Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第4页

Emulsion-stabilized silver nanoparticles vs. aqueous solutions: Effects on aggregation, elastic scattering, and nonlinear optical properties

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-31 DOI: 10.1016/j.colsurfa.2025.136795

Shirin Adampour, Mehdi Khazaei Nezhad, Soheil Sharifi

Silver nanoparticles are stabilized using the stable emulsion developed by mixing water, n-heptane, AOT surfactant, and Ag nanoparticles, and their nonlinear optical characteristics are studied. The plasmonic and nonlinear optical properties of emulsion-stabilized silver nanoparticles are unique due to their placement inside n-heptane and the accumulation of water nanodroplets around them. The optimal concentration and stability time of silver nanoparticles in the emulsion have been investigated to achieve the highest nonlinear absorption coefficient. By comparing the emulsion and aqueous solutions including NaCl, NaOH, L-alanine, and CTAB, a significant increase in nonlinear optical absorption along with elastic light scattering was observed in the emulsion sample, which is the result of increased aggregation of Ag nanoparticles along with a decrease in the dielectric constant of the medium. As a result, the emulsion has been introduced as a tool for modifying the optical properties of Ag nanoparticles. Nonlinear absorption mechanisms, including processes involving free carriers and reverse saturation absorption, are described. Emulsion-stabilized Ag nanoparticles can be used in photodynamic therapy. Since encapsulation enhances nonlinear optical quantities, it can be used as a solution for an effective strategy for the detection and removal of toxic pollutants such as metal ions.

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引用次数: 0

Synthesis, characterization of novel double long-chain alkyl quaternary ammonium salts and their catalytic performance in the preparation of organic sulfonates

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-31 DOI: 10.1016/j.colsurfa.2025.136783

X.Q. Zou , F.W. Liu , J.J. Liu , J.X. Wang

Two double long alkyl chains quaternary ammonium salts, DDOAB and 12-DE-12, were synthesized through the reactions of octadecyl bromide, dichloroethyl ether with N, N-dimethyl long-chain alkyl tertiary amine, respectively. The chemical structures of these compounds were characterized by ¹H NMR and HRMS. The critical micelle concentrations of DDOAB and 12-DE-12 in aqueous solution were measured to be 0.07 g/L (0.13 mmol/L) and 0.25 g/L (0.43 mmol/L), respectively. In aqueous solutions, the micelles of DDOAB and 12 - DE - 12 have diameters of approximately 5 nm and 2 nm, respectively. The catalytic activity of cetyltrimethylammonium bromide (CTAB), DDOAB, and 12-DE-12 in the reaction of alkyl halides with sulfites for the preparation of organosulfonates was evaluated. The reaction between CH₂Br₂ and K₂SO₃ was catalyzed by DDOAB (10 CMC) at 100 °C for 8 h, resulting in a 93 % yield of K₂[CH₂(SO₃)₂]. Under the same conditions, when 12-DE-12 (12 CMC) was used as the catalyst for 8 h, the yield of K₂[CH₂(SO₃)₂] reached 96 %. Compared with CTAB and DDOAB, the gemini surfactant 12-DE-12 exhibits better catalytic performance in the reaction of alkyl halides with sulfite. Additionally, a reaction mechanism for the reaction between CH₂Br₂ and K₂SO₃ has been proposed.

通过十八烷基溴、二氯乙基醚与 N，N-二甲基长链烷基叔胺的反应，分别合成了两种双长烷基链季铵盐 DDOAB 和 12-DE-12。这些化合物的化学结构通过 1H NMR 和 HRMS 进行了表征。经测量，DDOAB 和 12-DE-12 在水溶液中的临界胶束浓度分别为 0.07 克/升（0.13 毫摩尔/升）和 0.25 克/升（0.43 毫摩尔/升）。在水溶液中，DDOAB 和 12 - DE - 12 的胶束直径分别约为 5 纳米和 2 纳米。评估了十六烷基三甲基溴化铵（CTAB）、DDOAB 和 12-DE-12 在烷基卤化物与亚硫酸盐反应制备有机磺酸盐过程中的催化活性。在 DDOAB（10 CMC）的催化下，CH2Br2 与 K2SO3 在 100 °C 下反应 8 小时，K₂[CH₂(SO₃)₂] 的产率为 93%。在相同条件下，以 12-DE-12 （12 CMC）为催化剂，反应 8 小时，K₂[CH₂(SO₃)₂] 的产率达到 96%。与 CTAB 和 DDOAB 相比，双子表面活性剂 12-DE-12 在烷基卤化物与亚硫酸盐的反应中表现出更好的催化性能。此外，还提出了 CH₂Br₂ 与 K₂SO₃ 反应的机理。

