Developments in the Built Environment
·
2025
·
IF 8.2
Jian Zhang,Zhenming Li,Wentao Wang,Yaxin Tao,Yubo Sun,Xiangsheng Chen
Alkali-activated materials (AAMs) emerge as a sustainable alternative to Portland cement binders. Despite their potential, the rheological properties of alkali-activated concrete, particularly their non-linear behaviors, remain underexplored. To bridge this gap, a comparative study was conducted to examine the flow characteristics and shear thinning/thickening tendencies of alkali-activated slag (AAS) concrete. The research began with a detailed evaluation of the setting times of AAS mixtures, optimizing activator compositions to identify formulations suitable for concrete productions. Employing the Bingham and Herschel-Bulkley models, it was observed that AAS concrete with a lower silicate modulus (Ms) predominantly exhibited shear-thinning behavior. As the Ms increased, a shift toward shear-thickening behavior occurred, becoming more pronounced with higher concentrations of alkaline compounds in the activators. Furthermore, the fresh properties of AAS concrete significantly improved with increased alkali dosages in the activators, resulting in reduced dynamic yield stress and plastic viscosity, along with enhanced workability retention over time.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 2
·025701
·
IF 2.025
Mingmei Zhao,Jinqiu Zhang,Yile Liu,Zhizhao Peng,Xin Li
This paper analyzed the influence of various components and the external environment on the rheological properties of shear thickening fluid (STF). The single-factor experimental study was carried out with the silica particle size, the mass fraction of silica particles, the continuous phase's average molecular weight, and the temperature as the influencing factors. Obtain the influence of various factors on the initial viscosity, critical shear rate, thickening period and thickening ratio of STF samples. According to the crossover relationship between the shear stress and the intermolecular force when the shear thickening occurs, the STF's critical shear rate criterion is constructed. By introducing the mechanical balance between small molecules, the relationship between the particles' volume fraction and the distance between particles in the suspension system is established. The influencing factors and formulas of the STF's critical shear rate and shear capacity are deduced, which supports the conclusions obtained in the single-factor experiment. Based on the single-factor experiment conclusion, the mass fraction of silica particles, the average molecular weight of the continuous phase and the temperature are used as the influencing factors, and the critical shear rate, shear thickening ratio and maximum viscosity are the responses indicators. According to the Box-Behnken response surface methodology (RSM) design, 15 analysis experiments with three factors and three levels are carried out. Obtain the rheological characteristics of the STF and regression equation between each factor, based on the three-dimensional response surface graph and F-value in ANOVA result. We found that among the interaction effects, the interaction between the continuous phase's average molecular weight and the temperature has the most significant impact on the critical shear rate of the STF. The interaction between the silica particles' mass fraction and the continuous phase's average molecular weight significantly impacts the shear thickening ratio of the STF. The interaction between silica particles' mass fraction and the temperature has the most significant impact on the maximum viscosity of the STF. Finally, according to the response surface methodology experimental results and ideal STF rheological characteristics standard in engineering applications, when the mass fraction of silica particles is 35%, the average molecular weight of the continuous phase is 387, and the temperature is 20 °C. The critical shear rate of the STF system is 5.84 1/s, the shear thickening ratio is 102.8, and the peak viscosity is 1191.7 Pa·s, reaching the optimal theoretical value within the value scope.
研究领域:
材料科学
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Bonan Hao,Benke Li,Wei Yu
For pendular suspensions with particles in contact with immiscible secondary liquid bridges, the shear field significantly influences particle aggregates and networks. In this work, we study the structure of the pendular network and how the structure changes under large-amplitude-oscillatory shear. Using rheology and optical microscopy, we found unique network destruction followed by reconstruction with increasing strain. Two processes show different shear-field dependencies, strain-rate dependency for destruction and strain dependency for reconstruction. A nonequilibrium state diagram is constructed to show the phase behavior, where the critical particle concentration of sol–gel transition is dependent on the shear history and may depend on shear strain nonmonotonically. Two different mechanisms, shear-induced network breakdown at low strain and shear-induced agglomeration at high strain, are suggested to describe the nonmonotonic critical concentration under the upward strain sweep quantitatively.
研究领域:
材料科学
·
流变学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2017
·
IF 1.591
Jianbin Qin,Guangcheng Zhang,Xuetao Shi
The monodisperse polystyrene (PS) microspheres were prepared by dispersion polymerization. The rheological properties of shear thickening fluid (STF) based on PS microspheres dispersing in polyethylene glycol with different concentrations were studied through the steady and oscillatory shear at different temperatures, respectively. All suspensions successively present the first shear thinning, the shear thickening, and the second shear thinning. The experimental results indicate that the shear thickening behavior of STF is controlled by the concentration of PS microspheres and temperature, as changed from continuous shear thickening (CST) to discontinuous shear thickening (DST) with increasing solid content or decreasing temperature. The STF is affected by shear rate, temperature, and the viscosity of the dispersed medium, and it is reversible absolutely and presents transient response ability. Both CST and DST behave as dilatancy. The PS microsphere aggregations formed under shear stress may result in the shear thickening in STFs.
