NDLI: Interfacial self-assembly of cellulose-based polyelectrolyte complexes: pattern formation of fractal “trees”

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Soft Matter Vol - 6 Issue - 5

Soft Matter Vol - 6 Issue - 4

Soft Matter Vol - 6 Issue - 3

Interfacial self-assembly of cellulose-based polyelectrolyte complexes: pattern formation of fractal “trees”

Content Provider	Royal Society of Chemistry (RSC)
Author	Qian, Jinwen Zhao, Qiang Gui, Zhangliang Zhu, Meihua An, Quanfu
Copyright Year	2010
Abstract	A two-step procedure was adopted to prepare cellulose-based polyelectrolyte complexes (PECs) nanoparticles dispersed in water. First, an aqueous solution of a weak anionic polyelectrolyte of sodium carboxymethyl cellulose (CMCNa) was mixed with four types of cationic polyelectrolytes (poly 2-methacryloyloxy ethyl trimethylammonium chloride (PDMC), cationic cellulose, poly diallyldimethylammonium chloride (PDDA), chitosan (CS)) in HCl aqueous solutions. Four types of CMCNa-based PEC solids (CMCNa-PDMC, CMCNa-cationic cellulose, CMCNa-PDDA and CMCNa-CS), were obtained, purified and dried. Second, these PECs were re-dispersed in NaOH aqueous solutions. PEC solids and their aqueous dispersions were characterized by FT-IR, wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC) and dynamic light scattering (DLS), respectively. It was found that well grown fractal patterns (referred to as fractal “trees”) with diameters ranging from 5–300 μm for the four PECs were obtained after their aqueous dispersions were dried on silicon wafers or glass slides at 30 °C. This PECs interfacial self-assembly phenomenon is interesting but not shown in literature, even though various other PECs dispersions have also been dried in the similar way. Fractal dimensions of these fractal “trees” were calculated and their structures were characterized by polarized light microscopy (PLM), filed emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM). The formation mechanism of these fractal “trees” was tentatively examined by time-dependent FESEM. Moreover, effects of drying temperature, PEC concentration and solvent composition on fractal “trees” formation were studied. Potential applications of the fractal pattern formation in fields such as fast bottom-up nanofabrication, surface patterning and membrane separation were discussed.
Starting Page	1129
Ending Page	1137
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	6
Issue Number	6
Journal	Soft Matter
DOI	10.1039/b918529a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Carboxymethyl cellulose Differential scanning calorimetry Pattern formation Optical microscope Cellulose NaOH Hydrogen chloride Fourier-transform infrared spectroscopy Nanolithography Scanning electron microscope PEC Polyelectrolyte X-ray crystallography Self-assembly Chloride Fractal Sodium Dynamic light scattering Atomic-force microscopy DSC Micrometre Chitosan Solvent
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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