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Weak Base Solutions

Weak Base Solutions

Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...

Weak Acid Solutions

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...

Conductors and Insulators

Conductors and Insulators

Some materials may easily let electrical charges pass through them, while others obstruct their flow. The former are called conductors and the latter insulators. The atomic structures of materials determine whether they are conductors or insulators of electricity.
Most metals are conductors. Their atomic configuration is such that one or more electron(s) are loosely bound to the nucleus in each atom. Thus, a sea of mobile electrons are available in them, known as free electrons. Their easy...

Insulation Coordination

Insulation Coordination

Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...

Titration of a Weak Acid with a Weak Base

Titration of a Weak Acid with a Weak Base

Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...

Titration Calculations: Weak Acid - Strong Base

Titration Calculations: Weak Acid - Strong Base

Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:

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Related Experiment Video

Updated: Feb 5, 2026

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

Weak-link Josephson Junctions Made from Topological Crystalline Insulators.

R A Snyder¹, C J Trimble¹, C C Rong²

¹Department of Physics, Joint Quantum Institute and the Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, USA.

Physical Review Letters

|September 20, 2018

Summary

Topological crystalline insulators like Pb_{0.5}Sn_{0.5}Te enable novel Josephson junctions. These junctions show unique ac Josephson effect properties, unlike those made with trivial materials, indicating new topological phenomena.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Phenomena

Background:

Josephson junctions are crucial for quantum electronics.
Topological crystalline insulators (TCIs) offer unique electronic properties due to their surface states.
Understanding TCI behavior in superconducting devices is an active research area.

Purpose of the Study:

To fabricate and characterize Josephson junctions using a TCI, Pb_{0.5}Sn_{0.5}Te, as the weak link.
To compare the properties of these TCI-based junctions with those using a topologically trivial material, PbTe.
To investigate the influence of topological surface states on the Josephson effect.

Main Methods:

Fabrication of Josephson junctions with Pb_{0.5}Sn_{0.5}Te and PbTe weak links.
Characterization of junction properties, focusing on the ac Josephson effect.
Analysis of the current-phase relation and subharmonic structures.

Main Results:

Josephson junctions fabricated with Pb_{0.5}Sn_{0.5}Te exhibited a distinct subharmonic structure in the ac Josephson effect.
This subharmonic structure is consistent with a skewed current-phase relation.
Junctions made with the topologically trivial PbTe did not display this subharmonic structure.

Conclusions:

The observed subharmonic structure in TCI-based Josephson junctions is a signature of novel physics.
This phenomenon is attributed to the topologically nontrivial surface states of Pb_{0.5}Sn_{0.5}Te.
These findings suggest potential for new quantum phenomena and applications using topological materials.