COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Haozhe Yi,Taotao Fu,Chunying Zhu,Youguang Ma
The dynamics of droplet adsorption at the liquid-liquid interface of parallel flow in a microchannel is investigated. The adsorption process is divided into three distinct stages: the liquid bridge expansion stage, the rapid deformation stage and the spreading stage. The dynamic behavior of droplet adsorption is elucidated by quantitatively analyzing the evolution of adsorption length and droplet height over time under different droplet viscosities. This experiment makes a positive contribution to further reveal the droplet adsorption mechanism and expand the application prospect of microfluidic technology.
研究领域:
流体力学
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微流控技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Linlin Yang,Jianping Wang,Bianhua Liu,Guangmei Han,Hong Wang,Liang Yang,Jun Zhao,Ming-Yong Han,Zhongping Zhang
High lipid metabolism is one of the fundamental characteristics of cancer cells different from normal cells due to lots of energy needed for the fast proliferation of cancer cells. As an important organelle to supply cellular energy, however, the difference of lipid droplets (LDs) in their dynamic features between cancer cells and normal cells remains unclear. A key difficulty is to develop a specific fluorescence-tunable probe with high signal-to-noise for rapidly and accurately identifying cancer cells via tracking lipid droplets’ dynamics. Here, we report a solvatochromic fluorescent probe, dansyl-morpholine (DNS-M), with high LDs-specificity to achieve the effective discrimination of cancer cells from normal cells by visually profiling the feature difference of LDs dynamics. Probe DNS-M is synthesized easily by one-step reaction, and possesses a large Stokes shift ∼200 nm, excellent photostablity and LDs-targeted capability with high overlap coefficient up to 0.97. Due to the remarkable biomembrance penetration, LDs-specificity and photostability, DNS-M has been applied to distinguish cancer cells from normal cells rapidly within 1 min in living cells and fixed cells, and real-time track dynamic behaviors of LDs in cancer cells, such as association, dissociation and fusion. More importantly, a significant difference in LDs behavior modes between cancer cells and normal cells is successfully visualized for the first time with our probe. We envision that our probe will become a rapid and easy-to-operate tool for cancer diagnosis and deeper understanding of LDs-related behaviors in cancer cells.
研究领域:
生物化学
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肿瘤学
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细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yongshuang Huang,Jie Li,Meizhou Qi,Guifu Si,Chen Tan
Functionalization and reinforcement of polymers by introducing dynamic sacrificial bonds have attracted increasing attention. In this contribution, the in situ modification of isoprene rubber by the formation of sacrificial bonds during vulcanization has been investigated. The sacrificial bonds were formed by in situ introduction of hydrogen bonds and metal–ligand motifs, which became part of the vulcanized isoprene rubber network by reaction of the former with the vulcanizing agent. The introduction of three-component modifiers (nadic anhydride (NA), 2-aminopyrimidine (AP), and ZnCl2) and the molar ratio of these components can greatly affect the tensile strength and modulus of the vulcanized rubber. Under the external load, the sacrificial bonds preferentially rupture prior to the covalent network and facilitate rubber chain orientation, resulting in high fracture energy. In addition, the dynamic behavior of the sacrificial bonds and the hysteresis behavior of the vulcanized rubbers were studied.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 4
·1-10
·
IF 4.3
Guo Huiyan,Li Huaiyu,Zhang Hongzhi,Pan Lun,Shi Chengxiang,Xue Kang,Zhang Xiangwen,Zou Ji-Jun
The aluminum-water system is a promising propellant due to high energy and low signal characteristics, and the gel form is easier to store and utilize. In this work, hydrogels of water and aluminum particles were prepared using the low-molecular-weight gellant agarose. The various physical properties of gel systems, including the water loss rate, phase transition temperature, and centrifugal stability at different gellant and aluminum contents, were examined. Rheological properties were assessed through shear thinning tests, thixotropy tests, strain sweep analysis, and frequency sweep experiments. The microstructure of the gel was obtained through scanning electron microscopy images. The results show that the aluminum-hydrogel network structure is composed of micron-scale aluminum and agarose nanosheets, and the unique micro-nanostructure endows the gel with excellent mechanical strength and thermal stability, which improve with increasing gellant and aluminum contents. Notably, the gel with 2% agarose and 20% aluminum had the best performance; the storage modulus reached 90647 Pa, which was within the linear viscoelastic region, and the maximum withstand pressure was 111.2 kPa, which was 118.8% greater than that of the pure hydrogel. Additionally, the gel demonstrates remarkable shear thinning behavior and can undergo gel-sol transformation upon shearing or heating to exceeding 114 °C.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2021
·Vol. 9
·期 1
·2101515
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IF 6.147
Haoran Li,Xiaolong Chen,Wenpeng Hong,Yan Li,Boyu Li
Natural freezing at a low temperature poses fatal threats to aircraft, cables, and plants. Accelerating the rebound of the impacting droplet is an important approach to reduce ice accretion on the solid surface. Herein, a superhydrophobic copper myristate surface with a static contact angle of 158° is prepared to study the dynamic behaviors of the impacting droplet on the inclined surface. For the first time, the sudden contraction of the impacting droplet, especially in the cases at a high Weber number, is reported. With the increase of the Weber number, after reaching the maximum wetting diameter, the contraction process changes from direct contraction to sliding at first and then contracting while maintaining the maximum wetting diameter. Further investigations confirm that the sudden contraction of the trailing edge is the underlying mechanism for accelerating the droplet rebound. This discovery provides new insight and explanation for the dynamic evolution of impacting droplets on the inclined superhydrophobic surface.
