REVIEW OF SCIENTIFIC INSTRUMENTS
·
2017
·Vol. 88
·期 11
·
IF 1.515
Li Chuanjun,Cao Yang,Guo Rui,He Shengya,Xuan Weidong,Li Xi,Zhong Yunbo,Ren Zhongming
The contact angle (CA) goniometer adaptable to a superconducting magnet was developed based on the sessile drop method. The goniometer mainly consisted of the sampling system, the supporting system, and the image acquisition system. Some improvements were taken to avoid the effects of the magnetic field (MF) on the CA measurement. As an example, the CAs of water on two substrates of silica and polymethyl methacrylate (PMMA) were measured using the goniometer. The results with and without a MF showed a good repeatability and reliability. Additionally, the MF was found to reduce the CA of water, which probably stemmed from the change of the surface tension in the MF. The CA goniometer will become an important tool which is used to study the wettability of liquids on a solid in the MF.
研究领域:
材料科学
·
物理学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Songtao Wu,Modi Guan,Xiaohan Wang,Jing Zhang,Yuhang Zhou,Xiu Huang,Bin Pan
Wettability is a pivotal parameter to determine hydrocarbon reserves and production in shale reservoirs, typically characterized quantitatively by shale-oil-brine contact angles. This parameter is a complex function of shale composition, fluid properties, temperature etc. and is therefore very difficult for conventional theoretical methods to predict accurately and efficiently. Therefore, herein machine learning methods [eXtreme gradient boosting (XGBoost) and the Shapley additive explanations (SHAP)] were integrated to predict this parameter and analyze its sensitivity. To make up the shortage of available data in literature (only 162 data points), another 100 data points about shale/mineral-alkane-water contact angles were measured under in-situ reservoir conditions using the sessile droplet method, thus totally 262 data points were used for machine learning. Experimental results showed that shale, quartz, mica and albite became more hydrophilic with increasing temperature from 25 ℃ to 70 ℃, while K-feldspar and dolomite demonstrated the opposite trend; shale-alkane-water contact angle increased from 60° to 149° (thus wettability shifted from water-wet to oil-wet) with increasing TOC content from 1.9 wt% to 10 wt%. The XGBoost model demonstrated superior predictive accuracy than the gradient boosting regressor and support vector machine models (e.g. R 2 is 0.913, 0.876 and 0.623, respectively). The SHAP sensitivity analysis revealed that brine ionic strength, TOC content, calcite content and quartz content were the four most influential factors affecting wettability. This work presents an efficient artificial intelligence method for shale wettability prediction, which is beneficial for hydrocarbon reserves estimation and production in shale reservoirs.
研究领域:
石油工程
·
地质学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2024
·Vol. 15
·期 9
·1088
·
IF 3
Haonan Li,Muyang Zhang,Yeqian Liu,Shangneng Yu,Xionghui Li,Zejingqiu Chen,Zitao Feng,Jie Zhou,Qinghao He,Xinyi Chen,Huiru Zhang,Jiaen Zhang,Xingwei Zhang,Weijin Guo
Superhydrophobic surfaces have been used in various fields of engineering due to their resistance to corrosion and fouling and their ability to control fluid movement. Traditionally, superhydrophobic surfaces are fabricated via chemical methods of changing the surface energy or mechanical methods of controlling the surface topology. Many of the conventional mechanical methods use a top-to-bottom scheme to control the surface topolopy. Here, we develop a novel fabrication method of superhydrophobic substrates using a bottom-to-top scheme via polymer OSTE, which is a prototyping polymer material developed for the fabrication of microchips due to its superior photocuring ability, mechanical properties, and surface modification ability. We fabricate a superhydrophobic substrate by OSTE–OSTE micro mushroom forest via a two-step lithography process. At first, we fabricate an OSTE pillar forest as the mushroom stems; then, we fabricate the mushroom heads via backside lithography with diffused UV light. Such topology and surface properties of OSTE render these structures superhydrophobic, with water droplets reaching a contact angle of 152.9 ± 0.2°, a sliding angle of 4.1°, and a contact angle hysteresis of less than 0.5°. These characteristics indicate the promising potential of this substrate for superhydrophobic applications.
研究领域:
材料科学
·
表面工程
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Sustainable Systems
·
2020
·Vol. 4
·期 7
·2000049
·
IF 4.869
Huanjie Chi,Zhiguang Xu,Yiping Ma,Tingting Tang,Tao Zhang,Yan Zhao
In this work, a facile approach through UV polymerization is developed for the preparation of highly oleophobic and superhydrophilic coating on polyester fabric by using short-fluorochain acrylate (1 H ,1 H ,2 H ,2 H -tridecafluoro- n -octyl acrylate) together with hydrophilic monomer and crosslinker. The coated fabric has an oil contact angle of ≈146° for hexadecane and >150° for many other oils including cooking oil and engine oil. A water drop can completely spread on the fabric within 68 ms. As a result, oil drops on the fabric surface can be easily lifted off by immersion in water. Because of its selective wettability to water, the coated fabric can also be used for oil–water filtration or water absorption from bulk oil. It is further demonstrated that the coated fabric has good hygroscopic and antistatic properties. Fabrics with these functions may find applications including oil–water separation and especially functional clothing for which the oil repellency and easy oil removal are essential while the water repellency is less important. Antistatic properties as shown by this material, are also demanded, in areas such as work clothing for auto repair and oil industries.
