Way to a Library of Ti‐Series Oxide Nanofiber Sponges that are Highly Stretchable, Compressible, and Bendable

Abstract

Ti‐series oxide ceramics in the form of aerogels, such as TiO2, SrTiO3, BaTiO3, and CaCu3Ti4O12, hold tremendous potential as functional materials owing to their excellent optical, dielectric, and catalytic properties. Unfortunately, these inorganic aerogels are usually brittle and prone to pulverization owing to weak inter‐particulate interactions, resulting in restricted application performance and serious health risks. Herein, a novel strategy is reported to synthesize an elastic form of an aerogel‐like, highly porous structure, in which activity‐switchable Ti‐series oxide sols transform from the metastable state to the active state during electrospinning, resulting in condensation and solidification at the whipping stage to obtain curled nanofibers. These curled nanofibers are further entangled when flying in the air to form a physically interlocked, elastic network mimicking the microstructure of high‐elasticity hydrogels. This strategy provides a library of Ti‐series oxide nanofiber sponges with unprecedented stretchability, compressibility, and bendability, possessing extensive opportunities for greener, safer, and broader applications as integrated or wearable functional devices. As a proof‐of‐concept demonstration, a new, elastic form of TiO2, composed of both “white” and “black” TiO2 nanofiber sponges, is constructed as spontaneous air‐conditioning textiles in smart clothing, buildings, and vehicles, with unique bidirectional regulation of radiative cooling in summer and solar heating in winter.

Fabrication of a core–shell nanofibrous wound dressing with an antioxidant effect on skin injury

“…We applied electrospinning technology to design wound dressing materials with bioactive and biocompatible properties, as it is a practical and mature technology for producing nanofibers with porous structures. 11,12 The electrospun nanofiber dressings have a three-dimensional grid structure, allowing water and oxygen exchange. 13,14 Moreover, the electrospun nanofiber dressing with a bioactive substance could simulate the extracellular matrix and promote cell adhesion and migration on the fiber surface.…”

Synthesis, characterization and properties of indium-doped manganese oxide molecular sieve sponges

“…19 Some sponges/foams are usually prepared via a conventional ceramic route with hightemperature calcinations; however, this route is unsuitable for fabricating manganese oxide sponges because most manganese oxides exhibit metastable phases due to oxygen loss at high temperatures. 20 A mild route through the self-assembly of nanowires/nanorods 21,22 may be more suitable to fabricate manganese oxide sponges. Oxides/sulfides doped with heteroatoms can be widely utilized.…”

TiO2/SiO2 spiral crimped Janus fibers engineered for stretchable ceramic membranes with high-temperature resistance

“…Significantly, state-of-the-art research studies have achieved highly stretchable, compressible and bendable properties of ceramic nanofibrous materials, 25 obtained by complicated and sophisticated fabrication ( e.g. chemical vapor deposition, 26 3D reaction electrospinning 27 ).…”