研究领域:
材料科学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2024
·
IF 0
Shuai Li,Hongzhu Lai,Li Jiang,Wenyan Huang,Hongjun Yang,Qimin Jiang,Bibiao Jiang
Polymeric patchy micelles (PPMs) are nanostructures with distinct regions on their surfaces, offering unique properties for various applications. Herein, we present a straightforward method for monitoring the structure of PPMs formed via non-covalent post-assembly modification (NCPAM). By employing 1-pyrenemethylamine, a pyrene-based molecule, as both a modifier and fluorescent probe, we demonstrate that the formation of PPMs with a higher order aggregation state of pyrene induces a stronger pyrene excimer emission. This leads to variations in the excimer-to-monomer emission ratio, serving as a parameter for studying structural changes in PPMs during NCPAM. In situ monitoring of PPM formation and temperature-dependent transformations is achieved using fluorescent analytical method, providing valuable insights into their structural evolution and dynamic behaviour. This study offers a straightforward approach to understanding and controlling PPM structures, facilitating the design of advanced nanomaterials for diverse applications.
研究领域:
材料科学
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化学
·
纳米技术
✓ 已验证
DOI
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 14
·2000501
·
IF 4.948
Peipei Zhang,Baoxu Peng,Xiaoxiao Yang,Jingming Wang,Lei Jiang
Impacting the behavior of surfactant droplets impinging upon a heated surface is an intriguing research topic, and is important in spraying cooling processes. Surfactant additives significantly increase nucleate boiling heat transfer by promoting vapor bubble nucleation and foaming. However, it is still not exactly clear how surfactants influence the droplet dynamic behaviors at the heated interfaces, nor is the relationship between the droplet dynamic behaviors and heat transfer performance. Here, three familiar surfactant molecules, i.e., anionic surfactant molecule sodium dodecyl sulfate (SDS), cationic surfactant molecule hexadecylcetyltrimethylammonium bromide (CTAB), and nonionic surfactant molecule poly(ethylene glycol) 1000 (PEG-1000), are chosen to investigate the dynamic behaviors of the water droplets with surfactant additives on the heated smooth surface with different chemical components. At low temperatures, surfactant-enhanced spreading of droplets on the hydrophilic and hydrophobic surfaces is achieved due to the surfactant adsorption. At high temperature, bubble jet and bubble explosion processes on the hydrophilic surfaces can generate plenty of bubbles, the bubbles flee away the heated surface and the heat transfer efficiency greatly is improved. SDS and CTAB significantly reduce the Leidenfrost point (LFP) on the hydrophilic and hydrophobic surfaces. PEG-1000 increases the LFP, which is little affected by variation of concentration.
