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.
Results
Showing 1 to 20 of 34 for “"layer-by-layer assembly"”.
-
Layer-by-layer assembly in confined geometries
The fundamental nature of layer-by-layer (LbL) assembly in confined geometries was investigated for a number of different chemical systems. The first part of this thesis concerns the modification of microfluidic and nanofluidic devices which hold great potential as a platform for manipulation and …
-
Layer-by-layer assembly of conducting membranes for photoelectrochemical cells
Spray-assisted layer-by-layer (Spray-LbL) assembly is used to achieve vertical transfer of silicon microwire arrays into an ion-conducting, ultrathin polymer membrane. The choice of LbL platform and the properties of the silicon surface control the film morphology, generating either a conformal …
-
Multi-component protein films by layer-by-layer : assembly and electron transfer
… on heterogeneous electron transfer of monolayers of this protein on gold. An important advance was the fabrication of cyt.c multilayers by electrostatic layer-by-layer self-assembly. The ease of fabrication, the stability, and the controllable permeability of polyelectrolyte multilayers …
-
Hydrogen-bonded layer-by-layer assembly of poly(vinyl alcohol) and tannic acid
Hydrogen-bonded multilayer thin films containing tannic acid (TA) and poly(vinyl alcohol) (PVA) were assembled under different pH conditions, and film growth and dissolution behavior was assessed through profilometry. Optimal film growth was achieved at pH 4.0, which contrasted with uncontrollable …
-
Surface engineering using layer-by-layer assembly of pH-sensitive polymers and nanoparticles
… particles and porous membranes has been achieved by using layer-by-layer assembly of pH-sensitive polymers and nanoparticles. In the first part of this thesis, hydrogen-bonded multilayer coatings comprising poly(acrylic acid) and polyacrylamide were used to functionalize spherical colloidal …
-
Evaluation of layer-by-layer assembly of polyelectrolyte multilayers in cell patterning technology
The layer-by-layer assembly of polyelectrolytes into multilayered films is an attractive approach for fabricating novel biomaterials, as it offers tremendous control over the internal composition and surface properties of their layered architectures. In this work, polyelectrolyte multilayers (PEMs) …
-
Investigation of layer-by-layer assembly and M13 bacteriophage nanowires for dye-sensitized solar cells
… required in development of nanoscale materials. Layer-by-layer (LbL) assembly allows for the incorporation of a wide range of functional materials into structured thin films based on the alternate adsorption of cationic and anionic species. Biomolecules, and in particular viruses, show great …
-
Quantum dot encoded magnetic beads for multiplexed fluorescence biosensing
… of quantum dot encoded beads prepared using layer-by-layer assembly of different colour quantum dots around a magnetic bead. To achieve this, two different strategies were used to make “coloured” barcodes. The first strategy used thiol chemistry to immobilise quantum dots in a layer-by-layer …
-
DNA Hybridization and Ligation for Directed Colloidal Assembly
Another conventional method of colloidal assembly we pursued was sedimentation via slow centrifugation. The salt requirement for DNA hybridization and ligation made it necessary to use slow salt addition through a dialysis membrane to achieve well-ordered colloidal crystals. Well-ordered …
-
Toward a drug delivery coating for intraocular lenses
Layer-by-layer assembly has become a quintessential tool for the creation of versatile, dynamic nanostructured materials able to dictate cellular behavior through exquisite surface functionality and delivery of bioactive agents. The primary aim of this work was to use layer-by-layer assembly to …
-
Evaluation of superhydrophilic polyelectrolyte multilayered films for anti-fogging applications
Polyelectrolyte multilayered (PEM) films created by an aqueous-based layer-by-layer assembly technique have been widely studied in the past decade. Owing to the simple, versatile and yet well-controlled nature of this technique, many potential applications of these thin films have also been …
-
Fundamental studies of polyelectrolyte multilayer films : optical, mechanical, and lithographic property control
Polyelectrolyte multilayers (PEMs) are a versatile type of thin film that is created via layer-by-layer assembly of positively and negatively charged polymers from aqueous solutions. Precise control of the PEM thickness, chemical functionality, and molecular architecture is made possible by …
-
An integrated microelectronic device for biomolecular amplification and detection
… substrates. Based on electronic detection of layer-by-layer assembly of polyelectrolytes, the sensing technique can specifically quantify double-stranded DNA product in unprocessed samples and monitor the product concentration at various stages of PCR to generate readout analogous to that of a …
-
Particle sensors based on amplified quenching of conjugated polymers for biosensing applications
… The CP core of the particle can be made using layer-by-layer assembly, a versatile technique that forms uniform polymeric films through non-covalent interactions. To measure the response of CP core particles in aqueous environments, a quantitative ratiometric approach was developed to account …
-
Nucleic base-directed adsorption of colloids and polyelectrolytes
… advancement of selective adsorption techniques by use of new interactions and development of new approaches to the directed assembly of colloidal species. The ability to control the assembly from solution of complex and composite surface arrays by chemical patterning of surfaces is of great …
-
Elektrochemische Prozesse an strukturierten Substraten für Anwendungen in neuartigen Leitungstechnologien
… basiert auf leitfähigen Kolloiden, die mittels Layer-by-Layer-Assembly (LbL) mit einer leitfähigen Goldschale versehen wurden. Die Leitfähigkeit wurde mittels UV/Vis- und XP-Spektroskopie untersucht. Derartig leitfähige Partikel konnten einer selektiven Oberflächenadsorption auf mittels …
-
Engineering the electrochromism and ion conduction of layer-by-layer assembled films
This work applies the processing technique of layer-by-layer (LBL) assembly to the creation and development of new electrochemically active materials. Elements of the thin-film electrochromic cell were chosen as a particular focus for LBL fabrication. Layer-by-layer assembly is the ideal processing …
-
Nanoscale modification of key surface parameters to augment pool boiling heat transfer and critical heat flux in water and dielectric fluids
… nickel and stainless steel substrates using the layer-by-layer assembly method. This study shows that such coatings, with thicknesses on the order of one micron or less, are capable of enhancing the critical heat flux of water up to 100%, and enhancing the nucleate boiling heat transfer …
-
Tribological and mechanical characterizations of polyelectrolyte multilayer nanoassemblies
Over the last decade, the sequential layer-by-layer assembly of oppositely charged polyelectrolytes has received much interest for the deposition of film architectures, ranging from tens to hundreds of nanometers in thickness, that can be precisely tuned as a function of the processing conditions. …
-
Nanostructured electrospun fibers : from superhydrophobicity to block copolymer self-assembly
… that superhydrophobic fabrics can be made by either electrospinning a hydrophobic material or applying post-treatment to electrospun mats (e.g. through initiated chemical vapor deposition). Based on an understanding of the role of fibrous structure to create a surface of suitable topology, …
Page 1 of 2