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Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Protein Engineering by Yeast Surface Display
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Using an Engineered Galvanic Redox System to Generate Positive Surface Potentials that Promote Osteogenic Functions.

Yulong Zhang, Zhong Zheng, Mengliu Yu1

  • 1The Affiliated Hospital of Stomatology, College of Medicine , Zhejiang University , Hangzhou , Zhejiang 310006 , China.

ACS Applied Materials & Interfaces
|April 18, 2018
PubMed
Summary

This study engineered a novel implant coating using silver nanoparticles and stainless steel. The new material, SNPSA, exhibits both antimicrobial and bone-growth-promoting properties for better osseointegration.

Keywords:
galvanic reduction−oxidation reactionsosteogenesisstainless steel alloysurface potentialtitanium

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Orthopaedic Engineering

Background:

  • Osseointegration success hinges on balancing bone growth (osteogenesis) and bacterial contamination.
  • Previous efforts utilized silver nanoparticles (AgNPs) in poly(lactic-co-glycolic acid) (PLGA) coatings for antimicrobial effects.
  • Harnessing electrical forces for bone regeneration in implant materials remains a significant challenge.

Purpose of the Study:

  • To engineer a nanoscale galvanic redox system between AgNPs and 316L stainless steel alloy (316L-SA).
  • To investigate the surface properties and biological activity of the resulting AgNP/PLGA-coated 316L-SA (SNPSA) material.
  • To explore the potential of this novel material for enhanced osseointegration.

Main Methods:

  • Application of galvanic reduction-oxidation (redox) principles to create the SNPSA material.
  • Surface characterization using scanning electron microscopy, energy-dispersive X-ray spectroscopy, atomic force microscopy, Kelvin probe force microscopy, and contact angle measurement.
  • Evaluation of antimicrobial and osteogenic properties of the SNPSA material.

Main Results:

  • The SNPSA material exhibited significantly increased positive surface potential, hydrophilicity, surface fractional polarity, and surface electron accepting/donating index.
  • The SNPSA surface demonstrated both bactericidal properties and novel osteogenic bioactivity, promoting peri-implant bone growth.
  • This study successfully converted a detrimental galvanic redox reaction into a beneficial biological function on a biomedical metal.

Conclusions:

  • The development of SNPSA represents an innovative strategy for designing multifunctional biomaterials.
  • Controlled galvanic redox reactions offer a promising approach for creating advanced biomedical materials.
  • This technology has broad implications for material development and clinical applications in orthopaedics and dentistry.