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Related Concept Videos

Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Precipitation Titration Curve: Analysis01:21

Precipitation Titration Curve: Analysis

2.0K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Masking and Demasking Agents01:19

Masking and Demasking Agents

3.9K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Related Experiment Video

Updated: Mar 18, 2026

Generation of Zerovalent Metal Core Nanoparticles Using n-2-aminoethyl-3-aminosilanetriol
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Silver ions eluted from partially protected silver nanoparticles.

Hamideh Heidari Zare1, Oliver Düttmann1, Attila Vass1

  • 1Laboratory for Surface Refinement and Thin Film Technology, Munich University of Applied Sciences, Munich D-80335, Bavaria, Germany.

Biointerphases
|July 13, 2016
PubMed
Summary
This summary is machine-generated.

New antibacterial urological catheters feature a silver-zebra stripe design. This controlled silver ion release, enhanced by urea, prolongs catheter use by effectively inhibiting bacteria in urine.

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Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Area of Science:

  • Biomaterials Engineering
  • Infectious Disease Research
  • Medical Device Development

Background:

  • Urological catheters are prone to bacterial infections, necessitating improved antimicrobial strategies.
  • Current antimicrobial coatings may have limitations in efficacy and duration of action.

Purpose of the Study:

  • To develop and evaluate a novel antibacterial urological catheter with a controlled silver ion release system.
  • To assess the efficacy of the silver-eluting catheter in inhibiting bacterial growth in simulated urine.

Main Methods:

  • Electroless plating of a silver film with a zebra-stripe pattern on the catheter's interior wall, capped with parylene.
  • Quantification of silver ion (Ag+) release rate using optical emission spectroscopy in artificial urine.
  • Determination of minimum inhibitory concentration (MIC) against specific bacterial strains using optical density measurements.

Main Results:

  • The silver-zebra stripe design effectively controlled Ag+ release in artificial urine.
  • Urea was found to be essential in chlorine-containing solutions (like urine) to prevent AgCl precipitation and maintain Ag+ antimicrobial activity.
  • The silver-eluting catheters met or exceeded the MIC, significantly prolonging their effective application period.

Conclusions:

  • The novel silver-zebra stripe catheter design offers a promising solution for reducing catheter-associated infections.
  • Controlled silver ion release, optimized by the presence of urea, enhances the longevity and efficacy of antibacterial urological catheters.