug is completely released in 4–5 h in water and in less than 1 h in phosphate buffer. Notably, an equilibrium solubility of 13.7 ± 4.2 mg/L in distilled water at 21 °C is detected, and wettability dramatically increases, compared to the raw meloxicam. These promising results can be explained by the chitosan grafting on the outer surface of halloysite nanotubes, which provides increased specific surface area (100 m2/g) disposable for drug adsorption/desorption.

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Section: Resultssupporting

confidence: 82%

Design of Etched- and Functionalized-Halloysite/Meloxicam Hybrids: A Tool for Enhancing Drug Solubility and Dissolution Rate

Friuli,

Urru,

Ferrara

et al. 2024

Pharmaceutics

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“…However, their inherent brittleness and poor mechanical properties remain one of the most urgent issues that must be addressed to enhance their suitability for different potential applications. , Therefore, researchers are actively working on improving the mechanical strength of silica aerogels while maintaining their intrinsic characteristics. Consequently, several methods have been devised to address these shortcomings, mainly by combining silica aerogels with other materials, including polymers, − molecular linkers, , and several other fillers and fibers. , These additives improved the mechanical strength of silica-aerogel-based composites for an expanded range of applications, making them even more versatile materials with widespread use across multiple industries. As an example, our recently published paper demonstrates that the inclusion of silica aerogels into flexible open-cell melamine foams (MFs) can significantly boost their mechanical properties, durability, and structural strength.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Therefore, researchers are actively working on improving the mechanical strength of silica aerogels while maintaining their intrinsic characteristics. Consequently, several methods have been devised to address these shortcomings, mainly by combining silica aerogels with other materials, including polymers, 14−16 molecular linkers, 17,18 and several other fillers and fibers. 19,20 These additives improved the mechanical strength of silica-aerogel-based composites for an expanded range of applications, making them even more versatile materials with widespread use across multiple industries.…”

Section: ■ Introductionmentioning

confidence: 99%

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

Fashandi,

Rejeb,

Naguib

et al. 2024

ACS Appl. Mater. Interfaces

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Silica aerogels exhibit exceptional characteristics such as mesoporosity, light weight, high surface area, and pore volume. Nevertheless, their utilization in industrial settings remains constrained due to their brittleness, moisture sensitivity, and costly synthesis procedure. Several studies have proved that adding nanofillers, such as carbon nanotubes (CNT) or graphene nanoplatelets (GNP), can improve the mechanical strength of the aerogels. The incorporation of nanofillers is often accompanied by agglomeration and pore blockage, which, in turn, deteriorates the surface area, pore volume, and low density. Including flexible melamine foam (MF) as a scaffold for the silica aerogel and nanofiller composite can prevent the restacking of the nanofillers through π−π interaction, hence maintaining the incredible properties of aerogels and improving their mechanical properties. CNT, GNP, and the polymeric silica precursor, polyvinyltrimethoxysilane (PVTMS), were added to a MF, at varying concentrations, to fabricate the MF-aerogel nanocomposites. Surfactant and sonication were utilized to ensure a homogeneous dispersion of the nanofillers in the system. The presence of MF prevented the agglomeration of nanofillers, resulting in lower density and relatively higher surface properties (S BET up to 929 m 2 •g −1 and pore volume up to 4.34 cc•g −1 ). Moreover, the MF-supported samples could endure 80% strain without breakage and showed an outstanding compressive strength of up to ∼20 MPa. These aerogel nanocomposites also demonstrated an excellent volatile organic compound (∼2680 mg•g −1 ) and cationic dye adsorption (∼10 mg•g −1 ).

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Vacuum-dried, low-density and robust hydrophobic bridged silsesquioxane aerogels for oil–water separation

Cited by 2 publications

References 50 publications

Design of Etched- and Functionalized-Halloysite/Meloxicam Hybrids: A Tool for Enhancing Drug Solubility and Dissolution Rate

Design of Etched- and Functionalized-Halloysite/Meloxicam Hybrids: A Tool for Enhancing Drug Solubility and Dissolution Rate

Melamine Network as a Solution for Significant Enhancement of the Mechanical, Adsorptive, and Surface Properties in a Novel Carbon Nanomaterial–Silica Aerogel Composite

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