ADVANCED ENGINEERING MATERIALS
·
2026
·
IF 3.6
Jianliang Gong,Abuduwaili Tuohuniyazi,Haipeng Li,Lin Qin,Minghao Liao,Jie Feng,Xiaofang Zhang,Xinyi Huang,Xu Wang,Yiwang Chen
The assembly of low-cost, mass-produced yet “low-quality” multiwalled carbon nanotubes (MWCNTs) into robust, load-bearing fibers remains a significant challenge due to their low aspect ratio, poor dispersibility, high impurity content, and difficulty in achieving alignment. Here, we report a synergistic dual-polymer-assisted dry-jet acid spinning (DPA-DJAS) strategy for directly converting powder-like MWCNTs with an ultra-low aspect ratio of only 58–375 into continuous, high-performance fibers. Inside the dope, an acid-soluble poly(p-phenylene terephthalamide) enables uniform MWCNT dispersion and optimizes spinning dope rheology for continuous extrusion. Across the air gap, the dry jet promotes gravitational drawing, surface pregelation, and improved MWCNT alignment. In the coagulation bath, polyvinyl alcohol in the coagulation bath moderates the H 2 SO 4 –H 2 O exchange, yielding strip-like oriented surfaces and densely stacked MWCNTs. The resulting fibers exhibit exceptional mechanical performance, achieving tensile strengths exceeding 150 MPa and elongations up to 6.35%, while maintaining a low initial Young's modulus of ≈50 MPa—only 1.8% of that in conventionally spun CNT fibers but with a 2.57-fold increase in strength. Remarkably, a representative fiber with linear density of ≈43.8 tex can sustain a 100 g handling load via direct knotting, corresponding to an apparent tenacity of ≈2.24 cN/tex. In addition, electrical conductivity is significantly enhanced, reaching 551 S m −1 —an increase of 124% over conventional acid-spun CNT fibers. This DPA-DJAS method eliminates the need for “high-quality” CNT feedstocks and provides a scalable route to process industrial-grade MWCNT powders into lightweight, flexible, and conductive fibers for next-generation smart textiles, flexible electronics, and structural applications.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Long Mao,Yuejun Liu,Huiqing Wu,Jianhong Chen,Jin Yao
Inspired by the versatile adhesion capability of marine adhesive proteins, core-shell structured polydopamine-coated layered double hydroxide (LDH@PDA) were prepared successfully by in-situ growing PDA on the surface of MgAl-LDH with a high aspect ratio . LDH@PDA/poly(ε-caprolactone) (PCL) nanocomposites were prepared by blending LDH@PDA and pure PCL via solution casting method to obtain homogeneous films. The results of thermal analysis confirmed that LDH@PDA can act as a nucleating agent . And thermal stability of nanocomposites was improved due to core-shell structured LDH@PDA. With incorporation of as low as 1 wt% of LDH@PDA, a 20% increase in tensile strength (41.1 MPa), 26% increase in elongation at break (772%) and 26% reduction in the oxygen relative permeability were achieved. The improvement in the mechanical and gas barrier properties of nanocomposites at low filler loading was attributed to the strong interfacial interaction of LDH@PDA wtih the PCL matrix.
研究领域:
高分子材料
·
纳米复合材料
·
生物医用材料
·
材料科学
·
表面改性
·
气体阻隔
·
力学性能
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 24
·4399-4407
·
IF 3.756
Delei Liu,Bing Jiao,Haijun Zhang,Shaowei Zhang,Jianghao Liu
By taking advantage of a microwave and molten-salt co-assisted boro/carbothermal reduction method (MSM-BCTR) and cheap raw materials such as HfO2/ZrO2, B4C and amorphous carbon, three types of (HfxZr(1−x))B2 (x = 0.25, 0.50 and 0.75) solid-solution powders with a single-crystalline rod-like morphology, high compositional uniformity, long lengths of 27.8–41.6 μm and high aspect ratios of 10.1–17.2 were successfully synthesized for the first time. And the required temperature conditions of 1100 °C for 20 min were significantly milder than that required by the molten-salt-assisted reduction method even using strong but high-price elemental boron as a reducing agent. These results demonstrated that the specific MSM-BCTR conditions characterized by molten-salt medium and microwave heating were capable of greatly enhancing not only the kinetics but also the thermodynamic favorabilities of the reactions for synthesizing HfB2 and ZrB2 as well as their solid solutions ((HfxZr(1−x))B2). More interestingly, the investigation on the crystalline growth mechanism of (HfxZr1−x)B2 indicated that under the MSM-BCTR conditions, residual amorphous carbon played an important role in enhancing the oriented growth of (HfxZr(1−x))B2, by preferential adsorption onto their {001} crystal planes and therefore greatly promoting corresponding specific surface energies. This study was expected to provide a feasible way of highly-efficiently and cost-effectively synthesizing ultra-high temperature ceramic powders with a highly-crystalline structure and uniform anisotropic morphology, which were favorable for promoting the oxidation resistance and toughness of their sintered products.
