Polymers
·
2023
·Vol. 15
·期 15
·3273
·
IF 5
Bifeng Fan,Junjie Yang,Lin Cao,Xiao Wang,Jie Li,Yingfei Yang,Qiwei Wang,Peng Zhang,Florin Vogel,Wei Li,Zhidan Lin
Due to green development in recent years, water-borne epoxy resins (WBE) have become increasingly popular since they generate the lowest level of volatile organic compounds (VOC) during curing. However, because of the large surface tension of water, it is easy to produce voids and cracks during the curing process of the coating. An electrochemical strategy was used in this study to assess the impact of different SiO2content on the corrosion performance of a WBE coating, in which micron spherical SiO2particles were synthesized in a liquid phase reduction. The results showed that the synthesized micron spherical SiO2particles were about 800 ± 50 nm in diameter and in an amorphous state. By hydrophilizing the surfaces of these SiO2particles, uniform dispersion in an aqueous solvent and a WBE can be achieved. It is important to note that adding a small or excessive amount of SiO2to a coating will not improve corrosion resistance and may even reduce corrosion resistance. With the appropriate modification of SiO2, corrosion resistance of composite coatings is greatly enhanced, as is the adhesion between the coatings and the metallic substrates. Because the appropriately modified SiO2can effectively fill the pores that are formed during the curing process, a corrosive medium is less likely to react with the matrix when the medium comes into contact with the matrix. Based on their incorporation content of 3 wt.%, their corrosion resistance is the best after 16 cycles of AC-DC-AC accelerated corrosion tests.Keywords:water-borne epoxy resin;micron SiO2filler;corrosion resistance;AC-DC-AC test
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoyu Wang,Dong Zhang,Gaopeng Wang,Shuaibing Wang,Mengjie Si,Jiahui Zhou,Yisheng Xu,Guangyan Du,Si Yu Zheng,Jintao Yang
The smart gating membranes with stimuli-response permeation variations have attracted tremendous interest in the field of wastewater treatment. Specifically, successful integration of accurate porous architecture, precise water permeance regulation, long-term duration and in-situ detection of multiple environmental signals in a visualized way is highly desired yet still exclusive. Herein, a smart gating membrane with a combination of accurate porous adjustment and multi-signals detection is developed by assembling poly[2-(1-(4-vinylbenzyl) pyridin-1-ium-4-yl) ethane-1-sulfonate] (PVPES)-grafted SiO 2 nanoparticles on cellulose membrane. The membrane exhibits uniform packing architecture with highly tunable water permeance from 0 to 15,330 L m −2 h −1 bar −1 , mediated via polymeric shell thickness control and external salt-stimulation; besides, in-situ detection of heavy metal ions and pH values of the treated solution is simultaneously achieved via the pH-induced discoloration and heavy metal ion-dependent fluorescence of PVPES. What’s more, the membrane shows great mechanical stability against repeated bending, vibration or abrasion, as well as great anti-fouling capability, which together contributing to a long service life. We believe the membrane developed here will definitely promote the practical application of smart gating membranes.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2023
·
IF 4.1
Xuefeng Bai,Han Zhang,Sijia Sun,Jie Wang,Yu Tu,Hao Ding
Defect engineering and heterojunction are the two dominant methods to improve the efficiency of semiconductor photocatalysis . Loading can also improve the performance of photocatalysts and solve the problems of photocatalyst agglomeration and difficult recovery in water. In this paper, a ternary ZnIn 2 S 4 /TiO 2 /MS-SiO 2 composite photocatalyst (EG-ZIS/TS) was constructed by sequentially loading nano-TiO 2 and defective state ZnIn 2 S 4 (EG-ZIS) on industrial by-product SiO 2 microspheres (MS-SiO 2 ). Among them, EG-ZIS was prepared with ethylene glycol as a solvent. Compared with EG-ZIS/T (unloaded MS-SiO 2 ) and ZIS/TS (non-defected state ZnIn 2 S 4 ), the degradation performance of methyl orange (MO) solution and the reduction performance of hexavalent chromium under simulated daylight irradiation were substantially improved. As a result, Zn defects enhanced the photocatalytic performance of ZnIn 2 S 4 and the heterojunction between ZnIn 2 S 4 and TiO 2 , and this enhancement was achieved by adjusting the work function of the system and promoting interface electronic transmission. The loading of MS-SiO 2 further produced a synergistic effect of enhancing the heterojunction photocatalytic efficiency by improving the dispersion and immobilization of TiO 2 and EG-ZIS. The effect of ethylene glycol on the curvature and surface Zn defectivity of ZnIn 2 S 4 nanosheets was also investigated in this study. This study provides an innovative approach to improve the oxidation and reduction performance of photocatalysts by combining semiconductor defect, heterojunction, and loading on the carrier surface and finds that the loading of photocatalysts on the SiO 2 carrier surface has an enhancement effect on the performance of the formed heterojunction. This thesis is useful and informative for related research.
