Relevant bibliographies by topics / Cationic polyelectrolytes

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Cationic polyelectrolytes'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Cationic polyelectrolytes.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Cationic polyelectrolytes"

1

Lakhbayeva, Zh A., R. S. Taubayeva, S. M. Tazhibayeva, A. A. Barany, and K. B. Musabekov. "Aggregation of Aqueous Kaolin Suspensions in the Presence of Cationic Polyelectrolytes, Anionic Polyelectrolytes and their Mixtures." Eurasian Chemico-Technological Journal 18, no. 2 (November 30, 2016): 117. http://dx.doi.org/10.18321/ectj432.

Full text
Abstract:
The influence of anionic, cationic synthetic polyelectrolytes and their mixtures on the aggregation of kaolin hydrosuspension has been studied by means of spectrophotometry, electrophoresis and dynamic light scattering (DLS). An enhancement of the flocculating property of the cationic polyelectrolyte FO 4650 in accordance with its consumption increases from 0.77 mg/g to 7.7 mg/g has been found. At these conditions the relative size of floccules (R) increases from 1.0 to 13.0. The increase of the flocculating property accordingly to the increasing charge of anionic polyelectrolyte is observed in mixtures of cationic and anionic polyelectrolytes. The time dependences of R in presence of the weakly charged cationic polyelectrolyte mixtures reach a plateau region. This can be associated with the formation of electrostatic contacts between the solid surface and the polymer mixtures, as well as with stabilizing equilibrium conformation of macromolecules. It has been found that mixtures of oppositely charged polyelectrolytes lead to more efficient aggregation of particles than individual polyelectrolytes. This process is enhanced by the introduction primarily of the cationic polyelectrolyte and then the anionic one (R = 6‒10). Use of the pre-formulated mixtures of polymers leads to the marked increase in degree of particle aggregation (R = 12). The reason is an interaction of kaolin particles with inter-polymer complex formed by electrostatic attraction of oppositely charged polyelectrolytes.
APA, Harvard, Vancouver, ISO, and other styles
2

Drăgan, Stela, G. Grigoriu, and I. Petrariu. "Cationic polyelectrolytes." Polymer Bulletin 27, no. 1 (October 1991): 17–24. http://dx.doi.org/10.1007/bf00296319.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Orlov, Y. N. "The impact of the of cationic polyelectrolyte polymerization degree in latexes coagulation dosage of synthetic emulsion rubbers." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 1 (July 18, 2019): 318–24. http://dx.doi.org/10.20914/2310-1202-2019-1-318-324.

Full text
Abstract:
The literature data on the parameters of coagulation of butadiene-styrene and butadiene-?-methyl styrene latexes by cationic polyelectrolytes in comparison with low-molecular ammonium compounds and nonionic polymers are discussed. The optimal dosage of cationic polyelectrolyte during coagulation of synthetic emulsion rubber latex stabilized by a combination of synthetic fatty acid Soaps and disproportionated rosin with a mixture of sodium salts of the oligomeric condensation product ?-naphthalenesulfonic acid with formaldehyde (Leukanol) is determined, ceteris paribus, by its degree of polymerization. The decrease in the optimum dosage during the transition from high molecular weight polyelectrolytes to the oligomers caused by decrease of the cationic and anionic groups ratio required for a complete binding Leukanol in the formation of oligomer-oligomer complexes compared with the polymer-oligomer complexes. This is due, apparently, the fact that an increase in the average molecular weight of the polyelectrolyte increases the proportion of so-called tails and loops, consisting of units of the polyelectrolyte that are not associated with molecules Leukanol
APA, Harvard, Vancouver, ISO, and other styles
4

Chen, Chao, Josefin Illergård, Lars Wågberg, and Monica Ek. "Effect of cationic polyelectrolytes in contact-active antibacterial layer-by-layer functionalization." Holzforschung 71, no. 7-8 (July 26, 2017): 649–58. http://dx.doi.org/10.1515/hf-2016-0184.

Full text
Abstract:
AbstractContact-active surfaces have been created by means of the layer-by-layer (LbL) modification technique, which is based on previous observations that cellulose fibers treated with polyelectrolyte multilayers with polyvinylamine (PVAm) are perfectly protected against bacteria. Several different cationic polyelectrolytes were applied, including PVAm, two different poly(diallyl dimethyl ammonium chloride) polymers and two different poly(allylamine hydrochloride) polymers. The polyelectrolytes were self-organized in one or three layers on cellulosic fibers in combination with polyacrylic acid by the LbL method, and their antibacterial activities were evaluated. The modified cellulose fibers showed remarkable bacterial removal activities and inhibited bacterial growth. It was shown that the interaction between bacteria and modified fibers is not merely a charge interaction because a certain degree of bacterial cell deformation was observed on the modified fiber surfaces. Charge properties of the modified fibers were determined based on polyelectrolyte titration and zeta potential measurements, and a correlation between high charge density and antibacterial efficiency was observed for the PVAm and PDADMAC samples. It was demonstrated that it is possible to achieve antibacterial effects by the surface modification of cellulosic fibers via the LbL technique with different cationic polyelectrolytes.
APA, Harvard, Vancouver, ISO, and other styles
5

Tan, Chunxia, Nijuan Liu, Bingran Yu, Cheng Zhang, Weifeng Bu, Xiuli Liu, and Yu-Fei Song. "Organic–inorganic hybrids formed by polyoxometalate-based surfactants with cationic polyelectrolytes and block copolymers." Journal of Materials Chemistry C 3, no. 11 (2015): 2450–54. http://dx.doi.org/10.1039/c4tc02971b.

