PROGRESS IN ORGANIC COATINGS
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2023
·
IF 6.6
Wentao Hao,Yangningjie Zhong,Qiong Yang,Chenchen Ke,Yusheng Lu,Wenping Wang,Wen Yang
Polylactic acid (PLA) has great potential to replace traditional petroleum-based polymers, especially in membrane production, due to its biocompatibility, degradability, and renewability. However, there are rare reports of superhydrophobic and breathable PLA membranes. In this work, a multifunctional PDMS/SiO 2 @PLA membrane with superhydrophobicity and breathability was prepared by coaxial electrospinning method to coat the surface of PLA fiber with a thin layer of biocompatible polydimethylsiloxane (PDMS) and nano-silica particles. The prepared membrane has a water contact angle (WCA) of 151.8 ± 1.3° and a water sliding angle (WSA) of 5.7 ± 0.3°. Thanks to its superhydrophobicity, it can support a water column of 195 cm. The membrane has excellent breathability that its water vapor transmission rate is ~14.7 kg·m −2 ·24 h −1 . Moreover, the freezing time of the membrane is 2.25 times longer than that of the original PLA membrane. In addition, it has an oil-water separation efficiency of 99.9 % and a flux of ~12,300 L·m −2 ·h −1 . The overall performance of this multi-functional PDMS/SiO 2 @PLA membrane is one of the best among the fluorine-free electrospun membranes.
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INDUSTRIAL CROPS AND PRODUCTS
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2023
·
IF 5.9
Huicheng Dou,Ying Zhang,Hao Zhang,Yanan Wang,Jiaxing Li,Hao Zhong,Xueqi Chen,Minghui Guo
Water pollution caused by crude oil spills poses significant environmental concerns. In this work, multi-walled carbon nanotubes (MWCNTs) were dispersed as the carbon network on the elastic wood sponge (WS) and then encapsulated by hydrophobic polydimethylsiloxane (PDMS) coating to form a crude oil adsorbent, PDMS@CNT-WS. It demonstrated an elasticity of up to 90% compressive strain, while the height retention remained at 97% even after 100 cycles at 50% compressive strain. The shape-memory properties and 148°hydrophobic angle of the material allowed it to be repeatedly used. This is the first material to utilize sunlight and microwave as dual stimuli to absorb and recover spilled crude oil. PDMS@CNT-WS absorbed crude oil floating on water within about 80 s under 1 sun illumination. After condensation, the material was heated within only 4 s in a microwave oven at 2450 MHz, and the crude oil in the interior could be recovered by simply squeezing the material. This new approach provided a source of energy conversion for crude oil adsorbents with thermal management capabilities to clean up crude oil spills.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 40
·1-12
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IF 3
Yongxu Li,Fang Guo,Hairui Wang,Yongyin Cui,Cancai Wang,Qingfu Wang,Lan Cao
Tooth extraction will leave a wound that may cause blood leakage, and the application of liquid-absorbing hemostatic cotton pressed on the wound can play the effect of pressure to halt bleeding. Unfortunately, the loose structure of the dental absorbent hemostatic cotton causes local slag to fall. Cotton fiber will impede wound heading and possibly drop into the throat and esophagus, thus impacting the life and health of the patient. Therefore, it is of great significance to prepare a material with toughness and high liquid absorption. The polyurethane foams (PUFs) with different chain extension coefficients synthesized from polyether polyol and diphenylmethane diisocyanate (MDI) with water as the blowing agent have excellent toughness and liquid-absorbing properties with potential applications. The hydrophilic polyethylene glycol (PEG) is introduced into the polyurethane chain segment to form a synergistic effect with the three-dimensional foam network structure to absorb more wound exudate. The hydrophobic PUFs can be applied to wounds with less exudate and the hydrophilic PUFs can be applied to chronic wounds with more exudate. The porous structure gives the PUF a strong loading capacity and promotes the wound-healing effect. The PUFs exhibit good liquid absorption/retention performance in both 0.9 wt% NaCl solution and DI water, especially PUF-1.10 has an ultimate DI water absorbency of nearly 840%. According to the performance, comparison of the current market commonly used dental absorbent hemostatic cotton; PUF-1.10 is considered a promising candidate for replacing traditional dental commercial absorbent hemostatic slag-fall cotton in liquid absorption/retention and mechanical properties.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Huiying Xiang,Yuan Yuan,Tao Zhu,Xu Dai,Cheng Zhang,Yu Gai,Ruijin Liao
