A silicone elastomer with optimized and tunable mechanical strength and self-healing ability based on strong and weak coordination bonds

2020 ◽  
Vol 11 (24) ◽  
pp. 4047-4057 ◽  
Author(s):  
Ming Tian ◽  
Hongli Zuo ◽  
Jie Wang ◽  
Nanying Ning ◽  
Bing Yu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Mechanical Strength ◽  
Silicone Elastomer ◽  
Self Healing ◽  
Coordination Bonds ◽  
Weak Coordination

A self-healable silicone elastomer is fabricated based on the synergistic effect of strong and weak coordination bonds.

scholarly journals A Highly Stretchable, Tough, Fast Self-Healing Hydrogel Based on Peptide–Metal Ion Coordination

Biomimetics ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 36 ◽  
Author(s):  
Liang Zeng ◽  
Mingming Song ◽  
Jie Gu ◽  
Zhengyu Xu ◽  
Bin Xue ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Coordination Number ◽  
Metal Ion ◽  
Mechanical Performance ◽  
Dynamic Properties ◽  
Healing Time ◽  
Metal Coordination ◽  
Self Healing ◽  
Number Of Binding Sites ◽  
Coordination Bonds

Metal coordination bonds are widely used as the dynamic cross-linkers to construct self-healing hydrogels. However, it remains challenging to independently improve the toughness of metal coordinated hydrogels without affecting the stretchability and self-healing properties, as all these features are directly correlated with the dynamic properties of the same metal coordination bonds. In this work, using histidine–Zn2+ binding as an example, we show that the coordination number (the number of binding sites in each cross-linking ligand) is an important parameter for the mechanical strength of the hydrogels. By increasing the coordination number of the binding site, the mechanical strength of the hydrogels can be greatly improved without sacrificing the stretchability and self-healing properties. By adjusting the peptide and Zn2+ concentrations, the hydrogels can achieve a set of demanding mechanical features, including the Young’s modulus of 7–123 kPa, fracture strain of 434–781%, toughness of 630–1350 kJ m−3, and self-healing time of ~1 h. We anticipate the engineered hydrogels can find broad applications in a variety of biomedical fields. Moreover, the concept of improving the mechanical strength of metal coordinated hydrogels by tuning the coordination number may inspire the design of other dynamically cross-linked hydrogels with further improved mechanical performance.

A readily self-healing and recyclable silicone elastomer via boron–nitrogen noncovalent crosslinking

2018 ◽  
Vol 42 (23) ◽  
pp. 18517-18520 ◽  
Author(s):  
Jinfeng Cao ◽  
Dongdong Han ◽  
Hang Lu ◽  
Peng Zhang ◽  
Shengyu Feng
Keyword(s):  
Michael Reaction ◽  
Silicone Elastomer ◽  
Self Healing ◽  
One Pot ◽  
Coordination Bonds ◽  
Boron Nitrogen

A self-healing silicone elastomer was synthesized via a one-pot and noncatalytic aza-Michael reaction because boron–nitrogen coordination bonds form reversible crosslinking points.

scholarly journals Dynamic Nanohybrid-Polysaccharide Hydrogels for Soft Wearable Strain Sensing

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3574
Author(s):  
Pejman Heidarian ◽  
Hossein Yousefi ◽  
Akif Kaynak ◽  
Mariana Paulino ◽  
Saleh Gharaie ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Strain Sensors ◽  
Self Healing ◽  
Nano Materials ◽  
Strain Sensing ◽  
Ferric Ions ◽  
Research Activity ◽  
Adhesion Properties ◽  
High Mechanical Strength ◽  
The Moment

Electroconductive hydrogels with stimuli-free self-healing and self-recovery (SELF) properties and high mechanical strength for wearable strain sensors is an area of intensive research activity at the moment. Most electroconductive hydrogels, however, consist of static bonds for mechanical strength and dynamic bonds for SELF performance, presenting a challenge to improve both properties into one single hydrogel. An alternative strategy to successfully incorporate both properties into one system is via the use of stiff or rigid, yet dynamic nano-materials. In this work, a nano-hybrid modifier derived from nano-chitin coated with ferric ions and tannic acid (TA/Fe@ChNFs) is blended into a starch/polyvinyl alcohol/polyacrylic acid (St/PVA/PAA) hydrogel. It is hypothesized that the TA/Fe@ChNFs nanohybrid imparts both mechanical strength and stimuli-free SELF properties to the hydrogel via dynamic catecholato-metal coordination bonds. Additionally, the catechol groups of TA provide mussel-inspired adhesion properties to the hydrogel. Due to its electroconductivity, toughness, stimuli-free SELF properties, and self-adhesiveness, a prototype soft wearable strain sensor is created using this hydrogel and subsequently tested.

Luminescent Polymorphic Aggregates of Trinuclear Cu(I)-pyrazolate Tuned by Intertrimeric Cu···NPy Weak Coordination Bonds

2021 ◽  
Author(s):  
Shun-Ze Zhan ◽  
Wei Chen ◽  
Ji Zheng ◽  
Seik Weng Ng ◽  
Dan Li
Keyword(s):  
Coordination Bonds ◽  
Weak Coordination

Five luminescent polymorphic aggregates of trinuclear Cu(I)-pyrazolate, namely [anti-Cu3L3]2 (1), [syn-Cu3L3·C2H5OH]2 (2), [anti-Cu3L3·C2H5OH]n (3), [anti-Cu3L3·0.5C7H8]n (4) and [syn-Cu3L3·C8H10]n (5) (HL = 4-(pyridin-4-ylthio)-3,5-dimethyl-1H-pyrazole), were reported. The trimeric Cu3L3 fragments present syn-...

Self-Healable Silicone Elastomer Based on the Synergistic Effect of the Coordination and Ionic Bonds

2021 ◽  
Author(s):  
Shui Yu ◽  
Hongli Zuo ◽  
Xiaowei Xu ◽  
Nanying Ning ◽  
Bing Yu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Silicone Elastomer ◽  
Ionic Bonds

Self-healing, Highly Elastic and Amphiphilic Silicone-based Polyurethane for Antifouling Coatings

2021 ◽  
Author(s):  
Xiaobin Lin ◽  
Qingyi Xie ◽  
Chunfeng Ma ◽  
Guangzhao Zhang
Keyword(s):  
Mechanical Properties ◽  
Silicone Elastomer ◽  
Self Healing ◽  
Fouling Resistance ◽  
The Poor ◽  
Antifouling Coatings ◽  
Fouling Release

Silicone elastomer coatings have attracted increasing attention owing to its eco-friendly nature, excellent fouling release ability and drag-reducing property. However, the poor mechanical properties and lack of fouling resistance limits...

Non-covalent assembly of a super-tough, highly stretchable and environmentally adaptable self-healing material inspired by nacre

2021 ◽  
Vol 9 (36) ◽  
pp. 20737-20747
Author(s):  
Xiaobo Zhu ◽  
Wenru Zheng ◽  
Haichao Zhao ◽  
Liping Wang
Keyword(s):  
Mechanical Strength ◽  
Self Healing ◽  
Highly Stretchable

Inspired by nacre, a super-tough self-healing material with a reverse nacre structure and interwoven network was prepared, which solved the contradiction between fast self-healing ability and good mechanical strength of traditional PU materials.

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