Full text
Abstract:
Polyoxometalate-based polyelectrolyte–surfactant complexes and vesicles were fabricated by electrostatic self-assembly of an Anderson-based surfactant with polyelectrolytes and block copolymers, respectively.
APA, Harvard, Vancouver, ISO, and other styles
6

Agzamov, Farit, Arman Kabdushev, Abdulahat Ismailov, Aizhan Betzhanova, and Asel Karabaeva. "Polyelectrolytes Efficiency in Grout Property Regulation." Key Engineering Materials 771 (June 2018): 9–23. http://dx.doi.org/10.4028/www.scientific.net/kem.771.9.

Full text
Abstract:
Relevance of this study is concluded in the fact that high quality cementing requires regulation of the cement grouts’ properties using various chemicals. The objective of the work is based on the study of polyelectrolytes’ application efficiency used for regulation of cement slurries’ properties. In order to conduct the research the authors used the devices meeting the API requirements. Properties of cement slurry and cement were evaluated according to GOST 1581-96. In order to study the gas show emergence mechanism during the procedure of WOC (waiting on cement), the authors used a special experimental plant. It has been found that high efficiency during the research was shown by water soluble cationic polyelectrolyte (WSC-402), belonging to the class of cationic polymers. Also the paper considers its analog – cationic polyelectrolyte (PAK) released under the trade mark Praestol. Studying the mechanism of polyelectrolyte additives’ effect on cement showed that the chemicals can slow down the hydrating reaction of С3А in cement-water suspension, and prevent from the growth of gel strength of the grout, which causes drop in hydrostatic pressure of the cement grout column, provoking gas shows.
APA, Harvard, Vancouver, ISO, and other styles
7

Krupińska, Izabela. "Impact of Polyelectrolytes on the Effectiveness of Treatment of Groundwater with Increased Natural Organic Matter Content." Civil and Environmental Engineering Reports 28, no. 3 (September 1, 2018): 17–29. http://dx.doi.org/10.2478/ceer-2018-0032.

Full text
Abstract:
Abstract The article discusses effectiveness of treatment of groundwater with increased natural organic matter content with the use of organic polyelectrolytes. The effects of water treatments were determined by the ionic character of the polyelectrolyte and its dose. Due to the amount of removed general ferric and coloured matters a greater usefulness of anionic and non-ionic polyelectrolytes was shown, while due to decreased turbidity and TOC, cationic flocculants proved more useful. Using the Praestol 2540 semi-anionic polyelectrolyte as the substance aiding the coagulation process decreased the effectiveness of groundwater treatment, especially in terms of the removal of iron and organic substances when using the PIX-112 coagulating agent.
APA, Harvard, Vancouver, ISO, and other styles
8

Thapa, K. B., Y. Qi, and A. F. Hoadley. "Using FBRM to investigate the sewage sludge flocculation efficiency of cationic polyelectrolytes." Water Science and Technology 59, no. 3 (February 1, 2009): 583–93. http://dx.doi.org/10.2166/wst.2009.006.

Full text
Abstract:
Polyelectrolyte flocculation is a commonly used method for sewage sludge conditioning. The rate and extent of water removal from the flocculated sludge depends on the properties of the polyelectrolytes. This study investigates the flocculation performance of four different cationic polyelectrolytes using an in-situ laser probe which uses focused beam reflectance measurements (FBRM). It is used to characterise the floc number and size distribution of the flocculated sludge at various polyelectrolyte doses. Results show that the FBRM technique is very successful in tracking the change in particle population and chord lengths during the sludge flocculation process. The FBRM offers an alternative method for optimising the flocculation system in both selecting the flocculant and determining its optimum dose. Both the reduction in particle count for particles of less than 10 μm and the flocculation efficiency defined from the amount of the original sludge distribution remaining after flocculation correlate well with dewatering performance.
APA, Harvard, Vancouver, ISO, and other styles
9

Dragan, Stela, I. Dranca, Luminita Ghimici, Mariana Cristea, Gh Funduianu, and T. Lupascu. "Thermal behaviour of some cationic polyelectrolytes and polyelectrolyte complexes." European Polymer Journal 34, no. 5-6 (May 1998): 733–37. http://dx.doi.org/10.1016/s0014-3057(97)00189-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ghimici, Luminita, I. Dranca, Stela Dragan, T. Lupascu, and A. Maftuleac. "Hydrophobically modified cationic polyelectrolytes." European Polymer Journal 37, no. 2 (February 2001): 227–31. http://dx.doi.org/10.1016/s0014-3057(00)00101-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Cationic polyelectrolytes"

1

Reye, John Timothy. "Enhanced enzymatic hydrolysis of cellulosic fibers by cationic polyelectrolytes." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39633.

