CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fang Wang,Chun-Bo Li,Ren-Yi Sun,Fei Song,Wei Yang,Yu-Zhong Wang
Environmentally robust super-repellent and flame-retardant materials satisfying various functional necessities under harsh weather events to provide protections from fouling and burn injuries have proven challenging to attain. Here, a unique four-tier hierarchical macro/micro/nanostructure is designed and constructed by regulating the accretion of multiscale organic–inorganic hybrid building blocks using silica nanoparticles, microsized ammonium polyphosphate, fluorinated alkyl silane and fluorocarbon surfactants, leading to appreciable self-cleaning, antifouling and anti-icing properties in addition to excellent flame retardancy. The fabricated rough surface exhibits super-repellency to a variety of liquids, including synthetic blood, edible oil, hexadecane, concentrated H 2 SO 4 , and even dodecane. The hierarchy of the surface texture is found to be decisive for satisfactory liquid repellency and weather resistance. In addition, the coated fabric presents an enhanced buoyancy which could load 40.2 times its own weight in water and demonstrates a favorable icing delay time of 1168 s. Various stability tests show that the coating maintains a good nonwetting state even under harsh conditions, including mechanical abrasions, repeated washing, chemical corrosion, heat treatment, and strong ultraviolet irradiation. Thus, this work provides a feasible and sustainable strategy for constructing multifunctional protective materials used in advanced protective clothing, infrastructure and transportation facilities.
研究领域:
材料科学
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环境科学
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纺织工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Tahereh Seifi,Ali Reza Kamali
The dispersibility and floatability of graphitic carbon materials in water are two contradictory properties with significant importance in a wide variety of applications. Here, we investigate the effect of ball-milling (BM) in the presence of NaCl and n-hexane on the dispersibility and floatability of graphite flakes in water. The exfoliated carbons are characterized by different techniques including the ultraviolet-visible (UV-Vis) absorption and Fourier-transform infrared spectroscopy (FTIR), as well as Raman and X-ray diffraction (XRD) analysis. The increase in the defect density of carbons caused by the BM process, and the presence of n-hexane influence the behavior of exfoliated flakes in water. While the BM at shorter time periods enhances the dispersion performance, the ball-milled graphite is found to be readily floatable on the surface of water at longer BM durations in the presence of sufficiently high amounts of n-hexane used during the BM process. The mechanochemical mechanism involved in enhancing the dispersibility and floatability of graphitic carbon materials is discussed. Furthermore, the enhanced water evaporation performance of the water-floatable carbon prepared by the mechanochemical approach is demonstrated. This article suggests a facile and potentially scalable approach for the preparation of floatable graphene flakes with enhanced performance as free-standing media for light-induced water evaporation applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Wang Jian,Zhang Jiahe,Li Yang,Xia Xinghui,Yang Hengjing,Kim Jae-Hong,Zhang Wen
Photocatalytic water disinfection technology is highly promising in off-grid areas due to abundant year-round solar irradiance. However, the practical use of powdered photocatalysts is impeded by limited recovery and inefficient inactivation of stress-resistant bacteria in oligotrophic surface water. Here we prepare a floatable monolithic photocatalyst with ZIF-8-NH 2 loaded Ag single atoms and nanoparticles (Ag SA+NP /ZIF). Atomically dispersed Ag sites form an Ag−N charge bridge, extending the lifetime of charge carriers and thereby promoting reactive oxygen species (ROS) generation. The photothermal effect of the plasmonic Ag nanoparticles reduces the bacterial resistance to ROS and impairs DNA repair capabilities. Under sunlight irradiation, the synergistic effect of Ag single atoms and nanoparticles enables 4.0 cm 2 Ag SA+NP /ZIF to achieve over 6.0 log inactivation (99.9999%) for the stress-resistant Escherichia coli ( E. coli ) in oligotrophic surface water within 30 min. Furthermore, 36 cm 2 Ag SA+NP /ZIF is capable of disinfecting at least 10.0 L of surface water, which meets the World Health Organization (WHO) recommended daily per capita drinking water allocation (8.0 L). This study presents a decentralized and sustainable approach for water disinfection in off-grid areas.
