Photo-Isomerization Energy Storage Using Azobenzene and Nanoscale Templates: A Topical Review

Li, Shuwei; Wang, Hongqiang; Fang, Juan; Liu, Qibin; Wang, Jiangjiang; Guo, Shu-Guang

doi:10.1007/s11630-020-1245-y

Cited by 14 publications

(13 citation statements)

References 107 publications

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“…For instance, azobenzene and its derivatives are typical representatives with photo-induced EZI effect. When EZI occurs in mesoscopic materials, changes in various chemical and physical properties are accompanied, such as photochromism, photo-induced expansion/contraction effects, etc [74] . TPE-based AIEgens also contain different numbers of double bond which are verified to play important roles in the fluorescent quenching in the solution.…”

Section: Structural Characterizationmentioning

confidence: 99%

Restriction of Intramolecular Motion(RIM): Investigating AIE Mechanism from Experimental and Theoretical Studies

Zhang

Lam

et al. 2021

Chem. Res. Chin. Univ.

118

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Mechanistic studies promote scientific development from phenomena to theories. Aggregation-induced emission (AIE), as an unusual photophysical phenomenon, builds the bridge between molecular science and aggregate mesoscience. With the twenty-year development of AIE, restriction of intramolecular motion (RIM) has been verified as the working mechanism of AIE effect. In this review, these mechanistic works about RIM are summarized from experimental and theoretical perspectives. Thereinto, the experimental studies are introduced from three parts: external rigidification, structural modification and structural characterization. In the theoretical part, calculations on the lowfrequency motion of AIEgens have been performed to prove the RIM mechanism. By virtue of the theoretical calculations, some new mechanisms are proposed to supplement the RIM, such as restriction of access to conical intersection, suppression of Kasha transition, restriction of access to dark state, etc. It is foreseeable that the RIM mechanism will unify the photophysical theories for both molecules and aggregates, and inspire more progress in aggregate science.

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Section: Structural Characterizationmentioning

confidence: 99%

Restriction of Intramolecular Motion(RIM): Investigating AIE Mechanism from Experimental and Theoretical Studies

Zhang

Lam

et al. 2021

Chem. Res. Chin. Univ.

118

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“…This method offers the possibility to release the PC enthalpy and photo‐thermal (PT) energy of PCMs simultaneously. [ 8 ] Among several photosensitive molecules, [ 9 ] azobenzene derivatives have been extensively explored and have been considered as ideal photochromic candidates for molecular regulation of structural transformation [ 10 ] owning to their reversible isomerization from the metastable cis ( Z )‐isomer to the stable trans ( E )‐isomer under UV and visible light illumination, [ 11 ] which has been widely used for light‐induced thermal energy storage, [ 12 ] as well as having potential applications in data storage [ 13 ] and transmistor devices of fully photon operated logic circuits. [ 14 ] Therefore, when azobenzene molecules are introduced into organic PCMs, the effectiveness of the control over the heat release and the stability of heat storage at different temperatures is determined by the isomerization (degree and speed) of azobenzene.…”

Section: Introductionmentioning

confidence: 99%

Optically Triggered Synchronous Heat Release of Phase‐Change Enthalpy and Photo‐Thermal Energy in Phase‐Change Materials at Low Temperatures

Líu

Tang

Dong

et al. 2020

Adv Funct Materials

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Phase‐change materials (PCMs) are used in several energy recycling utilization systems due to their latent‐heat‐storage and ‐release ability. However, the inability of PCMs to release heat at temperatures below their freezing point limits their application in distributed energy utilization systems. This paper reports optically‐triggered low‐temperature heat release in PCMs based on a solid–liquid phase change (PC) controlled by the trans–cis (E–Z) photo‐isomerization of azobenzene. To achieve this, a photo‐responsive alkyl‐grafted Azo is incorporated into tetradecane (Ted) to create a photo‐sensitive energy barrier for the PC. The Azo/Ted composite exhibits controllable supercooling (4.04–8.80 °C) for heat storage and achieves synchronous heat release of PC enthalpy and photo‐thermal energy. In addition, the Azo reduces the crystallization of Ted by intercalating into its molecular alignment. Furthermore, under light illumination, the Azo/Ted composite releases considerable heat (207.5 J g−1) at relatively low temperatures (−1.96 to −6.71 °C). The temperature of the annular device fabricated for energy utilization increases by 4 °C in a low‐temperature environment (−5 °C). This study will pave the way for the design of advanced distributed energy systems that operate by controlling the energy storage/release of PCMs over a wide range of temperatures.

