CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Huagui Jin,Xuebin An,Shizhao Wang,Yunshan Wang,Gang Yang,Yong Sun
s This study investigates the removal of fluorine (F) impurities from phosphogypsum (PG) using steam as the reaction medium. The effects of the reaction atmosphere, temperature, time, and steam velocity on F impurities removal were systematically examined. The results showed that with a steam velocity of 0.0184 m·s −1 , a reaction temperature of 700 °C, and a reaction time of 60 min, the F removal rate reached 95.87%. Further investigations into the defluorination mechanism revealed that steam and SiO 2 synergistically enhance fluoride removal, playing a crucial role in improving the defluorination efficiency. Kinetic analysis of the defluorination process, based on the shrinking core model (SCM), indicated that internal diffusion is the rate-controlling step, with the activation energy of 30.12 kJ·mol −1 . This study identifies optimal conditions for PG defluorination and proposes a defluorination mechanism, contributing to the theoretical understanding of impurity removal through the thermal treatment of PG.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xinke Li,Xinru Wang,Xing Wang,Hanwen Xin,Xujie Yang,Jinghui Zhou,Dayin Sun
Properly cleansing the skin surface plays a crucial role in maintaining the overall body health. Incorporating nanoparticles into skincare products can enhance deep cleansing applications of the skin within the complex system formed by epidermal secretions. This study presents a nanoparticle cleansing tool, namely, patchy structure lignin composite nanoparticles. Lignin, a natural polymer, exhibits the ability to self-assemble into ultrasmall nanosized particles when exposed to a suitable solvent. Meanwhile, the surface of traditional SiO2 clean powder can be modified using rapid grafting techniques to create patchy structures. When these nanoparticles, featuring a patchy microconvex structure, come into contact with the skin, they exhibit stronger friction performance compared to hydrated silica with a smooth surface. As a result, an interlocking state forms among the nanoparticles, facilitating the removal of complex skin systems through the formation of a nanoparticle chain network. This ultimately leaves the skin cleaner and fresher. The unique composition and structure of these patchy composite nanoparticles provide an innovative approach to the development of cleansing products.
研究领域:
材料科学
·
生物学
·
皮肤病学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiansheng Tan,Wenting Deng,Shuhuan Feng,Tengfei Xu,Yuxin Wang,Jianhao Zhao,Jianhua Rong
For hydrogel applied in joint cartilage replacement, achieving both high toughness and low friction performance is a significant challenge. This study modifies polyvinyl alcohol hydrogel by using wet annealing and immersion methods. Wet annealing allows conformational rearrangement to improve crystallinity while maintaining the overall structure of the hydrogel. The immersion method induces the formation of tiny silica dioxide particles within the hydrogel. The mechanical properties of the hydrogel are greatly enhanced through the synergistic effect of these two mechanisms. Additionally, the introduction of mucin into the hydrogel achieves ultra-low lubrication performance through the brush-like oligosaccharide side chains and the negative charge saliva residues of mucin. The prepared hydrogel material not only exhibits excellent mechanical properties (tensile strength 5.11 MPa, tensile modulus 4.56 MPa, compressive strength 27.56 MPa, compressive modulus 2.04 MPa), but also maintains continuous lubrication and a low friction coefficient (0.037) under high loads (5 N) and high speeds (20 mm/s). The hydrogel maintains volume stability in a simulated body fluid environment for an extended period after swelling equilibrium. This method for preparing ultra-tough and lubricating hydrogels can offer valuable insights for researchers in the field.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weiran Zhou,Yuchen Geng,Tao Zhou,Yu Wang,Huazhang Zhao,Xiaohui Wu,Jianfeng Li
Membrane distillation (MD) technology has shown unique advantages in treating saline organic wastewaters, however, improving membrane materials of anti-wetting/fouling properties is still agap for the large-scale application. In this study, a non-fluorinated composite membrane showing both good amphiphobic properties and high flux was synthesized by feasible electrostatic attraction. Characterizations indicated that SiO 2 nanoparticles were successfully loaded on the PVDF membrane (SiO 2 /PVDF) surface to form a multi-level rough amphiphobic structure, with contact angles of water and ethylene glycol as 139° and 128°, respectively. In MD tests, the SiO 2 /PVDF membrane exhibited a stable flux of 15 LMH with 3.5 wt% NaCl and 19.5 LMH with 50 mg/L kerosene. Notably, after a 24-hour continuous test, the flux remained above 9 LMH for NaCl and 11 LMH for kerosene, with salt rejection rates exceeding 98 %, indicating excellent anti-fouling characteristics. This study is expected to provide a feasible membrane modification for MD process in treating high saline organic wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2021
·
IF 5.584
Shengna Liu,Liancun Zheng
The classical constitutive equations for heat transfer of non-Newtonian fluids in shear flow fields neglect viscous dissipation and the field synergistic properties of rheology and heat transfer. In this paper, a novel constitutive Eq. (6) for rheological synergy thermal conductivity was derived by considering viscous dissipation. Based on this, we established an experimental platform to investigate the heat transfer properties of HEC-based silicon dioxide nanofluids (different nanoparticle sizes and volume fractions) in shear flow field for two cases: neglecting viscous dissipation and considering viscous dissipation. The results show that viscous dissipation have very important effects on heat transfer behavior at different shear rates and rheological properties. The contribution of viscous dissipation to the thermal conductivity increases with shear rate and particle volume fraction, but decreases with temperature. Among all the measured results, the maximum contribution of viscous dissipation to the thermal conductivity reached 19.86%. This confirms that the viscous dissipation is not negligible and the field synergy between rheology and heat transfer of non-Newtonian fluids must be considered in the shear flow fields.
