{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T13:37:36Z","timestamp":1785418656680,"version":"3.56.0"},"reference-count":32,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T00:00:00Z","timestamp":1777939200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004329","name":"Slovenian Research and Innovation Agency","doi-asserted-by":"crossref","award":["P2-0028"],"award-info":[{"award-number":["P2-0028"]}],"id":[{"id":"10.13039\/501100004329","id-type":"DOI","asserted-by":"crossref"}]},{"award":["P2-0028"],"award-info":[{"award-number":["P2-0028"]}],"id":[{"id":"https:\/\/ror.org\/059bp8k51","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Micromachines"],"abstract":"<jats:p>The new method proposed in this study, featuring a one-finger gripper, uses three types of forces\u2014van der Waals force, capillary force, and coupling force due to ice\u2014to grip and release microobjects to submillimeter-sized objects (5 to 300 \u00b5m). The gravitational force of an object can be neglected in the case of microobjects, but this is not the case for submillimeter-sized objects. This is the first reason that we use the coupling force due to ice; the second reason is that the shape of a micro- or submillimeter-sized object does not matter in this case. The usage of all three forces yields greater versatility regarding objects of different sizes and shapes and, consequently, greater overall reliability in gripping or releasing compared with methods that use only one or two of the mentioned forces. In this study, the laboratory set-up involved the active control of the temperature for both the one-finger gripper and the releasing surface for objects from \u221225 \u00b0C to 40 \u00b0C in a closed dust-free chamber in atmospheric air at relative humidity (RH) = 30%. A relatively low RH was achieved with the RH controller, enabling the release or grip procedures to last approx. 2\u20133 s for microobjects and 6 s for submillimeter-sized objects with the same equipment.<\/jats:p>","DOI":"10.3390\/mi17050573","type":"journal-article","created":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T10:01:30Z","timestamp":1777975290000},"page":"573","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["One-Finger Gripper for Microobjects to Submillimeter-Sized Objects Based on Temperatures of Dew and Freezing Points"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-1158-9242","authenticated-orcid":false,"given":"Bo\u017eidar","family":"Bratina","sequence":"first","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9604-0554","authenticated-orcid":false,"given":"Du\u0161an","family":"Fister","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jernej","family":"Nezman","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3887-0103","authenticated-orcid":false,"given":"Jakob","family":"\u0160afari\u010d","sequence":"additional","affiliation":[{"name":"EMSISO d.o.o, Pesnica pri Mariboru 20A, 2211 Pesnica pri Mariboru, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6856-7992","authenticated-orcid":false,"given":"Riko","family":"\u0160afari\u010d","sequence":"additional","affiliation":[{"name":"Faculty of Electrical Engineering and Computer Science, University of Maribor, 2000 Maribor, Slovenia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"156","DOI":"10.1103\/PhysRevLett.24.156","article-title":"Acceleration and Trapping of Particles by Radiation Pressure","volume":"24","author":"Ashkin","year":"1970","journal-title":"Phys. Rev. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"288","DOI":"10.1364\/OL.11.000288","article-title":"Observation of a single-beam gradient force optical trap for dielectric particles","volume":"11","author":"Ashkin","year":"1986","journal-title":"Opt. Lett."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"12414","DOI":"10.1364\/OE.27.012414","article-title":"Optical attraction of strongly absorbing particles in liquids","volume":"27","author":"Zhang","year":"2019","journal-title":"Opt. Express"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1007\/s13320-021-0639-0","article-title":"Dynamic Analysis and Simulation of an Optically Levitated Rotating Ellipsoid Rotor in Liquid Medium","volume":"12","author":"Zhu","year":"2022","journal-title":"Photonic Sens."