Properties of Magic Sand
The properties of Magic Sand when dry and when wet are shown. The 10 thumbnail images summarize the content of the video. Click an image to see the image gallery.
When it is dry, Magic Sand appears to be similar to ordinary beach sand, but exposure to water shows us that this sand is far from ordinary. Magic Sand is hydrophobic, which means that it avoids water. The column-like structures form because they minimize the surface area in contact with water. The hydrophobic qualities of Magic Sand prevent water from sticking to it. As a result, the sand remains dry.
This movie shows the properties of Magic Sand. When it is dry, Magic Sand is free-flowing and cannot form a structure that holds its shape. When Magic Sand is poured into water, it has a silvery sheen and doesn't become wet. It can be molded into structures that hold their shape under water. When the water is poured off, the Magic Sand is dry.
Sand is largely silica that has broken into small grains. At the atomic scale, silica consists of a three-dimensional network of covalently bonded silicon and oxygen atoms. Typically, silica surfaces contain mostly oxygen atoms, many of which are covalently bonded to hydrogen atoms. The surface contains many polar bonds and can hydrogen-bond to water molecules. Therefore water is attracted to silica surfaces, which are said to be hydrophilic (water loving).
Magic Sand also consists of silica grains, but the grains have been specially treated in a way that greatly reduces the attraction of water molecules to their surfaces. In addition, the grains are usually dyed a distinctive color. Water does not wet the surfaces of Magic Sand grains, which are said to be hydrophobic (water fearing).
Embedding Video in Learning Materials
The ChemEd DL encourages you to include this high-quality video in learning materials you create. We provide means to embed the video in a Web page, in a wiki, or in an online course using a course-management system. (If you want to include the video in another kind of learning material, contact us.)
If you create learning materials and make them available through the ChemEd DL, all of our videos may be freely used. For example, you can embed any video into the ChemPRIME wiki, or an online course on the ChemEd Moodle Courses site. For more information about developing resources at ChemEd DL, click here.
This video is owned by the Journal of Chemical Education and copyrighted by the ACS Division of Chemical Education, Inc. All rights reserved. To use the video in your materials at your own institution, you must be a subscriber to JCE Web Software. Subscribe as an individual or an institution at the JCE Online Store.
Individual subscribers are permitted to incorporate video into PowerPoint or other multimedia presentations or into lessons written in HTML, provided the presentations or lessons are restricted to the subscriber’s own class (lecture presentation or course management system where only enrolled students have access). Through an institutional subscription the video becomes available for viewing by any student using a computer within the institution’s range of IP addresses. A student could also incorporate video into a report or presentation and the video would play from computers at the student’s own institution.
When this video is incorporated into other materials, this attribution should be present: Video from JCE Web Software, Chemistry Comes Alive!. Copyright ACS Division of Chemical Education, Inc. Used with permission.
In the box below is HTML code to embed this video into your own Web page. Copy the code and paste it into your Web page code.
ChemPRIME project is a full general chemistry textbook available online through the ChemEd DL. We seek collaborators to add exemplars to ChemPRIME that describe chemistry topics within various contexts, such as biological science, food chemistry, and everyday life. ChemPRIME is built using MediaWiki (the same platform used to build Wikipedia). ChemEd DL encourages users to add ChemEd DL videos to their own exemplars. MediaWiki does not allow full HTML code to be inserted, so the ChemEd DL community has created a MediaWiki extension that enables embedding videos. The extension is installed in ChemPRIME, so the code below allows you to add this video to a ChemPRIME page. More information is at ChemPRIME Help:Media. Contact us if you would like to use this MediaWiki extension on your own wiki.
ChemEd Courses is the ChemEd DL's Moodle course management system. Users can manage their own courses, or develop learning resources in Moodle to share with the community. Moodle does not allow full HTML code to be inserted, so the ChemEd DL community has created a Moodle extension that enables embedding videos. The extension is installed in ChemEd Courses, so the code below allows you to add this video to a course in ChemEd Courses. If you would like to use this Moodle extension within your own Moodle installation, contact us.
ChemPaths is the ChemEd DL's Drupal-powered integrated online textbook. Students can explore a full online textbook or other learning pathways. Instructors can sign-up to build their own pathways through course material. Drupal does not allow full HTML code to be inserted, so the ChemEd DL community has created a Drupal extension that enables embedding videos. The extension is installed in ChemPaths (currently in beta-testing), so the code below allows you to add this video to a course in a pathway. If you would like to use this Drupal extension within your own Drupal installation, contact us.