CERAMICS INTERNATIONAL
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2025
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IF 5.6
Ou Hai,Peng Li,Xin An,Weikang Dong,Tong Li,Zechuan Qi,Yuanting Wu
In order to broaden the application field of long afterglow materials, it is a challenge to realize high stability and multicolor properties of long afterglow materials. The photoconversion method is a condition that enables simultaneous afterglow color shifts, however, the stable and efficient photoconversion agent is an urgent problem. This study propose a strategy to synthesize CsPbBr 3 quantum dots (QDs) directly within porous SiO 2 on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS). The resulting composites achieve a shift in emission and afterglow color from blue (about 468 nm) to green (about 520 nm), and in the UV irradiation for 8 days, the luminous intensity is almost unaffected, in the air exposure for 3 months, the luminous intensity can still be maintained at more than 80 % of the initial value. Since the synthesized composite material is a powder, it can be mixed with various media. Composite materials can be homogeneously mixed with coatings, resulting in coatings with a variety of luminescent colors and producing effective multicolor luminescence, which has significant potential in the field of luminescent coatings and anti-counterfeiting.
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CONSTRUCTION AND BUILDING MATERIALS
·
2024
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IF 7.4
Hongye Lu,Yulin Wang,Peng Zhang,Qingpeng Lin,Zongyan Chen,Renhui Qiu,Xiaoyan Zheng
Alkali-activated slag mortars with recycled fine aggregate (AASRMs) have attracted high concern due to their promising properties, low carbon emissions, and solid waste utilization. However, high shrinkage made the AASRMs susceptible to cracking, limiting their application in construction industry. This study intends to use green bamboo cellulose nanofibers (CNFs) as reinforcement to overcome the problem. Two CNFs surface modifications including nano-SiO 2 coating and KH590 silane were adopted to improve the dispersibility of CNFs and their compatibility with AASRM matrix. Fourier transform infrared spectroscopy, thermal gravimetric analysis, Zeta potential, and scanning electron microscopy were adopted to characterize the CNF modification. The results showed that adding CNFs evidently improved the mechanical strengths, and reduced the chemical and dry shrinkages of AASRMs. CNF to modifications improved their dispersibility within the matrix, strengthened the fiber/matrix interface bonding, and refined the pore structure of the mortars, enhancing the overall performance of AASRMs. Particularly, the incorporation of 0.3 wt% nano-SiO 2 - and KH590-modified CNFs into AASRMs enhanced the 28-day flexural strength by 15.5 % and 18.3 %, respectively, compared to the control without CNFs. Moreover, these modifications significantly reduced the 14-day dry shrinkage by 49.9 % and 37.1 %, with nano-SiO 2 proving more effective than KH590 in mitigating dry shrinkage. This study offers an effective and green strategy for enhancing the performance of AASRMs by using renewable materials, being beneficial for their large-scale application as sustainable building materials.
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CATALYSIS LETTERS
·
2025
·Vol. 155
·期 3
·1-11
·
IF 2.4
Wang Xiuqing,Yan Ruiyao,Fu Jianyu,He Yan,Zheng Jiahuan,Liu Liu,Zhou Na
The practical application of Cu 2 O in the field of photoelectrocatalytic (PEC) hydrogen production has been limited by its relatively low photoconversion efficiency and electron mobility. Plasmonic metal nanoparticles have been utilized to enhance the charge separation of semiconductors through resonance energy transfer from metal nanoparticles to semiconductors. In this study, Ag nanosphere (Ag NS)@SiO 2 were combined with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation. The microstructures of the Ag@SiO 2 @Cu 2 O nanocomposites were regulated by controlling the thickness of SiO 2 interlay and Cu 2 O shell in order to optimize the PEC efficiency. It was found that Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited the highest photocurrent intensity, showing 3.3 times, 11.9 times, and 17.8 times higher values than pure Cu 2 O, pure Ag NS, and AgNS@SiO 2 NPs respectively. Furthermore, the photoelectrocatalytic hydrogen production velocity of Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs was around 25 mmol·g −1 ·h −1 , which has been improved around 4.2 times compared to pure Cu 2 O. This enhanced performance is attributed to plasmon-induced resonance energy transfer from Ag metal nanoparticles to Cu 2 O semiconductor, which may improve the separation efficiency of electron–hole pairs and lead higher photoelectrocatalytic efficiency. Graphic The Ag NS@SiO 2 was integrated with Cu 2 O to form triple core–shell nanocomposites, aiming to enhance the photoelectrochemical activity of Cu 2 O under visible-light irradiation through plasmon-induced resonance energy transfer from Ag to Cu 2 O. And their photoelectrocatalytic performances were optimized by controlling the thickness of SiO 2 interlay and Cu 2 O shell. Ag NS@SiO 2 (5 nm)@Cu 2 O (29 nm) NCs exhibited superior photocurrent intensity and enhanced photoelectrocatalytic hydrogen production rate compared to pure Cu 2 O.