Full text
Abstract:
A new method for enhancing rates of enzymatic hydrolysis for cellulosic fiber is presented. By adding a cationic polyelectrolyte to a cellulase/cellulose hydrolytic system, the polyelectrolyte binds to the cellulase and fiber forming flocs. The cellulase is bound by a patching mechanism. By using this technique, the rate of enzymatic hydrolysis can be enhanced. This thesis covered observations made about the cellulase/cationic polyelectrolyte/fiber interactions. A mechanism was proposed based on the experimental results.
APA, Harvard, Vancouver, ISO, and other styles
2

Stephens, Brian Paul. "Cationic polyelectrolytes in coal water mixture formulations." Thesis, University of Huddersfield, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304690.

Full text
Abstract:
A novel range of cationic polyelectrolytes was assessed as potential 'additives for coal-water mixtures (CWMs). The anionic polyelectrolytes Lomar D and Borresperse NH were obtained to provide a comparison with the cationic compounds. Several typical UK coals were selected f~r CWM preparation giving variation in coal type and particle size distribution (PSD). The polyDADMAC (diallyl dimethyl ammonium chloride)-containing cationic polyelectrolytes were very good dispersants of powdered coal. An app~ratus was designed and assembled for the preparation of CWMs by the dry blending of coal and polyelectrolyte/water solution. In general CWMs containing cationic polyelectrolytes were more viscous and more stable than those containing anionic polyelectrolytes. In addition CWMs containing cationic polyelectrolytes did not have yield stresses. The most stable and less compacted CWMs contained either polyDADMAC (1) or polyDADMAC (P) (a peroxide treated polyDADMAC homopolymer). Adsorption studies of these cationic polyelectrolytes and the anionic polyelectrolytes on coal indicated that approximately twice more anionic than cationic polyelectrolyte was adsorbed at the plateau of the adsorption isotherms for these systems. The adsorption layer of the anionic polyelectrolytes probably lies flat on the coal surface forming a more complete monolayer. This leads to reduced CWM viscosity and rapid coal particle settlement. In contrast ~he cationic polyelectrolytes probably adsorb only partially with a large proportion of the polymer chains protruding into the aqueous phase. This leads to higher CWM viscosity and greater resistance to coal particle settlement. The rheological classification of CWMs used in this study was, in general, dilatant. It was found that CWM viscosity increased with dose level of polyelectrolyte. Throughout the rheological measurements, viscosity measurements and stability tests the cationic polyelectrolytes polyDADMAC (1) and polyDADMAC (P) performed better than either of the anionic polyelectrolytes as a single CWM additive. CWMs containing these polyDADMAC polymers were compared to two commercial CWMs. The fact that only one of the commercial samples contained a yield stress indicated that a yield stress is not essential for a commercial product. The commercial samples were pseudoplastic and contained a large percentage of coal particles < 20 ~m. In spite of this CWMs containing polyDADMAC (1) and polyDADMAC (P) performed quite well in comparison with the commercial samples. Several properties of CWMs have been elucidated which indicate that cationic polyelectrolytes, in particular polyDADMAC (1) and polyDADMAC (P), have potential in CWM formulations. A further study could investigate the atomisation and combustion properties of CWMs containing cationic polyelectrolytes, in particular polyDADMAC (1) and polyDADMAC (P).
APA, Harvard, Vancouver, ISO, and other styles
3

Pilipenko, Polina. "Cationic Polyelectrolytes as Primary Coagulants for Municipal Wastewater Treatment." Doctoral thesis, Norwegian University of Science and Technology, Department of Hydraulic and Environmental Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1480.

Full text
Abstract:

Chemical treatment is an established technique for wastewater purification used alone or as a pre-treatment before biological treatment. In spite of many advantages associated with it, the excessive sludge production makes this technology undesirable. Since the sludge produced during chemical treatment to a great extend is a precipitated metal phosphate/hydroxide, a complete or partial substitution of metal salt by a cationic polyelectrolyte may reduce the sludge production.

This dissertation investigates the potential of synthetic organic polyelectrolytes for removal of the particulate and colloid matter from municipal wastewater. In the first two chapters of the thesis the state of the art and the theoretical background are discussed. Chapter 3 presents the hypotheses proposed based on first two chapters. Chapter 4 describes the experimental design and procedures as well as analytical methods utilised. Chapter 5 is devoted to presentation and discussion of experimental results. In Chapter 6 the relationships between polymer structure, wastewater quality and treatment performance were established and models were proposed for prediction of polyelectrolyte dose and effluent quality. Chapter 7 consists of analysis of hypotheses and recommendations for polyelectrolyte selection. Finally, Chapter 8 concludes the work of this thesis.

The results of this thesis show that synthetic organic polyelectrolytes are effective coagulants for wastewater treatment. Both low and high molecular weight cationic polyelectrolytes can be used as solo primary coagulants and combined with low dosage inorganic coagulant. The optimum dosage of the low molecular weight polyelectrolyte (PDADMAC and P-Epi-DMA) is affected by the concentration of the particles, colloids and soluble organic matter. The specific dosage is significantly reduced with increasing concentration of the particulate matter. The soluble organic matter has a negative effect on the treatment efficiency and increases the optimum dosage. The residual polyelectrolyte concentration is a function of dosage for each polyelectrolyte tested. The molecular weight within one type of polyelectrolyte has little effect on the residual polyelectrolyte concentration. Very high molecular weight polyelectrolytes (PAM and PE) have lower residuals than the PDADMACs and P-Epi-DMA. The optimisation of the rapid mixing and flocculation procedures is crucial for minimising residual polymer concentration.