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引用次数: 0

Mechanistic insights into surfactant-enhanced pyrene desorption from kaolinite: Synergistic effects of molecular interactions and flotation technology

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-31 DOI: 10.1016/j.colsurfa.2025.136769

Liang Shen , Zihan Li , Jiabao Gong , Lingyun Liu , Erle Qiao , Yifang Liu , Fanfei Min

Surfactant-enhanced remediation (SER) has emerged as an effective technique for removing polycyclic aromatic hydrocarbons (PAHs) from contaminated soils. This study investigates the SER technique for pyrene removal from kaolinite-containing soil, employing both molecular dynamics simulations and experimental methods. Seven different surfactants were analyzed to evaluate their impact on pyrene desorption from kaolinite surfaces. The results demonstrate that SDBS, SDS, TW80, and TX-100 surfactants induce strong interactions with pyrene molecules, leading to the formation of spheroid self-agglomeration structures. The elution efficiency of pyrene from kaolinite surfaces is influenced by various factors, including surfactant type, dosage, and treatment time. Elution tests reveal that anionic and non-ionic surfactants outperform cationic and amphoteric surfactants as eluents. Additionally, the integration of flotation technology significantly enhances pyrene elution efficiency in the SER process, offering a promising direction for future soil remediation strategies. This research provides fundamental insights into the mechanisms of PAH removal from soil using surfactants and highlights the potential of flotation as a complementary technique. The findings contribute to the development of more efficient and sustainable soil remediation methods.

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引用次数: 0

Development of epoxy resin-based two-way responsive actuator and its application in thermal stimulation soft robot

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136758

Baoji Hu , Mengran Li , Shuai Sun , Hao Yu , Zetong Sun , Yajie Liang , Xingwei Ren , Yalan Yang , Qiaoling Zhang

The low-cost development of intelligent response devices with actuation functions based on epoxy resin (EP) is still a challenge. In this work, EP-PEG (pEP) was developed by melt dispersion of PEG and the hardening process of EP, and the difference in thermal and mechanical properties of pEP with different PEG content was realized. Through the prehardening-stacking-hardening process, the diffusion effect of PEG, and the regulation of thermal and mechanical properties, pEP0/pEP40 (pEP0–40) with double-layer structure realized its thermal stimulation two-way actuation function. Without external mechanical action, the developed bending pEP0–40 can reduce the bending degree in the environment of 70 ℃-90 ℃ and expand the bending degree in the cooling process. The soft robotic gripper with pEP0–40 as the unit structure can perform the “grab” function in the temperature environment of 80 ℃ and the “release” function in the cooling process. In this work, the thermal, mechanical, and shape memory properties of pEP were analyzed in detail, and the thermal stimulation two-way actuation function of pEP0–40 and its soft robotic gripper at different temperatures was investigated, which provided a reference for the low-cost development of EP-based intelligent response materials which can be used in soft robots.

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引用次数: 0

Robust poly(urea-formaldehyde)/sodium alginate microcapsules for achieving efficient self-healing in concrete

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136760

Shuzhen Dong , Xin Li , Zhike Li , Yanji Zhu , Haiyan Li

Microcracks will inevitably develop in concrete during its service life. To prolong the lifespan of concrete and facilitate the automatic repair of microcracks within the matrix, novel composite microcapsules were prepared. Poly(urea-formaldehyde) resin (PUF) and sodium alginate(SA) were used to construct the walls and epoxy resin(EP) was used as the core, EP@PUF/SA microcapsules were prepared by in-situ polymerization. The surface morphology, particle size distribution, chemical structure, and thermal stability of the microcapsules were analyzed by polarizing optical microscopy (POM)/scanning electron microscopy (SEM), laser particle size determination, fourier-transform infrared spectroscopy (FTIR), and thermogravimetry (TG), respectively. It was concluded that the introduction of SA enhanced the integrity of the microcapsules, led to a decrease in the microcapsule wall thickness, and increased the core content to 80.57 ± 2.4 wt%. EP@PUF/SA microcapsule-based self-healing concrete was prepared and its mechanical properties and self-healing performance were determined. When the microcapsule content was 12 wt% and the repair age was 45 d, the compressive strength recovery rate of microcapsule-based self-healing concrete was 157.32 ± 5.60 %.

