Highly Flexible and Nonflammable Inorganic Hydroxyapatite Paper

Abstract

A highly flexible and nonflammable inorganic hydroxyapatite (HAP) paper made from HAP ultralong nanowires is reported. The paper can be used for printing and writing and is promising for the permanent and safe storage of information, such as archives and important documents. The HAP paper is also an excellent and recyclable adsorbent for organic pollutants.

Calcium orthophosphates (CaPO 4 ): Occurrence and properties

“…Non-biomedical applications of HA include its using as an environmentalfriendly filler for elastomers (Pietrasik et al 2008), a lowtemperature sorbent (Bailliez et al 2004;Corami et al 2008) and/or stabilizer (Wang et al 2014b) of poisonous chemical elements, a high-temperature sorbent for carbon dioxide (Landi et al 2014), both a catalyst Rodrigues et al 2014) and a carrier for other catalysts (Domínguez et al 2009;Sun et al 2009;Vukomanović et al 2012), a material for ultraviolet light protection (Holzmann et al 2009) and sunscreen filter (Piccirillo et al 2014), as well as a component of various sensors (Nagai et al 1988;Petrucelli et al 1996;Tagaya et al 2010;Khairnar et al 2011). Finally, highly flexible and nonflammable inorganic paper could be prepared from HA (Lu et al 2014a).…”

Nanostructured Materials of Calcium Phosphates and Calcium Silicates: Synthesis, Properties and Applications

“…We prepared ultra-long HAP nanowires with high aspect ratios using calcium oleate as the precursor by the solvothermal method, and their hydrophilicity/hydrophobicity could be adjusted. [55] In our further research work, through optimizing the preparation method, we developed the solvothermal synthesis of submillimeter-sized ultra-long HAP nanowires using calcium oleate as the precursor and NaH 2 PO 4 as the phosphorus source in a series of monohydroxy alcohols. [56] The as-prepared ultra-long HAP nanowires had diameters of tens of nanometers and lengths from several hundred micrometers up to nearly one millimeter.…”

“…The highly flexible, nonflammable and environment-friendly inorganic HAP paper made from ultra-long HAP nanowires was investigated for the application as an excellent adsorbent for organic pollutants, and it exhibited high adsorption capacities for various organic pollutants. [55] The HAP paper could be easily separated from organic solvents and regenerated by heating, and the adsorbed organic solvents could be completely removed from the HAP paper for recycling. The regenerated HAP paper could be reused for the adsorption of organic pollutants and had similar adsorption capacities compared with the freshly prepared HAP paper.…”

“…By using this simple procedure, toluene could be completely separated from water and the polluted water was effectively purified. [55] Multifunctional nanostructured calcium phosphate systems…”

“…[63] Highly flexible, non-flammable and environmentfriendly HAP paper A new method was reported for the fabrication of a new kind of highly flexible, nonflammable and environment-friendly HAP paper using ultra-long HAP nanowires. [55] HAP nanowires with high aspect ratios were synthesized using calcium oleate as the precursor by the solvothermal method, and their hydrophilicity/ hydrophobicity could be adjusted. The as-prepared HAP paper was highly flexible and nonflammable, and it could be bent and rolled without visible damage.…”