@phdthesis{Abouserie2018, author = {Abouserie, Ahed}, title = {Ionic liquid precursors for multicomponent inorganic nanomaterials}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-418950}, school = {Universit{\"a}t Potsdam}, pages = {xx, 193}, year = {2018}, abstract = {Health effects, attributed to the environmental pollution resulted from using solvents such as benzene, are relatively unexplored among petroleum workers, personal use, and laboratory researchers. Solvents can cause various health problems, such as neurotoxicity, immunotoxicity, and carcinogenicity. As such it can be absorbed via epidermal or respiratory into the human body resulting in interacting with molecules that are responsible for biochemical and physiological processes of the brain. Owing to the ever-growing demand for finding a solution, an Ionic liquid can use as an alternative solvent. Ionic liquids are salts in a liquid state at low temperature (below 100 C), or even at room temperature. Ionic liquids impart a unique architectural platform, which has been interesting because of their unusual properties that can be tuned by simple ways such as mixing two ionic liquids. Ionic liquids not only used as reaction solvents but they became a key developing for novel applications based on their thermal stability, electric conductivity with very low vapor pressure in contrast to the conventional solvents. In this study, ionic liquids were used as a solvent and reactant at the same time for the novel nanomaterials synthesis for different applications including solar cells, gas sensors, and water splitting. The field of ionic liquids continues to grow, and become one of the most important branches of science. It appears to be at a point where research and industry can work together in a new way of thinking for green chemistry and sustainable production.}, language = {en} } @phdthesis{Adelhelm2007, author = {Adelhelm, Philipp}, title = {Novel carbon materials with hierarchical porosity : templating strategies and advanced characterization}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-15053}, school = {Universit{\"a}t Potsdam}, year = {2007}, abstract = {The aim of this work was the generation of carbon materials with high surface area, exhibiting a hierarchical pore system in the macro- and mesorange. Such a pore system facilitates the transport through the material and enhances the interaction with the carbon matrix (macropores are pores with diameters > 50 nm, mesopores between 2 - 50 nm). Thereto, new strategies for the synthesis of novel carbon materials with designed porosity were developed that are in particular useful for the storage of energy. Besides the porosity, it is the graphene structure itself that determines the properties of a carbon material. Non-graphitic carbon materials usually exhibit a quite large degree of disorder with many defects in the graphene structure, and thus exhibit inherent microporosity (d < 2nm). These pores are traps and oppose reversible interaction with the carbon matrix. Furthermore they reduce the stability and conductivity of the carbon material, which was undesired for the proposed applications. As one part of this work, the graphene structures of different non-graphitic carbon materials were studied in detail using a novel wide-angle x-ray scattering model that allowed precise information about the nature of the carbon building units (graphene stacks). Different carbon precursors were evaluated regarding their potential use for the synthesis shown in this work, whereas mesophase pitch proved to be advantageous when a less disordered carbon microstructure is desired. By using mesophase pitch as carbon precursor, two templating strategies were developed using the nanocasting approach. The synthesized (monolithic) materials combined for the first time the advantages of a hierarchical interconnected pore system in the macro- and mesorange with the advantages of mesophase pitch as carbon precursor. In the first case, hierarchical macro- / mesoporous carbon monoliths were synthesized by replication of hard (silica) templates. Thus, a suitable synthesis procedure was developed that allowed the infiltration of the template with the hardly soluble carbon precursor. In the second case, hierarchical macro- / mesoporous carbon materials were synthesized by a novel soft-templating technique, taking advantage of the phase separation (spinodal decomposition) between mesophase pitch and polystyrene. The synthesis also allowed the generation of monolithic samples and incorporation of functional nanoparticles into the material. The synthesized materials showed excellent properties as an anode material in lithium batteries and support material for supercapacitors.}, language = {en} } @phdthesis{Akdemir2009, author = {Akdemir, {\"O}zg{\"u}r}, title = {Synthesis of novel non-viral gene carriers via atom transfer radical polymerization and click chemistry}, address = {Potsdam}, pages = {X, 121 S. : Ill., graph. Darst.