研究领域:
环境科学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 24
·2300308
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IF 19
Haonan Li,Yijing Yang,Xun Zhu,Hong Wang,Dingding Ye,Yang Yang,Qiang Liao,Rong Chen
Flexibly and precisely controlling bubbles is of paramount significance for biological and chemical analysis, reaction engineering, etc. However, the buoyancy force acting on bubbles is significant, making it difficult to precisely manipulate bubbles. Particularly, controlling the anti-buoyancy motion of bubbles remains a fundamental challenge. Herein, a versatile light strategy for manipulating the anti-buoyancy motion of bubbles via a photosensitive substrate is developed. Upon focused laser beam irradiation, an intense Marangoni effect associated with non-uniform temperature distribution is induced underneath the bubble. The created excess Laplace pressure drives the bubble to move against the buoyancy force downward to the focused-laser-acted region, manifesting an excellent phototaxis motion. Theoretical analysis demonstrates that the Marangoni effect is responsible for actuating the anti-buoyancy motion of a bubble. With this light strategy, the bubble collection, transportation, and on-demand release can be flexibly implemented. Moreover, the phototaxis motion of bubbles inspires a manipulation protocol via the integration of 3D-structured design of photosensitive substrate. This light strategy for manipulating bubbles not only possesses sufficiently high accuracy and quick response, but also circumvents the limitation of the liquid volatility and multi-dimensional motion, which provides new ideas for rational control of bubble behaviors.
研究领域:
物理学
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化学工程
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生物分析
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Siyu Sheng,Bairu Shi,Cheng Wang,Liang Luo,Xiao Lin,Pengsong Li,Fanhong Chen,Zhicheng Shang,Hong Meng,Yun Kuang,Wen-Feng Lin,Xiaoming Sun
The bubbles electrochemically generated by gas evolution reactions are commonly driven off the electrode by buoyancy, a weak force used to overcome bubble adhesion barriers, leading to low gas-transporting efficiency. Herein, a Janus electrode with asymmetric wettability has been prepared by modifying two sides of a porous stainless-steel mesh electrode, with superhydrophobic polytetrafluoroethylene (PTFE) and Pt/C (or Ir/C) catalyst with well-balanced hydrophobicity, respectively, affording unidirectional transportation of as-formed gaseous hydrogen and oxygen from the catalyst side to the gas-collecting side during water splitting. “Bubble-free” electrolysis was realized while “floating” the Janus electrode on the electrolyte. Antibuoyancy through-mesh bubble transportation was observed while immersing the electrode with the PTFE side downward. The wettability gradient within the electrode endowed sticky states of bubbles on the catalyst side, resulting in efficient bubble-free gas transportation with 15-fold higher current density than submerged states.
研究领域:
电化学
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材料科学
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表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Guo Yu,Peilin Han,Hongmei Yi,Jiaxiang Zhao,Songjia Hou,Zuoyi Yan,Jie Liu,Haohong Li,Huidong Zheng,Caijin Zhou
The low efficiency of growing single-walled carbon nanotubes (SWCNT) poses a barrier to their application in high-performance electronic devices. However, it is difficult to control the uniform growth of SWCNT in a floating catalytic reactor due to the complex parameter control. Therefore, it is essential to enhance the growth of SWCNT in the floating catalyst chemical vapor deposition (FCCVD) process. In the present work, the influence of the reactive flow field on the growth of SWCNT, which is often neglected, is revealed. To address this issue, this work combines experiments and simulations to obtain the characteristics of the field distribution within the reactor and the trend of the products. The results of the flow field analysis indicate that thermal buoyancy is the cause of SWCNT growth limitation in FCCVD. By weakening the thermal buoyancy, a homogeneous reaction field is obtained; vortices in the flow field are reduced or even disappear; the temperature field is more homogeneous, and, importantly, the crystallinity of SWCNT is enhanced (I G /I D up to 20-fold). In addition, the decomposition process of the carbon source is also enhanced, thus suppressing the generation of by-products. Based on the results of the small tube experiments, both the increase in temperature and the decrease in residence time increased the I G /I D . Furthermore, the distributions of the maximum and minimum diameters in SWCNT imply variations in the growth modes of SWCNT at different temperatures.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 28
·13661-13672
·
IF 7.233
Wei Jiang,Hongyan Fu,Yingming Zhu,Hairong Yue,Shaojun Yuan,Bin Liang
In this research, a controlling mechanism of particle size on the wettability of Ag2O particles is reported, and an interesting floatable Ag2O photocatalyst with superhydrophobicity and superoleophilicity is prepared based on this mechanism. Stable superhydrophobic and superhydrophilic Ag2O without a low-surface-energy modifier can be obtained only by adjusting its particle size, and its wettability can switch mutually by changing the particle size. The wettability of Ag2O converts from superhydrophilic to hydrophobic when the average particle size is more than 1.08 μm. The operation parameters of the Ag2O crystallization process significantly influence the wettability of the Ag2O particles. The obtained superhydrophobic Ag2O floated on the water surface, and exhibited excellent photodegradation performance with various floating oils. This attractive superhydrophobic Ag2O photocatalyst is promising for practical applications, and provides a strategy for the development of functional photocatalysts and superhydrophobic materials.