The icing of transmission conductor seriously threatens the safe operation of power grids. Slippery lubricant-infused porous surface (SLIPS) has shown great potential for anti-icing applications. However, aluminum stranded conductors have complex surfaces, and the current SLIPSs are almost prepared and studied on small flat plates. Herein, the construction of SLIPS on the conductor was realized through anodic oxidation and the anti-icing mechanism of the slippery conductor was studied. Compared to the untreated conductor, the SLIPS-conductor reduces the icing weight by 77% in the glaze icing test and shows very low ice-adhesion strength (7.0 kPa). The excellent anti-icing performance of the slippery conductor is attributed to the droplet impact dynamics, icing delay, and lubricant stability. The dynamic behavior of water droplets is most affected by the complex shape of the conductor surface. Specifically, the impact of the droplet on the conductor surface is asymmetric and the droplet can slide along the depression in low-temperature and high-humidity environments. The stable lubricant of SLIPS increases both the nucleation energy barriers and the heat transfer resistance, which greatly delays the freezing time of droplets. Besides, the nanoporous substrate, the compatibility of the substrate with the lubricant, and the lubricant characteristics contribute to the lubricant stability. This work provides theoretical and experimental guidance on anti-icing strategies for transmission lines.
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POLYMER DEGRADATION AND STABILITY
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2023
·
IF 5.9
Ying-Ming Li,Wen-Juan Hu,Shuang-Lin Hu,Yi-Ran Li,Dan-Ping Zhu,De-Yi Wang
The rigid polyurethane foam (RPUF) with excellent flame retardancy, high compressive strength and good thermal insulation performance is of great importance to its widely application, especially the application in high-rise building exterior wall materials. In this work, two kinds of flame-retarding polyols (DADP and APDP) containing phosphorus and nitrogen elements were prepared via a simple salinization reaction and reacted into RPUF chains. When only 15 wt% of APDP was incorporated, the material passed the UL-94 V-0 rating with a limiting oxygen index (LOI) of 24.5% while 20 wt% of DADP incorporated to realize the same flame-retarding effect. For the RPUF/APDP 15 , the peak heat release rate (PHRR) decreased by 28.2% comparing to the neat RPUF and the fire growth rate (FIGRA) was the lowest 8.3, indicating the lowest flame spread speed among all the flame-retarding RPUF. The compressive strength of the RPUF/APDP 15 material increased by 41.8% comparing to that of neat RPUF, mainly causing by the good compatibility and the enhancement of hardness of polyurethane via the benzene ring. Moreover, it was concluded that the gas-phase mechanism dominated in enhancing the flame-retarding effect for the RPUF material, and the APDP showed a higher flame-retarding effect with a higher content of phosphorus and nitrogen elements than that of DADP.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dan-Dan Hu,Yi-Dong Li,Yunxuan Weng,Hua-Qiao Peng,Jian-Bing Zeng
Currently reported biobased superwetting cotton fabrics (CF) for wastewater purification were limited because they can only separate oil/water mixtures but cannot remove other pollutants such as dyes from wastewater. In this study, we reported a superhydrophilic and underwater superoleophobic cotton fabric (SUSCF) which was fabricated via a facile two-step method, i.e., dip-coating in poly(sodium 4-styrenesulfonate) (PSS) wrapped carbon nanotube (CNT) dispersion and subsequent in-situ deposition of polydopamine (PDA). The deposited PDA particles and coated CNT endowed CF with superhydrophilicity and underwater superoleophobicity by improving surface roughness and hydrophilicity. The obtained SUSCF showed an underwater oil contact angle of 160°, which made it an attractive water-removing material for oil/water separation with separation efficiency and water flux of higher than 99.8% and 10,834 L m -2 h −1 , respectively. The combination of CNT, PSS, and PDA endowed the SUSCF with outstanding cationic dye adsorption capacity, especially leading to a maximum removal ratio of 97% toward methylene blue. In addition, the SUSCF exhibited excellent stability to survive after exposure to sandpaper abrasion, boiling water, organic solvents, salt solution, and acidic/alkali erosion, due to the strong hydrogen bonds and mussel-inspired adhesion between coated components and fabric surface. The stable biobased underwater superoleophobic cotton fabric with integrated excellent oil/water separation performance and dye adsorption capacity shows great potential in wastewater purification even under some harsh conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guodong Zhang,Runcheng Zhang,Yaning Kong,Fei Wang
