NANO LETTERS
·
2022
·
IF 12.262
Yangqin Liu,Yilong Jiang,Junhui Sun,Yang Wang,Linmao Qian,Seong H. Kim,Lei Chen
Atomically thin two-dimensional (2D) materials are excellent candidates for utilization as a solid lubricant or additive at all length scales from macro-scale mechanical devices to micro/nano-electromechanical systems (MEMS/NEMS). In such applications, wear resistance of ultrathin 2D materials is critical for sustained lubrication performance. Here, we investigated the wear of fluorinated graphene (FG) nanosheets deposited on silicon surfaces using atomic force microscopy (AFM) and discovered that the wear resistance of FG improves as the FG thickness decreases from 4.2 to 0.8 nm (corresponding to seven layers to single layer) and the surface energy of the substrate underneath the FG nanosheets increases. On the basis of density function theory (DFT) calculations, the negative correlation of wear resistance to FG thickness and the positive correlation to substrate surface energy could be explained with the degree of interfacial charge transfer between FG and substrate which affects the strength of FG adhesion to the substrate.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 3
·334
·
IF 2.67
Jingyun Hu,Xinping Zhang
We report dependence of random lasing performance of directly spin-coated multicrystalline thin films of an organic–inorganic hybrid, halide perovskite CH3NH3PbBr3(MAPbBr3), on different substrates. It was discovered that random lasing performance is strongly dependent on the surface energy properties of the substrate, which determine the morphology and crystallization properties of the spin-coated film, and will consequently determine its optical scattering and emission properties. Using indium–tin oxide (ITO)-coated glass, fused silica, and tricyclo[5.2.1.02,6] decanedimethanol diacrylate (ADCP)-coated fused silica as the substrate materials, we compared the spectroscopic response of the random lasers and thus justified the photophysical mechanisms involved. The modification of the surface properties of the substrate enables controlling of the MAPbBr3crystallization and leads to the changing of the random lasing properties. The discoveries herein are also important for the construction of other types of laser devices, where the substrate effects should be considered during the design and preparation of the micro-/nano structures.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yulan Jian,Tianlu Xu,Dennis W. Hess,Wei Tang,Xijuan Chai,Lianpeng Zhang,Kaimeng Xu,Zhichang Guo,Hui Wan,Linkun Xie
Fast-growing bamboo offers a sustainable alternative to meet the increasing demand for wood. However, its inherent hydrophilicity limits its performance, necessitating hydrophobic modifications to enhance longevity. In this study, 1 H,1 H,2 H,2 H- perfluorodecyltrimethoxysilane was used to anchor SiO 2 nanoparticles onto bamboo surface, creating superhydrophobic coatings . The nanoparticles constructed a micro-/nano-rough structure on the bamboo surface, and fluorosilanes significantly reduced the surface energy of bamboo. The wettability , micro-morphology, chemical composition, and resistance to acid and alkali corrosion, mechanical abrasion, and UV aging of the superhydrophobic coatings were extensively investigated. The results demonstrated that the modified bamboo achieved a surface energy of 0.2±0.0 J/m 2 and a water contact angle of 156.8±0.2°. Furthermore, the coating exhibited excellent chemical and physical stability. This straightforward and effective surface treatment method offers substantial potential for broadening bamboo's applications in outdoor environments .
研究领域:
材料科学
·
林业工程
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2023
·
IF 4
Huazhang Feng,Tingting Xu,Yuanmin Zhu,Yanping Chen,Jingyun Su,Enna Ha,Ran Jia,Kan Zhang,Lei Ma,Luyang Wang
Cadmium-based semiconductors have a wide range of applications in light-emitting, energy conversion, photodetection and artificial photosynthesis. With the concern about the potential toxicity of Cd, it is necessary to recycle the element from the Cd based semiconductors. Commonly, the precipitation of Cd cations with S 2− is deemed as the end point of recycling. However, actually, CdS is easy to be oxidized and released into the environment and accumulate in the food chain. It still remains challenges on how to refine the Cd element and convert it to the raw material. Herein, we demonstrate a facile room temperature method for recycling Cd from CdS. Cd can be produced from CdS within 3 h with the help of the lithium-ethylenediamine solution. DFT calculations further confirm that the high surface energy of (100) and (101) planes are selectively attacked by the solvated electrons in the solution, which is in good accordance with the XRD, STEM-HAADF and XPS characterizations. With a total recovery efficiency of 88%, Cd is successfully recovered from the CdS powder. This method provides a new perspective on the treatment of Cd-based semiconductor waste, which is of great significance for the recycling of cadmium metal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 9
·979
·
IF 2.935
Chunfang Zhu,Haitao Yang,Hongbo Liang,Zhengyue Wang,Jun Dong,Lei Xiong,Jianping Zhou,Junjun Ke,Xi Xu,Weixian Xi
