Targeted Activation of Molecular Transportation by Visible Light

Amrutha, Ammathnadu S.; Kumar, K. R. Sunil; Kikukawa, Takashi; Tamaoki, Nobuyuki

doi:10.1021/acsnano.7b06059

Cited by 28 publications

(15 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Vis-light irradiation causes the fast isomerization of trans DR1 to cis one; once Vis light is removed, cis DR1 will be transformed to trans isomers rapidly. Therefore, it is difficult to monitor the cis isomers due to the fact that the isomerization rate of push-pull azobenzene exceeds the acquisition speed of the spectrophotometer [46]. This is confirmed by the UV-Vis spectra of both the DR1-containing precursor and DR1-functionalized MS (Figs S6 and S7).…”

Section: Science China Materialsmentioning

confidence: 89%

“…The removal of Vis light leads to rapid recovery of trans configuration (within milliseconds). It is thus difficult to detect such a change by the UV-Vis spectrophotometer because the speed of isomerization is faster than that of data acquisition for the instrument [46]. The mechanism on the photoresponsive regulation of adsorption capacity in the present system was then examined.…”

Section: Proposed Mechanism For Tunable Adsorption Behaviormentioning

confidence: 99%

See 1 more Smart Citation

Smart adsorbents for CO2 capture: Making strong adsorption sites respond to visible light

Tan

et al. 2020

Sci. China Mater.

View full text Add to dashboard Cite

Due to the good controllability and high energy efficiency in adsorption processes, photoresponsive adsorbents are intriguing for CO 2 capture. Nevertheless, most reported photoresponsive adsorbents are designed based on weak adsorption sites, regulating CO 2 adsorption through structural change or steric hindrance. In addition, ultraviolet (UV) light is commonly involved in the regulation of adsorption capacity. Here we report for the first time the smart adsorbents for CO 2 capture, which makes strong adsorption sites respond to visible (Vis) light. The adsorbents were fabricated by introducing primary amine and Dispersed Red 1 (DR1, a kind of push-pull azobenzene that responds to Vis light rapidly) units to mesoporous silica, which act as strong adsorption sites and triggers, respectively. The primary amine sites make the adsorbents highly selective in the adsorption of CO 2 over CH 4. Without light irradiation, azobenzene is in the form of trans configuration, which leads to decreased electrostatic potential of primary amines and subsequently, exposure of active sites and liberal adsorption of CO 2. Upon Vislight irradiation, cis isomers are formed, which results in increased electrostatic potential of primary amines and subsequently shelter of active sites. Even on such strong adsorption sites, the alteration of CO 2 adsorption capacity can reach 40% for the adsorbent with and without Vis-light irradiation. Moreover, the trans/cis isomerization of DR1 units can be triggered reversibly by Vis light. The present smart system endows adsorbents with selective adsorption capacity and avoids the employment of UV light, which is unlikely to be achieved by conventional photoresponsive adsorbents.

show abstract

Section: Science China Materialsmentioning

confidence: 89%

Section: Proposed Mechanism For Tunable Adsorption Behaviormentioning

confidence: 99%

Smart adsorbents for CO2 capture: Making strong adsorption sites respond to visible light

Tan

et al. 2020

Sci. China Mater.

View full text Add to dashboard Cite

show abstract

“…Upon light activation, some photoswitchable molecules remain in their metastable state (maintaining the assembled state) for a long time; however, others back-isomerize as soon as irradiation is discontinued. For azobenzenes alone, the lifetime of the metastable state can be tuned between submilliseconds 63 and years 64 solely by changing the substitution pattern on the azobenzene core. ll Chem 7, 23-37, January 14, 2021…”

Section: Efficiency Of Generating the Activated Statementioning

confidence: 99%

Dissipative Self-Assembly: Fueling with Chemicals versus Light

Weißenfels

Gemen

Klajn

2021

Chem

168

131

View full text Add to dashboard Cite

“…One way to redirect microtubules locally is to change the local environment around microtubules. Tamaoki and coworkers (Amrutha, Kumar, Kikukawa, & Tamaoki, ; Kumar, Amrutha, & Tamaoki, ) designed light‐controlled microtubule transport mechanisms by introducing azobenzene‐derived nonnucleoside triphosphate as the substitute for ATP and azobenzene‐tethered peptide as kinesin inhibitor. Shining UV or visible light can switch photoisomerizable azobenzene between cis and trans forms to either trigger or block the microtubule gliding, respectively.…”

Section: Introductionmentioning

confidence: 99%

Local direction change of surface gliding microtubules

Pan

Choi

2019

Biotech & Bioengineering

View full text Add to dashboard Cite

In vitro gliding assay, microtubule translocation by kinesin motor proteins on a surface, has been used as an engineering tool in analyte detection, molecular cargo transport, and other applications. Although controlling the moving direction is often necessary to realize these applications, current direction control methods focus largely on lithographic microfabrication of tracks or external fields on the microtubules. These methods are effective, but are relatively complicated. In addition, they cannot target particular microtubules without affecting others. In this study, we propose a facile approach that can make local direction changes for selected microtubules using a polystyrene particle as a circular motion center and a DNA double helix with streptavidin as a capture arm. The DNA arm captures a microtubule in the close proximity of the immobilized particle via biotin–streptavidin interaction and changes the moving direction ~10° on average. In contrast, no significant direction changes are observed other than random variations with streptavidin‐less DNA arms (normal distribution centered at 0°), similar to regular motility assay. The particle‐assisted local direction change scheme is compared with a flow field‐based ensemble method. The combination of flow and kinesin interactions with each microtubule exerts a force to change the direction, ultimately aligning it to the flow field, regardless of its initial direction. A simple model based on the force balance predicts the time needed for such an alignment. Overall, the particle‐based local scheme is distinct and different from ensemble methods such as crossflow that changes directions of all microtubules in the field, thus offering unique utility in engineering applications.

show abstract

Targeted Activation of Molecular Transportation by Visible Light

Cited by 28 publications

References 39 publications

Smart adsorbents for CO2 capture: Making strong adsorption sites respond to visible light

Smart adsorbents for CO2 capture: Making strong adsorption sites respond to visible light

Dissipative Self-Assembly: Fueling with Chemicals versus Light

Local direction change of surface gliding microtubules

Contact Info

Product

Resources

About