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Dissertations / Theses on the topic 'Sessile Drops'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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1

Baughman, Kyle. "Deposition of Bacteria from Sessile Drops." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194109.

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This dissertation reports on the discovery of a new method of patterning bacteria (Pseudomonas aeruginosa PAO1) on a surface using a drying sessile drop. This work identifies bacterial suspension age and the length of time mica is exposed to the laboratory atmosphere as the key parameters which impact the behavior of the sessile drop and the resulting residue. Possible origins of mica aging and bacterial suspension aging are discussed in light of the literature and the experimental conditions. The residue area and the fraction of the residue area on which substantial bacteria and salt depos
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2

Bou-Zeid, Wassim. "Wettability and evaporation of sessile drops of biological fluids." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4348/document.

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Le processus d'étalement et d'évaporation d'une goutte de suspensions de particules sur une surface solide est très intéressant permettant la formation de motifs. Une étude expérimentale à été effectuée avec du sang total humain et avec des fluides purs dans une chambre sous atmosphère contrôlée en humidité relative. Pour des angles de contact faible, le processus d'étalement/évaporation peut être divisé en deux régimes. Un premier régime rapide gouverné par un équilibre entre les forces visqueuses et les forces capillaires et un deuxième régime plus lent dominé par la cinétique d'évaporation.
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3

Zhang, Ying. "Coalescence of Sessile Drops: the Role of Gravity, Interfacial Tension and Surface Wettability." Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/994.

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Coalescence of liquid drops is important in many natural and industrial processes, such as raining, inkjet printing and coating applications. The coalescence for sessile drops is more complicated due to the additional interplay between the drops and solid surface. This work examines the impact of gravity, interfacial tensions and wetting properties on both the static and dynamic aspects of the coalescence of sessile drops. In the presence of gravity, seven dimensionless parameters are identified to describe the axisymmetric configuration of a compound sessile drop after coalescence. A stabilit
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4

Carle, Florian. "Flow motion in sessile droplets : evaporation and nanoparticles assembly." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4726/document.

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L'évaporation d'une goutte reposant sur un support plat semble être un système relativement simple à étudier et a fait l'objet d'études scientifiques depuis plus d'un siècle. Cependant, l'étude de l'évaporation de gouttes sessiles est toujours d'actualité aujourd'hui avec l'essor de nouvelles techniques de visualisation ou de l'apparition de nouveaux types de fluides complexes.Cette étude expérimentale sera focalisée sur deux aspects distincts :- L'étude sur l'évaporation de fluides purs permettra d'étudier la dynamique d'évaporation et les ondes hydrothermales qui apparaissent d
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5

Sartori, Paolo. "The Role of Interfaces in Microfluidic Systems: Oscillating Sessile Droplets and Confined Bacterial Suspensions." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3423250.

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This PhD thesis is focused on the role of interfaces that characterize microfluidic systems, such as the free air/liquid interface of drops or the liquid/solid interface of fluids enclosed in microchannels. This work has a twofold character: on one side, we studied the dynamics of sessile drops subject to oscillations of the substrate; on the other, we investigated the spatial concentration distribution of suspensions of motile bacteria, as a model system for active collids, tuned by geometrical confinement. Dynamics of sessile drops. The first topic is related to the field of wetting pheno
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6

Robson, Alyssa A. "Surface Tension Measurements of Various Surfactants Using the Constrained Sessile Drop Method." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1398819754.

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7

Bahramian, Anohe. "Evaluating surface energy components of asphalt binders using Wilhelmy Plate and Sessile Drop Techniques." Thesis, KTH, Väg- och banteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117463.

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In this Study, the surface energy was investigated for six penetration grade 70/100 bitumen binders. Wilhelmy Plate and the Sessile Drop were used to determine the contact angles. The purpose of this study was to compare the Wilhelmy Plate method with the Sessile Drop method, and to compare the significance of Owens-Wendt model with the significance of Acid Base model by correlating surface energy components. Better R2 –values were found for surface energy components by using the Owens-Wendt model than by using the Acid Base model. It was concluded here that Owens-Wendt model is a better model
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8

Hamuyuni, Joseph. "Measurement of surface tension in base metal sulphide mattes by an improved sessile drop method." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71651.

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9

Abusaksaka, Abdulgadir Ahmed. "Structuration et défauts de surface et de volume lors du séchage de suspensions colloïdales." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI089/document.