Low surface energy materials have attracted much attention due to their properties and various applications. In this work, we synthesized and characterized a series of ultraviolet (UV)-curable fluorinated siloxane polymers with various fluorinated acrylates—hexafluorobutyl acrylate, dodecafluoroheptyl acrylate, and trifluorooctyl methacrylate—grafted onto a hydrogen-containing poly(dimethylsiloxane) backbone. The structures of the fluorinated siloxane polymers were measured and confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. Then the polymers were used as surface modifiers of UV-curable commercial polyurethane (DR-U356) at different concentrations (1, 2, 3, 4, 5, and 10 wt %). Among three formulations of these fluorinated siloxane polymers modified with DR-U356, hydrophobic states (91°, 92°, and 98°) were obtained at low concentrations (1 wt %). The DR-U356 resin is only in the hydrophilic state at 59.41°. The fluorine and siloxane element contents were investigated by X-ray photoelectron spectroscopy and the results indicated that the fluorinated and siloxane elements were liable to migrate to the surface of resins. The results of the friction recovering assays showed that the recorded contact angles of the series of fluorinated siloxane resins were higher than the original values after the friction-annealing progressing.Keywords:ultraviolet (UV) curable coatings;low surface energy materials;fluorinated siloxane resin
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers in Materials
·
2024
·
IF 2.6
Qiang Li,Mingdong Lei,Ziyou Li,Qiang Gan,Yong Sun,Xiaoxing Wei
Neat high-temperature vulcanized silicone rubber (HTV SR) showed bad hydrophobicity due to the existence of a large number of inorganic reinforcing fillers on its surface, which affected its security application in outdoor insulation systems. In this work, hydrophobic silane chains were grafted onto the surface of inorganic particles on the skin layer of HTV SR by a one-step coupling modification to improve its hydrophobicity. The effects of coupling agent types and coupling reaction conditions on the hydrophobicity of HTV SR were investigated. It was determined that the perfluorooctane trichlorosilicon with a large number of low surface energy fluorine atoms was the preferred coupling agent. The contact angle of HTV SR was increased by 15.70% when the optimal coupling reaction conditions were determined to be a reaction temperature of 60°C, a reaction time of 4 h, and an amount of coupling agent of 0.5%. The study found that both etching reaction and grafting reaction occurred during the whole coupling modification process, which led to the disappearance or decrease of a lot of holes on the HTV SR surface. After the fluorination coupling reaction, the surface of HTV SR became smooth and dense that led to the decrease of water absorption. The result of Fourier-transform infrared spectroscopy analysis showed the formation of C-F bond in HTV SR after fluorination modification, and the energetic dispersive spectroscopy analysis showed that the fluorine content on the surface of the fluorinated HTV SR increased significantly. Moreover, the stability analysis showed that the fluorinated HTV SR still had a good thermal stability and mechanical property stability.
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
Soft Matter
·
2025
·
IF 2.8
Zhuohuan Guo,Zhuoyuan Ma,Dayang Wang
In this work, a series of poly(vinyl alcohol) (PVA) films with defined but varied water wettability was prepared by curing as-prepared PVA films at systematically adjusted temperatures. The polar components of surface energy (γs,p) of the resulting PVA films were calculated and correlated with the molecular configurations of their surface OH groups—free OH (OHf), trans-hydrogen bonded OH (OHt), and gauche-hydrogen bonded OH groups (OHg)—with the aid of attenuated total reflectance Fourier transform infrared spectroscopy. By decomposing the γs,p values of the PVA films as a sum of the contributions from OHf, OHt, and OHg groups, the intrinsic γs,p components of and were calculated to be 8.0 mN m−1 and 9.8 mN m−1, respectively, which were substantially smaller than that of . This provided a thermodynamic foundation not only to rationalize the unexpectedly moderated surface hydrophilicity of PVA films but also to quantitatively predict the fHB component of hydrogen-bonded OH groups on their surfaces according to their water wettability.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2025
·
IF 4.3
Shijun Long,Yali Hu,Xiangkun Dong,Lianli Shen,Yusu Wang,Yiwan Huang,Xuefeng Li
The modification of polypropylene (PP) to achieve increased hydrophobicity while maintaining structural integrity is an important yet challenging task. In this work, by introducing a hydrophobically modified inorganic filler (silica (SiO 2 ) modified with perfluorooctyltriethoxysilane (FOTS)), m-SiO 2 /PP composites are produced via melt blending, then pressing of composites into sheets with different substrates. Measurement of the contact angle gives that when pressed with polytetrafluoroethylene (PTFE) film substrate, the water contact angle of the composite with 20 wt.% m-SiO 2 can reach 140°, which is 44% higher than that of pure PP (97°).By scanning electron microscopy and micro-infrared analysis, when the composites are pressed into sheets with PTFE substrates, m-SiO 2 migrates to its pressed side. This is due to in PTFE, hydrogen atoms in the polyethylene structure are replaced by fluorine atoms, thereby forming a “fluorine generation” protective layer over the carbon–carbon skeleton. Hence, the fact that in PP composites with PTFE platens, fluorosilane chain-encapsulated PTFE sheets and m-SiO 2 are attracted to each other due to the presence of very stable C─F bonds, which have a very low surface energy. This material has self-cleaning properties and is expected to be widely used for protection against dust and oil.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 96
