Light-Driven Reversible Handedness Inversion in Self-Organized Helical Superstructures

Mathews, Manoj; Zola, Rafael S.; Hurley, Shawn; Yang, Deng‐Ke; White, Timothy J.; Bunning, Timothy J.; Li, Quan

doi:10.1021/ja108437n

Cited by 167 publications

(110 citation statements)

References 52 publications

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“…Some binaphthyl-derived azobenzene compounds 21-24 (Fig. 5.16) following this principle have been reported [77][78][79][80].…”

Section: Handedness Inversion In Azobenzene-doped Clcs In 2002 Ruslimentioning

confidence: 94%

“…For example, Li et al recently reported a fast photon mode reversible handedness inversion of a self-organized helical superstructure, that is, the cholesteric LC phase, using chiral cyclic azobenzene compound (R)-22 and (R)-23 [80]. These two compounds show photochemically reversible trans to cis isomerization in solution without undergoing thermal or photo-induced racemization.…”

Section: Handedness Inversion In Azobenzene-doped Clcs In 2002 Ruslimentioning

confidence: 99%

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Photoresponsive Cholesteric Liquid Crystals

Li¹,

Li²

2013

Intelligent Stimuli‐Responsive Materials

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“…Some binaphthyl-derived azobenzene compounds 21-24 (Fig. 5.16) following this principle have been reported [77][78][79][80].…”

Section: Handedness Inversion In Azobenzene-doped Clcs In 2002 Ruslimentioning

confidence: 94%

Section: Handedness Inversion In Azobenzene-doped Clcs In 2002 Ruslimentioning

confidence: 99%

Photoresponsive Cholesteric Liquid Crystals

Li¹,

Li²

2013

Intelligent Stimuli‐Responsive Materials

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“…In the past decade, a number of light responsive chiral dopants which can change their HTP either upon isomerization or helical inversion have been used to tune the position of a cholesteric reflection notch over a wide range. [116][117][118] A light responsive system which can change its reflection bandwidth based on the intensities of light would be very attractive. First steps for such a responsive system in the visible and infrared regions have been taken by White et al using a chiral azobenzene photoisomer doped in a Ch-LC cell.…”

Section: Outlook and Future Challengesmentioning

confidence: 99%

Infrared Regulating Smart Window Based on Organic Materials

Khandelwal

Schenning

Debije

2017

Advanced Energy Materials

324

220

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(IR), here defined as light with wavelengths between 700 nm and 2500 nm, accounts for around 50% of the total energy emitted by the sun reaching Earth (Figure 1b), [3,4] and this light produces interior heating but is invisible to the unaided eye.The absorption of sunlight by building materials and passage of IR through transparent surfaces such as windows is responsible for much of the interior overheating of office rooms, automobile interiors, greenhouses, and other similar spaces. The use of artificial cooling and heating systems will only increase with the continued influence of global climate change, with energy used for cooling systems surpassing energy used for heating around the year 2070, and a 40 fold increase in air cooling energy use is expected by 2100. [5] By controlling the influx of radiant heat transfer, calculations show that more than 50% of the energy used in lighting, heating and cooling could be saved by deploying better control systems over only 18% of available window stock. [6] In areas with human inhabitants employing windows, more aspects must be considered than simply reducing the use of energy in the room: any switchable window used in, for example, a commercial office space has several other requirements that must be met before it may be installed. Among these requirement are reasonably fast switching speeds [7] (although for IR control, relatively longer times compared to visible light switching should be acceptable), good optical transparency with minimum haze, an acceptable device lifetime, [8] and functionality over a range of exterior temperatures. Controlling the excess of solar energy without compromising the visible transparency of the window is an important consideration for human health: maintaining inside/outside contact and daylighting are vital in retaining well-being and productivity, as well as providing economic and aesthetic gain by reducing the need for artificial lighting systems. [9,10] These are challenging goals for a window to realize.A number of materials have been developed over the past few decades to maintain indoor temperatures. Many of these focus on the opaque structural building elements like walls and roofing. [10][11][12][13] Other solutions target the transparent window, employing external mechanical shutters and blinds, [14] phase change materials (PCMs), [15] thermochromic materials, [16] aerogels, [17] trapped gas in fluid membranes, [18] and even phononic materials, [19] among other options. Indeed, controlling heat passage through the window in response to changing climate conditions is a great challenge; ideally, one would accomplish Windows are vital elements in the built environment that have a large impact on the energy consumption in indoor spaces, affecting heating and cooling and artificial lighting requirements. Moreover, they play an important role in sustaining human health and well-being. In this review, we discuss the next generation of smart windows based on organic materials which can change their properties by reflecting or trans...

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“…The optical properties of the entire H-PDLC structure can be effectively altered when one externally changes the orientation of LC molecules inside the droplets. 8,9 In this regard, electrical and optical [10][11][12][13][14][15][16][17][18][19] approaches have been extensively exploited to reorient the LC molecules. However, these two manipulation methods have their respective limitations.…”

Section: Introductionmentioning

confidence: 99%