Surface modification of cellulose fibers with layer-by-layer self-assembly of lignosulfonate and polyelectrolyte: effects on fibers wetting properties and paper strength

Abstract Polyelectrolyte (PE) complexes (PECs) are formed by the electronic interaction between cationic and anionic PEs, and a number of factors influence the forming pattern and characteristic of the PECs. In this work, a guanidine-based polymer with high cationic charge density (CD) and low molecular weight (MW) was applied for interacting with anionic carboxymethylcellulose (CMC) with low CD and high MW. To reveal the self-assembly pattern of the PEC, the turbidity of PEC and layer-by-layer (LBL) film, along with its adsorption on cellulose fibers, was characterized. The antimicrobial activity of the handsheet containing the PEC was also investigated. The charge ratio of anionic PE to cationic PE was found to be critical to the PEC stability. The roughness of the LBL film was increased and then decreased with more bilayers assembled. The isothermal adsorption indicated that the amount of adsorbed cationic PE on cellulose fibers was increased significantly by interacting with anionic CMC. The inhibition of the cationic PE on bacterial growth was not impaired by the formation of the complex. The CMC with high MW in the complex could maintain or even improve the antimicrobial efficiency of the guanidine-based polymer in handsheet.

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Wetting properties of silicon mesh microchannels coated with SiO2/SnO2 nanoparticles using layer-by-layer nano self assembly

TRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference ◽

10.1109/sensor.2009.5285478 ◽

2009 ◽

Author(s):

T. Zhang ◽

B. McDonald ◽

T. Cui

Keyword(s):

Self Assembly ◽

Layer By Layer ◽

Wetting Properties

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Surface Modification of Titanium with Heparin-Chitosan Multilayers via Layer-by-Layer Self-Assembly Technique

Journal of Nanomaterials ◽

10.1155/2011/423686 ◽

2011 ◽

Vol 2011 ◽

pp. 1-8 ◽

Cited By ~ 19

Author(s):

Yao Shu ◽

Guomin Ou ◽

Li Wang ◽

Jingcai Zou ◽

Quanli Li

Keyword(s):

Surface Modification ◽

Self Assembly ◽

Pure Titanium ◽

Titanium Substrate ◽

Titanium Implants ◽

Layer By Layer ◽

Assembly Technique ◽

Titanium Surfaces ◽

Modification Of Titanium ◽

Positively Charged

Extracellular matrix (ECM), like biomimetic surface modification of titanium implants, is a promising method for improving its biocompatibility. In this paper chitosan (Chi) and heparin (Hep) multilayer was coated on pure titanium using a layer-by-layer (LbL) self-assembly technique. The Hep-Chi multilayer growth was carried out by first depositing a single layer of positively charged poly-L-lysine (PLL) on the NaOH-treated titanium substrate (negatively charged surface), followed by alternate deposition of negatively charged Hep and positively charged Chi, and terminated by an outermost layer of Chi. The multilayer was characterized by DR-FTIR, SEM, and AFM, and osteoblasts were cocultured with the modified titanium and untreated titanium surfaces, respectively, to evaluate their cytocompatibilityin vitro. The results confirmed that Hep-Chi multilayer was fabricated gradually on the titanium surface. The Hep-Chi multilayer-coated titanium improved the adhesion, proliferation and differentiation of osteoblasts. Thus, the approach described here may provide a basis for the preparation of modified titanium surfaces for use in dental or orthopedic implants.

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