Scientific Reports
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2024
·Vol. 14
·期 1
·1-11
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IF 3.8
Xu Feng,Jin Hang,Wu Huiquan,Jiang Acan,Qiu Bin,Liu Lingling,Gao Qiang,Lin Bin,Kong Weiwei,Chen Songyue,Sun Daoheng
Hydrogels are extensively explored as biomaterials for tissue scaffolds, and their controlled fabrication has been the subject of wide investigation. However, the tedious mechanical property adjusting process through formula control hindered their application for diverse tissue scaffolds. To overcome this limitation, we proposed a two-step process to realize simple adjustment of mechanical modulus over a broad range, by combining digital light processing (DLP) and post-processing steps. UV-curable hydrogels (polyacrylamide-alginate) are 3D printed via DLP, with the ability to create complex 3D patterns. Subsequent post-processing with Fe 3+ ions bath induces secondary crosslinking of hydrogel scaffolds, tuning the modulus as required through soaking in solutions with different Fe 3+ concentrations. This innovative two-step process offers high-precision (10 μm) and broad modulus adjusting capability (15.8–345 kPa), covering a broad range of tissues in the human body. As a practical demonstration, hydrogel scaffolds with tissue-mimicking patterns were printed for cultivating cardiac tissue and vascular scaffolds, which can effectively support tissue growth and induce tissue morphologies.
研究领域:
生物材料学
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组织工程学
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产品关联
DOI
PubMed
高影响因子
POLYMER
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2024
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IF 4.1
Haihui Liu,Guoting Li,Jingguang Zhang,Ziheng Sang,Ze Chen,Qiang Xu,Shuai Wang,Xingxiang Zhang
Polyurethane has emerged as an excellent potential candidate for shape memory materials due to its microphase-separated structure with alternately connected hard and soft segments. In this study, SMPU of different molecular weights were prepared with poly(caprolactone) diol (PCL), hexamethylene diisocyanate (HDI), 1, 6-hexanediamine (HMDA), trimethylolpropane tris (3-mercaptopropionate) (TMPMP), and Dilauroyl peroxide (LPO). LPO as a chemical cross-linking agent can induce secondary cross-linking, which leads to the formation of a strong and stable secondary cross-linking network, and this network can be transformed into a supplier of internal stresses, so that the network exhibits excellent bidirectional shape memory effects. The effects of thermal and shape memory properties were investigated by TGA, DSC and DMA tests, the phase transition temperature of the SMPU was studied and the shape recovery process was recorded. The results show that the SMPU synthesized by PCL 2k has good shape memory performance, with a reversible strain of up to 16.1 %, and the average shape fixation and recovery rates of 92.83 % and 99.98 %, respectively, with good shape memory performance, which is expected to show a wide range of application prospects and value of use in the fields of smart fabrics, biomedicine, sensing drive, aerospace and so on.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 6
·1165
·
IF 3.352
Erdong Yao,Bojun Li
This paper presents a low-cost, high-temperature-resistant and high-strength polyacrylamide gel system formed by secondary cross-linking. The gel system (named JM186) used phenolic resin and organic zirconium as cross-linking agents, and the performance of the gel system was systematically evaluated under high temperature. The gel properties studied include: gel formation time, gel strength, thermal stability, sand-filled pipe sealing efficiency, and its microstructure. The concentration of polyacrylamide in JM186 gel system was as low as 0.3%, which can control the gelling time in a range of 1–9 h by adjusting the ratio of two cross-linking agents. It can resist temperature up to 120 °C without dehydration, and its highest gel strength can reach H grade. The modulus of elasticity (G’) and viscosity (G”) can reach 32.33 Pa and 3.25 Pa, respectively. DSC (differential scanning calorimetry) test indicated that the temperature of structural failure for this composite gel is 310.5 °C. The average sealing efficiency of the gel is 96.03% in sand-filled pipes. Finally, the gel microstructure was observed by cryo-scanning electron microscopy (Cryo-SEM). It was found that the gel system by secondary cross-linking has a dense and thickened network structure compared with the single cross-linker gel system. The gel is cross-linked by both the coordination bond and covalent bond, and the two cross-linking agents have a synergistic effect. This is the reason why the secondary cross-link gel system is better than the single-cross-linker gel system.
研究领域:
材料科学
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石油工程
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化学工程
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DOI
高影响因子
Geoenergy Science and Engineering
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2025
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IF 4.6
Chaozong Yan,Zhifeng Luo,Li Shang,Weihua Chen,Fei Liu,Shouwei Zhou
To enhance the hydrogel performance under ultra-high temperature conditions, this study developed a novel β-cyclodextrin composite crosslinker (β-CCs) through the synthesis of carbon dots, mono-(6-amino-6-deoxy)-β-cyclodextrin (β-CD), and zirconium oxychloride octahydrate. The β-CCs was subsequently employed to crosslink acrylamide-acrylic acid copolymers (P(AM-AA)), yielding the β-CCs-P(AM-AA) hydrogel. Systematic investigations revealed exceptional thermal stability of the hydrogel, maintaining a viscosity of 122 mPa·s after 147 min of shear treatment at 200°C. Comparative analysis with CDs-crosslink P(AM-AA) hydrogel (without β-CD modification) demonstrated a distinctive secondary crosslinking phenomenon occurring specifically at 100°C in β-CCs-P(AM-AA), attributed to the unique β-CD-zirconium ion chelation mechanism. Rheological characterization at elevated temperatures (80-100°C) combined with post-treatment TEM analysis confirmed that the secondary crosslinking at approximately 100°C significantly reinforced the hydrogel network integrity. This temperature-responsive crosslinking behavior substantially improved the hydrogel's structural stability under extreme thermal conditions. The developed β-CCs-P(AM-AA) hydrogel presents a groundbreaking strategy for designing adaptive polymeric materials capable of functioning in extreme temperature environments, offering new perspectives for high-temperature applications in fields such as enhanced oil recovery and geothermal engineering.
研究领域:
材料科学
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高分子科学
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石油工程
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Liuzhou Chen,Kun Wu,Mohe Zhang,Nengsheng Liu,Chenxi Li,Jiangzhou Qin,Quanlin Zhao,Zhengfang Ye
A novel chitosan resin microsphere (CDCR) adsorbent, which was synthesized by secondary crosslinking and carbon disulfide modification, and was evaluated for its efficacy in recovering palladium from wastewater. The physicochemical properties and adsorption mechanism of CDCR were determined using scanning electron microscope energy dispersive system (SEM-EDS), fourier-transform infrared spectroscopy (FTIR), simultaneous thermal analyzer (TG-DSC), X-ray photoelectron spectroscopy (XPS), etc. The experimental results showed that its saturated adsorption capacity was about 204.34 mg/g. And the adsorption process of Pd(Ⅱ) was found to be in accordance with the pseudo-second-order kinetic model and the Freundlich model. Thermodynamic analysis indicated that the reaction between CDCR and Pd(Ⅱ) was a spontaneous endothermic process. CDCR showed good reusability, maintaining a Pd(Ⅱ) removal efficiency of 99.99% after eight adsorption–desorption cycles. In the multi-ion coexistence solution, CDCR also exhibited excellent selectivity towards Pd(Ⅱ) adsorption. Furthermore, the adsorption of Pd(Ⅱ) by CDCR was primarily attributed to electrostatic interaction with protonated amine groups and complexation with sulfur groups.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）