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Order and fluidity often coexist, with examples ranging from biological membranes to liquid crystals, but the symmetry of these soft-matter systems is typically higher than that of the constituent building blocks. We dispersed micrometer-long inorganic colloidal rods in a nematic liquid crystalline fluid of molecular rods. Both types of uniaxial building blocks, while freely diffusing, interact to form an orthorhombic nematic fluid, in which like-sized rods are roughly parallel to each other and the molecular ordering direction is orthogonal to that of colloidal rods. A coarse-grained model explains the experimental temperature-concentration phase diagram with one biaxial and two uniaxial nematic phases, as well as the orientational distributions of rods. Displaying properties of biaxial optical crystals, these hybrid molecular-colloidal fluids can be switched by electric and magnetic fields.
| Authors: | Haridas Mundoor; Sungoh Park; Bohdan Senyuk; Henricus H. Wensink; Ivan I. Smalyukh | |
| Journal: | Science | |
| Volume: | 360 | |
| edition: | 6390 | |
| Year: | 2018 | |
| Pages: | 768 | |
| DOI: | 10.1126/science.aap9359 | |
| Publication date: | 18-May-2018 |
Random number generators go public
On 10 July, researchers in Chile will unveil an online public random number service. Later in July, the U.S. National Institute of Standards and Technology (NIST) will launch its Randomness Beacon as a permanent service, upgrading a pilot program that began in 2013. Brazil, too, is planning ... more
When the cure kills—CBD limits biodiversity research
The Convention on Biological Diversity (CBD) commits its 196 nation parties to conserve biological diversity, use its components sustainably, and share fairly and equitably the benefits from the utilization of genetic resources. The last of these objectives was further codified in the Conve ... more
See-through solar cells could power offices
Solar windows turn some of the light shining through into electricity. They've been on the market for years. But many of these windows absorb some visible light, leaving them with a reddish or brownish hue, a trait frowned on by architects. Now, new versions are on the way that absorb invis ... more
Merck Named a Top Employer by Science Magazine
Merck announced it was ranked fourth among biotechnology and pharmaceutical companies worldwide by Science magazine, a leading peer-reviewed international scientific publication. This ranking marks the fourth year in a row Merck was named one of the top 20 employers in the healthcare and li ... more
Merck Named as Top Employer by Science Magazine
Merck announced it was named number 11 among the top 20 employers in the global biopharmaceutical industry by Science magazine, a leading peer-reviewed international scientific publication. This is the third year in a row that Merck, including EMD Serono in the United States, has been named ... more
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