{"id":7576,"date":"2019-04-12T09:58:35","date_gmt":"2019-04-12T09:58:35","guid":{"rendered":"https:\/\/website.prod.unilu.spikeseed.cloud\/en\/news\/new-method-inverts-the-self-assembly-of-liquid-crystals\/"},"modified":"2019-04-12T09:58:35","modified_gmt":"2019-04-12T09:58:35","slug":"new-method-inverts-the-self-assembly-of-liquid-crystals","status":"publish","type":"news","link":"https:\/\/www.uni.lu\/en\/news\/new-method-inverts-the-self-assembly-of-liquid-crystals\/","title":{"rendered":"New method inverts the self-assembly of liquid crystals"},"content":{"rendered":"

In liquid crystals, molecules automatically arrange themselves in an ordered fashion. Researchers from the University of Luxembourg have discovered a method that allows an anti-ordered state, which will enable novel material properties and potentially new technical applications, such as artificial muscles for soft robotics. They published their findings in the scientific journal Science Advances.<\/p>\n

\nStudying the characteristics of liquid crystals<\/h2>\n

The research team of Prof. Jan Lagerwall<\/a> at the University of Luxembourg studies the characteristics of liquid crystals, which can be found in many areas ranging from cell membranes in the body to displays in many electronic devices. The material combines liquid-like mobility and flexibility and long-range order of its molecules; the latter is otherwise a typical feature of solid crystals. This gives rise to remarkable properties that render liquid crystals so versatile that they are chosen for carrying out vital functions by nature and by billion-dollar companies alike.<\/p>

Many of a material\u2019s properties depend on the way its molecules are arranged. Since the late 1930s, physicists use a mathematical model to describe the molecular order of liquid crystals. The so-called order parameter assigns a number that indicates how well ordered the molecules are. This model uses a positive range to describe the liquid crystals that we are used to. It can also assign a negative range that describes an \u201canti-ordered\u201d state, where the molecules would avoid a certain direction rather than align along it.<\/p>\n

\nArtful trick<\/h2>\n

So far, this negative range remained strictly hypothetical, as no liquid crystal developed an anti-ordered state in practice. The standard theories for liquid crystals suggest that such a state is possible, but would not be stable. \u201cYou can compare this to a slide that has a very light bump in the middle. You may slow down when you reach the bump, in our case the unstable anti-ordered state, but not enough so you stop, and therefore you will go down all the way to the stable state, the global energy minimum, where you inevitably end up with positive order. If you could manage to stop the ride at the bump, a negative range would be possible,\u201d explains Jan Lagerwall.<\/p>

This is exactly what V.S.R. Jampani<\/a>, the main author of the paper, and co-workers achieved for the first time in their study. \u201cThe trick for preventing the system from reaching the global energy minimum is to gently polymerise it into a loosely connected network while it is dissolved in a normal liquid solvent,\u201d says Dr. Jampani. \u201cThis network is then stretched in all directions within a plane, or compressed along a single direction perpendicular to the plane, such that the molecules forming the network align into the plane, but without any particular direction in that plane.\u201d As the solvent is evaporated the liquid crystal phase forms and, due to the peculiar in-plane stretching of the network, it is forced to adopt the negative order parameter state where the molecules avoid the direction of the normal to the plane. \u201cThis liquid crystal has no choice but to settle with the secondary energy minimum, since the global energy minimum is made inaccessible by the network,\u201d adds Lagerwall.<\/p>\n

\nPotential applications in Robotics<\/h2>\n

When the network is strengthened by a second round of polymerisation, the behaviour as a function of temperature can be studied. \u201cLiquid crystal networks are fascinating for positive as well as negative order parameter, because the ordering\u2014or anti-ordering\u2014in combination with the polymer network allows it to spontaneously change its shape in response to temperature changes. The liquid crystal network is effectively a rubber that stretches or relaxes on its own, without anyone applying a force\u201d says Prof. Lagerwall. It turns out that the behaviour of the negative order parameter liquid crystal rubber is exactly opposite to that of normal liquid crystal rubbers. \u201cOptically, when a normal liquid crystal rubber shows a certain colour between crossed polarisers, the negative order parameter version shows the complementary colour. Mechanically, when a normal liquid crystal rubber contracts along one direction and expands in the plane perpendicular to it, the negative order parameter rubber expands along the first direction and shrinks in the perpendicular plane,\u201d Lagerwall explains.<\/p>

The researchers created their negative order parameter liquid crystal rubbers in the form of millimeter-sized spherical shells, which they then cut into smaller pieces with various shapes. Depending on how the cut was made, a variety of shape changing behaviour could be realised, showing that the system can function as a soft \u201cactuator\u201d, effectively an artificial muscle. Because the negative and positive order liquid crystal rubbers act in opposite ways, this opens for interesting ways to combine the two, to make a more effective composite actuator, for instance for soft robotics. When the positive-order actuator responds slowly, the negative-order one actuates quickly, and vice versa. From a fundamental physics point of view, the physical existence of the previously only theoretically predicted anti-ordered liquid crystal state opens for many interesting experiments as well as theory development for the behaviour of self-organising soft matter.<\/p><\/div><\/section>","protected":false},"excerpt":{"rendered":"

In liquid crystals, molecules automatically arrange themselves in an ordered fashion. Researchers from the University of Luxembourg have discovered a method that allows an anti-ordered state, which will enable novel material properties and potentially new technical applications, such as artificial muscles for soft robotics. 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