Read Online Polymer adsorption on a fractal substrate: numerical study. - V Blavatska Affiliation: Institut für Theoretische Physik and Centre for Theoretical Sciences, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany. viktoria@icmp.lviv.ua; W Janke | ePub
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The adsorbed polymers are characterized by density and orientation profiles, adsorbed fraction and chain topologies.
Polymer adsorption on fractally rough walls of varying dimensionality is studied by renormalization group methods on hierarchical lattices. The adsorption transition is found continuous for low dimension dw of the adsorbing wall and the corresponding crossover exponent φ monotonically increases with dw, eventually overcoming previously conjectured bounds.
The higher fractal dimension of kfi-polyvinyl acetate mmm, compared to rho-polyvinyl acetate.
Polymer coatings are applied to devices to increase their hemocompatability. By choosing to use hydrophilic polymer coatings, protein adsorption decreases and the chance of negative interactions with the blood diminishes as well.
The strong π–π interaction between the benzene and naphthalene moiety of the polymer is responsible for the adsorption. Surface analysis of cpcmeri-1 before and after adsorption of benzene has been investigated which depicts the surface adsorption phenomena of the analyte. The interaction has been further examined by using dft-d3 study.
Showed that entropy penalty for chain adsorption on fractal surfaces was highly influenced by chain length and fractal dimension. Studied the adsorption of a polymer on a surface with small-scale, gaussian-correlated undulations using a variational method. They found that the adsorption temperature was lowered, due to reduction in entropic penalties.
Abstract: polymer adsorption on fractally rough walls of varying dimensionality is studied by renormalization group methods on hierarchical lattices.
Aug 14, 2020 this paper suggests a fractal two-phase fluid model for the polymer melt filling process to deal effectively with the unsmooth front interface.
X-ray diffraction has been performed to determine the crystallinity while the voltage-time measurement has been done to validate the aggregation process. Effect of air exposure/oxidation on the growth patterns has also been considered as the adsorption of oxygen ions changes with the change in the crystallinity of the polymer.
Jan 29, 2007 following two different protocols dna knots are adsorbed onto a mica surface in (ii) from a polymer physics interest, and to understand.
Fractals in surface science: scattering and thermodynamics of adsorbed films the fractal approach to the chemistry of disordered systems: polymers,.
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Abstract in many cases, polymer adsorption is studied by measuring adsorption isotherms. Quite often it is found that the results are at variance with theoretical.
Adsorption is the adhesion of ions or molecules onto the surface of another phase.
The saturation and evolution of the adsorption zone is the same as with activated carbon. In other words, their adsorption capacity rises in proportion to the partial pressure of the voc in flue gases.
Sively related to size, such as adsorption or partition (or both) because of binary interactions polymer molar mass averages using a fractal.
The adsorption experiments were then started by exchanging the buffer with the polymer solution. Qsoft software (q-sense ab, västra frölunda, sweden) was utilized to record the changes in the properties of the adsorbed polymer layer at four different.
The values of the surface fractal dimensions for the parental support and the samples with varying polymer loading have been obtained from low-temperature nitrogen adsorption isotherms using the thermodynamic method. The increase of polymer content does not have a significant impact on the surface properties.
Polymer adsorption on a fractal substrate: numerical study viktoria blavatsk a 1, 2, ∗ and w olfhard janke 1 † 1 institut f¨ ur theor etische physik and centre for theor etical scienc es (ntz),.
Abstract: scaling aspects are of common occurrence in polymer science.
We study the surface adsorption and collapse transition of a flexible self-attracting self-avoiding polymer chain on truncated 4- and 5-simplex lattices using real-space renormalization-group techniques. We find phase diagrams that exhibit many different universality domains of critical behavior. In the desorbed ordinary bulk regime, the polymer undergoes a collapse transition from a swollen.
1998-07-01 00:00:00 the adsorption of a single ideal polymer chain on energetically heterogeneous and rough surfaces is investigated using a variational procedure introduced by garel and orland (phys. The mean polymer size is calculated perpendicular and parallel to the surface and is compared to the gaussian conformation and to the results for polymers at flat and energetically homogeneous surfaces.
I rock lithology, ii brine composition and iii wettability. Besides confirming the role of electrostatics in the adsorption process, the results obtained highlight the importance of clays and show that matching polymer and rock surface charges is not always necessary to obtain a signifi-cant polymer adsorption.
Abstract - the fractal dimension was evaluated on the bases of the experimental results on the adsorption of nitrogen, phenol, aerosol ot, ctab and narrow fractions of polymers (polyethylene glycole and dextranes). The fractal dimension dependences on the oxidation duration were considered for two samples of carbon black.
The purpose of this review is to demonstrate that there are well established molecular bonding and strong interactions between monomers or polymers and metals. We discuss both theoretical and experimental work related to adsorption and adhesion at polymer-metal interphases. Firstly, we briefly describe the fractal nature of polymer-metal interphases, and the effect of chemisorption on fractal dimension.
The adsorption capacity for nickel, mercury, and barium removal at 25 °c (single component) was 147, 107, and 64 (mg/g), respectively. However, the total adsorption capacity for the multi-component was 204 mg/g. A thermodynamic study was also done, and the values of δg 0, δh 0, and δs 0 were evaluated.
Adsorption of molecules onto polymer surfaces is central to a number of applications, including development of non-stick coatings and in various biomedical devices. Polymers may also be adsorbed to surfaces through polyelectrolyte adsorption.
The results obtained by means of static adsorption tests show that the adsorption is dominated by the nanoclay and nanosilica between the polymer molecules and the solid surface. These results also show that lithology, brine concentration and polymer viscosity are critical parameters influencing the adsorption behavior at a rock interface.
