ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zonglin Liu,Xu Zhao,Fuhua Xue,Liangliang Xu,He Chen,Zhong Chen,Qian Yan,Jinhua Xiong,Haowen Zheng,Pengyang Li,Huanxin Lian,Yunxiang Chen,Qingyu Peng,Xiaodong He
MXenes, a burgeoning family of 2D materials with high conductivity and large specific surface area, are ideal electromagnetic absorbing materials. However, the ample polar functional groups lead to poor dispersion in the non-polar matrix, limiting its application in non-polar-polymer-based composites. With the help of the shear rheological properties of SiO 2 , the conflict is resolved here by directly dispersing MXene aqueous dispersion into the non-polar resin. Water is locked dynamically through SiO 2 nanoparticles among the MXene@SiO 2 nanosheets, suppressing MXene's self-restacking and aggregation in the resin matrix. Therefore, the fabrication of uniform MXene/non-polar polymer composites is achieved. Meanwhile, this method allows different nanoparticles (Fe 3 O 4 , etc.) to be evenly dispersed among the MXene nanosheets to further improve the composites' electromagnetic parameters. The as-prepared composites achieve remarkable absorbing performance with a low MXene concentration (≤5 wt.‰). The SMEP-h achieves the maximum reflection loss value of over 60 dB at 12 GHz (at the thickness of 2.15 mm), and the SMEP-F possesses a broad effective absorbing bandwidth of over 6.18 GHz (at the thickness of 1.75 mm). The shear-rheological-assisted MXene dispersion method in the non-polar matrix paves an avenue for the design of outstanding MXene-based electromagnetic absorbing composites.
研究领域:
材料科学
·
电磁学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2021
·
IF 5.584
Shengna Liu,Liancun Zheng
The classical constitutive equations for heat transfer of non-Newtonian fluids in shear flow fields neglect viscous dissipation and the field synergistic properties of rheology and heat transfer. In this paper, a novel constitutive Eq. (6) for rheological synergy thermal conductivity was derived by considering viscous dissipation. Based on this, we established an experimental platform to investigate the heat transfer properties of HEC-based silicon dioxide nanofluids (different nanoparticle sizes and volume fractions) in shear flow field for two cases: neglecting viscous dissipation and considering viscous dissipation. The results show that viscous dissipation have very important effects on heat transfer behavior at different shear rates and rheological properties. The contribution of viscous dissipation to the thermal conductivity increases with shear rate and particle volume fraction, but decreases with temperature. Among all the measured results, the maximum contribution of viscous dissipation to the thermal conductivity reached 19.86%. This confirms that the viscous dissipation is not negligible and the field synergy between rheology and heat transfer of non-Newtonian fluids must be considered in the shear flow fields.
研究领域:
热力学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
Symmetry-Basel
·
2025
·Vol. 17
·期 6
·826
·
IF 2.2
Linkai Yu,Qingyang Feng,Yifan Chen,Yongji Wu,Haizhen Sun,Hao Yang,Lining Sun
Concentration gradient generation plays a pivotal role in advancing applications across drug screening, chemical synthesis, and biomolecular studies, yet conventional methods remain constrained by labor-intensive workflows, limited throughput, and inflexible gradient control. This study presents a novel multilayer microfluidic chip leveraging shear flow-driven partitioning–recombination mechanisms to enable the flexible and high-throughput generation of concentration gradient droplets. The chip integrates interactive upper and lower polydimethylsiloxane (PDMS) layers, where sequential fluid distribution and recombination are achieved through circular and radial channels while shear forces from the oil phase induce droplet formation. Numerical simulations validated the dynamic pressure-driven concentration gradient formation, demonstrating linear gradient profiles across multiple outlets under varied flow conditions. The experimental results revealed that the shear flow mode significantly enhances mixing uniformity and droplet generation efficiency compared to continuous flow operations, attributed to intensified interfacial interactions within contraction–expansion serpentine channels. By modulating hydrodynamic parameters such as aqueous- and oil-phase flow rates, this system achieved tunable gradient slopes and droplet sizes, underscoring the intrinsic relationship between flow dynamics and gradient formation. The proposed device eliminates reliance on complex channel networks, offering a compact and scalable platform for parallelized gradient generation. This work provides a robust framework for optimizing microfluidic-based concentration gradient systems, with broad implications for high-throughput screening, combinatorial chemistry, and precision biomolecular assays.
