|
|
Macromolecular avenues for the creation of bio-inspired hierarchically structured surfaces
Wang, Yu-Min ; Pop-Georgievski, Ognen (vedoucí práce) ; Kostka, Libor (oponent) ; Sedláček, Ondřej (oponent)
Pro potlačení nežádoucích nespecifických interakcí mezi materiály používanými v biomedicínských aplikacích a biologickými tekutinami se často využívá pokrytí jejich povrchu polymerními kartáči. Modifikaci je možnou provést metodou "roubování na" (GT) nebo "roubování z" (GF). Tato práce se zabývá studiem hustoty roubování a účinnosti proti zanášení u poly[N-(2-hydroxypropyl) methakrylamidových] (poly(HPMA)) kartáčů syntetizovaných pomocí polymerace s vratným adičně-fragmentačním přenosem řetězce (RAFT) s využitím technik GT i GF. Ke stanovení molárních hmotností poly(HPMA) připraveného v roztoku a na povrchu byla kombinována a důkladně využita rozměrově vylučovací chromatografie (SEC) vybavená více úhlovým detektorem rozptylu světla (MALS) a silová spektroskopie jedné molekuly (SMFS) založená na mikroskopii atomárních sil (AFM). Dále byl zkoumán vliv rozpouštědla na kinetiku růstu polymerních kartáčů během povrchově iniciované polymerizace (SI-RAFT). Byly experimentálně zjištěny rozdíly mezi řetězci poly(HPMA) narostlými z povrchu a vzniklými v roztoku. Zejména složení rozpouštědla ovlivnilo rychlost propagace i odvozenou hustotu roubování z povrchu narostlého poly(HPMA) v důsledku změn v botnání polymeru, které se připisují vodíkovým vazbám. Tato práce využívá kombinace metod SEC-MALS a AFM-SMFS...
|
|
|
Gecko mimicking surfaces
Fecko, Peter ; Boušek, Jaroslav (oponent) ; Pekárek, Jan (vedoucí práce)
Adhesive capabilities of a gecko lizard have been the subject of many studies and an inspiration for many artificial imitations and inventions. This work proposes a design version of synthetic gecko structures in a form of micro-pillars, that would have similar adhesion capabilities as gecko setae. Structures made of Parylene C polymer have been created using photolithography and silicon etching techniques. Following focus was on various methods of surface modifications and characterisation of these structures to determine the adhesion forces on their surface, before and after modifications.
|
|
|
Numerical analysis of bio-mimetic concept for active flow control on wing surface
Čermák, Jakub ; Navrátil, Jan (oponent) ; Popela, Robert (vedoucí práce)
In this paper optimization on airfoil equipped with upper-side elastic flap is carried out. The optimization process is done by using of URANS CFD method. In first chapters the history of development of wing with movable flaps is briefly described. The paper continues with description and motivation on choice of computational method. Geometry and mesh generation is briefly explained. Verification and validation of computational method is also presented. The actual case study is focused on airfoil LS(1)-0417mod equipped with 20%, 30% and 40% long rigid flap on various angles of attack. The aerodynamic performance of each case is discussed together with the flow-field analysis. The non-linear structural analysis using FEM software is carried out in order to evaluate elastic flap bending stiffness and deformed shape to fulfil self-adaptive requirements.
|
|
|
Gecko Mimicking Surfaces
Fecko, Peter
Adhesive capabilities of a gecko lizard have been the subject of many studies and an inspiration for many artificial imitations and inventions. This work proposes a design of synthetic gecko mimicking structures in a form of micro-pillars, that would have similar adhesion capabilities as gecko setae. Structures made of Parylene C have been created using photolithography and silicon etching methods. Following focus will be on various surface modifications and characterisation of these structures to determine the adhesion forces present.
|
|
|
Gecko mimicking surfaces
Fecko, Peter ; Boušek, Jaroslav (oponent) ; Pekárek, Jan (vedoucí práce)
Adhesive capabilities of a gecko lizard have been the subject of many studies and an inspiration for many artificial imitations and inventions. This work proposes a design version of synthetic gecko structures in a form of micro-pillars, that would have similar adhesion capabilities as gecko setae. Structures made of Parylene C polymer have been created using photolithography and silicon etching techniques. Following focus was on various methods of surface modifications and characterisation of these structures to determine the adhesion forces on their surface, before and after modifications.
|
|
|
Numerical analysis of bio-mimetic concept for active flow control on wing surface
Čermák, Jakub ; Navrátil, Jan (oponent) ; Popela, Robert (vedoucí práce)
In this paper optimization on airfoil equipped with upper-side elastic flap is carried out. The optimization process is done by using of URANS CFD method. In first chapters the history of development of wing with movable flaps is briefly described. The paper continues with description and motivation on choice of computational method. Geometry and mesh generation is briefly explained. Verification and validation of computational method is also presented. The actual case study is focused on airfoil LS(1)-0417mod equipped with 20%, 30% and 40% long rigid flap on various angles of attack. The aerodynamic performance of each case is discussed together with the flow-field analysis. The non-linear structural analysis using FEM software is carried out in order to evaluate elastic flap bending stiffness and deformed shape to fulfil self-adaptive requirements.
|
host ::
RSS.