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With favorable properties of stretchability, stitchability, and potential to be woven into a fabric, thread-based sensors have gained considerable interest for wearable devices for smart and connected health applications. To facilitate wearable applications, an easy and reliable way to fabricate these thread-based sensors with good performance and consistency is the key while manufacturing these smart threads. In this paper, we propose an automated thread-coating system that can fabricate thread-based strain sensors with controlled parameters. The platform uses integrated sensors for controlled manufacturing of the threads in a highly compact structure that consists of an innovative tension sensor and a closed-loop thermal management system. Using this new system, a sample thread with a gauge factor of 1.47 and tension sensitivity of 32.64 K Ω /N is prepared. Compared with hand-coated thread, the machine-fabricated thread shows much better sensitivity and consistency. The prepared strain sensor is made into a respiration sensor patch and a limb motion patch to demonstrate its application. [ABSTRACT FROM AUTHOR]

With favorable properties of stretchability, stitchability, and potential to be woven into a fabric, thread-based sensors have gained considerable interest for wearable devices for smart and connected health applications. To facilitate wearable applications, an easy and reliable way to fabricate these thread-based sensors with good performance and consistency is the key while manufacturing these smart threads. In this paper, we propose an automated thread-coating system that can fabricate thread-based strain sensors with controlled parameters. The platform uses integrated sensors for controlled manufacturing of the threads in a highly compact structure that consists of an innovative tension sensor and a closed-loop thermal management system. Using this new system, a sample thread with a gauge factor of 1.47 and tension sensitivity of 32.64 KΩ/N is prepared. Compared with hand-coated thread, the machine-fabricated thread shows much better sensitivity and consistency. The prepared strain sensor is made into a respiration sensor patch and a limb motion patch to demonstrate its application.

Serotonin is a principal neurotransmitter that actively takes part in our behavioral as well as biological activities. Hence, its detection plays a vital role in understanding the intricate connections between this neurotransmitter and various physiological processes. Consequently, the development of sensitive and reliable electrochemical sensors for serotonin detection is of paramount importance. In this study, we present a different approach for synthesizing a highly stable composite of Nb2CTx and protonated carbon nitride (Nb2CTx/PCN) utilizing the electrostatic interaction between them. The synthesized Nb2CTx/PCN composite was utilized for the construction of an electrochemical sensor dedicated to serotonin analysis. The developed sensor exhibits remarkable performance, offering enhanced sensitivity, selectivity, and detection limits of 63.24 nM over a concentration range of 1–100 μM for serotonin detection in human serum. A versatile thread-based sensing platform is made to validate the sensor performance. Our findings pave the way for significant advancements in the field of MXene-based composites for neurotransmitter analysis, enabling researchers and clinicians to gain deeper insights into the role of serotonin in human health and diseases. [ABSTRACT FROM AUTHOR]

An indirect method and procedure for determining the local heat transfer coefficient in experimental studies on the intensity of heat transfer at a gas–surface interface is described. The article provides an overview of modern approaches and technical devices for determining the heat flux or friction stresses on surfaces in the study of thermophysical processes. The proposed method uses a constant-temperature hot-wire anemometer and a sensor with a thread sensitive element fixed on the surface of a fluoroplastic substrate. A substrate with the sensor's sensitive element was mounted flush with the wall of the investigated pipeline. This method is based on the Kutateladze–Leontiev approach (the laws of friction and heat transfer) and the hydrodynamic analogy of heat transfer (the Reynolds analogy): this is an assumption about the unity of momentum and heat transfer in a turbulent flow, which establishes a quantitative relationship between friction stresses on the heat exchange surface and heat transfer through this surface. The article presents a method for determining the speed of the developed measuring system. An example of a successful application of the proposed method in relation to the study of thermomechanical processes in the gas exchange systems of reciprocating internal combustion engines is described. [ABSTRACT FROM AUTHOR]