Advanced Materials Interfaces
·
2022
·Vol. 9
·期 5
·2101857
·
IF 6.389
Yinghao Zhang,Di Wen,Mengjia Liu,Yun Li,Yuan Lin,Kun Cao,Fan Yang,Rong Chen
Stretchable encapsulation plays a crucial role in expanding the applications of flexible electronics, particularly the large-area flexible displays. In this work, polydimethylsiloxane (PDMS) hybrid films with high stretchability, excellent transparency, and good barrier property are achieved by a simple process of SiO 2 doping and atomic layer infiltration (ALI). The doped SiO 2 improves the mechanical property and serves as reaction sites for the Al 2 O 3 infiltration. A clear “nucleation-filling-coating” mechanism of Al 2 O 3 ALI is proposed and elaborated in detail by in situ quartz crystal microbalance. The optimized PDMS hybrid films exhibit a relatively low water vapor transmission rate (WVTR) value of 1.81 × 10 −3 g m −2 day −1 and excellent mechanical reliability, where after 1000 cycles of the fatigue stretching test at 1% tensile strain the WVTR only slightly increases to 2.01 × 10 −3 g m −2 day −1 . Furthermore, the patterned quantum dots encapsulated with PDMS hybrid films still retain more than 50% photoluminescent intensity even after the stretching and storage in deionized water for 2400 h, which is ≈80 times longer than the pristine ones. Therefore, the proposed combined method of SiO 2 doping and ALI modification has great and practical implications for stretchable encapsulations for future flexible electronics.
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高影响因子
Crystals
·
2023
·Vol. 13
·期 8
·1261
·
IF 2.7
Zhen Pei,Haixiao Huang,Xingzhong Guo,Jinming Zhang,Mingxing Chen
MgO–Al2O3–SiO2(MAS) glass–ceramics with controllable crystalline phases were successfully prepared using the melting method followed by heat treatment. The effects of the main components of glass on the crystallisation kinetics, nucleation, crystallisation and properties of glass–ceramics were investigated in detail. As the Al2O3and MgO contents increase and SiO2content decreases, the crystallisation peak temperature and activation energy of MAS glass decrease, while the crystal growth tends to follow a homogeneous nucleation crystallisation. The MAS glass nucleation temperature and time increase with higher concentrations of Al2O3and MgO and with a lower SiO2concentration. Mg2(Al4Si5O18) indialite and MgAl2O4spinel precipitate simultaneously in the MAS glass after crystallisation; the relative proportion of crystalline phases is related to the composition and crystallisation temperature. A higher SiO2content allows the formation of a dominant indialite phase, while higher MgO and Al2O3contents promote the formation of a dominant spinel phase. The MAS glass ceramic with a greater indialite phase has good dielectric properties with a dielectric constant of 6.499 and dielectric loss of 0.0064, while that of a higher spinel phase possesses improved mechanical properties, with a Vickers hardness of 715 Hv and a bending strength of 244.9 MPa.
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Catalysis Science & Technology
·
2021
·Vol. 12
·期 2
·606-612
·
IF 6.119
Yuqing Shao,Zhaolin Dou,Xiaoyu Liang,Xinxin Zhang,Min Ji,Min Pang,Min Wang,Xinkui Wang
The photocatalytic reduction of CO2 into valuable fuels and sustainable energy has a promising future, yet remains a challenge due to low charge separation efficiency and inadequate active sites. We find that ZnIn2S4-loaded secondary amine-functionalized organic silica (ZnIn2S4/NH–SiO2) was effective for visible-light driven CO2 photocatalytic reduction. The ZnIn2S4/NH–SiO2 with 40% ZnIn2S4 content achieves a CO production rate of 1304.8 μmol g−1 h−1 at room temperature, which is about 3 times higher than that of pristine ZnIn2S4. The thin ZnIn2S4 nanosheet accelerates the separation of photogenerated electron pairs, and the amine groups on ZnIn2S4/NH–SiO2 act as active sites for adsorption and activation of CO2, hence facilitating the photoreduction of CO2.
