Multifunctional Fire‐Resistant Paper Based on Ultralong Hydroxyapatite Nanowires†

Abstract

Nanowires | Hydroxyapatite | Fire-resistant paper | Nanostructures | Green chemistry Paper was one of the greatest inventions in ancient China, and it greatly promoted the rapid development of human civilization. Even in today's electronic information age, paper and paper-derived products are still indispensable to people's daily work and life. However, the traditional paper based on cellulose fibers from plants has some problems. For instance: (1) papermaking consumes a large amount of precious natural resources such as trees; (2) the papermaking industry causes environmental pollution; (3) the traditional paper consisting of organic cellulose fibers is highly flammable and easy to burn; (4) the traditional paper based on cellulose fibers turns to yellow color with time; (5) the lifetime of the traditional paper is relatively short because of the degradation of cellulose fibers. More efforts are needed to investigate and solve these problems facing the traditional paper. In recent years, a new kind of multifunctional fire-resistant paper based on ultralong hydroxyapatite nanowires has been developed and investigated for various applications, and many research findings have been documented in the literature. This review article provides a comprehensive summary and discussion on recent research advances for this new kind of multifunctional fire-resistant paper based on ultralong hydroxyapatite nanowires, including the synthesis, properties, applications, and future perspectives.

A Superhydrophobic Hydrogel for Self‐Healing and Robust Strain Sensor with Liquid Impalement Resistance

“…Recently, many superhydrophobic strain sensors have been fabricated to extend the application scope. [ 12‐17 ] For instance, Megaridis et al . first fabricated the stretchable superhydrophobic coating by mixing the polyolefin and carbon nanofibres.…”

Microwave-Assisted Hydrothermal Rapid Synthesis of Ultralong Hydroxyapatite Nanowires Using Adenosine 5′-Triphosphate

“…Recently, the authors’ research group put forward the term “ultralong hydroxyapatite nanowires”. The ultralong hydroxyapatite nanowires are defined as the hydroxyapatite nanowires with diameters smaller than 100 nm, lengths larger than 100 μm, and aspect ratios higher than 1000 [ 22 , 23 , 24 ]. Furthermore, the authors’ research group developed the calcium oleate precursor solvothermal method for the synthesis of ultralong hydroxyapatite nanowires with diameters of 10~20 nm and lengths up to several hundred micrometers [ 25 , 26 , 27 , 28 , 29 ].…”

“…The aspect ratios of ultralong HAP nanowires could reach as high as >10,000, leading to high flexibility, which can solve the problems of high brittleness and hardness of the traditional HAP materials [ 28 , 29 ]. On the other hand, ultralong HAP nanowires, from the structural standpoint, have advantages of high flexibility, high toughness and high strength, and can be interwoven into a high-strength porous networked structure [ 22 , 23 ]. Generally, the higher aspect ratios of HAP nanowires (with nanoscale diameters and larger lengths) can greatly enhance their properties and thus promote their diverse applications [ 29 , 30 ].…”

“…In addition, the highly efficient calcium oleate precursor microwave hydrothermal method was also developed for the rapid and energy-saving synthesis of ultralong HAP nanowires [ 32 ]. Furthermore, ultralong HAP nanowires have been adopted as the building material to prepare the flexible inorganic paper sheets with various functions, which are promising for a variety of applications, such as the fire resistance [ 22 , 23 , 25 ], fire-retardant high-temperature-resistant label paper and Xuan paper [ 33 , 34 ], waterproof [ 35 ], water purification [ 36 , 37 ], multimode anti-counterfeiting [ 38 ], information encryption and decryption [ 39 ], solar energy-driven desalination of seawater [ 40 ], and biomedical applications [ 41 , 42 , 43 , 44 ]. In particular, the ultralong HAP nanowire-based biopapers, hydrogels, aerogels, and bone repair scaffolds are highly biocompatible and bioactive to promote the new bone growth inside the porous network in vivo, providing a series of potential clinical alternatives for bone defect repair and skin wound healing [ 41 , 42 , 43 , 44 , 45 , 46 ].…”

Preparation, structure and application of styrene-acrylic emulsion/modified ammonium polyphosphate in flame retardant air filter paper

“…[15][16][17] To break the foreign monopoly in the field of flame-retardant air filter paper and improve the competitiveness of this industry in my country, the research and development of highly effective flame-retardant air filter paper with better mechanical properties have become an urgent issue to be solved in China. [18][19][20][21] Ammonium polyphosphate (APP) is a high-efficiency flame retardant with P and N flame-retardant elements simultaneously, which has the advantages of low price, low smoke, non-toxic, halogen-free, and so on. It is widely used in flame-retardant paper, fireretardant coatings, fire extinguishing agents, [22][23][24][25][26][27] and other fields.…”