Journal of Building Engineering
·
2024
·
IF 6.7
Jinglong Huang,Yilian Li,Yunhua Zhang
In order to improve the carbonation properties of steel slag, the carbonation reaction process of steel slag and the formation of carbonation products were regulated by the interaction between multiple hydroxyl groups within β-cyclodextrin (β-CD) molecule and calcium ions leached from steel slag. Through a meticulous experimental design, varying contents of β-CD, from 0.0 % to 5.0 %, were mixed with steel slag to investigate their impact on carbonation kinetics, mechanical strength, and microstructural evolution. The results indicate that β-CD significantly accelerates the carbonation process of steel slag, with a particular boost to the carbonation of β-dicalcium silicate (β-C 2 S), a key mineral contributing to the carbonation activity. At an optimal β-CD concentration of 2.5 %, the compressive strength of the treated slag reached a peak of 138.5 MPa, marking a 13.4 % improvement over the control sample. Similarly, the CO 2 uptake was optimized at 17.9 %, increasing by 21.8 %. Mechanism analysis reveals that β-CD not only facilitates carbonation but also refines the resulting carbonation products, leading to a denser microstructure and enhanced mechanical properties. However, at a β-CD content of 5.0 %, the carbonation process was hindered by excessive viscosity. These pivotal findings propose an innovative strategy to augment the efficiency of carbonation and the inherent material properties of steel slag, thereby fostering a more sustainable approach to the utilization of industrial byproducts.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ling Zhu,Yuqian Zhang,Shuai Chen,Zecheng Lin,Yuchen Zhang,Xiaowen Xie,Yongluo Qiao
Organic electrochromic conducting polymers (CPs) are at the forefront of flexible and ultra-thin display electronics. Solution processable poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) exhibits excellent electrical and electrochemical behavior in line with great processability, stability, and other promising properties. However, their uses are limited by the weak mechanical properties, wet instability, as well as inevitable conflicts among different functionalities and structural characteristics, etc. In this study, we designed and fabricated a high-mechanical-strength electronic “paper”, PEDOT:PSS/PEG-UPy film, employed a thermoplastic polyurethane poly(ethylene glycol)-2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (PEG-UPy) using diverse processing (drop coating, spin coating, blade coating and 3D printing) of its “electric ink (E-ink)” from the mechanical mixture of its isopropanol (IPA) solution with aqueous PEDOT:PSS dispersion. Compared to PEDOT:PSS film, the incorporation of supramolecular chain-expanding unit 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into the PEG-UPy molecular backbone resulted into optimized self-supporting (substrate-free) film of PEDOT:PSS/PEG-UPy(10 wt%) which showed great flexibility, enhanced mechanical strength (elongation at break 47.08 %, tensile strength of 19.16 MPa, toughness 7.973 MJ m − 3 ), considerable electrical properties (0.509 S cm −1 ), desirable physical properties including resistance to abrasion and solvent-wiping, and excellent surface-interface properties (e.g., hardness of 3H, adhesion of level 0, glossiness of 91). Its electrochromic capabilities include an optical contrast (ΔT) value of 67 %, a fast redox reaction (4 s and 3 s, respectively), and a coloring efficiency (722.19 cm 2 C −1 ). Similar to paper, they can be easily tailored or folded into a variety of forms, but have greater advances on dense morphology, flat surface, considerable optical transparency (79.5 %), as well as robust resistance to mechanical damage (in the case of bending, stretching, and folding, etc.), water (immersing > 150 days), and dirt. The combined effect of molecular design of PEG-UPy, abundant hydrogen-bonded cross-linking interaction and “good” solvent effect of IPA to PEDOT:PSS play important roles in this system. This is the first work on solution processable PEDOT:PSS-based electrochromic “paper” being able to meet much comprehensive performance requirements for the application in practical complex working environment.