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SOLAR ENERGY
·
2021
·
IF 5.742
Abdelaal S.A. Ahmed,Wanchun Xiang,Fatma S.M. Hashem,Xiujian Zhao
Platinum (Pt)-based counter electrodes (CEs) are promising electrocatalysts for dye-sensitized solar cells (DSSCs). However, replacing the expensive Pt with low-cost materials and comparable catalytic activity still a big challenge. Here, we prepared CB-SiO 2 composites by blending various weights of SiO 2 (1, 3, and 5 wt%) with carbon black (CB), followed by screen printed onto the FTO substrate to utilized as CEs for DSSCs. In comparison with pure CB, CB-SiO 2 composite CEs showed higher transferability and higher electrocatalytic activity toward I 3 - / I - redox couple. Among all, CB-SiO 2 -1% composite CE with 4 µm showed the best catalytic performance, and the related DSSC showed a power conversion efficiency of 6.38%. Increasing the CE thickness significantly enhances the catalytic ability and the total performance of the assembled devices, whereas the power conversion efficiency of the DSSC with CB-SiO 2 -1% composite CE in 8 µm thick was 7.99%, which is close to that achieved by Pt-based device under the same conditions.
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Nanomaterials
·
2021
·Vol. 11
·期 12
·3395
·
IF 5.076
Wei Zhang,Yanli Lu,Yang Zang,Jinhui Han,Qingyun Xiong,Jinping Xiong
In this study, a new method for synthesizing Ag-NaYF4:Yb3+/Er3+@ SiO2nanocomposites was introduced. Using a hydrothermal method, the synthesized Yb3+- and Er3+-codoped NaYF4up-conversion luminescent materials and Ag nanoparticles were doped into up-conversion nanomaterials and coated with SiO2up-conversion nanomaterials. This material is known as Ag-UCNPs@SiO2, it improves both the luminous intensity because of the doped Ag nanoparticles and has low cytotoxicity because of the SiO2coating. The morphology of UCNPs was observed using scanning electron microscopy (SEM), and the mapping confirmed the successful doping of Ag nanoparticles. Successful coating of SiO2was confirmed using transmission electron microscopy (TEM). Fluorescence spectra were used to compare changes in luminescence intensity before and after doping Ag nanoparticles. The reason for the increase in luminescence intensity after doping with Ag nanoparticles was simulated using first-principles calculations. The cytotoxicity of Ag-UCNPs@SiO2was tested via the cell counting kit-8 (CCK-8) method, and its imaging ability was characterized using the micro-CT method.Keywords:up-conversion;nanomaterials;CT imaging
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51810
·
IF 3.125
Songling Chen,Yanyu Han,Chunyu Chen,Hongdou Liu,Hongtao Zou
Nearly 100 million tons of spent mushroom substrates (SMS) are discarded annually in China, which causes a series of environmental pollutants. To improve the nitrogen (N) use efficiency of and to shift dependence away from petroleum-based products, a novel bio-based epoxy coated urea was successfully developed. The bio-based epoxy coating was synthesized from the liquefied SMS and bisphenol-A diglycidyl ether. Subsequently, both nano-SiO 2 and organosilicon were employed to modify the bio-based epoxy and increase its hydrophobicity. Water absorption, ammonium adsorption, and water contact angles of the bio-based epoxy coatings were investigated. The nutrient release behaviors of the bio-based epoxy coated urea in water were also investigated and the modification mechanisms were explored by Fourier transform infrared, scanning electron microscopy–energy-dispersive X-ray spectroscopy and thermogravimetric analysis. The results revealed that the hydrophobic ability of the nano-SiO 2 and organosilicon dual modified bio-based epoxy coated urea coating was significantly enhanced and that its nutrient release longevity was increased to 56 days. Therefore, this work demonstrated that bio-based epoxy coated urea with superior release characteristics exhibited great potential in modern agricultural applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Liwei Shen,Guosheng Ai,Yiling Ao,Guanxin Zeng,Ying Yang,Xuening Feng,Zejun Zhang,Huaikui Yuan,Fan Ye,Yuanzhu Mi
Water-in-oil emulsions are frequently encountered in petroleum extraction. In this paper, CRB-SiO 2 , a cost-efficient and environmentally friendly demulsifier, was synthesized by a two-step method. The chemical structure and surface morphology were analyzed by flourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. The effect of salinity, concentration, temperature and pH value on the demulsification efficiency (DE) was investigated in detail. The DE reached 93.98% with 600 mg/L of CRB-SiO 2 at 70 °C. Also, it had an excellent tolerance of salt, acid and alkali. Moreover, the demulsification mechanism was also studied through three-phase contact angle, interfacial tension and self-assembly of interfacial membrane. CRB-SiO 2 has an amphiphilic structure and lower interfacial tension (IFT) around 37.75 mN/m. Accordingly, it can be easily adsorbed at the water-oil interface, destroying the interface membrane and initiating the separation of oil and water. In summary, CRB-SiO 2 has a potential application in petrochemical industry.