{"title":"Robust poly(urea-formaldehyde)/sodium alginate microcapsules for achieving efficient self-healing in concrete","authors":"Shuzhen Dong , Xin Li , Zhike Li , Yanji Zhu , Haiyan Li","doi":"10.1016/j.colsurfa.2025.136760","DOIUrl":"10.1016/j.colsurfa.2025.136760","url":null,"abstract":"<div><div>Microcracks will inevitably develop in concrete during its service life. To prolong the lifespan of concrete and facilitate the automatic repair of microcracks within the matrix, novel composite microcapsules were prepared. Poly(urea-formaldehyde) resin (PUF) and sodium alginate(SA) were used to construct the walls and epoxy resin(EP) was used as the core, EP@PUF/SA microcapsules were prepared by in-situ polymerization. The surface morphology, particle size distribution, chemical structure, and thermal stability of the microcapsules were analyzed by polarizing optical microscopy (POM)/scanning electron microscopy (SEM), laser particle size determination, fourier-transform infrared spectroscopy (FTIR), and thermogravimetry (TG), respectively. It was concluded that the introduction of SA enhanced the integrity of the microcapsules, led to a decrease in the microcapsule wall thickness, and increased the core content to 80.57 ± 2.4 wt%. EP@PUF/SA microcapsule-based self-healing concrete was prepared and its mechanical properties and self-healing performance were determined. When the microcapsule content was 12 wt% and the repair age was 45 d, the compressive strength recovery rate of microcapsule-based self-healing concrete was 157.32 ± 5.60 %.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"717 ","pages":"Article 136760"},"PeriodicalIF":4.9,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Alloying reaction of Ti/B high-energy self-assembled microspheres to improve combustion performance

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136762

Bidong Wu, Shanghao Du, Fan Wang, Zhihua Xue, Yu Lei, Chongwei An

The alloying reaction between highly reactive metals can release substantial energy, highlighting its potential in energetic materials. This study presents the preparation of Ti/B high-energy self-assembled microspheres using microdroplet technology, with nitrocellulose and fluorine rubber as composite binders. The properties of these high-energy microspheres were examined under three conditions: titanium excess, stoichiometric balance, and boron excess. The results demonstrate that the microspheres possess a narrow particle size distribution, high circularity, excellent flowability, and improved safety. Ignition tests revealed that the microspheres achieve stable self-sustained combustion through the alloying reaction of the raw materials, producing a high-temperature flame of approximately 1650 °C. Additionally, increasing boron content was found to enhance flame area, raise output temperature, and accelerate burning rate. These findings offer significant insights for the design of high-energy microsphere formulations.

高活性金属之间的合金化反应可释放出大量能量，凸显了其在高能材料中的潜力。本研究采用微滴技术，以硝化纤维素和氟橡胶为复合粘合剂，制备了 Ti/B 高能自组装微球。在钛过量、化学平衡和硼过量三种条件下考察了这些高能微球的特性。结果表明，微球具有粒度分布窄、圆度高、流动性好和安全性高的特点。点火试验表明，微球通过原材料的合金化反应实现了稳定的自持燃烧，产生了约 1650 °C 的高温火焰。此外，硼含量的增加还能扩大火焰面积、提高输出温度并加快燃烧速度。这些发现为高能微球配方的设计提供了重要启示。

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引用次数: 0

Formation mechanism and size prediction of millimeter-scale double emulsion in an inverted co-flowing device

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136759

Xiaoyu Yang, Qiang Chen, Jie Li, Lin Yan, Hao Liu, Haile Lei, Meifang Liu

An inverted co-flowing device was utilized to overcome challenges such as incomplete tube flow and bubble accumulation in large-diameter channels, enabling the successful generation of double emulsions exceeding 4 mm in diameter. The formation process of the double emulsion was visually analyzed and classified into five distinct stages: growth, transition, squeezing, stretching, and pinch-off. During the transition, squeezing, and pinch-off stages, the double emulsion length and minimum neck radius exhibited a linear relationship with time, whereas in the growth and stretching stages, both parameters followed a power-law relationship. Additionally, the study investigated the effects of key parameters, including the capillary number of the continuous phase, the flow rate ratio of the dispersed phase, and the outer tube diameter, on the resulting double emulsion size. A predictive equation was formulated to estimate the double emulsion size within the inverted co-flowing device, requiring no fitting parameters and demonstrating applicability across various outer tube diameters. This equation achieved a prediction error of less than 9 %, significantly enhancing size control precision in the fabrication of large double emulsions.