It was recently found that halogen salts can facilitate hydrate formation at low concentrations, and this finding provides new ideas on hydrate-based adsorption-hydration natural gas (AHNG) technology by using diluted seawater so as to save fresh water. However, complicated hydrate formation kinetics was commonly anticipated due to ion specific effect, while porous surface further enhances the effect. To improve the understanding of the synergy of ion specific effect and porous surface on hydrate formation kinetics, hydrate formation loaded by activated carbon (AC) in the presence of 4 halogen salts was carried out. It was found that both of promotion and antagonism effect appears in the ion-porous surface system, KI performs the best on promoting hydrate nucleation, and hydrate induction period even disappears when 0.05 wt% KI was applied. In contrast, 0.1 wt% NaCl enhances methane storage capacity and performs excellent at high water contents, and an average increase of 9.6 V/V in methane storage capacity was obtained for different water contents. The promotion mechanisms of specific ions on hydrate formation were speculated, and I − and Na + were found to perform better on enhancing hydrate nucleation and conversion, respectively. I − can induce interfacial hydration shells to promote hydrate nucleation, while the porous surface significantly increases gas–liquid contact area and enhance the promotion, and Na + improves water-to-hydrate conversion in confined porespace due to ion selection induced by confinement.
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Gels
·
2023
·Vol. 9
·期 5
·405
·
IF 4.6
Feng Liu,Xin Di,Xiaohan Sun,Xin Wang,Tinghan Yang,Meng Wang,Jian Li,Chengyu Wang,Yudong Li
The persistent challenge of removing viscous oil on water surfaces continues to pose a major concern and requires immediate attention. Here, a novel solution has been introduced in the form of a superhydrophobic/superoleophilic PDMS/SiO2aerogel fabric gathering device (SFGD). The SFGD is based on the adhesive and kinematic viscosity properties of oil, enabling self-driven collection of floating oil on the water surface. The SFGD is able to spontaneously capture the floating oil, selectively filter it, and sustainably collect it into its porous fabric interior through the synergistic effects of surface tension, gravity, and liquid pressure. This eliminates the need for auxiliary operations such as pumping, pouring, or squeezing. The SFGD demonstrates exceptional average recovery efficiencies of 94% for oils with viscosities ranging from 10 to 1000 mPa·s at room temperature, including dimethylsilicone oil, soybean oil, and machine oil. With its facile design, ease of fabrication, high recovery efficiency, excellent reclaiming capabilities, and scalability for multiple oil mixtures, the SFGD represents a significant advancement in the separation of immiscible oil/water mixtures of various viscosities and brings the separation process one step closer to practical application.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Xueyou Sun,Jingwen Shi,Xiangdong Men,Yanna Li,Hemi Qu,Ye Chang,Jizhou Hu,Xu Yan,Wenlan Guo,Chen Sun,Xuexin Duan
Micro gas chromatography (μGC) using microfabricated silicon columns has been developed in response to the requirement for portable on-site gas analysis. Although different stationary phases have been developed, repeatable and reliable surface coatings in these rather small microcolumns remains a challenge. Herein, a new stationary phase coating strategy using magnetic beads (MBs) as carriers for micro column is presented. MBs modified with organopolysiloxane (MBs@OV-1) and a metal organic framework (MBs@HKUST-1) are deposited in on-chip microcolumns assisted with a magnetic field with an optimized modification process. MBs@OV-1 column showed a minimum HETP of 0.074 cm (1351 plates/m) of 62 cm/s. Mixtures of volatile organic compounds are successfully separated using MBs carried stationary phase which demonstrates that this technique has good chromatographic column efficiency. This method not only provides a novel coating process, washing and characterization of the stationary phases but also establishes a straightforward strategy for testing new absorbent materials for μGC systems.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xiao Wang,Si Chen,Rui Ding,Nan Zhou,Yan Zheng,Hai-bin Yu,Bin-jun Li,Tai-jiang Gui,Wei-hua Li