研究领域:
热力学
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界面化学
·
传热学
✓ 已验证
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Fang Wang,Jinchi Mu,Wenjing Lin,Yuehan Cao,Yuhan Wang,Shuai Leng,Lihong Guo,Ying Zhou
CO 2 capture is currently the most effective way to reduce global carbon emissions, which leads to the emergence of novel gas hydrate method. In this work, the significant role of graphene oxide (GO) in enhancing the dynamic behaviors of post-combustion CO 2 capture via the hydrate formation was investigated. Firstly, at the gas-liquid interface, the induction of GO increased the amount of gas transfer, and shortened the induction time for the hydrate nucleation at the heterogeneous nucleation sites provided by GO, which attracted CO 2 molecules assembling on the GO layer to participate in the hydrate nucleation based on the molecular dynamics (MD) simulations. More importantly, the hydrate growth rate was nearly doubled in 0.05 wt% GO and 4 mol% tetrahydrofuran (THF) mixed accelerators than that in pure THF and sodium dodecyl sulfate (SDS) mixed systems, which greatly boosted the gas storage capacity of CO 2 in the form of compact solid hydrates. Consequently, CO 2 separation efficiency achieved up to 76 % in the GO based accelerators, enhanced by 23.2 % compared to that in pure THF and the SDS mixed systems. The present study could provide insights into the development of new type of nanomaterial accelerators for CO 2 capture via the gas hydrate method.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Jiao Zhu,Huaguang Wang,Zexin Zhang
The ability to tune shapes of micromotors is challenging yet crucial for creating intelligent and functional micromachines with shape-dependent dynamics. Here, we demonstrate a facile strategy to synthesize Janus micromotors in large quantity whose shapes can be precisely tuned by a surfactant-induced dewetting strategy. The Janus micromotor is composed of a TiO2 microparticle partially encapsulated within a polysiloxane microsphere. A range of particle shapes, from approximately spherical to snowman, is achieved, and the shape-tunable dynamics of the micromotors are quantified. Our strategy is versatile and can be applicable to other photoactive materials, such as ZnO and Fe2O3 nanoparticles, demonstrating a general approach to synthesize Janus micromotors with controllable shapes. Such shape-tunable micromotors provide colloidal model systems for fundamental research on active matter, as well as building blocks for the fabrication of micromachines.
研究领域:
材料科学
·
纳米技术
·
物理化学
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Pengcheng Miao,Xuefei Leng,Jie Liu,Guanjun Song,Maomao He,Yang Li
The dynamic behaviors of vitrimer are influenced by the interaction of cross-link density and density of exchangeable groups, which results in the difficulty of extracting the effect of mono-variation. In this study, the dynamic behaviors of vitrimer were tuned by changing the density of exchangeable hydroxyls alone, while leaving the cross-link density undisturbed. A multi-hydroxy vitrimer network without a loading catalyst was synthesized successfully. Three-armed functionalized polycarbonate, obtained by ring-opening polymerization of 1,3-dioxan-2-one and its derivatives, was treated as a precursor polymer. Afterward, the precursor polymer was converted into vitrimer in a single step by treatment with hexamethylene diisocyanate. When the system with constant cross-link density was established, the accurate effect of the hydroxyl density on the dynamic behaviors could be characterized by stress relaxation. The relationship of essential dynamic behavioral parameters, such as topology freezing transition temperature (Tv), exchange activation energy (Ea), and Arrhenius prefactor (τ0), with the density of exchangeable hydroxyls was quantitatively discussed. The results indicated that Tv and Ea were negatively correlated with the density of exchangeable hydroxyls, while τ0 showed a positive correlation. In addition, linear models were developed to describe the relationship between dynamic behaviors of vitrimer and density of exchangeable hydroxyls. It is expected that the findings can be applied to precisely control Ea, τ0, Tv, and characteristic relaxation time (τ*) of vitrimer and can also be used as a model for the synthesis of various vitrimer materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Journal of Oral & Facial Pain and Headache
·
2024
·Vol. 38
·期 1
·77
·
IF 1.9
Zhiheng Feng,Mingcai Chen,Jue Zhang,Xin Peng
Pain assessment in trigeminal neuralgia (TN) mouse models is essential for exploring its pathophysiology and developing effective analgesics. However, pain assessment methods for TN mouse models have not been widely studied, resulting in a critical gap in our understanding of TN. With the rapid advancement of deep learning, numerous pain assessment methods based on deep learning have emerged. Nonetheless, these methods have some limitations: (1) insufficiently objective supervision signals for training, (2) failure to account for the dynamic behavioral characteristics of mouse models in the constructed models and (3) inadequate generalization ability of the models. In this study, we initially constructed an objective pain grading dataset as the ground truth for model training, which remedy the limitations of prior studies that relied on subjective evaluation as supervisory signals. Then we proposed a novel deep neural network, named trigeminal neuralgia pain assessment network (TNPAN), which fuses the static texture characteristics and dynamic behavioral characteristics of mouse facial expressions. The promising experimental results demonstrate that TNPAN exhibits exceptional accuracy and generalization capability in pain assessment.
研究领域:
神经科学
·
疼痛研究
·
深度学习
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医学影像
·
行为分析
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
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