ADVANCED MATERIALS
·
2018
·Vol. 30
·期 36
·1707424
·
IF 21.95
Huile Jin,Yongfeng Bu,Jun Li,Jianping Liu,Xing Fen,Liming Dai,Jichang Wang,Jun Lu,Shun Wang
The rational design and construction of 3D graphene assemblies is a crucial step to extend the graphene properties for practical applications. Here, a novel interfacially reactive self-assembling process is reported to prepare well-organized 3D honeycomb-like graphene assemblies with unique polygonal nanopores interconnected by silicon-oxygen chemical bonds. The newly developed silicate-bridged graphene assembly (SGA) exhibits an exceptionally high hardness of 13.09 GPa, outperforming all existing 3D graphene materials, while maintains high Young's modulus (162.96 GPa), elastic recovery (75.27%), and superb thermal stability (600 °C in air). The observed unusual merits are resulted from unique pore structure combining the mechanical stability of the trihedral-nanopore structure and the deformability of the other polygonal nanopores. As a filling material, a merely 0.05% (w/w) addition of SGA could double the impact resistance of unsaturated resins (e.g., polyester). While SGA is attractive for various applications, including body armors, wearable electronics, space elevators, and multifunctional reinforcement fibers for automobiles, and aerospace vehicles, the novel liquid sodium–water interfacial reactive self-assembling developed in this study could open avenues for further development of various well-defined 3D assemblies from graphene and many other materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2024
·Vol. 20
·期 51
·2406821
·
IF 13
Zichen Jia,Haiyue Wang,Ping Yu,Hongfei He,Qirui Huang,Wei Hong,Cai Liu,Yanji Shi,Jue Wang,Yumeng Xin,Xuemeng Jia,Juanjuan Ma,Bin Yu
Reversible and recyclable thermosets have garnered increasing attention for their smart functionality and sustainability. However, they still face challenges in balancing comprehensive performance and dynamic features. Herein, silicon (Si)─oxygen (O) and imidazole units covalent bonds are coupled to generate a new class of bio-polyimines (Bio-Si-PABZs), to endow them with high performance and excellent reprocessing capability and acid-degradability. By tailoring the molar content of diamines, this Bio-Si-PABZs displayed both a markedly high glass transition temperature (162 °C) and a high char yield at 800 °C in an oxygen atmosphere (73.1%). These Bio-Si-PABZs with their favorable properties outperformed various previously reported polyimines and competed effectively with commercial fossil-based polycarbonate. Moreover, the scratch (≈10 µ m) on the surface of samples can be self-healing within only 2 min, and an effective “ Bird Nest ”-to-“ Torch ” recycling can also be achieved through free amines solution. Most importantly, a bio-based siloxane adhesive derived from the intermediate Bio-Si-PABZ-1 by acidic degradation demonstrated broad and robust adhesion in various substrates, with values reaching up to ≈3.5 MPa. For the first time, this study lays the scientific groundwork for designing robust and recyclable polyimine thermosets with Si─O and imidazole units, as well as converting plastic wastes into thermal-reversibility and renewable adhesives.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 21
·7360-7370
·
IF 2.305
Chen Yi,Xu Weijian,Zeng Guangsheng
In order to prepare a robust thermosensitive hydrogels with ultrarapid response rate, the –Si–O– network was incorporated into the first clay cross-linked poly( N -isopropylacrylamide) network by the simultaneous hydrolytic polycondensation of tetramethoxysilane (TMOS); the two-step freezing polymerization technique was used in polymerization process for guaranteeing the very fast response rate of gels. The properties of resulting hydrogels (T-NC gels) including mechanical properties, hydrophily, swelling and response behavior show an obvious dependency on the content of added TMOS. With the increase of added TMOS, the more integrated and high-density –Si–O– network was formed in gels, which makes the gels become more robust with higher strength and modulus, while the swelling ratio and response rate decreases due to the lapped effect of increased network density and hydrophobicity. Interestingly, T-NC gels show better volume stability than that of NC gels in shrinking process.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·Vol. 44
·期 6
·3095-3105
·
IF 5.2
Xirong Xu,Weihao Yuan,Pengxiang Liu,Li Liu,Yudong Huang,Zhen Hu
