Intercalated Polyaniline/Halloysite Nanocomposites by a Solvent-Free Mechanochemical Method

Zheng, Hao; Cheng, Huijun; Zhou, Lu; Ye, Ying; Chen, Jianfang

doi:10.1142/s1793292016501125

Cited by 2 publications

(2 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For optimal loading the whole cycle was repeated three times (additional cycles can be used to further increase loading). The composite solid HNT/AH 2 was characterized by thermogravimetric analysis (TGA) with the aim to assess the real content of the antioxidant within the modified halloysite, as reported in the recent literature for similar products [33,43,44,45]. HNT/AH 2 was analyzed by TGA, together with the unmodified sample (HNT) and the pristine AH 2 , as a reference.…”

Section: Resultsmentioning

confidence: 99%

“…Then, upon switching the atmosphere to air and raising the temperature up to 800 °C the degradation of all the organic and structural components occurs. As shown in Figure 1B, the HNT thermogram displays two weight losses: the first one around 100 °C (1–2%wt, 0–10 min) ascribed to the evaporation of water absorbed on the surface of the sample and the second one (13.8%wt), at about 500 °C (70–90 min), related to the loss of constitutional water [44,45]. The HNT/AH 2 shows, besides the previously discussed weight losses, an additional degradation step, located in the 180–400 °C temperature range (40–70 min., partially overlapping the subsequent weight loss), which covers not only the structural water release, but also the ascorbic acid degradation, in agreement with the previously discussed TGA profile of pristine AH 2 (Figure 1A).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Antioxidant Activity under Biomimetic Settings of Ascorbic Acid Included in Halloysite Nanotubes

et al. 2019

View full text Add to dashboard Cite

Antioxidant activity of native vitamin C (ascorbic acid, AH2) is hampered by instability in solution. Selective loading of AH2 into the inner lumen of natural halloysite nanotubes (HNT) yields a composite nanoantioxidant (HNT/AH2), which was characterized and investigated for its reactivity with the persistent 1,1-diphenyl-2-picrylhydrazyl (DPPH•) radical and with transient peroxyl radicals in the inhibited autoxidation of organic substrates, both in organic solution (acetonitrile) and in buffered (pH 7.4) water in comparison with native AH2. HNT/AH2 showed excellent antioxidant performance being more effective than native ascorbic acid by 131% in acetonitrile and 290% (three-fold) in aqueous solution, under identical settings. Reaction with peroxyl radicals has a rate constant of 1.4 × 106 M−1 s−1 and 5.1 × 104 M−1 s−1, respectively, in buffered water (pH 7.4) and acetonitrile, at 30 °C. Results offer physical understanding of the factors governing HNT/AH2 reactivity. Improved performance of HNT/AH2 is unprecedented among forms of stabilized ascorbic acid and its relevance is discussed on kinetic grounds.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced Antioxidant Activity under Biomimetic Settings of Ascorbic Acid Included in Halloysite Nanotubes

et al. 2019

View full text Add to dashboard Cite

show abstract

Mechanochemical methods for the preparation of intercalation compounds, from intercalation to the formation of layered double hydroxides

et al. 2018

View full text Add to dashboard Cite

Due to increasing interest in the development of advanced nanomaterials from nanosheets as building blocks, methods for the preparation of nanosheet materials and their hybrids have been studied carefully and extensively. In this review, studies of mechanochemical methods (solid-solid reactions under ambient conditions or solvent-free synthesis) for the preparation of intercalation compounds are summarized. Mechanochemical reactions without using solvent have operational advantages, such as their environmentally benign nature and the fact that separating and drying the products is not necessary. In addition to their advantages from green chemistry viewpoints, solid-state reactions have potential for the preparation of novel intercalation compounds which are not accessible by conventional solution-based methods.

show abstract

Intercalated Polyaniline/Halloysite Nanocomposites by a Solvent-Free Mechanochemical Method

Abstract: This article has been retracted. A statement of retraction is published in Nano Volume 11, Issue 12 (2016).

Cited by 2 publications

References 53 publications

Enhanced Antioxidant Activity under Biomimetic Settings of Ascorbic Acid Included in Halloysite Nanotubes

Enhanced Antioxidant Activity under Biomimetic Settings of Ascorbic Acid Included in Halloysite Nanotubes

Mechanochemical methods for the preparation of intercalation compounds, from intercalation to the formation of layered double hydroxides

Contact Info

Product

Resources

About