Adsorption is the adhesion of ions or molecules onto the surface of another phase. Ions and molecules can adsorb to many types of surfaces including polymer surfaces.
The absorption capacity and selectivity of the imprinted polymer for copper ion were determined in the presence of various competitive metal ions. As results, adsorption equilibrium was quickly achieved in about 10 min with high absorbability (about 90%).
The unified equation can be substi- tuted for the debye equation in the rpa ( random phase approximation) description of polymer blends when the mass- fractal.
Request pdf formation damage mitigation mechanism for coalbed methane wells via refracturing with fuzzy-ball fluid as temporary blocking agents during drainage and production from coalbed.
Adsorption of semi-dilute polymer solutions on fractal colloidal grains.
Fractal dimension d was obtained from the nitrogen adsorption data using the fractal frenkel-halsey-hill (fhh) model.
Aug 1, 1993 in the adsorbed region, on a 4-simplex lattice, the polymer remains in the of a linear polymer chain: some exact results on fractal lattices.
Because of the short-range nature of the adsorption interactions and the low number of the polymer’s repeating units involved, the fraction of the chain segments strongly influenced by the surface is small. Therefore, a direct experimental investigation of polymer chains at the surfaces is, in practice, rather limited.
Polymer adsorption is the adhesion of the polymer molecules onto the rock surface. Because eor polymers have high molecular weights and extended chains, many polar groups along the polymer chain will attach to many different polar points on the rock surface. Consequently for practical purposes, polymer adsorption is irreversible (lee and fuller.
Many works have been published dealing with the modelling of polymer adsorption (vilgis 2000), with fractals, percolation threshold, cellular automata and other modern theories being applied successfully for solving the problem (balberg 2002; cates 1985; wessling 1996). From the prac-tical point of view, studies of the adsorption of polymers are especially relevant in biochemistry.
The adsorption capacity of polymer on the adsorbent, (mg/g), was calculated by a mass balance relation where and are the initial and equilibrium concentrations of polymer solutions (mg/g), respectively, is the volume of the polymer solution (l), and is the weight of the sand particles (g) (adsorbent) used.
Polymer adsorption in the flow of polymer solutions through porous media is usually accompanied by a variety of additional complex phenomena. Viscoelasticity has been shown to contribute to increased flow resistance, particularly at high flow velocities.
Several studies have examined the adsorption of polyacrylamides on the surface of kaolinite, standing out as the main flocculants and most common clay that appear in the copper industry. It has been concluded that polymer adsorption occurs mostly on the kaolinite edge,.
We shall consider adsorption onto both spherical and cylindrical col-loidal particles in good and theta solvents. The colloidal surface is less accessible to the polymer than is a flat surface so that the chain must deform more to achieve the same degree of adsorption.
Pom@mof fractal crystallites possess an ordered layered surface and meso- 2department of polymer science, the university of akron, akron this inference was further proved by adsorption experiments.
The theoretical fundamentals of macromolecules fractal analysis. It then goes on to discuss the fractal physics of polymer solutions and the fractal physics of melts. The intended audience of the book includes specialists in chemistry and physics of polymer synthesis and those in the field of polymers and polymer composites processing.
Adsorption on fractal substrates will open up a new regime of structural most fractal aggregates, clusters and polymers have the status of curves (branched.
That entropy penalty for chain adsorption on fractal and surfaces was highly influenced by chain length fractal dimension. [39] studied the adsorption of a polymer on a with small-scale, gaussian-correlated undulations using a variational method. They found that the adsorp-tion temperature lowered, due reduction in entro-pic penalties.
Fractal dimension do not depend strongly on potential it is appropriate to begin a study of the polymer-characteristics. The number of segments adsorbed, surface interaction by considering the bonding of a single however, does depend on the potential characteristics; chain to an adsorbing surface.
We present the exact results for critical exponents at the point of adsorption transition for polymer chains situated on a class of sierpinski gasket-type fractals. We provide numerical evidence for a critical behavior of the type found recently in the case of bulk self-avoiding random walks at the fractal to euclidean crossover.
Polymer adsorption on fractally rough walls of varying dimensionality is studied by renormalization group methods on hierarchical lattices. The adsorption transition is found continuous for low dimension $d_w$ of the adsorbing wall and the corresponding crossover exponent $\phi$ monotonically increases with $d_w$, eventually overcoming previously conjectured bounds.
Abstract: we study the adsorption of an a-b diblock copolymer from a dilute solution onto polymer adsorption and electron binding on rough and fractal.
The adsorption and dynamics of a polymer chain on a stripe-patterned surface composed of periodical attractive and neutral stripes are studied by using monte carlo simulation. The critical adsorption temperature t c and pattern-recognition temperature t r are estimated from the desorption probability, surface contact number, and bridge number.
Dec 4, 2006 in fractal containers that belong to the three-dimensional sierpinski gasket (3d sg) family of fractals, with a surface-adsorbed linear polymer.
The adsorption of polyvinylpyrrolidone over the surface of silica has been investigated. The impact of molar mass of the polymer, ph, and pretreatment temperature of silica particles have been evaluated by means of ftir spectroscopy and electrophoretic measurements. The silica particles used have narrow particle size distribution.
May 3, 2016 the surface fractal dimension d is a measure that indicates the amount that a on water adsorption data, if the latter is corrected using the surface fractal dimension of the insoluble cloud nucleus.
Abstract: we study the adsorption of a semidilute polymer solution on small colloidal grains with a fractal surface of dimension d (5/3 d 3) focusing on the concentration profile around the grain and on the adsorbance which is the total number of monomers belonging to adsorbed chains. On large grains (flat surfaces) the concentration profile is self-similar.
With polymers on the other hand, the formation of 2d fractals has been reported, 2d fractals has entailed either crystallization, adsorption, or self-assembly.
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