研究领域:
材料科学
·
化学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2025
·
IF 13.1
Jihong Jiang,Yanchun Miao,Qianping Ran,Yali Li,Yunjian Li,Zongshuo Tao,Zeyu Lu
Fly ash, a by-product of coal combustion, is a pozzolanic solid waste with annual production of 1.63 billion tonnes, which has been widely used to replace cement clinker to develop sustainable concrete. However, the incorporation of high volumes of inert fly ash significantly reduces the early mechanical strength of concrete due to its low pozzolanic activity. This study presents an innovative strategy to effectively enhance the reactivity of fly ash by utilizing hydroxyl free radicals (•OH), highly reactive oxidative species generated by nano-TiO 2 under UV light excitation. Experimental results demonstrated that photoexcited nano-TiO 2 significantly promoted the depolymerization of inert glassy phases in fly ash, resulting in a 28 % increase in Ca(OH) 2 consumption within 72 h. Consequently, the compressive and flexural strengths of mortar at 28 days increased by 37 % and 16 %, respectively, with a strength activity index reaching 95.4 %. In addition, the water absorption and chloride ion diffusion coefficient were reduced by 15 % and 18 %, respectively, due to a more refined pore structure driven by enhanced pozzolanic reactivity. Density Functional Theory (DFT) calculations further revealed that •OH substantially lowered the energy barrier for Si-O-Al bonds cleavage (from 22.93 kcal/mol for OH − to 8.54 kcal/mol for •OH), confirming its superior catalytic efficiency and thermodynamic advantage. In conclusion, the findings confirm that photoexcited nano-TiO 2 can serve as an effective activator for enhancing the utilization efficiency of fly ash in sustainable concrete.
研究领域:
建筑材料学
·
可持续发展工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiguang Huang,Haiping Chen,Jihao Yang,Tian Zhou,Heng Zhang
Recycling fly ash for ceramic membrane fabrication not only reduces solid waste discharge, but also decreases the membrane cost. Now, fly ash is becoming a promising substitute material for ceramic membrane preparation. A significant difference between fly ashes from different plants is the particle size, which makes performances of fly ash membranes unpredictable. The novelty of this work is to clarify the effects of the particle size of fly ash on ceramic membranes, thereby giving practical suggestions on fly ash selection for ceramic membrane preparation. Ceramic membranes were fabricated with different sizes of fly ashes. Effects of particle size on porosity, pore size, microstructure, mechanical strength and gas permeability of the membrane were investigated. Results indicate that a broader particle size distribution of fly ash leads to a denser structure of membrane with a lower porosity. Pore size and gas permeability of membrane increase while bending strength decreases with the particle size increasing. Bending strength of a fly ash membrane is largely determined by large particles in the fly ash because the large particles lead to cracks in the membrane. This work provides experimental bases for developing high performance ceramic membranes from fly ash.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xu Wanjun,Yu Qingqing,Zhang Yaqi,Fu Yu,Cheng Qiaoyu,Gao Ruichang,Bao Yulong
The purpose of this study was to investigate the effect of oxidation on the physicochemical properties of gelatin and gelatin gels. Porcine skin gelatin was oxidized with different concentrations of H 2 O 2 (0–30 mM). Upon oxidation of gelatin, a significant modification of amino acid residues including glycine, proline , hydroxyproline, and hydroxylysine occurred. Zeta-potential, ordered secondary structure and the fraction of triple-helix decreased, while particle size and surface hydrophobicity increased. Gels made from oxidized gelatin showed a looser network structure indicated by scanning electron microscope, and the gels had a weakened mechanical strength and water-holding as compared to non-oxidized gelatin gels. Based on these results, a mechanism of how oxidation affects the gelatin gel properties was proposed: Oxidation-induced increase of hydrophobicity and decrease of net charges promoted aggregation between gelatin molecules, thereby limiting the formation of triple-helix, which subsequently leads to a loose network structure and eventually a weakened gel strength and water-holding capacity.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2025
·
IF 14.1
Hui Li,Fengzhen Meng,Chengwei Hu,Zhiyun Wu,Liuzhi Hao,Caijun Sun,Lijing Fang,Fan Pan,Shaoquan Bian,Huipeng Li,Mingjun Li,Bo Liu,Xiaoli Zhao
The microneedle, a minimally invasive transdermal system, provides a convenient and painless method for drug delivery. Among the various types of microneedles, hydrogel-forming microneedles (HFMs) demonstrate distinct advantages in terms of high-dose drug loading and biocompatibility. However, HFMs usually require drying to obtain sufficient puncture strength, which may destroy drug activity and increase storage costs. Herein, a high-strength HFM patch with pH-responsiveness for post-drug loading and long-term release is developed based on acrylonitrile-acrylic acid copolymer. The dipole-dipole and hydrogen bonding interactions formed through gradient solvent replacement are evenly distributed within the cross-linked network, significantly enhancing the mechanical properties of the hydrogel required for epidermal penetration. The prepared hydrogel exhibits a tensile strength of 26 MPa and a Young's modulus of 407 MPa. The microneedles formed from this hydrogel display a single needle mechanical force of 1.18 N. The post-loading mode conferred by pH responsiveness allows the drug to be encapsulated in both the tips and the substrate, acting as a reservoir. Once applied to the skin, the microneedle is activated by body fluids to achieve long-term drug release. Overall, this high-strength HFM improves the mechanical properties in the hydrated state, making it a promising minimally invasive transdermal delivery platform.
