CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Xingjiang Liu,Xin Liu,Wenjuan Li,Yi Ru,Yuhan Li,Ailing Sun,Liuhe Wei
Acquiring simultaneous high strength and toughness, and efficient self-healability of polyurethane (PU) elastomer is of great challenge due to their exclusive dependence on hard segments. Herein, a transparent, puncture-resistant, notch-insensitive, resilient and self-healable elastomer (PDO-IP2.5) with giant tensile strength (29.5 ± 0.9 MPa), excellent toughness (124.9 ± 2.2 MJ/m 3 ), outstanding fracture energy (83.9 kJ/m 2 ), high puncture energy (625 mJ) and balanced self-healing efficiencies (SEs calculated in tensile strength, elongation at break and toughness > 95%) and fast physical wound re-mending (~60 s upon hot airflow) is successfully developed through deliberate phase regulation, i.e. rational design of asymmetric and bulky hard segments and optimization of hard segments content. The resulting loosely-packed hard domains play a pivotal role in conferring self-healability and generating stress-induced crystallization (SIC) of polytetramethylene ether glycol (PTMEG) chains during large deformation, which not only facilitates the chain mobility for heat-responsive dynamic exchange of hydrogen bonds and oxime-carbamate but also dissipate external force during stretching to help the SIC evolution of PTMEG chains. The SIC domains act as physical crosslinking junctions and reinforcing phase, resulting in remarkable strengthening and toughening. This strategy could enlighten researchers in academia and industry to develop strong and tough elastic materials. In the meantime, the unique comprehensive performance of the as-synthesized elastomer confers it with potential practical use in engineer-grade fields of puncture-resistant tire sealant and durable protective coatings.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-12
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IF 5.228
Pan Qiwen,Yang Dandan,Kang Shiliang,Qiu Jianrong,Dong Guoping
Rare earth doped mid-infrared (MIR) fluorescent sources have been widely investigated due to their various potential applications in the fields of communication, chemical detecting, medical surgery and so forth. However, with emission wavelength extended to MIR, multiphonon relaxation process that strongly quenched the MIR emission is one of the greatest challenges for such practical applications. In our design, we have described a controllable gas-aided annealing strategy to modulate the phase, crystal size, morphology and fluorescent performance of a material simultaneously. Uniform and monodispersed Er 3+ -doped La 2 O 2 S and La 2 O 2 SO 4 nanocrystals with a similar lattice structure, crystallinity, diameter and morphology have been introduced to investigate the impact of multiphonon relaxation on luminescence performance. Detailed spectroscopic evolutions in the region of MIR, near-infrared (NIR), visible upconversion (UC) and their corresponding decay times provide insight investigation into the fluorescent mechanism caused by multiphonon relaxation. A possible energy transfer model has also been established. Our results present direct observation and mechanistic investigation of fluorescent evolution in multiphonon relaxation process, which is conductive to design MIR fluorescent materials in the future. To the best of our knowledge, it is the first investigation on MIR fluorescent performance of La 2 O 2 S nanocrystals, which may find various applications in many photoelectronic fields.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
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2023
·
IF 15
Xuan Huang,Bingyan Xu,Jie Feng,Shengnan Hu,Wenjie Dou,Tang Yang,Changhong Zhan,Shangheng Liu,Yujin Ji,Youyong Li,Chih-Wen Pao,Zhiwei Hu,Qi Shao,Xiaoqing Huang
Phase regulation of noble metal-based nanomaterials provides a promising strategy for boosting the catalytic performance. However, realizing the continuous phase modulation in two-dimensional structures and unveiling the relevant structure-performance relationship remain significant challenges. In this work, we present the first example of continuous phase modulation in a library of Pd–Te hexagonal nanoplates (HNPs) from cubic-phase Pd4Te, rhombohedral-phase Pd20Te7, rhombohedral-phase Pd8Te3, and hexagonal-phase PdTe to hexagonal-phase PdTe2. Notably, the continuous phase regulation of the well-defined Pd–Te HNPs enables the successful modulation of the distance between adjacent Pd active sites, triggering an exciting way for tuning the relevant catalytic reactions intrinsically. The proof-of-concept oxygen reduction reaction (ORR) experiment shows a Pd–Pd distance-dependent ORR performance, where the hexagonal-phase PdTe HNPs present the best electrochemical performance in ORR (mass activity and specific activity of 1.02 A mg–1Pd and 1.83 mA cm–2Pd at 0.9 V vs RHE). Theoretical investigation reveals that the increased Pd–Pd distance relates to the weak *OH adsorption over Pd–Te HNPs, thus contributing to the remarkable ORR activity of PdTe HNPs. This work advances the phase-controlled synthesis of noble metal-based nanostructures, which gives huge impetus to the design of high-efficiency nanomaterials for diverse applications.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Wu Qian,Fang Mandi,Jiao Shizhe,Li Siyuan,Zhang Shichao,Shen Zeyu,Mao Shulan,Mao Jiale,Zhang Jiahui,Tan Yuanzhong,Shen Kang,Lv Jiaxing,Hu Wei,He Yi,Lu Yingying