The process of wastewater coagulation-flocculation by the low molecular weight polyelectrolytes can be satisfactory described using a statistical multilinear regression model and mathematical regression model. The proposed models allow accurate prediction of the optimum dosage.

Addition of a low dosage of inorganic salt (i.e. Fe) significantly improves suspended particles and colloids removal by polymers. The combined coagulant removes the ortho-phosphates as well. Coagulation by such a dual coagulant is satisfactory described by the mathematical regression model. The treatment efficiency can be predicted with 90% accuracy.

The interaction between polyelectrolyte and dissolved organic matter lead to production of complexes, observed as colloidal particles. The size of the particle aggregates produced depends on the concentration ratio polyelectrolyte/dissolved organics organics.

APA, Harvard, Vancouver, ISO, and other styles
4

Zeng, Faquan. "Synthesis of cationic macromonomers by living polymerizations for comb-branched polyelectrolytes /." *McMaster only, 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lee, Shun Yin. "The flocculation of charged particles in aqueous solutions by cationic polyelectrolytes." Thesis, University College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322484.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Crow, Roger D. "The influence of aluminum salts on the adsorption of cationic polyelectrolyte by cellulosic fibers." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/5752.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Salem, Tarek Sayed Mohamed. "Plasma-based surface modifications of polyester fabrics and their interaction with cationic polyelectrolytes and anionic dyes." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83580.

Full text
Abstract:
Plasma-based surface modifications offer many interesting possibilities for the production of high value-added polymeric materials. In this work, different plasma-based synthetic concepts were employed to endow poly(ethylene terephthalate) (PET) fabrics with accessible amine functionalities. These concepts were compared to find out the appropriate engineering methods, which can be further accepted by textile industries to overcome the limited reactivity of PET fabric surfaces, while the bulk characteristics are kept unaffected. Amine functionalities were introduced onto the surface of PET fabrics using either low-pressure ammonia plasma treatment or coating oxygen plasma-treated PET fabric with cationic polyelectrolytes. Two different cationic polyelectrolytes were used in this study namely poly(diallyldimethylammonium chloride) as an example of strong polyelectrolytes and poly(vinyl amine-co-vinyl amide) as an example of weak polyelectrolytes. The modified surfaces were characterized by a combination of various surface-sensitive techniques such as X-ray photoelectron spectroscopy (XPS), electrokinetic measurements and time-dependent contact angle measurements. Furthermore, the amine functionalities introduced by different surface modifications were used for the subsequent immobilization of various classes of anionic dyes to evaluate the efficiency of different surface modifications. Color strength (K/S) and fastness measurements of colored fabrics were also explored. Their results can be taken as a measure of the extent of the interaction between different modified surfaces and anionic dyes. Finally, it was demonstrated that anchoring poly(vinyl amine-co-vinyl amide) layer onto PET fabric surfaces modified with low-pressure oxygen plasma is an efficient approach to improve coloration behavior and to overcome different problems related to PET fabrics coloration, such as coloration of PET/wool blend fabric with a single class of dyes. This is a crucial step towards the substrate independent surface coloration, which becomes dependent on the properties of the top layer rather than chemical structure of the fibers.
APA, Harvard, Vancouver, ISO, and other styles
8

Maxwell, Kendra Elaine. "Cationic polymer enhanced hydrolysis of cornstarch for the production of biofuels." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43661.

Full text
Abstract:
The mechanism through which a charged polymer cationic polyacrylamide (C-PAM) operates to increase the rate of cornstarch hydrolysis was investigated. The main objective was to determine the major factors that affect the mechanism so that these parameters may be adjusted to achieve optimal hydrolysis rates. A combination of analytical methods including dynamic light scattering, optical imaging, and uv-vis spectroscopy were used to study polymer, starch, and enzyme interactions as a function of process conditions. It was found that C-PAM binds strongly to starch granules, increasing solubilization and decreasing onset gelatinization temperature. Granule swelling was unaffected by C-PAM. Both binding of enzyme to cornstarch, and rate of cornstarch hydrolysis were found to increase in the presence of C-PAM. By analogy to previous work on cationic polymer promoted hydrolysis of cellulose, it was proposed that the polymer reduces the charge on the starch surface through a "charge-patch" mechanism. Because both enzyme and substrate are negatively charged, the positively charged polymer reduces the charge repulsion experienced by the approaching enzyme. This leads to stronger enzyme-substrate binding, and faster hydrolysis. There is a mirror image relationship between viscosity of the medium and hydrolysis rate, which allows optimization of these parameters with enzyme and C-PAM dosage. Overall, the polymer addition reduced enzyme dose by 62% depending on the conditions used, so this method could have significant economic impact on the industrial conversion of starch to ethanol.
APA, Harvard, Vancouver, ISO, and other styles
9

Leiviskä, T. (Tiina). "Coagulation and size fractionation studies on pulp and paper mill process and wastewater streams." Doctoral thesis, University of Oulu, 2010. http://urn.fi/urn:isbn:9789514260889.

