Halloysite Nanotubes: Controlled Access and Release by Smart Gates.

Autor:	Cavallaro G; Dipartimento di Fisica e Chimica, Università degli Studi di Palermo Viale delle Scienze, pad. 17, 90128 Palermo, Italy. giuseppe.cavallaro@unipa.it., Danilushkina AA; Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, 420008 Republic of Tatarstan, Russia. anchutka124@gmail.com., Evtugyn VG; Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, 420008 Republic of Tatarstan, Russia. vevtugyn@gmail.com., Lazzara G; Dipartimento di Fisica e Chimica, Università degli Studi di Palermo Viale delle Scienze, pad. 17, 90128 Palermo, Italy. giuseppe.lazzara@unipa.it., Milioto S; Dipartimento di Fisica e Chimica, Università degli Studi di Palermo Viale delle Scienze, pad. 17, 90128 Palermo, Italy. stefana.milioto@unipa.it., Parisi F; Dipartimento di Fisica e Chimica, Università degli Studi di Palermo Viale delle Scienze, pad. 17, 90128 Palermo, Italy. filippo.parisi@unipa.it., Rozhina EV; Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, 420008 Republic of Tatarstan, Russia. rozhinaelvira@gmail.com., Fakhrullin RF; Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, 420008 Republic of Tatarstan, Russia. kazanbio@gmail.com.
Jazyk:	angličtina
Zdroj:	Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2017 Jul 28; Vol. 7 (8). Date of Electronic Publication: 2017 Jul 28.
DOI:	10.3390/nano7080199
Abstrakt:	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. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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