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Synthesis, characterization and magnetorheological properties of carbonyl iron suspension with superparamagnetic nanoparticles as an additive

機(jī)譯：超順磁性納米粒子作為添加劑的羰基鐵懸浮液的合成，表征和磁流變性能

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Magnetorheological (MR) fluids are suspensions of micron-sized particles dispersed in carrier fluid. Due to high density magnetic particles, MR fluids are facing the problem with the instability of the suspension caused by high settling rate. Recently, researches have been conducted on the advantages of using the mixture of magnetic nanoparticles and microparticles, called bidisperse MR fluids. However, even though the sedimentation stability is improved, there is a reduction in dynamic yield stress when the nanoparticle is introduced. In this work, the investigation of magnetic iron nanoparticles (gamma-Fe2O3) as an additive to magnetic carbonyl iron (CI) suspension has been proposed so as to improve the sedimentation stability and redispersibility, but at the same time enhance the MR performance. The results indicated that the addition of nanoparticles reduced the sedimentation rate, improved redispersibility and enhanced the rheological performance of MR fluids as the particle fill the voids between the microparticles and strengthened the interparticle chains contributing to well-arranged particle structures.
機(jī)譯：磁流變（MR）流體是分散在載流體中的微米級(jí)顆粒的懸浮液。由于高密度的磁性顆粒，MR流體面臨著由高沉降速率引起的懸浮液不穩(wěn)定的問題。最近，已經(jīng)對(duì)使用磁性納米顆粒和微粒的混合物（稱為雙分散MR流體）的優(yōu)點(diǎn)進(jìn)行了研究。然而，即使沉積穩(wěn)定性得到改善，當(dāng)引入納米顆粒時(shí)，動(dòng)態(tài)屈服應(yīng)力也會(huì)降低。在這項(xiàng)工作中，已經(jīng)提出了研究磁性鐵納米顆粒（γ-Fe2O3）作為羰基磁性鐵（CI）懸浮液的添加劑，以提高沉積穩(wěn)定性和可再分散性，但同時(shí)提高了MR性能。結(jié)果表明，納米顆粒的添加降低了沉降速率，改善了再分散性，并增強(qiáng)了MR流體的流變性能，因?yàn)樵擃w粒填充了微粒之間的空隙并增強(qiáng)了顆粒間鏈，從而有助于合理地排列顆粒結(jié)構(gòu)。

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