NANO
·
2021
·
IF 1.556
Xintao Chen,Xian Wu,Fang Li,Xiaofeng Zhao,Shanlin Wang
Hydrophilic–hydrophobic hybrid wettability structures, inspired by desert beetles, have been widely designed to enhance the dewdrops’ migration under subcooled or/and high-humidity environment. However, it is still a challenge to regulate the graded distribution of the hydrophilic micro-regions for condensation applications. In this paper, we design a simple spray method to prepare the superamphiphilic–superamphiphobic hybrid wettability coatings by controlling the mass ratio (MR) of superamphiphobic SiO 2 nano-powder and superamphiphilic gypsum micro-powder. We compare the macroscopical wettability, condensation heat transfer efficiency, frosting delayed time and water harvesting rate to demonstrate the unique advantage of hybrid wettability structures. The results show that the condensation heat transfer efficiency, frosting delayed time and water harvesting rate can be respectively promoted to about 131.50% ( MR = 1 : 0 . 5 ) , 134.74% ( MR = 1 : 0 . 5 ) and 135.62% ( MR = 1 : 1 ) , although their macroscopical wettability will gradually reduce with the MR increase. This work will provide substantial insights into the fabrication of efficient superhydrophilic–superhydrophobic hybrid wettability surfaces for condensation heat transfer, anti-frosting and water harvesting applications.
研究领域:
材料科学
·
热力学
·
表面工程
✓ 已验证
DOI
高影响因子
ACS ES&T Water
·
2022
·
IF 0
Tingting Zhu,Bin Liu,Senlin Shao
In this study, peracetic acid (PAA) preoxidation based on Fe(II) and UV activation was proposed to mitigate the membrane fouling caused by natural organic matters (NOM) in surface water. Owing to the dual effect of oxidation and coagulation, Fe(II)/UV/PAA preoxidation was an efficient alternative strategy prior to the ultrafiltration (UF) process, with a significantly improved membrane flux by 2.35 times and a remarkably lessened reversible fouling and irreversible fouling resistance by 95.6% and 95.7%, respectively. The degradation effect of naproxen (NAP) exhibited that the oxidation capacities followed the sequence of Fe(II)/UV/PAA > UV/PAA > Fe(II)/PAA > Fe(II)/UV. Among them, the UV/PAA system with stronger oxidative capacity exerted superior removal of organics and irreversible fouling than the Fe(II)/PAA system. For the first time, the PARAFAC-EEMs method was employed to monitor the degradation effect of oxidation on hydrophilic/hydrophobic (HPI/HPO) parts in NOM components and their influence on membrane fouling. It was found that R–C• produced by the UV/PAA process preferentially degraded C1HPI, C2HPI, and C3N-HPO components, and the recalcitrant foulants that caused irreversible fouling in the Fe(II)/UV/PAA system were small hydrophobic proteins. Moreover, the novel prediction of membrane fouling revealed that C1HPI had a higher correlation with irreversible membrane fouling than C1N-HPO. There was a certain correlation between the irreversible fouling resistance and tyrosine-like proteins and a poor correlation with humics. Hence, the PARAFAC-EEMs method has a great potential for rapid detection and prediction of membrane fouling caused by the HPI/HPO parts of different fluorescent NOM components.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jing Feng,Lieshuang Zhong,Zhiguang Guo
A desert beetle-inspired surface with alternating wettability has shown great potential in fog harvesting, which allows for the easy acquisition of fresh water. The fog harvesting mechanism has been deeply understood via the efforts of many scientists. Current studies focus on the effective fabrication of the fog harvesting material, and facile fabrication can greatly enhance its real application. In this work, using a simple spraying method and selective modification of mercaptan, we successfully fabricated a biomimetic surface with hybrid wettability consisting of a hydrophobic micro-particle/hydrophilic nano-particle hierarchical structure. When the mass ratio of Cu 2 O microparticles to ZrO 2 nanoparticles in the spraying suspension was 8:1, the as-prepared hybrid sample had the highest fog collection efficiency of approximately 1707.25 mg·cm −2 ·h −1 , which was two times higher than that of the superhydrophilic sample, showing prominent enhancement of the fog harvesting capacity. The special hierarchical structure can facilitate the water harvesting behaviour. The fabrication method has a low production cost and is facile, making the large-scale manufacture of fog harvesting collectors possible.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 24
·48804
·
IF 2.188
Yan Feng,Runjun Sun,Chengkun Liu,Meiyu Chen,Qiushi Wang