研究领域:
药物筛选
·
化学合成
·
生物分子研究
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2017
·
IF 3.887
Yehong Wu,Zhiyong Jiang,Xingjie Zan,Yuan Lin,Qian Wang
Controlling the alignment of anisotropic nanoparticles within a three-dimensional (3D) environment over large-scale is still a challenge. In this paper, a facile method to align rod-like nanoparticles in hydrogel via shear flow to afford a long-range order is reported. The rod-like tobacco mosaic virus (TMV) was employed as a prototypical anisotropic particles in the study, and the shear force provided by the unidirectional flow of the precursor solution direct the alignment of TMVs, which could be quickly fixed through the fast sol-gel transition in situ . The degree of orientation and the distance between the TMV particles could be regulated by adjusting the concentration of hydrogels and TMVs. While the introduction of TMVs could reduce the degree of swelling of the hydrogel and help maintaining the mechanical strength of resultant hydrogels, both repulsion interaction and shear flow contributed synergistically to the assembly. This method does not require the usage of strong magnetic or electric fields, nor does it require the use of specialized lithography, thus offers a facile way to the fabrication of hydrogel materials with control of anisotropic structural features.
研究领域:
生物材料学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Minghan Wan,Bing Xu,Lei Shi,Nianben Zheng,Zhiqiang Sun
Nanofluid-based volumetric-type solar collectors have emerged as a promising technique for solar thermal applications. However, achieving the long-term stability of nanofluids under high-temperature, high-flux irradiation, and shear-flow conditions is still challenging. Herein, we propose a facile method to stabilize silicon oil-based multi-walled carbon nanotube (MWCNT) nanofluids via shear flow. The effects of shear flow on the stability of nanofluids are experimentally evaluated. Results indicate that the shearing force can break up the clusters. Once achieving a dynamic equilibrium between cluster formation and cluster breakage, the instability of nanofluids can be controlled within 7.3% for the heating temperature range 140 °C–180 °C. Besides, the shear-flow stabilized nanofluids can keep dynamic stability and maintain high solar thermal conversion performance with an efficiency reduction of within 7% after cyclic tests under irradiation of 19 Sun for 24 h. The proposed method offers a practical path for stabilizing nanofluids under harsh conditions.
研究领域:
材料科学
·
能源工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Mengni Chen,Yurong Hao,Chuanbiao Zhu,Shuang Liu,Shilong Liu,Xinpeng Hu,Xiaolong Li,Hao Wu,Xiang Lu,Jinping Qu
Thermal interface materials (TIMs) are one of the important components of materials used in electronic packaging processes to reinforce the interface heat transfer between electronic components. High thermal conductive filler-reinforced polymer composites are receiving increasing attention in electronic packaging for their excellent thermal conductivity and low cost, but their applications are limited by complex preparation processes and difficult to produce on large scale. This paper presents an efficient blending method with dry ice airburst synergistic shear force field for large-scale preparation of natural rubber/expanded graphite (NR/EG) polymer composites. The thermal conductivity of the composite in presence of dry ice airburst is 2.317 W/(m·K) for EG content of 30 wt%, compared to 1.206 W/(m·K) for the control sample without dry ice airburst, an improvement of 92.1%, indicating a significant improvement in thermal conductivity. In addition, after introduction of dry ice, tensile strength and elongation at break of composites increased by 33.7% and 9.2%, respectively, showing promising mechanical properties. The calculations showed that the shear flow field strength was increased 68.2 times by heat absorption of dry ice, and the EG exfoliation mechanism was proposed. The strategy proposed in this work provide green, simple and efficient method to prepare high thermal conductive composites without the involvement of chemical solvents, which has enormous potential in large-scale preparation of high thermal conductivity filler reinforced polymer composites.
