MATERIALS & DESIGN
·
2023
·
IF 8.4
Xue-Fen Zhang,Xu-Dong Li,Ning Wang,Yong-Jiang Liu,Feng Tian,Chen-Xiang Wang
In this work, a robust epoxy adhesive (EP) @ superhydrophobic SiO 2 (SH-SiO 2 )-based superhydrophobic coating was prepared on the aluminum substrate by a simple one-step spraying strategy. The prepared EP@SH-SiO 2 coating exhibits hierarchical micro/nanostructures and is capable of maintaining a contact angle of more than 150° after 1000 cm of abrasion length and 80 tape-peeling repetitions. Molecular dynamics (MD) simulations and quantum mechanics calculations show that the improved mechanical resistance is attributed to the enhanced interfacial interaction between the EP@SH-SiO 2 coating and the underlying substrate induced by the epoxy adhesive. Electrochemical measurements in 3.5 wt% NaCl solution show the corrosion inhibition efficiency of the EP@SH-SiO 2 coating reaches up to 99.99%, and even after 8 days of immersion, the low frequency impedance modulus of the EP@SH-SiO 2 sample is still ∼1 order of magnitude higher than that bare aluminum, demonstrating excellent long-term corrosion protection. The diffusion behavior of the corrosive medium in the EP@SH-SiO 2 coating was revealed by MD simulation to support the experimental results. Additionally, the EP@SH-SiO 2 coating exhibits good chemical stability and hydrophobic repair properties. This work will provide a new perspective for the preparation and study of robust superhydrophobic aluminum for corrosion protection properties.
研究领域:
材料科学
·
防腐蚀工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2017
·
IF 4.601
Zhuqian Xiao,Yu Fan,Yongjie Cheng,Qiang Zhang,Qing Ge,Ruyi Sha,Jianbing Ji,Jianwei Mao
The catalytic transformation of cellulose to polyols is one of the significant strategies to overcome the shortage of fossil fuels. Here we report a simple but effective preparation method for Ni-W/SiO 2 catalysts by introduction of chelating agents (ammonium hydroxide and ethanediamine) coupled with organic reducing agent (ethylene glycol). The ethylene glycol (EG) yield from microcrystalline cellulose could reach up to 63.3% at 240 °C, 5.0 MPa H 2 for 2.0 h over 15%Ni-20%W/SiO 2 -EEG catalyst. Moreover, some key parameters of process conditions including calcining temperature, reaction temperature and time, H 2 pressure and the recycling use of catalysts were investigated. Both theoretical and experimental studies suggested that 15%Ni-20%W/SiO 2 -EEG catalyst showed the best activity and stability for cascading steps for EG formation at this reaction condition. By the detailed analysis of Ni-W/SiO 2 catalysts after calcination via FT-IR, XRD , XPS , thermogravimetry (TG), TEM and element mapping, it could be concluded that on the surface of 15%Ni-20%W/SiO 2 -EEG catalyst, the particles showed less agglomeration and more homogeneous on the surface of SiO 2 . Some Ni x W y alloys (NiW, Ni 2 W 4 C) were also formed. Furthermore, it was found that the introduction of ethanediamine could promote the actual loading of nickel and tungsten species slightly according to the analysis of ICP-OES test.
研究领域:
催化化学
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Yang Yushan,He Haishan,Li Yougui,Qiu Jian
Robust, buoyant, superhydrophobic PVB/SiO 2 coatings were successfully formed on wood surface through a one-step solvothermal method and a nanoimprint lithography method. The as-prepared PVB/SiO 2 /wood specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric/differential thermogravimetric (TG–DTG) analyses. The superhydrophobic property and abrasion resistance of rose-petal-like wood were measured and assessed by water contact angle (WCA) and sand abrasion tests. The results show that PVB/SiO 2 /wood not only exhibited a robust superhydrophobic performance with a WCA of 160° but also had excellent durability and thermostability during the sand abrasion tests and against corrosive liquids. Additionally, the as-prepared PVB/SiO 2 /wood specimens show high buoyancy.