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Li Hongji,Wang Xiaonan,Wang Zirun,Wang Yan,Dai Jiangdong,Gao Lin,Wei Maobin,Yan Yongsheng,Li Chunxiang
A new method is described for the determination of the pesticide λ-cyhalothrin (LC). It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates. Firstly, the surface of the SiO 2 @rGO@Ag composite was modified with self-polymerized dopamine. Secondly, surface-initiated polymerization was carried out to prepare a molecularly imprinted polymer (MIP) using LC as the template. The use of this SiO 2 @rGO@Ag-MIP allows for excellent SERS based detection and has high selectivity for LC. The Raman intensity and LC concentration present perfect linear relationship between 10 −5 to 10 −9 mol L −1 and the detection limit is 3.8×10 −10 mol L −1 . All the procedures are conducted in aqueous or ethanol solution.
Schematic of a new method for determination of the pesticide λ-cyhalothrin. It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates.
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APPLIED THERMAL ENGINEERING
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2025
·
IF 6.9
Hao Wang,Liu Yang,Xiaoke Li
Solar energy, recognized for its abundant and clean attributes, is a burgeoning renewable resource. Nanofluid photothermal conversion technology with volume absorption properties has been rapidly developed in recent years. This research optimized the performance of Ti 3 C 2 (MXene) nanofluid in solar photothermal conversion by integrating SiO 2 nanoparticles to form a composite nanofluid. The stability, thermal conductivity, and photothermal properties of the Ti 3 C 2 /SiO 2 nanofluids were comprehensively evaluated. The nanofluids demonstrated high stability, as evidenced by Zeta potentials all above 40 mV. Furthermore, the thermal conductivity of the nanofluids escalated with an increase in SiO 2 content. Specifically, the thermal conductivities of the composite nanofluids experienced an approximate 9 % enhancement when the temperature was elevated by 25 °C. The composite nanofluid had better light absorption because of SiO 2 nanoparticles’ forward scattering ability. The most efficient mixture (Ti 3 C 2 : 40 ppm and SiO 2 : 1000 ppm) reached a 67.35 % photothermal conversion efficiency, which is 5 % higher than the Ti 3 C 2 nanofluid alone at the same concentration. Rather than solely enhancing light absorption, this study provides a new pathway to improve the photothermal conversion efficiency of nanofluids by strengthening scattering. This contributes to enriching the theoretical and practical understanding of nanofluids in the field of photothermal conversion, offering scientific evidence and technical support.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jialong Ou,Yuanhao Wang,Fei Liu,Tianxiang Zhao
The development of metal-free and high-efficiency heterogeneous catalysts for the chemical conversion of CO 2 into value-added chemicals is crucial for carbon cycling. Here, we report the synthesis of a four-armed urea-functionalized ionic salt that incorporates active bromide ions (Br − ) and urea groups. This salt was subsequently grafted onto ordered mesoporous SiO 2 (SBA-15) to catalyze the cycloaddition reaction between CO 2 and epoxides. The impacts of structure features, grafting density of the urea-functionalized ionic salts, and pore size of SBA-15 on catalytic performance were systematically investigated. The results obtained emphasize that SBA-15–5@TEU(1:1) demonstrates remarkable synergistic catalytic efficacy, facilitating the efficient transformation of various epoxides into cyclic carbonates through cycloaddition reactions in the absence of both solvents and cocatalysts. Notably, this catalyst achieves a maximum yield of up to 99%. Additionally, SBA-15–5@TEU(1:1) demonstrates excellent reusability, with no significant decrease in catalytic activity observed over multiple cycles. Mechanistic studies further elucidate the crucial roles of Br − and urea groups in facilitating the synergistic catalysis of CO 2 cycloaddition reaction. This work presents novel insights the design of metal-free and co-catalyst-free heterogeneous catalysts for efficient CO 2 conversion.
