PHYSICS AND CHEMISTRY OF MINERALS
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2024
·Vol. 51
·期 2
·1-10
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IF 1.2
Yao Yao,Liu Xi,Du Xueyan,Zhang Lili,Yuan Hongsheng
Iron hydroxide FeO 2 H x ( x ≤ 1) and ferrous iron chloride FeCl 2 can adopt the HP-PdF 2 -type (space group: \(P{a_{\overline 3 }}\) , Z = 4) structure in the lowermost mantle, potentially contributing to the geochemical cycles of hydrogen and chlorine within Earth’s deep interior, respectively. Here we investigate the high-pressure behavior of HP-PdF 2 -type FeCl 2 by X-ray diffraction (XRD) and Raman measurements in laser-heated diamond anvil cells. Our results show that HP-PdF 2 -type FeCl 2 can be formed at 60‒67 GPa and 1650‒1850 K. Upon cold decompression, the diffraction peaks at pressures above 10 GPa can be indexed to the HP-PdF 2 -type structure. Intriguingly, the calculated cell volumes reveal a remarkable decrease of Δ V / V = ∼ 14% between 36 and 40 GPa, which is possibly caused by a pressure-induced spin transition of Fe 2+ (HS: high-spin → LS: low-spin). We also observe distinct changes in Raman spectra at 33‒35 GPa, practically coinciding with the onset pressures of isostructural phase transition in XRD results. Our observations combined with previous studies conducted at megabar pressures suggest that HP-PdF 2 -type FeCl 2 , with a wide pressure stability range, if present in subducting slabs, could facilitate the transport of chlorine from the middle lower mantle to the outer core.
研究领域:
地质学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Wenting Wu,Congcong Han,Qinhua Zhang,Qinggang Zhang,Zhongtao Li,David J. Gosztola,Gary P. Wiederrecht,Mingbo Wu
Carbon nitride as a metal-free conjugated polymer exhibits an intriguing prospect for the design of advanced photosensitizers for singlet oxygen ( 1 O 2 ) generation. However, the intersystem crossing (ISC) process is quite insufficient in carbon nitride, limiting the 1 O 2 generation. Here, we report a facile and general strategy to confined benzophenone as a heavy atom-free spin converter dopant in carbon nitride via the facile copolymerization . With proper energy level matching between the heavy atom-free spin converter and various ligands based on carbon nitride precursors, the proper combination can decrease the singlet-triplet energy gap (ΔE ST ) and hence generate 1 O 2 effectively. Due to its significant and selectivity for 1 O 2 generation, the as-prepared carbon nitride-based photosensitizer shows a high selective photooxidation activity for 1,5-dihydroxy-naphthalene (1,5-DHN). The product yield reached 71.8% after irradiation for 60 min, which was higher than that of cyclometalated Pt II complexes (53.6%) in homogeneous photooxidation. This study can broaden the application of carbon nitride in the field of selective heterogeneous photooxidation due to simple operation, low cost, and high efficiency, making it a strong candidate for future industrialization.