研究领域:
材料科学
·
热管理材料
·
聚合物复合材料
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xiaoyao Wei,Tao Lin,Lulu Lu,Meng Yu,Xuefeng Yin
Cellulose nanocrystal (CNC) film is known to be one kind of dynamic color-sensing material, capable of reversible color changes in response to varying humidity levels. However, the brittleness, low hygroscopicity and poor homogeneity of these films have hindered their development. To address this limitation, we present a novel approach where we combine natural deep eutectic solvents (NADES) with sorbitol under the influence of circular shear flow to craft a CNC humidity-sensitive film with enhanced flexibility, hygroscopicity and homogeneity. The inclusion of sorbitol and NADES enhances hygroscopicity and improves the flexibility. Surprisingly, the introduction of circular shear flow was found not only to improve homogeneity, macroscopically and microscopically, but also to further enhance flexibility, toughness, and water absorption capability. The resulting composite films demonstrated highly reversible color changes across the whole visible spectrum depending on the relative humidity, showing their capability to be reliable humidity-sensing materials. Thanks to the improved homogeneity and flexibility, the obtained humidity-sensing composite film can be employed in its entirety without the need for cutting, making it a promising candidate for various applications.
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
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Xing Liu,Hong Yuan Xing,Gang Liu,Wei Fu,Wen Bo Zeng
Based on the rheological property master curve, a new definition of ageing index was proposed for styrene-butadiene-styrene block copolymer (SBS) modified bitumen. The UV ageing resistance of the combined-modifier modified SBS bitumen was evaluated. Twelve different methods of combined modification were designed with three kinds of modifiers: ultraviolet absorber (Tinuvin 770), organic montmorillonite (OMMT) and layered double hydroxide (LDHs). With modified SBS bitumen, short-term ageing (TFOT) and laboratory ultraviolet ageing (UV) were performed. The dynamic shear rheometer (DSR) was used to perform frequency sweep test on the samples before and after ageing. The rheological property master curve was obtained by fitting the constitutive model equation. Based on the rheological property master curve, a new definition ageing index was proposed for SBS bitumen to evaluate the modified bitumen with different combined-modifier. The results show that the ageing index could effectively evaluate the UV ageing resistance of SBS bitumen. The evaluation results show that the combined-modifier bitumen exhibits better anti-ultraviolet ageing effects than a single modifier. Among them, the combined-modifier modes of 0.3%Tinuvin770+5%OMMT and 0.6%Tinuvin770+2.5%LDHs performed.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
Polymers
·
2018
·Vol. 10
·期 11
·1264
·
IF 2.935
Jing Li,Meizhao Han,Yaseen Muhammad,Yu Liu,Zhibin Su,Jing Yang,Song Yang,Shaochan Duan
Styrene-butadiene styrene graphene oxide nanoplatelets (SBS-g-GOs)-modified asphalt was prepared by reacting thiolated GOs (GOs-SH) with SBS in asphalt using a thiol-ene click reaction. The temperature resistance and mechanical properties of asphalts were analyzed by dynamic shear rheology (DSR) and multiple-stress creep-recovery (MSCR) tests, which revealed that an optimum amount of GOs-SH (0.02%) can effectively improve the low temperature and anti-rutting performance of SBS asphalt. Segregation experiments showed that SBS-g-GOs possessed good stability and dispersion in base asphalt. Fluorescence microscopy results revealed that the addition of GOs-SH promoted the formation of SBS network structure. Textural and morphological characterization of GOs-SH and SBS were achieved by Fourier transform infra-red (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), atomic-force microscopy (AFM), X-ray diffraction (XRD), and scanning electron microscopy (SEM), while surface chemical composition was tested by X-ray photoelectron spectroscopy (XPS). Based on textural characterization data, a suitable reaction mechanism was proposed that involved the preferential reaction between GOs-SH and 1,2 C=C of SBS. The currently designed GOs-SH incorporated asphalt via thiol-ene click reaction provides new ideas for the preparation of modified asphalt with enhanced mechanical properties for target-oriented applications.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Xiaoyong Tan,Jiupeng Zhang,Dong Guo,Guoqing Sun,Yingying Zhou,Wenwu Zhang,Yongsheng Guan
