Taylor instabilities in colloidal crystals
نویسندگان
چکیده
2014 Recently we have developed a Couette viscosimeter for studying the shearing of colloidal crystals. We report here that with increasing shear rate the colloidal crystal melts (for 03C9crit) and above a critical shear rate, 03C9T0, Taylor instabilities develop. After stopping the shearing flow the suspension recrystallizes in a special texture which preserves the pattern of the Taylor rolls. This texture determines the configuration of Taylor instabilities in subsequent flow experiments. Tome 46 N° 3 ler FÉVRIER 1985 LE JOURNAL DE PHYSIQUE LETTRES J. Physique Lett. 46 (1985) L-91 L-96 ler FÉvRIER 1985, Classification Physics Abstracts 82 . 70 47 . 20 62 . 20
منابع مشابه
Fabricating colloidal crystals and construction of ordered nanostructures
Colloidal crystals of polymeric or inorganic microspheres are of extensive interest due to their potential applications in such as sensing, optics, photonic bandgap and surface patterning. The article highlights a set of approaches developed in our group, which are efficient to prepare colloidal crystals with ordered voids, patterned colloidal crystals on non-planar surfaces, heterogeneous coll...
متن کاملPhotonic crystals Fabrication of Tunable Spherical Colloidal Crystals Immobilized in Soft Hydrogels**
Spherical colloidal crystals are three-dimensional periodic arrays of monodisperse colloidal particles with a spherical geometry. The spatial periodicity of the refractive index of the colloidal crystalline arrays results in an optical stop band and, hence, they act as photonic crystals in the optical regime. In contrast to conventional film-type colloidal crystals where the crystals are aligne...
متن کاملFabrication of colloidal crystals composed of pore-expanded mesoporous silica nanoparticles prepared by a controlled growth method.
Colloidal crystals composed of mesoporous silica nanoparticles (MSNs) are expected to have various applications because of their unique hierarchical structures and tunable functions. The expansion of the mesopore size is important for introducing guest species which cannot be accommodated by using conventional colloidal crystals of MSNs; however, the preparation of MSNs with a controllable pore...
متن کاملتغییرات ساختاری بلورمایع نماتیک آمیخته به نانوکلوئیدهای مغناطیسی
The stable colloidal dispersions of magnetic nano-particles in nematic liquid crystals are called ferronematics. Their behaviour in magnetic fields depends on various parameters such as anchoring energy, magnetic anisotropy, and shape and volume fraction of the particles. In the present paper, the threshold field is obtained for these colloidal nematics. Then, the influence of magnetic anisotr...
متن کاملNonspherical colloidal crystals fabricated by the thermal pressing of colloidal crystal chips.
Nonspherical colloids and their ordered arrays may be more attractive in applications such as photonic crystals than their spherical counterparts because of their lower symmetries, although such structures are difficult to achieve. In this letter, we describe the fabrication and characterization of colloidal crystals constructed from nonspherical polyhedrons. We fabricated such nonspherical col...
متن کامل