On‐Site Surface Coordination Complexation via Mechanochemistry for Versatile Metal–Phenolic Networks Films

Abstract

co-workers reported a one-step method to obtain the uniform tannic acid-Fe (TA-Fe) films (11.9 ± 1.2 nm) by changing the pH value of solution. [2] Similar to the assembly of TA-Fe films, 18 different metal ions have been selected to design and prepare MPNs multifunctional capsules. [3] Additionally, a large variety of superstructures based on the polyphenol surface functionalization have been obtained through cross-linking interaction. [4] Such studies show that a design based on coordination bond between polyphenols and various metal ions can provide a platform to prepare multifunctional materials. However, the requirements of synthesis of MPNs are a wet environment, [2] which restricts their widespread applications of monomers with no or poor solubility in solvents. [5] The development of a solvent-free method to prepare MPNs films with tunable properties is an urgent requirement. Mechanochemistry, a green and sustainable technology, [6] is now emerging as an environmentally friendly alternative to conventional solution-based approach in the fields of porous carbon materials, [7] organic reactions, [8] nanomaterials, [9] and metal-organic complexes. [10] Dai and co-workers synthesized The development of functional metal-phenolic networks (MPNs) films by a simple and green strategy on metallic plane substrates for surface modification is a big challenge. Herein, tribochemistry, as an effective and robust method to prepare MPNs films with versatile applications and controllable thickness (≈1.5 nm to 2.2 µm) by surface coordination complexation derived from tannic acid (TA) and metal oxides or ions (M) on plane substrates, is reported. The mechanism of the formation of TA-M films is investigated in detail, showing that films are constructed by two-layer structures. At the bottom of films, the chelation of TA active moieties and M is triggered by friction, facilitating the coating growth and reducing the friction coefficient.There is a downward trend in the concentration of M with the thickness of films increasing, which is attributed to the diffusion of metal ions. As a result, the dominant structure of films changes into the hydrogen bonding or π-π stacking interaction among oligomers derived from coupling of the TA active moieties. Such facile surface modification strategy can broaden in situ mechanochemical synthesis of functional layers and open a promising route for the design of patterning, antifouling, and controlled release coatings.

Anti-oxidant anti-inflammatory and antibacterial tannin-crosslinked citrate-based mussel-inspired bioadhesives facilitate scarless wound healing

“…Additionally, TA is a low-cost material approved by the U.S. Food and Drug Administration (FDA) as a safe and biocompatible component for medical device development, enhancing its clinical potential [ 35 ]. Leveraging its large number of carbonyl and phenolic functional groups, TA is able to bond to various polymers such as poly(ethylene glycol) (PEG) [ 36 ], chitosan (CS) [ 37 ], silk fibroin (SF) [ 38 ], and thioctic acid [ 14 ] through multiple reaction pathways, including electrostatic interactions, hydrogen bonding, hydrophobic interactions and covalent bonding [ 39 , 40 ]. Herein, we translated the impressive bonding ability of TA into development of a series of self-healing, low swelling, and tissue-adhesive citric acid-based bioadhesives via simple physical mixing of TA with previously developed iCMBA prepolymers.…”

Colloidal Surface Engineering: Growth of Layered Double Hydroxides with Intrinsic Oxidase‐Mimicking Activities to Fight Against Bacterial Infection in Wound Healing

“…[8][9][10][11][12][13][14] Recently, surface coatings based on metal phenolic networks are well-developed benefiting from the rapid formation coordination bond between the polyphenol and the transition metal ions. [15,16] Although the aforementioned surface coating methods are robust, it is still a challenge to develop a robust method to coat colloidal nanoparticles with other materials, in particular with specific enzyme mimicking properties.…”

Strategic Advances in Spatiotemporal Control of Bioinspired Phenolic Chemistries in Materials Science

“…[179] More recently, Kang et al found that thick MPN films can be prepared in a solvent-free manner via tribochemistry to promise mechanosynthesis. [180] The film thickness was tailorable from 1.5 nm to 2.2 µm by simply varying the friction parameters and reaction time. Further investigations showed that these films harbored a gradient bilayer structure.…”