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Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
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The Leveling Effect of a Solvent
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
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Quality of Water

In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...

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Alginate-Based Hydrogels: Recent Progress in Preparation, Property Tuning, and Multifunctional Applications.

Xiaoxu Liang1, Shiji Chen2, Yuxiong Liang3

  • 1School of Arts and Sciences, Guangzhou Maritime University, Guangzhou 510725, China.

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Summary
This summary is machine-generated.

Alginate hydrogels from seaweed offer tunable properties for diverse applications. Modifications enhance strength and bioactivity, advancing fields from medicine to electronics, though challenges remain for widespread use.

Keywords:
alginatebiomedical applicationsfabricationfood industryhydrogelsmultifunctional materialswastewater remediation

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Area of Science:

  • Materials Science and Biomaterials Engineering
  • Biotechnology and Biomedical Engineering

Background:

  • Alginate hydrogels, derived from brown seaweed, are biocompatible and biodegradable materials.
  • Their properties are controllable via molecular structure, crosslinking, and modifications.

Purpose of the Study:

  • To review recent advances in alginate hydrogel design, crosslinking, and modification strategies.
  • To explore diverse applications and identify challenges for clinical translation.

Main Methods:

  • Systematic review of literature on alginate hydrogel design and fabrication.
  • Analysis of crosslinking approaches (ionic, covalent, hybrid) and modification strategies (derivatization, blending, nanoparticles).
  • Examination of advanced fabrication techniques (3D/4D printing, microfluidics, electrospinning).

Main Results:

  • Modifications improve mechanical strength and biological inertness of alginate hydrogels.
  • Applications span drug delivery, tissue engineering, wound healing, environmental remediation, food industry, flexible electronics, and soft robotics.
  • Preclinical and clinical studies show feasibility, but challenges in degradation, mechanics, standardization, regulation, and scalability persist.

Conclusions:

  • Alginate hydrogels are versatile biomaterials with expanding applications.
  • Further research is needed to overcome limitations for successful clinical translation and commercialization.