}, year = {2009}, language = {en} } @phdthesis{AlNakeeb2019, author = {Al Nakeeb, Noah}, title = {Self-assembly and crosslinking approaches of double hydrophilic linear-brush block copolymers}, pages = {133}, year = {2019}, language = {en} } @phdthesis{Alahverdjieva2007, author = {Alahverdjieva, Veneta}, title = {Experimental study of mixed protein/surfactant systems at the aqueous solution/air interface}, address = {Potsdam}, pages = {XIV, 146 S., X : graph. Darst.}, year = {2007}, language = {en} } @phdthesis{Ali2005, author = {Ali, Abu Md. Imroz}, title = {Morphology control in nanoscopic composite polymer particles}, address = {Potsdam}, pages = {97, XXXV S. : Ill., graph. Darst.}, year = {2005}, language = {en} } @phdthesis{Altabal2021, author = {Altabal, Osamah}, title = {Design and fabrication of geometry-assisted on-demand dosing systems}, doi = {10.25932/publishup-53244}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-532441}, school = {Universit{\"a}t Potsdam}, pages = {xxiv, 122}, year = {2021}, abstract = {The controlled dosage of substances from a device to its environment, such as a tissue or an organ in medical applications or a reactor, room, machinery or ecosystem in technical, should ideally match the requirements of the applications, e.g. in terms of the time point at which the cargo is released. On-demand dosage systems may enable such a desired release pattern, if the device contain suitable features that can translate external signals into a release function. This study is motivated by the opportunities arising from microsystems capable of an on-demand release and the contributions that geometrical design may have in realizing such features. The goals of this work included the design, fabrication, characterization and experimental proof-of-concept of geometry-assisted triggerable dosing effect (a) with a sequential dosing release and (b) in a self-sufficient dosage system. Structure-function relationships were addressed on the molecular, morphological and, with a particular attention, the device design level, which is on the micrometer scale. Models and/or computational tools were used to screen the parameter space and provide guidance for experiments.}, language = {en} } @phdthesis{Ambrogi2015, author = {Ambrogi, Martina}, title = {Application of Poly(Ionic Liquid)s for the synthesis of functional carbons}, school = {Universit{\"a}t Potsdam}, pages = {125}, year = {2015}, language = {en} } @phdthesis{Andersen2005, author = {Andersen, Audr{\´e}e}, title = {Surfactant dynamics at interfaces : a series of second harmonic generation experiments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-6553}, school = {Universit{\"a}t Potsdam}, year = {2005}, abstract = {Adsorption layers of soluble surfactants enable and govern a variety of phenomena in surface and colloidal sciences, such as foams. The ability of a surfactant solution to form wet foam lamellae is governed by the surface dilatational rheology. Only systems having a non-vanishing imaginary part in their surface dilatational modulus, E, are able to form wet foams. The aim of this thesis is to illuminate the dissipative processes that give rise to the imaginary part of the modulus. There are two controversial models discussed in the literature. The reorientation model assumes that the surfactants adsorb in two distinct states, differing in their orientation. This model is able to describe the frequency dependence of the modulus E. However, it assumes reorientation dynamics in the millisecond time regime. In order to assess this model, we designed a SHG pump-probe experiment that addresses the orientation dynamics. Results obtained reveal that the orientation dynamics occur in the picosecond time regime, being in strong contradiction with the two states model. The second model regards the interface as an interphase. The adsorption layer consists of a topmost monolayer and an adjacent sublayer. The dissipative process is due to the molecular exchange between both layers. The assessment of this model required the design of an experiment that discriminates between the surface compositional term and the sublayer contribution. Such an experiment has been successfully designed and results on elastic and viscoelastic surfactant provided evidence for the correctness of the model. Because of its inherent surface specificity, surface SHG is a powerful analytical tool that can be used to gain information on molecular dynamics and reorganization of soluble surfactants. They are central elements of both experiments. However, they impose several structural elements of the model system. During the course of this thesis, a proper model system has been identified and characterized. The combination of several linear and nonlinear optical techniques, allowed for a detailed picture of the interfacial architecture of these surfactants.}, subject = {Tensid}, language = {en} } @phdthesis{Antipov2003, author = {Antipov, Alexei}, title = {Polyelectrolyte multilayer capsules as controlled permeability vehicles and catalyst carriers}, pages = {100 S.}, year = {2003}, language = {en} }