Liesegang rings of silver chromate

1953 ◽  
Vol 133 (1) ◽  
pp. 34-37 ◽  
Author(s):  
K. K. Varma ◽  
S. Ghosh
Keyword(s):  
Liesegang Rings ◽  
Silver Chromate

Liesegang rings of silver chromate

1953 ◽  
Vol 133 (1) ◽  
pp. 32-34 ◽  
Author(s):  
K. K. Varma ◽  
S. Ghosh
Keyword(s):  
Liesegang Rings ◽  
Silver Chromate

Elemental iron: reduction of pertechnetate in the presence of silica and periodicity of precipitated nano-structures

2021 ◽  
Author(s):  
Daria Boglaienko ◽  
Odeta Qafoku ◽  
Ravi K. Kukkadapu ◽  
Libor Kovarik ◽  
Yelena P. Katsenovich ◽  
...  
Keyword(s):  
Iron Reduction ◽  
Layered Structures ◽  
Elemental Iron ◽  
Liesegang Rings ◽  
Dissolved Iron ◽  
Nano Structures

Enhanced TcO4− reduction by metallic Fe0 in the presence of particulate and structural Si. Rhythmical precipitation of dissolved iron leads to formation of layered structures related to geological phenomena such as orbicular rocks and Liesegang rings.

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

CrystEngComm ◽  
2014 ◽  
Vol 16 (29) ◽  
pp. 6542-6546 ◽  
Author(s):  
Qian Zhao ◽  
Jing Li ◽  
Shiyi Tang ◽  
Yongzhi Zhang ◽  
Li Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Crystal Structure ◽  
External Magnetic Field ◽  
Liesegang Rings

An external magnetic field can control the chirality of Liesegang rings and induce a change in the silver crystal structure.

scholarly journals Characterization and Analysis of the Carbonation Process of a Lime Mortar Obtained from Phosphogypsum Waste

2021 ◽  
Vol 18 (12) ◽  
pp. 6664
Author(s):  
María Isabel Romero-Hermida ◽  
Antonio María Borrero-López ◽  
Vicente Flores-Alés ◽  
Francisco Javier Alejandre ◽  
José María Franco ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mineralogical Composition ◽  
Barium Sulphate ◽  
Negative Influence ◽  
Raw Material ◽  
Porous System ◽  
Waste Products ◽  
Liesegang Rings ◽  
Carbonation Process ◽  
Ultrasonic Propagation

This work addresses the reuse of waste products as a raw material for lime putties, which are one of the components of mortar. 1:3 Lime/sand mortars very similar to conventional construction mortars were prepared using a lime putty obtained from the treatment of phosphogypsum with sodium hydroxide. The physical, rheological and mechanical properties of this phosphogypsum-derived mortar have been studied, as well as the mineralogical composition, microstructure by scanning electron microscope (SEM) and curing process by monitoring carbonation and ultrasonic propagation velocity. Considering the negative influence of sulphates on the hardened material, the behaviour of the material after sulphates precipitation by adding barium sulphate was additionally tested. Carbonation progressed from the outside to the inside of the specimen through the porous system by Liesegang rings patterns for mortars with soluble sulphates, while the carbonation with precipitated sulphates was controlled by diffusion-precipitation. Overall, the negative influence of low-sulphate contents on the mechanical properties of mortars was verified. It must be highlighted the importance of their precipitation to obtain adequate performance.

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