Microfluidic fabrication and thermal characteristics of core–shell phase change microfibers with high paraffin content

Wen, Guo-Qing; Xie, Rui; Wan, Liang; He, Xiao-Heng; Wang, Wei; Ju, Xin; Chu, Liang‐Yin

doi:10.1016/j.applthermaleng.2015.05.036

Cited by 32 publications

(18 citation statements)

References 33 publications

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“…Recently, many techniques have been developed to produce microfibers with different morphologies and applications. The most common techniques used to solidify the liquid jet into microfiber are photopolymerization, ,, chemical reaction, , and solvent removal. , In photopolymerization and chemical reaction approaches, the entire jet reacts and is converted into a solid fiber, and hence producing small-diameter fibers is challenging. Due to this, the smallest reported fiber diameters from these methods are of the order of a few tens of microns.…”

Section: Introductionmentioning

confidence: 99%

Microfluidics-Based On-Demand Generation of Nonwoven and Single Polymer Microfibers

Pullagura

Gundabala

2020

Langmuir

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In this work, we present a microfluidics-based microfiber fabrication method with the ability to control both the fiber size and the extent of coiling of the generated fiber. This latter feature allows on-demand generation of both nonwoven and single fiber within the same device, broadening the scope of application of the fabricated fibers. Using a hybrid poly(dimethylsiloxane) (PDMS)-glass microfluidic device, we implement a coflowing solvent removal technique to generate poly(ethylene oxide) (PEO) fibers. Characterization of fibers by Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) confirms the production of solvent-free, pure PEO fibers. Control over fiber size using both inner and outer liquid flow rates is demonstrated by scanning electron microscopy (SEM) imaging. More crucially, we employ a complementary flow toward the downstream end of the fiber solidification region to control the extent of coiling of the generated fiber. By simple variation of the complementary flow, we induce a transition from a nonwoven fiber to a single fiber. The presented technique is expected to broaden the scope of microfluidics as a tool for the continuous generation of microfibers with a wider range of applications than the existing microfluidics techniques.

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Section: Introductionmentioning

confidence: 99%

Microfluidics-Based On-Demand Generation of Nonwoven and Single Polymer Microfibers

Pullagura

Gundabala

2020

Langmuir

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“…So far, the preparation of PCC fiber is mainly based on composite spinning, including wet-spinning, melt-spinning, and electrospinning [34][35][36]. For example, pure PCM or microencapsulated PCM can be mixed into polymer solution or its melt, which can be later spun into fibers [37]. However, the obtained fibers did not show a high enthalpy and their repeatability was quite low.…”

Section: D Composite Fibermentioning

confidence: 99%

Graphene Aerogel-Directed Fabrication of Phase Change Composites

Li¹,

Zhang²,

Zhang³

2018

Phase Change Materials and Their Applications

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Although phase change materials have been extensively used for thermal energy storage, various shortcomings such as low thermal conductivity, leakage during work, and shortage of multiple driving ways greatly hinder their practical applications. Among the new materials that can overcome these problems, graphene aerogel has attracted special interest owing to its 3D conductive network and extraordinary capillary force. In this chapter, we review recent progress of graphene-aerogel-based phase change composites (PCCs) and provide a brief introduction on the following topics: 1) why graphene aerogels can be used for PCCs, 2) the sol-gel transition synthesis of graphene aerogels, 3) the fabrication of graphene-aerogel-based PCCs, and 4) their applications in thermal energy storage, electric-thermal conversion and storage, solar-thermal conversion and storage, and thermal buffer. Finally, we also discuss the limitation and future development of these graphene-based materials.

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“…It was shown by Wen et al [27] and Zhang et al [28] that encapsulation of PCMs into fibers was also possible by using microfluidic principles. A triple coaxial flow that consisted on RT27 (paraffin based PCM), dimethyl sulfoxide (DMSO) solution containing 14 % by mass of Poly(vinyl butyral) and an aqueous solution of carboxymethylcellulose sodium (1% w/v) as inner, middle and outer fluids, respectively was created in a microfluidic device.…”

Section: Introductionmentioning

confidence: 99%

A facile approach for phase change material encapsulation into polymeric flexible fibers using microfluidic principles

Duran¹,

Nikulin²,

Dauvergne³

et al. 2022

Preprint

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It is widely agreed that phase change materials (PCMs) are of high interest for sustainable energy future. Many of the applications require anti-leakage properties of PCM, that can be acomplished through PCM encapsulation. In this study, scalable and considerably simplified approach based on the microfluidics principles was successfully designed for polyvinylidene fluoride (PVDF) hollow-and for leakage-free paraffin-core/PVDF-sheath fibers production. The required device can be as simple as syringe+tube+glass capillary. The fibers were created by PVDF/N,N-Dimethylformamide (DMF) solution and PVDF/DMF/paraffin emulsion injection in water followed by solvent extraction process.The proposed approach results in a hollow PVDF or PVDF/paraffin composite fibers with the PCM content between 32-47.5% according to DSC and TGA measurements. SEM study of the fibers morphology has shown that PCM is in the form of slugs along the fibers. Such PCM distribution is maintained until the first melting cycle. Later, molten PCM spreads within the fiber under capillary forces that was captured by infrared camera. Elastic modules and stress vs. strain were measured to characterise mechanical properties of designed fibers. Finally, the composite fibers have shown outstanding retention capacity with only 3.5% of PCM mass loose after 1000 melting/crystallisation cycles.

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Microfluidic fabrication and thermal characteristics of core–shell phase change microfibers with high paraffin content

Cited by 32 publications

References 33 publications

Microfluidics-Based On-Demand Generation of Nonwoven and Single Polymer Microfibers

Microfluidics-Based On-Demand Generation of Nonwoven and Single Polymer Microfibers

Graphene Aerogel-Directed Fabrication of Phase Change Composites

A facile approach for phase change material encapsulation into polymeric flexible fibers using microfluidic principles

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