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IRONMAKING & STEELMAKING
·
2021
·
IF 1.679
Liang Yu,Wenbo Jiang,Shaopeng Gu,Ping Tang,Zhe Wang,Guanghua Wen
The reaction behaviour and mechanism of carbon and mould fluxes during the heating process were deeply considered through TG-FTIR, XRD, DSC, and SEM techniques. The results showed that: there were four main stages of weight loss for slags during heating process. One hundred to 300 °C and 300–500°C were the volatilization of free water and bound water, respectively. Five hundred to 800°C was the decomposition process of carbonate. However, at 800–1400°C, CaO–SiO2–CaF2 slag was the reaction of slag component themselves. CaO–SiO2–CaF2–C series slags were the reaction behaviour between carbon and slags (C and Ca2SiO4, Ca4Si2O7F2). The DSC and SEM analysis illustrated that the solid phase reaction temperature range of CaO–SiO2–CaF2–C being 1320–1370°C was larger than that of CaO–SiO2–CaF2 being 1070–1250°C. Additionally, CaO–SiO2–CaF2 slag was completely molten at 1400°C, while CaO–SiO2–CaF2–C did not, suggesting that the sintering and melting process were suppressed by carbon.
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MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Shenghang Xu,Tingting Lu,Kaijie Shen,Junjie Lan,Bin Hu,Huibin Zhang,Yiping Tang,Huazhen Cao,Guoqu Zheng
Ti–5Al–5V–5Mo–3Cr (Ti-5553) metastable β titanium alloy possesses excellent high temperature mechanical properties , however, the oxidation resistance is fairly poor. In this work, a SiO 2 coating was prepared on Ti-5553 alloy by cathodic electro-deposition. The high temperature oxidation resistance of the deposited SiO 2 coating was evaluated at 800 °C. The results show that the optimal current density of deposition is −2.0 mA/cm 2 for 300 s, and the thickness of the compact SiO 2 film reaches 5.5 μm. The SiO 2 film can react with Ti-5553 substrate and form protective Ti 5 Si 3 layer, which inhibits the inward diffusion of oxygen from air, leading to the remarkable improvement of oxidation resistance. The mass gain is only 1.13 mg/cm 2 after oxidation at 800 °C for 80 h. The oxide scale consists of TiO 2 , Al 2 O 3 , V 2 O 5 , Cr 2 O 3 and SiO 2 , but Mo 2 O 5 is absent. The occurrence of Kirkendall voids as well as the cracks induced by internal stress should be responsible for the deterioration of oxidation resistance, which may provide extra channels for oxygen diffusion inwards the substrate.
