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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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Jiale Zhu,Siyan Yan,Guohao Xu,Xuedong Zhu,Fan Yang
A variety of HZSM-5 zeolites with different b-axis thicknesses and SiO 2 /Al 2 O 3 were fabricated by simply modifying urea content and Al source feeding in the initial gel, respectively. Multiple characterization technologies including XRD , SEM, N 2 adsorption-desorption, NH 3 -TPD and Py-IR were employed to investigate physicochemical properties of these samples and the possible crystallization mechanism was proposed that adsorption of urea molecules on (010) facet was the key factor for fabricating thin-sheet HZSM-5 zeolites. The results of hexane cracking reaction revealed that the selectivities of light olefins reached 46.5% when controlling b-axis thickness to 340 nm, exceeding the control sample by 12.2%. Furthermore, the effect of SiO 2 /Al 2 O 3 under this b-axis thickness was also investigated and concluded that keeping SiO 2 /Al 2 O 3 to 200 could exhibit the optimum catalytic performance with the conversion of 95.5% and light olefins selectivities of 56.7%. The reaction conditions were optimized to be 600 °C at the N 2 flow rate of 25 mL/min and WHSV of 3 h −1 to arouse the best performance. Under this condition, the distribution of ethene and propene was quite close to that of thermodynamic equilibrium. Based on these results, the primary and secondary products were uncovered, and further the reaction pathway of hexane cracking was disclosed. This new strategy to synthesize sheet-like catalysts for enhancing the catalytic properties in hexane cracking also laid a solid foundation for the study of the catalysts on light oil cracking in industry.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-10
·
IF 6.408
Dai Yin,Jiang Wei,Zheng Yani,He Pei,Zhu Ruizhi,Fei Jianwen,Xu Wei,Liu Chunbo,Hong Junli
A selective method for the determination of myosmine (a tobacco alkaloid) was developed using molecularly imprinted polymers (MIPs) based on Fe 3 O 4 @SiO 2 and PAMAM dendrimers. Fe 3 O 4 @SiO 2 with excellent magnetism and rapid separation performance was chosen as carrier for the MIPs. Moreover, the MIPs modified with PAMAM dendrimers exhibited a regular structure and abundant functional groups, which improve the efficiency of imprinting sites. The myosmine concentration was measured by HPLC with PDA detector, and the UV detection wavelength was set to 200 nm. The linear range of this assay was 13.2–400 mg/L with a correlation coefficient of 0.999, and the detection limit was 4.0 mg/L (S/N = 3). The MIPs have been used for the determination of myosmine in cigarettes, and the recovery range was 84.2–93.5%, with RSD values in the range 0.41–3.1%. In conclusion, our MIPs combine advantages of simple preparation and remarkable selectivity, which gives them excellent application prospects for the sensitive determination of trace myosmine in tobacco products. Graphical abstract
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Sisi Ma,Wenying Shi,Hongbin Li,Yifeng Zhang
Inspired by the natural nacre structure, we propose a new strategy to fabricate mineralized, multiple crosslinked hydrogel membranes with the “rigid silica in soft polymer” nacre-like structure. In-situ SiO 2 nanoparticles (NPs) and polyvinyl alcohol/sodium alginate (PVA/NaAlg) are used to simulate the rigid “bricks” and soft “mortar” compositions of nacre, respectively. The nacre-like mineralized (PVA/CaAlg/SiO 2 ) membrane showed a higher tensile strength of 4.1 ± 0.08 MPa, excellent pure water flux of 170 ± 3 L/m 2 h, and an oil/water rejection rate of 99 %. The interwoven hierarchal structure, similar to nacre, was determined by SEM analysis . In addition, incorporating SiO 2 NPs increases the anti-swelling, roughness, and hydrophilicity of the membranes. PVA/CaAlg/SiO 2 membrane exhibited excellent superhydrophilicity (WCA value was 0°) and superoleophobicity underwater (OCA value was 162°). PVA/CaAlg/SiO 2 membrane also showed excellent separation performance for water-soluble organic pollutants and can be used for dye separation with rejection efficiencies of 99.5 %, 99.1 %, and 98.3 % for Congo red (CR), Alizarin red (AR), and Sunset yellow (SY), respectively. Moreover, PVA/CaAlg/SiO 2 membrane had outstanding long-term filtration and antifouling performance. The biomineralization-inspired structure provides a promising technique that can be used to prepare high-performance organic-inorganic membranes with great promise for wastewater separation application.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 10
·3513-3520
·
IF 6.4
Guangyang Bao,Wenyuan Yu,Qianqian Fu,Jianping Ge
An electrically responsive photonic crystal (ERPC) in weak polar media showed good performance due to less screening of Coulombic interaction, but its synthesis was a challenge because of the difficulty in fixing the amount of charge-controlling agent and water. Here, an SiO2/aniline (ANI) weak-polar EPRC was fabricated by a simple process without using any charge-controlling agent. As an alkaline weak polar solvent, aniline not only helps to disperse the particles in solution but also renders a particle with high surface charge by taking a proton away from the silanol group, both of which favor the formation of an ERPC in a weak polar system. Compared to reported ERPCs, the SiO2/ANI ERPC possessed a broad reflection wavelength tuning range (230 nm) under a low working potential (1.4 V) due to less screening of Coulombic interaction. The low working potential further relieved the decrease in color intensity under large lattice compression and improved the long-term stability and reversibility of the reflection signals in electrical tuning.
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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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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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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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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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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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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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