Gallic acid-based epoxy resin monomer was synthesized by the natural extract of gallnut for the efficient dispersion of graphene in epoxy resin. The graphene zinc-rich anticorrosion coatings were further prepared on the basis of the graphene / gallic acid-based epoxy resin monomer dispersion system. Electrochemical experiments and spectral characterization were carried out to study the effect of graphene on zinc-rich coatings and its mechanism. Experiments showed that graphene enhanced the cathodic protection currents of the zinc-rich coatings and prolonged the cathodic protection time. Simultaneously, graphene slowed down the penetration of corrosive media into the coatings. The conductivity of graphene improved electrical contact between zinc particles as well as zinc and iron, and transformed un-activated zinc particles into activated zinc particles. The dispersed and layered structure of the graphene extended the permeation path of the corrosive medium, which resulted in reduced permeation rate and decreased water content of the coatings. It was demonstrated by the tracking of zinc corrosion products by micro-area Raman spectroscopy.
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DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2023
·
IF 3.4
Yizhe Hou,Xi Wang,Zhiyong Zhang,Jiaheng Wu,Xiang Cai,Pian Li,Zheng Li,Wenlong Li
Objective The drooping process of the Xuesaitong dropping pills (XDPs) was optimized based on quality by design concept. Meanwhile, a machine vision (MV) technology was creatively introduced in this study to predict the critical quality attributes (CQAs) rapidly and accurately.Significance This study improves the understanding of dropping process, and has reference value for the guidance of pharmaceutical process research and industrial production.Methods The study mainly consisted of three stages: the first stage involved the prediction model to establish and evaluate the CQAs, and the second stage involved assessing the quantitative relationships between critical process parameters (CPPs) and CQAs by the mathematical models that were established through the Box–Behnken experimental design. Finally, a probability-based design space for the dropping process was calculated and verified according to the qualification criteria of each quality attribute.Results The results show that the prediction accuracy of the random forest (RF) model was high and met the analysis requirements, and the CQAs of dropping pills can meet the standard by running in the design space.Conclusion The MV technology developed in this study can be applied to the optimization process of the XDPs. In addition, the operation in the design space can not only ensure the quality of XDPs to meet the criteria, but also help to improve the consistency of XDPs.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 43
·2304459
·
IF 19
Haoyu Dai,Linfeng Yang,Yaping Feng,Junhan Sun,Fenglin Chen,Xianfeng Luo,Zengyi He,Xuetao Xu,Bing Wang,Xubo Liu,Zhichao Dong,Lei Jiang
Emulsified oil leakage onto the bulk water surface causes severe issues on global ecology and health. Developing efficient, rapid, and universal separation methods of emulsions has been a significant topic in scientific studies. However, a contactless and additive-free strategy to achieve continuous floating emulsion separation and oil collection remains to be discovered. Herein, a universal contactless demulsification, transportation, and collection method to dispose floating emulsions by ionic wind, which contains active charged particles generated by corona discharge is reported. The splash-like demulsification process of floating emulsions is attributed to the rupture of water film enveloped on oil droplet surface, simultaneously and respectively. The evidence of this process recorded by a high-speed camera with 20 000 fps has a referential significance for other works. This study may clean up universal floating emulsions discharged on water in real situations such as oil stations, chemical plants, and restaurants, and furthermore increase the potential of remote control in liquid dynamics by corona discharge.
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危险品化学品经营许可证（带存储）