{"title":"Formation mechanism and size prediction of millimeter-scale double emulsion in an inverted co-flowing device","authors":"Xiaoyu Yang, Qiang Chen, Jie Li, Lin Yan, Hao Liu, Haile Lei, Meifang Liu","doi":"10.1016/j.colsurfa.2025.136759","DOIUrl":"10.1016/j.colsurfa.2025.136759","url":null,"abstract":"<div><div>An inverted co-flowing device was utilized to overcome challenges such as incomplete tube flow and bubble accumulation in large-diameter channels, enabling the successful generation of double emulsions exceeding 4 mm in diameter. The formation process of the double emulsion was visually analyzed and classified into five distinct stages: growth, transition, squeezing, stretching, and pinch-off. During the transition, squeezing, and pinch-off stages, the double emulsion length and minimum neck radius exhibited a linear relationship with time, whereas in the growth and stretching stages, both parameters followed a power-law relationship. Additionally, the study investigated the effects of key parameters, including the capillary number of the continuous phase, the flow rate ratio of the dispersed phase, and the outer tube diameter, on the resulting double emulsion size. A predictive equation was formulated to estimate the double emulsion size within the inverted co-flowing device, requiring no fitting parameters and demonstrating applicability across various outer tube diameters. This equation achieved a prediction error of less than 9 %, significantly enhancing size control precision in the fabrication of large double emulsions.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"717 ","pages":"Article 136759"},"PeriodicalIF":4.9,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reverse flotation purification of phosphogypsum and preparation of high whiteness CaSO4

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136763

Yingying Zhou , Keneng Fang , Yanlong Chen , Yiheng Chen , Cuiqin Li , Qianlin Chen

Waste phosphogypsum has garnered significant attention due to its severe environmental pollution. However, its low whiteness restricts its potential applications. In this study, impurities such as organic matter, metal ions, and silica were eliminated through reverse flotation, followed by the preparation of anhydrous CaSO₄. Characterization of phosphogypsum after reverse flotation and anhydrous CaSO₄ was conducted using XRF, SEM-EDS, XRD, and FT-IR. The findings indicate that organic matter and Fe₂O₃ content are the primary factors affecting phosphogypsum whiteness. Reverse flotation purification of raw phosphogypsum, initially possessing a whiteness of 50 % and a CaSO₄•2 H₂O content of 87.5 %, resulted in purified gypsum with a whiteness of 71 % and a CaSO₄•2 H₂O content of 94.5 %. The removal rates of organic matter and Fe₂O₃ reached 78.2 % and 61.3 %, respectively. Anhydrous CaSO₄ achieved a whiteness of up to 92 % with a purity of 96 %. The removal rates of P₂O₅, F, Al₂O₃, MgO, Fe₂O₃, Na₂O, K₂O and organic matter were 98.9 %, 100 %, 89.5 %, 88.1 %, 82.6 %, 86.4 %, 100 % and 80.4 %, respectively. In this study, an appropriate collector was employed to remove organic matter and SiO₂ from phosphogypsum in a single step, offering a novel approach for its purification. Compared to conventional calcination methods for anhydrous gypsum preparation, our approach demonstrates distinct advantages in terms of energy efficiency, cost-effectiveness, and substantially improved product quality. Furthermore, high-whiteness anhydrous CaSO₄ exhibits potential for use in coatings, presenting an innovative application route for phosphogypsum.

