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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
Tonicity in Animals00:59

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...

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Thixotropy.

Jan Mewis1, Norman J Wagner

  • 1Department of Chemical Engineering, K.U.Leuven, de Croylaan 46, 3001, Belgium.

Advances in Colloid and Interface Science
|November 18, 2008
PubMed
Summary
This summary is machine-generated.

Flow-induced structural changes in colloidal systems, known as thixotropy, cause variable viscosity. This review covers thixotropy

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Area of Science:

  • Colloid and Surface Science
  • Rheology
  • Materials Science

Background:

  • Flow can induce structural changes in colloidal dispersions, affecting their properties.
  • Understanding these flow-induced changes, particularly thixotropy, is crucial in colloid science.
  • Thixotropy, a time-dependent reversible change in viscosity, is a complex phenomenon in flowing systems.

Purpose of the Study:

  • To review the fundamental concepts of thixotropy.
  • To illustrate the widespread occurrence of thixotropy in various colloidal systems.
  • To evaluate existing models for thixotropic suspension rheology.

Main Methods:

  • Review of fundamental concepts and definitions of thixotropy.
  • Examination of the relationship between thixotropy and nonlinear viscoelasticity.
  • Categorization and evaluation of existing rheological models for thixotropic suspensions.

Main Results:

  • Thixotropy is a common rheological property across diverse natural and manmade colloidal systems.
  • Flow-induced microstructural changes are complex and not fully understood.
  • Various rheological manifestations and measurement procedures for thixotropy exist.

Conclusions:

  • Thixotropy is a ubiquitous phenomenon in colloidal systems, characterized by reversible, time-dependent viscosity changes.
  • Further research is needed to fully elucidate the complex microstructural changes associated with flow.
  • Existing models for thixotropic rheology require continued evaluation and refinement.