NANOTECHNOLOGY
·
2022
·Vol. 33
·期 15
·155602
·
IF 3.953
Lei Shi,Hongbo Dai,Qinqqing Ni,Xiaoming Qi,Wei Liu,Rui He,Zhangyi Chi,Yaqin Fu
Macroscopic conformation of individual graphene sheets serves as the backbone of translating their intrinsic merits towards multifunctional practical applications. However, controllable and continuous assemblies of graphene-based nanomaterials to create stable macroscopic structural components are always in face of great challenge. We have developed a scalable converging-flow assisted wet-spinning methodology for continuously fabricating hollow graphene fibers (HGFs, the newest variation of solid graphene fibers) with high quality. The degradable silk thread is selectively utilized as the continuous hollow structure former that holds the coaxially stacked graphene sheets aligned through the converging-flow modulating process. For the first time, we have created the longest freestanding HGF in length of 2.1 m. The continuous HGFs are in an average diameter of 180 μm and with 4–8 μm adjustable wall thicknesses. The optimal HGF demonstrates an average tensile strength of 300 MPa and modulus of 2.49 GPa (comparable to typical solid graphene fibers, but the highest among the reported HGFs in literature) and an exceptional failure elongation of 10.8%. Additionally, our continuous HGFs exhibit spontaneous resistive response to thermal and strain stimuli (in form of large deformations and human motions), offering great potential for developing multifunctional sensors. We envision that this work demonstrates an effective and well-controlled macroscopic assembly methodology for the scaled-up mass production of HGFs.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Kai Wu,Yongzheng Zhang,Feng Gong,Dingyao Liu,Chuxin Lei,Qiang Fu
Polymer-based 1D materials with excellent axial thermal conductivity and electrical resistivity are highly demanded for thermal management in wearable electronics. In the last decades, boron nitride nanosheets (BNNS) were commonly introduced into polymer-based materials for improving their thermal conductivity, while they were mainly focused on 2D papery film or 3D bulk composite materials. 1D polymer/BNNS composite filaments are far from a rapid development, and their axial thermal conductivity is still restricted to a low value (<5 W/m K), mainly because of insufficient orientation and low addition of BNNS. Herein, a highly thermo-conductive but electrically insulating regenerated cellulose (RC)/BNNS composite filament is fabricated by a volume-confinement self-assembled method in a wet-spinning procedure, in which large-sized BNNS are mandatorily confined within the limited region among adjacent RC nanofibers at BNNS loading of 60 wt%. Attributed to its highly anisotropic conformation, the as-prepared composite filament exhibits an ultra-high thermal conductivity of 9.22 W/m K, about 4.5-fold of non-confined RC/BNNS counterpart. After being weaved into a textile and integrated with a thermoelectric generator (TEG), it enables TEG to efficiently harvest energy from body heat and continuously self-power some wearable electronics, demonstrating a significant proof of concept for its extraordinary wearable thermal management applications.
研究领域:
材料科学
·
热电应用
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuyao Li,Wang Cui,Xin Wang,Shuming Zhang,Qinghan Du,Jie Fan,Yong Liu
Aerogel fibers have sparked substantial interest as attractive candidates for thermal insulation materials. Developing aerogel fibers with the desired porous structure, good knittability, flame retardancy, and high- and low-temperature resistance is of great significance for practical applications; however, that is very challenging, especially by using an efficient method. Herein, mechanically strong and flexible aerogel fibers with remarkable thermal insulation performance are reported, which are achieved by constructing stiff-soft topological polymer networks and a multilevel hollow porous structure. The combination of polyamide-imide (PAI) with stiff chains and polyurethane (PU) with soft chains is first found to be able to form a topological entanglement architecture. More importantly, multilevel hollow pores can be constructed synchronously through just a one-step and green wet-spinning process. The resultant PAI/PU@340 aerogel fibers show an ultrahigh breaking strength of 94.5 MPa and superelastic property with a breaking strain of 20%. Furthermore, they can be knitted into fabrics with a low thermal conductivity of 25 mW/(m·K) and exhibit attractive thermal insulation property under extremely high (300 °C) and low temperatures (−191 °C), implying them as promising candidates for next-generation thermal insulation materials.
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 Chemistry A
·
2023
·Vol. 11
·期 38
·20665-20675
·
IF 11.9
Yuying Kong,Hui Mao,Zihuan Zhang,Junqi Gao,Xiao Han,Wen-Jun Wang,Khak Ho Lim,Xuan Yang
Ionic strength sensing plays a crucial role in numerous fields, and there is an urgent demand for portable and robust sensors with rapid and precise detection ability. This study presents a novel micrometer-diameter nanocellulose composite filament sensor, which can detect ionic strength with high accuracy (R2 > 0.998), using only trace amounts of a liquid sample (20 μL). The preparation of such a filament sensor contains two straightforward steps: (1) raw carbon nanotubes (CNTs) are integrated into a spinning dispersion based on cellulose nanofibrils (CNFs) through a facile co-grinding method; (2) composite filaments are obtained through a wet-spinning process to utilize the assembling structures by these two fibrillar nanoparticles, providing superior mechanical properties and baseline conductivity. Such composite filaments confine capillary swelling in nano-channels for controlled ion diffusion, which enables a precise measuring ability for a wide range of ionic strength from 10−5 to 10−1 M within 1 min. The superior selectivity towards different ions, ability to precisely determine ion content for purified water quality, anti-disturbance capacity, and performance stability under varying environmental conditions are examined. Overall, this study paves the way to utilize carbohydrate and carbon materials at nano- and macro-levels through a simple preparation method. In particular, the control of nanoparticles' assembling into macro-sized materials greatly boosts the potential of nanocomposites for practical sensor applications.
研究领域:
材料科学
·
传感技术
·
环境科学
✓ 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）