Micro & Nano Letters
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2019
·Vol. 14
·期 3
·323-328
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IF 0.975
Jidong Wang,Zhijie Gu,Jialin Zhang,Xin Chen,Mengjuan Li,Yuan Yu,Mingqiao Ge,Xiaoqiang Li
In this work, a mesoporous structure TiO 2 /SiO 2 (M-TS) composite with excellent adsorption and photocatalytic properties was fabricated by a sol–gel process combined with calcination. The structure of the samples was characterised by scanning electron microscopy and Brunauer–Emmett–Teller analysis. The factors influencing the adsorption behaviours of methylene blue (MB) onto M-TS, including ingredient, dosage, initial concentration and temperature were investigated. The M-TS was produced by removing poly(vinylpyrrolidone) from the precursor gel was vital to the excellent adsorption capacity. Furthermore, the isotherm and kinetic data were fitted by using Langmuir and Freundlich isotherm models, pseudo-first-order and pseudo-second-order equations, and the intra-particle diffusion model. The Langmuir isotherm model and the pseudo-second-order kinetics were the most suitable models for describing the adsorption of MB onto M-TS. It was also found that the adsorption capacity of cationic dyes on M-TS is better than that of anionic dyes. The experimental results of adsorption and photodegradation proved that improvement of adsorption capacity enhances the decolourisation efficiency. This work shows that the M-TS could be used as an effective adsorbent and photocatalyst to remove cationic dyes from wastewater.
研究领域:
材料科学
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环境科学
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Mingxing Wang,Xiutong Wang,Youbo Nan,Hui Xu,Hui Zhou,Yanan Sun,Peijia Yi,Teng Yu
Raindrops are an abundant micromechanical renewable energy source in nature, and raindrop energy harvesting has always been a research hotspot. Traditional hydropower generation is not suitable for low-frequency energy harvesting, and it is difficult to realize distributed energy harvesting. The development of triboelectric nanogenerator (TENG) is a promising strategy for converting raindrop energy in the environment into electrical energy. Polydimethylsiloxane (PDMS) composite has received much attention due to its excellent chemical stability and insulating properties for TENG. However, the deficiency of the low output performance and insufficient hydrophobicity of PDMS limits the application of PDMS in droplet energy capture. Modification of PDMS can improve the droplet energy collection capability of the liquid–solid contact triboelectric (LS-TENG). In this work, a new approach to modifying polydimethylsiloxane (PDMS) as a hydrophobic negative triboelectric material using a high dielectric constant MXene and a hydrophobic nano-SiO 2 was reported. The as-prepared composites′ permittivity and triboelectric performance were remarkably promoted as compared to composites without interfacial modification. In addition, the use of composites for TENG assembly improved the open-circuit voltage and short-circuit current by a factor of 47.5 and 25.21, respectively, compared to pure PDMS. Application of the composite to the assembled TENG was employed as energy harvester to light up LEDs and charge a capacitor. In addition, a cathodic protection system was designed to demonstrate its potential application in the field of electrochemistry. This provides guidance for the practical implementation of TENGs in the field of electrochemical cathodic protection.
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Defence Technology
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2023
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IF 5.1
Xinli Ye,Hao Yu,Kai Zheng,Shan Li,Xiaomin Ma,Bangxiao Mao,Junxiong Zhang
The well-designed composite with satisfactory electromagnetic microwave absorption at high temperatures remains a serious challenge. Herein, we fabricated a resorcinol-formaldehyde/silica dioxide composite aerogel (RF/SiO 2 ) with a three-dimensional network structure using sol-gel, atmospheric pressure drying technique as well as heat-treated processes to achieve enhanced microwave absorption capabilities in the low frequency range. The pristine RF/SiO 2 aerogel presented a typical micropores structure with a surface area, porous volume, and density of 146.82 m 2 /g, 62.40%, and 0.28 cm 3 /g, respectively. Remarkably, the RF/SiO 2 aerogel showed an effective absorption bandwidth of 3.56 GHz and a minimum reflection loss value of −46.10 dB at 2.25 mm after being heat-treated at 1500 °C, while the maximum effective absorption bandwidth was 3.60 GHz at 2.30 mm. The intricate three-dimensional networks possessed remarkable impedance matching, multiple attenuation mechanisms, interfacial polarization, and dielectric loss, which were attributed to the exceptional ability to absorb electromagnetic microwaves. It offered a fresh approach to creating adaptable and effective microwave absorption materials in military defense.
