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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

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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...
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Polyprotic Acids03:38

Polyprotic Acids

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Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
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Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
10.1K
Solvating Effects02:12

Solvating Effects

9.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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Composition of Polyprotic Acid Solutions as a Function of pH01:19

Composition of Polyprotic Acid Solutions as a Function of pH

1.1K
Polyprotic acids of the type H2M constitute two ionizable protons. As a result, on titration with a base, they exhibit two equivalence points in the titration curve. During titration, the species H2M, HM−, and M2− will be present in the solution at different points. The fractions of H2M, HM−, and M2− present at the various instances of the titration are denoted by α0, α1, and α2, respectively.
A graph with the alpha values is plotted against the volume of...
1.1K
Titration of Polyprotic Acids with a Strong Base01:23

Titration of Polyprotic Acids with a Strong Base

3.3K
Titration of a polyprotic acid, which contains multiple ionizable protons, involves distinct dissociation steps, each with its own dissociation constant (Ka). Each successive Ka is weaker than the previous one. In the titration of a polyprotic acid like sulfurous acid with a strong base such as sodium hydroxide, the base first neutralizes the initial ionizable proton, forming an intermediate species (e.g., hydrogen sulfite ions). This step's titration curve resembles that of a weak...
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Durable Near-Zero Wear Behavior Achieved by Polymer-Based Protic Ionic Liquids on Engineering Steel Surfaces.

Huanchen Liu1, Lehao Zhao1, Xiaoyu Wang1

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

ACS Applied Materials & Interfaces
|September 5, 2025
PubMed
Summary

A novel polymer-based proton ionic liquid (PPILs) lubricant achieves near-zero wear on steel surfaces. This breakthrough extends equipment life under demanding conditions, offering a durable solution for tribological challenges.

Keywords:
elasto-hydrodynamic lubricationengineering steelmacroscale superlubricitynear-zero wearpolymer-based protic ionic liquids

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Area of Science:

  • Materials Science
  • Tribology
  • Surface Engineering

Background:

  • Engineering steel surfaces experience significant wear, limiting mechanical equipment lifespan.
  • Existing low-wear strategies are often condition-specific and lack broad applicability.
  • Developing advanced lubricants is crucial for enhancing material durability and performance.

Purpose of the Study:

  • To design and evaluate a novel polymer-based proton ionic liquid (PPILs) lubricant for achieving near-zero wear on engineering steel.
  • To investigate the tribological performance of PPILs under high contact pressures and demanding environmental conditions.
  • To explore the potential of PPILs in superlubrication systems for advanced material applications.

Main Methods:

  • Synthesis of polymer-based proton ionic liquids (PPILs) via proton exchange between polyethylenimine and bis(2-ethylhexyl) phosphate.
  • Tribological testing of PPILs on steel surfaces under high Hertzian contact pressures (2.15 GPa).
  • Evaluation of lubricant performance under long-term friction and high-frequency conditions.
  • Development of a superlubrication system by combining PPILs with polyol aqueous solutions for Si3N4/glass friction pairs.

Main Results:

  • PPILs demonstrated a friction coefficient of ~0.08 and an exceptionally low wear rate (1.46 × 10^-10 mm³·N⁻¹·m⁻¹) on steel under high pressure.
  • Durable near-zero wear behavior was maintained even under prolonged friction and high-frequency testing.
  • A superlubrication system (friction coefficient μ = 0.007) was achieved with an ultrashort running-in period (<3 s) using PPILs and polyol solutions.
  • The near-zero wear is attributed to synergistic effects of adsorption films, tribochemical films, and hydrodynamic lubrication.

Conclusions:

  • The developed PPILs represent a new class of lubricants offering superior wear resistance for engineering steel.
  • This study overcomes limitations in achieving ultralow wear, expanding the application scope of advanced lubrication materials.
  • The findings contribute to the field of superlubrication by introducing effective PPIL-based systems with rapid performance.