研究领域:
材料科学
·
光化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Hanjin Jiang,Yanan Guo,Zhiwen Zou,Le Zhao,Zhi Wang,Dong Wang,Xiaoyi Wang,Ling Zhang,Chaoquan Hu
Harvesting freshwater via solar interfacial evaporation is a promising strategy with net-zero emissions. To achieve long-term stable freshwater acquisition, researchers have developed dynamic solar-driven water evaporators. However, these evaporators exhibit limited evaporation rates due to the insufficient photothermal conversion properties of the materials used. In this study, we prepared Co 9 S 8 /CoNiO 2 /Au composite materials through in-situ topological transformation, thereby improving the effect of the heterogeneous crystal lattice mismatch on electron transport. By embedding these materials into a spherical polyurethane sponge, we developed a new type of self-rotating evaporator with a solar full-spectrum absorbance of 95.84 %. The evaporator stably exhibited an evaporation rate of 3.10 kg m −2 h −1 within 240 h in saturated brine. The present work provides insights into the preparation of photothermal composites and the development of high-efficiency stable solar evaporators.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xuan Wang,Lei Sun,Yu Shen,Jianhua Hou,Yan Sun,Bo Xiong,Feng Guo,Chunsheng Li,Weilong Shi
Self-cleaning solar-driven interfacial evaporation can mitigate reduced photothermal efficiency and evaporation rates due to salt accumulation, but traditional plastic spherical-based evaporators risk releasing microplastics during evaporation, posing environmental hazards. To overcome these challenges, this study developed a floating wood-based self-rotating evaporator system based on delignified wood spheres coated with polypyrrole (PPy/DWS), which utilizes naturally eco-friendly wood as the substrate, eliminating the risk of marine pollution, while its self-rotating mechanism effectively manages salt accumulation, ensuring sustained high-efficiency evaporation even in high-salinity environments. Experimental results demonstrated that the PPy/DWS evaporator achieved an optimal evaporation rate of 2.43 kg m −2 h −1 in 3.5 wt% saline solution under one sun irradiation, and maintained a rate of 1.52 kg m −2 h −1 even in a 20 wt% high-salinity solution, validating its efficiency and stability (> 8h) under various environmental conditions. This research provides critical technological support for clean water production and highlights the significant potential of the wood-based self-rotating system as a sustainable desalination and water purification solution.
研究领域:
材料科学
·
环境科学
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Materials Letters
·
2023
·
IF 11.4
Yumeng Ge,Zewen Su,Le Wang,Congcong Wang,Peiqing Cai,Shenghuang Lin,Yuan Liu,Shiqing Xu,Gongxun Bai
Solar interfacial water evaporation technology has shown great promise for seawater desalination and wastewater treatment. However, the deposition of salt crystals on the evaporator surface restrains the evaporation rate, which will affect further development of this technology. In this work, a spherical polystyrene foam was utilized as the material support, the surface of which was coated with photothermal materials for evaporator fabrication. The employing of well-prepared black Ti4O7 as a photothermal coating greatly improve the sunlight absorption of the surface, and the mixing of sodium alginate can achieve a hydrophilic effect. This unique coordination not only increases the evaporation rate of the spherical evaporator (2.46 kg m–2 h–1), but also performs well in water purification. The spherical design allows the evaporator to periodically clean the salt deposits on the evaporator surface through self-rotation, which provides a promising way to deal with the problem of salt deposition in evaporators in the future.
研究领域:
材料科学
·
环境工程
·
能源技术
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yijing Yang,Qianchen Rui,Xiao Yan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Rong Chen,Qiang Liao
Herein, we propose a novel optical strategy for stable water droplet trapping in an immiscible oil phase by using a 1550 nm focused laser beam. Distinct from conventional optical strategies, this approach leverages a local photothermal effect-induced flow field surrounding the water droplet in the oil phase to achieve stable droplet trapping without prolonged interaction between the laser and the water droplet, allowing for low-temperature operation. This feature effectively minimizes potential thermal damage risks and thereby preserves the viability of samples within the droplet, which is particularly promising for biological applications. By analyzing the force balance in vertical and horizontal directions, the trapping sites are predicted, and the results agree well with experimental data. Remarkably, the local photothermal effect-induced flow field imparts rotational momentum to the water droplet, enabling self-rotation of the trapped droplet, which enhances the internal mixing efficiency. This unique feature is demonstrated by the synthesis of gold nanoparticles and E. coli cultivation. This optical strategy allows for highly precise droplet manipulation, eliminating physical contact with solid surfaces, thereby avoiding contamination risks and ensuring lossless transfer. This work presents an innovative optical strategy for droplet trapping in an immiscible phase, holding promise for various applications.
研究领域:
光操控
·
微流控
·
生物光子学
·
纳米技术
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软物质物理
·
化学工程
·
生物应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）