Three-dimensional transition metal hydroxide monoliths were facilely fabricated by a sol-gel process accompanied by phase separation in the presence of polyacrylic acid (PAA) and propylene oxide (PO). In the typical ZnCl₂-PAA-PO system, PAA is used as a phase separation inducer as well as a framework former to control the phase separation and the formation of macrostructures, whereas PO works as a proton scavenger to initiate the gelation of the system and freeze the macrostructures. Appropriate amount of PAA, PO and solvents allow the formation of zinc (Zn) hydroxide monolith with cocontinuous skeletons and interconnected macropores, and the construction mechanism and characteristics of macrostructure are also investigated. The resultant dried gels are amorphous Zn hydroxide monolith with a narrow macropore size distribution (~1 μm). This approach is further used to successfully prepare macroporous single or binary composite transition metal hydroxide monoliths.

在聚丙烯酸（PAA）和环氧丙烷（PO）的存在下，通过溶胶-凝胶工艺轻松地制造三维过渡金属氢氧化物整料，并进行相分离。在典型的ZnCl _2中-PAA-PO系统，PAA用作相分离诱导剂以及框架形成剂，以控制相分离和宏观结构的形成，而PO用作质子清除剂，引发系统的凝胶化并冻结宏观结构。适量的PAA，PO和溶剂可形成具有连续骨架和相互连接的大孔的氢氧化锌（Zn）整体料，并研究了宏观结构的构造机理和特征。所得的干燥凝胶为具有窄大孔尺寸分布（〜1μm）的无定形氢氧化锌整料。该方法进一步用于成功制备大孔的单或二元复合过渡金属氢氧化物整料。