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2019
·Vol. 9
·期 10
·683
·
IF 2.33
Jiazhi Zhang,Chang Li,Kelan Yan,Liming Shen,Ningzhong Bao
Inorganic–organic composite coatings with fluoroethylene vinyl ether (FEVE) resin as polymer matrix and sodium iron titanate (NFTO) whiskers with different aspect ratios as reinforcement filler are prepared by the liquid-phase blending method. The influence of aspect ratio and content of NFTO whiskers on the morphology, and the mechanical and tribological performances, of NFTO-reinforced FEVE composite coatings are investigated. The addition of NFTO whiskers can obviously enhance the mechanical and wear resistance performances of the composite coatings and reduce the friction coefficient. The worn surface and wear debris of the composite coatings are studied with scanning electron microscopy (SEM) to reveal the friction-reducing and wear resistance mechanisms. The composite coating filled with ~10 wt.% NFTO whiskers has the best wear resistance performance, since the monodispersed hard whisker can carry the load applied on the sliding surface and reduce the adhesive wear of the polymer matrix. Among the three types of NFTO whiskers, the whiskers with a medium aspect ratio show the best reinforcement effect since they provide the optimum mechanical support to the polymer matrix and cannot be pulled out from the matrix easily.Keywords:fluorocarbon coating;sodium iron titanate whisker;surface modification;mechanical performances;tribological behaviors
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 12
·4696-4704
·
IF 9.8
Da Zhang,Kexia Jin,Khak Ho Lim,Suyun Jie,Wen-Jun Wang,Xuan Yang
Cellulose nanofibrils (CNFs) are a class of emerging sustainable nanomaterial. Among all their advantages, their high surface charge offers high colloidal stability, while their higher aspect ratio favors the mechanical properties of the corresponding network materials. In order to obtain such CNFs, harsh chemical pretreatments are usually applied, leading to inferior eco-friendly characteristics for CNFs. Herein, we report an eco-friendly pretreatment using maleic anhydride (MA) esterification at a low reaction temperature of less than 100 °C without the addition of any organic solvent or toxic catalyst. Up to 83% of unreacted MA in the pretreatment can be recovered. The resultant MA-CNFs have a high surface charge density (1.6 mmol g−1) while maintaing a high aspect ratio of 390, which cannot be achieved using conventional chemical pretreatment. Moreover, the interfibrillar interaction can be well tuned through the surface MA groups, which translates to superior mechanical properties for nanopaper films possessing ultrahigh toughness (16.4 MJ m−3) and folding endurance (3.68), as well as a high transmittance of up to 88%. Altogether, this work enhances the performance of cellulosic materials in an eco-friendly manner, and provides a promising candidate for advanced nanofilm applications, which conventional materials based on pulp fibers or petroleum-based polymers will not be able to reach.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Duanchao Wang,Houyong Yu,Xuemeng Fan,Jiping Gu,Shounuan Ye,Juming Yao,Qingqing Ni
Charged nanocellulose (NC) with a high aspect ratio (larger than 100) extracted from animal or bacterial cellulose and chemical cross-linked NC aerogels have great promising applicability in material science, but facile fabrication of such NC aerogels from plant cellulose by physical cross-linking still remains a major challenge. In this work, carboxylated cellulose nanofiber (CNF) with the highest aspect ratio of 144 was extracted from wasted ginger fibers by a simple one-step acid hydrolysis. Our approach could easily make the carboxylated CNF assemble into robust bulk aerogels with tunable densities and desirable shapes on a large scale (3D macropores to mesopores) by hydrogen bonds. Excitingly, these CNF aerogels had better compression mechanical properties (99.5 kPa at 80% strain) and high shape recovery. Moreover, the CNF aerogels had strong coagulation–flocculation ability (87.1%), removal efficiency of MB dye uptake (127.73 mg/g), and moderate Cu2+ absorption capacity (45.053 mg/g), which were due to assistance mechanisms of charge neutralization, network capture effect, and chain bridging of high aspect ratio carboxylated CNF. This provided a novel physical cross-linking method to design robust aerogels with modulated networked structures to be a general substrate material for industrial applications such as superabsorbent, flocculation, oil–water separation, and potential electrical energy storage materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Yunpeng Zong,Yong Liu,Wenxia Zhao,Hao Zhang,Baojun Li,Xiang Zhou,Hui Shen
