Precision Chemistry最新文献

Precision Chemistry Pub Date : 2025-04-17 DOI: 10.1021/prechem.5c0003910.1021/prechem.5c00039

Juanjuan Jia*,

引用次数: 0

Precision Chemistry Pub Date : 2025-04-17 eCollection Date: 2025-05-26 DOI: 10.1021/prechem.5c00039

Juanjuan Jia

引用次数: 0

Rational Synthesis of Uniform Au Nanospheres under One-Shot Injection: From Mechanistic Understanding to Experimental Control. 一次注射法制备均匀金纳米球：从机理认识到实验控制。

Precision Chemistry Pub Date : 2025-03-29 eCollection Date: 2025-05-26 DOI: 10.1021/prechem.4c00105

Kei Kwan Li, Jianlong He, Qijia Huang, Seth Kinoshita, Yong Ding, Younan Xia

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引用次数: 0

Rational Synthesis of Uniform Au Nanospheres under One-Shot Injection: From Mechanistic Understanding to Experimental Control 一次注射法制备均匀金纳米球：从机理认识到实验控制

Precision Chemistry Pub Date : 2025-03-29 DOI: 10.1021/prechem.4c0010510.1021/prechem.4c00105

Kei Kwan Li, Jianlong He, Qijia Huang, Seth Kinoshita, Yong Ding and Younan Xia*,

{"title":"Rational Synthesis of Uniform Au Nanospheres under One-Shot Injection: From Mechanistic Understanding to Experimental Control","authors":"Kei Kwan Li, Jianlong He, Qijia Huang, Seth Kinoshita, Yong Ding and Younan Xia*, ","doi":"10.1021/prechem.4c0010510.1021/prechem.4c00105","DOIUrl":"https://doi.org/10.1021/prechem.4c00105https://doi.org/10.1021/prechem.4c00105","url":null,"abstract":"Gold nanospheres with uniform sizes greater than 30 nm are essential to quantitative lateral flow immunoassays for the rapid detection of pathogens such as viruses, bacteria, and fungi. However, scaling up their synthesis for commercial applications remains challenging due to the necessity to introduce the precursor dropwise. Herein, we report the synthesis of Au cubes with an edge length of 30 nm using one-shot injection of the precursor, followed by aging to transform the cubes into uniform spheres of 35 nm in diameter. Our mechanistic study based on qualitative and quantitative analyses using surface-enhanced Raman scattering and inductively coupled plasma mass spectrometry, respectively, suggests that Br– desorption from the surface of Au nanocubes at an elevated temperature was responsible for the shape transformation by inducing oxidative etching and atomic migration in the outermost layer. By eliminating the need for dropwise addition, this protocol is well-suited for the mass production of Au nanospheres in a continuous flow reactor for future incorporation into quantitative point-of-care sensors.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 5","pages":"272–278 272–278"},"PeriodicalIF":0.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.4c00105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144133910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the Cold-Start Performance of Proton Exchange Membrane Fuel Cells via Precision Engineering of Key Materials. 关键材料精细化工程提高质子交换膜燃料电池冷启动性能。

Precision Chemistry Pub Date : 2025-03-14 eCollection Date: 2025-04-28 DOI: 10.1021/prechem.4c00079

Zhiyuan Ge, Shuying Xu, Xiaoyang Fu, Zipeng Zhao

{"title":"Improving the Cold-Start Performance of Proton Exchange Membrane Fuel Cells via Precision Engineering of Key Materials.","authors":"Zhiyuan Ge, Shuying Xu, Xiaoyang Fu, Zipeng Zhao","doi":"10.1021/prechem.4c00079","DOIUrl":"https://doi.org/10.1021/prechem.4c00079","url":null,"abstract":"Proton exchange membrane fuel cells (PEMFCs) have emerged as important zero-emission power sources due to their efficiency and eco-friendly characteristics. A critical feature required for their widespread adoption is the performance of low-temperature cold start. However, at subzero degrees Celsius, the freezing of the produced water can hinder or even lead to failure of the fuel cell start-up process. To successfully achieve a cold start under such conditions, the PEMFC must rapidly and reliably transition from a fully cooled state to a stable operating condition. Various improvements have been focused on the system engineering aspect to address this challenge, yet many of these methods come with their drawbacks. This paper reviews the recent progress of the PEMFC cold start from the perspective of key materials engineering. It provides a detailed summary of how the proton exchange membrane (PEM), catalyst layer, microporous layer (MPL), and gas diffusion layer (GDL) affect the cold-start performance. Further analysis reveals that the fundamental mechanisms of improving cold-start performance can be summarized into three aspects: increasing the ratio of water bound in the ionomer, hindering the transformation process from supercooled water to ice, improving the removal of supercooled water, or ensuring it is transported to the outside of the membrane electrode assembly (MEA) before it gets frozen. By precisely regulating these key components, it is possible to develop a simple and energy-efficient solution for improving the cold start performance of the PEMFC.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 4","pages":"172-186"},"PeriodicalIF":0.0,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12042135/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144049844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the Cold-Start Performance of Proton Exchange Membrane Fuel Cells via Precision Engineering of Key Materials 关键材料精细化工程提高质子交换膜燃料电池冷启动性能