Thermosetting composites are a range of high-performance materials with important applications in multiple fields. However, inaccessible damage such as microcracks ingress from the environment may appear with long term use. Over time, the micro-damage further expands and leads to material failure. The damage includes the interface damage and the matrix damage. Therefore, the healing technology of composites needs to respond and heal the micro-damage of the interface and resin in the composites synchronously. In this work, siloxane dynamic bond was introduced into matrix and interface respectively. Specifically, a new type of crosslinker containing polysiloxane was synthesized and used to cure epoxy resin. Polyhedral oligomeric silsesquioxane was modified on the surface of carbon fibers (CFs) by sizing method. The prepared resin showed great mechanical properties and thermal stability, while the mechanical strength and surface activity of the CFs were also improved. Due to siloxane chain exchange reaction, matrix and interface could healing synchronously with good healing efficiency. Furthermore, the composites could retain about 65% of their original mechanical properties after healing multiple times. Composites realized synchronous healing of the resin matrix and the interface and laid foundation for extending the service life and performance of advanced resin-based composites.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Qingbai Tian,Xin Zhang,Jiale Chang,Dongdong Chen,Siyuan You,Xiaoming Peng,Baoyu Gao,Yanan Shang,Bo Wei,Qian Li,Zhen Hu,Yue Gao,Xing Xu
Key bottlenecks of the persulfate-based advanced oxidation processes (AOPs) are the high dosage of persulfate and the secondary pollution of sulfate ion. In this work, a sustainable strategy involving the transformation of diatomite into a water purification catalyst consisting of nano-size pore enrichment and silico-oxygen bonding (Si/C@BD) was proposed. Results indicated that the pollutants with electron-donating groups can be quickly degraded by the Si/C@BD via amplified electron transfer process (ETP) under very low peroxymonosulfate (PMS) usage. Such “low-oxidant-consumption” Fenton-like chemistry can be also applied to other catalytic systems derived from a series of silicon-based materials. In addition, a pilot-scale device (54 L) based on ETP pathway was constructed, which provided a universal strategy to prevent direct contact of treated wastewater with oxidation additives, thereby solving the bottleneck of secondary pollution caused by sulfate dissolution associated with PMS oxidation systems. In addition, the Si/C@BD/PMS system exhibited the superior environmental significance and feasibility based on the quantitative analysis via the life cycle assessment (LCA). This work will be a significant contribution to the persulfate-based Fenton-like chemistry, emphasizing the low-persulfate-consumption and free-secondary-pollution characteristics with significant application value.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2022
·Vol. 16
·期 4
·4643-4649
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IF 10.269
Wei Qiulian,Sun Yunqiang,Wang Shan,Hu Zunfu,Liu Qingyun,Zheng Xiuwen
The construction of silicon-oxygen bonds has been highlighted as an exciting achievement in organosilicon and green chemistry, but their synthetic efficiency has great improvement potential, so it is crucial to explore and achieve an effective approach for synthesizing such compounds. In this study, we successfully prepared the highly dispersed platinum single-atom catalyst (Pt SAC/N-C) through a coordination-assisted strategy with a mixture of ligands (H 2 bpdc and H 2 bpydc), which were used for the O-silylation of alcohols with silanes. The strong coordination between Pt 2+ and the Pyridine N at the skeleton of UiO-67 plays a critical role in accessing the atomically isolated dispersion of Pt sites. Without the assistance of the H 2 bpydc ligands, the Pt/ UiO-67-bpdc precursor is prone to aggregation during the pyrolysis process, resulting in the formation of Pt nanoparticles. Aided by advanced characterization techniques of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption fine structure (XAFS) spectroscopy, it has been demonstrated that atomically dispersed Pt was formed on the UiO-67 through a local structure of four-coordinated Pt-N 4 , exhibiting a high actual Pt loading content (0.6962 wt.%). In the oxidation of silanes, the Pt SAC/N-C catalyst showed a high turnover frequency (TOF) value (up to 9,920 h −1 ) when the catalyst loading decreased to 0.005%. Excellent performance was maintained during recycling experiments, indicating high stability of the catalyst.