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guanzhou Luo,Lanfang Wen,Kai Yang,XinYing Li,Shouping Xu,Pihui Pi,Xiufang Wen
A robust and durable fluorinated 8-MAPOSS-based superamphiphobic fabric (Fabrics-S-MAPOSS-F) was obtained by in situ grafting of 3-Mercaptopropyltriethoxysilane (MPTES), 8-Methacryl polyhedral oligomeric silsesquioxane (8-MAPOSS) and 2-(perfluorooctyl) ethyl methacrylate (FMA) on a cotton fabric. The micropores and mesopores bonding structure with low surface energy on the as-prepared Fabrics-S-MAPOSS-F can capture air, endowing the fabric antifouling, self-cleaning, dehydration resistance, buoyancy boost, drag reduction performance, as well as good durability after UV irradiation, mechanical damage, 300 °C oven heating for 2 h and separately immersion in acid/base/salty solution, even in 98% H 2 SO 4 for 30 min. The Fabrics-S-MAPOSS-F can float on the surface of water or blended oil effortlessly with loading 18.8 times and 15.6 times its own weight of SiO 2 powder, respectively. Compared to untreated fabric, the Fabrics-S-MAPOSS-F exhibits a sailing velocity boost by nearly 2.5 times in both water and blended oil. The drag reduction rate is as high as ~154.7%. This novel smart Fabrics-S-MAPOSS-F can be considered a promising material in life jacket, special garments, package protection or smart device.
研究领域:
材料科学
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纺织工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Xi Chen,Hang Liu,Yicheng Yang,Pengfei Li,Xingru Wang,Kai Zhang,Kaifang Zeng,Jian Ming,Xiaojuan Lei
Floating delivery system enhances bioavailability of bioactive substances by extending their upper gastrointestinal absorption window. Proanthocyanidins offer various health benefits but have low bioavailability due to high sensitivity and low solubility under intestinal conditions. Based on the noneffervescent multiple-unit floating delivery system, this study developed proanthocyanidins-loaded chitosan-starch floating emulsion gel beads (S-CS-PC) through emulsification and extrusion to improve proanthocyanidins bioavailability. FTIR, XRD and XPS analyses revealed interactions between chitosan and starch. SEM showed the distribution of oil phase and well-developed porous structure within the gel beads. Simulated gastric release profile of proanthocyanidins showed S-CS-PC prevented initial burst release observed in pure chitosan gel beads and achieved sustained release. Additionally, S-CS-PC demonstrated significant antioxidant capacity and antibacterial activity, maintaining stability and functionality of encapsulated bioactive substances. This straightforward method with greater scalability and cost-effectiveness, renders the delivery system suitable for industrial-scale production and potential use in functional foods and dietary supplements.