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
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 29
·13985-13992
·
IF 3.3
Luo Xu,Fang Yang,Jiagen Li,Qihui Wang,Lin Du,Min Yang,Xiaohong Fu
In this work, an electrochemical sensor based on a highly efficient competitive method is proposed that uses SiO2-PNPG as an adsorbent for the efficient detection of Pb(II) in soil. The silica (SiO2) and N-phenylglycine (NPG) polymer (SiO2-PNPG), synthesized using a one-pot polymer method, was applied to construct specific metal electrochemical sensors with high sensitivity. The high sensitivity and good selectivity were accomplished in the determination of Pb(II) due to the selective penetration and accumulative effect of SiO2-PNPG. The correlation between the current response and the Pb(II) concentration presents a linear range from 2.12 to 15.78 μg mL−1 with a detection limit of 0.166 μg mL−1 (S/N = 3, R2 = 0.9987). The sensitivity, reproducibility and stability of this sensor are promoted due to the facilitated electron transfer.
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
Biomedical Materials
·
2022
·Vol. 17
·期 2
·025005
·
IF 4.103
Bo Li,Hong Li,Haocheng Yang,Yue Shu,Kejiang Li,Ke Chen,Wenqian Xiao,Xiaoling Liao
Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg ml−1, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg ml−1 AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.
研究领域:
材料科学
·
生物医学工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiang-Ping Chen,Qi-Jun Zhang,Chen-Xi Li,Chao-Yang Guo,Lu-Bin Zhong,Zhi-Hong Zheng,Jing-Yun Zhang,Zai-Dong Shao,Yu-Ming Zheng
The filtration of oil aerosols is crucial for safeguarding human health and protecting industrial machinery. While most research focuses on achieving high efficiency and low air resistance, limited studies have investigated filters that effectively combine these attributes with easy cleaning, primarily due to challenges associated with oil adhesion and the low mechanical strength of filter media. This study introduces a novel nanofibrous membrane (NFM) composed of fluorinated PVA/SiO 2 fibers, which exhibits cleanability alongside with high filtration efficiency. The F-PVA/SiO 2 NFM features a fibrous structure with periodic SiO 2 nano-protrusions on the PVA nanofibers, resembling the Chinese sweet Tanghulu . This design significantly enhances the surface roughness of the fibers. Moreover, the hydroxyl-rich PVA/SiO 2 matrix, in conjunction with the rough fiber surface, forms a durable amphiphobic coating after fluorination treatment. This coating retains its amphiphobic properties for over a year under ambient conditions while resisting swelling caused by organic solvents. Consequently, this design achieves an impressive filtration quality factor of 0.0190 Pa −1 , surpasses 95.58 % removal efficiency, and possessed an oil load capacity of 12.8 g m −2 . Furthermore, the filter can be easily regenerated through simple spray cleaning procedures without compromising its original filtration efficiency or experiencing significant pressure drop changes. Throughout ten consecutive filtration and cleaning cycles, the NFM consistently maintained its original filtration efficiency, with a 99 % restoration of pressure drop after each cycle. This F-PVA/SiO 2 NFM presents a practical solution for efficient oil aerosol filtration while offering excellent reusability and durability.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Pengwei Wang,Xin Zhang,Guofeng Zhao,Ye Liu,Yong Lu
