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Related Concept Videos

Calculating pH Changes in a Buffer Solution02:45

Calculating pH Changes in a Buffer Solution

57.9K
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
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Buffers02:56

Buffers

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A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

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Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak...
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Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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Standard Electrode Potentials03:02

Standard Electrode Potentials

50.0K
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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Fabrication of Robust Nanoscale Contact between a Silver Nanowire Electrode and CdS Buffer Layer in CuIn,GaSe2 Thin-film Solar Cells
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Solution Processable, Flexible, and Transparent Hybrid Electrodes Using Tungsten Oxide Buffer Layer on Silver

Sun-Gyu Jung1, Yong Sub Shim1, Cheol Hwee Park1

  • 1Display and Nanosystem Laboratory, School of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.

Journal of Nanoscience and Nanotechnology
|April 28, 2019
PubMed
Summary

Researchers developed flexible, transparent hybrid electrodes using tungsten trioxide (WO3) on silver nanowires. This cost-effective, scalable method offers a promising alternative for flexible electronic devices.

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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics Engineering

Background:

  • Conventional indium tin oxide electrodes face limitations in flexibility and cost for emerging electronic applications.
  • The demand for flexible, transparent, and conductive materials is increasing for wearable and foldable devices.

Purpose of the Study:

  • To fabricate and characterize novel hybrid electrodes with enhanced flexibility, transparency, and conductivity.
  • To explore the potential of tungsten trioxide (WO3) as a buffer layer on silver nanowires for improved electrode performance.
  • To establish a cost-effective and scalable fabrication method for these advanced electrodes.

Main Methods:

  • Solution-based deposition of a tungsten trioxide (WO3) buffer layer onto silver nanowire networks.
  • Fabrication of hybrid electrodes directly on flexible substrates at low temperatures.
  • Characterization of electrode properties including flexibility, transparency, conductivity, and surface roughness.

Main Results:

  • Successfully fabricated solution-processable, flexible, and transparent hybrid electrodes.
  • Demonstrated high conductivity, transparency, and flexibility in the developed electrodes.
  • Showcased the ability to tailor electrode properties by controlling the WO3 buffer layer thickness.

Conclusions:

  • The fabricated hybrid electrodes present a viable, cost-effective, and scalable alternative to traditional indium tin oxide electrodes.
  • These electrodes are well-suited for applications in flexible electronic devices due to their tunable and superior properties.
  • The WO3 buffer layer plays a crucial role in optimizing the performance of silver nanowire-based flexible electrodes.