研究领域:
药剂学
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Jiaming Sun,Zhenwei Wu,Bang An,Chunhui Ma,Lifei Xu,Zhanshuo Zhang,Sha Luo,Wei Li,Shouxin Liu
Inspired by the tubular structures found in naturally occurring thermal-insulating materials, tubular cellulose aerogels with improved mechanical resistant, thermal-insulating and flame-retardant properties were prepared from kapok fibers via a facile process. In contrast to fragileness of traditional organic-inorganic composites, an optimized sample exhibited an ultra-high compressive strength of 32 MPa. The tubular structure of this material resulted in a 37.4 °C increase in heat preservation compared with that obtained from a pulp aerogel without this morphology. The H 3 PO 4 decomposed from (NH 4 ) 2 HPO 4 in the formulation crosslinked the outermost cellulose fibers to generate a clay-reinforced dense carbon layer in conjunction with montmorillonite , which restricted the movement of flames and the outflow of volatile compounds. The gaseous voids of internal tubular fibers interrupted the heat transport pathways to inhibit thermal transmission and trapped combustible volatiles to reduce the penetration pressure experienced by the dense carbon layer greatly. The combined effects of the carbon layer and tubular structure effectively limited the transfer of heat, oxygen and volatiles, leading to non-combustion of the optimal sample. This study provided a cost-effective and facile approach to prepare of thermal-insulating, fire-safe and high-strength aerogel showing promising applications in exterior wall insulation and vehicle interior.
研究领域:
材料科学
·
生物启发工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yan-Chan Wei,Gui-Xiang Liu,Ling Zhang,Wen-Zhe Xu,Shuangquan Liao,Ming-Chao Luo
Mechanical strength and toughness are usually mutually exclusive, but they can both appear in natural rubber (NR). Previous studies ascribe such excellent properties to highly cis stereoregularity of NR. To our surprise, after the removal of non-rubber components (NRC) by centrifugation, the strength and toughness of NR decrease dramatically. It is still a challenge for us to make out for the problem of how NRC affect the properties of NR. Our group ascribes the superior mechanical robustness of NR to NRC. To further verify such a viewpoint, we add phospholipids (phosphatidylcholines) into NR without NRC. Phosphatidylcholines construct a sacrificial network, which ruptures preferentially upon deformation to dissipate energy. Moreover, some of phosphatidylcholines participate in the vulcanization reaction, which further improves the mechanical strength and energy dissipation. As a result, the mechanical strength and toughness of samples are as high as 21.1 MPa and 49.6 kJ/m2, respectively, which have reached the same level as that of NR. Therefore, this work not only imitates the excellent mechanical robustness of NR but also further provides a rational design for elastomers with excellent mechanical robustness.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 17
·2986-2994
·
IF 5.342
Wen Jing Yang,Wenya Xu,Xi Tao,Wen Wang,Yaqin Hu,Xue Li,En-Tang Kang,Lianhui Wang
The fabrication of adhesive hydrogel systems is quite important for biological applications. Herein, two-stage thiol-based click reactions have been employed for the preparation and adhesion of hydrogels. In the first stage, two self-adhesive hydrogels (HG-1 and HG-2) were constructed via the thiol-based click reactions and thiol–thiol coupling reaction under different stimuli, employing the same functional copolymer poly(propargyl methacrylate-co-N-(3,4-dihydroxyphenethyl) methacrylamide-co-poly(ethylene glycol) methyl ether methacrylate) (poly(PMA-co-DMA-co-PEGMA), polyPDP) and a 4-arm thiol-PEG cross-linker. Subsequently, the two prepared hydrogels achieved responsive self-adhesion properties via the second stage of thiol-based click reactions between the preserved functional groups under different stimuli. Moreover, the self-adhered hydrogels exhibited increased mechanical strength after adhesion. The present strategy thus provides a facile approach for the fabrication of hydrogel systems with on-demand self-adhesive properties.
