Directional, Low-Energy Driven Thermal Actuating Bilayer Enabled by Coordinated Submolecular Switching.
Directional, Low-Energy Driven Thermal Actuating Bilayer Enabled by Coordinated Submolecular Switching.
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DOI：
10.1002/advs.202102077
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发表时间：
2021-12
期刊：
影响因子：
--
通讯作者：
Lu JQ
中科院分区：
文献类型：
--
作者：
Leveille M;Shen X;Fu W;Jin K;Acerce M;Wang C;Bustamante J;Casas AM;Feng Y;Ge NH;Hirst LS;Ghosh S;Lu JQ
作者揭示了一种热驱动双层膜，它在低能量的热刺激下发生可逆变形，例如，温度升高几度。它是由排列的碳纳米管片共价连接到聚合物层制成的，在聚合物层中，二苯并环八-1，5-二烯(DBCOD)驱动单元平行于碳纳米管取向。在低能量热刺激下，DBCOD的亚分子水平构象发生协调变化，导致宏观热收缩。这种独特的热收缩提供了明显的优势。它本质上是快速的、可重复的、低能耗驱动的，并且与介质无关。共价界面和构象变化的可逆性赋予了这种双层膜极好的重复性，至少可达70,000次循环。与传统的碳纳米管双层系统不同，该系统可以很容易地实现高精度的驱动，并且可以缩小到纳米级。一种由聚偏氟乙烯(PVDF)与双层膜串联而成的新平台可以收集低品位热能并将其转化为电能。该平台暴露在室温以上6摄氏度的热波动中，产生的能量是单独使用PVDF的86倍。该平台提供了一条获取低级热能的途径。它还支持低能量驱动的热模拟机器人、超灵敏的热传感器和远程控制的近红外(NIR)驱动的执行器。一种双层膜，其中致动的亚分子单元排列，在低能量刺激下经历可逆的和可控的形状变化。它本质上是可逆的，作用于源于亚分子构象变化的聚合物热收缩。与压电薄膜相结合，双层薄膜对温度变化的超敏性被用于低级热能收集。
The authors reveal a thermal actuating bilayer that undergoes reversible deformation in response to low‐energy thermal stimuli, for example, a few degrees of temperature increase. It is made of an aligned carbon nanotube (CNT) sheet covalently connected to a polymer layer in which dibenzocycloocta‐1,5‐diene (DBCOD) actuating units are oriented parallel to CNTs. Upon exposure to low‐energy thermal stimulation, coordinated submolecular‐level conformational changes of DBCODs result in macroscopic thermal contraction. This unique thermal contraction offers distinct advantages. It's inherently fast, repeatable, low‐energy driven, and medium independent. The covalent interface and reversible nature of the conformational change bestow this bilayer with excellent repeatability, up to at least 70 000 cycles. Unlike conventional CNT bilayer systems, this system can achieve high precision actuation readily and can be scaled down to nanoscale. A new platform made of poly(vinylidene fluoride) (PVDF) in tandem with the bilayer can harvest low‐grade thermal energy and convert it into electricity. The platform produces 86 times greater energy than PVDF alone upon exposure to 6 °C thermal fluctuations above room temperature. This platform provides a pathway to low‐grade thermal energy harvesting. It also enables low‐energy driven thermal artificial robotics, ultrasensitive thermal sensors, and remote controlled near infrared (NIR) driven actuators. A bilayer in which actuating submolecular units are aligned undergoes reversible and controlled shape changes in response to low‐energy stimuli. It is inherently reversible, operating on polymer thermal contraction originating from a submolecular conformational change. Combined with a piezoelectric film, the bilayer's ultra‐sensitivity to temperature variations is exploited for low‐grade thermal energy harvesting.
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影响因子：
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作者：
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通讯作者：
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作者：
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DOI：
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发表时间：
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影响因子：
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影响因子：
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作者：
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