Abstract：
In this work, the potential of bio-inspired strategies for the synthesis of calcium sulfate (CaSO4·nH2O) materials for heritage conservation is explored. For this, a nonclassical multi-step crystallization mechanism to understand the effect of calcein- a fluorescent chelating agent with a high affinity for divalent cations- on the nucleation and growth of calcium sulfate phases is proposed. Moving from the nano- to the macro-scale, this strategy sets the basis for the design and production of fluorescent nano-bassanite (NB-C; CaSO4·0.5H2O), with application as a fully compatible consolidant for the conservation of historic plasterwork. Once applied to gypsum (CaSO4·2H2O) plaster specimens, cementation upon hydration of nano-bassanite results in a significant increase in mechanical strength, while intracrystalline occlusion of calcein in newly-formed gypsum cement improves its weathering resistance. Furthermore, under UV irradiation, the luminescence produced by calcein molecules occluded in gypsum crystals formed upon nano-bassanite hydration allows the easy identification of the newly deposited consolidant within the treated gypsum plaster without altering the substrate\'s appearance.
摘要：
在这项工作中,探索了合成硫酸钙（CaSO4·nH2O）材料用于遗产保护的生物启发策略的潜力。为此，提出了一种非经典的多步骤结晶机理，以了解钙黄绿素-一种对二价阳离子具有高亲和力的荧光螯合剂-对硫酸钙相的成核和生长的影响。从纳米尺度到宏观尺度，该策略为设计和生产荧光纳米bassanite（NB-C;CaSO4·0.5H2O）奠定了基础，应用作为一种完全兼容的固结剂，用于保护历史石膏板。一旦应用于石膏（CaSO4·2H2O）石膏标本，胶结在水合纳米-massanite导致机械强度的显着增加，而钙黄绿素在新形成的石膏水泥中的晶体内闭塞改善了其耐候性。此外，在紫外线照射下，由钙黄绿素分子产生的发光被封闭在石膏晶体中形成的纳米babranite水合允许在处理的石膏灰泥中容易地识别新沉积的固结剂而不改变基底的外观。
