Frontiers in Materials
·
2024
·
IF 2.6
Fang Yunhui,Wang Zhaopeng,Yan Dongming,Lai Huazhen,Ma Xiuxing,Lai Junying,Liu Yi,Zhong Lina,Chen Zhanhua,Zhang Xiaofang,Lin Zhijun,Wang Dongye
A series of polycarboxylate superplasticizers (PCEs) with different side-chain densities, main chain polymerization degrees, and side-chain lengths were designed and synthesized using a novel highly active ethylene glycol mono vinyl ether polyethylene glycol as the ether monomer. The influence of polycarboxylate ether on the rheological properties, interface adsorption, and hydration characteristics in cement paste was investigated through characterization of charge density, rheological properties, adsorption behavior, and hydration heat. The results indicate that the adsorption process of PCE on cement particles is spontaneous physical adsorption, and the hydration kinetics fitting reveals that the geometric crystal growth exponent n is in the range of 1–2, with needle-like and lamellar hydration products formed. With a decrease in side-chain density, the broadening of molecular weight distribution and the increase of charge density accelerate the flow of slurry, reduces saturation adsorption, and delays cement hydration. A decrease in main chain polymerization degree results in a downward trend in molecular weight and charge density, leading to larger molecular conformations, reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. As the side-chain length of PCE (molecular weight) increases, the charge density decreases, and the molecular conformation exhibits a compact structure with reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. In cases of low side-chain density, short side chains, and low molecular weight, enhanced adsorption capacity and faster adsorption rates are observed, resulting in the lower viscosity and a delay in the cement hydration process.
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
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 4
·e70082
·
IF 3.4
Menghan Zhong,Qiwei Zheng,Ziyun Li,Shengwei Fang,Renfeng Zhou,Chao Wang,Yanlin Ye,Min Xia,Huagang Ni,Yanrong Jia,Peng Ye
Due to the discharge of oily wastewater and oil extraction activities, the oil content and soluble pollutants in water bodies are increasing, causing serious damage to the environment. Therefore, materials with superhydrophilicity and underwater superhydrophobicity have attracted much attention in the field of oil–water separation. In this study, a graphene oxide (GO) brush (polyacrylic acid [PAA], grafted on GO) high-efficiency hydrogel oil–water separation membrane with superhydrophilicity in air and superhydrophobicity under water was prepared by regulating the hydrophilicity through nano-microstructures. Vacuum-assisted filtration was utilized to prepare GO brushes into membranes. Due to the good hydrophilicity of PAA chains, grafting them onto GO sheets enhanced the hydrophilicity of the membranes and increased the surface roughness. This modification significantly increased the pure water flux of the membrane (maximum value of 428.56 L m −2 h −1 bar −1 ). With the synergistic effect of hydration capacity and layered nanostructures, the GO-PAA membrane possesses superhydrophobic and underwater superoleophobic properties. As a result, the oil–water separation rate of GO-PAA2 membrane was greater than 99.12%, which could realize the separation of various oil–water emulsions. Compared with the pristine GO membranes, the graphene brush membranes formed after PAA chain-branch polymerization have higher stability and durability, stronger hydrophilicity, higher oil–water separation efficiency, and better application prospects.
