{"id":28020,"date":"2024-07-11T20:13:14","date_gmt":"2024-07-11T18:13:14","guid":{"rendered":"https:\/\/www.linseis.com\/applikationen\/chip-dsc-100-xerogel-nanoparticles\/"},"modified":"2026-07-29T12:04:50","modified_gmt":"2026-07-29T10:04:50","slug":"chip-dsc-100-xerogel-nanoparticles","status":"publish","type":"applikationen","link":"https:\/\/www.linseis.com\/en\/applications\/material-analysis-in-the-chemical-industry\/chip-dsc-100-xerogel-nanoparticles\/","title":{"rendered":"Chip-DSC 100 (Chip-DSC L66 Ultimate) \u2013 Xerogel Nanoparticles"},"content":{"rendered":"\t\t
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A gel<\/strong> is a colloidal system consisting of a continuous solid phase that encloses or permeates a liquid phase (often water). It behaves like a solid and is elastic, even though it consists largely of liquid. Gels are formed by the cross-linking of polymers or colloidal particles, which create a three-dimensional network that encloses the liquid. <\/p>

Gels are classified as non-Newtonian fluids<\/strong>, which means that their flow properties do not follow the laws of classical Newtonian viscosity. Unlike Newtonian fluids, whose viscosity remains constant, non-Newtonian fluids such as gels respond differently to shear forces. Their viscosity can change under mechanical stress, such as pressure or stretching. As a result, gels exhibit viscous properties under slow deformation but tend to behave in a more solid or elastic manner under rapid or intense stress. <\/p>

The cross-linking in the liquid phase gives it its macroscopically \u201csolid\u201d character. Gels come in various types and forms and are frequently used in pharmaceuticals or as adhesives. <\/p>

A special type of gel is the so-called xerogel, from which the swelling agents are typically removed. Examples of xerogels include dried silica gel and gelatin. <\/p>

Gels can be easily prepared using differential scanning calorimetry<\/strong><\/a> (DSC), as is often done in quality control.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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The curve shows a DSC scan of aluminum oxide nanoparticles in a gel matrix, heated at a linear heating rate of 10 K\/min in a nitrogen atmosphere.<\/p>

The signal shows two significant effects during the run that are worth examining more closely:
In the range up to 120 \u00b0C, water loss occurs, which is due to the change in mass<\/strong><\/a> of the sample Cp change<\/strong><\/a> caused by thechange in massof the sample.<\/p>

As a result of this effect, a dry gel matrix containing nanoparticles remains\u2014known as a xerogel. At approximately 200 \u00b0C, a phase transition<\/strong><\/a> of the nanoparticles from an ordered to an amorphous aluminum oxide structure, which can be identified as a small, sharp peak. <\/p>

These two effects are reproducible and provide a good characterization of the nanoparticle gel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Appropriate measuring device<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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