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Xem 1-19 trên 19 kết quả Polyelectrolyte
  • A polyelectrolyte complex (PEC) matrix formed between chitosan and pectin was developed to entrap a bioactive compound (anthocyanin), obtaining an useful pH indicator device. Polysaccharides of opposite charges such as chitosan and pectin can have a very strong intermolecular interaction.

    pdf9p vihermione 06-01-2023 3 2   Download

  • The aim of this study was to evaluate and characterize the interaction between fish gelatin (FG) and Gum Arabic (GA) and its effects in obtaining optimal atomization conditions. The technological properties of FG-GA shown high potential to be applied in the food industry as well in other industrial fields like chemical and pharmaceutical areas.

    pdf11p vihermione 06-01-2023 3 2   Download

  • In the present study, supramolecular polyelectrolyte complexes (SPEC) based on a cyclodextrin-grafted chitosan derivative and carrageenan were prepared and evaluated for controlled drug release. Samples were characterized by FTIR, SEM, and ζ-potential measurements, which confirmed the formation of the polymeric complex.

    pdf13p viginny 30-12-2022 5 3   Download

  • The aim of research was to develop biopolymer films based on natural polysaccharides. For the first time, biodegradable films were obtained on the basis of a furcellaran-chitosan polyelectrolyte complex. The conditions for its formation were determined by measuring the zeta potential as a function of colloid pH, the size of pure components and their mixtures.

    pdf11p viginny 30-12-2022 8 2   Download

  • Monoaldehydes, due to natural origin and therapeutic activity, have attracted great attention for their ability to crosslink chitosan hydrogels for biomedical applications. However, most studies have focused on singlecomponent hydrogels. In this work, chitosan-based hydrogels, crosslinked for the first time with 2,3,4-trihydroxybenzaldehyde (THBA), were modified with pectin (PC), bioactive glass (BG), and rosmarinic acid (RA).

    pdf12p viginny 30-12-2022 4 2   Download

  • This study reports the preparation of microspheres of pectin and magnetite nanoparticles coated by chitosan to encapsulate and deliver drugs. Magnetic-pectin microspheres were obtained by ionotropic gelation followed by polyelectrolyte complexation with chitosan.

    pdf10p viginny 30-12-2022 4 2   Download

  • Dextran esters of different amino acids (glycine, β-alanine, L-ornithine, L-lysine) are investigated regarding their pKa values by potentiometric titration. The pKa values of the dextran derivatives are generally dependent on the position of the amino group in relation to the ester group, i.e. the nearer they are located in the molecule, the lower the resulting pKa values are, L-ornithine ester being the exception. An influence of the polymer backbone is ruled out.

    pdf12p tudichquannguyet 29-11-2021 7 0   Download

  • This work reports the synthesis and properties of a new membrane based on polyvinyl chloride (PVC) grafting with polyacrylic acid (PAA) using argon (Ar) plasma. The membranes of PVC were synthesized by solutioncasting method, where PAA was deposited as an ultrathin film onto PVC using dielectric barrier discharge at atmospheric pressure with Ar gas. The surface characteristics and chemical composition of the modified membranes were analyzed by water contact angle, scanning electron microscopy, and Fourier transform infrared spectroscopy.

    pdf11p tudichquannguyet 29-11-2021 8 1   Download

  • Polymers bearing quaternized 4-vinylpyridine (QVP) groups are known for their antibacterial activities and these polymers can form polyelectrolyte complexes (PEC) with polyanions through electrostatic interactions. PEC formation can be used to adjust the antibacterial activity of polymers of QVP, deliver active molecules, or design antibacterial supramolecular structures. However, the antibacterial activity of PECs of QVP polymers has not been investigated. In this study, a copolymer of QVP was mixed with polyacrylic acid in various molar ratios of components to form PECs.

    pdf13p tudichquannguyet 29-11-2021 4 0   Download

  • Poly(3-thiophene acetic acid) (P3TAA) was synthesized using chemical procedures. The structure, surface and morphology of these water-soluble polythiophenes were determined by introducing pH-responsive carboxylic acid groups at the 3-position of thiophene ring and doing FT-IR spectra, SEM and TGA analyses.

    pdf8p tamynhan5 10-12-2020 6 1   Download

  • The present work deals with the leachate treatment using the following processes: coagulation-flocculation by alumina sulfate followed by anionic polyelectrolyte, on one hand. This treatment is preceded by a pretreatment using NaOH and KOH. On the other hand, adsorption by bark Alep pine powder and fibers of date palm leaves is used.

