Advanced Science
·
2023
·Vol. 10
·期 27
·2303315
·
IF 15.1
Zhi Zhao,Yurong Li,Haibin Wang,Yupeng Shan,Xuemei Liu,Mengfei Wu,Xinping Zhang,Xiaoyan Song
Owing to high water content and homogeneous texture, conventional hydrogels hardly reach satisfactory mechanical performance. Tensile-resistant groups and structural heterogeneity are employed to fabricate tough hydrogels. However, those techniques significantly increase the complexity and cost of material synthesis, and have only limited applicability. Here, it is shown that ultra-tough hydrogels can be obtained via a unique hierarchical architecture composed of chemically coupled self-assembly units. The associative energy dissipation among them may be rationally engineered to yield libraries of tough gels with self-healing capability. Tunable tensile strength, fracture strain, and toughness of up to 19.6 MPa, 20 000%, and 135.7 MJ cm⁻ 3 are achieved, all of which exceed the best known records. The results demonstrate a universal strategy to prepare desired ultra-tough hydrogels in predictable and controllable manners.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2024
·
IF 9.6
Zhang Xue-Hui,Yuan Hai-Xiang,Huang Fei,Wang Hang,Yang Bin,Zeng Long-Fei,Li Xin-Hao,Huang Ya-Jian,Ahmad Tahir
Designing heterogeneous grain structure (HGS) has been proven to be an effective strategy for overcoming the strength-plasticity dilemma in copper and copper alloys. However, the construction of HGS in dispersion-strengthened copper (DSC) for enhancing strength-plasticity synergy remains challenging. Here, we proposed a novel method, multistep ball milling and reduction process followed by spark plasma sintering, to prepare DSC with an HGS to ameliorate the strength-plasticity dilemma in DSC. Micron- and nano-CuO and nano-Y 2 O 3 powders were chosen as raw materials in this new method. The Cu-7 vol% Y 2 O 3 composite, exhibiting a compressive yield strength of 438 MPa and a failure strain of 46.3%, exhibits a superior strength-plasticity tradeoff in comparison with other DSC materials. Systematic experiments indicate that the back-stress at the heterointerfaces between coarse grains and fine grains maybe not only raise the yield strength of Cu-Y 2 O 3 composite, but also significantly enhance the strain hardening to increase the plasticity of the material. The new HGS designing route in this study offers a feasible pathway to develop DSC with a remarkable enhancement in strength and plasticity. Graphical abstract
研究领域:
材料科学
·
冶金学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Shuang Liu,Zhijie Zhang,Quan Chen,Yumi Matsumiya,Hiroshi Watanabe
In this study, we examined the structure, linear viscoelastic (LVE) properties, and nonlinear shear and elongational properties of unentangled telechelic ionomers based on either sodium carboxylate or sodium sulfonate groups, coded as Mn-COONa and Mn-SO3Na, with the number-average molecular weight Mn varying from 5 to 16 kg mol–1. A combination of X-ray scattering and LVE data revealed that both types of ionomers form networks sustained by “superbridges” transiently cross-linked by salt aggregates. The aggregates were found to be more stabilized in the Mn-SO3Na ionomers than in the Mn-COONa ionomers. In addition, the X-ray scattering and LVE data suggested that the inner and end aggregates of the superbridge are equally stabilized in Mn-SO3Na, while the end aggregates are more stable in Mn-COONa. This difference in the aggregate stability in the two series of ionomers was found to have a significant effect on nonlinear rheology; namely, under the shear or elongational flow fields with the Weissenberg number Wi > 1, Mn-COONa showed a larger strain on the stress overshoot compared to Mn-SO3Na. This result suggested that the Mn-COONa ionomers can better adjust the network under flow before the overshoot. After the overshoot, the weaker pseudo-yielding and higher fracture strains were attained for Mn-COONa, suggesting that the associated network can be reconstructed more easily for Mn-COONa. All these features are attributable to a nonuniform distribution of the salt aggregate size and superbridge length of Mn-COONa, which enables more efficient energy dissipation under strong flow through fast rearrangement of the network.
研究领域:
高分子科学
·
流变学
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wenkang Liu,Yiwei Li,Changren Zhou,Tao Yu
ABSTRACT The treatment of vertebral compression fractures of the spinal necessitates the use of injectable bone repair materials with the adaptive modulus of elasticity. Currently, newly developed injectable self-curing materials for minimally invasive surgery are primarily categorized into calcium phosphate and calcium silicate systems, both of which exhibit excellent biocompatibility. However, calcium phosphate bone cement lacks adequate mechanical properties and the stress does not match between bone and material. Calcium silicate cement has a long curing time, low mechanical strength, and high alkalinity. These deficiencies render them inadequate for meeting clinical requirements. Therefore, we incorporated inorganic disodium phosphate, organic polyvinyl alcohol, and solid component cerium oxide into the matrix phase of tricalcium silicate bone cement to establish a ternary self-curing hydration reinforcement system and produced an organic-inorganic composite injectable bone cement. Even though the composite bone cement has a longer setting time, it exhibited high compressive strength (61.9Mpa) and fracture strain (7.88%), demonstrating excellent mechanical properties. Furthermore, it also demonstrates good injectable properties (86%), anti-collapse properties, good biological activity, and outstanding antibacterial properties. The composite bone cement has great potential to develop a new injectable self-curing material to replace PMMA bone cement in clinical vertebral compression fractures.
研究领域:
材料科学
·
骨科手术
·
生物材料
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）