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FIBERS AND POLYMERS
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2023
·Vol. 24
·期 12
·4279-4286
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IF 2.5
Zhou Jianhua,Niu Zhuanli,Xiao Anguo,Li Xiang
Materials with passive daytime radiative cooling (PDRC) have drawn more attention as a result of their potential for energy savings. We prepared SiO 2 -encapsulated ZnO@ZIF-8 (ZZS) particles and a radiative cooling coating containing ZZS particles. Owing to the polyhedron structure and the phonon-polarization resonance of ZZS particles, the ZZS fabric coating could reflect sunlight with 83% and radiate heat to outer space with 0.96. Compared with the ambient air, its average temperature decreased by 6.4 °C, and the human body under direct sunlight could avoid overheating 3.9 °C. In addition, the ZZS coated fabric after rubbing still had good PDRC and its average temperature increased by 1.38℃ higher than the original ZZS coated fabric. Owing to good PDRC property, hydrophobicity, mechanical properties and simple methods, the widespread usage of ZZS coated fabric for personal thermal management appears to be promising.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Zhiyan Ma,Yunlong Yu,Ke Wu,Yaping Song,Sen Liu,Xi Yang,Teng Fei,Tong Zhang
In this paper, a composite hydrogel film (Au/Me-SiO 2 /G) based on Au nanoparticles, mesoporous silica and gelatin was prepared, which can be used for low relative humidity (RH) detection. Au-1%/Me-SiO 2 /G exhibits a response of 423% in the range of 0.4–30% RH, a short response time of 28 s, a linearity of R 2 = 0.997, and good long-term stability. With the outstanding ability to adsorb water molecules, the sensor can detect NH 3 at room temperature and low humidity environment. The response of the sensor to NH 3 significantly increases with the humidity. At 30% RH, the initial impedance value of the sensor is as low as ∼6.6 MΩ, and the response to 50 ppm NH 3 is 78%. In addition, an egg storage scenario was simulated, and the water loss in eggs was monitored simultaneously by the prepared humidity sensor and a commercial sensor. The results demonstrate the practical application detection ability of the prepared humidity sensor.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Site Luo,Yangjie Li,Wei Yang,Wenjing Gao,Haihu Yu,Niu Huang
A simple yet powerful approach to obtain structural color is the amorphous assembly of colloidal spheres, which is also referred to as the amorphous photonic structure or photonic glasses (PGs). Additionally, the functionalization of the colloidal spheres as building blocks can further endow the resulting PGs with multifunctions. Herein, we have developed a facile strategy to prepare SiO2 colloidal spheres with concentrically embedded carbon dots (CDs). Notably, the CDs are prepared and silane-functionalized simultaneously, which enables the perfect incorporation of CDs into the Si–O network during the Stöber reaction and thus leads to the formation of a concentric SiO2/CD interlayer within the obtained SiO2 spheres. Moreover, the obtained SiO2/CD spheres can be applied as photonic pigments by assembling them into PGs, which exhibit structural color under daylight and fluorescence under UV illumination. With incorporation of carbon black, the structural color saturation and fluorescence intensity can be further manipulated. Owing to the combination of structural colored PGs and fluorescent CDs, our study can offer inspiration for color- and fluorescence-related applications such as sensing, in vivo imaging, LEDs, and anticounterfeiting.
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Journal of Energy Storage
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2023
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IF 9.4
Yujiao Li,Zhuoni Jiang,Fangfang He,Zhengguo Chen,Xiaoan Li,Peng Wang,Guansong He,Xinghua Zhu,Wenbin Yang
In this study, we successfully designed and synthesized a series of thermochromic phase change microcapsules with different core-shell ratios. Reversible thermochromic phase-change material systems (TC-PCMs) with excellent color-change performance were prepared as the core materials by selecting the components of the three-component thermochromic compound, and then the SiO 2 shell was assembled on the interface of TC-PCMs droplets in oil-water emulsion by interfacial polymerization . The microstructure and chemical composition of the resulting microcapsules were investigated by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). SEM images showed that these microcapsules have spherical shape and well-defined core-shell structure. According to differential scanning calorimeter (DSC) and thermogravimetric analysis (TG) tests, these bifunctional microcapsules exhibited excellent heat storage and release properties, high heat storage capacity and good thermal stability . The melting and solidifying enthalpies of microPCMs were 181.3 J/g and 174.5 J/g, respectively. In addition, the resulting microcapsules have good thermochromic reversibility with a color transition temperature of 52 °C. The thermal conductivity of TC-PCMs was enhanced by 132.4 % after loading SiO 2 shells. Furthermore, these microcapsules exceeded the target temperature and successfully achieved the thermochromic function. The bifunctional microcapsules developed in this study have great potential for application in textiles, smart material coatings , luminescent thermal sensors and anti-counterfeiting.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2023
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IF 2.2
Yu Zhang,Jiazhe Kuang,Bin Li,Yuanzhu Mi,Ying Yang,Xuening Feng
In this work, a PAMAM@SiO2 demulsifier was synthesized by the reaction of a hyperbranched poly (amido amine) (PAMAM) and KH570 modified SiO2. The structure, morphology and composition of PAMAM@SiO2 were characterized by FT-IR, SEM and EDS. The effect of the concentration of PAMAM@SiO2, salinity and temperature on the demulsification performance was systematically studied. The results showed that the transmittance of aqueous phase after demulsification could reach as high as 92.1% at optimal conditions, and corresponding oil removal rate was 99.53%. Interfacial activity, three-phase contact angle, self-assembly of interfacial film and dynamic interfacial tension were investigated to explore the demulsification mechanism. Also, the aggregation process of oil droplets in emulsion was observed with a microscope. It indicates that the PAMAM@SiO2 demulsifier has a potential application in the treatment process of oily wastewater.