研究领域:
热力学
·
流体力学
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产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Xin Wang,Jimei Wu,Zhiguang Zhang,Guirong Xiong
Nanoparticle (NP) self-assembly from suspension evaporation has been a topic of interest in recent times to fabricate a solid-state structure with diverse functions. We present a simple and facile evaporation-induced strategy for the formation of NP arrays on a flat substrate utilizing a template-directed sandwich system. The lithographic features assist the assembly of the typical nanoparticles (NPs), including SiO2, QDs@PS FMs, and QDs, on the top into circle, stripe, triangle, or square geometries with a fixed width of 2 μm. Additionally, an anionic surfactant, sodium dodecyl sulfonate (SDS), is incorporated into a negatively charged, hydrophilic SiO2 dispersion to govern the aggregation and self-assembly of NPs, fine tuning the morphologies of the residual structures on the substrate. SDS is attributed to modify the nature of SiO2 NPs to be hydrophobic, increase the hydrophobic attraction, dominating particle–particle and particle–interface interactions, and strengthen the particle–particle repulsive electrostatic force that results in the reduction of SiO2 NPs trapped in the separated colloidal suspension drop. Thus, using the SDS surfactant with the concentration ranging from 0 to 1 wt %, the obtained well-ordered SiO2 NP pattern packing on the substrate varies from six layers to one layer.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2017
·Vol. 56
·期 17
·4905-4910
·
IF 1.65
Yuan Cheng,Kangning Sun
Core-shell structured SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres were prepared by a simple solgel method followed by a subsequent heat treatment. The as-prepared composites were characterized by a scanning electron microscope, high-resolution transmission electron microscope, x-ray diffraction, and photoluminescence spectra. The influences of different coating numbers were also studied. To sum up, the composites are spherical shaped with an average diameter of 200 nm, and the YVO4:Yb3+, Er3+, Eu3+ luminescent particles are successfully coated on the surface of SiO2 nanospheres. Under the near-infrared irradiation at 980 nm, the composites can emit strong green lights (at 525 nm, 550 nm) attributed to the H11/22→I15/24, S3/24→I15/24 transitions of Er3+ ions, and slight red lights (at 590 nm, 620 nm) attributed to the D05→F17, D05→F27 transitions of Eu3+ ions. Given the above, due to the regular core-shell structure, the uniform distribution of nanoparticles, and the colorful emissions, the SiO2@YVO4:Yb3+, Er3+, Eu3+ nanospheres may have great potential for some biological applications, such as biological tracers, bio-labeling, and so on.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 31
·16443-16450
·
IF 6.895
Yan Bao,Yuanxia Zhang,Jianzhong Ma
Durable superhydrophobic coating is attractive due to its long-term superhydrophobicity, anti-fouling and self-cleaning properties. However, the fabrication of durable superhydrophobic coatings on a fragile surface, including leather and paper, is still a challenge due to its bad resistance to harsh environments such as high temperature, high pressure and strong acid or strong base. Herein, we developed a universal way to fabricate long-lasting superhydrophobic coating on leather via amphiphilic Janus particles, which have one of the semispheres functionalized with hydrophobic 1-dodecanethiol and the other semisphere functionalized with hydrophilic β-mercaptoethylamine. Polyurethane with isocyanate end groups was sprayed on the leather surface as an intermediate layer to strongly link Janus particles with leather via cross-linking. Moreover, amphiphilic Janus particles were fabricated from hollow SiO2 particles via a thiol–ene click reaction due to its low density. The superhydrophobic coating on leather possessed a high water contact angle of 162.2°. Furthermore, it still retained excellent hydrophobicity with a water contact angle of 154° after 140 cycles of abrasion using sandpaper. This study not only provides a novel method for the fabrication of amphiphilic hollow SiO2 Janus nanoparticles, but also resolves the difficulties in constructing long-lived superhydrophobic coatings on fragile surfaces by existing methods. Meanwhile, the present study also suggests a potential way to translocate functional Janus microcapsules, which may give some significant suggestions on the future nanoparticle design for drug delivery and energy storage.