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
ACS Omega
·
2024
·
IF 3.7
Fengzhen Zhang,Ranhao Wu,Huanhuan Zhang,Yuling Ye,Zhong Chen,Aiai Zhang
Edible oil is essential for people’s daily life but also results in a large amount of oily wastewater simultaneously. Oil–water separation is a practical route that can not only purify wastewater but also recycle valuable edible oil. In this study, the superhydrophobic copper mesh (SCM) was prepared by chemical etching, and a novel oil–water centrifugal device was designed for high-efficiency separation of edible oil wastewater. The kernel is a self-prepared SCM, which has a water contact angle (WCA) of 155.1 ± 1.8° and an oil contact angle (OCA) of 0°. Besides, the separation performance of the SCM for edible oil–water mixtures was studied in this study. The results showed that the SCM exhibited excellent oil/water separation performance, with a separation efficiency of up to 96.7% for sunflower seed oil–water wastewater, 93.3% for corn oil–water wastewater, and 98.3% for peanut oil–water wastewater, respectively. Moreover, the separation efficiency was still over 90% after 18 cycles. A model was established to analyze the oil–water separation mechanism via centrifugation. The oil–water centrifugal separation device has great potential for scale-up applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 10
·3390-3399
·
IF 2.573
Yanping Duan,Guangli Dong,Ruijie Wu,Xia Zhao,Mingwei Li,Fengfeng Zhang,Zhimin Song,Hong Hao
Oil contamination is problematic in subaqueous environments. Here, a cationic poly(N,N-dimethyl-N-(ethoxycarbonylmethyl)-N-[2′-(methacryloyloxy)ethyl]- ammonium chloride) (PCBMAE) was synthesized, and a one-step approach of dopamine-assisted codeposition was used to generate PCBMAE/polydopamine (PDA) superhydrophilic and underwater superoleophobic coatings coated on a stainless steel mesh for oil/water separation. The structures, surface morphologies, and properties of the coatings were analyzed by IR, SEM, TGA, and contact angle measurements. During deposition at a PCBMAE and DA mass ratio of 1:1, PCBMAE/PDA mixture particles uniformly adhered to the skeletons of the mesh, increased the surface roughness, created enriched surface micro/nanostructures, and reduced the surface energy of the coating. This endowed the metal mesh with superhydrophilicity and underwater superoleophobicity (oil contact angle 163°) without blocking the mesh, and the deposition density was 0.26 mg/cm 2 . The separation efficiency of the coated mesh was 99.6% for the first castor oil/water separation and dropped to 98.0% after 5 cycles. After 25 cycles, the separation efficiency was still higher than 95%. The PCBMAE/PDA codeposited mesh exhibited high oil/water separation efficiency, stable mechanical properties, and weather stability under different harsh environments, making it a promising separation material for future industrial applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 52
·2410616
·
IF 18.5
Chao Fu,Luqi Liu,Chenchen Xu,Ping Tao,Yuequan Yang,Liquan Lu,Zhixiang Zeng,Tianhui Ren
Porous hydrogels have been developed to be highly efficient interfacial solar vapor generation materials for obtaining affordable freshwater supplies. However, realizing hydrogel materials with portability, adequate water supply, and durable mechanical properties remains challenging. Herein, a scalable and portable hydrogel with 3D-shaped recovery, highly efficient water transport, and robust mechanical stability is reported, which is prepared by foaming polyvinyl alcohol (PVA) and modification of phosphotungstic acid (PTA). Due to the interconnected porous structure and highly permeable polymer network, the PVA/PTA-PH hydrogel has good repetitive compressibility and rapid shape recovery when in contact with water. Combined with light-absorbing nanoparticles, the PVA/PTA-PH hydrogel presents an impressive solar evaporation rate of 3.876 kg m −2 h −1 and a photothermal conversion efficiency of ≈94% under 1-sun irradiation. With 3D-shape recovery and highly efficient water transport, the compressed hydrogel can be quickly unfolded without human intervention and restored to five times the original size for the working state. The good portability, excellent seawater desalination performance, and simple preparation process are anticipated to make the PVA-/PTA-PH hydrogel a promising material to continuously and conveniently produce pure water from seawater.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 13
·1919
·
IF 4.7
Yang Lyu,Weipeng Sun,Tingyou Feng,Wenge Li,Yong Jiang,Chenglin Zuo,Shuangxi Wang
Steel structures located in subtropical marine climates face harsh conditions such as strong sunlight and heavy rain, and they are extremely corroded. In this study, a waterborne coating with excellent corrosion resistance, hydrophobic ability, high-temperature resistance and high density was successfully prepared by using modified nanoscale titania powders and grafted polymers. The effects of three modifiers on titania nanoparticles and waterborne coatings’ properties were studied independently. The experimental results showed that the activation index of the modification employing methacryloxy silane reached 97.5%, which achieved the best modification effect at 64.4 °C for 43.3 min. The waterborne coating with nanoscale titania modified by methacryloxy silane exhibited the best hydrophobic effect, with a drop contact angle of 115.4° and excellent heat resistance of up to 317.2 °C. The application of the waterborne modified coating in steel structures under subtropical maritime climates showed that the waterborne titania coatings demonstrated excellent resistance to corrosion, high temperatures and harsh sunlight, with a maximum service life of up to five years. Economic analysis indicated that, considering a conservative three-year effective lifespan, this coating could save more than 50% in cost compared with conventional industrial coatings. Finally, the strengthening mechanism of the polymer coatings with modified nanoscale titania was analyzed.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOFT MATERIALS