研究领域:
材料科学
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 8
·1-13
·
IF 2.184
Qin Jianbin,Zhang Guangcheng,Shi Xuetao,Tao Min
The dispersions was prepared by dispersing hydrophilic silica nanoparticles with an average diameter of 50 nm in 1-butyl-methylimidazolium tetrafluoroborate ([C 4 mim][BF 4 ]), and investigated under the steady shear and oscillatory shear, respectively. Experimental results indicate that all of the dispersions present shear thinning, notable shear thickening, and shear thinning successively with increasing shear rate; the shear thickening behavior is derived from silica nanoparticle clusters and strongly controlled by silica nanoparticle content and temperature. The shear thickening fluid (STF) exhibits reversible property and transient response ability, and the time of transient response is no more than 100 ms. The conductivity of the STF is increased with increasing silica nanoparticle content, and the conductivity of 27 wt% dispersions is even two times as big as that of pure [C 4 mim][BF 4 ]. The dispersions with high solid content dilate and present a phase transition changing from a liquid-like to a solid-like soft material in the shear thickening region. A theoretical model is developed to imitate the mechanism of shear thickening in the dispersions.
研究领域:
材料科学
·
流变学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2016
·Vol. 33
·期 3
·261-265
·
IF 2.267
Shuangbing Li,Jixiao Wang,Song Zhao,Wei Cai,Zhi Wang,Shichang Wang
The spherical silica particles in narrow size distribution with different diameters of 90 nm, 200 nm, 320 nm and 400 nm were prepared by the modified Stöber method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The phase composition of particles was characterized by X-ray diffraction. The results indicated that each of the silica particle samples was in amorphous state. The shear thickening fluids (STFs) comprising 53 vol.% of silica particles and 47 vol.% of polyethylene glycol with molecular weight of 200 g mol −1 (PEG200) were prepared and evaluated. The influence of size and size distribution on the critical shear rate and the intensity of shear thickening were analyzed. The STFs prepared by silica nanoparticles with a diameter of 90 nm showed the giant rheological effect with the critical shear rate of 2.51 s −1 , the largest viscosity of 45,500 Pa∙s and the yield stress of 181 kPa. The experiments and the analysis results demonstrated that the suspensions prepared by nanoparticles have high intensity of shear thickening.
研究领域:
胶体化学
·
流变学
·
纳米材料科学
·
软物质物理
·
功能材料
✓ 已验证
DOI
高影响因子
TISSUE & CELL
·
2022
·
IF 2.586
Yonggang Lv,Changling Wei,Boyuan Zhao
Blood vessel is one of the ‘pathways’ for cancer to metastasize, in which cells are exposed to the fluid shear stress. Although most cells are damaged by fluid shear stress, a small number of tumor cells survive and metastasize when they are exposed to low shear stress (LSS) of tiny capillary. It is important to study the survival state of damaged cells during LSS. In this study, high shear stress (HSS) was applied to simulate the blood circulation and damage cells. The viability and mitochondrial function of cells were detected after HSS and LSS loading, respectively. Further, the expression of mitochondrial related proteins and genes were detected by western blot and real-time quantitative polymerase chain reaction, respectively. The role of cytochrome c (Cyt C) was also verified in this process. The experimental results showed that the viability of HSS damaged cells was increased significantly when they were exposed to LSS subsequently. The function of mitochondria was improved via reducing the release of Cyt C by LSS during this process. This study is expected to provide potential target for suppressing hematogenous metastasis.
研究领域:
肿瘤学
·
细胞生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 15
·5769-5779
·
IF 6.482
Baowei Qiu,Long Ni,Xueqin Zhang,Yang Chen,Shengtai Zhou,Zhengguang Heng,Mei Liang,Huawei Zou
The properties of fiber–matrix interfaces are one of the most important factors that influence the performance of carbon fiber-reinforced polymer (CFRP) composites. Therefore, it is necessary to strengthen the interfacial adhesion between carbon fibers (CFs) and the matrix to obtain composites with excellent properties and meet the future demand for advanced composites. Inspired by Humulus scandens, graphene oxide (GO) was introduced on the surface of CFs to build a barb structure. The structure could achieve a mechanical interlock between CFs and the matrix to obtain good interfacial properties. Most remarkably, the bionic structure could not only effectively enhance the interfacial properties, but also deflect the direction of interfacial crack propagation as supported by detailed micro- and macro-characterizations. Compared with the original CFs, both the interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) of treated CFs increased by 49.20% and 54.93%, respectively. Above all, this work verified that the bionic structure has a good effect on the interface, and paves a new path to explore the enhancement methods of the interface.