In order to improve the repeated repair ability of asphalt-based crack sealants, two types of microcapsules were prepared and added into asphalt-based crack sealant. The epoxy resin and curing agent were microencapsulated by using interfacial polymerization method, and named as A-type and B-type microcapsules respectively. The effects of emulsifier content and core-wall ratio on the preparation of two types of microcapsules were analyzed, and SEM, FT-IR, TG-DSC, and FOM analyses were performed to study the microscopic features of microcapsules, including the particle size and size distribution, chemical components, morphological features, thermal stability as well as the dispersion of microcapsules in the sealant. Then, DSR tests were conducted with two-stage loading mode to evaluate the repeated repair ability of asphalt-based crack sealants with different dosages of microencapsulated epoxy resin and curing agent. The results show that the optimal emulsifier contents are 0.5% and 0.7% for the A-type and B-type microcapsules respectively, and the corresponding core-wall ratios are 1.3:1 and 1.1:1 respectively. The two types of microcapsules were successfully prepared with well-distributed particle sizes and sufficient thermal stability, which are be well dispersed in asphalt-based sealants. The repeated repair ability indexes were proposed based on DSR complex shear modulus and the corresponding loadings cycles. It is found that the repeated repair ability of composited sealants is obviously improved. The optimal dosage of two types of microcapsules are 3%, and a sufficient healing time is required for repairing crack due to the indispensable curing process of epoxy.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Xin Jin,Deli Li,Haoxuan Fu,Baoyun Sun,Yanhai Yang,Naisheng Guo,Jiupeng Zhang
Research on asphalt fatigue and self-healing performance can more accurately model the damage and self-healing evolution principles in practical applications. In order to analyze the rationality of evaluation indexes based on rheology to evaluate the self-healing properties of TPU modified asphalt, a dynamic shear rheometer (DSR) was used in this study to perform time, temperature, and frequency sweep tests of TPU modified asphalt for analyzing the fatigue self-healing properties of TPU modified asphalt over a broader range of temperatures and loading frequencies. This method can improve the accuracy of the fatigue failure determination criteria of TPU modified asphalt and clarify the material performance parameters of TPU asphalt modifiers. The results showed that the increase in hard segment content ( C h ) and isocyanate radical index ( r ) can effectively alleviate the decrease in shear deformation resistance of modified asphalt caused by the increase in N (load repetition). N f50 (the number of loads when the normalized modulus drops to 0.5) is more suitable to evaluate the fatigue life of TPU modified asphalt compared with N p20 (the number of loads when the DER - N curve is offset by 20% deviation from the linear undamaged line) and N 2 (the number of load times corresponding to the intersection point of the tangent line of the DER – N fitted curve and the undamaged line). The degree of self-healing will also increase with the increase in C h and r . Besides, the higher the healing temperature and the healing time, the longer the fatigue life. The effects of the self-healing evaluation index ( HI ) on the self-healing index of TPU modified asphalt were as follows: healing temperature > healing time > soft segment > C h > r > degree of damage > degree of aging > deg r ee of self-healing.
研究领域:
材料科学
·
土木工程
·
道路工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2023
·
IF 6.2
Songlin Xing,Qiqi Wang,Yang He,Li Chen
Polymer brushes with different topological architectures exhibit unparalleled interfacial and physicochemical properties and are being widely utilized in antifouling applications. However, there is an absence of a thorough understanding of the antifouling process of dynamic flow mediated by the topological structure of polymer brushes. Here, it is highlighted how the interface parameters related to biofouling in flowing carrier fluid are tuned by topologically different architectures. The mechanism by which three brushes with various topological structures (cyclic, looped, and linear brushes) encounter biological media was revealed by relating protein adhesion with nanomechanics and protein conformational transitions on poly(2-ethyl-2-oxazoline) (PEtOx) brushes. In contrast to the classically linear analogue, the cyclic PEtOx brushes confered an enhanced steric barrier and excellent lubrication at the critical density region. The impenetrable and smoother layer prevented the approach and shortened the residence time for protein on the surface, providing optimal antifouling properties at low shear rates. The looped brushes also significantly inhibited protein adhesion under prolonged high shear rates due to their unshakable conformational characteristics. These findings detailed a new evaluation framework behind polymer brushes of topology-driven biofouling repulsion under flow conditions and pointed the way toward a promising approach for the effectiveness of biomaterial design.
研究领域:
聚合物科学
·
材料科学
·
生物医学工程
·
表面化学
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）