Provide a detailed summary of the following web content, including what type of content it is (e.g. news article, essay, technical report, blog post, product documentation, content marketing, etc). If the content looks like an error message, respond 'content unavailable'. If there is anything controversial please highlight the controversy. If there is something surprising, unique, or clever, please highlight that as well: Title: Magnetoactive liquid-solid phase transitional matter Site: www.cell.com Introduction Untethered miniature machines have shown tremendous potential in various fields, such as targeted drug delivery, 1 Zhang J. Ren Z. Hu W. Soon R.H. Yasa I.C. Liu Z. Sitti M. Voxelated three-dimensional miniature magnetic soft machines via multimaterial heterogeneous assembly. , 2 Zhao X. Kim J. Cezar C.A. Huebsch N. Lee K. Bouhadir K. Mooney D.J. Active scaffolds for on-demand drug and cell delivery. , 3 Design and rolling locomotion of a magnetically actuated soft capsule endoscope. , 4 Liu X. Yang Y. Inda M.E. Lin S. Wu J. Kim Y. Chen X. Ma D. Lu T.K. Zhao X. Magnetic living hydrogels for intestinal localization, retention, and diagnosis. lab-/organ-on-a-chip, 5 Yu W. Lin H. Wang Y. He X. Chen N. Sun K. Lo D. Cheng B. Yeung C. Tan J. et al. A ferrobotic system for automated microfluidic logistics. , 6 Self-propelled liquid metal motors steered by a magnetic or electrical field for drug delivery. , 7 Wang Y. Duan W. Zhou C. Liu Q. Gu J. Ye H. Li M. Wang W. Ma X. Phoretic liquid metal micro/nanomotors as intelligent filler for targeted microwelding. , 8 Kim, H., Lee, K., Oh, J.W., Kim, Y., Park, J.-E., Jang, J., Lee, S.W., Lee, S., Koo, C.M., and Park, C. (2022). Shape-Deformable and Locomotive MXene (Ti3C2Tx)-Encapsulated Magnetic Liquid Metal for 3D-Motion-Adaptive Synapses. Adv. Funct. Mater. 2210385. https://doi.org/10.1002/adfm.202210385 and microelectronics. 9 Remote modular electronics for wireless magnetic devices. , 10 Peng L. Zhang Y. Wang J. Wang Q. Zheng G. Li Y. Chen Z. Chen Y. Jiang L. Wong C.-P. Slug-inspired magnetic soft millirobot fully integrated with triboelectric nanogenerator for on-board sensing and self-powered charging. , 11 Zhou M. Wu Z. Zhao Y. Yang Q. Ling W. Li Y. Xu H. Wang C. Huang X. Droplets as carriers for flexible electronic devices. , 12 Chen Y. Zhou T. Li Y. Zhu L. Handschuh-Wang S. Zhu D. Zhou X. Liu Z. Gan T. Zhou X. Robust fabrication of nonstick, noncorrosive, conductive graphene-coated liquid metal droplets for droplet-based, floating electrodes. Compared with miniature machines actuated by light, electric field, chemicals, and other stimuli, magnetic-field-driven systems are capable of fast and precise controllability, programmable locomotion, and untethered operation without the need for line-of-site with the stimulation source. 13 Magnetic soft materials and robots. Recently, researchers have put tremendous effort into increasing the mobility, controllability, and morphological adaptability of magnetically actuated machines to broaden their applications. One common class of magnetically actuated miniature machines is composed of soft polymers (e.g., elastomers or hydrogels) embedded with ferromagnetic particles that are engineered with a programmed magnetization profile. 14 Hu W. Lum G.Z. Mastrangeli M. Sitti M. Small-scale soft-bodied robot with multimodal locomotion. , 15 Xia N. Jin B. Jin D. Yang Z. Pan C. Wang Q. Ji F. Iacovacci V. Majidi C. Ding Y. Zhang L. Decoupling and reprogramming the wiggling motion of midge larvae using a soft robotic platform. , 16 Zhang Y. Wang Q. Yi S. Lin Z. Wang C. Chen Z. Jiang L. 4D printing of magnetoactive soft materials for on-demand magnetic actuation transformation. , 17 Xu T. Zhang J. Salehizadeh M. Onaizah O. Diller E. Millimeter-scale flexible robots with programmable three-dimensional magnetization and motions. , 18 Kim Y. Yuk H. Zhao R. Chester S.A. Zhao X. Printing ferromagnetic domains for untethered fast-transforming soft materials. These machines can achieve multimodal locomotion 14 Hu W. Lum G.Z. Mastrangeli M. Sitti M. Small-scale soft-bodied robot with multimodal locomotion. , 15 Xia N. Jin B. Jin D. Yang Z. Pan C. Wang Q. Ji F. Iacovacci V. Majidi C. Ding Y. Zhang L. Decoupling and reprogramming the wiggling motion of midge larvae using a soft robotic platform. (swimming, climbing, rolling, walking, and jumping) or predefined complex three-dimensional (3D) shape changing 16 Zhang Y. Wang Q. Yi S. Lin Z. Wang C. Chen Z. Jiang L. 4D printing of magnetoactive soft materials for on-demand magnetic actuation transformation. , 17 Xu T. Zhang J. Salehizadeh M. Onaizah O. Diller E. Millimeter-scale flexible robots with programmable three-dimensional magnetization and motions. , 18 Kim Y. Yuk H. Zhao R. Chester S.A. Zhao X. Printing ferromagnetic domains for untethered fast-transforming soft materials. driven by induced magnetic torque under corresponding magnetic fields. Such untethered miniature machines can gain access to confined and hard-to-reach spaces, such as cavities or organs within the human body, 19 Chen W. Sun M. Fan X. Xie H. Magnetic/pH-sensitive double-layer microrobots for drug delivery and sustained release. , 20 Chen W. Chen X. Yang M. Li S. Fan X. Zhang H. Xie H. Triple-configurational