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
LANGMUIR
·
2021
·
IF 3.882
Xiangli Wen,Pengpeng Bai,Yuanzhe Li,Hui Cao,Shaowei Li,Bin Wang,Jingbo Fang,Yonggang Meng,Liran Ma,Yu Tian
Liquid superlubricity results in a near-frictionless lubrication state, which can greatly reduce friction and wear under aqueous conditions. However, during the running-in process, a large number of abrasive particles are generated, and because these may lead to a breakdown in superlubricity performance, they should be effectively removed. In this paper, the morphology, size, and composition of abrasive particles were verified using scanning electron microscopy with energy-dispersive X-ray spectroscopy, and their influence on liquid superlubricity was explored through friction tests. Subsequently, different solvents were used to remove the abrasive particles, and the optimal cleaning process was determined by macroscopic tribo-tests and microscopic analysis. Finally, droplet-spreading experiments and a force-curve analysis were carried out to understand the abrasive-particle removal mechanism by different solvents. We found that SiO2 was the main component in the abrasive particles, and micron-sized SiO2 particles resulted in random “wave peaks” in the coefficient of friction and, thus, the superlubricity. Absolute ethanol + ultrapure water was determined to be the optimal solvent for effectively removing abrasive particles from friction-pair surfaces and helped the lubricant in exhibiting an ultralow friction coefficient for long periods of time. We proposed a “wedge” and “wrap” model to explain the abrasive-particle removal mechanism of different solvents. The SiO2 removal mechanism outlined in this study can be applied under aqueous conditions to improve the stability and durability of liquid superlubricity in practical engineering applications.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Juan Wang,Zongxue Yu,Xuehan Xiao,Zhiquan Chen,Guangyong Zeng,Yucheng Liu,Jiajia Hou
In this paper, a method of growing SiO 2 on hydroxyapatite in situ and depositing it into polydopamine-modified MCEM membrane was reported to prepare super-hydrophilic underwater super-oleophobic coatings. The results showed that the hydrophilic properties of SiO 2 , the hydroxy-rich structure of hydroxyapatite and the synergistic action of polydopamine made the membrane have excellent hydrophilicity. The modified HAP@SiO 2 /PDA coating membrane not only had excellent mechanical properties, but also had good oil and water selectivity. At the same time, the membrane separation flux of light oil can reach 3000 L/(m 2 ·h), and the oil discharge rate of heavy oil can reach 98.95%. More importantly, the membrane can remove 90.90% of the actual oilfield wastewater. As a result, HAP@SiO 2 /PDA coatings can effectively treat a wide range of oily wastewater and demonstrate attractive separation capabilities.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Bo Wu,Yi Xu,Nan Wu,Xianzhong Tang
Dielectric materials play a crucial role in 5G communication technological applications such as printed circuit board (PCB) high-frequency substrate materials. Unfortunately, the fabrication of desirable dielectric performance in organic–inorganic composites is a great challenge because of lack of good interfacial compatibility and uniform dispersion between fillers and polymer. In this work, silicon dioxide (SiO 2 ) was synchronously functionalized by γ-methacryloxypropyltrimethoxysilane (MPS, s-SiO 2 ) and 1,2-polybutadiene (PB, v-SiO 2 ), which were then used as fillers to fabricate the s-SiO 2 /polyolefin or v-SiO 2 /polyolefin laminates. All the v-SiO 2 /polyolefin laminates exhibited better dielectric, thermal and mechanical properties than those of s-SiO 2 /polyolefin laminates under the same filler content. Specially, the 50 wt% v-SiO 2 /polyolefin laminate displays a low dielectric constant (3.42) and loss (3.55 × 10 -3 ) at 10 GHz. Meanwhile, it also shows good stability of dielectric properties in a wide range of high-frequency. This work is conducive to develop laminates with superior dielectric properties and apply to PCB high-frequency substrate field.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Silicon
·
2025
·
IF 3.3
Cui Meng-Jie,Muhammad Imran,Ren Tie-Zhen,Okitsu Kenji,Fan Wei,Zhang Xue-Jun
Rice husk ash (RHA), obtained through pyrolysis of rice husk (RH), is primarily composed of silicon dioxide (SiO 2 ). However, a conventional thermal treatment produces harmful byproducts, that can pollute the environment and harm biological health. Meanwhile, energy consumption hinders scaling up a conventional producing technique. Here, an electron-assisted thermal decomposition (EATD) technology was developed to obtain silicon dioxide (SiO 2 ), which included two mixed crystal phases: cristobalite and tridymite. The influence of temperature on the SiO 2 structure was examined through the various structural characterizations. Based on the experimental findings, we emphasized that the EATD process induced specific structural phase and glass transition owning to the radiated heat system. Notably, the prepared samples displayed the ability as a chemical sensor for Cr 6+ and photocatalyst for methylene blue (MB) degradation. This unique characteristic improved the detection signal for Cr 6+ by at least twofold, resulting in a streamlined detection technique that reduced the risk of secondary pollution.
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
危险品化学品经营许可证（带存储）