研究领域:
材料科学
·
纺织工程
·
表面化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yan Jingjing,Li Yifang,Wang Fei,Li Junpeng,Liu Hongwei,Pei Zhengyu,Gao Haidong
The dynamics of droplets spreading on surfaces have been extensively studied across various influencing factors, necessitating an exploration of their effect on wettability. Herein, the specific composition, size distribution, and contact angle of the coal dust preparation were characterized by a series of experiments to determine the conditions for the simulation. Meanwhile, the multiphase volume of the fluid method was implemented in the simulations, predicated on appropriate boundary conditions, and verified by a mesh independence test. The findings confirmed that the numerical approach for contact angle validation had a minor deviation, making it suitable for multiphase interface tracking. Besides, the typical wetting pattern of droplets was hereby identified into three stages, including the moving stage (stage I), the periodic wetting stage (stage II), and the balancing stage (stage III). The initial diameter could effectively increase the coverage area and spreading time for stage II. Obviously, the first amplitude of first maximum spreading diameter (Dmax-1) significantly increased with higher impact velocities, corresponding to an increase in kinetic energy. Despite the significant spreading effect of the falling height mainly on Dmax-1 and contact time, the increased trend of wetting efficiency was not obvious. However, the spreading factor and wetting efficiency decreased with increased roughness height. Finally, the difference in spreading wettability was illustrated based on the spreading wetting mechanism. The wetting efficiency of droplets on coal dust was remarkably influenced by the dynamic spreading behaviors of droplets. Overall, the findings from this study offer insights into the extent of spreading wetting that occurs before a droplet reaches an equilibrium state.
研究领域:
能源科学
·
流体力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Mianyan Yang,Zhijun Zhang
The effect of surface roughness on the detachment between the bubbles and the glass beads (soda-lime) was comprehensively investigated. Glass beads with dimensions of −1.20 + 1.12 mm were acid etched to achieve varying degrees of surface roughness, followed by silanation reactions conducted for different immersion times. The characterization of surface roughness was conducted using a ContourGT-K 3D optical microscope. Measurements of receding contact angle, induction time and detachment force were conducted to assess the influence of surface roughness on bubble and glass bead attachment/detachment. It is observed that the etching surface of glass beads with uniform protrusions and depressions, the hydrophobic glass beads exhibited shorter induction time, larger contact angle and higher critical detachment force. However, the stability of aggregates of bubbles and hydrophilic glass beads was reduced, making them prone to detachment. Moreover, larger protrusions and depressions on hydrophobic glass bead surfaces with increasing etching time, resulted in an increase in induction time, a decrease in receding contact angle and critical detachment force. The stability of bubbles and hydrophilic glass bead aggregates remained unchanged.
研究领域:
材料科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Xiaorui Zhang,Lizhu Liu,Jinfeng Li,Ling Weng,Weiwei Cui
TiO 2 –polyester composite emulsions with low contact angle on steel sheet were prepared in a “core-shell” structure employing ultrasonic irradiation. The cluster size of the TiO 2 was reduced and the nano-particles were well dispersed. The molecular weight of the polyester resin initially decreased, then increased forming the characteristic core-shell structure. This was a clear indication that the TiO 2 particles were coated with the recombined polyester as a direct result of the ultrasonic irradiation. The contact angle of the emulsion was reduced which indicated that the wettability of the emulsion was improved without the addition of chemical additives. These results suggest the possibility of producing low contact angle coatings by mechanical way.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Shulei Shi,Xiao-Han Wang,Bingyou Jiang,Wenhan Tao,Chang-Fei Yu,Ben Ji
The natural material pectin was used as the matrix to prepare a dust suppressant. The regression model in response to the grafting ratio was established, and the optimum modification scheme was determined. The amount of monomer, initiator, cross-linking agent, and reaction temperature was 3.20 g, 0.20 g, and 0.15 g and 92 °C, respectively. Through Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy tests, not only the formation of the product in graft copolymerization reaction was validated but also the wettability of pectin was significantly improved. The surface morphology of pectin before and after modification was observed by a scanning electron microscope. After graft copolymerization treatment, the surface of pectin presented a dense grid structure, which proved that the pectin-modified dust suppressant can play a crucial role in wetting and condensing coal dust. Contact angle tests were used to characterize the effect of pectin modification on the wettability of bituminous coal before and after modification. The results of contact angle tests showed that when the droplets just contacted the bituminous coal flakes, the contact angle of modified pectin droplets on the flakes was the smallest, and the value was 55.21°. Compared with pure water droplets and unmodified pectin droplets, it decreased by 21.66° and 18.50°. The modification reaction process and dust suppression mechanism were explained at the molecular level.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiaobing Chen,Ruihang Wen,Gaocan Qi,Hechao Xu,Zhihao Yuan