Full text
Abstract:
Abstract This thesis aims to increase our knowledge about the characteristics of chemical pulp process and wastewaters and how problematic substances, e.g. wood extractives, could be removed effectively and selectively by coagulation–flocculation with either internal or external water treatment. Characterization was performed by investigating kraft pulp bleaching filtrates, as well as wastewater, before (influent) and after (effluent) the activated sludge treatment by means of a range of chemical analyses and by carrying out size fractionation studies. Cationic polyelectrolytes were used to purify oxygen stage bleaching filtrate, and charge analyses (zeta potential, charge quantity) were carried out in order to understand the coagulation phenomenon. In activated sludge treatment, the enhancement of particle removal, either by filtration or using a chemical in the primary clarifier, would lead to savings in aeration costs and result in a more stable process. Microfiltration already with a large pore size (8 µm) removed 30–50% of the wood extractives from the influent. Separate treatment stages for certain wastewater fractions, e.g. debarking plant effluent, would ensure cost-efficiency. After the activated sludge process, the wood extractives were present as particles (18%) and < 3 kDa fraction (82%). β-sitosterol occurred only in particles in the effluent. The release of harmful components into the environment could be decreased by microfiltration (e.g. 0.45 µm) of the final effluent or using a chemical in the secondary clarifier. Interestingly a huge increase in BOD was realized in the 3 kDa fraction of both influent and effluent, which indicated the presence of toxic substances in the larger fractions. After passing the effluent into the water system, there might be a similar jump in the BOD because the effluent is diluted many-fold. This would contribute to the formation of areas with an oxygen deficit. In the coagulation–flocculation studies, effective and selective removal of wood extractives (92%) from the oxygen stage filtrate was obtained with a cationic polyelectrolyte of medium molecular weight and medium charge density at 72 °C and pH 5–6. The multimodal zeta potential distribution gave more information than the average zeta potential. Aggregation of colloidal particles occurred when only one zeta potential was observed. The number of different zeta potentials diminished with decreasing pH and after exceeding a certain polyelectrolyte dosage level.
APA, Harvard, Vancouver, ISO, and other styles
10

Melo, Letícia Dias de. "Partículas e filmes híbridos de polímeros e compostos de amônio quaternário com atividade antimicrobiana." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/9/9136/tde-04012012-153521/.

