Rubbing methods

In fact, parallel processes for patterning densely packed nanostructures are required in diverse areas of nanotechnology (Kim et al., 2003). The regular nanostructures self-assembled in bulk films of PEO-based azo LCBCs provide the opportunity to prepare such parallel stripe pattern by SMCM. To achieve this. 

Rubbing technique Self-assembly of blocit copolymers Supramolecular cooperative motions 

In nondoped films of PEO-based azo LCBCs with well-defined structures macroscopic parallel patterning of PEO nanocylinders can be obtained easily in an arbitrary area by simple and convenient photocontrol. Furthermore, the non-contact method might provide the opportunity to control nanostructures even on curved surfaces. On the basis of the principle of SMCM, the orientation of microphase-separated nanocylinders dispersed in azo LC matrix should agree with the alignment direction of azo mesogens. The azo molecules can be 3-D 

The control process was carried out at 50°C. All the PEO nanocylinders were aligned along the electrolytic field, in spite of the non-microphase-separated state. 

Similar to the electric field, the magnetic field can be used to luanipulate the microphase separation in azo LCBCs by SMCM. The noncontact orientation 

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Miyata, H. Kuroda, K. Alignment of mesoporous silica on a glass substrate by a rubbing method. Chem. Mater. 1999, 11 (6), 1609-1614. 

Four different test methods are outlined to simulate the most common ways that materials are exposed to water drip, spray, submersion and a rub method. Actually, the method of water application may greatly affect the outcome of the test. While one or more of the test methods may be performed, to best qualify a product aU four test methods described in the standard should be used. The drip and spray test are evaluated visually, while the submersion and rub tests can be evaluated visually and instrumentally. 

The advantage of this method is that it is suitable for mass production. However, the rubbing method has certain drawbacks, including the production of dust and electrostatic charges, which is particularly disadvantageous for manufacturing high-performance LCDs. 

From the early stages of LCD production in the 70s, only the rubbing method has been adopted for alignment technologies. The rubbing method is a simple, convenient, and low-cost, and it is considered unlikely that the rubbing method... 

In Fig. 4.5.2, the liquid crj tal molecules in different domains are shown separated by the protrusions and the molecules decline in different directions on applying an electric field. In a given domain, not only on the protrusion, but also on the alignment layer parallel to the substrates, the liquid crystal molecules decline in the same direction. Unlike the rubbing method, this method involves no complicated procedures. 

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