NIR-Triggered Rapid Shape Memory PAM–GO–Gelatin Hydrogels with High Mechanical Strength

Huang, Jiahe; Zhao, Lei; Wang, Tao; Sun, Weixiang; Tong, Zhen

doi:10.1021/acsami.6b00867

Cited by 135 publications

(85 citation statements)

References 48 publications

(79 reference statements)

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“…In the frequency sweep measurement (Figure S6c, Supporting Information), The G ′ at the same frequency of DN hydrogels is always larger than that of SN hydrogel over a frequency range from 0.01 to 100 Hz at 30 °C, and the G ′ of both DN and SN hydrogels are almost independent of frequency change in high‐frequency region. This result agrees well with that reported in a previous study …”

Section: Resultssupporting

confidence: 94%

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

Feng

Zuo

Gao

et al. 2018

Macromol. Rapid Commun.

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A versatile double-network (DN) hydrogel with two noncovalent crosslinked networks is synthesized by multiple hydrogen bonding (H-bonding) interactions. The DN hydrogels are synthesized via a heating-cooling photopolymerization process by adding all reactants of agar, N-acryloyl glycinamide (NAGA) and N-benzylacrylamide (NBAA) monomers, UV initiators to a single water pot. Poly(N-acryloyl glycinamide-co-N-benzyl acrylamide) (P(NAGA-co-NBAA)) with a triple amide in one side group is synthesized via UV-light polymerization between NAGA and NBAA, forming a strong intermolecular H-bonding network. Meanwhile, the intramolecular H-bonding network is formed between P(NAGA-co-NBAA) and agars. The sol-gel phase transition of agars at 86 °C generates the molecular entanglement network. Such a double network enables the hydrogel high self-healing efficiency (about 95%), good shape memory ability, and high mechanical strength (1.1 MPa). Additionally, the DN hydrogel is completely crosslinked by multiple hydrogen bonds (H-bonds) and the physical crosslinking of agar without extra potential toxic chemical crosslinker. The DN hydrogels find extensive applications in the biomedical materials due to their excellent biocompatibility.

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Section: Resultssupporting

confidence: 94%

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

Feng

Zuo

Gao

et al. 2018

Macromol. Rapid Commun.

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“…Huang et al proposed a one‐pot method to produce a double network containing both permanent and temporary cross‐linking structures through chemically cross‐linked polyacrylamide (PAM) and physically cross‐linked gelatin. Graphene oxide (GO) was introduced into the hydrogel matrix to serve as energy convertor to convert NIR irradiation to thermal energy . Although GO has been widely used as near‐infrared light energy convertor, the dispersion problem and the interaction with the matrix are the bottlenecks that limit its application .…”

Section: Introductionmentioning

confidence: 99%

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Yang

Wang

Fei

et al. 2017

Macromol. Rapid Commun.

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following freezing/thawing under strain, which induces the second cross-linking due to crystallization of PVA chains. The reversible formation and melting of PVA crystallites enables the temporary shape fixation and recovery. Chen et al. also constructed a shape memory hydrogel based on stronger and weaker H-bonding by introducing tannic acid (TA) into the PVA hydrogel networks. The stronger multiple H-bonding between PVA chains and TA acts as the permanent cross-links and the weaker H-bonding among PVA chains works as the temporary cross-links. [20] However, the shape memory and selfhealing PVA hydrogel still encounters some challenges. The first is how to control the SM&SH process spatially and temporally by appropriate stimulus. Most SM&SH hydrogels were thermally activated, but one disadvantage is that the direct heating will lead to temperature rising of the entire material. [21,22] Other stimulating means such as air, water, and pH can also trigger the shape recovery, but those stimuli are limited in practical applications. [23][24][25][26] In contrast, the remote stimulations such as ultrasound and light are very easy to achieve local focus and quantitative stimulation. [27,28] Previously we firstly proposed the use of therapeutic ultrasound to trigger the shape memory of a PVA hydrogel containing a small amount of melamine. [19] In this study, we will try to use near-infrared (NIR) to trigger the SM&SH process by employing the photothermal effect of polydopamine. As a safe and noncontact stimulus, NIR light is widely used in the field of biomedicine. Huang et al. proposed a one-pot method to produce a double network containing both permanent and temporary cross-linking structures through chemically cross-linked polyacrylamide (PAM) and physically cross-linked gelatin. Graphene oxide (GO) was introduced into the hydrogel matrix to serve as energy convertor to convert NIR irradiation to thermal energy. [29] Although GO has been widely used as nearinfrared light energy convertor, the dispersion problem and the interaction with the matrix are the bottlenecks that limit its application. [30,31] The second challenge is the contradiction between mechanical strength and self-healing performance. In most cases, the hydrogel with self-healing function has a lower mechanical strength, which in practice means no useful in many circumstances. There are some approaches to improve the mechanical properties of hydrogels, such as introducing physical and chemical cross-linkers or reinforced fillers. [32][33][34] HydrogelsThis study focuses on developing a facile approach to prepare biocompatible poly(vinyl alcohol) (PVA) composite hydrogels containing polydopamine particles (PDAPs) with ultrafast near-infrared (NIR) light-triggered shape memory and self-healing capability. The PVA-PDAPs composite hydrogels with excellent mechanical properties can be achieved after freezing/thawing treatment, and the formation of physically cross-linked networks from the hydrogen bonding (H-bonding) between PVA and PDAPs. Due to the exce...

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“…b) The shape recovery of the PAM‐Gelatin‐MBA hydrogel without GO from temporary shape (b‐1) with NIR irradiation for 10 s (b‐2), 60 s (b‐3), and 180 s (b‐4), respectively. Reproduced with permission . Copyright 2016, ACS.…”

Section: Properties and Applications Of Polymer–graphene Hydrogelsmentioning

confidence: 99%

“…Reproduced with permission. [94] Copyright 2016, ACS. www.advancedsciencenews.com www.mme-journal.de amount of GO in the hydrogels (≤1.5 mg mL −1 ) played a key role in NIR energy absorption and transformation into thermal energy.…”

Section: Shape Memory Propertiesmentioning

confidence: 99%

Recent Progress of Graphene‐Containing Polymer Hydrogels: Preparations, Properties, and Applications

Pan

Liu

Gai

2017

Macro Materials & Eng

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Polymer hydrogels have attracted much attention due to their mechanical, biological, and physicochemical properties. Incorporation of functional material enlarges their applications. Graphene, as a promising additive, has received great attention due to its large specific surface area, ultrahigh conductivity, strong antioxidant, thermal stability, high thermal conductivity, and good mechanical properties. In this brief review, graphene‐containing polymer hydrogels with special properties are summarized including their preparations, properties, and applications. In addition, future perspectives of polymer hydrogels containing graphene are briefly discussed.

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NIR-Triggered Rapid Shape Memory PAM–GO–Gelatin Hydrogels with High Mechanical Strength

Cited by 135 publications

References 48 publications

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

A Robust, Self‐Healable, and Shape Memory Supramolecular Hydrogel by Multiple Hydrogen Bonding Interactions

Polydopamine Particles Reinforced Poly(vinyl alcohol) Hydrogel with NIR Light Triggered Shape Memory and Self‐Healing Capability

Recent Progress of Graphene‐Containing Polymer Hydrogels: Preparations, Properties, and Applications

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