Electrohydrodynamic Patterning of Functional Materials by Pola Goldberg Oppenheimer

By Pola Goldberg Oppenheimer

This thesis explores a path to set off and regulate the constitution formation method in skinny movies via robust electrical fields. We examine, identify and follow using the electrohydrodynamic (EHD) lithography as a flexible patterning device at the sub-micrometre and nanometre size scales for sensible fabrics. skinny motion pictures are ubiquitous, they're present in nature and utilized in virtually each element of way of life. whereas movie instabilities are usually bad in nature and expertise, they are often applied to provide constructions through accurately controlling the destabilization of the movie. EHD lithography makes use of instabilities precipitated via an electrical box to manufacture periodic constructions. EHD patterning is determined to develop into a aggressive candidate for inexpensive lithographic know-how for a few functions. Herein, the utilized power of this lithographic technique is explored via increasing its applicability to a large diversity of fabrics and via a simultaneous patterning of multilayer platforms or sensible polymers yielding hierarchical architectures with novel functionalities.
EHD trend formation permits for example, the fabrication of multi-scale established arrays as floor stronger Raman scattering (SERS)-active structures. additionally, crystalline and conductive polymers are patterned utilizing the EHD procedure and the underlying constitution formation mechanisms are mentioned. This extension in the direction of practical fabric structures deals attention-grabbing clients for power functions. Findings of this thesis are very promising to be used in optoelectronic devices.

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5) where the velocity components u, v, w are the dependent variables to be solved for and g is the gravitational acceleration. The left hand side of a N-S equation is a product of fluid acceleration ρ(dv/dt) and a convective term ρ(v · v) which renders the hydrodynamic equation non-linear. The right hand side of the equation is the total force balance that acts on the fluid element. The forces stem from the pressure gradient at the free interface, the viscous force η∇ 2 v resulting from the momentum transfer from faster to slower moving layers in the fluid and the gravity (ρg).

22) where ε1 , ε2 and ε3 are the static dielectric constants of the three media, n 1 , n 2 and n 3 are the corresponding refractive indexes (ε = n 2 ), and h P is Plank’s constant. The first term gives the zero-frequency energy of the vdW interaction and includes the Keesom and Debye dipolar contributions. The second term is the dispersion energy. kT , the dispersive part usually dominates over the dipolar contribution Since hνe unless the refractive indices of two of the involved materials are similar.

5]): hydrated Si wafers with a native SiOx layer allow the physisorption of organic molecules (stage 1). The trichlorosilane groups hydrolise and form trisilanols (stage 2). lateral mobility of the chain silanes on Si is promoted by an adsorbed water layer yields in-plane reorganization of the silane moecules. The correct thermodynamic conditions allow the formation of a densely packed monolayer comprised of vertical chains. Long silanization times lead to grafting of the monolayer to the surface via the formation of covalent siloxane bonds at the head group-substrate interface (stage 3).

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