Sustainable Functional Biomaterials Laboratory, Department of Wood Science, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Sustainable Functional Biomaterials Laboratory, Department of Wood Science, The University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Carbohydr Polym. 2022 Sep 1;291:119583. doi: 10.1016/j.carbpol.2022.119583. Epub 2022 May 7.
Phase change materials (PCM) have been increasingly used over the past decades in applications requiring thermal energy storage or maintaining temperature uniformity, in particular in the textile industry. Organic PCM is desired in temperature control, but it suffers from thermal leaking and unstable form during phase transition. Here, cellulose nanofibrils (CNFs) were used as emulsifiers to stabilize paraffin Pickering emulsion by ultrasonication. Results indicated uniform PCM emulsion particles of 4.2 ± 2.1 μm could be obtained using 0.8 wt% CNF suspension sonicated at 100%A and 7 mins with 2:8 paraffin to CNF ratio. The CNF-stabilized paraffin emulsion showed excellent long-term stability with unchanged particle size when stored at 45 °C for 28 days. In addition, differential scanning calorimetry (DSC) results showed high thermal stability after 51 heating-cooling cycles with high latent heat of 117.6 J/g. The CNF-stabilized paraffin emulsion can be facilely spray-coated onto fabric to prepare thermal regulating textile.
在过去几十年中，相变材料（PCM）在需要热能存储或保持温度均匀性的应用中得到了越来越多的应用，特别是在纺织工业中。有机 PCM 适用于温度控制，但在相变过程中存在热泄漏和不稳定的问题。在这里，纤维素纳米纤维（CNF）被用作乳化剂，通过超声处理来稳定石蜡 Pickering 乳液。结果表明，使用 0.8wt%的 CNF 悬浮液在 100%A 和 7 分钟的超声处理下，以 2:8 的石蜡与 CNF 比例，可以获得粒径均匀的 4.2±2.1μm 的 PCM 乳液颗粒。当在 45°C 下储存 28 天时，CNF 稳定的石蜡乳液表现出优异的长期稳定性，粒径没有变化。此外，差示扫描量热法（DSC）结果表明，在经过 51 次加热-冷却循环后具有高的热稳定性，潜热高达 117.6 J/g。CNF 稳定的石蜡乳液可以简单地喷涂到织物上，制备调温纺织品。