The electrospun polyamide 6 (PA6) membranes are treated with different methods. The rough surfaces with different protuberances size and the fiber diameter are prepared by wet, dry heat, wet heat, and ethanol treatments under relaxation, and the formation mechanisms are analyzed. A relative stable structure of PA6 membrane is also prepared by ethanol treatment under tension, and its structure is as same as the untreated membrane. The dynamic water contact angles (WCAs) of the treated membranes are measured. The starting WCA of the membrane with wet heat treatment under relaxation is 90.95°, which is larger than those of wet, dry heat, and ethanol treatments under relaxation. The effects of surface morphologies with different treatments on wettability are analyzed. For obtaining hydrophobicity, the membrane with wet heat treatment under relaxation was coated by polyvinylidene fluoride (PVDF). The WCA of the membrane increases to 127.1° after coating. From another point of view, the WCA of the PVDF/treated PA6 membrane is much larger than that of the pure casting PVDF membrane, which means the rough surface of the treated PA6 membrane can improve the hydrophobicity of the PVDF membrane. Furthermore, the membrane is endowed with superhydrophobicity (WCA of 153.5°) after being coated by SiO 2 /PVDF due to the multilevel structured surface roughness. It is a relative low cost and convenient operation method to prepare the superhydrophobic material. The results provide a novel preparation method of the superhydrophobic material and a treatment method of the electrospun PA6 membrane to obtain a stable structure. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48804.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ye Fu,Shulun Ai,Zhiguang Guo,Weimin Liu
By collecting water in the air, it is an important way to solve the problem of water shortage in arid and semi-arid areas. Improving the efficiency of fog harvesting is still a great challenge to be overcome. The use of 3D structure is an excellent strategy, here, a Multiple-biomimetic 3D hydrophilic and superhydrophobic fog harvester with a hump-valley structure was prepared by the combination of thermal processing and spraying. Inspired by biological water collection in nature, a 3D porous sponge surface with hydrophilic valley and superhydrophobic hump was obtained by two-step treatment. This surface structure showed excellent fog harvesting performance, which was 185 % higher than the original sponge. This structure accelerates the capture, transfer and transport of droplets during the fog harvesting process and greatly improves the efficiency of fog harvest. The results show that the chemical gradient and structural gradient actuation we constructed on the melamine sponge surface can effectively improve the fog collection efficiency. A surface with a linear hump-valley mixed wettability pattern is designed, and it is proved that fog collection efficiency can be effectively improved at the droplet capture and transfer stage and transport stage respectively. This study highlights a simple and cheap integrated fog harvester material design.
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
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Sipei Zhao,Changlu Zhou,Zhong Xin
Bacterial invasions pose major challenges to various aspects of human production and daily life, continuous exploration of antibacterial agents and the design of effective antibacterial materials are urgently needed. Herein, based on the diverse biological activity of oxazine compounds, a biobased benzoxazine monomer (PY-f) was successfully synthesized using renewable furfurylamine and pyrogallol as raw materials. The PY-f monomer exhibits excellent antibacterial activity, the relationship between its structural changes during the ring-opening reaction and antibacterial properties was discussed in detail. The experimental results indicate that its antibacterial activity is weakened with the ring-opening ratio of the oxazine ring. It is speculated that the antibacterial mechanism of PY-f is the synergistic effect of the electron-withdrawing oxazine ring and furan ring. Moreover, incorporating PY-f into polyethylene (PE) to create antibacterial polymer materials reveals that the PE/PY-f composites exhibit outstanding antibacterial properties within the processing temperature range of 140–190 °C, along with long-term antibacterial potential. Notably, the evolution of the molecular structure of PY-f during thermal processing brings simultaneous improvements in toughness and modulus to modified PE, as well as interesting surface hydrophilic and hydrophobic conversion. This study validates the effective antibacterial properties of benzoxazines and provides a feasible strategy for the design and development of antibacterial polymers.