Full text
Abstract:
Partículas e filmes híbridos de polímeros e compostos de amônio quaternário (CAQ) foram caracterizados quanto a propriedades físicas e atividade contra cepas de Pseudomonas aeruginosa ATCC 27853 e Staphylococcus aureus ATCC 25923. Partículas híbridas foram obtidas a partir de fragmentos de bicamada (BF) de brometo de dioctadecildimetilamônio (DODAB), adicionados consecutivamente de soluções de carboximetilcelulose (CMC) e cloreto de poli (dialildimetilamônio) (PDDA) e, a seguir, caracterizadas por espalhamento de luz dinâmico para determinação de distribuições de tamanho, diâmetro médio (Dz) e potencial-zeta (ζ). Filmes híbridos foram obtidos por revestimento rotacional de lamínulas de vidro a partir de uma solução clorofórmica de poli (metil metacrilato) (PMMA) e CAQ onde [PMMA] = 10 mg/mL e [CAQs] = 0,03 4 mM de DODAB, brometo de cetiltrimetilamônio (CTAB) ou brometo de tetrapropilamônio (TPAB). Molhabilidade dos filmes e difusibilidade dos CAQs nos filmes imersos em água foram avaliadas por determinação de ângulo de contato e de tensão superficial na interface ar-água, respectivamente. Atividade antimicrobiana foi avaliada por plaqueamento e contagem de viáveis, tanto para os filmes quanto para as partículas. Para os filmes, também foram determinados halos de inibição. Partículas de DODAB BF/ CMC/ PDDA exibiram Dz e ζ dependentes da concentração dos componentes. A 0,1 mM de DODAB, 0,1 mg/mL de CMC e 0,1 mg/mL de PDDA, foram obtidas partículas pequenas (Dz = 100 nm; ζ = 30 mV). Com 0,5 mM de DODAB, 0,5 mg/mL de CMC e 0,5 mg/mL de PDDA foram obtidas partículas grandes (Dz = 470 nm; ζ = 50 mV). Contra 107 UFC/mL, 1 - 2 µg/mL de PDDA, sozinho em solução ou em forma de partículas, matou 99 % das células de P. aeruginosa. O mesmo ocorreu contra S. aureus (107 UFC/mL) em 10 µg/mL de PDDA. A ação antimicrobiana mostrou-se dependente da quantidade de cargas positivas nas partículas e independente do tamanho da partícula. Filmes de PMMA/ CAQ apresentaram maior molhabilidade do que aqueles de PMMA puro. Filmes de PMMA/ DODAB e PMMA/ TPAB submersos em água não causaram alterações de tensão superficial na interface ar-água, indicando baixa difusibilidade destes CAQs a partir dos filmes. Filmes de PMMA/ CTAB submersos em água reduziram a tensão superficial até aproximadamente 60 mN/m, mostrando a difusibilidade do CTAB no filme e sua organização na interface ar-água. O efeito antimicrobiano dos filmes PMMA/ DODAB e PMMA/ CTAB foi dependente da concentração do CAQ utilizada no preparo do filme. Viabilidade celular de 0% contra 107 UFC/mL de ambas as bactérias ocorreu com 4 mM de DODAB ou, com 2 ou 0,2 mM de CTAB contra P. aeruginosa ou S. aureus, respectivamente. Filmes de PMMA/ TPAB não apresentaram atividade antimicrobiana. Com a emergência de micro-organismos resistentes aos antibióticos, os novos nanomateriais antimicrobianos híbridos de polímeros e compostos de amônio quaternário podem representar uma alternativa de fácil obtenção e baixo custo.
Hybrid particles and films from polymers and quaternary ammonium compounds (QAC) were characterized regarding its physical properties and antimicrobial activity against strains of Pseudomonas aeruginosa ATCC 27853 or Staphylococcus aureus ATCC 25923. Hybrid particles were obtained from dioctadecyldimethylammonium bromide (DODAB) bilayer fragments (BF), consecutively added of carboximethylcellulose (CMC) and poly (diallyldimethylammonium) chloride (PDDA) solutions, and then, characterized by dynamic light-scattering for determination of size distributions, z-average diameter (Dz) and zeta-potential (ζ). Hybrid films were obtained by spin-coating of a chloroformic solution of poly (methylmethacrylate) (PMMA) and QAC on glass coverslips at [PMMA] = 10 mg/mL and [QACs] = 0.03 -4 mM where QACs were DODAB, cetyltrimethylammonium bromide (CTAB) or tetrapropylammonium bromide (TPAB). Films wettability and QACs diffusibility in the films immersed in water were evaluated by determinations of contact angle and surface tension at air-water interface, respectively. Antimicrobial activity was evaluated by plating and CFU counting both for particles and films. For the hybrid films, width of inhibition zone was also determined. DODAB BF/ CMC/ PDDA particles exhibited Dz and ζ dependent on the concentrations of the components. At 0.1 mM DODAB, 0.1 mg/mL CMC, and 0.1 mg/mL PDDA, small cationic particles were obtained (Dz = 100 nm; ζ = 30 mV). At 0.5 mM DODAB, 0.5 mg/mL CMC and 0.5 mg/mL PDDA, large cationic particles were obtained (Dz = 470 nm; ζ = 50 mV). At 107 CFU/mL, cell viability of 1 % for P. aeruginosa was obtained for PDDA in solution or covering particles at 1 or 2 µg/mL PDDA, respectively. Against S. aureus (107 CFU/mL) at 10 µg/mL PDDA, a similar result was obtained. The antimicrobial effect was dependent on the amount of positive charge on particles and independent on particle size. The hybrid films of PMMA/ QAC showed higher wettability than those of pure PMMA. PMMA/ DODAB and PMMA/ TPAB hybrid films, submerged in water, did not cause changes in surface tension at the air-water interface, indicating low diffusibility for both DODAB and TPAB in hybrid films. Films of PMMA/ CTAB, submerged in water, reduced the surface tension to about 60 mN/m, showing that CTAB could diffuse from the film to the air-water interface and change its surface tension. The antimicrobial effect of PMMA/ DODAB and PMMA/ CTAB hybrid films was clearly dependent on the QAC concentration used to prepare the films. Cell viability of 0% for P. aeruginosa and S. aureus (107 CFU/mL) occurred at 4 mM DODAB, or 2 and 0.2 mM CTAB, respectively. Films of PMMA/ TPAB showed no antimicrobial activity. With the emergence of microorganisms resistant to antibiotics, the novel hybrid antimicrobial nanomaterials may become important since they are inexpensive and easy to obtain.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Cationic polyelectrolytes"

1

Stephens, Brian Paul. Cationic Polyelectrolytes in coal water mixture formulations. Huddersfield: The Polytechnic, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Crow, Roger D. The influence of aluminum salts on the adsorption of cationic polyelectrolyte by cellulosic fibers. Appleton, WI: Institute of Paper Chemistry, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Topchiev, D. A. Kationnye poliėlektrolity: Poluchenie, svoĭstva i primenenie. Moskva: Akademkniga, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Mitrakos, Peter. Polyelectrolyte induced domains in cationic lipid bilayer membranes: A deuterium nuclear magnetic resonance perspective. Dept of Chemistry, U of Toronto, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Anionic polyelectrolyte binding to mixed cationic-zwitterionic surfactant micelles: A molecular perspective from [2]H NMR spectroscopy. Ottawa: National Library of Canada, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Cationic polyelectrolytes"