magnetic robot for targeted drug delivery and sustained release. and accomplish multiple tasks including targeted cargo delivery, 17 Xu T. Zhang J. Salehizadeh M. Onaizah O. Diller E. Millimeter-scale flexible robots with programmable three-dimensional magnetization and motions. non-invasive medical diagnosis, 4 Liu X. Yang Y. Inda M.E. Lin S. Wu J. Kim Y. Chen X. Ma D. Lu T.K. Zhao X. Magnetic living hydrogels for intestinal localization, retention, and diagnosis. , 21 Recent progress in flexible tactile sensor systems: from design to application. , 22 A brief review of mechanical designs for additive manufactured soft materials. , 23 Wong T.H. Yiu C.K. Zhou J. Song Z. Liu Y. Zhao L. Yao K. Park W. Yoo W. Song E. et al. Tattoo-like epidermal electronics as skin sensors for human machine interfaces. , 24 Li Y. Wang P. Meng C. Chen W. Zhang L. Guo S. A brief review on miniature flexible and soft tactile sensors for interventional catheter applications. and therapy for healing ulcers. 25 Wang B. Chan K.F. Yuan K. Wang Q. Xia X. Yang L. Ko H. Wang Y.-X.J. Sung J.J.Y. Chiu P.W.Y. Zhang L. Endoscopy-assisted magnetic navigation of biohybrid soft microrobots with rapid endoluminal delivery and imaging. However, these elastomer-based composites are difficult to navigate through very narrow and confined spaces with openings smaller than the dimensions of the material. This is due to the solid nature and limited deformability of such elastic material systems. In contrast to these solid material systems, magnetically actuated liquid-based machines 26 Zhang Y. Jiang S. Hu Y. Wu T. Zhang Y. Li H. Li A. Zhang Y. Wu H. Ding Y. et al. Reconfigurable magnetic liquid metal robot for high-performance droplet manipulation. , 27 Sun M. Tian C. Mao L. Meng X. Shen X. Hao B. Wang X. Xie H. Zhang L. Reconfigurable magnetic slime robot: deformation, adaptability, and multifunction. , 28 He X. Ni M. Wu J. Xuan S. Gong X. Hard-magnetic liquid metal droplets with excellent magnetic field dependent mobility and elasticity. , 29 Li X. Li S. Lu Y. Liu M. Li F. Yang H. Tang S.Y. Zhang S. Li W. Sun L. Programmable digital liquid metal droplets in reconfigurable magnetic fields. , 30 Li F. Shu J. Zhang L. Yang N. Xie J. Li X. Cheng L. Kuang S. Tang S.-Y. Zhang S. et al. Liquid metal droplet robot. , 31 Shu J. Tang S.Y. Feng Z. Li W. Li X. Zhang S. Unconventional locomotion of liquid metal droplets driven by magnetic fields. exhibit much greater morphological adaptability for tasks such as passing through narrow and constrained spaces. For example, Fan et al. 32 Fan X. Dong X. Karacakol A.C. Xie H. Sitti M. Reconfigurable multifunctional ferrofluid droplet robots. presented the ability for miniature droplets of ferrofluid to perform reconfigurable morphological transformation including elongation, splitting, merging, and transition into a ring shape. Kim and colleagues 33 Jeong J. Lee J.B. Chung S.K. Kim D. Electromagnetic three dimensional liquid metal manipulation. 34 Jeon J. Lee J.-B. Chung S.K. Kim D. Magnetic liquid metal marble: characterization of lyophobicity and magnetic manipulation for switching applications. investigated the magnetic-field-driven motion of ferromagnetic liquid metal (LM) droplets through microfluidic channels embedded within a soft silicone elastomer matrix. Li et al. 35 Li F. Kuang S. Li X. Shu J. Li W. Tang S.-Y. Zhang S. Magnetically- and electrically-controllable functional liquid metal droplets. reported that the precise control and climbing locomotion of functional LM is demonstrated by the interworking of both electric and magnetic fields simultaneously. Liu et al. 36 Liu M. Wang Y. Kuai Y. Cong J. Xu Y. Piao H.G. Pan L. Liu Y. Magnetically powered shape-transformable liquid metal micromotors. demonstrated LM micromachines capable of dramatic morphological transformation in an aqueous environment. Magnetically actuated micromachine swarms also express a liquid-like property in terms of the morphological transformation of the whole group through their unique collective behaviors. 37 Fan X. Sun M. Sun L. Xie H. Ferrofluid droplets as liquid microrobots with multiple deformabilities. , 38 Xie H. Sun M. Fan X. Lin Z. Chen W. Wang L. Dong L. He Q. Reconfigurable magnetic microrobot swarm: multimode transformation, locomotion, and manipulation. For example, Sun et al. 39 Sun M. Fan X. Tian C. Yang M. Sun L. Xie H. Swarming microdroplets to a dexterous micromanipulator. demonstrated ferrofluid micromachine swarms that could navigate through multiple terrains such as curved grooves and narrow channels and achieve a dexterous “octopus arm”-like micromanipulator to grasp a targeted object through a confined space. However, such liquid-based machines or liquid-like micromachine swarms provide limited load capacity because of the poor mechanical strength of fluidic bodies. 40 Fluid-like soft machines with liquid metal. Moreover, although magnetically actuated liquids exhibit excellent morphological flexibility and adaptability, high-speed locomotion is still challenging to achieve because of their low mobility and requirements for sophisticated systems to control the magnetic field. To both support high load capacity and achieve morphological adaptability, natural organisms typically rely on dynamic s