Ion responsiveness of polyacrylamide/sodium alginate (PAM/SA) shape memory hydrogel

Wang, Minying; Luo, Lei; Fu, Lihua; Yang, Hua

doi:10.1080/1539445x.2019.1618325

Cited by 31 publications

(20 citation statements)

References 34 publications

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“…Specifically, the maximum stress of pristine hydrogel P without fillers is 47 kPa at 760% strain, while those of composite hydrogels P‐LMGO1, P‐LMGO2, P‐LMGO3, and P‐LMGO4 are 143 kPa at 4067% strain, 160 kPa at 2183% strain, 303 kPa at 1240% strain, and 108 kPa at 695% strain, respectively. The mechanical performance of P‐LMGO3 not only exceeds LM‐composite hydrogels, such as LM‐PAM, [ 24 ] LM‐poly(ethylene glycol) diacrylate, [ 23 ] LM‐poly(vinyl alcohol), [ 42 ] but also LM elastomer, [ 22 ] hybrid GO hydrogel, [ 43,44 ] MXene hydrogel, [ 45,46 ] as well as metal ion crosslinking hydrogels [ 28,47,48 ] (Figure 2f). Corresponding Young's modulus increases with GO/LM ratio until GO/LM = 1/10 (P‐LMGO3), and the highest value is 80 kPa (P‐LMGO3), which is four times more than that of P (18 kPa), as shown in Figure S13 (Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Encapsulating Liquid Metal to Toughen Hydrogel

Zhuo

et al. 2021

Adv Funct Materials

100

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Stretchable and tough hydrogels are highly required for various flexible devices. Liquid metal (LM) emerges as an attractive applicant in preparing functional hydrogels due to its unique features. However, the high fluidity of LM and incompatibility between LM and polymer matrix make it hard to fabricate tough hydrogels. Herein, inspired by the function of ligaments in biological structure, graphene oxide (GO) nanosheets are introduced to encapsulate LM droplets. GO nanosheets form strong interaction with both LM and polymer matrix to create a stable shell that prevents LM droplet from fracture and exudation to polymer network. The flexible LM/GO core–shell microstructure avoids phase separation and produces a tough hydrogel with stress of high up to 303 kPa at 1240% elongation. It also shows notch insensitivity and strong adhesion to various surfaces. This study opens the possibility of using LM in stretchable and tough hydrogels.

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Section: Resultsmentioning

confidence: 99%

Graphene Oxide Encapsulating Liquid Metal to Toughen Hydrogel

Zhuo

et al. 2021

Adv Funct Materials

100

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“…The chemical structures and interactions of alginate‐P(SBMA‐ co ‐AAm) hydrogels were analyzed by FTIR and XRD (Figure 2(f,g)). In the FTIR spectrum of alginate, 13,24,25 the peak at 3365 and 1092 cm −1 were assigned to the stretching vibration of OH and COC, respectively. The peaks at 1613 and 1416 cm −1 were corresponding to the symmetric and asymmetric stretching vibration of carboxylate salt group.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the compatibility with hydrophilic polymers, (semi‐) interpenetrating polymer networks [(semi‐) IPN] or double networks hydrogels are frequently fabricated using alginate as matrices, showing excellent mechanical properties. An alginate/PAAm hydrogel fabricated by Yang et al had a tensile strength of 0.11 MPa at the failure strain of 1173% 13 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of alginate‐P(SBMA‐co‐AAm) hydrogels with ultrastretchability, strain sensitivity, self‐adhesiveness, biocompatibility, and self‐cleaning function for strain sensors

Jin

Jiang

Qiao

et al. 2020

J of Applied Polymer Sci

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Conductive hydrogels have attracted a myriad of interest due to their potential applications for human motion monitoring, personal healthcare diagnosis and so forth. However, fabrication of hydrogel-based strain sensors integrating with ultrastretchability, adhesiveness, strain sensitivity, biocompatibility, and self-cleaning function is still a challenge. Herein, a new type of semiinterpenetrating multifunctional hydrogels, which integrated all above practical features magically were prepared via a facile one-pot in-situ radical copolymerization method. Thereinto, [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide (SBMA) and acrylamide (AAm) copolymers cross-linked by N,N 0-Methylenebisacrylamide (MBAA) served as the soft and functional matrix, whereas alginate was employed as the enhanced component. The transparent zwitterionic hydrogels had a max elongation and ionic conductivity of 1353% and 0.15 S/m, respectively. They could adhere onto various surfaces, including steel, glass, skin, and rubber. The repeatable adhesiveness, linear strain sensitivity within 0%-250% tensile strain and 0%-30% compressive strain provided remarkable working range and using stability. What's more notable was that the biocompatibility and self-cleaning function tested by MTT, live/ dead assay, allergy patch tests, and plate colony-counting method imparted great possibility of practical application for strain sensors to hydrogels from a biological point of view.

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“…For this reason, an increasing interest in this material has been noted in the number of publications, primarily in the last decade. [223][224][225][226][227][228][229][230][231][232][233][234] Fe 3+ -Alg can be synthesized from nm to mm scale with different arrangements (e.g., beads, films, electrodeposited layers). In addition, the hydrogel can be degraded by different mechanisms providing the material with stimuli-responsive and patterning capabilities.…”

Section: Discussionmentioning

confidence: 99%