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La maîtrise de la fabrication de films de suspension colloïdale par évaporation constitueencore à ce jour, un véritable verrou scientifique pour l’élaboration des matériaux. Le séchage desuspensions colloïdales entraine souvent des défauts de surface et de volume dans le film. Lorsque lesparticules sont molles, les films sont continus mais présentent des défauts de plissement de surface.Lorsque les particules sont dures (latex vitreux, silice..), le film se fissure et se délamine. Ces défautssont souvent liés aux contraintes résiduelles dans le gel à la fin du séchage qui sont dues à la pressi
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10

Singh, Sandeep. "Thermo-mechanical Behavior of Glass Based Seals for Solid Oxide Fuel Cells." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1288379341.

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11

Mišáková, Liliana. "Měření povrchového napětí pro charakterizaci povrchů pokročilých keramických materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432866.

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Povrchy inorganických materiálov, zvlášť kovov alebo kovových oxidov, ktoré sú často charakteristické vysokou povrchovou energiou, sú zvyčajne kontaminované adsorbovanými organickými molekulami. Tieto molekuly majú na povrchy zväčša nepriaznivý vplyv, do značnej miery napríklad ovplyvňujú funkcionalitu a výkonnosť polovodičov a znemožňujú, prípadne sťažujú prevedenie povrchových úprav na povrchoch kovov aj keramík. Taktiež majú nepriaznivý vplyv na priľnavosť. Adsorbované častice spôsobujú znižovanie hydrofilicity povrchu. Hydrofilicita, adhezivita a zmáčavosť povrchu sa veľmi dobre posudzujú
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12

Jacquot, Francis. "Contributions expérimentale et théorique à une nouvelle approche de la mouillabilité." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL056N.

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L’objectif de ce travail, qui s'inscrit dans le cadre d'une équipe de modélisation mathématique, consiste à caractériser les paramètres susceptibles de définir les propriétés de mouillabilité d'un liquide (environné d'un autre fluide) sur la surface d'un solide. Cette étude, essentiellement expérimentale, s'est concentrée sur le cas d'une goutte sessile posée. Elle s'est attachée à déterminer une relation entre l'aire de base d'une telle goutte et de son volume, lorsque l'on fait évoluer ce dernier dans une situation quasi-statique, engendrant ainsi un hystérésis. Pour cela, nous décrivons dan
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13

Sobac, Benjamin. "Evaporation de gouttes sessiles : des fluides purs aux fluides complexes." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4801/document.

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Cette thèse présente une étude expérimentale sur l'évaporation de gouttes reposant sur un substrat solide. Dans une première partie, nous nous sommes intéressés à la description de l'évaporation d'une goutte liquide en regardant notamment l'influence du substrat. Le problème est approché sous un angle nouveau : en contrôlant avec précision les différentes propriétés du substrat que sont sa rugosité, son énergie de surface et ses propriétés thermiques. Cette méthode a permis de découpler les différentes influences du substrat et d'étudier l'évaporation pour différentes dynamiques de ligne tripl
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14

DOEDENS, MARIEKEN. "How to take care of your rainwear, An evaluation of commercially available laundry and waterproofing agents and their effect on maintaining water-repellence." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17415.

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Breathable water-repellent garments are common products on the outdoor market. There are many recommendations on how to wash and waterproof your garment in order to make sure that its water-repellence is cared for, but the advice given by different sources is inconsistent. Are expensive products really necessarily or are regular laundry products just as good? What waterproofing agents should one use in order to insure that the water-repellent layer is restored? Four different water-repellent wash-in products were tested on polyester and polyamide fabrics. Seven laundry products and two water-r
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15

Nair, Sithara. "Novel Fluorous Hybrid Surface Modification Characterized by Wetting Dynamics, Morphology and Nanomechanics." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/446.

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The surface response of a polymer substrate to external stimuli such as initial wetting is controlled by the outermost molecular layer. Thus, changes on the nanoscale may be engaged to control macroscale wetting behavior. Our work has predominantly focused on surface modification of conventional polyurethane coatings (HMDI-BD-PTMO). Studies on network constrained phase separation and facile polydimethylsiloxane surface functionalization led to the discovery of a simpler one-step and more general approach to functional polymer surfaces that we have designated as “Bottle-Brush Nanoglass” (BB-NG)
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16

Dominguese, David J. "A Single Session of Repeated Wingate Anaerobic Test Caused Alterations in Peak Ground Reaction Force During Drop Landings." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1268328477.

