混凝土中微波型主动控释胶囊的制备及释放行为  

Preparation and Release Behavior of Microwave Active Controlled Release Capsule in Concrete

作　　者：张琪 冯攀 王浩川 邵丽静 叶少雄 冉千平 ZHANG Qi;FENG Pan;WANG Haochuan;SHAO Lijing;YE Shaoxiong;RAN Qianping(Jiangsu Key Laboratory of Construction Materials,School of Materials Science and Engineering,Southeast University,Nanjing 211189,China;State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China)

机构地区：[1]东南大学材料科学与工程学院,江苏省土木工程材料重点实验室,南京211189 [2]高性能土木工程材料国家重点实验室,南京210008

出　　处：《材料导报》2022年第4期97-103,共7页Materials Reports

基　　金：国家自然科学基金(51890904,52078126);高性能土木工程材料国家重点实验室开放基金(2018CEM001)。

摘　　要：设计并制备了一种混凝土主动控释胶囊,该胶囊能够在微波信号刺激下主动控制释放内部装载的芯材外加剂。采用扫描电镜、X-射线断层扫描仪、电位滴定仪对胶囊及其释放行为进行表征,通过释放动力学模型拟合和极差与方差分析,探讨了胶囊的释放机制和释放率的影响因素。结果表明:胶囊的平均装载能力为34.71%;施加微波后产生响应可缓慢持续释放芯材,释放机制主要为芯材分布于多孔载体孔隙中的Fick扩散机制;各影响因素对释放率的影响程度为:微波功率>微波处理时间>石蜡厚度>Fe_(3)O_(4)掺量;初步证明了胶囊在砂浆中具有微波主动控制释放的性能。该胶囊的应用有望解决直掺外加剂产生的负面效果以及混凝土硬化后其性能难以改善等问题。Akind of concrete-based active controlled release capsule was designed and prepared.The capsule can release the core material actively under the stimulation of microwave signal.Capsule and its release behavior were characterized by scanning electron microscopy,X-ray computed tomography and potentiometric titration.The release mechanism and influencing factors of release ratio were discussed by fitting the release kinetics model and analyzing the range and variance.The results show that the average loading capacity of the capsule is 34.71%;the core material can be released slowly and continuously after the microwave is applied;the release mechanism is mainly Fick diffusion mechanism with core materials distributed in the pores of porous carrier;the influence degree of each influencing factor on the release ratio is microwave power>microwave treatment time>paraffin thickness>Fe_(3)O_(4) content;it is preliminarily proved that the capsule has the property of microwave active control release in mortar.The application of the capsule is expected to solve the negative effects of direct admixtures and the difficulty in improving the properties of concrete after hardening.

关 键 词：胶囊 微波 主动控制释放 释放动力学模型 

分 类 号：TU528[建筑科学—建筑技术科学]