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Figure 1. (a) Synthesis strategy of the Ca-gel adhesive. (b) Photographs of the developed Ca-gel adhesive. SEM (c, d) and SEM-EDS mappings (d₁-d₄) of Ca-gel. XRD (e), FTIR (f), XPS (g), and TG (h) of Gel (without mineralization) and Ca-gel.

Figure 2. (a) Adhesive strategies for ancient ivory fracture samples (left, direct bonding method) and powderization (right, in situ bonding method). (b) FTIR spectra of untreated ivory and treated Ca-gel/ivory from the in situ bonding method. High-resolution XPS spectra of Ca 2p (c) and C (d) of ivory and Ca-gel/ivory from in situ bonding method. (e) Fluorescence tracer of the ancient ivory treated by Ca-gel-CdTe/ZnS from in situ bonding method. SEM (f, g) and SEM-EDS (g₁-g₄) of the powdered Ca-gel/ivory from the in-situ bonding method.

Figure 3. (a) Comparison of adhesive properties between Ca-gel and Gel, test mode diagram. (b₁) Ca-gel adhesive performance test of the bonded Ca-gel/glass. (b₂) Gel (without mineralization) adhesive performance test of the bonded Ca-gel/glass. (c) UVA cycles of Ca-gel/ivory from direct bonding method with standard deviation. (d) HTA cycles of Ca-gel/ivory from direct bonding method with standard deviation. (e) Schematic diagram of protection mechanism of ancient ivory by Ca-gel. (f) Fluorescence tracer technique was used to detect temporary adhesive properties and residual adhesive removal. (g) Temporary adhesive properties of Ca-gel on ancient ivory for direct bonding applications.

Figure 4. (a) Ca-gel-bonded aluminum sheets. (b) Ca-gel-bonded glass sheets. (c) Ca-gel-bonded silicon nitride ceramic sheets. (d) Ca-gel restorative adhesive ceramic bowl and its strength detection. (e) Ca-gel restorative adhesive pottery figurine and its strength detection from the direct bonding method.

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