·93539-93545
·
IF 3.289
Ye Zhu,Hai-Bo Zhang,Lian-Jun Ding,Zheng Chen,Da-Ye Sun,Zhen-Hua Jiang
Perfluorocarbon groups or related compounds are usually used to modify polymer materials because of their low surface energy properties. In this paper, a novel perfluorocarbon-containing compound was synthesized and used as a capping agent for the preparation of perfluorocarbon chain terminated poly(ether sulfone). The regulation of the fluorine content was achieved by controlling the molecular weight. FTIR and 1H NMR spectra were used to confirm the existence of perfluorocarbon terminated groups in the polymer chains. In addition, the ratios of F/C were acquired by integral area calculation from the 1H NMR spectrum. XPS characterization showed that the surface migration phenomenon of fluorine became apparent along with the increase of the F/C ratio. Further testing found that the introduction of perfluorinated end groups into the PES chains had little influence on the polymers' mechanical and thermal performance, by contrast, their surface energy decreased efficiently from approximately 40 mJ m−2 to 16 mJ m−2 with the F/C ratio on the surface increased from 0 to 0.556, which could develop PES as a low surface energy material for industrial applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaoqian Xi,Le Zhang,Mingyuan Liu,Chunming Zhou,Lv Zhu,Yifei Cao,Cen Shao,Zhongying Wang,Cong Wei,Zihan Ren,Xiaodong Wu,Bin Fei,Haidong Ren,Hao Chen
Aqueous tape casting exhibits unique advantages in the production of large transparent ceramic (TC) flakes. However, the high surface energy of aqueous slurries results in poor wettability with carrier tapes, thereby making it difficult to obtain high-quality green bodies. In addition, organic additives always introduce unexpected defects into TCs. In this study, the wettabilities of an aqueous solution on various carrier tapes were compared, and the rheological behaviours of a slurry were systematically investigated. The cellophane (PT) carrier with high surface energy dramatically improved the wettability of the aqueous slurry. The organic content of the optimized slurry was as low as 12.0 wt%. The dried green body was defect-free, and its tensile strength reached 8.7 MPa. The deformation degree of the TC flakes was only approximately 0.3%. The YAG flakes with dimensions of 100 mm × 100 mm × 1 mm exhibited a high transmittance of 82.8% (@400 nm). The ideas, methods, and results of this study will accelerate the application of aqueous tape casting in the field of high-tech ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Chen Yang,Pengfei Li,Yong Wei,Jinchao Li,Jianwen Zhang,Shanlin Wang
To achieve superhydrophobicity with an apparent contact angle (θ*) greater than 150° on rough surfaces, materials with a high Young’s contact angle (θY > 90°) are commonly utilized. However, achieving superhydrophobicity with θY < 90° materials without specific auxiliary designs faces unknown challenges. Here, we develop a novel superhydrophobic nanocoating with θ* of ∼155° sprayed by an ethanol suspension only composed of bisphenol A epoxy resin (EPA) with a low θY of ∼70° and hydrophilic SiO2 nanoparticles. Additionally, we also show more superhydrophobic nanocoatings created by low θY resins that even down to 58°. This superhydrophobicity results from sustained three-dimensional hydrogen bonding equilibrium on the droplet surface postcontact with the rough surface, despite low θY. We also constructed a wetting transition model to quantify the impact of surface energy on the stability of droplet surface structures and revealed how the concentration of EPA can regulate the wetting behavior of the coating.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Wei Chen,Yuhang Che,Qiqiao Liu,Gang Zhao,Liu Yang,Guangyi Liu,Yangge Zhu
The very close natural floatability of molybdenite and talc has been traditionally believed as the main reason for their separation problem. However, the interactions between the basal and edge planes of the two platy minerals remain unclear. Here the hydrophobic attraction between the basal planes was proposed as the dominating factor for that problem. Flotation tests in both single and mixed mineral systems were conducted using carboxymethyl cellulose (CMC) as talc depressant and sodium isobutyl xanthate (SIBX) as molybdenite collector. Zeta potential distribution, contact angle, in situ optical microscope observation, EDLVO calculation and surface energy analysis were applied to reveal the surfacial actions between the basal and edge planes of molybdenite and talc. Molybdenite and talc showed obvious floatability difference in single mineral system, however, their separation efficiency met with big decline in mixed mineral system. Zeta potential results demonstrated that, in the presence of CMC and SIBX, negatively charged particles of molybdenite and talc aggregated rather than electrostatically repulsed and dispersed. The contact angle and particle adhesion results showed a certain degree of selective attraction between the basal planes of molybdenite and talc. The EDLVO calculation suggested the attractive interactions were ranked as: Mb(basal)-Tlc(edge) > Mb(basal)-Tlc(basal) ≈ Mb(edge)-Tlc(edge) > Mb(edge)-Tlc(basal). The surface energy calculation pointed out that the fundamental reason for the separation problem was exactly the hetero-hydrophobic attraction between their basal planes.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）