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Carbon nanomaterials with high electrical conductivity, good chemical, and mechanical stability have attracted increasing attentions and shown wide applications in recent years. In particularly, hollow carbon nanomaterials, which possess ultrahigh specific surface area, large surface-to-volume ratios, and controllable pore size distribution, will b...
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... Furthermore, hollow mesoporous carbon nanomaterials have proven their good performance in different fields due to their high specific surface area, high aspect ratio, high thermal stability, good electron transport capability, flexible shape and structure, and large vacancy for mass loading [5]. Based on the structure, the hollow carbon nanomaterials could be presented as hollow nanofibers, nanocages, bowl-like, MOF-based, spheres with hard templates, or spheres without templates [6]. The hollow structure could be achieved using three preparation methods such as soft, hard, and self-templating combined with several techniques such as etching, nano casting, chemical vapor deposition, layer-by-layer assembly, spray pyrolysis, etc. [7]. ...
In recent years, hollow structured nanomaterials owe high attention to research, especially when applied to organic coatings due to their high surface area, loading capacity, and flexible shape and structure. Towards this direction, mesoporous hollow carbon nanospheres (MPHS) have been synthesized using the self-assembly method with an average diameter of 280 nm using silica particles as a hard template. The etching of the sil-ica cores was carried out using alkaline etching with NaOH which effectively removed the cores as confirmed by the EDX and FTIR. The MPHS has BET surface area, pore volume, and pore radius of 830.8 m 2 /g, 1.1 cc/g, and 3.4 nm respectively which support the loading of diethylenetriamine (DETA). The DETA acts as a corrosion inhibitor, surface modifier, and hardener loaded into MPHS with a high loading rate (44 %) to develop MPHS@ DETA. 3 wt% of the MPHS@ DETA was blended with an epoxy coating (MPHS@ DETA-EP) as an anti-corrosion pigment and then the properties of the developed epoxy coatings were systematically characterized. The developed MPHS@ DETA-EP shows excellent anti-corrosion behavior after continuous exposure to corrosive media for 40 days making the coating suitable for several industrial applications.
... In fact, this is a common problem faced by MONs in many applications. With the gradual understanding of the growth mechanism and microstructure of nanocrystals by researchers, hollow nanomaterials have become one of the hot spots in modern nanoscience research [30][31][32]. To enhance the adsorption capacity while increasing the utilization of interior pores, current research has become increasingly focused on HMONs. ...
Aflatoxin (AFT) contamination, commonly in foods and grains with extremely low content while high toxicity, has caused serious economic and health problems worldwide. Now researchers are making an effort to develop nanomaterials with remarkable adsorption capacity for the identification, determination and regulation of AFT. Herein, we constructed a novel hollow-structured microporous organic networks (HMONs) material. On the basis of Fe3O4@MOF@MON, hydrofluoric acid (HF) was introduced to remove the transferable metal organic framework (MOF) to give hollow MON structures. Compared to the original Fe3O4@MOF@MON, HMON showed improved surface area and typical hollow cavities, thus increasing the adsorption capacity. More importantly, AFT is a hydrophobic substance, and our constructed HMON had a higher water contact angle, greatly enhancing the adsorption affinity. From that, the solid phase extraction (SPE-HPLC) method developed based on HMONs was applied to analyze four kinds of actual samples, with satisfied recoveries of 85–98%. This work provided a specific and sensitive method for the identification and determination of AFT in the food matrix and demonstrated the great potential of HMONs in the field of the identification and control of mycotoxins.
样品前处理技术在复杂样品(如生物、食品和环境等样品)的分析过程中起着至关重要的作用,是整个分析过程的关键,其主要目的是使待测物与样品基质或样品中的干扰物质分离,并达到仪器可以分析检测的状态。对于样品前处理技术而言,有着优异吸附性能的吸附剂是核心和关键,因此开发具有高选择性和高富集性的吸附材料是该技术目前面临的最大挑战。近年来,各类性能优异的纳米材料被应用于样品前处理领域,发展了众多具有功能多样化、高选择性、高富集性的纳米萃取材料。中空纳米材料是一类在固体壳内具有很大空隙的纳米粒子,因有较大的有效表面积、丰富的内部空间、短的质量传输路径和较高的承载能力等优点,在样品前处理领域表现出了巨大的应用潜力,其主要是通过π-π堆积、静电、氢键以及疏水作用等相互之间的协同作用实现对目标分析物的高效分离和富集。同时由于中空纳米材料优异的物理化学性能,也获得了各个研究领域的广泛关注,成为材料科学的研究前沿。但是,中空纳米材料的合成方法仍存在步骤复杂、成本较高、条件相对严苛、涉及剧毒物质等问题。本文总结了中空纳米材料的主要类型、合成方法以及在样品前处理中的研究进展,探讨了中空纳米材料在合成方法上遇到的挑战。最后,对中空纳米材料在样品前处理中的应用及发展进行了展望。
Graphitic one‐dimensional (1D) and hybrid nanomaterials represent a powerful solution in composite and electronic applications due to exceptional properties, but large‐scale synthesis of hybrid materials has yet to be realized. Here, we report a rapid, scalable method to produce graphitic 1D materials from polymers using flash Joule heating (FJH). This avoids lengthy chemical vapor deposition and uses no solvent or water. The flash 1D materials (F1DM), synthesized using a variety of earth‐abundant catalysts, have controllable diameters and morphologies by parameter tuning. Furthermore, the process can be modified to form hybrid materials, with F1DM bonded to turbostratic graphene. In nanocomposites, F1DM outperform commercially available carbon nanotubes. Compared to current 1D material synthetic strategies using life cycle assessment, FJH synthesis represents an 86–92% decrease in cumulative energy demand and 92–94% decrease in global warming potential. Our work suggests that FJH affords a cost‐effective and sustainable route to upcycle waste plastic into valuable 1D and hybrid nanomaterials. This article is protected by copyright. All rights reserved
