Rheological and rheodielectric hole burning spectroscopy for the investigation of supramolecular relaxation processes in small-molecule glass formers

用于研究小分子玻璃形成体中的超分子弛豫过程的流变学和流变介电烧孔光谱

• 批准号: 319140174
• 负责人: Professor Dr. Roland Böhmer
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik III
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/319140174?language=en
• 关键词: Rheological; rheodielectric; hole; burning; spectroscopy

To gain detailed insights into the complex interplay of motional processes in ring- and chain-forming hydrogen-bonded associates, the present project aims at destabilizing the supramolecular structure of suitable viscous liquids by subjecting them to large external shear fields. Also including Fourier methods, this calls for an adaptation and refinement of experimental protocols that are well established in the framework of nonresonant dielectric hole burning spectroscopy and transferrable to the field of nonlinear rheology. The quantitative description of measurements achievable using the mechanical techniques will require to adjust theoretical approaches that are known to allow for a faithful modeling of corresponding dielectric experiments. The major goal of these activities is to unravel the supramolecular mechanisms active in Debye-type liquids such as monohydroxy alcohols, secondary amides, and aqueous solutions. In particular, this involves the exploration of the so far largely uncharted mutual coupling of electrical and mechanical degrees of freedom in these fluids by means of combination experiments like rheodielectric spectroscopy and infrared absorption in frequency dependent shear fields.

为了详细了解形成环和链的氢键缔合物中运动过程的复杂相互作用，本项目旨在通过将合适的粘性液体置于大的外部剪切场中来破坏其超分子结构的稳定性。还包括傅里叶方法，这需要对实验方案进行调整和完善，这些实验方案在非共振介电烧孔光谱框架中已经建立，并且可以转移到非线性流变学领域。使用机械技术可实现的测量的定量描述将需要调整已知的理论方法，以允许对相应的介电实验进行忠实的建模。这些活动的主要目标是揭示德拜型液体（例如一羟基醇、仲酰胺和水溶液）中活跃的超分子机制。特别是，这涉及通过流变介电光谱和频率相关剪切场中的红外吸收等组合实验来探索这些流体中迄今为止很大程度上未知的电气和机械自由度的相互耦合。

项目成果

Nonlinear electrical and rheological spectroscopies identify structural and supramolecular relaxations in a model peptide.

非线性电学和流变光谱可识别模型肽中的结构和超分子弛豫。

• DOI: 10.1039/c9sm00434c
• 发表时间: 2019-05-29
• 期刊: Soft matter
• 影响因子: 3.4
• 作者: Gabriel Honorio;S. Bierwirth;C. Gainaru;R. Böhmer
• 通讯作者: R. Böhmer

First-Order and Third-Order Nonlinearities from Medium-Amplitude Oscillatory Shearing of Hydrogen-Bonded Polymers and Other Viscoelastic Materials

氢键聚合物和其他粘弹性材料的中振幅振荡剪切的一阶和三阶非线性

• DOI: 10.1021/acs.macromol.9b01650
• 发表时间: 2019-11-06
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: S. Bierwirth;Gabriel Honorio;C. Gainaru;R. Böhmer
• 通讯作者: R. Böhmer

Generic Primary Mechanical Response of Viscous Liquids.

粘性液体的一般初级机械响应

• DOI: 10.1103/physrevlett.119.248001
• 发表时间: 2017
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: S. P. Bierwirth; R. Böhmer; C. Gainaru
• 通讯作者: C. Gainaru

Linear and nonlinear shear studies reveal supramolecular responses in supercooled monohydroxy alcohols with faint dielectric signatures.

线性和非线性剪切研究揭示了具有微弱介电特征的过冷一元醇中的超分子响应。

• DOI: 10.1063/1.5086529
• 发表时间: 2019-03-14
• 期刊: The Journal of chemical physics
• 作者: S. Bierwirth;Gabriel Honorio;C. Gainaru;R. Böhmer
• 通讯作者: R. Böhmer

Scaling of Suprastructure and Dynamics in Pure and Mixed Debye Liquids

纯德拜液体和混合德拜液体中上层结构和动力学的标度

• DOI: 10.1007/978-3-319-72706-6_5
• 发表时间: 2018
• 作者: S. P. Bierwirth; J. Bolle; S. Bauer; C. Sternemann; C. Gainaru; M. Tolan; R. Böhmer
• 通讯作者: R. Böhmer