研究领域:
食品科学
·
药剂学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhecun Wang,Yubing Shao,Tianyi Wang,Jinghan Zhang,Zhanyuan Cui,Jing Guo,Shenghai Li,Yaohan Chen
Current single-function superwettable materials are typically designed for either oil removal or water removal and are constrained by oil density, limiting their widespread applications. Janus membranes with opposite wettability on their two surfaces have recently emerged and present attractive opportunities for on-demand oil/water emulsion separation. Here, a combination strategy is introduced to prepare a Janus membrane with asymmetric superwettability for switchable oil/water emulsion separation. A mussel-inspired asymmetric interface introduction cooperating with the sequence-confined surface modification not only brings about an asymmetric superwettability Janus interface but also guarantees an outstanding stable interface and remarkable chemical stability surfaces. Specifically, the superhydrophilic surface with underwater superoleophobicity can separate surfactant-stabilized oil-in-water emulsions. Conversely, other surface displays opposite superhydrophobicity and superoleophilicity to treat surfactant-stabilized water-in-oil emulsions. Significantly, this superwettable Janus membrane presents superior long-term on-demand oil/water emulsion separation without obvious flux decline and high recovery ability because of its superwettability and superior stability. Furthermore, the asymmetric superwettability enhances the interfacial floatability at air–water interfaces, enabling the design of advanced interfacial materials. The as-prepared superwettable Janus membrane has established a cooperated separation system, overcoming the monotony of conventional superwettable membranes and expanding the application of these specialized membranes to oily wastewater treatment.
研究领域:
材料科学
·
环境工程
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
·
IF 4.527
Peng Gu,Qi Li,Weizhen Zhang,Zheng Zheng,Xingzhang Luo
Eastern China is a typical region that suffers from harmful cyanobacterial blooms. Numerous studies have focused on bloom formation mechanisms; however, the detailed mechanisms remained unclear. Our study explored the influence of four metal ions (Ca, Cu, Pb and Cd) on Microcystis aeruginosa to determine their effects on bloom formation. We found that Ca concentrations higher than 100 mg L −1 contributed to cyanobacterial bloom formation. The presence of Ca triggered the anti-oxidation process and promoted the secretion of extracellular polysaccharides , thus inducing aggregation of algal cells and enhancing their buoyancy 2.1-fold more than the control ( p ＜0.05). The reverse regulation of dissolved CO 2 to bicarbonate by carbonic anhydrase formed a large amount of carbonate and decreased the growth rate by 38–56%. Cu (>0.1 mg L −1 ) presented significant toxicity to algal cells while Pb (>1 mg L −1 ) suppressed the algal growth rate due to the acidic condition. Cd (<0.1 mg L −1 ) exhibited no apparent toxicity to the algae. Furthermore, as the buoyancy increased, Cd was likely to facilitate the formation of cyanobacterial blooms, which needs further research. These findings can provide a theoretical basis for eutrophic lake management and contribute to the development of water quality and wastewater discharge standards.
研究领域:
环境科学
·
水生生态学
·
水资源管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Chao Hu,Huaili Zheng,Rui Zhao,Shixin Zhang,Qiang Sun,Junyi Jiang,Yongjun Sun
The solid-liquid separation ability of adsorbents is of great significance for improving the recovery efficiency and reducing the cost. Herein, a novel floating-magnetically responsive silica adsorbent (FMSA) was prepared and applied to the adsorption of cationic dyes from aqueous solution. FMSA with self-floating and magnetic response properties exhibited great solid-liquid separation ability and adsorption performance for cationic dyes. According to the Langmuir model, the theoretical saturated adsorption capacity of FMSA for Basic Blue 7 (BB-7) and Crystal Violet (CV) reached 1632.55 mg g −1 and 1587.23 mg g −1 , respectively. Thermodynamic experiments manifested that the adsorption was a spontaneous endothermic process with increasing entropy. After 5 adsorption-desorption processes, FMSA’s adsorption capacity for BB-7 and CV remained above 80%, indicating that it has satisfactory stability and reusability . Furthermore, the pH effect, isotherm, kinetics, ion interference experiments and characterization analysis manifested that the adsorption was mainly chemical adsorption with an ion exchange process. This research aims to bring some inspiration for the combined use of floating separation and magnetic separation to achieve more flexible, efficient and energy-saving solid-liquid separation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）