研究领域:
材料科学
·
绿色化学
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催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Fenghui Li,Hao Wu,Tianfu Zhao,Hong Wen,Wei Lin,Tianhao Wu,Fang Wang,Jie Zhou,Lianbang Wang
Coupling high-capacity silicon-based anode materials with ternary cathode materials is currently the most effective strategy to improve the energy density of lithium-ion batteries. However, the unstable interfaces between both electrodes and electrolyte impede this process. To address this issue, multifunctional additives incorporating Si O bonds have been widely adopted to bolster the stability of the solid/cathode electrolyte interface (SEI/CEI). Nevertheless, there is scanty research regarding the impact of the quantity and variety of functional groups within these multifunctional additives, which poses challenges for the efficient selection of additives and the tailoring of SEI/CEI. In this study, a series of multifunctional additives with Si O bonds were scrutinized, evaluating their chemical characteristics alongside their effects on the structural durability, interface properties, and electrochemical performance of silicon anodes. The results revealed that differences in molecular structure significantly affect their capacity to suppress LiPF 6 hydrolysis by eliminating HF/H 2 O through Si O bonds, with this capability being inversely correlated with the number of Si O bonds present. Moreover, excessive Si O bonds resulted in elevated molecular weight, increased internal resistance, and diminished cell longevity. Notably, additives containing aromatic rings, -CF 3 and C N groups enhanced the SEI robustness and extended the cycle life of silicon anodes. Further investigations demonstrated that this type of additive significantly improves the CEI stability of the NCM622 cathode. Consequently, it enabled an nSi║NCM622 full cell to retain 89.4 % of its capacity after 100 cycles at 1.0C. This study provides valuable insights into the strategic selection and effective utilization of multifunctional additives containing Si O bonds in silicon-based lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mingxue Feng,Junying Zhang,Hong-Tian Ji,Xing-Dong Xu,Shengyu Feng
The preparation of silicone material is generally carried out by hydrolytic condensation, and various methods have been tried so far to study the kinetics of silicon-oxygen bond hydrolysis. However, the process and kinetics of silicon-oxygen bond hydrolysis cannot be efficiently monitored in real-time due to the limitations of traditional testing methods. In the present study, we have successfully designed and synthesized a series of circular tetraphenylethylene (TPE) derivatives connected with different lengths of the siloxanes chain. As the chain length gets longer, the restriction on phenyl rotation in TPE derivatives becomes weaker, which induced fluorescence quenching gradually at the molecular level. Hence, it provides the most direct and convincing evidence for the effect of chain lengths in the popular restricted intramolecular rotation (RIR) mechanism with aggregation-induced emission (AIE) phenomenon. The strong fluorescent molecule was used to monitor the kinetics of silicon-oxygen bond hydrolysis in real-time successfully by the AIE method with the RIR mechanism. The high sensitivity and efficiency of fluorescence provide an unparalleled “visualization” window for real-time monitoring of the kinetic control of Si-O bond hydrolysis. Furthermore, the half-life and reaction kinetic data of Si-O bond-breaking reaction by different pH are obtained to provide a reference for scientists and engineers not only in fundamental research but also in industrial production. Finally, the aggregation-induced color-tunable emission was obtained with the different aggregation forms of molecules, exhibiting a promising potential for intelligent luminescent materials.
研究领域:
材料科学
·
化学
·
分析化学
·
物理化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Xu Jia,Jiyang Tian,Qian Zhang,Jiajun Wan,Hongjiang Song,Ying Xie,Jie Liu
For I 2 cathodes, the severe polyiodide shuttling and sluggish reaction kinetics result in unsatisfactory cycling lifespan and rate performance. Herein, a bifunctional electrophilic host is designed by engineering the electron cloud density to effectively anchor electron-rich polyiodides. Three configurations are initially screened through density functional theory simulations, which reveal that Si─O bonds can firmly anchor I 3 − via Si electrophilic centers. Owing to the considerably lower electronegativity of Si (1.90) than that of O (3.44), electrons surrounding Si atoms are strongly drawn toward O atoms, creating Si electrophilic centers. Specifically, I 3 − adsorbed onto Si─O bonds exhibits a favorable orbital configuration with a low energy gap, thereby kinetically enhancing polyiodide conversion. As a proof of concept, SiO 2 nanocrystals embedded in conductive microporous bio-carbon are derived from poplar flowers. The resulting I 2 cathodes demonstrate excellent cycling stability over 110 000 cycles at 4 A g −1 and a high rate performance with a capacity of 123.8 mAh g −1 at 100 C. Furthermore, the I 2 cathode with a loading as high as 36.5 mg cm −2 can also perform well in terms of 127.6 mAh g −1 after 100 cycles. This study presents a new route for the rational design of high-efficiency and sustainable hosts for I 2 cathodes.
研究领域:
储能
·
材料科学
·
电化学
·
纳米技术
·
计算化学
✓ 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）