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 233 for “"Colloid"”.
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Increased Control over Gold Colloid Adsorption on Substrates for Colloid Displacement Lithography
Colloid displacement lithography is proving to be very effective in the designing of nanometer scale electronic devices. Precise control of the structure of matter at the nanometer scale has brought a revolutionary change in science and technology. The use of these nanometer scale devices ranges …
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Progress in colloid propulsion
… deal of work was put into the development of the Colloid Thruster as an electric propulsion system for spacecraft. In spite of the effort by the end of the 70s the programs were stopped in the USA and Europe before any design had gotten to fly in space. An exhaustive study of the literature has …
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A microfabricated colloid thruster array
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2001.
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DNA-colloid systems and micro-rheology
We investigate the behaviour of DNA-colloid systems using micro-rheology, with a view to demonstrating the efficacy of passive particle-tracking methodologies and developing entirely new systems. Chapter 1 introduces the fields of DNA coated colloids (DNACCs) and passive micro-rheology, with a …
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The colloid and surface chemistry of allophane
… that allophane has unusual ion exchange and colloidal properties but much of the surface and colloid chemistry allophane was not well understood. The aim of this project was to investigate the properties of allophane with the view of developing commercial uses and also to understand better …
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Colloid phenomena in surface-modified polymer systems.
The objective of this thesis is the development and application of techniques to study modified polymer surfaces. Scanning probe microscopy (SPM) is used throughout this work as an experimental platform for the development of advanced techniques for the characterisation of polymer surfaces and …
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Development of Colloid Displacement Lithography Platforms for Sensor Applications
… - (PDDA) was used as a base layer for developing colloid displacement lithography platforms for sensor applications. Previous work shows that glass coated with PDDA and exposed to gold acts as a good platform for colloid displacement lithography. However, for actual sensor applications, electrical …
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A study of the colloid obtained from weathered lignite
… </p><p> Tests made on Dakolite show that it has colloidal properties. When the Dakolite is dispersed in water a negative hydrosol is formed, which exhibits the Tyndall effect, precipitated by electrolytes, and can be dialyzed by membranes. </p><p> The material used in this study was found in a …
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Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… all the subtle changes in the phase behavior of colloid-polymer mixtures in different solvents, over the entire region of phase space. Small-angle scattering techniques are used to determine the suspension microstructure and excellent quantitative agreement is demonstrated with PRISM in the …
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Clay colloid mobilization in an iron oxide-coated sand
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1992.
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Studies on the ion-droplet mixed regime in colloid thrusters
Colloid thrusters working with mixtures of ions and droplets are gradually becoming an alternative technology for space micro-propulsion needs in missions requiring high position controllability, compactness and low power consumption. The mechanics of the colloid thruster emission process are …
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Colloid Formation Resulting from Alum Coagulation of Organic-Laden Sourcewaters
… into two operationally defined size fractions; colloidal matter was defined as organic carbon (OC) retained by a 30 kilodalton ultrafiltration membrane, and particulate matter was defined as OC retained by a 1μm glass-fiber filter. Coagulation pH had a considerable impact on residual OC colloid …
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Energy harvesting of low-grade waste heat with colloid based technology
L'abstract è presente nell'allegato / the abstract is in the attachment
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VOID STRUCTURE, COLLOID AND TRACER TRANSPORT PROPERTIES OF STRATIFIED POROUS MEDIA
The characterisation of the properties of porous materials is of great importance in the effective management of natural and manmade systems. A sophisticated network model, 'Pore-Cor', of some of these properties has been previously developed. The present study has significantly extended the scope …
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Colloid Thruster to Teach Advance Electric Propulsion Techniques to Post-secondary Students
<p>Colloid thrusters, and electrospray thrusters as a whole, have been around since the 1960s. When they were first developed, the high efficiency and fine thrust control was overshadowed by the high power requirement for such a low thrust that the system provides. This caused the technology to be …
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Groundwater colloids in two Atlantic coastal plain aquifers : colloid formation and stability
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1988.
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Chemistry of tetravalent plutonium and zirconium : hydrolysis, solubility, colloid formation and redox reactions
… In this study, the hydrolysis, solubility and colloid formation of tetravalent plutonium and zirconium are investigated in 0.5 M HCl/NaCl solution using several complementary methods and the redox behavior of plutonium is investigated in acidic conditions as well. The solubilities of Pu(IV) and …
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Hemodynamic Changes after Endotracheal Intubation with Colloid Loading in Patients with Cerebral Aneurysm
"마취유도 시 후두경 조작과 기도삽관은 환자에게 고혈압과 빈맥을 유발할 수 있다(Morgan, 2006). 뇌동맥류 환자에서 고혈압과 빈맥은 뇌동맥류의 파열을 야기할 수 있고 이는 환자의 치사율을 증가 시키므로(Mendleson, 1946) 뇌동맥류 파열 방지를 위하여 혈역학적 변화를 최소화하는 것은 중요하다. Sevoflurane을 사용한 마취유도 시 적정농도는 2.5% (1.5 MAC)이라고 알려져 있으며 이 농도에서는 기도삽관에 의한 고혈압과 빈맥의 빈도는 줄일 수 있으나, 심한 저혈압을 초래할 수 있다. 뇌동맥류 환자 마취 …
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