Search

Your search keyword '"Wang, Quan ‐ Ming"' showing total 531 results
Start Over Author "Wang, Quan ‐ Ming"
531 results on '"Wang, Quan ‐ Ming"'

1. Effect of exhaust gas recirculation condensate on rubber properties

Author

WANG Quan-ming, CHEN Cui-cui, XU Ji-dong, GUO Ling-yan, FENG Hui, JIANG Li-yuan

Subjects
fluororubber, silicone rubber, ethylene-acrylate rubber, engine, exhaust gas recirculation system, mechanical property, thermal stability, Organic chemistry, QD241-441, Chemical engineering, TP155-156, Chemicals: Manufacture, use, etc., TP200-248
Abstract

A multi-component mixed acid was prepared by simulating the composition of exhaust gas recirculation condensate, and the effects of the multi-component mixed acid solution on the mechanical properties, apparent morphology and thermal stability of silicone rubber, fluororubber and ethylene-acrylate rubber were investigated. The results showed that after corrosion, the mechanical properties and surface morphology of fluororubber and ethylene-acrylate rubber remained good, while cracks appeared on the surface of silicone rubber and its tensile strength and elongation at break decreased significantly by 86.6% and 90.3%, respectively. Thermal stability of fluororubber remained good, while the initial decomposition temperature of ethylene-acrylate rubber and silicone rubber increased.

Published
2023
Full Text
View/download PDF

6. Heterometallic AuI6AgI6 Macrocyclic Cluster Templated by a Supramolecular Melamine Dimer.

Author

Pei, Xiao‐Li, Ma, Cheng, Guan, Zong‐Jie, Ni, Shao‐Fei, and Wang, Quan‐Ming

Abstract

The application of supramolecular templates in aligning atomically precise heterometal arrays is important for pursuing functional materials. Herein, we report that a bilayered supramolecular tri‐deprotonated melamine dimer functions as an effective template in the construction of a heterometallic gold(I)‐silver(I) macrocyclic cluster [μ6‐(C3N6H3)3−]2−AuI6AgI6. X‐ray single crystal structural analysis showed that a crown‐like AuI6AgI6 macrocycle is aligned around two parallelly stacked μ6‐(C3N6H3)3− moieties hold together with π–π interactions. Theoretical calculations revealed that the [μ6‐(C3N6H3)3−]2 motif dominantly contributes to the near‐occupied orbitals in the electronic structure, which is closely related to its luminescence properties. This work demonstrates that the supramolecular templates containing multiple symmetric binding sites may present a facile approach in the construction of functional metal clusters. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

13. Alkynyl‐Protected Bimetallic Nanoclusters with a Hybrid Mackay Icosahedral Ag42Cu12Cl Kernel and an Octahedral Ag22Cu12 Kernel.

Author

Hu, Feng, Guan, Zong‐Jie, Yuan, Shang‐Fu, and Wang, Quan‐Ming

Subjects
METAL chlorides, COPPER salts, REDUCING agents, MASS spectrometry, X-ray diffraction, COPPER chlorides, COPPER
Abstract

A facile strategy that directly reduces alkynyl‐silver precursors and copper salts for the synthesis of bimetallic nanoclusters using the weak reducing agent Ph2SiH2 is demonstrated. Two alkynyl‐protected concentric‐shell nanoclusters, (Ph4P)2[Ag22Cu12(C≡CR)28] and (Ph4P)3[Ag42Cu12Cl(C≡CR)36] (Ag22Cu12 and Ag42Cu12Cl, R=bis(trifluoromethyl)phenyl), were successfully obtained and characterized by single‐crystal X‐ray diffraction and electro‐spray ionization mass spectrometry. For the first time, a hybrid 55‐atom two‐shell Mackay icosahedron was found in Ag42Cu12Cl, which is icosahedral M54Cl instead of M55. The incorporation of a chloride in the metal icosahedron contributes to the stability of the cluster from both electronic and geometric aspects. Alkynyl ligands show various binding‐modes including linear "RC≡C−Cu−C≡CR" staple motifs. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

15. Disc‐Like Silver Nanocluster Ag93 Built with Bicapped Hexagonal Prismatic Ag15 and Ino Decahedral Ag13 Units.

Author

Hu, Feng, He, Rui‐Lin, Guan, Zong‐Jie, Liu, Chun‐Yu, and Wang, Quan‐Ming

Subjects
METAL clusters, SILVER, METALS
Abstract

The reduction of alkynyl‐silver and phosphine‐silver precursors with a weak reducing reagent Ph2SiH2 led to the formation of a novel silver nanocluster [Ag93(PPh3)6(C≡CR)50]3+ (R=4‐CH3OC6H4), which is the largest structurally characterized cluster of clusters. This disc‐shaped cluster has a Ag69 kernel consisting of a bicapped hexagonal prismatic Ag15 unit wrapped by six Ino decahedra through edge‐sharing. This is the first time that Ino decahedra are used as a building block to assemble a cluster of clusters. Moreover, the central silver atom has a coordination number of 14, which is the highest in metal nanoclusters. This work provides a diverse metal packing pattern in metal nanoclusters, which is helpful for understanding metal cluster assembling mechanisms. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results