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Open AccessArticle

Halloysite Nanotubes: Controlled Access and Release by Smart Gates

1
Dipartimento di Fisica e Chimica, Università degli Studi di Palermo Viale delle Scienze, pad. 17, 90128 Palermo, Italy
2
Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, 420008 Republic of Tatarstan, Russia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2017, 7(8), 199; https://doi.org/10.3390/nano7080199
Received: 23 June 2017 / Revised: 25 July 2017 / Accepted: 26 July 2017 / Published: 28 July 2017
(This article belongs to the Special Issue Polymer Nanocomposites)
Hollow halloysite nanotubes have been used as nanocontainers for loading and for the triggered release of calcium hydroxide for paper preservation. A strategy for placing end-stoppers into the tubular nanocontainer is proposed and the sustained release from the cavity is reported. The incorporation of Ca(OH)2 into the nanotube lumen, as demonstrated using transmission electron microscopy (TEM) imaging and Energy Dispersive X-ray (EDX) mapping, retards the carbonatation, delaying the reaction with CO2 gas. This effect can be further controlled by placing the end-stoppers. The obtained material is tested for paper deacidification. We prove that adding halloysite filled with Ca(OH)2 to paper can reduce the impact of acid exposure on both the mechanical performance and pH alteration. The end-stoppers have a double effect: they preserve the calcium hydroxide from carbonation, and they prevent from the formation of highly basic pH and trigger the response to acid exposure minimizing the pH drop-down. These features are promising for a composite nanoadditive in the smart protection of cellulose-based materials. View Full-Text
Keywords: halloysite; nanocomposite; cellulose; controlled release halloysite; nanocomposite; cellulose; controlled release
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MDPI and ACS Style

Cavallaro, G.; Danilushkina, A.A.; Evtugyn, V.G.; Lazzara, G.; Milioto, S.; Parisi, F.; Rozhina, E.V.; Fakhrullin, R.F. Halloysite Nanotubes: Controlled Access and Release by Smart Gates. Nanomaterials 2017, 7, 199. https://doi.org/10.3390/nano7080199

AMA Style

Cavallaro G, Danilushkina AA, Evtugyn VG, Lazzara G, Milioto S, Parisi F, Rozhina EV, Fakhrullin RF. Halloysite Nanotubes: Controlled Access and Release by Smart Gates. Nanomaterials. 2017; 7(8):199. https://doi.org/10.3390/nano7080199

Chicago/Turabian Style

Cavallaro, Giuseppe; Danilushkina, Anna A.; Evtugyn, Vladimir G.; Lazzara, Giuseppe; Milioto, Stefana; Parisi, Filippo; Rozhina, Elvira V.; Fakhrullin, Rawil F. 2017. "Halloysite Nanotubes: Controlled Access and Release by Smart Gates" Nanomaterials 7, no. 8: 199. https://doi.org/10.3390/nano7080199

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