废磷石膏因其严重的环境污染问题而备受关注。然而，低白度限制了其潜在应用。本研究通过反浮选法去除有机物、金属离子和二氧化硅等杂质，然后制备无水 CaSO4。使用 XRF、SEM-EDS、XRD 和 FT-IR 对反浮选和无水 CaSO4 后的磷石膏进行了表征。研究结果表明，有机物和 Fe2O3 含量是影响磷石膏白度的主要因素。对最初白度为 50 %、CaSO4-2 H2O 含量为 87.5 % 的原磷石膏进行反浮选提纯后，提纯石膏的白度为 71 %、CaSO4-2 H2O 含量为 94.5 %。有机物和 Fe2O3 的去除率分别达到 78.2 % 和 61.3 %。无水 CaSO4 的白度高达 92%，纯度为 96%。P2O5、F、Al2O3、MgO、Fe2O3、Na2O、K2O 和有机物的去除率分别为 98.9%、100%、89.5%、88.1%、82.6%、86.4%、100% 和 80.4%。在这项研究中，采用了一种适当的收集器，可在一个步骤中去除磷石膏中的有机物和二氧化硅，为磷石膏的提纯提供了一种新方法。与制备无水石膏的传统煅烧方法相比，我们的方法在能源效率、成本效益和大幅提高产品质量方面具有明显优势。此外，高白度无水 CaSO4 还具有用于涂料的潜力，为磷石膏提供了一条创新的应用途径。

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引用次数: 0

A facile route for anchoring bio-inspired coatings on galvanized steel: Preparation and corrosion inhibition performance

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-29 DOI: 10.1016/j.colsurfa.2025.136727

Ruyou Li , Letian Zhang , Haiqiang Liu , Xinyu Song , Ming Chen , Ri Qiu , Yibo Ouyang

Galvanized steel is widely used in various fields due to cost-effectiveness. However, corrosion can still occur over time, especially in harsh environments, leading to the degradation of its protective zinc coating and exposure of the underlying steel to corrosive agents. This necessitates the development of additional protective measures, such as coatings, to further enhance its durability and extend its service life. Bio-inspired coatings can protect material from corrosion. In this study, we employ anodic oxidation and thiol grafting methods to prepare a lotus leaf-like superhydrophobic surface (SHS) on galvanized steel, featuring a porous coating. Dimethyl silicone oil is infused into the SHS, creating a stable lubricating liquid-infused porous surface (SLIPS) reminiscent of the Nepenthes plant. While traditional electrochemical methods offer insights into overall corrosion behavior, they cannot identify specific locations with corrosion susceptibility. This paper presents the electrochemical measurement based on droplet-scale cell for knowing the localized corrosion inhibition from superhydrophobic surface. As the comparison, traditional electrochemical impedance spectroscopy and polarization curve are also used for assessing corrosion resistance of the different coatings. The results indicate that SLIPS exhibits high corrosion resistance, mechanical durability, and self-healing properties compared to SHS. Moreover, the coating can behave self-healing property, which allows it to repair minor damages and restore its protective function. Additionally, anti-icing capabilities can be integrated into the coating to prevent the accumulation of ice, making it suitable for use in cold or freezing environments.

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引用次数: 0

Mechanobiological reprogramming in liver cancer: Conjugated linoleic acid disrupts EMT and cytoskeletal dynamics

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2025-03-28 DOI: 10.1016/j.colsurfa.2025.136744

Ibrahim Ghoytasi , Mohammad Kazemi Ashtiani , Mahsa Ghasemzad , Abbas Piryaei , Siavash Iravani , Ali Zarrabi , Massoud Vosough

The excessive increase in hepatocellular carcinoma (HCC) incidence and poor therapeutic responses have led researchers to focus on innovative approaches like differentiation therapy. An anticancer agent, conjugated linoleic acid (CLA), can induce differentiation and inhibit epithelial-mesenchymal transition (EMT) in HCC cells through the upregulation of hepatocyte nuclear factor 4 alpha (HNF4α). This study aims to investigate the mechanobiological alterations, which are important in metastasis, in HCC cells after CLA treatment. Hep3B cells were treated with different concentrations of CLA. The morphology, viability, migration ability, and variation in the density and localization of the cell’s cytoskeleton filaments (CSFs) were evaluated. Then, the induction of epithelial morphology in the cells was quantified using different geometric criteria. Finally, the effect of CLA treatment on the elastic and viscoelastic properties of the cells was investigated. CLA treatment suppressed the individual and collective migration of HCC cells and reduced their dynamic movements. With increasing concentrations of CLA, the ratio of the relative fluorescent of the filaments (RFF) decreased in the nucleus and increased in cytoplasm areas. However, the expression of vimentin in all parts of the cells was remarkably reduced. Additionally, CLA treatment increased the epithelial characteristics of the HCC cells from the morphological perspective and improved their viscoelastic properties. CLA treatment reduced the cancerous characteristics of HCC cells and inhibited the EMT process by strengthening the mechanobiological features and rearranging their cytoskeleton network.

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引用次数: 0