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Science Bulletin
·
2025
·
IF 21.1
Duo Pan,Ziyuan Han,Junting Lei,Yutao Niu,Hu Liu,Sunmi Shin,Chuntai Liu,Zhanhu Guo
With the rapid progress of aerospace frontier engineering, the extreme space thermal environment has brought severe challenges to astronauts’ space suits, putting forward higher requirements for thermal protection materials. On this basis, a unique core-shell structured hexagonal boron nitride (h-BN)/silicon dioxide (SiO 2 ) nanofiber membrane (HS) was prepared using the coaxial electrospinning method, of which both the thermal insulation SiO 2 nanofiber cortex and the passive radiation cooling (PRC) h-BN nanofiber core make it a promising dual-effect thermal management material. Especially, when the amount of h-BN is 0.9 g, the resultant HS (HS 0.9 ) exhibits astonishing low thermal conductivity of 0.026 W m −1 K −1 and high reflectivity and emissivity of exceeding 90% over an extremely wide range. The expected dual-effect thermal management performance enables the HS to have an ideal cooling effect under both high sunlight intensity and strong light radiation. In addition, HS also shows excellent flame retardant performance arising from the excellent high-temperature stability of h-BN and SiO 2 . What is more, the tensile strength of HS 0.9 was also significantly increased from 0.42 to 7.2 MPa by encapsulating polyimide through vacuum filtration. Therefore, the research results of this work provide innovative highlights for high-temperature protection in daily life and even extreme space environments.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Ting Xu,Shuang Wang,Tao Wang,Xin Li,Yanli Chen,Qiong Wu,Lili Yang,Xiaoyan Liu,Maobin Wei,Jian Cao
Coupling Ag NPs and direct Z-scheme heterojunction in Fe 3 O 4 @SiO 2 @ZnO-PDA-Ag photocatalysts (FSZ-PDA-Ag) were constructed via the self-polymerization of dopamine. The effects of the loading amounts of Ag NPs on the structure, morphologies, and properties of the photocatalysts were investigated. Under ultraviolet and visible light irradiation, FSZ-PDA-Ag5 exhibited superior photocatalytic activity for tetracycline degradation. Direct Z-scheme ZnO-PDA heterojunction formed in FSZ-PDA-Ag could promote the transfer efficiency of electrons, and then inhibit the recombination of photo-generated charges. Meanwhile, the appropriate load of Ag NPs acted as another conductive channel to further facilitate the electrons transfer , which could extend the lifetime of the photo-generated charges. Thus, the multiple pathways of electrons transfer resulted in the enhanced photocatalytic activity , the degradation mechanism of FSZ-PDA-Ag5 was explored in detail. Moreover, this photocatalyst possessed superior cycling stability and reusability for the wastewater purification. This study may provide a reference for designing efficient and stable photocatalysts.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Run Gan,Yanqing Zu,Tong Zhang,Chengzhang Yang,Chujie Wang,Binglin Zeng,Peitao Liu,Xiaodong Li,Fengbo Han,Yu Qian,Lei Zhao,Ailing Feng,Zhaoxin Wu
The lead-free perovskite Cs 2 ZrCl 6 has recently attracted huge interest in X-ray imaging application. However, it generally exhibits unsatisfactory stability originating from the intrinsically ionic structure and low formation energy, which will hinder the future application. Herein, we design different anchoring groups (amino, sulfhydryl and thiocyanate) mediated nucleation and growth process for synthesis of Cs 2 ZrCl 6 crystals coated by SiO 2 nanospheres, achieving Cs 2 ZrCl 6 @SiO 2 -X (X = NH 2 , SH, SCN) composites, respectively. Among these three samples, Cs 2 ZrCl 6 @SiO 2 -SCN has an impressive photoluminescence quantum yield (PLQY) of 89 %. More importantly, it also manifests outstanding stability toward light illumination, heat and moisture. Such high PLQY and robust stability stem from the isolation effect due to tight anchoring, which separate perovskite crystals from each other and prevent particle aggregation. Finally, a large-area (113 cm 2 ) scintillation screen based on Cs 2 ZrCl 6 @SiO 2 -SCN@poly(dimethylsiloxane) (PDMS) and a commercial thin-film transistor (TFT) panel (16 cm × 13 cm, 125 μm pixel size) were used to fabricate an X-ray imaging detector, which showed a spatial resolution up to 4 lp mm −1 beyond the upper limit of TFT panel and high-quality imaging capability of static objects. It is believed that this scintillator screen has a potential application in next-generation indirect X-ray detection and imaging.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hao-Yu Zhou,Bai-Yu Feng,Zhen-bin Pang,Guo-Zhi Han
