Wax Blends as Tunable Encapsulants for Soil-Degradable Electronics
Wax Blends as Tunable Encapsulants for Soil-Degradable Electronics
复制标题
DOI：
10.1021/acsaelm.2c00833
复制
发表时间：
2022-10-10
影响因子：
4.7
通讯作者：
Whiting, Gregory L.
中科院分区：
文献类型：
--
作者：
Atreya, Madhur;Marinick, Gabrielle;Whiting, Gregory L.
印刷的可生物降解的电子产品有可能在高空间密度下监测各种土壤参数，同时最大限度地减少成本和浪费。可调的可降解密封剂是土壤可降解电子设备中的关键组分，因为它用于延迟水、微生物和负责底层功能材料降解的其他试剂的进入。在这里，共混物的蜂蜡和商业大豆蜡作为可调的可生物降解的封装材料的瞬态土壤传感器。使用差示扫描量热法，我们首先表明，这两种蜡的共混物具有有限的溶解性，这使得降解时间的编程。土壤中的实验室降解试验表明，封装装置的寿命可通过组分大豆和蜂蜡的比例来控制，100%蜂蜡可达100天，添加25%大豆蜡可不到10天。蜂蜡混合物中10%大豆蜡的1.6 mm厚涂层可保护器械12周。此外，熔融加工的蜂蜡澄清剂被用作一种简单的方法，以延迟可快速生物降解的材料（如木桩）的降解，这些材料可用于容纳土壤可降解的电子设备。
Printed biodegradable electronics potentially enable the monitoring of various soil parameters at a high spatial density while minimizing cost and waste. A tunable degradable encapsulant is a critical component in a soil-degradable electronic device, as it acts to delay the ingress of water, microbes, and other agents responsible for degradation of underlying functional materials. Here, blends of beeswax and commercial soy wax are presented as tunable biodegradable encapsulant materials for transient soil sensors. Using differential scanning calorimetry, we first show that the blends of the two waxes have limited miscibility, which enables programming of degradation times. Laboratory degradation tests in soil revealed that the longevity of encapsulated devices can be controlled by the ratio of the component soy and beeswax, with up to 100 days with 100% beeswax and less than 10 days with the addition of 25% soy wax by mass. Thicker coatings of 1.6 mm of 10% soy wax in beeswax blends are shown to protect devices for 12 weeks. Additionally, melt-processed beeswax encapsulants are used as a simple method to delay the degradation of otherwise rapidly biodegradable materials, such as wooden stakes, that could be used to house soil-degradable electronic devices.