Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Photopatterning"”.
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Maskless photopatterning of cells in microfluidic devices/
Upon examining current methods for printing and patterning of live biological cells, there is a need for a method capable of printing with the resolution of single biological cells to organize them into complex structures. In order to fill this need, building upon previous design of a dynamic …
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Tailoring Fluorene-based Oligomers for micron and sub-micron sized Photopatterning
… of their electro-optical properties during photopatterning. Further on the requirements for material synthesis are easy procedures and large quantities. Therefore we developed an approach, which produces large quantities combined with the adjustment of the desired properties in one single …
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Directed Assembly of Three-Dimensional Microvascular Networks
… within the vascular network by a secondary photopatterning process. These vertical towers give rise to chaotic advection of the fluid streams and dramatic improvements in mixing relative to simple straight (1-D) and square-wave (2-D) channels while significantly reducing the device planar …
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Development of Self -Healing Polymer Composites and Photoinduced Ring -Opening Metathesis Polymerization
… results in the application of PROMP towards photopatterning and creation of microchannels for potential application in microfluidic devices is described.
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Surface Patterning, Electronic Device Fabrication And, Three-Dimensional Self-Assembly Using Polydimethylsiloxane
… zone (UVO) exposure mask, which allows for the photopatterning of UVO modifications of PDMS surfaces. This modification enables the direct photoinitiated patterning of discrete PDMS patterns without the use of a master. The UVO activated PDMS regions are chemically bonded to oxide bearing …
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Stimuli responsive polymer gels for sensing applications
… required for sol-gel preparation and the area of photopatterning of sub-micron 3 D structures.This chapter describes the synthesis and characterisation of hybrid sol-gel materials co-polymerised with a monomer based on the light responsive chromophore Spiropyran (SP). The hybrid materials contain …
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Development of a direct photochemical method for the generation of biomolecular interfaces for applications in leukocyte biology
… substrates for proof-of-principle biomolecular photopatterning demonstrations, as well as investigations of multi-parameter cell-substrate interactions and fundamental leukocyte biology studies. Substrates tailored to present P-selectin or E-selectin, which are proteins expressed on the inflamed …
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Plasmon Directed Chemical Reactivity and Nanoparticle Self-Assembly
… for, among other assembly methods, reverse photopatterning. I further show that this photocleavable ligand can be used in conjunction with gold nanospheres to create aligned, metal structures on silver nanospheroid surface by exposure to linearly polarized UV light. Similarly, I also …
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Design and Testing of a Hydrogel-Based Droplet Interface Lipid Bilayer Array System
… each pair of monolayers come into contact. The photopatterning technique is used to produce small arrays of hydrogels on top of a simple electrode pattern. Systems utilizing the microchannel substrate are used to create mesoscale hydrogel arrays of up to 3x3 that maintained a low resistance …
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Three-Dimensional Biomimetic Patterning to Guide Cellular Migration and Organization
This thesis develops a novel photopatterning strategy for biomimetic scaffolds that enables spatial and biochemical control of engineered cellular architectures, such as the microvasculature. Intricate tools that allow for the three dimensional (3D) manipulation of biomaterial microenvironments …
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A robotic system for photopatteming of freeform surfaces
… of a robotic system capable of maskless photopatterning on objects having complex curvature and dimensions ranging from centimeters to meters. The system incorporates a six-axis serial robot arm, a high-precision rotary stage, a custom-built DLPbased end effector, and custom software that …
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Design of Engineered Biomaterial Architectures Through Natural Silk Proteins
… engineered architectures, a method for silk photopatterning was explored, enabling the direct fabrication of biologically-relevant structures at the micro and nanoscales. Using a facile bioconjugation strategy, native silk proteins could be transformed into proteins with a photoactive …
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Functional polymer layers with protected amines
… functional polymers like the capability for photopatterning and anchoring onto gold substrates make them very interesting for nanotechnology applications.
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The heterogeneous biochemical modification of porous collagen scaffolds for tissue engineering applications
The extracellular matrix is a complex and dynamic collection of collagens, non-collagenous matrix proteins, glycosaminoglycans and growth factors. The ECM plays a significant role in guiding the behavior of cells in their tissue specific niche. The recapitulation of both the mechanical and …
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Immiscible liquid-liquid displacement in microfluidic channels : effects of wettability and geometry
… methods that can provide design flexibility with photopatterning, the ability to tailor wetting properties, and the calcium carbonate structure that is the most common constituent of oil reservoirs. We utilize a microscope projection lithography to construct polymeric structures with pre-defined …
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Development, characterization and applications of a direct, general method to photochemically generate patterns and gradients on planar glass substrates, corrugated substrates and in highly porous collagen-GAG scaffolds
Recent surface chemical approaches to physically modeling the extra-cellular matrix (ECM) have provided invaluable insight into the molecular nature of cell adhesion and have clearly established the contributions of altered cell adhesion to disease onset and progression. In order to better …
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Patterning planar surfaces with motor proteins: Towards spatial control over motile microtubules
… visible light is in comparison to other UV-based photopatterning techniques non-damaging to proteins.
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Weak polyacid brushes : synthesis, swelling behavior, complex formation and micropatterning
… be reproducibly adjusted. Furthermore, different photopatterning strategies were implemented into the concept of surface-initiated polymerization. Using different approaches, positive and negative images of a mask and, in particular, laterally chemically microstructured polymer brushes could be …
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Design and Characterisation of Hybrid Organic-Inorganic Materials for Luminescence Downshifting Devices
… kinetics, which are key to the waveguide photopatterning step and consequently the material structure. Chapter 5 describes the effect of the lumophore species on the photopolymerisation kinetics of the homopolymers and blended materials. Moreover, the fabrication of photopatterned …
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Part I - Access to UV photocured nanostructures via selective morphological trapping of block copolymer melts. Part II - Morphological phase behavior of poly(RTIL) containing block copolymer melts
… dissolved or dispersed when swollen. Simple photopatterning of the cross-linked hydrogel system is also explored. The developed pre-structured hydrogel network was then adapted to incorporate light sensitive anthracene groups into the spherical forming AB diblock copolymer for in situ …