排序方式: 共有57条查询结果,搜索用时 15 毫秒
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Catalytic oxidation of alkanethiols and dialkyldisulfides to alkanesulfonic acids by H2O2/CH3ReO3 examined by electrospray ionization mass spectrometry
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Amrit Kumar Dr. David G. Madden Dr. Matteo Lusi Dr. Kai‐Jie Chen Emma A. Daniels Dr. Teresa Curtin Dr. John J. Perry IV Prof. Dr. Michael J. Zaworotko 《Angewandte Chemie (International ed. in English)》2015,54(48):14372-14377
Sequestration of CO2, either from gas mixtures or directly from air (direct air capture, DAC), could mitigate carbon emissions. Here five materials are investigated for their ability to adsorb CO2 directly from air and other gas mixtures. The sorbents studied are benchmark materials that encompass four types of porous material, one chemisorbent, TEPA‐SBA‐15 (amine‐modified mesoporous silica) and four physisorbents: Zeolite 13X (inorganic); HKUST‐1 and Mg‐MOF‐74/Mg‐dobdc (metal–organic frameworks, MOFs); SIFSIX‐3‐Ni , (hybrid ultramicroporous material). Temperature‐programmed desorption (TPD) experiments afforded information about the contents of each sorbent under equilibrium conditions and their ease of recycling. Accelerated stability tests addressed projected shelf‐life of the five sorbents. The four physisorbents were found to be capable of carbon capture from CO2‐rich gas mixtures, but competition and reaction with atmospheric moisture significantly reduced their DAC performance. 相似文献
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Reversible Switching between Highly Porous and Nonporous Phases of an Interpenetrated Diamondoid Coordination Network That Exhibits Gate‐Opening at Methane Storage Pressures
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Dr. Qing‐Yuan Yang Dr. Prem Lama Dr. Susan Sen Dr. Matteo Lusi Dr. Kai‐Jie Chen Dr. Wen‐Yang Gao Mohana Shivanna Dr. Tony Pham Dr. Nobuhiko Hosono Dr. Shinpei Kusaka Dr. John J. Perry IV Prof. Dr. Shengqian Ma Prof. Dr. Brian Space Prof. Dr. Leonard J. Barbour Prof. Dr. Susumu Kitagawa Prof. Dr. Michael J. Zaworotko 《Angewandte Chemie (International ed. in English)》2018,57(20):5684-5689
Herein, we report that a new flexible coordination network, NiL2 (L=4‐(4‐pyridyl)‐biphenyl‐4‐carboxylic acid), with diamondoid topology switches between non‐porous (closed) and several porous (open) phases at specific CO2 and CH4 pressures. These phases are manifested by multi‐step low‐pressure isotherms for CO2 or a single‐step high‐pressure isotherm for CH4. The potential methane working capacity of NiL2 approaches that of compressed natural gas but at much lower pressures. The guest‐induced phase transitions of NiL2 were studied by single‐crystal XRD, in situ variable pressure powder XRD, synchrotron powder XRD, pressure‐gradient differential scanning calorimetry (P‐DSC), and molecular modeling. The detailed structural information provides insight into the extreme flexibility of NiL2 . Specifically, the extended linker ligand, L , undergoes ligand contortion and interactions between interpenetrated networks or sorbate–sorbent interactions enable the observed switching. 相似文献
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Dr. Joseph J. Armao IV Prof. Dr. Jean‐Marie Lehn 《Angewandte Chemie (International ed. in English)》2016,55(43):13450-13454
Non‐volatile solutes in an evaporating drop experience an out‐of‐equilibrium state due to non‐linear concentration effects and complex flow patterns. Here, we demonstrate a small molecule chemical reaction network that undergoes a rapid adaptation response to the out‐of‐equilibrium conditions inside the droplet leading to control over the molecular constitution and spatial arrangement of the deposition pattern. Adaptation results in a pronounced coffee stain effect and coupling to chemical concentration gradients within the drop is demonstrated. Amplification and suppression of network species are readily identifiable with confocal fluorescence microscopy. We anticipate that these observations will contribute to the design and exploration of out‐of‐equilibrium chemical systems, as well as be useful towards the development of point‐of‐care medical diagnostics and controlled deposition of small molecules through inkjet printing. 相似文献
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利用上下解方法研究了Banach空间中一类四阶奇异两点边值问题的解的存在性. 相似文献