Use of Photoacids and Photobases To Control Dynamic Self-Assembly of Gold Nanoparticles in Aqueous and Nonaqueous Solutions

Yucknovsky, Anna; Mondal, Somen; Burnstine‐Townley, Alex; Foqara, Mohammad; Amdursky, Nadav

doi:10.1021/acs.nanolett.9b00952

Cited by 49 publications

(43 citation statements)

References 39 publications

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“…In this section, we designed a complex droplet with compartmentalization, in which an aqueous photoacid solution was encapsulated inside the oil layer. To do so, we have created a droplet from didecyldimethylammonium bromide (DDAB) in nitrobenzene (containing the oil red dye), to which an aqueous phase was injected containing the 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS) photoacid with pKa values of 7.4 and 0.4 in its ground and excited state, respectively 33 (Figure S1d). The working principle here (Figure 5a) is that upon exciting the HPTS at 405 nm, it will undergo proton dissociation, which in turn will change the ionic strength of the aqueous phase, thus affecting the ST between the aqueous and organic layers, leading eventually to the self-propulsion of the droplet.…”

Section: Water/oil/water System Containing An Inner Photoacid Phasementioning

confidence: 99%

Self-Propulsion of Droplets via Light-Stimuli Rapid Control of Their Surface Tension

Yucknovsky¹,

Rich²,

Westfried³

et al. 2021

Preprint

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Biology demonstrates many examples of response and adaptation to external stimuli, and here we focus on self-propulsion (motion) while presenting several self-propelling droplet systems responsive to pH gradients. We use light as the gating source to gain reversibility, avoid the formation of chemical wastes, and control the self-propulsion remotely. To achieve light-stimuli ultra-fast response, we use photoacids and photobases, capable of donating or capturing a proton, respectively, in their excited-state. We control the movement and directionality of the droplet’s self-propulsion by introducing the photo-acid/base either in bulk solution, on the surface of the droplet, or inside the droplet. We show that proton transfer between the photo-acid/base and the droplet results in a rapid change in the droplet’s surface tension, which induces the self?propulsion movement. The high versatility of our systems together with a record-breaking ultra?fast response to light makes them highly attractive for the design of various controlled cargo?carrier systems.<br>

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Section: Water/oil/water System Containing An Inner Photoacid Phasementioning

confidence: 99%

Self-Propulsion of Droplets via Light-Stimuli Rapid Control of Their Surface Tension

Yucknovsky¹,

Rich²,

Westfried³

et al. 2021

Preprint

Self Cite

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“…For example, the thermal half‐life of the light‐induced deprotonated state ( 4 + H + ) could be as long as 70 s . To address this issue and to combine rapid assembly with rapid disassembly, Amdursky and co‐workers developed a clever system based on the simultaneous use of a photoacid and a photobase . For the photoacid, they used a sulfonated hydroxypyrene, which undergoes deprotonation under blue (405 nm) light.…”

Section: (De)protonation Of Nanoparticle‐bound Ligands Using Photoacimentioning

confidence: 99%

“…When gold NPs (3.8 nm) functionalized with 6‐mercaptohexanoic acid were placed in an aqueous solution of this mixture, they could be assembled and disassembled with rates (an initial fast component of double exponential fitting) of only 0.3 and 0.4 s, respectively, for many cycles. In a nonaqueous solution (methanol), the same NPs could be reversibly assembled with malachite green as the photobase …”

Section: (De)protonation Of Nanoparticle‐bound Ligands Using Photoacimentioning

confidence: 99%

The Many Ways to Assemble Nanoparticles Using Light

2019

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The ability to reversibly assemble nanoparticles using light is both fundamentally interesting and important for applications ranging from reversible data storage to controlled drug delivery. Here, the diverse approaches that have so far been developed to control the self-assembly of nanoparticles using light are reviewed and compared. These approaches include functionalizing nanoparticles with monolayers of photoresponsive molecules, placing them in photoresponsive media capable of reversibly protonating the particles under light, and decorating plasmonic nanoparticles with thermoresponsive polymers, to name just a few. The applicability of these methods to larger, micrometer-sized particles is also discussed. Finally, several perspectives on further developments in the field are offered.

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“…Another class of photobases is an Arrhenius type, resulting in a hydroxide release following light absorption, which was recently used to manipulate ionic properties. [20] However, the reversibility of the latter class is poor and the return of the hydroxide in the ground state is very slow with very poor efficiency, [23] which is in contrast to Brønsted-Lowry photo-acids/bases. A far throw from common ionic conductive materials, nature also uses the controlled movement of ions in numerous fundamental biochemical processes.…”

Section: Introductionmentioning

confidence: 99%

Light-Modulated Cationic and Anionic Transport Across Protein Biopolymers

Burnstine‐Townley¹,

Mondal²,

Agam³

et al. 2021

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Light is a convenient source of energy and the heart of light-harvesting natural systems and devices. Here, we show light-modulation of both the chemical nature and ionic charge carrier concentration within a protein-based biopolymer that was covalently functionalized with photoacids or photobases. Using steady-state and time-resolved fluorescence, we explore the capability of the biopolymer-tethered photoacids and photobases to undergo excited-state proton transfer and capture (ESPT and ESPC), respectively. Various electrical measurements show that both the photoacid- and photobase-functionalized biopolymers exhibit an impressive increase in ionic conductivity upon light irradiation, which can be modulated by the light intensity. Whereas ESPT-induced cationic protons are the charge carriers for the photoacid-functionalized biopolymer, ESPC-induced water-derived anionic hydroxides are the suggested charge carriers for the photobase-functionalized biopolymer. Our work introduces a versatile toolbox to light?modulate charge carriers in polymers and taking together the attractive environmental nature of our new light-modulated ionic-conductive biopolymers, they can be considered for various photoelectrochemical applications. <br>

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Use of Photoacids and Photobases To Control Dynamic Self-Assembly of Gold Nanoparticles in Aqueous and Nonaqueous Solutions

Cited by 49 publications

References 39 publications

Self-Propulsion of Droplets via Light-Stimuli Rapid Control of Their Surface Tension

Self-Propulsion of Droplets via Light-Stimuli Rapid Control of Their Surface Tension

The Many Ways to Assemble Nanoparticles Using Light

Light-Modulated Cationic and Anionic Transport Across Protein Biopolymers

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