研究领域:
材料科学
·
生物医学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Shahid Khan,Shengnan Chen,Yecheng Ma,Mahmood ul Haq,Youduo Li,Mohammad Nisar,Rashid Khan,Yong Liu,Jianxun Wang,Gaorong Han
An ultrasonic assisted spraying method was proposed to prepare TiN films in friendly conditions. The particle size effects of the nano-TiN suspensions upon the film structure, morphology, and optical properties were investigated. The results show that the larger particles (170 nm) form a porous structure, while the smaller ones (60 nm) form a dense structure. Both the films display good thermal stability under 700 °C vacuum annealing. The dense film shows a metal-like behavior of abnormal dispersion in the range over 550 nm, and the annealing process increases the carrier concentration by presenting the red shift of the plasma absorption. The water contact angles of porous films are about 0° and 153° respectively, before and after the annealing process. Such a variation could be attributed to the emerging of TiNO x that reduces the surface activity. The above-stated results demonstrate a promising potential to prepare TiN films by ultrasonic spray method and their applications as super hydrophilic or hydrophobic coatings by control annealing process.
研究领域:
材料科学
·
表面工程
·
物理化学
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Xiaoming Wang,Li Li,Yan Lin,Jin Xu,Jiatao Zhao,Xiaoguang Zhang,Fei Wang,Xiaolin Wang
The use of porous media as a fixed bed for promoting methane hydrate formation has been endowed with great potential in hydrate-based energy storage. In this work, a graphene aerogel (GA) with a one-piece structure and ultralight weight was prepared and adopted for the first time as a fixed bed for methane hydrate formation. In particular, the effects of the filling ratio and hydrophobic–hydrophilic properties of GA on the promotion efficiency were comprehensively investigated. In the range of 84–95%, a lower filling ratio resulted in higher promotion efficiency, which at 84% increased the methane storage capacity and apparent storage capacity from 114.4 ± 7.6 and 52.4 ± 6.7 V/V to 146.3 ± 6.5 and 91.1 ± 13.0 V/V, respectively. Cryo-scanning electron microscopy (Cryo-SEM) demonstrated that the hydrates formed in the inner pores of GA but also revealed the existence of empty pores, indicating that part of the reaction solution migrated out of the GA. Fortunately, by regulating the hydrophilic–hydrophobic properties of GA, the migration of the reaction solution during hydrate growth could be controlled, and the methane storage capacity could be optimized. More importantly, GA produced excellent advantages in terms of gravimetric storage capacity over traditional media and, therefore, produced great potential in serving as an ultralight fixed bed for the industrial application of hydrate-based energy storage.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Ye Niu,JiaoJiao Zhao,Chi Liu,Yi Zhang,JiaJia Pang,Shuo Wang
With the increasing awareness of environmental protection, polysaccharide packaging materials have received widespread attention. In this work, a kind of novel polysaccharide composite membrane was prepared by hollow glass microspheres (HGM) into agar (AG) and sodium alginate (SA) matrix and then cross-linking by glycerol (abbreviated as AG-SA-HGM). The addition of hollow glass microspheres significantly improved the thermal stability and flame retardancy of the polysaccharide membrane, with a peak heat release rate of only 72.05 kW m −2 . Besides, the prepared flame retardant packaging membrane not only has excellent flexibility, no cracks after folding, and can restore its original state, but also exhibits special properties of front hydrophobicity (contact angle of 123.82°) and back hydrophilicity (contact angle of 35.33°). Therefore, AG-SA-HGM composite membrane has great potential in flame retardant applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
He Li,Jinsheng Sun,Kaihe Lv,Xianbin Huang,Pengxin Zhang,Zhen Zhang