Herein, we report a simple base-free hydrothermal route for the synthesis of mesoporous TiO 2 fibers by using chitosan as direct agent. This hierarchical structure combines advantages of mesopores constructed by interconnected sub-10 nm nanocrystals on nanoscale and 1D structure with large aspect ratio on micron-scale, which is desired structural characteristic needed for the high-performance anode materials. Benefiting from such unique structural features, it demonstrates superior high charge/discharge capability, good cycling stability and rate capability when used as lithium-ion batteries electrode. For example, it can deliver a capacity of 174 mA h g −1 at 0.5C and 137 mA h g −1 at 5C after 100 cycles.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Youli Xu,Shuling Shen,Long Li,Shuning Xiao,Jing Li,Zhihong Tang,Junhe Yang
Ag 2 S-ZnS (AZ) heterostructures with tunable aspect ratio (AR) and band structure were successfully synthesized by site-selective doping of metal ions. TEM and XPS results showed that by doping Cu, Mn and Cd ions in AZ heterostructures (Cu: AZ, Mn: AZ and Cd: AZ), respectively, the morphology of AZ heterostructures changed from tadpole-shape (Cu: AZ with AR of 1.2) to matchstick-shape (Cd: AZ with AR of 3.9) due to the selective doping of Cu ions in Ag 2 S head and Cd ions in ZnS tail as well as the doping of Mn ions both in Ag 2 S head and ZnS tail (Mn: AZ with AR of 2.7). All the UV-Vis spectra of doped AZ showed Urbach tail absorption, suggesting the existence of midgap-states created by metal ion dopants , which was confirmed by PL results. Cd: AZ with the largest AR values and Cd-doping induced midgap states showed the highest photocatalytic H 2 -production rate of 1443.55 μmol h −1 g −1 . The catalytic activity of the Cd: AZ can be ascribed to the synergistic effect of midgap states and aspect ratio-dependent charge transfer, which all originate from the site-selective doping of metal ions. This investigation demonstrates a facile way to manipulate the charge carrier dynamics of semiconductor heterostructures by synergistic effects through simultaneously tuning and optimizing the electronic and morphological structures.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Song Zuo,Yu Lan,Jinpeng Luo,Fei Zhou,Lexiang Xu,Shaoxiong Xie,Xiuqin Wei,Lang Zhou,Lei Ma,Xiaomin Li,Chuanqiang Yin
Polyimide/boron nitride nanosheet (PI/BNNS) composite films have potential applications in the field of electrical devices due to the superior thermal conductivity and outstanding insulating properties of the boron nitride nanosheet. In this study, the boron nitride nanosheet (BNNS-t) was prepared by the template method using sodium chloride as the template, and B2O3 and flowing ammonia as the boron and nitrogen sources, respectively. Then, the PI/BNNS-t composite films were investigated with different loading of BNNS-t as thermally conductive fillers. The results show that BNNS-t has a high aspect ratio and a uniform lateral dimension, with a large dimension and a thin thickness, and there are a few nanosheets with angular shapes in the as-obtained BNNS-t. The synergistic effect of the above characteristics for BNNS-t is beneficial to constructing the three-dimensional heat conduction network of the PI/BNNS-t composite films, which can significantly improve the out-of-plane thermal conduction properties. And then, the out-of-plane thermal conductivity of the PI/BNNS-t composite film achieves 0.67 W m–1 K–1 at 40% loading, which is nearly 3.5 times that of the PI film.