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17

Ramos, Masana Ana. "Estudio de la reactividad a alta temperatura de aleaciones ligeras sobre recubrimientos cerámicos." Doctoral thesis, Universitat Ramon Llull, 2020. http://hdl.handle.net/10803/669953.

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La interacció entre metalls fosos i les superfícies de materials ceràmics o metàl·lics és protagonista en diversos processos de fabricació, com ara la injecció d'aliatges lleugers, la foneria de ferro o la síntesi de materials compostos metall-ceràmics (MMC, Metall Matrix Composites). Aquesta interacció es tradueix en un fenomen de mullat en major o menor mesura de la superfície, fet que es pot modular mitjançant l'aplicació de tractaments superficials. El procés d'injecció d'aliatges d'alumini és probablement un dels processos amb metalls fosos amb més impacte industrial. En el present treb
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18

Muhmood, Luckman. "Investigations of thermophysical properties of slags with focus on slag-metal interface." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26611.

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The objective of this research work was to develop a methodology for experimentally estimating the interfacial properties at slag-metal interfaces. From previous experiments carried out in the division, it was decided to use surface active elements like sulfur or oxygen to trace any motion at the interface. For this purpose the following experimental investigations were carried out. Firstly the density of slag was estimated using the Archimedes Principle and the Sessile Drop technique. The density of the slag would give the molten slag height required for the surface active element to travel b
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19

Горєлов, В. О. "Розробка удосконалених методик і приладу для вимірювання поверхневого натягу рідин і розчинів методом лежачої краплі". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2003. http://elar.nung.edu.ua/handle/123456789/3981.

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Дисертація присвячена дослідженню і розробці методик вимірювання поверхневого натягу рідин та їхніх розчинів на межі контакту рідина-оточуюче повітря. Проаналізовано відомі методики і прилади для вимірювання поверхневого натягу рідин та їхніх розчинів методом лежачої краплі. Визначено їхні недоліки, проведено оцінку умов проведення вимірювання поверхневого натягу методом лежачої краплі.<br>Диссертация посвящена разработке методик измерения поверхностного натяжения жидкостей и растворов на границе раздела жидкость - окружающий газ воздух, разработке математического описания формирования лежащей
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20

Lorrain, Vincent. "Influence des proprietes capillaires sur la corrosion du tungstene par des metaux liquides." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0099.

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Nous etudions les phenomenes de mouillage, d'infiltration capillaire et de penetration intergranulaire de depots de tungstene projetes plasma par l'alliage eutectique u-fe sous vide secondaire. Les principaux parametres explores sont la microstructure du tungstene, la chimie de surface du tungstene et la duree des essais. Des essais de goutte posee realises dans les systemes cu/w et cu-ag/w nous ont permis de qualifier, in situ, la chimie de surface des substrats. Nous montrons que l'infiltration du w projete plasma par le cuivre liquide depend de facon critique de la chimie de surface des par
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21

Cao, Weimin. "Theoretical and experimental studies of surface and interfacial phenomena involving steel surfaces." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26194.

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The present work was initiated to investigate the surface- and interfacial phenomena for iron and slag/iron systems. The aim was to understand the mechanism of the effect of surface active elements on surface and interfacial properties. In the present work, the adsorption of oxygen and sulfur on iron surface as well as adatom surface movements were studied based on the ab initio method. BCC iron melting phenomena and sulfur diffusion in molten iron were investigated by Monte Carlo simulations. The impact of oxygen potential on interfacial mass transfer was carried out by X-ray sessile drop met
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22

Landry, Karine. "Contribution à l'étude du mouillage réactif : étude du système aluminium/carbone." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0043.

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La cinetique de mouillage et sa relation avec la reactivite interfaciale ont ete etudiees pour le systeme aluminium liquide/carbone en fonction des parametres suivants: temperature (entre 1000 et 1250 k), ordre microstructural des substrats de carbone et concentration en elements carburogenes (silicium, titane) dans l'aluminium. Le mouillage a ete etudie par la technique de la goutte posee. Le controle de l'etat de surface des substrats et la caracterisation des produits des reactions interfaciales ont ete realises par les techniques suivantes: microscopie electronique a balayage, microsonde e
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23

Dallel, Dorra. "Etude expérimentale modèle de l'imbibition capillaire de substrats poreux à volume et structure de pores ajustables." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-00870951.