Wellbore stability is a complex issue to achieve safe and efficient drilling operations, especially in shale formations using water-based drilling fluids. The objective of this paper is to maintain wellbore stability by wetting reversal of shale with synthesized hydrophobic nanoparticles (HN). The molecular structure and microstructure of HN were studied by Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM), respectively. Experiments were conducted to analyze the particle size, dispersion stability, and thermal stability of HN. The effects of HN on the wettability of the shale surface were investigated by a series of contact angle measurements. The changes of shale microstructure were observed by scanning electron microscopy (SEM). To evaluate the wellbore strengthening performances of HN, spontaneous imbibition measurements and uniaxial compression strength tests were performed. The effect of HN on the base fluid was also evaluated. The results showed that the HN with an average particle size of 217.4 nm was successfully prepared. High temperature slightly promoted the dispersion of HN in water. HN was still relatively stable at 240 ℃. HN was strongly adsorbed on the shale surface to form a hydrophobic layer, which transformed the shale surface from hydrophilic to hydrophobic. Moreover, the ability of HN to cause a wetting reversal of shale was not susceptible to temperature and could be maintained even at ultra-high temperatures. After the HN treatment, the water absorption of shale decreased obviously, and the uniaxial compressive strength increased significantly. In addition, the addition of HN had no significant effect on the rheology and filtration properties of drilling fluids. The HN presents a high application potential as a nano-structured wetting alteration agent to ensure the stability of the wellbore.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xingzhen Zhang,Yuzhang Zhu,Feng Zhang,Yuyue Mo,Yatao Zhang,Wangxi Fang,Jian Jin
Developing a membrane integrating high permeating flux and high separation efficiency for the purification of oil-in-water emulsions is significant but still challenging due to the perm-selectivity “trade-off”. Herein, we design a nanofibrous membrane with special hydrophilic/hydrophobic intercalated multilayer structure to efficiently separate oil-in-water emulsions. The multilayer membrane is composed of alternatively deposited hydrophilic polyacrylonitrile (PAN)/ZnO nanoneedles composite fibers layers and hydrophobic poly(vinylidene fluoride-co- hexa -fluoropropylene) (PVDF-HEP) fibers layers, where vertically grown ZnO nanoneedles pierce through PVDF-HEP fibers layer and connect the whole membrane up and down. The special multilayer structure can exert the synergistic effect between size sieving mechanism of hydrophilic layers and coalescence mechanism of hydrophobic layers during the separation of oil-in-water emulsion, which overcomes the size mismatch between large pore sizes of membrane and small droplets of emulsion. With the mean pore size of 1.1 μm for the multilayer composite membrane, a high permeating flux up to 32,100 L m -2 h −1 bar −1 with the oil content in filtrate as low as 4 mg L −1 for treating toluene-in-water emulsion (a mean droplet size of 650 nm) was achieved. The separation performance is obviously superior to the hydrophilic membrane without hydrophobic layers intercalated structure. Our work provides a new strategy for developing hydrophilic-hydrophobic composite membranes to alleviate the trade-off between permeating flux and separation efficiency in oil/water emulsion separation through rationally designing the membrane structure.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2017
·
IF 4.747
Lingli Deng,Xuefan Kang,Yuyu Liu,Fengqin Feng,Hui Zhang
In this study, the gelatin, zein , and gelatin/zein films were fabricated by electrospinning and solvent casting, respectively. Scanning electron microscopy , differential scanning calorimetry , Fourier transform infrared spectroscopy and water contact angle measurements were performed to characterize the morphology, molecular interactions, thermal behavior, and surface hydrophilicity of the electrospun and casted films. Results showed that the zein particles prevented the gelatin chains from aggregating intra-molecularly in the casted films due to heterogeneous mixing, while strong hydrogen bonding was formed in the nanofibrous film as a result of homogeneous mixing. Interestingly, the gelatin/zein nanofibrous film had a hydrophobic surface (water contact angle of 118.0°), while the casted gelatin/zein film had a hydrophilic surface (water contact angle of 53.5°). The confocal laser scanning microscopy observations suggested that the zein particles were well dispersed in the gelatin network to maintain the nanofibrous structures after immersion in water or ethanol, leading to the improved solvent resistance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）