Structural and Electrical Properties of 1,8-Bis(3-hydroxypropylamino) and 1-(3-Hydroxypropylamino)–9,10-anthraquinone Films

Bedi, R. K.; Bhatia, Sonik; Kaur, Navneet; Kumar, Subodh

doi:10.1143/jjap.47.8973

Cited by 1 publication

(2 citation statements)

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“…It has been stated previously that the molecular arrangement changes upon reduction, aggregates become smaller, and the smooth layered structure is deformed. Moreover, in a previous study, it was found that the increase in the crystallite size increases the conductivity . Thus, it is thought that both the change in the conjugation of the AQ ring and the transformation of the aggregate morphology have a role in this significant conductivity decrease.…”

Section: Resultsmentioning

confidence: 91%

“…Moreover, in a previous study, it was found that the increase in the crystallite size increases the conductivity. 56 Thus, it is thought that both the change in the conjugation of the AQ ring and the transformation of the aggregate morphology have a role in this significant conductivity decrease. This decrease is such that the aggregates switch from significantly conductive to almost insulative.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Dual-Responsive Lipid Nanotubes: Two-Way Morphology Control by pH and Redox Effects

Unsal¹,

Schmidt

Talmon

et al. 2016

Langmuir

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Lipid nanotubes are the preferred structures for many applications, especially biological ones, and thus have attracted much interest recently. However, there is still a significant need for developing more lipid nanotubes that are reversibly controllable to improve their functionality and usability. Here, we presented a two-way reversible morphology control of the nanotubes formed by the recently designed molecule AQUA (C25H29NO4). Because of its special design, the AQUA has both pH-sensitive and redox-active characters provided by the carboxylic acid and anthraquinone groups. Upon chemical reduction, the nanotubes turned into thinner ribbons, and this structural transformation was significantly reversible. The reduction of the AQUA nanotubes also switched the nanotubes from electrically conductive to insulative. Nanotube morphology can additionally be altered by decreasing the pH below the pKa value of the AQUA, at ∼4.9. Decreasing the pH caused the gradual unfolding of the nanotubes, and the interlayer distance in the nanotube's walls increased. This morphological change was fast and reversible at a wide pH range, including the physiological pH. Thus, the molecular design of the AQUA allowed for an unprecedented two-way and reversible morphology control with both redox and pH effects. These unique features make AQUA a very promising candidate for many applications, ranging from electronics to controlled drug delivery.

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Section: Resultsmentioning

confidence: 91%

Section: ■ Results and Discussionmentioning

confidence: 99%