研究领域:
材料科学
·
复合材料
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Biru Shi,Xiaoling Xu,Jiahui Zhong,Zhenyu Zhang,Haosen Ma,Yu He,Xinxin Tian,Yan Zhou,Xiangdong Liu,Dekun Sheng,Yuming Yang
Hot-melt adhesive (HMA) is commonly used in industrial manufacturing due to its ease of use. However, the direct factors that affect shear strength have been unclear in recent years, making it difficult to prepare hot melt adhesives with high shear strength, which are mostly lower than 6 MPa. In this study, three types of polyurethane HMAs, differing in the position of H-bond motifs, ureidopyrimidinone (UPy), were synthesized and characterized, the most central factor for shear strength, Young's modulus , was firstly found out and proved. Side-chain UPy provides better flexibility and more chain entanglement . The lap shear strength of SPU was about 13.48 MPa, which was the highest shear strength of PU HMA, and remained 73.4 % even after 4 cycles. Compared to the other two samples, the side-chain motifs improved the possibility of forming hydrogen bonds with adherends and increased chain mobility. This led to a more efficient wetting process and strengthened Young's modulus directly, enhancing adhesive property incomparably. This work provides a satisfactory method for achieving high shear strength in HMA.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Lianru Ma,Wei Wang,Qian Zhang,Yongrui He
To enhance the interfacial properties of carbon fiber reinforced polymer (CFRP) composites, a rigid–flexible interfacial structure was constructed by in situ growth of carbon nanotubes (CNTs) on the carbon fiber surface via chemical vapor deposition (CVD), followed by grafting polyether amines (PEA) with different molecular weights. The CNTs provided a rigid, high-modulus structure enhancing mechanical interlocking and surface area, while PEA introduced a flexible, tough segment capable of forming chemical bonds with the epoxy matrix. The synergistic effect of the CNTs and PEA significantly improved interfacial adhesion and stress transfer efficiency. Interlaminar shear strength (ILSS) and interfacial shear strength (IFSS) of the composites were increased by 44.3% and 51.4%, respectively, compared with untreated CF composites. Furthermore, the optimal molecular weight of PEA was identified, balancing the rigid reinforcement and flexible energy dissipation. This work provides a promising strategy for tailoring interfacial architecture in CFRP composites and offers insights into the design of advanced structural materials with high strength and toughness.
研究领域:
材料科学
·
复合材料
·
纳米技术
·
高分子科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jiajun Ma,Zongwei Guo,Shengtao Dai,Yannong Liu,Huiru Hu,Peikun Li,Lin Jin,Yuhui Ao
Inducing highly oriented 2D nanosheets to create a mussel-inspired interface phase on the carbon fiber (CF) surface to enhance its composites’ strength and toughness has become a great challenge. In this study, a novel coating was synthesized to induce the graphene oxide (GO) oriented distributed on the CF surface while constructing a biomimetic "Brick-and-Mortar" structural interface phase, which simultaneously promoted the strength and toughness of CF composites . Acting as a sizing agent, di-pyrene terminated PEG (py-PEG-py) facilitates abundant π-π* stacking interactions, and enables flexible chain segment motion during interface fracture of composites, as well as effectively improving the toughness of composites. Eventually, the formation of a superior mechanism on the CF surface results in remarkable properties for composites, including an interfacial shear strength (IFSS) of 99.3 MPa, interlaminar shear strength of 93.2 MPa, and flexural strength of 1430 MPa. The tensile strength and toughness increased to 1777 MPa and 45.0 MJm −3 , respectively. Simultaneously, the continuous thermal conduction pathway produced by the oriented attachment of GO on the CF surface increased in-plane thermal conductivity . The reinforcing mechanisms of the unique mussel-inspired coating were systematically investigated. This work opens up an effective and scalability avenue for obtaining high-performance CF composites.
研究领域:
材料科学
·
复合材料工程
·
界面化学
·
高分子化学
·
纳米材料学
·
仿生材料
·
力学性能
·
热传导
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Shaoping Chen,Yachao Wang,Yaning Wang,Wenhao Fan,Jingyun Guo,Jie Chen,Yu Jiang,Rasha Abdullah Ahmed Al-Yusufi,Zuhair A. Munir
In addition to the thermal and electrical characteristics of the thermoelectric material , the energy conversion efficiency of TE devices is influenced by other factors including the interface resistance, which in turn is affected by chemical changes or mechanical failure. We have investigated the use of FeTe as an electrode for iodine-doped PbTe. The telluride of iron has CTE and work function values that match well with those of PbTe. The FeTe/PbTe contact was determined as ohmic in nature with low resistance. Contact resistance and shear strength values were determined over aging times of up to 400 h at 573 K and were found to be nearly unchanged. In contrast, samples in which Fe was used as electrode showed significant decrease in shear strength and a significant increase in joint resistivity over the same aging conditions. From the electrical and thermal characterization, the conversion efficiency of the FeTe/Pb 1.0004 Te 0.997 I 0.003 /FeTe single leg was determined as 4.678% for T h = 673 K and T c = 300 K.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
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