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L'imbibition est d'une importance fondamentale dans de nombreuses applications technologiques et intervient par ailleurs dans de nombreux phénomènes naturels (industrie textile, industrie pharmaceutique, érosion des sols ....). Malgré l'importance de ce phénomène, la description et la modélisation des mécanismes d'imbibition sont encore sujettes à discussion dans la littérature, en particulier, la prédiction des cinétiques d'imbibition à partir de la connaissance de la topographie du milieu poreux. L'objectif de ce travail de thèse a été de relier les cinétiques d'imbibition à la structure du
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24

Cook, Grant O. III. "Joining Polycrystalline Cubic Boron Nitride and Tungsten Carbide by Partial Transient Liquid Phase Bonding." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2366.

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Friction stir welding (FSW) of steel is often performed with an insert made of polycrystalline cubic boron nitride (PCBN). Specifically, MS80 is a grade of PCBN made by Smith MegaDiamond that has been optimized for the FSW process. The PCBN insert is attached to a tungsten carbide (WC) shank by a compression fitting. However, FSW tools manufactured by this method inevitably fail by fracture in the PCBN. Permanently bonding PCBN to WC would likely solve the fracturing problem and increase the life of PCBN FSW tools to be economically viable. Partial transient liquid phase (PTLP) bonding, a proc
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25

Shyam, Sunder *. "Dynamics of Bubbles and Drops in the Presence of an Electric Field." Thesis, 2015. http://etd.iisc.ernet.in/2005/3833.

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The present thesis deals with two-phase electrohydrodynamic simulations of bubble and droplet dynamics under externally applied electric fields. We used the Coupled Level-Set and Volume-of-fluid method (CLSVOF) and two different electrohydrody-namic formulations to study the process of bubble and drop formation from orifices and needles, the interactions of two conducting drops immersed in a dielectric medium, and the oscillations of sessile drops under two different ways of applying external elec-tric field. For the process of bubble formation in dielectric liquids due to the injection of ai
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26

Liu, Jung-Yu, and 劉鎔瑜. "Solidification of Resonating Sessile Drop." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ygm3j4.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>107<br>This research is trying to find out the influence of the acceleration and the frequency of a sessile resonating drop. Also, this research is trying to maintain the resonance shape of the drop by using cold fluid to freeze it. The experimental fluid is gallium. We used aLED halo as the lighting method. From the reflection of the halo on the surface of the drop, we could tell the shape of the resonating drop. In this research, we found 16 modes which had been found before, including 7 sectoral modes, 4 zonal modes and 5 tesseral modes. In addition to these 16 m
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Shrikanth, V. "A Non Resonant Piezoelectric Sensor for Mass, Force and Stiffness Measurements." Thesis, 2015. http://etd.iisc.ernet.in/2005/4000.

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The word piezo in greek means \to compress". Piezoelectric sensors work on the principle of direct piezoelectric effect, where a mechanical input generates a corresponding electric charge. The advantages of these sensors are wide fre-quency range of operation, high stiffness and small size. The main limitation of a piezoelectric sensor is that it cannot be used in measurements that are truly static. When a piezoelectric sensor is subjected to a static force, a fixed amount of charge is developed which would eventually decay at a rate dependent on the external impedance of the sensor circuitry.
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Chuang, Yu-Chen, and 莊于真. "Sessile Drop Evaporation and Wetting Phenomena on Patterned Surfaces." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01139451371467471875.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>101<br>There are two topics discussed in this study: water evaporation on soft patterned surfaces and the observation of the Cassie impregnating wetting state. First, we demonstrate the evaporation mechanism of water sessile drop on different softness of fixed patterned PDMS (polydimethylsiloxane) substrate and also compare the results from the viewing angle of 0° with that from the viewing angle of 45°. The evaporation mechanism generally starts from the constant contact radius mode and turns into constant contact angle mode when the receding contact angle is reach
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Lai, Ting-Yin, and 賴亭吟. "Contact Angle Measurement from analysis of Sessile Drop Shapes." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/25754377237830749116.

