Polar-axis-deformation induced molecular pyroelectrics for waste heat harvesting

用于废热收集的极轴变形诱导分子热释电

• 批准号: 22K14655
• 负责人: 黄 瑞康
• 金额: $ 3万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K14655/
• 关键词: supramolecule; polarity; structural flexibility; pyroelectricity; Molecular pyroelectrics; Waste heat harvesting; Thermal expansion; Supramolecular crystals

18-crown-6-based supramolecular crystals can exhibit structural flexibility or polarity. For example, nitromethane solvate 18C6 is highly structurally flexible due to Van der Waal interactions between nitromethane and 18C6. Additionally, (4-methoxyanilinium)(18C6)(BF4) shows polarity due to the polar -OCH3 group, allowing the crystal to exhibit piezoelectricity, pyroelectricity, and ferroelectricity. Combining polarity and structural flexibility in an 18C6 crystal is achievable using polar ammoniums with an increased number of -CH2 groups.Our preliminary study found that that the combination of 3-hydroxyl-adamantane-1-aminium (HADA-OH) with 18C6 produced a crystal that was both structurally flexible and polar due to the -OH group. The polar (HADA-OH)(18C6)ClO4 crystal was found to exhibit both the highest structural flexibility among organic salts and large pyroelectricity (20 times that of PVDF).This study focuses on HADA-R derivatives (R = H, F, Cl, Br) and examines the effects of different -R groups and counter anions on crystal packing, flexibility, and pyroelectricity. The goal is to establish a relationship between design, structure, and performance in this system and propose a novel strategy for high-performance pyroelectrics for waste heat harvesting.

18-冠-6超分子晶体可以表现出结构的柔性或极性。例如，由于硝基甲烷和18C6之间的Van der Waal相互作用，硝基甲烷溶剂18C6在结构上是高度灵活的。此外，(4-甲氧基苯胺)(18C6)(BF4)(BF4)由于OCH3基团而显示出极性，使晶体表现出压电性、热释电性和铁电性。在18C6晶体中，通过增加-CH2基团的极性氨可以实现极性和结构灵活性的结合。我们的初步研究发现，3-羟基金刚烷-1-胺(HADA-OH)与18C6的结合产生了结构柔性和极性的晶体，这是由于-OH基团的缘故。极性(Hada-OH)(18C6)ClO4晶体在有机盐中表现出最高的结构柔性和较大的热释电(是PVDF的20倍)。本研究以HADA-R衍生物(R=H，F，Cl，Br.)为研究对象，考察了不同的-R基团和反阴离子对晶体堆积、柔韧性和热释电的影响。其目的是建立该系统的设计、结构和性能之间的关系，并提出一种用于废热收集的高性能热释电材料的新策略。

项目成果

Solvent dependence of crystal structure and dielectric relaxation in ferromagnetic [MnCr(oxalate)3]- salt

铁磁 [MnCr(草酸)3]-盐中晶体结构和介电弛豫的溶剂依赖性

• DOI: 10.1039/d2dt01615j
• 发表时间: 2022
• 期刊: Dalton Transactions
• 影响因子: 4
• 作者: Wu Jia-bing;Huang Rui-Kang;Takahashi Kiyonori;Nakamura Takayoshi
• 通讯作者: Nakamura Takayoshi

A Proton Conductive Porous Framework of an 18-Crown-6-Ether Derivative Networked by Rigid Hydrogen Bonding Modules

由刚性氢键模块网络化的 18-冠-6-醚衍生物的质子传导多孔框架

• DOI: 10.1002/anie.202211686
• 发表时间: 2022
• 期刊: Angew. Chem. Int. Ed.
• 作者: Xin Chen;Rui-Kang Huang;Kiyonori Takahashi;Shin-ichiro Noro;Takayoshi Nakamura;Ichiro Hisaki
• 通讯作者: Ichiro Hisaki

Multifunctional Triggering by Solid-Phase Molecular Motion: Relaxor Ferroelectricity, Modulation of Magnetic Exchange Interactions, and Enhancement of Negative Thermal Expansion

固相分子运动的多功能触发：弛豫铁电性、磁交换相互作用的调制以及负热膨胀的增强

• DOI: 10.1021/acs.chemmater.2c03552
• 发表时间: 2023
• 期刊: Chemistry of Materials
• 影响因子: 8.6
• 作者: Li;Simin; Takahashi;Kiyonori; Huang;Rui-Kang; Xue;Chen; Kokado;Kenta; Hoshino;Norihisa; Akutagawa;Tomoyuki; Nishihara;Sadafumi; Nakamura;Takayoshi
• 通讯作者: Takayoshi

Towards molecular multiferroics by supramolecular rotor and [MnCr(oxalate)3]－ salts

超分子转子和[MnCr(草酸)3]－盐的分子多铁性

• 发表时间: 2022
• 作者: Rui-Kang Huang;Jia-bing Wu; Kiyonori Takahashi;Takayoshi Nakamura
• 通讯作者: Takayoshi Nakamura