1

Chu, Deh-Ying, and J. K. Thomas. "Interaction of Cationic Species with Polyelectrolytes." In ACS Symposium Series, 434–51. Washington, DC: American Chemical Society, 1987. http://dx.doi.org/10.1021/bk-1987-0358.ch032.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Devore, D. I., N. S. Clungeon, and S. A. Fischer. "Adsorption and Viscoelastic Properties of Thermosetting Cationic Polyelectrolytes." In ACS Symposium Series, 394–405. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1994-0548.ch030.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Eriksson, Leif, and Barbro Alm. "Model System Studies of Formation and Properties of Flocs Obtained with Cationic Polyelectrolytes." In Chemical Water and Wastewater Treatment II, 19–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77827-8_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Sherly, M. Caroline Diana, S. S. Priya, and M. R. Rekha. "Cationic Polyelectrolyte Vectors in Gene Delivery." In Particulate Technology for Delivery of Therapeutics, 395–417. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3647-7_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Hirata, Mitsuo, Kazunori Yamada, Kiyomi Matsuda, and Etsuo Kokufuta. "Cationic Polyelectrolyte Gel from Poly(ethylenimine)." In ACS Symposium Series, 493–98. Washington, DC: American Chemical Society, 1993. http://dx.doi.org/10.1021/bk-1994-0548.ch037.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bordi, F., C. Cametti, D. Gaudiuo, T. Gili, S. Sennato, and A. Di Biasio. "Polyelectrolyte coupling to charged lipid monolayers and to cationic liposomes." In Trends in Colloid and Interface Science XVII, 47–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b93986.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Tsai, Tsung-Han, Craig Versek, Michael Thorn, Mark Tuominen, and E. Bryan Coughlin. "Block Copolymers Containing Quaternary Benzyl Ammonium Cations for Alkaline Anion Exchange Membrane Fuel Cells (AAEMFC)." In Polymers for Energy Storage and Delivery: Polyelectrolytes for Batteries and Fuel Cells, 253–65. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1096.ch015.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

"Design of Biologically Active Polymer Surfaces: Cationic Polyelectrolytes as Multifunctional Platform to Prevent Bacterial Attachment." In Smart Materials: Integrated Design, Engineering Approaches, and Potential Applications, 357–86. Toronto ; New Jersey : Apple Academic Press, 2018.: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781351167963-19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Maiti, Sabyasachi, Sougata Jana, and Bibek Laha. "Cationic polyelectrolyte–biopolymer complex hydrogel particles for drug delivery." In Design and Development of New Nanocarriers, 223–56. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-813627-0.00006-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Dragan, Stela, Mariana Cristea, Cornelia Luca, and B. C. Simionescu. "POLYELECTROLYTE COMPLEXES BETWEEN A WEAK POLYANION AND A STRONG POLYCATION WITH CATIONIC GROUPS IN THE MAIN CHAIN." In Progress in Ion Exchange, 53–61. Elsevier, 1997. http://dx.doi.org/10.1533/9781845698652.1.53.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Cationic polyelectrolytes"

1

Rabiee, Ahmad. "Acrylamide-Based Cationic Polyelectrolytes and Their Potential Applications: A Survey." In 2011 International Conference on Management and Service Science (MASS 2011). IEEE, 2011. http://dx.doi.org/10.1109/icmss.2011.5999328.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

STREKAL, N. D., A. M. BELIAEV, V. I. STSIAPURA, S. A. MASKEVICH, and O. S. KULAKOVICH. "PHOTOLUMINESCENCE OF CdSe/ZnS QUANTUM DOTS BOUND TO ANIONIC AND CATIONIC POLYELECTROLYTES." In Proceedings of the International Conference on Nanomeeting 2007. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770950_0117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kirby, Glen H., Kevin M. Cooley, and Beth L. Armstrong. "Tailored Rheological Behavior of Mullite and BSAS Suspensions Using a Cationic Polyelectrolyte." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68491.

Full text
Abstract:
The effects of a cationic polyelectrolyte, polyethylenimine, on the rheological behavior of aqueous mullite and celsian phase, barium strontium aluminosilicate (BSAS) suspensions have been studied to optimize a dip-coating process. The surface of the ceramic particles was characterized in aqueous media using zeta potential measurements. The ionization behavior and hydrodynamic radius of polyethylenimine in aqueous media was characterized by potentiometric titration and dynamic light scattering measurements, respectively. The rheological behavior of concentrated ceramic suspensions containing polyethylenimine was characterized by stress viscometry and elastic modulus measurements. Polyethylenimine imparts repulsive, electrosteric interactions between mullite and BSAS particles in aqueous suspension, resulting in shear thinning flow behavior, linear elastic moduli, and yield stress values that are minimized for suspensions with a critical PEI concentration of 0.2 mg PEI per m2 of mullite and 0.4 mg PEI per m2 of BSAS, respectively. The elastic moduli and yield stress of mullite and BSAS suspensions were nearly identical at equivalent fractions of their critical PEI concentration. Uniform coatings were obtained upon dipping SiC, Si3N4, and Si-metal substrates into shear-thinning suspensions containing PEI at 81–88% of the critical concentration. Dense mullite coatings were demonstrated on SiC substrates after sintering at 1400°C.
APA, Harvard, Vancouver, ISO, and other styles
4

Talukdar, Hrishikesh, Suman Sarkar, and Sarathi Kundu. "Electrical investigation on thin films of poly(3,4-ethylenedioxythiophene): poly (styrenesulfonate) in presence of cationic polyelectrolyte." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113125.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Mihai, Mihaela. "COMPLEX DERIVED FROM THE MEDIUM ANIONIC POLYELECTROLYTE AND MEDIUM CATIONIC SURFACTANT � NEW COAGULANTS USED IN WASTEWATER TREATMENT." In SGEM2011 11th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2011/s20.111.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Artemev, Alexandr. "FLOCCULATION OF FINE APATITE AIMED AT REDUCING ENVIRONMENTAL WATER USE PROBLEMS IN MINERAL PROCESSING PLANTS." In GEOLINKS Conference Proceedings. Saima Consult Ltd, 2021. http://dx.doi.org/10.32008/geolinks2021/b1/v3/48.