Solid polymer electrolytes with large-scale processability and interfacial compatibility are promising candidates for solid-state lithium metal batteries. Among various systems, poly(vinylidene fluoride)-based polymer electrolytes with residual solvent are appealing for room-temperature battery operations. However, their porous structure and limited ionic conductivity hinder practical application. Herein, we propose a phase regulation strategy to disrupt the symmetry of poly(vinylidene fluoride) chains and obtain the dense composite electrolyte through the incorporation of MoSe 2 sheets. The electrolyte with high dielectric constant can optimize the solvation structures to achieve high ionic conductivity and low activation energy. The in-situ reactions between MoSe 2 and Li metal generate Li 2 Se fast conductor in solid electrolyte interphase, which improves the Coulombic efficiency and interfacial kinetics. The solid-state Li||Li cells achieve robust cycling at 1 mA cm −2 , and the Li||LiNi 0.8 Co 0.1 Mn 0.1 O 2 full cells show practical performance at high rate (3C), high loading (2.6 mAh cm −2 ) and in pouch cell.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yabo Sun,Sheng Chu,Xianjin Hu,Xingteng Zhang,Mingyuan Zhang,Ching-Wen Lou,Ting-Ting Li
To solve the problem of soft composites with high puncture resistance and self-healing at ambient temperature. A room-temperature self-healing thermoplastic polyurethane (TPU) coating was successfully synthesized through thoughtful phase modulation, and a type of puncture-resistant composite material was innovatively prepared by compositing TPU with high-performance aramid fabrics. The self-healing TPU coating formed a strong matrix-fiber interface through intermolecular hydrogen bonding (H-bonds) with aramid fibers. Experimental results showed that the maximum spike-puncture force and maximum knife-stab force of the composite were 14.69 and 4.22 times higher than those of pure aramid fabrics, respectively. And the self-healing efficiency of the spike stab resistance is as high as 44.91% and the self-healing efficiency of the knife stab is as high as 66.98% after 48h at 30 °C. Moreover, the room-temperature dynamics of the multiple dynamic bonds in this self-healing TPU coating positively affected the composite, which acquired an excellent ability to resist the damage inflicted by the knife-tip intrusion excellently. In conclusion, this study provided methods of researching multifunctional individual soft-stabbing protection equipment.
研究领域:
材料科学
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复合材料
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高分子科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Xueying Chen,Yeqing Chen,Jie Huang,Chen Li,Zongming Ni,Kang Zhang,Mingxuan Cao,Ting Yu,Yan Chen,Xin He,Yang Li
Cubic-phase CsPbI3 perovskite nanocrystals (CsPbI3 NCs) are widely used as a promising luminescent material in optical devices such as light-emitting diodes and lasers due to their high photoluminescence quantum efficiency and excellent color purities. However, the CsPbI3 lattice is more likely to face the problem of phase transformation due to the poor thermodynamic stability, which would lead to the decrease of its photoluminescence quantum efficiency. In this work, α-CsPbI3 NCs were synthesized by the room-temperature dual-ligand-assisted re-precipitation method under the synergistic effect of n-octanoic acid (OTAC), oleylamine (OLA), and (3-aminopropyl)triethoxysilane (APTES). The anionic OTAC and cationic OLA ligands interacted with the Pb2+ and I–, respectively, on the surface of the α-CsPbI3 NCs to passivate the defects on the surface. By the adjustment to the volume ratio of the OTAC to OLA, the synergistic effects of the dual ligands inhibited the distortion of the octahedral [PbI6]4– and maintained the cubic perovskite structure of the α-CsPbI3 NCs. The hydrolysis of APTES into the silica layer would provide efficient environmental protection and maintain the cubic phase of α-CsPbI3 at room temperature. The α-CsPbI3 NCs not only produce strong red emission upon the UV excitation but also exhibit strong up-conversion luminescent properties upon the near-infrared excitation at a low excitation power laser of 1064 nm, showing dual-mode luminescent characteristics as a promising material for potential applications in optical devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
光子学
✓ 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）