Precision Chemistry Pub Date : 2025-03-14 DOI: 10.1021/prechem.4c0007910.1021/prechem.4c00079

Zhiyuan Ge, Shuying Xu, Xiaoyang Fu* and Zipeng Zhao*,

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引用次数: 0

Correction to "Stepwise Chemical Reduction of [4]Cyclo[4]helicenylene: Stereo Transformation and Site-Selective Metal Complexation". 对“[4]环[4]螺旋炔的逐步化学还原：立体转化和选择性金属络合”的修正。

Precision Chemistry Pub Date : 2025-03-13 eCollection Date: 2025-04-28 DOI: 10.1021/prechem.5c00027

Zheng Zhou, Yong Yang, Jianwei Liang, Sota Sato, Zhenyi Zhang, Zheng Wei

引用次数: 0

Synthesis of Alternatively-Twisted Nanographenes by Semi-Deprotection-Induced Cyclization 半脱保护诱导环化法合成交替扭曲纳米石墨烯

Precision Chemistry Pub Date : 2025-03-13 DOI: 10.1021/prechem.5c0000110.1021/prechem.5c00001

Zhenxun Xu, Suriguga Meng, Zhiyu Zhang, Shuqin Han*, Fenghua Bai*, Yanping Dong, Yoshifumi Hashikawa* and Chaolumen*,

{"title":"Synthesis of Alternatively-Twisted Nanographenes by Semi-Deprotection-Induced Cyclization","authors":"Zhenxun Xu, Suriguga Meng, Zhiyu Zhang, Shuqin Han*, Fenghua Bai*, Yanping Dong, Yoshifumi Hashikawa* and Chaolumen*, ","doi":"10.1021/prechem.5c0000110.1021/prechem.5c00001","DOIUrl":"https://doi.org/10.1021/prechem.5c00001https://doi.org/10.1021/prechem.5c00001","url":null,"abstract":"Twisted nanographenes (NGs) are currently attracting a lot of attention owing to their geometrical and electronic structures that differ substantively from conventional planar and nonplanar NGs, while the strategic synthesis of twisted NGs is still a topic of interest because the products are often interconvertible among unidirectionally, alternatively, or randomly twisted geometries and otherwise obtained as a mixture of them. Herein, we report the conformationally specific synthesis of twisted NGs where the geometry was reinforced by introducing 1,4-dioxane rings at a K-region of a central pyrene core that bears a large contortion. The 1,4-dioxane rings were generated by semi-deprotection, of tetraoxa[4.4.4]propellanes in precursor molecules, which were confirmed to be engaged in forming C–C bonds via a Friedel–Crafts type mechanism. The large contortion within the pyrene core causes a narrowed HOMO–LUMO gap on account of unusual pz-lobe overlap between +z and −z sides, giving rise to red emission with a high quantum yield of 94% as well as stable redox processes of 2e– uptake/release.","PeriodicalId":29793,"journal":{"name":"Precision Chemistry","volume":"3 5","pages":"289–294 289–294"},"PeriodicalIF":0.0,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/prechem.5c00001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144133897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to “Stepwise Chemical Reduction of [4]Cyclo[4]helicenylene: Stereo Transformation and Site-Selective Metal Complexation” 对“[4]环[4]螺旋炔的逐步化学还原：立体转化和选择性金属络合”的修正

Precision Chemistry Pub Date : 2025-03-13 DOI: 10.1021/prechem.5c0002710.1021/prechem.5c00027

Zheng Zhou*, Yong Yang*, Jianwei Liang, Sota Sato, Zhenyi Zhang and Zheng Wei,

引用次数: 0

Synthesis of Alternatively-Twisted Nanographenes by Semi-Deprotection-Induced Cyclization. 半脱保护诱导环化法合成交替扭曲纳米石墨烯。

Precision Chemistry Pub Date : 2025-03-13 eCollection Date: 2025-05-26 DOI: 10.1021/prechem.5c00001

Zhenxun Xu, Suriguga Meng, Zhiyu Zhang, Shuqin Han, Fenghua Bai, Yanping Dong, Yoshifumi Hashikawa, Chaolumen

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引用次数: 0