Eco-friendly approach for preparation of hybrid silica aerogel via freeze drying method

Zhai, Shengnan; Yu, Kejing; Meng, Chaoran; Wang, Hongbo; Fu, Jiajia

doi:10.1007/s10853-021-06835-9

Cited by 10 publications

(4 citation statements)

References 32 publications

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“…The reaction begins the moment the SA microspheres touch the Ca 2+ solution, but because the reaction is slow, the Ca 2+ concentration is often increased to speed up the reaction. In this study, the effect of Ca 2+ concentration on aerogels was investigated by taking three different concentrations of Ca 2+ into a hydrogel and then freeze-drying − to obtain aerogels, which can be seen in Figure (S1). The aerogels formed at 1 and 10% had protrusions and were not well-rounded, while the aerogels that formed at 5% were rounded and well-rounded.…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Chen,

Qu,

et al. 2023

Langmuir

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With the frequent occurrence of offshore oil spills, the effective separation and treatment of oily wastewater are essential to the environment. In this work, the core–shell bioreactor (abbreviated as Fe3O4/MHNTs-CNF@aerogel) was prepared with a core composed of camphor leaf cellulose-based aerogels for loading microorganisms and a shell derived from hydrophobic silane-modified halloysite doping with Fe3O4 for selective absorption of oil and maganetic recycling. The core–shell-structured bioreactor Fe3O4/MHNTs-CNF@aerogel has excellent self-floating properties and can float on water for up to 100 days. The whole core–shell structure not only has excellent oil/water separation performance but also has good microbial degradation performance. By applying it in water containing 5% diesel for the biodegradation test, the biodegradation efficiency of Fe3O4/MHNTs-CNF@aerogel for diesel can reach 82.4% in 10 days. The efficiency was 20% higher than for free microorganisms, and it still had excellent degradation ability after three degradation cycles, with a degradation rate of over 75%. In addition, the result obtained from the study on environmental tolerance shows that Fe3O4/MHNTs-CNF@aerogel possessed a strong tolerance ability under different pH and salinity conditions. The Fe3O4/MHNTs-CNF@aerogel also has superior mechanical properties; i.e., nearly no deformation occurs at 30 kPa. Compared with those conventional oil/water separation materials which can only absorb or separate the oils for water with limited capacity and taking the risk of secondary contamination, our core–shell-structured bioreactor is capable of not only selectively absorbing oil from water through its hydrophobic shell but also degrading it into a nontoxic substance by its microorganism-loaded core, thus showing great potential for practical application in oily wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Chen,

Qu,

et al. 2023

Langmuir

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“…In contrast, the freeze-drying approach could produce aerogel with highly porous and minimal distortion. This method is known as simple, economically cost and environmentally friendly [ 55 ]. It retains the wet-gel rheology in solid state [ 56 ].…”

Section: Synthesis and Preparation Of Aerogelsmentioning

confidence: 99%

Emerging Trends in Nanotechnology: Aerogel-Based Materials for Biomedical Applications

et al. 2023

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At present, aerogel is one of the most interesting materials globally. The network of aerogel consists of pores with nanometer widths, which leads to a variety of functional properties and broad applications. Aerogel is categorized as inorganic, organic, carbon, and biopolymers, and can be modified by the addition of advanced materials and nanofillers. Herein, this review critically discusses the basic preparation of aerogel from the sol–gel reaction with derivation and modification of a standard method to produce various aerogels for diverse functionalities. In addition, the biocompatibility of various types of aerogels were elaborated. Then, biomedical applications of aerogel were focused on this review as a drug delivery carrier, wound healing agent, antioxidant, anti-toxicity, bone regenerative, cartilage tissue activities and in dental fields. The clinical status of aerogel in the biomedical sector is shown to be similarly far from adequate. Moreover, due to their remarkable properties, aerogels are found to be preferably used as tissue scaffolds and drug delivery systems. The advanced studies in areas including self-healing, additive manufacturing (AM) technology, toxicity, and fluorescent-based aerogel are crucially important and are further addressed.

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“…The third method is the freeze-drying of gels [20,32,33]. To execute this method, the liquid within the gel is frozen and then subjected to sublimation under vacuum conditions.…”

Section: Introductionmentioning

confidence: 99%

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

Borisov,

Kalinina,

Bystrova

et al. 2023

Polymers

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Aerogels are a class of materials that have gained increasing attention over the past several decades due to their exceptional physical and chemical properties. These materials are highly porous, with a low density and high surface area, allowing for applications such as insulation, catalysis, and energy storage. However, traditional aerogels, such as pure silica aerogels, suffer from brittleness and fragility, which limit their usefulness in many applications. Herein, we have addressed this problem by using organosilicon compounds, namely polymethylsilsesquioxane derivatives, for the synthesis of aerogel-like materials. Specifically, we have developed a novel approach involving surfactant-free synthesis of microcapsules from partially PEGylated hyperbranched polymethylethoxysiloxane. Due to the highly diphilic nature of these compounds, they readily concentrate at the oil/water interface in aqueous emulsions encapsulating oil droplets. During the subsequent condensation, the organosilicon precursor is consumed for hexane encapsulation (yielding hollow microcapsules) followed by the formation of a continuous condensed phase. Concurrently, methyl groups ensure the hydrophobicity of the resulting materials, which eliminates the need of using additional reagents for their hydrophobization.

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Eco-friendly approach for preparation of hybrid silica aerogel via freeze drying method

Cited by 10 publications

References 32 publications

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Preparation of a Magnetic Core–Shell Bioreactor for Oil/Water Separation and Biodegradation

Emerging Trends in Nanotechnology: Aerogel-Based Materials for Biomedical Applications

Aerogel-Like Material Based on PEGylated Hyperbranched Polymethylethoxysiloxane

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