Anisotropy in Longitudinal Modulus of Polymer Gels Containing Ferrite

Mitsumata, Tetsu; Juliac, Etienne; Furukawa, Kenta; Iwakura, Kenji; Taniguchi, Takashi; Koyoma, Kiyohito

doi:10.1002/1521-3927(20020201)23:3<175::aid-marc175>3.0.co;2-9

Cited by 23 publications

(12 citation statements)

References 5 publications

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“…Finely BaTiO 3 particles (Aldrich chemical company, Inc.) with the maximum diameter of 3.0 mm were added to the pre-gel solution. The density of BaTiO 3 particles was 6.080 g/cm 3 . The solution was in vacuum with stirring for 10 min, and was poured in a glass mold with silicone spacer to make a sheet-shaped gel with the size of 10 £ 10 £ 1.5 mm 3 .…”

Section: Sample Preparationmentioning

confidence: 99%

“…The mean and maximum change in modulus at 4 kOe was 31 and 71 Pa, which corresponds to 19 and 46%, respectively, compared to no field. Recently, we have investigated the relationship between the magnetization direction and longitudinal modulus of the magnetic gel using ultrasonic wave with 10 MHz [3,4]. The change in longitudinal modulus was cleared to be depending on the magnetization direction.…”

Section: Introductionmentioning

confidence: 99%

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Electrorheological response of swollen silicone gels containing barium titanate

Mitsumata

Sugitani

Koyama

2004

Polymer

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Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrorheological response of swollen silicone gels containing barium titanate

Mitsumata

Sugitani

Koyama

2004

Polymer

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“…Recently, we have investigated the relationship between the magnetization direction and longitudinal modulus of a magnetic gel using an ultrasonic wave with a frequency of 10 MHz. [12,13] The change in longitudinal modulus was found to be dependent on the magnetization direction. The change in modulus Summary: We observed the negative electrorheological phenomenon on swollen silicone gels containing barium titanate.…”

Section: Introductionmentioning

confidence: 97%

Negative Electrorheological Effect of Silicone Gels Containing Barium Titanate

Mitsumata

Sugitani

2004

Macromol. Rapid Commun.

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Summary: We observed the negative electrorheological phenomenon on swollen silicone gels containing barium titanate. Contrary, no negative electrorheological effect was observed in unswollen silicone gels containing barium titanate and silicon gels without barium titanate. The change in storage modulus increased with increasing DC electric field strength. The effects of frequency, degree of swelling, and the field strength have been investigated.Electric‐field dependence of the change in storage modulus at f = 0.1 Hz for swollen silicone/BaTiO3 gels with varying CAT content; (○): CAT 0.1, (□): CAT 0.2, (⋄): CAT 0.3, (×): SG.imageElectric‐field dependence of the change in storage modulus at f = 0.1 Hz for swollen silicone/BaTiO3 gels with varying CAT content; (○): CAT 0.1, (□): CAT 0.2, (⋄): CAT 0.3, (×): SG.

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“…The magnetic gel consisted of poly(vinyl alcohol) (PVA) and magnetic fluids largely elongates under non-uniform magnetic fields [8,9]. The elastic modulus of magnetic soft materials such as PVA-magnetic fluids [10], PVA-barium ferrite [11][12][13] κ-carrageenan-barium ferrite [14,15] gels, and polyurethane-barium ferrite elastomers [16] demonstrates large modulus change due to magnetization. These actuations occur without any physical contact such as electrical leads of generators; this is also a great advantage of the magnetic gel.…”

Section: Introductionmentioning

confidence: 99%

Flexible Fluid Pump Using Magnetic Composite Gels

2007

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A flexible fluid pump made of magnetic composite gels has been developed. The magnetic composite gel was sodium alginate or poly(vinyl alcohol) gel in which barium ferrite particles were dispersed. The pump consisted of a magnetic gel-rotor and a driving magnet. The rotor demonstrated the rotational motion in response to a rotational magnetic field generated by the driving magnet. The gel-rotor had the shape of a screw so as to deliver water efficiently. The diameter of the rotor was varied from 3.8 to 5.5 mm and the diameter of the tube for delivering water was kept as 6 mm. Flow rates pumped by the rotor increased with increasing the diameter, length, and rotation speeds of the rotor. The maximum flow rate of 34 ml/min was achieved when the rotation speeds was 5000 rpm. The rotor with a diameter of 300 μm was also successfully synthesized, however the rotor did not deliver water in a microtube with a diameter of 500 μm. Processing of the gel-rotor, and the efficiency of the water delivery are presented.

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Anisotropy in Longitudinal Modulus of Polymer Gels Containing Ferrite

Cited by 23 publications

References 5 publications

Electrorheological response of swollen silicone gels containing barium titanate

Electrorheological response of swollen silicone gels containing barium titanate

Negative Electrorheological Effect of Silicone Gels Containing Barium Titanate

Flexible Fluid Pump Using Magnetic Composite Gels

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