Mn 2 O 3 -Na 2 WO 4 /SiO 2 is considered as the most promising catalyst for the oxidative coupling of methane (OCM) process; however, it only has a better catalytic performance over 800 °C. To improve its low-temperature performance, an attempt has been made to modify the Mn 2 O 3 -Na 2 WO 4 /SiO 2 catalyst using TiO 2 , MgO, Ga 2 O 3 , and ZrO 2 . Among the synthesized catalysts, the TiO 2 -modified Mn 2 O 3 -Na 2 WO 4 /SiO 2 catalyst shows markedly improved low-temperature OCM performance, achieving a high CH 4 conversion of ~23% and a good C 2 -C 3 selectivity of ~73% at 700 °C (the catalyst bed temperature), along with promising stability for at least 300 h without signs of deactivation. In comparison with the unmodified Mn 2 O 3 -Na 2 WO 4 /SiO 2 catalyst, the TiO 2 modification results in significant improvement in the low-temperature activity/selectivity, whereas the MgO modification has almost no impact and the Ga 2 O 3 and ZrO 2 modifications have a negative effect. The X-ray diffraction (XRD) and Raman results reveal that the formation of a MnTiO 3 phase and a MnTiO 3 -dominated catalyst surface is crucial for the improvement of the low-temperature activity/selectivity in the OCM process.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Chunxue Wang,Zhao Li,Xin Sun,Yuan Li,Lei Shi,Shunzheng Zhao,Kai Li,Ping Ning,Fei Wang
Ag-based catalysts show high activity in NH 3 -selective catalytic oxidation (NH 3 -SCO). The anchoring states of Ag species determines its valence and dispersion, thereby influencing the performance of Ag-based catalysts. Herein, we elucidated that the content and anchoring strength of the hydroxyl (OH) groups on support together affect the anchoring states of Ag. TiO 2 has few OH groups but high anchoring strength, the anchored Ag is in a highly dispersed oxidized state, while the unanchored Ag is aggregated in a metallic state (Ag 0 ), so it presents an unevenly sized dispersion and mainly in oxidized state. SiO 2 has abundant OH groups but weak anchoring, and can excessively agglomerate into large Ag 0 nanoparticles (Ag 0 NPs). Therefore, the introduction of SiO 2 can regulate the anchoring states of Ag on the TiO 2 support, making Ag presents highly dispersed Ag 0 NPs, thus following a reaction mechanism with lower energy barriers and significantly improving the NH 3 -SCO performance.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2019
·Vol. 7
·期 1
·1901446
·
IF 4.713
Zhenming Chu,Weicheng Jiao,Yifan Huang,Guomin Ding,Xue Zhong,Meiling Yan,Yongting Zheng,Rongguo Wang
Icing accretion on the surface of an aircraft not only increases the weight but also causes changes in the surface shape, so there is an urgent need for anti-icing/deicing without shutdown. Here, a graphene-based film with light weight, super-hydrophobicity, high electric heat, and durability, which has both anti-icing properties and electrothermal deicing capability, is proposed. The film is prepared with 1 H ,1 H ,2 H ,2 H -perfluorodecyltrichlorosilane (FDTS)-modified SiO 2 /rGO wrinkles, and it has a micro-nanoscale hierarchical structure. Moreover, the superhydrophobic properties of the film can be controlled by adjusting the wrinkle size. Because of its good water repellency, the film can prevent and delay the freezing of water droplets at low temperatures. At −10 °C, compared to a smooth rGO film, the icing time of 10 µL supercooled water droplet on the micro-nanoscale hierarchical structured film can be delayed by ≈8.3 times, and the ice adhension decreases greatly. In addition, the film exhibits high-efficiency electrothermal properties. At −10 °C, under a low voltage of 15 V, the film can be heated rapidly to achieve rapid deicing and defrosting. The graphene-based micro-nanoscale hierarchical structure shows great potential in the field of sky anti-icing and real-time deicing.