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“…[1][2][3][4][5][6] Among them, azobenzene-based materials, due to their unique photo-responsive features, have attracted great attention for the remote and flexible control of materials properties via light stimulation. [7,8] The light response is triggered by photoisomerization of the azobenzene units using UV or visible irradiation, [9] providing the basis for a variety of photonic applications such as energy storage, [10,11] holographic recording, [12][13][14] soft robotics, [15,16] dynamic control of surface topology in liquid crystalline elastomers [17] and nonlinear optics [18,19] where, in particular, photoinduced reorientation allows for all-optical poling. [20] As one striking example, by controlling the impinging light configuration, the photoinduced processes in azobenzene-containing thin films invoke material mass migration that leads to the formation of topographic surface patterns, a prominent example being surface-relief grating (SRG) formation upon irradiation with a light interference pattern.…”

mentioning

confidence: 99%

Surface Stability of Azobenzene‐Based Thin Films in Aqueous Environment: Light‐Controllable Underwater Blistering

Audia

Fedele

Tone

et al. 2022

Adv Materials Inter

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potential in applications such as additive manufacturing, civil engineering, and biomedicine. [1][2][3][4][5][6] Among them, azobenzene-based materials, due to their unique photo-responsive features, have attracted great attention for the remote and flexible control of materials properties via light stimulation. [7,8] The light response is triggered by photoisomerization of the azobenzene units using UV or visible irradiation, [9] providing the basis for a variety of photonic applications such as energy storage, [10,11] holographic recording, [12][13][14] soft robotics, [15,16] dynamic control of surface topology in liquid crystalline elastomers [17] and nonlinear optics [18,19] where, in particular, photoinduced reorientation allows for all-optical poling. [20] As one striking example, by controlling the impinging light configuration, the photoinduced processes in azobenzene-containing thin films invoke material mass migration that leads to the formation of topographic surface patterns, a prominent example being surface-relief grating (SRG) formation upon irradiation with a light interference pattern. [21][22][23][24] SRGs show great promise as diffractive photonic elements, [25,26] biosensing substrates, [27] or as nano-/microfabrication templates. [28][29][30] The micron-scale periodicity of SRGs renders them an excellent fit for biological systems, many of which are composed of cells that are extremely sensitive to mechanical and topographic features of the surrounding microenvironment. [31,32] Hence, there is a growing interest in the use of azobenzene-based materials as smart bio-interfaces for cell culture. [33][34][35] The native extracellular matrix (ECM) of soft tissue is composed of entangled fibrous proteins, [36,37] as reproduced also in many synthetic ECM products. [38] Furthermore, ECM is continuously remodeled by the cells in physiological and pathological conditions. [39] Sinusoidal SRGs and embossed pillars in azobenzene thin films have been used for mimicking the ECM texture and controlling cellular directional migration in single and multiple cells, [40][41][42] directing axonal extension, [43,44] and determining stem cell fate. [45] The most exciting characteristic provided by azobenzenebased systems lies in the reversibility of the photoinduced processes. It is well known that SRGs recorded in thin films can be erased by heating the sample above the glass transition temperature (T g ). [46,47] SRGs can be also efficiently erased and re-inscribed optically by using single-beam irradiation [24,48,49] or Azobenzene-based light-responsive thin films are emerging as appealing candidates for smart cell-culture substrates. Their attraction lies in the fact that they can be reversibly photo-patterned, providing a route for dynamically mimicking the remodeling of the extracellular matrix. However, since the cells need to be cultured in aqueous environment, a key parameter in the layout of any biological application is the stability of the surface underwater. In this work, the authors perform a detail...

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Photo-Isomerization Energy Storage Using Azobenzene and Nanoscale Templates: A Topical Review

Cited by 14 publications

References 107 publications

Restriction of Intramolecular Motion(RIM): Investigating AIE Mechanism from Experimental and Theoretical Studies

Restriction of Intramolecular Motion(RIM): Investigating AIE Mechanism from Experimental and Theoretical Studies

Optically Triggered Synchronous Heat Release of Phase‐Change Enthalpy and Photo‐Thermal Energy in Phase‐Change Materials at Low Temperatures

Surface Stability of Azobenzene‐Based Thin Films in Aqueous Environment: Light‐Controllable Underwater Blistering

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