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You searched for subject:(Soft interaction potential). Showing records 1 – 2 of 2 total matches.

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Georgia Tech

1. Debord, Saet Byul. Phase Behavior of Multiresponsive Microgel Dispersions.

Degree: PhD, Chemistry and Biochemistry, 2005, Georgia Tech

We present the phase behavior of soft sphere colloidal dispersions. The pH responsive and thermoresponsive microgels, poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc), were used as a new building block of colloidal crystals. The phase behavior of microgel dispersions was studied by different methods such as optical microscopy, particle trajectories, mean squared displacement (MSD) vs. lag time plots and radial distribution function. The results show that the phase of the sample relies on the particle concentration for dispersions of the same pH. As the pH approaches the pKa of microgels, the microgel dispersions show unusual crystalline phase at lower effective volume fraction than hard sphere melting transition. Also, at this pH regime, the microgel dispersions undergo slow and spatially heterogeneous crystal growth. The cooperative multi-body type attractive forces were proposed to explain the unusual stability at low effective volume fraction. Ion-dipole interactions were proposed to be the origin of the attractive forces. The melting point of bulk crystals at this pH regime is much higher than the volume phase transition temperature of the building block. These results are supportive of the attractive forces hypothesis. Advisors/Committee Members: L. Andrew Lyon (Committee Chair), Marcus Weck (Committee Member), Mohan Srinivasarao (Committee Member), Thomas Orlando (Committee Member), Victor Breedveld (Committee Member).

Subjects/Keywords: Effective volume fraction; Attractive interacion; Soft interaction potential; Microgel dispersions; Phase behavior

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APA (6th Edition):

Debord, S. B. (2005). Phase Behavior of Multiresponsive Microgel Dispersions. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/10458

Chicago Manual of Style (16th Edition):

Debord, Saet Byul. “Phase Behavior of Multiresponsive Microgel Dispersions.” 2005. Doctoral Dissertation, Georgia Tech. Accessed January 21, 2021. http://hdl.handle.net/1853/10458.

MLA Handbook (7th Edition):

Debord, Saet Byul. “Phase Behavior of Multiresponsive Microgel Dispersions.” 2005. Web. 21 Jan 2021.

Vancouver:

Debord SB. Phase Behavior of Multiresponsive Microgel Dispersions. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Jan 21]. Available from: http://hdl.handle.net/1853/10458.

Council of Science Editors:

Debord SB. Phase Behavior of Multiresponsive Microgel Dispersions. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/10458

2. Chubak, Iurii. Interfacial behavior of ring polymer solutions on planar, hard walls.

Degree: 2017, University of Vienna

Ziel dieser Masterarbeit ist die Bestimmung der Depletionswechselwirkung zwischen zwei planaren, harten Wänden, die in einer Ringpolymerlösung eingetaucht sind. Am Anfang haben wir das effektive Wechselwirkungspotential zwischen den Massenmittelpunkten der flexiblen, unverknoteten Ringpolymeren und der harten Wand berechnet. Dieses Potential nimmt eine universelle Form im Skalierungslimes für Werte des Polymerisationsgrads der Ringen im Bereich mit N > 200 an. Überdies kann es in diesem Limes durch ein Yukawa-Potential in der Nähe der Wand und eine Gaußfunktion für Abstände, die größer als die Gyrationsradius der Ringen sind, beschrieben werden. Danach modellieren wir die ringförmigen Polymeren als weiche, penetrierbare Kugeln und verwenden die Mittelfeld-Dichtefunktionaltheorie, um die Struktur der Ringpolymerlösungen, die in Kontakt mit einer harten Wand sind oder zwischen zwei Wänden eingesperrt sind, zu bestimmen. Als Endergebnis zeigen wir, dass das Depletionspotential zwischen zwei harten Wänden innerhalb des Geltungsbereichs des effekitven Modells über ein oszillierendes Verhalten, welches sich mit erhöhenden Konzentration der Ringen verstärkt, verfügt. Schließlich wird die Depletionswechselwirkung auch im Falle einer Linearpolymerlösung ausgerechnet, um ihren qualitativen Unterschied hervorzuheben.

In this thesis, we investigate the depletion interaction between two planar, hard walls immersed in a solution of ring polymers. As a first step, we derived an effective interaction potential between the centers of mass of flexible, unknotted ring polymers and the hard wall. This effective potential approaches the scaling limit for relatively big rings with the degree of polymerization N > 200. Moreover, in the scaling regime, it can be modeled as a repulsive Yukawa potential in the region close to the wall and as a Gaussian at a distance greater than the gyration radius of the rings. Adopting the coarse-grained description of ring polymers as ultrasoft, penetrable spheres, we apply the mean-field density functional theory to examine ring polymer solutions in contact with one hard wall and confined between two parallel, hard walls. As a result, we demonstrate that even within the range of applicability of the effective model, the depletion potential between two hard walls features an oscillatory behavior intensifying with increasing concentration of the rings. Finally, the obtained form of the depletion interaction is shown to be qualitatively different in comparison to the linear polymer case.

Subjects/Keywords: 33.60 Kondensierte Materie: Allgemeines; 33.69 Flüssigkeiten; Physik der weichen Materie / Soft Matter / Ring Polymere / Flexibilität / harte Wände / Coarse-Graining / effektive Wechselwirkung / effektives Potential / effektives Modell / Depletionswechselwirkung / Depletionskraft / Oberflächenspannung / Dichtefunktionaltheorie / Integralgleichungen / Selbstkonsistenz Gleichungen; soft matter physics / ring polymers / flexibility / hard walls / coarse-graining / effective interaction / effective potential / effective model / depletion interaction / depletion force / surface tension / density functional theory / integral equations / self-consistent equations

…x28;2.8) 2.2 Coarse-graining a binary mixture where the effective interaction potential… …effective interaction potential (2.9), despite the fact that its general structure… …interaction in this model can be described exactly by the Asakura-Oosawa pair potential [20… …interaction βU (z) as well as the effective pair potential βu(r) between the… …rα }) stands for the total potential energy of the mixture. Also, from this point… 

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Chubak, I. (2017). Interfacial behavior of ring polymer solutions on planar, hard walls. (Thesis). University of Vienna. Retrieved from http://othes.univie.ac.at/48171/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Chubak, Iurii. “Interfacial behavior of ring polymer solutions on planar, hard walls.” 2017. Thesis, University of Vienna. Accessed January 21, 2021. http://othes.univie.ac.at/48171/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Chubak, Iurii. “Interfacial behavior of ring polymer solutions on planar, hard walls.” 2017. Web. 21 Jan 2021.

Vancouver:

Chubak I. Interfacial behavior of ring polymer solutions on planar, hard walls. [Internet] [Thesis]. University of Vienna; 2017. [cited 2021 Jan 21]. Available from: http://othes.univie.ac.at/48171/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chubak I. Interfacial behavior of ring polymer solutions on planar, hard walls. [Thesis]. University of Vienna; 2017. Available from: http://othes.univie.ac.at/48171/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.