研究领域:
生物材料
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2024
·
IF 8.6
Xiaowei An,Jiannan Cheng,Qi Li,Jiyun Tang,Zongkui Li,Liwei Liu,Hui Yang,Chunyang Wei
Silicone-based fouling release coatings (FRCs) have shown great promise as an environmentally friendly antifouling technology, while inferior mechanical properties and insufficient substrate adhesion have hindered their further application. We focused on enhancing the mechanical robustness of silicone-based coating through the synergistic effects of hydrogen bonding , π-π aromatic interaction and covalent bonding. The resulting silicone-based coating displayed a low surface energy of 23 mJ/m 2 and improved mechanical strength and substrate adhesion, offering values up to 6.4 MPa (9.1 times higher) and 2.87 MPa (25.7 times higher), respectively. Additionally, the modified coating demonstrated a tear strength of 9.8 kN/m and mass loss only about 30 mg after enduring 10,000 wear cycles. Alkoxysilane-functionalized polyethylene glycol and quaternary ammonium salt were grafted into the cross-linking structure to make them anchored to the networks and migrated to the surface layer in seawater without releasing. The coating provided 99.1% antibacterial efficiency and effective antidiatom performance (≤ 11.2 cell/mm 2 ). After a 12-month marine field test , the developed film showed only 20% micro bio-fouling compared to 100% fouling coverage on the PDMS surface. By combining improved mechanical properties with antifouling characteristics, this new multifunctional silicone-based FRC exhibits tremendous potential for sustainable marine antifouling coating application .
研究领域:
材料科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Haimen Lin,Yiheng Li,Rubin He,Wenzhen Zheng,Yipeng Lai,Yiting Xu,Birong Zeng,Conghui Yuan,Lizong Dai
Thin hydrogel films (THFs) with submillimeter thicknesses are promising for on-skin electronics due to their exceptional shape adaptability and interfacial adhesion. However, it remains challenging for THFs simultaneously achieving high transparency, conductivity, and mechanical robustness. Moreover, the fabrication of THFs is limited by the rapid dehydration and uncontrollable swelling of hydrogels. Herein, through the design of a crosslinker 3-cinnamamylphenylboric acid (RBA), a triple-crosslinking strategy is developed to fabricate large-area THFs. Anchoring RBA onto polyvinyl alcohol (PVA) chains followed by UV-crosslinking affords hydrogels (denoted as RBVA) comprising three crosslinks including dynamic boronate ester groups, [2 + 2] photocycloaddition of cinnamamide groups, and hydrophobic aggregation. RBVA THFs with thicknesses tunable from ≈ 50 to 200 µm exhibit light transmittance ≥90% at a wavelength of range 400–800 nm, toughness of 7.2–48.0 MJ m −3 , and conductivity up to 3.63 mS cm −1 . RBVA THFs maintain constant swelling ratios and mechanical properties during long time underwater soaking or cyclic drying-swelling treatment. These thin, transparent, conductive, strong, and underwater stable RBVA THFs can be processed into invisible electronic skin with highly stable underwater sensing performances. The crosslinking strategy may inspire the design of durable and underwater stable THFs, advancing their potential in flexible electronics and biomimetic materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2019
·Vol. 84
·期 4
·432-440
·
IF 3.441
Guangjie Gai,Libin Liu,Cheng-Hui Li,Ranjita K. Bose,Dong Li,Ning Guo,Biao Kong
Graphical Tough and stretchable : A metal-coordinated polyurethane complex was fabricated by complexing a simple pyridine-containing ligand with Fe 2+ ions The strong reversible coordination bond provides mechanical strength and the basis for self-healing. The complex possesses a very high tensile strength, and excellent self-healing efficiency of around 96 % of tensile strength at room temperature. The complex is notch-insensitive and possesses a very high fracture energy of 76186 J/m 2 . Self-healing materials can prolong device life, but their relatively weak mechanical strength limits their applications. Introducing tunable metal-ligand interactions into self-healing systems can improve their mechanical strength. However, applying this concept to solid elastomers is a challenge. To address this need, polyurethane-containing metal complexes were fabricated by introduction of a pyridine-containing ligand into polyurethane, and subsequent coordination with Fe 2+ . The strong reversible coordination bond provides mechanical strength and self-healing ability. By optimizing the monomer ratio and Fe 2+ content, the resulting complex possesses a very high tensile strength of 4.6 MPa at strain of around 498 % and a high Young's modulus (3.2 MPa). Importantly, the metal complex exhibits an extremely high self-healing efficiency of approximately 96 % of tensile strength at room temperature and around 30 % at 5 °C. The complex is notch-insensitive and the fracture energy is 76186 J/m 2 , which is among the highest reported values for self-healing systems.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）