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2025
·
IF 1.4
Weimin Yan,Chengmin Hou,Chenyu Li
Ultraviolet curing (UV) water-based ink has the advantages of low viscosity, high gloss, and wide application range. However, there are some defects such as slow curing speed and low cross-linking degree. In this paper, the copolymer p(GMA-r-AA) was prepared via traditional radical polymerization using glycidyl methacrylate (GMA) and acrylic acid (AA) as monomers, and then p(GMA-r-AA) was modified by 2-hydroxyethyl methacrylate (HEMA) to obtain acrylic prepolymer P(GMA-r-AA)-g-HEMA with double bonds. Triethylenetetramine reacted with GMA to obtain a multifunctional reactive diluent triethylenetetramine hexamethacrylate glycidyl amide (TGMA). Fourier transform infrared (FTIR) spectroscopy combined with hydrogen nuclear magnetic resonance spectroscopy (1H NMR) was used to characterize the structures of the prepolymer P(GMA-r-AA)-g-HEMA and the reactive diluent TGMA. Three ingredients were needed to prepare UV curable ink: photoinitiator, multifunctional reactive diluent (TGMA), and acrylic prepolymer P(GMA-r-AA)-g-HEMA. The effects of the mass fraction and relative molecular weight of P(GMA-r-AA)-g-HEMA, the type and mass fraction of the photoinitiator, the number of functional groups, and the mass fraction of TGMA on the UV ink curing speed and wear resistance of the ink film were discussed. At a mass fraction of 1% for the photoinitiator TPO, the mass fraction of the reactive diluent was 55% with 4 functional groups, and the prepolymer had an average relative molecular mass of 5.63 × 104 g/mol. The UV water-based ink completed curing in 0.1 s, and the mass loss abrasion was 2–5% after 50 times. Finally, the UV ink was used to prepare UV conductive magnetic ink. The UV conductive and magnetic ink can be cured into a film in 0.1 s, no peeling phenomenon, with good magnetic properties.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wansheng Li,Yu Feng,Taisen Yan,Yongqiang Zhang,Xingguo Wei,Qinghang Lv,Jiang Qin
With the increasing power of electronic devices, thermal management has become crucial for their operational efficiency and lifespan. In this work, we have demonstrated a sorption-based thermal management strategy enabled by hygroscopic hydrogel. The polyacrylamide (PAM) hydrogel impregnated with LiCl (PAM-LiCl) was attached to a silicon wafer. And Pt metal circuits were coated to the silicon wafer to measure the temperature variations under different heat flux densities. The results show that the hydrogel can effectively reduce the surface temperature. At a heating power of 0.3 W/cm 2 , the temperature control duration reached 30 min, with an average effective heat transfer coefficient of 65.5 W/(m 2 ·K) and an effective heat storage density of 171 J/cm 2 . Additionally, we developed and validated a multiphysics model considering desorption and vapor diffusion within the hydrogel. Numerical results indicate that during the desorption cooling process, the surface heat transfer resistance and the internal diffusion resistance play a dominant role. Additionally, we analyzed the effects of material properties, structure parameters, and operating conditions on the thermal management performance. This study helps to understand the key points of sorption-based thermal management technology and guide the design and optimization of sorption-based thermal management system.
研究领域:
材料科学
·
热能工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ru Song,Ningshuang Zhang,Peng Wang,Hao Ding,Shiyou Li
The scarcity of freshwater resources and energy crisis are major challenges to the progress of human society. Recently, solar-driven interfacial water evaporation utilizes photothermal conversion materials to convert solar energy into thermal energy , which possesses great application potential in seawater desalination and sewage treatment . Here, we fabricated porous nickel sponge (NSP) composite photothermal material (NiO-NSP) containing abundant NiO nanoneedles array. This in situ-grown NiO with enhanced bonding between photothermal material and substrate can be used as a solar absorber directly without consuming additional photothermal material compared to conventional coating and cladding on the carrier surface. Due to the multi-scattering induced light trapping effect of the semiconductor NiO nanoneedles array on the surface of nickel fibers, resulting in light absorption up to 96.5 %. NiO-NSP evaporators have an abundance of interconnected porous channels for water supply , which results in strong capillary action to pump water to the evaporation interface efficiently. Moreover, the highly dispersed nanoneedles array expand the evaporation surface area. Consequently, the NiO-NSP evaporator delivers an excellent evaporation rate of 1.78 kg m −2 h −1 and a photothermal conversion efficiency of 84.7 % at one sun radiation. In addition, the micron-sized porous mesh structure of NiO-NSP dissolve salt crystals and diffuse them downward into the bulk brine, exhibiting excellent salt resistance and remarkable seawater desalination stability. Moreover, NiO-NSP solar evaporators has been demonstrated to possess excellent ability to purify dye and heavy metal ion wastewater. Therefore, the NiO-NSP high-performance evaporator produced by straightforward process proved to be suitable for solar seawater desalination and wastewater purification.
