Nano-SiC改性正十五烷相变胶囊的微流控制备及表征

李启慧; 尹帅; 吴自德; 徐旭栋; 闫珂瑾; 彭浩

doi:doi:10.19912/j.0254-0096.tynxb.2024-0298

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Nano-SiC改性正十五烷相变胶囊的微流控制备及表征

更新时间：2025-12-02

- Nano-SiC改性正十五烷相变胶囊的微流控制备及表征
- Vol. 46, Issue 6, Pages: 173-183(2025)
- 作者机构：
- 作者简介：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-0298
  CLC： TU522
- Published Online：07 July 2025，
  
  Published：2025
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李启慧, 尹帅, 吴自德, et al. Nano-SiC改性正十五烷相变胶囊的微流控制备及表征[J]. 2025, 46(6): 173-183.
DOI：

李启慧, 尹帅, 吴自德, et al. Nano-SiC改性正十五烷相变胶囊的微流控制备及表征[J]. 2025, 46(6): 173-183. DOI： doi:10.19912/j.0254-0096.tynxb.2024-0298.

摘要

提出一种关于相变胶囊（EPCMs）的快捷微流控制备方法。通过浸入式共轴流毛细管微流控装置辅以紫外光固化制备C15/TMPTA EPCMs

并添加碳化硅对壳材进行导热改性处理。采用高速摄像机、扫描电子显微镜（SEM）、光学显微镜（OM）、傅里叶红外光谱仪（FT-IR）、X射线衍射仪（XRD）、差式扫描量热仪（DSC）、热重分析仪（TGA）、激光导热仪（LFA）等表征手段探究复合液滴生成和EPCMs性能。结果表明：在所选择的流量参数范围内

复合液滴生成过程存在滴流、核心泄漏和射流3种现象。在滴流和射流现象下

均生成稳定的复合液滴;而当流量比（Qi/Qo）大于1.5、流量之和（Qtotal）小于160 μL/min时

核心液滴会发生泄漏

导致复合液滴无法正常生成。核心液滴及复合液滴尺寸随外相毛细数（Cao）的增大而减小

复合液滴生成频率随Cao的增大而增大。此外

在Qi/Qo为0.5、1.0、1.5

Qtotal为150 μL/min时

制备的EPCMs呈多核结构

具有高单分散性（变异系数（Cv）<4%）

且尺寸可控

粒径为1.32~1.55 mm。添加质量分数为2%的纳米碳化硅进行改性

可提高EPCMs的封装率（提高16.17%）和热循环稳定性

在25次热循环后焓值仅降低1.19%。

Abstract

The paper proposes a rapid microfluidic fabrication method for encapsulated phase change materials （EPCMs）. C/TMPTA EPCMs are prepared using an immersed co-flowing capillary microfluidic device with UV-curing

supplemented by thermally conductive modification of the shell material with silicon carbide. Characterization techniques including high-speed cameras

SEM

FT-IR

XRD

DSC

TGA and LFA are utilized to investigate the generation of compound droplets and the properties of EPCMs. The results show that within the selected range of flow rate parameters

the generation process of compound droplets exhibits three phenomena： dripping

core leakage and jetting. Under dripping and jetting phenomena

stable compound droplets are formed. However

when the flow rate ratio （/） is larger than 1.5 and the total flow rate （） is less than 160 µL/min

the core droplet will leak

resulting in the inability to generate the composite droplet normally. The sizes of core and compound droplets decrease with an increase in the outer phase capillary number （）

while the frequency of compound droplet generation increases with . Moreover

EPCMs prepared at / of 0.5

1 and 1.5

with a of 150 µL/min

exhibit a multi-core structure

high monodispersity （with a coefficient of variation （） <4%） and controllable size

ranging from 1.32 to 1.55 mm in diameter. The addition of 2wt% nano silicon carbide for modification enhances the encapsulation efficiency of EPCMs （increased by 16.17%） and thermal cycling stability

with only a 1.19% decrease in enthalpy value after 25 thermal cycles.

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