Sodium Alginate/Carboxyl-Functionalized Graphene Composite Hydrogel Via Neodymium Ions Coordination

doi:10.1016/j.jmst.2016.11.003

Abstract

Abstract:

A facile method for the preparation of sodium alginate (SA)/carboxyl-functionalized graphene (G-COOH) composite hydrogel was developed. Based on the coordination ability of lanthanide ions to the carboxyl groups, a series of hydrogel derived from different ratios of SA and G-COOH was fabricated by neodymium (Nd³⁺) ions coordination. A relatively uniform layered structure was recorded by SEM at the interior of SA/G-COOH hydrogel. Several parameters such as water content, swelling ratio (SR), tensile test and solvent resistance were also investigated. The SA/G-COOH composite hydrogel showed excellent mechanical strength, and the tensile strength of SA/G-COOH composite hydrogel reaches 53.72 MPa at high water content. Due to the coordination ability of Nd³⁺ ions, the hydrogel also exhibited an excellent solvent resistance and stability.

Key words: Carboxyl-functionalized graphene, Sodium alginate, Hydrogel, Neodymium ions coordination, Layered structure

Huang Qianqian, Liu Shunli, Li Kewen, Hussain Imtiaz, Yao Fang, Fu Guodong. Sodium Alginate/Carboxyl-Functionalized Graphene Composite Hydrogel Via Neodymium Ions Coordination[J]. J. Mater. Sci. Technol., 2017, 33(8): 821-826.

Figures/Tables 7

Fig. 1. Fabrication process of SA/G-COOH composite hydrogel: (a) The mixed solution of SA/G-COOH in rectangle mold was immerged into the Nd3+ ions solution and successfully self-assembled to hydrogel by ions coordination, (b) the schematic diagram of coordination between SA and G-COOH with Nd3+ ions, (c) digital photograph of SA/G-COOH hydrogel, and (d) SEM image for the cross-sectional morphology of SA/G-COOH composite hydrogel.

Fig. 2. FTIR spectra of G-COOH, SA and SA/G-COOH-4 composite hydrogel.

Fig. 3. (a) XPS spectra of SA/G-COOH/Nd(III) hydrogel and (b) core-level C1s, (c) core-level O1s and (d) core-level Nd3d of SA/G-COOH/Nd(III) hydrogel.

Fig. 4. SEM images of cross-sectional morphological structure of SA/G-COOH-4 composite gel with different amplifications.

Fig. 5. (a) Swelling ratio of SA/G-COOH hydrogels with different G-COOH contents and (b) effect of pH values on SR of SA/G-COOH-2 and SA/G-COOH-4.

Fig. 6. (a) Typical strain-stress curves of SA paper, SA/G-COOH-1, SA/G-COOH-2, SA/G-COOH-3, and SA/G-COOH-4 composite hydrogels; (b and c) ultimate strength and toughness of SA/G-COOH composite hydrogels.

Table 1 Solvent uptake rate of the SA/G-COOH-4 hydrogels in various swelling mediums

Solvent uptake rate (%)	SA/G-COOH-4^a	SA/G-COOH-4^b
Deionized water	41.7%	42.5%
Anhydrous ethanol	0	0
THF	2.3%	5.2%
DMF	1.2%	1.5%

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