High‐Strength and High‐Toughness Double‐Cross‐Linked Cellulose Hydrogels: A New Strategy Using Sequential Chemical and Physical Cross‐Linking

Abstract

Figure 1 (a-c) were incorrectly assigned in the caption. The correct legend should read: "a-c) Photographs of the cellulose hydrogels: (a) physically cross-linked cellulose hydrogel, (b) DC cellulose hydrogel, and (c) chemically cross-linked cellulose hydrogel under bending." A reflection peak was incorrectly assigned throughout the manuscript. All occurrences of (200) should be changed to (110). All reflections labeled initially (110) in the manuscript instead represent (110) In consequence two passages on page 6282 should read as follows: "…which correspond to the (110) and (110) reflections, respectively, of cellulose II crystallite. [26] Therefore, …resulted from the (110) reflection of the cellulose II crystallite hydrates…". and "…the intensity of the peak at 20.2° for the (110) reflection of the cellulose II crystallite hydrates gradually increased, …" in addition text on page 6283 should appear as "Moreover, the intensity of the (110) reflection of the DC cellulose hydrogels increased as the concentration of aqueous ethanol increased…" and the corrected version of Figure 3 should appear as shown below: correction Figure 3. X-ray diffraction profi les of the PC cellulose hydrogel, DC cellulose hydrogel, and CC cellulose hydrogel prepared using a) different ECH-to-AGU molar ratios and b) different concentrations of aqueous ethanol. The above errors do not affect the scientific conclusions drawn from the work. The authors apologize for any inconvenience or misunderstanding that these errors may have caused.

Crystallinity of regenerated cellulose from [Bmim]Cl dependent on the hydrogen bond acidity/basicity of anti-solvents

“…Otherwise, cellulose can be regenerated to fabricate cellulose-based materials 12 with excellent properties by adding anti-solvents such as water, acetone and compressed carbon dioxide. 13 It is important to point out that the properties of regenerated cellulose varied upon changing the regeneration conditions.…”

Multifunctional Nanoengineered Hydrogels Consisting of Black Phosphorus Nanosheets Upregulate Bone Formation

“…However, ionically crosslinked DN hydrogels might have limited long‐term stability due to loss of ionic coordination under physiological conditions when used as tissue scaffolds. On the other hand, covalent crosslinking bonds between different networks in hydrogels led to higher strength but brittle behaviors 3b,5. Given these findings, we hypothesized that constructing multiple covalent and physical bonds between the natural polymer and synthetic polymer networks may be superior for controlling the tunable mechanical properties of bioengineered DN hydrogels.…”

Robust hydrogel of regenerated cellulose by chemical crosslinking coupled with polyacrylamide network

“…There is a great challenge on the development of mechanically strong and tough cellulose hydrogels. Several approaches have been developed to improve the mechanical properties of traditional hydrogels, including nanocomposite hydrogels, ionically crosslinked hydrogels, hydrogen bonding hydrogels, topological structure hydrogels, and double network (DN) hydrogels . Among these hydrogels, DN hydrogels consisting of the primary dense and brittle network and the secondary dilute and flexible network, which are typically synthesized through a two‐step sequential free‐radical polymerization, are considered as the strongest soft materials .…”

“…Actually, RC hydrogels can be easily formed via physical or chemical crosslinking. More importantly, the structure and properties of chemically crosslinked RC hydrogels can be adjusted by controlling the content of crosslinking agent …”