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Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·2031-2044
·
IF 2.3
LV Xiaojing,Wang Jinwei,Guo Yong,Guo Yanxin
Phosphorus-containing liquid epoxidate polybutadiene (PDCP-LEPB) is synthesized and used as a reactive additive to improve the water, wear and fire resistance of UV-curable acrylate coatings containing nano-SiO 2 as a filler. The structure of PDCP-LEPB and the curing condition are confirmed by Fourier transform infrared spectroscopy (FTIR). The addition of PDCP-LEPB should be controlled at around 10% as shown by thermal stability measurements; with the addition of PDCP-LEPB, composites show earlier degradation to release flame-retardant components, and thus the fire resistance of plywood is improved when its surface is applied by the composite coatings containing PDCP-LEPB. Besides, the fire protecting ability can be greatly enhanced with SiO 2 addition due to the synergistic effect of P, Si and Cl coexistence in the matrix. The addition of PDCP-LEPB improves the water resistance of plywood as reflected by the water absorption rates, contact angle measurements and stain resistance test due to the hydrophobic nature of olefin backbone and increment of crosslinking density; the addition of nano-SiO 2 has a much more positive effect on the improvement in their stain resistance and wear resistance due to the increase in surface roughness and stiffness, respectively.
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Membranes
·
2023
·Vol. 13
·期 9
·756
·
IF 4.2
Shuangjie Shi,Kejie Jian,Minfeng Fang,Jian Guo,Pinhua Rao,Guanghui Li
Silicon carbide (SiC) membrane has emerged as a promising class of inorganic ceramic membranes with many advantageous attributes and has been used for a variety of industrial microfiltration (MF) processes. The state-of-the-art industrial manufacturing of SiC membranes based on the particle sintering method can only achieve an average pore size that ranges from 40 nm to a few micrometers, which is still unsatisfactory for ultrafiltration (UF) applications. Thus, the pore size control of SiC membranes remains a focus of continuing study. Herein, we provide an in situ sol–gel modification strategy to tailor the pore size of SiC membranes by a superficial deposition of SiO2onto the membrane surface and membrane pore channels. Our in situ sol–gel modification method is simple and effective. Furthermore, the physical characteristics and the filtration performance of the membrane can easily be controlled by the in situ reaction time. With an optimal in situ reaction time of 30 min, the average pore size of the membrane can be reduced from macropores (400 nm) to mesopores (below 20 nm), and the retention ability for 20 nm fluorescent PS microspheres can be improved from 5% to 93%; the resultant SiC/SiO2composite membranes are imparted with water permeance of 77 L·m−2·h−1·bar−1, improved anti-protein-fouling properties, excellent performance, and anti-acid stabilities. Therefore, modified SiC/SiO2membranes based on the in situ sol–gel process have great potential as UF membranes for a variety of industrial processes.Keywords:silicon carbide membrane;membrane modification;composite membrane;in situ sol–gel;improved performance;microfiltration;ultrafiltration;pore size control
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MOLECULES
·
2023
·Vol. 28
·期 24
·7970
·
IF 4.6
Gang Deng,Lu Yao,Mingzhao Chen,Yuanyuan Yang,Song Lu,Guohua Wu
With the improvement in people’s living standards, the development and application of smart textiles are receiving increasing attention. In this study, a carbon nanosurface was successfully coated with a SiO2layer to form C@SiO2nanomaterials, which improved the dispersion of carbon nanomaterials in an aqueous solution and enhanced the absorption of light by the carbon nanoparticles. C@SiO2nanoparticles were coupled on the surface of silk fabric with the silane coupling agent KH570 to form C@SiO2nanosilk fabric. The silk fabric that was subjected to such surface modification was endowed with a special photothermal function. The results obtained with scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and infrared spectroscopy (FTIR) showed that C@SiO2nanoparticles were successfully modified on the surface of the silk fabric. In addition, under the irradiation of near-infrared light with a power of 20 W and a wavelength of 808 nm, the C@SiO2nanosilk fabric experienced rapid warming from 23 °C to 60 °C within 30 s. After subjecting the functional fabric to hundreds of photothermal experiments and multiple washes, the photothermal efficiency remained largely unchanged and proved to be durable and stable. In addition, the thermogravimetric (TG) analysis results showed that the C@SiO2nanoparticles contributed to the thermal stability of the silk fabric. The UV transmittance results indicated that C@SiO2nanofabric is UV-resistant. The silk modification method developed in this study is low-cost, efficient, and environmentally friendly. It has some prospects for future applications in the textile industry.