In this paper, using PVP-modified polystyrene microspheres as template, tetrabutyl titanate (TEOT), tetraethyl orthosilicate (TEOS) and melamine as precursor, we developed a facile one-pot two-step method to preparing a novel kind of mesoporous hollow SiO 2 @TiO 2 @g-C 3 N 4 ternary composite microspheres with plush surface, in which highly active black titanium dioxide (TiO 2 ) was formed by simple calcination without further chemical reduction treatment. The structure and morphology of the composite microspheres were detailed characterized for understanding the formation mechanism. Research results indicated that the hollow SiO 2 microspheres can promote the formation of oxygen vacancies in TiO 2 , and the ternary combination narrowed the bandgap width of the black hollow composite microspheres to 1.43 eV, thus endowing it with excellent broad-spectrum catalytic performance for rapid photo-degradation of persistent organic pollutants (POPs) such as dyes and antibiotics in water under sunlight. The removal rates of dyes reached more than 70 %, as well as that of antibiotics more than 50 % within one hour. Finally, a plausible catalytic degradation mechanism was discussed.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Wande Ding,Huiwei Zhuo,Mutai Bao,Yiming Li,Jinren Lu
In the past decades, application of nanomaterials in fabrication of organic-inorganic composite nanofiltration (NF) membrane for membrane performance improvement has been intensively studied. Herein, novel SiO 2 organic-inorganic NF membrane was achieved using an ultrathin and ordered stacking SiO 2 thin film as rejection layer assisted with layer-by-layer method. The resultant membrane showed a great enhancement in hydrophilicity with a membrane surface charge of −44 mV. It exhibited typical characteristics of negatively charged NF membranes because of the rejection against negatively charged methyl blue and methyl orange was 99.5% and 97.6%, while the rejection for positively charged methylene blue decreased to 90.1%. Correspondingly, the water flux declined from 20 L/m 2 ·h to 9.1 L/m 2 ·h using 20 ppm dye solutions as feed solution at 4 bar. In addition, the salt rejection of the produced membrane followed the sequence of MgSO 4 (88.7%) > Na 2 SO 4 (82.1%) > MgCl 2 (64.5%) > NaCl (43.1%), which was in accordance with the size exclusion and Donnan effect. The SiO 2 organic-inorganic membrane presented a remarkable stability under high operating pressure as well as long-term NF test. To conclude, this work paves a new avenue to fabricate highly permeable and selective NF membrane by using inorganic thin film as rejection layer.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuan Feng,Changfan Guo,Lin Gui,Li Liang,Feng Liao,Wanxia Huang,Kuanguo Li,Guanglei Cui,Zewen Zuo
Integrating metal nanoparticles with vanadium dioxide (VO2) is an effective means to realize active plasmonic regulation which has great application potential in optical devices that respond in real-time to external stimuli. However, the high temperature necessary for VO2 growth severely reshapes the metal nanoparticles, causing reduced refractive index (RI) sensitivity and degraded modulation performance. Herein, we construct a large-area dynamically tunable plasmonic system composed of a VO2-covered array of hexagonal gold nanoplates (AuNPLs). By introducing a SiO2 interface layer, the thermal tolerance of the AuNPLs is effectively improved, making the high RI sensitivity (∼368.3 nm/RIU at 855 nm) survive the subsequent VO2 deposition. Through tuning the localized surface plasmon resonance (LSPR) of the AuNPL array and the thickness of the VO2 film, the LSPR-related transmission dip can be tailored to the near-infrared region where VO2 shows a large two-phase RI contrast, a dip shift up to 272 nm is therefore realized upon VO2 phase transition. Furthermore, electro-optic modulation is demonstrated through electrically triggered VO2 partial phase transition which is accompanied by a gradually changed effective dielectric permittivity, and a continuous shift of the transmission dip from 1070 to 860 nm is achieved by varying the applied electrical current flowing through the film. This work provides a feasible route for controllably constructing stimuli-response optical devices with large wavelength modulation amplitude.
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