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MRS Advances
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2023
·Vol. 8
·期 4
·103-107
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IF 0.8
Martinez E. Gándara,Villarreal N. Elizondo,Coronado K. A. Chavez,Cuellar E. M. López,Hernández A. Guzman,Delgado D. Martínez,Delgado F. Paraguay
The aim of this work is the synthesis of SiO 2 nanoparticles starting from Tequila as green chemistry, which implies something novel. Tequila was used as a capping, a reducer, a surfactant and stabilizer from a solution of silicon tetraacetate, deionized water, acetone, and sodium hydroxide. The structure, optical absorption, and morphological analysis of these nanoparticles were studied using X-ray diffraction (XRD) and UV–Visible spectrophotometer, and TEM. The XRD analysis indicated an amorphous phase of SiO 2 nanoparticles; the size of the synthesized nanoparticle is about 20 ± 30 nm and optical absorption analysis indicated a peak in the 260 nm range. More than 175 constituents were found in Tequila and the most common constituents were 2-methyl-1-butanol and 3-methyl-1-butanol. These higher alcohols are a good disperser and they could not only increase the number of nucleation sites but also reduce the rate of grain growth. A green and cost-effective method for the synthesis of SiO 2 NPs using Tequila which focused on the utilization of a novel and original way, was demonstrated.
Graphical abstract
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Gels
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2022
·Vol. 8
·期 11
·744
·
IF 4.432
Baolu Shi,Long Xie,Bin Ma,Zhiliang Zhou,Baosheng Xu,Lijie Qu
SiO2aerogels have attracted extensive attention due to their unique structural characteristics, which exhibit many special properties, especially good optical transparency. As far as we know, the sol-gel stage during the synthesis of aerogel plays an important role in the construction of the gel skeleton. In this study, we adjusted the amount of silicon source and catalyst to explore the best scheme for preparing highly transparent SiO2aerogels, and further clarify the effects of both on the properties of SiO2aerogels. Results indicated that the pore size distribution was between 10 and 20 nm, the thermal conductivity was between 0.0135 and 0.021 W/(m·K), and the transmittance reached 97.78% at 800 nm of the aerogels, better than most studies. Therefore, it has the potential to be used in aerogel glass for thermal insulation.Keywords:SiO2aerogels;high transparency;thermal insulation;mesoporous materials
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Chichi Ruan,Guanyu Chen,Yuanshneg Ma,Chunhua Du,Chunxiang He,Xinyu Liu,Xin Jin,Qilin Chen,Song He,Yajun Huang
Efforts to develop a green, inexpensive and effective adsorbent are crucial for eliminating antibiotics in polluted water. The sorption capacity of the as-prepared polyvinyl alcohol (PVA)-assisted cellulose nanocrystals/SiO 2 (CNCs/SiO 2 ) composite aerogel to ciprofloxacin (CIP) rises with the increase of temperature and initial concentration. Reverse trend of sorption capacity can be found when increasing the adsorbent dosage of adsorbent. The optimal pH value for the sorption is proved to be 4. It’s found in the uniaxial compression test that the maximum load that PVA-assisted aerogels can withstand is nearly 100 times than that of non-PVA aerogels. Sorption results confirm that the Pseudo-second order (R 2 = 0.9885) and Langmuir models (R 2 = 0.9959) fit well to sorption kinetics and equilibrium data, respectively. The rate constant differs from the initial concentration of CIP according to the Pseudo-second order model. The composite aerogel sorption capacity of Langmuir (q max ) for CIP was 163.34 mg·g −1 . The thermodynamic studies showed that the sorption process is endothermic with the value of enthalpy change of 41.032 kJ/mol. Hydrogen bonding , π–π interaction, hydrophobic and electrostatic interactions are the dominant mechanisms of CIP sorption by the PVA-assisted CNCs/SiO 2 composite aerogel.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mengmeng Yang,Yang Lixia,Zhaofeng Chen,Wu Qiong,Yapeng Wang,Tianlong Liu,Manna Li
Herein, a novel flexible SiO 2 aerogel composite nanofiber membrane with strawberry-like structure and excellent thermal insulation properties, in which SiO 2 aerogel particles act as thermal insulation filler, was prepared by electrospinning technology. With the addition of nano-pore structure SiO 2 aerogel particles, the heat transfer path of the fibers inside the membrane became discontinuous, endowing the as-prepared membrane an ultra-low thermal conductivity of 30.3 mW/(m⋅K) and large surface area of 240 m 2 /g. Moreover, the nanofibers membrane also possesses the combined merits of excellent fire resistance, high-temperature stability, and temperature-invariant flexibility, rendering it a promising in the application of insulation and gas adsorption. The successful preparation of this flexible nanofiber membrane paves a new way to design materials with excellent thermal insulation and adsorption properties.
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