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Renhan Li,Gongxun Bai,Hongbin Zhang,Enhai Song,Jiasong Zhang,Denghao Li,Junjie Zhang,Shiqing Xu
As an environment-friendly powder with good coloring performance, rare earth sulfide is one kind of the important choices to replace cadmium and lead colorants. In particular, γ-Ce 2 S 3 belongs to rare earth sesquisulfide, which has a bright red color. However, the uncoated γ-Ce 2 S 3 is easy to decompose and release H 2 S in a humid or acidic environment, and its air thermal stability is limited to 350°C. In this work, γ-Ce 2 S 3 powders coated with zinc oxide were prepared by heterogeneous precipitation method, and a dense protective layer was formed by ZnO to improve chemical and thermal stability. Moreover, silicon dioxide was deposited on the surface of the zinc oxide coating using the microemulsion process to strengthen the powder's acid resistance. The double shells structure greatly promoted thermal stability and acid resistance of γ-Ce 2 S 3 powders. The results showed that rare earth sulfide powders with double shells have good stability for coloring applications.
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JOM
·
2023
·Vol. 75
·期 12
·5167-5175
·
IF 2.6
Li Guanghui,Huang Jiahao,Sun Hu,Mang Changye,Hou Yanrui,Luo Jun
The novel one-step oxidation–volatilization process for separating MoO 3 from pelletized MoS 2 concentrate supported on a porous Al 2 O 3 -SiO 2 skeleton has been demonstrated to have superior diffusion efficiency compared to the traditional two-step oxidative roasting-sublimation approach. Optimal control of pellet phase and micro-structure evolutions is crucial for maintaining a stable and breathable pellet bed throughout the roasting process, which is essential for industrial application of the new process. This work determined the phase transformations of MoS 2 concentrate pellets during roasting, revealed the formation mechanisms of mullite whiskers from MoS 2 -Al 2 O 3 -SiO 2 system and thus achieved toughening control of roasted MoS 2 concentrate pellets with temperature programmed roasting (TPR). It is found that the intermediate product Al 2 (MoO 4 ) 3 can induce the low-temperature formation of mullite whisker. With TPR, the volatilization rate of molybdenum is 97.2%, and the compressive strength of mullite pellets reach 124.8 N. This study puts forward a feasible route with industrial significance.
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PETROLEUM SCIENCE AND TECHNOLOGY
·
2023
·
IF 1.5
Yan Chen,AL-Maamari Zaher Adel,Yahan Wang,Yunjie Wang,Gavkhara Ismoilova
The foam performance of hydrophilic nanoparticles SiO2/SDS (Sodium Dodecyl Sulfonate) foam about temperature and salinity had been assessed by experiments. The concentration of Na+, Ca2+, and Mg2+ ions on foaming volume and foam half-life were verified, and the mixing dispersions with Na+, Ca2+, and Mg2+ concentration of 8:1:1 was researched the IFT, elastic modulus and foam strength by FoamScan for plugging ability. The mixing dispersions of no salinity and Na+, Ca2+, and Mg2+ of 8:1:1 were used to verify the salinity effects on foam properties by building hydrophilic SiO2 nanoparticles at the Gas-liquid interface. The flooding ability of two different foam dispersions was compared to enhance oil recovery. The flooding ability of two surfactant dispersions to oil molecules was verified by building the oil flooding models. In conclusion, the best foam performance condition was 30°Cand the sensitivity to hydrophilic SiO2/SDS dispersions could be summed up as: Ca2+> Mg2+ > Na+, hydrophilic SiO2/SDS foam dispersions with Na+, Ca2+, Mg2+ concentration of 8:1:1 had better foam stability and plugging ability at the salinity of 7.5 × 104∼12.5 × 104mg/L. The oil recovery increased from 53.62% to 68.54%, and simulation results showed that the removal of oil molecules was more efficient in mixed dispersions.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Hao Li,Shenyue Gao,Hang Ding,Yuetong Tao,Shenghua Ma,Gang Wang,Beibei Wang