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 6
·期 1
·309-316
·
IF 5.106
Yan Cheng,Jieming Cao,Hualiang Lv,Huanqin Zhao,Yue Zhao,Guangbin Ji
Carbon material systems, in particular carbon nanotube (CNTs)-based composites, have been demonstrated as potential electromagnetic absorbers if some difficulties, e.g., poor dispersion and lower skin-depth can be solved. To address the above barriers, amorphous bamboo-like carbon nanotubes (BCNTs) with controlled length/diameter ratios were catalyzed by tunable magnetic CoxNi1−x alloys through a facile in situ approach in this research. Such BCNT configuration can suppress the inverse microcurrent intensity and present boosted impedance matching behavior. Meanwhile, an improved dispersion state of BCNTs was achieved as compared to that of common graphited CNTs. Furthermore, reflection loss is highly influenced by the aspect ratio of BCNTs. After tailoring BCNTs to proper diameter, the sample of BCNTs/Co0.2Ni0.8 almost exhibited complete absorption focusing on X-band at low filler ratio of 20 wt%. This composite may be used as a light and efficient microwave absorber in X-band.
✓ 已验证
DOI
高影响因子
Chemical Engineering Journal Advances
·
2026
·
IF 6.9
Wenyao Li,Xinling Wang,Na Xu,Wenjie Yang,Yushi Chen,Shengnan Luo,Fang Ma,Huiping Chen,Zisen Zhang,Liguo Zhang
The development of chromatographic media with uniform particle size, high mechanical strength, and specific binding capacity is crucial for efficient protein purification. However, conventional methods often suffer from polydisperse particle sizes and low magnetic content, limiting their separation efficiency and scalability. Here, we report a scalable strategy integrating high-aspect-ratio (HAR) multi-channel droplet microfluidics with a robust physicochemical modification approach to fabricate monodisperse polyacrylamide-polyethylene glycol (PAM-PEG) magnetic microspheres. The optimized HAR microfluidic chip enabled high-throughput production of droplets with a coefficient of variation (CV) as low as 3.98%. Subsequent incorporation of PEG-modified Fe₃O₄ nanoparticles endowed the microspheres with superparamagnetic properties (saturation magnetization: 40.9 emu/g) and enhanced mechanical resilience. Through a sequential surface functionalization process involving alkaline hydrolysis, EDC/NHS activation, nitrilotriacetic acid (NTA) grafting, and Ni²⁺ chelation, the resulting PAM-PEG@Fe₃O₄-PEG@NTA-Ni²⁺ microspheres achieved a high nickel loading capacity of 50.17 μmol/mL. These microspheres exhibited a specific protein adsorption capacity of ∼44 mg/mL and demonstrated superior selectivity in capturing His-tagged proteins from complex biological matrices, outperforming commercial counterparts in both purity and non-specific binding reduction. This work presents a promising platform for next-generation bioseparation media with high throughput and tailored functionality.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jianfeng Lan,Xianhui Zhang,Jiangfan Chang,Bo Wu,Baiyi Chen,Jianhua Wu
Titanium, known for its high strength-to-weight ratio and excellent corrosion resistance, has great potential for marine engineering application. However, due to its biocompatibility, titanium is highly susceptible to undesirable biofouling in the marine environment. In this study, we developed a long-lasting anti-fouling surface by completely filling Cu 2 O into TiO 2 nanotube arrays with a high aspect ratio of 132 on the titanium. The interfacial bonding strength between the high-aspect-ratio TiO 2 nanotube arrays and the titanium was subsequently enhanced by a factor of 7.98 through a two-step post-anodization and annealing treatment, which was sufficient to resist the stripping effect of the subsequent electrochemical filling of Cu 2 O. Then, the reinforced high-aspect-ratio TiO 2 nanotube arrays were completely filled with Cu 2 O by a two-step electrochemical filling strategy, resulting in a loading amount of Cu 2 O up to 1.5 mg/cm 2 on the titanium and inhibiting its burst release in the seawater with a release rate of less than 10 μ g/(cm 2 ·d). Compared to titanium, this nanocomposite structure maintained over 99 % anti-adhesion ratio against N . incerta for up to 217 days and resisted biofouling for more than 1 month in the actual marine environment. This in-situ prepared, cost-effective, and highly-efficient anti-fouling titanium surface provides a novel strategy for large-scale applications of titanium in the marine engineering.
✓ 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）