Lotus leaves usually get the superhydrophobicity from the presence of epicuticular wax on its multilevel micro- and nano-structured surface. It is known that the epicuticular wax is weakly hydrophilic with a contact angle of ∼ 74°, and inorganic elemental sulfur also has a weak hydrophilicity similar to the wax. Inspired by the waxy feature, here we first attempt a superhydrophobicity-harvested strategy by modifying a rough surface with weakly hydrophilic elemental sulfur. The superhydrophobicity of a series of materials including metal hydroxides, oxides, sulfides and chlorides, metals, and even hydrophilic organics, can be achieved by prefabricating their topographic textures combined with elemental sulfur surface modification. DFT calculation suggests that the presence of V S defects on the elemental sulfur coatings can make their rough surfaces have a stronger affinity for O 2 2– than for H 2 O, which allows for the formation of O 2 2– -adsorbed layer on their surface, and thus imbues the hydrophobicity or superhydrophobicity. Our study offers a new and general approach to enhance the surface hydrophobicity via inorganic rather than low surface-energy organic modification.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2016
·
IF 3.993
Jing Shang,Kunlun Hong,Tao Wang,Dan Zhu,Jian Shen
Polyethylene oxide (PEO) has been widely used in biomedical fields. The antibiofouling property of the PEO-modified surface has been extensively investigated but is far from being fully understood. A series of PEOs with narrowly distributed molecular weight (Mw), synthesized with the technique of high vacuum anionic polymerization, have been successfully grafted onto the surface of silicon wafers. The power-law relationship between the thickness of the monolayer versus the Mw of the grafted PEO shows a scaling of 0.3, indicating compact condensing of the chains. The static contact angles show higher hydrophobicity for the layer of PEO with higher Mw, which can be attributed to the closely packed conformation of the chains with high density. The frequency shift of the contact resonance indicates that the Young’s modulus decreases and the loss factor increases with the increase in the Mw of PEO and the thickness of the PEO layers. Dielectric spectroscopy of bare or PEO-grafted wafers in the aqueous solutions reveals an interfacial polarization, which results from compositional and structural changes in the interface layer and depends on temperatures and salt concentrations. At a given grafting density, the PEO chains are swollen in pure water, demonstrating hydrophilic behavior, whereas they collapse in salt solutions, showing hydrophobic characteristics.
研究领域:
生物材料学
·
界面科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE REVIEW AND LETTERS
·
2019
·
IF 0.748
HYONCHOL CHOE,SONGHAK KIM,CHOLHUAN O,JISONG ZONG,WONCHOL SONG
In this study, the apparent contact angles of oil droplets on the rough surfaces in water were numerically studied using the Volume of Fluid (VOF) model. The results showed that the roughness of the surface affected the wettability. By increasing the roughness of the surface, the oleophilicity of the oleophilic surface and the oleophobicity of the oleophobic surface could be increased. Furthermore, the applicability and limitations of the prediction of the underwater apparent contact angle of the oil droplet by the contact angle model were investigated by 3D numerical simulations. It suggests that Wenzel model can accurately predict the underwater apparent contact angle of oil droplets on all the oleophilic, neutral and oleophobic surfaces, and Cassie model can only be applied to the oleophobic surface and Cassie–Baxter model can only be applied to the oleophilic surface.
研究领域:
材料科学
·
流体力学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Yali Wang,Wenjin Xu,Qinshan Liu,Han Guo,Xiahui Gui,Yaowen Xing
Bubble detachment plays a crucial role in preventing excessive accumulation in gas–liquid reactors and improving the mass transfer efficiency. This study investigates the effect of surface hydrophobicity on bubble detachment induced by coalescence through high-speed dynamic experiments and numerical simulations. The results show that on surfaces with low hydrophobicity (contact angles of 15 and 25°), bubbles detach because the inner contact line contracts relatively slowly, allowing the outer contact line to coalescence quickly. In contrast, on highly hydrophobic surfaces (contact angles of 35 and 45°), the simultaneous contraction of both the inner and outer contact lines prevents bubble jumping. Numerical simulations indicate that low-hydrophobicity surfaces generate sufficient kinetic energy through the pressure gradient. As hydrophobicity increases, some of the energy is dissipated through liquid-film drainage, weakening internal convection and reducing the intensity of the upward flow, which ultimately prevents bubble detachment. Energy analysis further indicates that bubble coalescence shows a weak dependence on the Bo number, while the magnitude of the adhesion energy is the key factor determining bubble jumping. When the adhesion energy exceeds approximately 20% of the released surface energy, the coalesced bubble is unable to detach.
研究领域:
化学工程
·
流体力学
✓ 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）