Interfacial solar steam generation is considered the next-generation desalination and sewage treatment technology. However, realizing solar evaporators with broad-spectrum absorption, efficient thermal conversion, and high stability remains a challenge. The high light-trapping surface structure and fast water transport channels of the evaporator improve the evaporation efficiency, and solar evaporators have great potential in the field of solar steam generation. Herein, the mixture of transition-metal carbide (Ti3C2Tx) and core–shell Ag–SiO2 nanoparticles (Ag@SiO2 NPs) is fabricated as a three-dimensional (3D) vertical porous Ti3C2Tx/Ag@SiO2 gel evaporator via ice templating technology. The synergistic interaction between dual Ti3C2Tx–Ag plasma materials confined in a cross-linked microcapillary structure realizes 97.6% wide absorption in the wavelength range of 250–2500 nm. The SiO2 coating on the surface of Ag NPs can inhibit the oxidation of Ag NPs and conduct heat collection management. The 3D vertically cross-linked porous structure promotes efficient water transport and improves the mechanical strength of the evaporator. The Ti3C2Tx/Ag@SiO2 gel evaporator exhibits a high evaporation rate of 1.42 kg m–2 h–1 and a photothermal conversion efficiency of 98% under 1 sun illumination. The Ti3C2Tx/Ag@SiO2 gel evaporator shows great application prospects in seawater desalination and sewage purification.
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ADVANCED MATERIALS
·
2023
·
IF 29.4
Yingzhen Wei,Shuang Wang,Mengyang Chen,Jinfeng Han,Guoju Yang,Qifei Wang,Jiancheng Di,Hongli Li,Wenzheng Wu,Jihong Yu
Core–shell catalysts with functional shells can increase the activity and stability of the catalysts in selective catalytic reduction of NO x with ammonia x . However, the conventional approaches based on multistep fabrication for core–shell structures encounter persistent restrictions regarding strict synthesis conditions and limited design flexibility. Herein, a facile coaxial 3D printing strategy is for the first time developed to construct zeolite-based core–shell monolithic catalysts with interconnected honeycomb structures, in which the hydrophilic noncompact silica serves as shell and Cu-SSZ-13 zeolite acts as core. Compared to a Cu-SSZ-13 monolith which suffers from the interfacial diffusion, the SiO 2 shell layer can increase the accessibility of active sites over Cu-SSZ-13@SiO 2 , resulting in a 10–20% higher NO conversion at200−550 °C under 300 000 cm 3 g −1 h −1 . Meanwhile, a thicker SiO 2 shell enhances the hydrothermal stability of the aged catalyst by inhibiting the dealumination and the formation of CuO x . Other representative monolithic catalysts with different topological zeolites as shell and diverse metal oxides as the core can be also realized by this coaxial 3D printing. This strategy allows multiple porous materials to be directly integrated, which allows for flexible design and fabrication of various core–shell monolithic catalysts with customized functionalities.
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LANGMUIR
·
2023
·
IF 3.9
Chuanqing Zhao,Fangke Qiao,Jiawei Ji,Shifeng Deng,Huimin Qi
Polymer-reinforced silica aerogels are thermally insulating materials employed to enhance mechanical properties; however, they exhibit low heat stability and require a complex production process. The main body of this work concerns the synthesis of silicon-containing polyarylacetylene (PSA) resin, which has exceptional thermal properties and is used to strengthen the gel skeleton and significantly improve the heat resistance of the polymer reinforcement phase. The honeycomb-like porous SiO2/PSA aerogels derived from directional freezing were obtained via click reaction, gel aging, freeze-drying, and curing without the requirement for time-consuming solvent replacement. The prepared SiO2/PSA aerogel is low density (∼0.3 g/cm3) and high porosity (∼80%), which provides the material with low levels of thermal conductivity (∼0.06 W/m·K) and excellent thermal insulation performance. When compared to the majority of polymer aerogels and aerogel-like materials, the prepared SiO2/PSA aerogels have high Td5 (∼460 °C) and Yr800 (∼80%) and compressive strength (compression strength > 1.5 MPa). SiO2/PSA composite aerogel has numerous functions in areas where materials must withstand extremely elevated temperatures, such as the aerospace industry.
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