Full text
Abstract:
"Water treatment technologies involving pre-treated industrial effluents without transporting them to the tailing dump are of interest primarily from an environmental point of view, as they reduce the environmental burden. The paper studies the possibility of purification of process waters from apatite concentrate production from suspended particles and water-soluble impurities using polyacrylamide flocculants. By studying the processes of adsorption of H+ and OH- ions from aqueous solutions, the acid-base properties of the surface of the solid phase of the most polluted technological product - the drain of the apatite concentrate thickener - the mineral composition of which is 90% apatite have been studied. The influence of the reagents present in the processing technology on the quantitative ratio of acid-base centres on the apatite surface has been evaluated. It has been shown that the interaction of these reagents with the mineral creates prerequisites for a greater efficiency of the anionic flocculant. The electro-surface properties of apatite treated with various reagents were studied using the laser Doppler electrophoresis method. The mechanism of fixation of ions present in the dispersion medium on the surface of apatite was studied by infrared spectroscopy. In order to determine the conditions under which various flocculants are in the most ionized state, studies were conducted on the change in the viscosity of the polyelectrolyte solution at different pH values. The position of the isoionic point for samples of cationic and anionic flocculants in the presence of reagents used in the apatite flotation and dehydration of apatite concentrate was studied. A research has been carried out on ""model"" and real suspensions in circulating water for a number of cationic, anionic and nonionic flocculants. The kinetic and concentration dependences of the flocculating capacity of the studied reagents were determined, which confirmed the high efficiency of the anionic type reagents"
APA, Harvard, Vancouver, ISO, and other styles
7

Han, Li-Hsin, Tingji Tang, and Shaochen Chen. "Photo-Deformable Micro-Shells of Nanometer Thick." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87059.

Full text
Abstract:
Azobenzene is a chemical structure that directly transmits energy of ultraviolet (UV) light, through an isomerization between the trans and cis states of a double bond between two nitrogen atoms, to a mechanical effect that reduces its molecular length from 9.0 Å to 5.5 Å [1]. This phenomenon has been applied in the fabrication of photo-deformable polymers, where monomers containing azobenzene were polymerized to form gel-like materials [1, 2, 3]. The mechanism of photo-isomerization could be very promising for the field concerning nano/micro-electro-mechanical-system (MEMS/NEMS) [4]. Layer-by-layer (LBL) method [5, 6] is a method to form thinfilms of nanometer-scale thickness through a series of adsorptions of poly-anions and poly-cations onto a charged template. 3-dimensional (3D) hollow shells can be formed by casting the LBL film onto small particles and subsequently etching away the particles. [7–11]. This report is about a combination between the photoisomerization phenomenon and LBL method. Silica micro-spheres (6.84 μm in diameter) were used as templates. In a series of LBL procedures, poly- (1- 4- 3 carboxy- 4- hydroxyphenyl azobenzene sulfonaide-1, 2-ethanediyl, sodium salt) (PAZO) and poly-allylamine hydrochloride (PAH, a poly-cation) solutions were alternatively deposited onto the surfaces of the micro-spheres. Details of the procedures followed reference [9]. After 20 PAZO/PAH double layers were formed, we etched away the SiO2 cores by using 6:1 buffered hydrofluoride acid (BHF) and successfully formed 3-dimemsional (3D) hollow shells (Figure 1). We used a 355 nm Nd:YAG pulse-laser to irradiate the micro-shells. The microshells contracted anisotropically under the laser irradiation, and the shape of microshells changed from spherical to ellipsoidal. The long axes of the contracted microshell are parallel to the direction of the polarization of the UV laser (Figure 2). We believe that this anisotropic deformation is generated from a polarization dependence of the photo-isomerization rate of the azobenzene groups in the microshells. The deformed micro-shells were tested by irradiation of a 532nm pulse laser. The contraction, however, is not recoverable even through cis-trans isomerization was shown generated by visible-light irradiation [3]. To solve this problem, further study is needed to investigate the details of the micro-shells’ deformation. Nevertheless, we think it is quite possible that the irreversibility was resulted from the migrations and re-adhesions between the polyelectrolyte molecules during the UV irradiation. We believed that this kind of technique is very promising for the development micro and nanomachines (MEMS/NEMS). For instance, the large volumic shrinkage of the micro-shells could be applied to the field concerning nano-robots, artificial muscles, or drug delivery systems.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Cationic polyelectrolytes' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography