Formation of chiral nanotubes by the novel anthraquinone containing-achiral molecule

Unsal, Hande; Aydoğan, Nihal

doi:10.1016/j.jcis.2012.12.023

Cited by 12 publications

(18 citation statements)

References 55 publications

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“…Previous studies have shown that Au(III) can be reduced by hydroquinones (reduction product of the AQ group under specific conditions) in the presence of NaOH above pH 7.0 at room temperature and that increasing the pH increases the reducing power of the hydroquinones . The AQua molecule does not have a hydroquinone group under the conditions studied here; however, AQ groups on the LNT surfaces are mostly in their resonance state . In the resonance state, due to the existence of an amino group at the 1 position in the AQ ring, the quinone oxygen gains an electron from the amino nitrogen and becomes negatively charged .…”

Section: Resultssupporting

confidence: 54%

“…The AQua molecule does not have a hydroquinone group under the conditions studied here; however, AQ groups on the LNT surfaces are mostly in their resonance state . In the resonance state, due to the existence of an amino group at the 1 position in the AQ ring, the quinone oxygen gains an electron from the amino nitrogen and becomes negatively charged . This turns the quinone oxygen into a potential electron donor for Au(III) salt.…”

Section: Resultsmentioning

confidence: 99%

“…We fabricated smart, stimuli‐responsive LNTs (Figure S1b) using a specially designed molecule (AQNH‐(CH 2 ) 10 COOH), containing anthraquinone and carboxylic acid functional groups, hereafter referred to as AQua (Figure S1a). AQua lipid nanotubes were used as the organic constituent to obtain hybrid structures due to their simple production, durability, multi‐functionality (both pH‐sensitive and redox active), self‐organization ability, high encapsulation performance, and low toxicity . In‐situ transformation of the Au(III) salt into gold nanoparticles on the LNT surfaces is used to obtain hybrid structures.…”

Section: Introductionmentioning

confidence: 99%

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Smart Lipid Nanotubes for Easy Formation of Gold‐Lipid Hybrid Nanotubes and Tunable Gold Superstructures

et al. 2019

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Organic‐inorganic hybrid nanotubes are highly functional and interesting materials. However, their formation generally requires reducing agents, high temperatures, special procedures, organic solvents etc. Here, using a simple concept based on engineering and materials design, we fabricated stimuli‐responsive lipid‐gold hybrid nanotubes. Self‐assembled lipid nanotubes, made from specially designed AQua molecules, are used as the nucleation sites. Well‐coated hybrid nanotubes are obtained by the in‐situ formation of gold nanoparticles on the nanotubes. The AQua molecule itself, without any other additives, reduces and stabilizes the gold nanoparticles. The nanoparticle coating degrees on the lipid nanotubes can be adjusted by varying the temperature, pH, and/or HAuCl4 concentration. In addition to hybrid nanotubes, stimuli‐responsive gold nano‐(wires, pompoms, and cubes) and polyhedrons are formed at specific conditions. Varying the pH results in a reversible change of gold nanowires to polyhedrons.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Smart Lipid Nanotubes for Easy Formation of Gold‐Lipid Hybrid Nanotubes and Tunable Gold Superstructures

et al. 2019

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“…We calculated surface charge density values which are dependent on the zetapotential value, composition, geometry and size of the SLNs. This calculation was performed using the previously reported equations and assuming that the particles are spherical [52,53] (the equations used for this calculation are given in Supplementary Material). Table 1, reveals that when the particle size increases, the surface charge increases relative to it, too.…”

Section: Preparation and Characterization Of The Slnsmentioning

confidence: 99%

Preparation and investigation of solid lipid nanoparticles for drug delivery

Kalaycioglu

Aydoğan

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…AQUA forms self-assembled lipid nanotubes in water in the presence of equimolar amount of ethanolamine (at the AQUA concentration of 1 wt %) (Figure 1b). 39 The AQUA molecule contains two functional groups: redox-active aminoanthraquinone and pH-sensitive carboxylic acid group, which are linked by an alkyl chain. This rational molecular design gives a dual stimuli-responsive character to AQUA.…”

Section: ■ Introductionmentioning

confidence: 99%

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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Formation of chiral nanotubes by the novel anthraquinone containing-achiral molecule

Cited by 12 publications

References 55 publications

Smart Lipid Nanotubes for Easy Formation of Gold‐Lipid Hybrid Nanotubes and Tunable Gold Superstructures

Smart Lipid Nanotubes for Easy Formation of Gold‐Lipid Hybrid Nanotubes and Tunable Gold Superstructures

Preparation and investigation of solid lipid nanoparticles for drug delivery

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

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