Liesegang rings of dendritic silver crystals emerging from galvanic displacement reaction in a liquid-phase solution

Xie, Shunping; Zhang, Xicui; Shen, Yang; Paau, Man Chin; Xiao, Dan; Choi, Martin M.F.

doi:10.1039/c2ra20055d

Cited by 18 publications

(12 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduction potential of silver ion (Ag + + e À / Ag (s), standard reduction potential E 0 ¼ +0.800 V) is lower than those of AuCl 4À and Pt 2+ , but higher than those of most transition metals. For example, Ag dendrites with various shapes were obtained by galvanic displacement with Zn plate, 32 and electroless deposition produces metallic silver films by galvanic displacement with copper. 33 From Ag NPs dispersed in aqueous medium, galvanic displacement with Pt and Au was carried out at 75 C in the oven without stirring.…”

Section: Resultsmentioning

confidence: 99%

Hollow Au@Pd and Au@Pt core–shell nanoparticles as electrocatalysts for ethanol oxidation reactions

et al. 2012

View full text Add to dashboard Cite

Hybrid alloys among gold, palladium and platinum become a new category of catalysts primarily due to their enhanced catalytic effects. Enhancement means not only their effectiveness, but also their uniqueness as catalysts for the reactions that individual metals may not catalyze. Here, preparation of hollow Au@Pd and Au@Pt core-shell nanoparticles (NPs) and their use as electrocatalysts are reported. Galvanic displacement with Ag NPs is used to obtain hollow NPs, and higher reduction potential of Au compared to Ag, Pd, and Pt helps to produce hollow Au cores first, followed by Pd or Pt shell growth. Continuous and highly crystalline shell growth was observed in Au@Pd core-shell NPs, but the sporadic and porous-like structure was observed in Au@Pt core-shell NPs. Along with hollow core-shell NPs, hollow porous Pt and hollow Au NPs are also prepared from Ag seed NPs. Twin boundaries which are typically observed in large size (>20 nm) Au NPs were not observed in hollow Au NPs. This absence is believed to be due to the role of the hollows, which significantly reduce the strain energy of edges where the two lattice planes meet. In ethanol oxidation reactions in alkaline medium, hollow Au@Pd core-shell NPs show highest current density in forward scan. Hollow Au@Pt core-shell NPs maintain better catalytic activities than metallic Pt, which is thought to be due to the better crystallinity of Pt shells as well as the alloy effect of Au cores.

show abstract

Section: Resultsmentioning

confidence: 99%

Hollow Au@Pd and Au@Pt core–shell nanoparticles as electrocatalysts for ethanol oxidation reactions

et al. 2012

View full text Add to dashboard Cite

show abstract

“…It is interesting to explore the effect of a magnetic field on nonmagnetic materials. Xie et al 21 made a 2D LR consisting of non-magnetic Ag dendrite crystals and zinc (Zn) plates, which were grown in a Ag 2 SO 4 aqueous solution via a simple galvanic displacement reaction. It provided the possibility of observing the independent effect of a magnetic field on the self-assembly of Ag dendrite crystals.…”

mentioning

confidence: 99%

Magnetic-field-induced growth of silver dendrite-crystalline Liesegang rings

Zhao

Tang

et al. 2014

CrystEngComm

Self Cite

View full text Add to dashboard Cite

show abstract

“…Assignments of chemical structure to temperature-dependent Raman vibrational modes agree with previously reported Raman frequencies observed at a constant temperature (Table I). 9,20–36…”

Section: Resultsmentioning

confidence: 99%

Continuous Temperature-Dependent Raman Spectroscopy of Melamine and Structural Analog Detection in Milk Powder

et al. 2015

View full text Add to dashboard Cite

Hyperspectral Raman imaging has the potential for rapid screening of solid-phase samples for potential adulterants. We can improve mixture analysis algorithms by defining a temperature range in which the contaminant spectrum changes dramatically and uniquely compared with unadulterated material. Raman spectra were acquired for urea, biuret, cyanuric acid, and melamine (pure and at 1% in dried milk powder) from 50 to 310 °C with a gradient of 1 °C min(-1). Adulterants were clearly indentified in the milk powder. Specific frequencies that were mainly associated with ring breathing, stretching, and in-plane deformation shifted with respect to temperature up to 12 cm(-1) in all four molecules. Specific frequencies significantly increased/decreased in intensity within narrow temperature ranges independent of whether the amine was mixed in milk. Correlation of Raman and differential scanning calorimetry data identified structural components and vibrational modes, which concur with or trigger phase transitions.

show abstract

Liesegang rings of dendritic silver crystals emerging from galvanic displacement reaction in a liquid-phase solution

Cited by 18 publications

References 49 publications

Hollow Au@Pd and Au@Pt core–shell nanoparticles as electrocatalysts for ethanol oxidation reactions

Hollow Au@Pd and Au@Pt core–shell nanoparticles as electrocatalysts for ethanol oxidation reactions

Magnetic-field-induced growth of silver dendrite-crystalline Liesegang rings

Continuous Temperature-Dependent Raman Spectroscopy of Melamine and Structural Analog Detection in Milk Powder

Contact Info

Product

Resources

About