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  • The phenomena of charge inversion and effective attraction between the like - charged spherical macromolecules in electrolyte solvent has been studied by using Poisson - Boltzmann mean-field theory, alongside the assumption that counterions condense on the surface of macromolecules to form a strongly correlation liquid.

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  • It is shown that the condensation of the polyelectrolyte around the macroion shows a first order phase transition from a dense to a dilute concentration of monomers. The width of the condensed region increases with stronger screening or with smaller macro-ion charges. For small macro-ion charge, or when the Coulomb interactions are strongly screened, no complexation between the polyelectrolyte and the macro-ion happens. Additionally, long polyelectrolyte protrudes both tails and loops from the macroion. This is quite different from the case of large macroions where only tails appear.

    pdf9p thuyliebe 08-10-2018 17 1   Download

  • In the present study intestinal delivery systems resistant to gastric juice, loaded with the probiotic bacteria Lactobacillus acidophilus LA14 and Bifidobacterium lactis BI07, were produced by the polyelectrolyte complexation. First, beads were prepared by the traditional extrusion method and nine formulations were developed using alginate as main carrier and the biopolymer, xanthan gum, as hydrophilic retardant polymer or the cellulose derivative, cellulose acetate phthalateDevelopment of microparticulate systems for intestinal delivery of Lactobacillus acidophilus and Bifidobacterium lactis.

    pdf8p nhoxtom 29-09-2015 69 8   Download

  • Soft matter (or soft condensed matter) refers to a group of systems that includes polymers, colloids, amphiphiles, membranes, micelles, emulsions, dendrimers, liquid crystals, polyelectrolytes, and their mixtures. Soft matter systems usually have structural length scales in the region from a nanometer to several hundred nanometers and thus fall within the domain of “nanotechnology.” The soft matter length scales are often characterized by interactions that are of the order of thermal energies so that relatively small perturbations can cause dramatic structural changes in them.

    pdf0p thienbinh1311 13-12-2012 42 3   Download

  • The removal of suspended matter from water is one of the major goals of water treatment. Only disinfection is used more often or considered more important. In fact, effective clarification is really necessary for completely reliable disinfection because microorganisms are shielded by particles in the water. Clarification usually involves: • coagulation • flocculation • settling • filtration This guide focuses on coagulation and flocculation: the two key steps which often determine finished water quality....

    pdf41p emyeumoitruong 23-09-2012 77 8   Download

  • Trong bài này đề cập đến vấn đề sử dụng polyelectrolyte kết hợp với chất ức chế ăn mòn, có vai trò như là lớp phủ, để tạo thành hệ chống ăn mòn và có khả năng tự phục hồi khi có những tác động bên ngoài làm trầy bề mặt lớp phủ. Chế tạo lớp phủ Daria và các cộng sự đã thực hiện 3 phương pháp phủ đó là: phun khô (spray-drying), phủ quay (spin-coating) và phủ nhún (dip-coating), PEIPSS dùng để phủ, và so sánh 3 phương pháp bằng phổ Ir. Phổ Ir của màng phun khô...

    pdf4p nkt_bibo41 02-02-2012 98 15   Download

  • Nghiên cứu này đã điều tra trong một thời trang so sánh hiệu quả của các cation, polysaccharide, và Polyelectrolyte vào các động lực kết bông và các tính chất cuối cùng của bùn tổng hợp và kích hoạt cả hai.

    pdf11p phalinh20 22-08-2011 61 5   Download

  • CÁC HÓA CHẤT SỬ DỤNG Clo Chất tạo keo tụ (ferric sulphate) Chất tạo mạng hấp dẫn điện (polyelectrolyte) Chất chống tạo bọt (antifoam) Chất khử oxy (oxygen scavenger) Chất chống ăn mòn (corrosion inhibitor) Chất chống tạo muối (scale inhibitor) Chất diệt khuẩn (biocide)

    pdf97p iiduongii9 09-05-2011 216 105   Download


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