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碩士<br>國立中正大學<br>化學工程所<br>95<br>In contact angle measurement from analysis of sessile drop shapes, the quality of drop images and the analysis of drop shapes determine accuracy of the contact angle. High quality drop images should have large contrast in brightness at the edges. We improved the image quality by adjusting the elements of the homemade contact angle goniometer, and found a better technique for contact angle measurement. Then we determined the drop edges consistant with the real image by gradient method and analyzed the drop shape by circle fitting. Contact angle can be obtained fro
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ELDER, JAMES EDWARD. "INTERFACIAL TENSION MEASUREMENT BY SESSILE DROP USING DIGITAL IMAGE PROCESSING." Thesis, 1987. http://hdl.handle.net/1911/13216.

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In enhanced oil recovery the displacement of oil is most effective at low interfacial tensions, usuall below 10$\sp{-2}$ dyne/cm. This condition can be achieved by surfactant or chemical flooding but requires accurate modeling of reservoir conditions and determination of interfacial tensions, IFTs. The spinning drop technique is very popular but the sessile drop method offers the advantage that it is a static system. Most previous systems required a photograph to be taken and analysis was limited to key coordinates along the profile. A sessile drop system has been designed which allows drops o
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Gitiafroz, Roya. "Study of surface tension of pulmonary surfactant using a constrained sessile drop technique." 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370093&T=F.

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32

Yan, Shi-Liang, and 顏世良. "Effects of Contact Line Retraction Velocity to Receding Contact Angle by Sessile Drop Method." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/52329205883811419530.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>104<br>This experiment shows the influence of triple line retraction velocity on receding contact angle by using sessile drop method. The experiment was performed by dropping the liquid drops on polymer PMMA (polymethyl methacrylate) and PC (poly carbonate) substrates. The suction process was then performed to reduce the droplet volume by pumping out the liquid drop using syringe pump and needle. It was found that the contact angle change when the de-wetting velocity increase. From the experimental results, we can observe there are three stages: constant contact radi
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33

Lin, Chia-Hui, and 林佳慧. "A Study on the Adsorption Kinetics of Ionic Surfactants and Evaporation Behavior of Sessile Drop." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/00295750801500237472.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>102<br>The dynamic and equilibrium surface tensions for the adsorption of anionic surfactant AOT and cationic surfactant DDA in aqueous solutions onto a clean air-water interface was measured by using a video-enhanced pendant bubble tensionmeter. A comparison between the nonionic and ionic models (Langmuir, Frumkin and generalized Frumkin models) and the equilibrium and dynamic surface tensions of AOT and DDA were performed in order to study the adsorption mechanism and to determine the diffusivity of surfactant molecules. The adsoprion kinetics for AOT in aqueous 50
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Pan, Sih-Ting, and 潘姒婷. "Study of Mirror-Electrowetting-on-Dielectric by the Sessile Drop Method for Applications of Parallel Droplets Manipulation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/81741481851864408886.

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碩士<br>國立交通大學<br>奈米科技研究所<br>97<br>EWOD (Electrowetting-on-dielectric) is a method to change the surface wettability on top of an electrode. This phenomenon is reversible and consumes very low power. MEWOD (Mirror-EWOD) is occurred when we replace solid electrode with liquid electrode, and the size of the liquid electrode is shrunk to a comparable volume of the upper droplet. Electrowetting was found on both sides of the dielectric film and the mirror-EWOD force would bring the overlapped droplets to each other. In this thesis, we analyze the phenomenon of MEWOD and put the device into silicone
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35

Chao, Kuo-Lin, and 趙國霖. "Surface Tension Measurement of Liquid Fe-Si-B and Fe-16Cr-2Co-Mn-Mo-N alloys by Sessile Drop method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63320841903274992153.

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博士<br>國立臺灣大學<br>材料科學與工程學研究所<br>102<br>The purpose of this study is to investigate the high temperature contact angle and surface tension under various components of the refractories for Fe-Si-B alloys and Fe-16Cr-2Co-Mn-Mo-N high nitrogen stainless steels. The high temperature contact angle and surface tension are measured by Sessile Drop Method in this study. According to Bashforth and Adams equation, the accurate measurement of the contour droplet size and density will affect the measurement results of its surface tension. The surface tension of pure silver is measured and compare with liter
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Lin, Chen-Han, and 林承翰. "A study of motions of a sessile water drop on a switchable surface via liquid crystal molecular orientations under influence of morphologies." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3xvu33.

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