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guangli Ye,Kun Yu,Mengyuan Niu,Qian Wang,Menghan Yu,Xiongbo Dong,Huaming Yang
Minerals have been growing as an emerging ‘hot’ topic in separating water-in-oil emulsions. Whether the intrinsic structure of minerals could precisely regulate water–mineral interactions for enhancing emulsions separation efficiency is still ambiguous. Here, taking half-hydrated gypsum as a case, this study reveals the crystal facet-dependent potential mechanism of minerals in water-in-oil emulsions separation. We show that the (2 0 4) facet of half-hydrated gypsum is more susceptible to water-induced degradation and hydration reaction. With combined experimental and theoretical studies, the facet-dependent mechanism for oil–water separation are revealed; the (2 0 4) facet that exhibited weak internal hydrogen bond and strong binding energy with water accelerated the dissolution and recrystallization of half-hydrated gypsum, thus enhancing oil–water separation efficiency. Through engineering, half-hydrated gypsum with a higher surface fraction of the (2 0 4) facet achieved much higher separation efficiency (99.9%), surpassing those of minerals in disclosed literature. This investigation not only contributes significantly to the comprehension of interactions at the minerals-water interface but also illuminates novel perspectives and avenues for the utilization of facet engineering in advancing research on mineral surface properties.
研究领域:
材料科学
·
环境工程
·
化学工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ran Wei,Bo Yang,Chao He,Lunqiang Jin,Xiang Zhang,Changsheng Zhao
Superhydrophilic/superhydrophobic surfaces with unique superiority have been applied for oil-water separation over a long time. Facing the increasingly complicated requirements in diverse separation fields, developing intelligent surfaces with switchable superhydrophilic/superhydrophobic properties are highly needed. In this work, versatile and robust poly(ionic liquid) (PIL) coatings were designed and a series of intelligent materials with switchable superwettabilities were generated for high-efficient oil-water separation. The PIL coatings were obtained by polymerization of PIL monomer on the roughened GO sheets, for which were realized by the immobilization of Fe 3 O 4 nanoparticles. Three materials with different structures (cotton fabric (CF), nylon fabric (NF) and cotton ball (CB)) were chosen as the coating substrates. After “dip-coating” process, the PIL coated materials (PCMs) exhibited switchable superhydrophilic/superhydrophobic performances due to the anion-responsive behavior of PIL and the roughness enhanced effect. Thus, the PCMs showed high-efficient separation performances upon multiple oil-water separation cycles, and the separation could be switched between “water-removing” and “oil-removing” by anion exchange. Meanwhile, the PIL@CF had high permeate fluxes, which could separate layered water-oil mixtures rapidly under gravity; the PIL@NF had the highest separation efficiency; the PIL@CB possessed great potential to be used as efficient absorbents for water/oil adsorption and recycle.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shaojun Yuan,Chen Chen,Aikifa Raza,Ruixue Song,Tie-Jun Zhang,Simo O. Pehkonen,Bin Liang
Oil-contaminated water caused by either oil spill disasters or industrial disposal has posed a global risk to environmental sustainability and human health. To address the ever-growing need for highly efficient separation of oil/water mixtures, nanostructured TiO 2 /CuO dual coatings were fabricated on the copper mesh by a combination of electrochemical anodization and layer-by-layer self-assembly deposition to render its surface with superhydrophilic, underwater superoleophobic and self-cleaning functionality. Cu(OH) 2 nanoneedle arrays (NNA) were vertically grown from the copper mesh surfaces by electrochemical anodization processes, followed by the deposition of TiO 2 multilayer on the Cu(OH) 2 NNA via layer-by-layer assembly prior to being calcinated to form TiO 2 /CuO dual coatings. The nanostructured TiO 2 /CuO NNA dual-coated copper meshes were demonstrated to exhibit a high separation efficiency (oil residue content less than 20 ppm), excellent water flux (more than 80 kL·h −1 ·m −2 ), and desirable self-cleaning ability under ultraviolet (UV) illumination. The photo-catalytic ability of the deposited TiO 2 layers enabled the facile and rapid removal of the oil contaminants on the mesh surface under UV illumination to recover oil/water separation ability of the as-fabricated mesh for recycle use. With the adherent features of superhydrophilicity, underwater superoleophobicity and self-cleaning ability, the proposed TiO 2 /CuO NNA dual-coated meshes are potentially useful in practical oil/water separation applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）