研究领域:
材料科学
·
航空工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 87
·期 3
·734-742
·
IF 1.745
Wang Xiaoqing,Wu Zongxiao,Zhi Mingjia,Hong Zhanglian
Abstract We reported the preparation of a series of ZrO 2 -SiO 2 composite aerogels via the sol-gel reaction between the zirconium source (ZrOCl 2 ·8H 2 O) and the gel initiator (mercaptosuccinic acid-triethoxyvinylsilane). Such novel gel gelator was prepared by the thiol-ene click reaction using triethoxyvinylsilane (VTES) and mercaptosuccinic acid (MSA). The unique molecule structure of the gel initiator allows the in-situ modification of ZrO 2 with SiO 2 in the sol-gel reaction, which was achieved by the hydrolysis and polycondensation of siloxane with the change of the pH spontaneously. SiO 2 with the controllable content can be in-situ introduced into ZrO 2 backbone. As a result, the composite aerogel showed better thermal stability compared with pristine ZrO 2 aerogel, proved by the following facts: (i) the aerogels remained amorphous after calcination in air at 600 °C; (ii) the specific surface area maintained at 53.4 m 2 /g when the temperature rising to 1000 °C.
ZrO 2 -SiO 2 composite aerogels with improved thermal stability have been prepared via the “thiol-ene” click section
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Lixiao Chen,Jie Gao,Qi Wu,Hui Li,Shuqing Dong,Xiaofeng Shi,Liang Zhao
A novel multimode COF-300@SiO 2 chromatographic stationary phase was successfully prepared via an in situ growth strategy. Powder X-ray diffraction, solid nuclear magnetic resonance and scanning electron microscope confirmed the successful preparation of COF-300@SiO 2 chromatographic stationary phase. Multimode chromatographic performance and multiple retention mechanisms were investigated. Neutral and polar compounds were efficiently separated in reverse phase chromatography mode due to hydrophobic interaction, π-π interaction, electron-donor-acceptor interaction and size selectivity of porous structure, and the column exhibited comparable hydrophobic selectivity with C18 column. Especially, the size selectivity of porous structure promoted the separation of multicomponent compounds on the novel column. Only neutral compounds were completely or partly separated in normal phase chromatography mode based on π-π interaction, and the column showed better separation performance than SiO 2 column. Moreover, the column also presented weaker hydrophilic interaction than NH 2 /SiO 2 column in hydrophilic phase chromatography mode. Nucleosides, nucleobases and alkaloids were partly or completely separated on the developed column because of the presence of amino groups on the surface of COF-300. This work indicates promising application values of COFs-based chromatographic stationary phases in chromatographic separation areas.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2018
·Vol. 4
·期 5
·487-495
·
IF 3.173
Zhinian Li,Shenliang Wang,Wei Hong,Shihui Zou,Liping Xiao,Jie Fan
Graphical Smart screens : An intelligent approach was developed to screen Na−Mn−W/SiO 2 catalysts for the oxidative coupling of methane (OCM). Effective composition regions other than the standard composition were successfully excavated. The wide range of the optimal composition allowed a fluctuation of composition during the reaction, which secured its excellent stability in the OCM reaction. Optimizing the performance and understanding the mechanism of metal oxide catalysts in the oxidative coupling of methane (OCM) is one of the most important projects in industrial catalysis. Here, we report an intelligent approach to screen Na−Mn−W/SiO 2 catalysts for the OCM reaction via ink-jet printing and multidimensional group testing. The ink-jet-printing-assisted (IJP-A) synthetic methodology ensured a fast synthesis of 1536 catalysts that were evaluated in 24 tests via a multidimensional group testing strategy (m-GT). After two-round synthesis-and-screening processes, several excellent groups with different composition space were screened out. Among the excellent catalysts, the OCM performance of Na−Mn−W/SiO 2 catalyst with higher Na, Mn and W content (G3 and G7) was less sensitive to its constituent than that of Na−Mn−W/SiO 2 catalyst with lower Na, Mn and W content (G1). These results indicated the sensitivity of performance to its Na, Mn and W content decreased in larger Na, Mn and W spaces, consistent with the complex homogeneous/heterogeneous reaction mechanism and multi-active sites. A series of Na−Mn−W/SiO 2 formulas with good performance also provide a reasonable explanation to its excellent stability for the OCM reaction. In addition, this intelligent optimization in total space offers a pathway to study the multicomponent metal oxide catalyst in the OCM reaction.
研究领域:
化学工程
·
催化
·
材料科学
✓ 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）