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WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 93
·期 12
·2903-2913
·
IF 1.946
Pan Xiong,Siqi Fan,Jinshan Song,Qizhou Dai
In this study, a magnetic nanocatalyst (Fe 3 O 4 @SiO 2 @CeO 2 ) was prepared and applied in the catalytic ozonation of methyldopa (MD). The effects of operational parameters on catalytic ozonation performance were investigated, including ozone dosage, catalyst dosage, initial MD concentration, and pH. The removal of MD was 45.2% in ozonation, whereas the efficiency was achieved to 83.0% with the addition of Fe 3 O 4 @SiO 2 @CeO 2 . The results showed that Fe 3 O 4 @SiO 2 @CeO 2 could significantly improve the catalytic ozonation performance. And the enhanced mechanism study showed that it was attributed to promotion of ozone decomposition to generate hydroxyl radical. The reaction model was explored, and the reaction rates were calculated for the MD degradation in catalytic ozonation. A higher degradation efficiency of MD in catalytic ozonation was attributed to the enhanced surface effect of the catalysts, which was confirmed by using TBA, PO 4 3− , and p -BQ as scavengers of hydroxyl radical, surface reaction, and superoxide radical. The hydroxyl radical and superoxide radical played an important role in the degradation of MD. The mechanism of catalytic ozonation by Fe 3 O 4 @SiO 2 @CeO 2 was discussed via X-ray photoelectron spectroscopy (XPS) spectra and experimental data. Practitioner Points Fe 3 O 4 @SiO 2 @CeO 2 could promote the decomposition of ozone to produce hydroxyl radicals. High degradation efficiency of methyldopa with Fe 3 O 4 @SiO 2 @CeO 2 was achieved. A mechanism of catalytic ozonation with Fe 3 O 4 @SiO 2 @CeO 2 was proposed.
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THERMOCHIMICA ACTA
·
2021
·
IF 3.115
Lei Liu,Xiang Cheng,Xiwang Miao,Ying Zhang,Min Guo,Fangqin Cheng,Mei Zhang
In this work, a series of SiO 2 @n-octadecane capsules were prepared by one step emulsion polymerization, the influence of emulsifying speed, ammonia and TEOS contents, reaction temperature, concentration of emulsifier and the amount of PVP on the size, structure and performance was detailed investigated. It can be seen from SEM characterization that among these factors emulsification speed had the greatest influence on capsule size, while followed by the ammonia and TEOS content. According to TEM results, the ammonia and TEOS contents were the most important factors on the structure (shell thickness and surface smoothness) of the capsules, attributing to ammonia and TEOS were the catalyst and reactant of hydrolysis polymerization, respectively. Generally, the crystallinity of the samples became worse as the size decreased. DSC results showed that excessive ammonia or TEOS caused a significant drop in the enthalpy of the samples, furthermore, the enthalpy basically decreased with the attenuation of the inner radius of the sample. The target SiO 2 @n-octadecane capsule was sample C2 with high enthalpy (127.7 J/g), size of 1.62 μm, shell thickness of 68 nm, and smooth surface. More importantly, within the parameters studied, a series of SiO 2 @n-octadecane capsules were successfully synthesized with different enthalpy values (min 85.9 J/g, max 144.3 J/g), sizes ranging from 0.63–2.75 μm, shell thickness 32–79 nm and different smooth surfaces. Therefore, the controllable synthesis of SiO 2 @n-octadecane capsules within the above range can be achieved by simulating different parameters and their development.
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CARBON
·
2021
·
IF 9.594
Xufeng Jing,Yayan Xu,Haiyong Gan,Ping Hu,Chenxia Li,Jianqiang Qian,Junjie Zhang,Ying Tian,Shiqing Xu
Fluorescence of negatively charged nitrogen-vacancy color centers in nanodiamond is applied in nanoscale sensing. Here, we generated a stable transparent composite ND-SiO 2 film by introducing well-dispersed nanodiamonds into silica sol with sol-gel method and spin coating . The transmission electron microscope, X-ray diffraction and Raman curves all can demonstrate homogeneous dispersion of nanodiamond particles in the silicon dioxide film. The hybrid coating displayed significant temperature dependence by studying the fluorescence behavior from liquid nitrogen temperature to room temperature. With rising temperature, the red shift in zero phonon line position, reduction in intensity, extension in the full width at half maximum and decrease in amplitude were obviously typical characteristics. In addition, the sensitivity was 19 K Hz −1/2 at 80K, while it increased to 28 K Hz −1/2 at 300K.
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