Gelation of natural polymer dispersed suspensions under electric field

Ko, Young Tae; Choi, Ung Su

doi:10.1039/c1sm06400b

Cited by 21 publications

(9 citation statements)

References 56 publications

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“…In ER fluids, silicone oil is normally applied as the carrier liquid due to its good stability and diverse accessible viscosities. While the range of dielectric particles applied in ER fluids are wide, covering many kinds of materials like inorganics [ 7 , 8 ], semi-conducting polymers [ 9 ], natural polymers [ 10 ] and polyelectrolytes [ 11 ], for real applications, the field-induced change in viscosity or shear stress, which is called ER effect, is the main evaluation criterium of ER fluids. Thus, high and stable ER effect is what researchers want to pursue in the study of ER Fluids.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cellulose/Laponite Composite Particles and Their Enhanced Electrorheological Responses

et al. 2021

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Cellulose, as a natural polymer with an abundant source, has been widely used in many fields including the electric field responsive medium that we are interested in. In this work, cellulose micron particles were applied as an electrorheological (ER) material. Because of the low ER effect of the raw cellulose, a composite particle of cellulose and Laponite was prepared via a dissolution–regeneration process. Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) were used to observe the morphologies and structures of the composite particles, which were different from pristine cellulose and Laponite, respectively. The ER performances of raw cellulose and the prepared composite were measured by an Anton Paar rotational rheometer. It was found that the ER properties of the composite were more superior to those of raw cellulose due to the flake-like shapes of the composite particles with rough surface. Moreover, the sedimentation stability of composite improves drastically, which means better suspension stability.

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Section: Introductionmentioning

confidence: 99%

Preparation of Cellulose/Laponite Composite Particles and Their Enhanced Electrorheological Responses

et al. 2021

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“…In these experiments, columns, disks and more complex structures were obtained by applying appropriate electric fields. The gelation of natural polymer (cellulose, starch, and chitosan) dispersed suspensions under electric fields has also been reported [5]. Clustering of colloidal particles under the influence of an ac electric field and frequency dependent shape changes of clusters were studied in aqueous colloidal dispersions of polystyrene particles [6].…”

Section: Introductionmentioning

confidence: 99%

Electric field induced gelation in aqueous nanoclay suspensions

Paramesh

Bandyopadhyay

2018

Soft Matter

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Aqueous colloidal LAPONITE® clay suspensions transform spontaneously to a soft solid-like arrested state as its aging or waiting time increases. This article reports the rapid transformation of aqueous LAPONITE® suspensions into soft solids due to the application of a DC electric field. A substantial increase in the speed of solidification at higher electric field strengths is also observed. The electric field is applied across two parallel brass plates immersed in the LAPONITE® suspension. The subsequent solidification that takes place on the surface of the positive electrode is attributed to the dominant negative surface charges on the LAPONITE® particles and the associated electrokinetic phenomena. With increasing electric field strength, a dramatic increase is recorded in the elastic moduli of the samples. These electric field induced LAPONITE® soft solids demonstrate all the typical rheological characteristics of soft glassy materials. They also exhibit a two-step shear melting process similar to that observed in attractive soft glasses. The microstructures of the samples, studied using cryo-scanning electron microscopy (SEM), are seen to consist of percolated network gel-like structures, with the connectivity of the gel network increasing with increasing electric field strengths. In comparison with salt induced gels, the electric field induced gels studied here are mechanically stronger and more stable over longer periods of time.

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“…The key of our manufacturing concept is the introduction of electrorheological (ER) phenomena for conductive line-patterning. The ER fluid is a colloidal suspension composed of an insulating liquid medium embodying either a polarizable particulate material or a polarizable liquid material15. Application of an electric field to ER particles induces the formation of chains of particles in the colloidal suspension along the field direction16.…”

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confidence: 99%

Line-patterning of polyaniline coated MWCNT on stepped substrates using DC electric field

et al. 2014

Sci Rep

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Printing electronic components on a chip edge and a stepped substrate with functional inks are an attractive approach for achieving flexible and inexpensive circuits for applications such as flexible displays and large-area chemo/bio/radioactivity sensors. However, it is still challenging because a sufficient cover of the 100 μm high step at the chip edge with a high-resolution pattern is the hardest part of the layer assembling by inkjet printing. Herein, we present a simple and effective strategy to generate electrically conductive line-patterns on stepped substrates by applying the DC electric field. On the surface of flat polyimide substrate, the fine line-pattern (less than 850 nm in line width) is achieved with a polyaniline coated MWCNT dispersed ink. Furthermore, 9.9 μm of line width is successfully patterned on the high stepped poly(dimethylsiloxane) substrate, higher than 100 μm, by printing only 1 time.

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Gelation of natural polymer dispersed suspensions under electric field

Cited by 21 publications

References 56 publications

Preparation of Cellulose/Laponite Composite Particles and Their Enhanced Electrorheological Responses

Preparation of Cellulose/Laponite Composite Particles and Their Enhanced Electrorheological Responses

Electric field induced gelation in aqueous nanoclay suspensions

Line-patterning of polyaniline coated MWCNT on stepped substrates using DC electric field

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