scholarly journals Hybrid poly(allylamine hydrochloride)–graphene oxide microcapsules: preparation, characterization and application in textiles with controlled release behavior

2020 ◽  
Vol 1 (4) ◽  
pp. 804-813
Author(s):  
Zhiqi Zhao ◽  
Qiujin Li ◽  
Jixian Gong ◽  
Zheng Li ◽  
Jianfei Zhang
Keyword(s):  
Graphene Oxide ◽  
Controlled Release ◽  
Cotton Fabric ◽  
Near Infrared ◽  
Layer By Layer ◽  
Release Behavior ◽  
Layer Technique ◽  
Allylamine Hydrochloride ◽  
Behavior Based ◽  
Layer By Layer Technique

This work represents hybrid poly(allylamine hydrochloride)-graphene oxide microcapsules formed via layer-by-layer technique, which can be coated on cotton fabric for textiles with controlled release behavior, based on pH and near-infrared responsiveness.

Pectin-Chitosan Multilayer Coated Microbeads of Diclofenac Sodium Prepared by Layer-by-Layer Technique

2014 ◽  
Vol 1060 ◽  
pp. 45-49
Author(s):  
Kamonrak Cheewatanakornkool ◽  
Pornsak Sriamornsak
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Diclofenac Sodium ◽  
Gastric Fluid ◽  
Layer By Layer ◽  
Release Behavior ◽  
Freeze Dried ◽  
Layer Technique ◽  
Calcium Pectinate ◽  
Layer By Layer Technique

The main objective of this study was to fabricate biopolymer-based microbeads, providing enteric properties and controlled release of diclofenac sodium, using layer-by-layer technique. The calcium pectinate microbeads have been designed and coated with chitosan and pectin multilayers. Drug release was performed in simulate gastric fluid (pH 1.2) for 2 hours, followed by pH 6.8 buffer for 8 hours. The effects of chitosan concentration, number of layer and drying technique on drug release were investigated. The results showed that the calcium pectinate microbeads could be simply prepared by ionotropic gelation and then coated with chitosan and pectin solutions using layer-by-layer procedure. The diameter of the microbeads ranged from 800 to 1000 μm for air-dried samples and from 1 to 2 mm for freeze-dried samples. The freeze-dried microbeads had a rough surface and many pores inside, as observed by SEM. The microbeads coated with 4% chitosan/4% pectin revealed a slower drug release than those coated with 1% chitosan/4% pectin and demonstrated a controlled release pattern. Moreover, different drying techniques and numbers of layer also influenced drug release behavior of the prepared microbeads.

scholarly journals Fabrication of hybrid graphene oxide/polyelectrolyte capsules by means of layer-by-layer assembly on erythrocyte cell templates

2015 ◽  
Vol 6 ◽  
pp. 2310-2318 ◽  
Author(s):  
Joseba Irigoyen ◽  
Nikolaos Politakos ◽  
Eleftheria Diamanti ◽  
Elena Rojas ◽  
Marco Marradi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Layer Technique ◽  
Polyallylamine Hydrochloride ◽  
Layer By Layer Technique ◽  
Layer Assembly ◽  
Shape And Size

A novel and facile method was developed to produce hybrid graphene oxide (GO)–polyelectrolyte (PE) capsules using erythrocyte cells as templates. The capsules are easily produced through the layer-by-layer technique using alternating polyelectrolyte layers and GO sheets. The amount of GO and therefore its coverage in the resulting capsules can be tuned by adjusting the concentration of the GO dispersion during the assembly. The capsules retain the approximate shape and size of the erythrocyte template after the latter is totally removed by oxidation with NaOCl in water. The PE/GO capsules maintain their integrity and can be placed or located on other surfaces such as in a device. When the capsules are dried in air, they collapse to form a film that is approximately twice the thickness of the capsule membrane. AFM images in the present study suggest a film thickness of approx. 30 nm for the capsules in the collapsed state implying a thickness of approx. 15 nm for the layers in the collapsed capsule membrane. The polyelectrolytes used in the present study were polyallylamine hydrochloride (PAH) and polystyrenesulfonate sodium salt (PSS). Capsules where characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), dynamic light scattering (DLS) and Raman microscopy, the constituent layers by zeta potential and GO by TEM, XRD, and Raman and FTIR spectroscopies.

Immobilization of chlorophyll by using layer-by-layer technique for controlled release systems and photodynamic inactivation

2016 ◽  
Vol 15 ◽  
pp. 147-155 ◽  
Author(s):  
Filipe D.S. Gorza ◽  
Romário J. da Silva ◽  
Tarquin F. Trescher ◽  
Graciela C. Pedro ◽  
Maria A. Oliveira de Sousa ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layer By Layer ◽  
Photodynamic Inactivation ◽  
Layer Technique ◽  
Layer By Layer Technique

Highly transparent and self-healing films based on the dynamic Schiff base linkage

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115247-115251 ◽  
Author(s):  
Jiaoyu Ren ◽  
Yanxi Zhu ◽  
Hongyun Xuan ◽  
Xuefan Liu ◽  
Zhichao Lou ◽  
...  
Keyword(s):  
Schiff Base ◽  
Layer By Layer ◽  
Self Healing ◽  
Layer Technique ◽  
Layer By Layer Technique

In this study, we report highly transparent self-healing films based on Schiff base linkages between DF-PEG and CS via a layer-by-layer technique.

Effect of metal ions on physical properties of multilayers from hyaluronan and chitosan and adhesion, growth and adipogenic differentiation of multipotent mouse fi-broblasts

Soft Matter ◽  
2021 ◽  
Author(s):  
Husnia Muftah Kindi ◽  
Matthias Menzel ◽  
Andreas Heilmann ◽  
Christian EH Schmelzer ◽  
Martin Herzberg ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Physical Properties ◽  
Metal Ions ◽  
Adipogenic Differentiation ◽  
Polyelectrolyte Multilayers ◽  
Layer By Layer ◽  
Layer Technique ◽  
Layer By Layer Technique

Polyelectrolyte multilayers (PEM) consisting of the polysaccharides hyaluronic acid (HA) as polyanion and chitosan (Chi) as polycation are prepared by the layer-by-layer technique (LbL). The [Chi/HA]5 multilayers are exposed to...

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