推 荐 人:张笑妍

文献信息1C. Vakifahmetoglua, D. Zeydanlib, P. Colombo. Porous polymer derived ceramics, Materials Science and Engineering R, 2016, 106: 1-30.

推荐理由:该综述阐述了陶瓷前驱体聚合物在制备多孔陶瓷方面的应用,主要按以下几种方法进行了介绍:牺牲模板法、发泡法、刻蚀法、冷冻凝胶成型法、乳液法以及气凝胶。该类多孔陶瓷制备方法具有以下特点:聚合物可在较低温度下转换为陶瓷;聚合物前驱体可通过低成本的塑性成形技术成型,如注塑成型、挤出成型、熔融纺丝、3D打印技术等;可利用聚合物独特的性质如塑性、原位逸出气体、CO2可溶解性等设计技术路线;中间产物兼具聚合物纳米结构及陶瓷的性能。

Abstract: Porous ceramics, in particular cellular ceramics with open and closed porosity, are key enabling components in different demanding applications because of their favorable set of properties. The production of porous ceramics from preceramic polymers offers advantages in terms of simple processing methodology, low processing cost, and ease of control over porosity and other properties arising from the composition of the resultant ceramics. Therefore, a vast amount of research has been conducted, in the past decade, towards the fabrication and characterization of porous ceramics produced from different polymeric precursors, such as polysiloxane, polycarbosilane, polysilazane and borazine. The potential of polymer-derived-ceramics can only be fully achieved if the type of fabrication method used is tailored taking into account the specific application of interest. For brevity, this review deals specifically with the different processing strategies employed to obtain, from polymer precursors, ceramic foams, membranes, aerogels or porous ceramics for which porosity higher than 50 vol% has been deliberately introduced, including also components with high specific surface area or hierarchical porosity. The different processing strategies, such as replica, sacrificial template, direct foaming, etching, aerogel forming, fiber spinning and automated manufacturing, are explained and the published literature has been reviewed with particular concern for the critical issues that affect the pore size, the amount of porosity and strength of the ceramic components.

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文献信息2J. T. Muth, P. G. Dixon, L. Woish, et al. Architected cellular ceramics with tailored stiffness via direct foam writing, Proceedings of the National Academy of Sciences of the United States of America, 2017, 114(8): 1832-1837.

推荐理由:多级孔结构在自然界中广泛存在,并具有低密度、高比表面积以及多种功能特性。本文直接打印颗粒稳定泡沫墨水,通过调控组分、打印路径、干燥及烧结条件,制备得到具有多种变形模式、超常比刚度(>107 Pa/(kg/m3))的蜂窝结构材料。

Abstract: Hierarchical cellular structures are ubiquitous in nature because of their low-density, high-specific properties, and multifunctionality. Inspired by these systems, we created lightweight ceramic architectures composed of closed-cell porous struts patterned in the form of hexagonal and triangular honeycombs by direct foam writing. The foam ink contains bubbles stabilized by attractive colloidal particles suspended in an aqueous solution. The printed and sintered ceramic foam honeycombs possess low relative density (6%). By tailoring their microstructure and geometry, we created honeycombs with different modes of deformation, exceptional specific stiffness, and stiffness values that span over an order of magnitude. This capability represents an important step toward the scalable fabrication of hierarchical porous materials for applications, including lightweight structures, thermal insulation, tissue scaffolds, catalyst supports, and electrodes.

下载地址:http://www.pnas.org/content/114/8/1832.full.pdf

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