Concurrent determination of heat and capacity change of a sessile droplet using a single measurement

IF 4.1 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Sensors and Actuators A-physical Pub Date : 2024-11-08 DOI:10.1016/j.sna.2024.116042

Hanliang Zhu , Haiyang Lu , Yue Zhang , Haotian Xu , Jan Brodský , Imrich Gablech , Jianguo Feng , Qilong Yan , Pavel Neuzil

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Abstract

Microcalorimetry, designed for the independent measurement of enthalpy and heat capacity, has been commercially available for a considerable time. However, heat-related states in samples, especially liquids, can introduce complicated phenomena and challenging measurement and data evaluation processes. Such complexity becomes apparent when observing fluctuations in heat capacity (C_p) while measuring heat consumption (Q) during water evaporation. This paper presents a continuous heat pulse measurement (CHPM) method for concurrently analyzing Q and C_p in a single test using microcalorimetry. The sample droplet of 400 nL was directly dispensed on the microcalorimeter surface, followed by a light-emitting diode (LED) radiation generating heat to perform CHPM. We repetitively heated the microcalorimeter using heat pulses provided by LED irradiation, with their duration set to 100 ms and 10 s repetition, while measuring the temperature response of the microcalorimeter. A MATLAB-based simulation model was established to validate the accuracy of our C_p measurements, which show its value of 0.79 % of minimum variance. Water evaporation coupled with simultaneous salt crystallization served as our study model, where the C_p values were calculated from real-time responses to heat pulses provided by LED. The experimental outcomes confirm the suitability of CHPM in extracting key thermal properties and emphasize its versatility as a diagnostic tool, providing a significant method for research and applications in the fields of physics, engineering, and beyond.

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通过一次测量同时测定无柄液滴的热量和容量变化

微量热仪是专为独立测量焓和热容量而设计的，在市场上销售已有相当长的时间。然而，样品（尤其是液体）中与热有关的状态会带来复杂的现象，并对测量和数据评估过程提出挑战。在测量水蒸发过程中的热量消耗（Q）时，观察热容量（Cp）的波动就会发现这种复杂性。本文介绍了一种连续热脉冲测量（CHPM）方法，利用微量热仪在一次测试中同时分析 Q 和 Cp。将 400 nL 的样品液滴直接滴在微量热仪表面，然后用发光二极管（LED）辐射产生热量，进行 CHPM。我们使用 LED 照射提供的热脉冲重复加热微量热计，持续时间设定为 100 毫秒，重复 10 秒，同时测量微量热计的温度响应。我们建立了一个基于 MATLAB 的模拟模型来验证 Cp 测量的准确性，结果显示其值为 0.79 % 的最小方差。水蒸发与盐结晶同时作为我们的研究模型，其中的 Cp 值是根据对 LED 提供的热脉冲的实时响应计算得出的。实验结果证实了 CHPM 在提取关键热特性方面的适用性，并强调了其作为诊断工具的多功能性，为物理学、工程学等领域的研究和应用提供了重要方法。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...