},{"key":"ref_5","first-page":"1","article-title":"Design of a Microforce Sensing Gripper for Micro\/Nano Manipulation Based on Optical Fiber Sensing","volume":"Volume 10","author":"Zang","year":"2023","journal-title":"Proceedings of the 2023 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS)"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1563","DOI":"10.1007\/s00542-019-04696-6","article-title":"A novel design and fabrication of a micro-gripper for manipulation of micro-scale parts actuated by a bending piezoelectric","volume":"26","author":"Mehrabi","year":"2020","journal-title":"Microsyst. Technol."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Fontana, G., Iacono, N., Negri, S.P., and Papadia, G. (2023). Design of a Multi-Mode Hybrid Micro-Gripper for Surface Mount Technology Component Assembly. Micromachines, 14.","DOI":"10.3390\/mi14071464"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1038\/s41378-024-00821-2","article-title":"A microgripper based on electrothermal Al\u2013SiO2 bimorphs","volume":"10","author":"Yang","year":"2024","journal-title":"Microsyst. Nanoeng."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"e08338","DOI":"10.1002\/advs.202508338","article-title":"Nanoporous Capillary Gripper for Ultragentle Micro-Object Manipulation","volume":"12","author":"Kim","year":"2025","journal-title":"Adv. Sci."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Fukuchi, E., Sako, R., Watanabe, N., Kusui, E., and Fuchiwaki, O. (2022). Capillary Force Gripper with a Polygonal Nozzle for Pick & Place and Rotation of 1 mm Objects. Proceedings of the Asian Society for Precision Engineering and Nanotechnology (ASPEN 2022), Research Publishing Services.","DOI":"10.3850\/978-981-18-6021-8_OR-09-0017.html"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1324","DOI":"10.1109\/LRA.2021.3138519","article-title":"Double-Nozzle Capillary Force Gripper for Cubical, Triangular Prismatic, and Helical 1-mm-Sized-Objects","volume":"7","author":"Tanaka","year":"2022","journal-title":"IEEE Robot. Autom. Lett."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"754","DOI":"10.1039\/C9SM02093D","article-title":"Pick up and release of micro-objects: A motion-free method to change the conformity of a capillary contact","volume":"16","author":"Iazzolino","year":"2020","journal-title":"Soft Matter"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"045006","DOI":"10.1088\/1361-6439\/ab05a9","article-title":"A release method of micro-objects based on the liquid bridge configuration","volume":"29","author":"Zhang","year":"2019","journal-title":"J. Micromech. Microeng."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Lambert, P. (2007). Capillary Forces in Microassembly, Springer.","DOI":"10.1007\/978-0-387-71089-1"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3695","DOI":"10.1109\/LRA.2019.2927939","article-title":"Capillary Force Gripper for Complex-Shaped Micro-Objects with Fast Droplet Forming by On\u2013Off Control of a Piston Slider","volume":"4","author":"Hagiwara","year":"2019","journal-title":"IEEE Robot. Autom. Lett."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"115011","DOI":"10.1088\/0960-1317\/25\/11\/115011","article-title":"A single-probe capillary microgripper induced by dropwise condensation and inertial release","volume":"25","author":"Fan","year":"2015","journal-title":"J. Micromech. Microeng."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Uran, S., \u0160afari\u010d, R., and Bratina, B. (2017). Reliable and Accurate Release of Micro-Sized Objects with a Gripper that Uses the Capillary-Force Method. Micromachines, 8.","DOI":"10.3390\/mi8060182"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"025001","DOI":"10.1088\/0960-1317\/20\/2\/025001","article-title":"Dynamic modelling for a submerged freeze microgripper using thermal networks","volume":"20","author":"Gauthier","year":"2010","journal-title":"J. Micromech. Microeng."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"784","DOI":"10.1109\/IROS.2006.282630","article-title":"Submerged Freeze Gripper to Manipulate Micro-objects","volume":"Volume 10","author":"Walle","year":"2006","journal-title":"Proceedings of the 2006 IEEE\/RSJ International Conference on Intelligent Robots and Systems"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1088\/0960-1317\/14\/2\/015","article-title":"Freeze tweezer to manipulate mini\/micro objects","volume":"14","author":"Liu","year":"2004","journal-title":"J. Micromech. Microeng."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"095008","DOI":"10.1088\/0960-1317\/18\/9\/095008","article-title":"A convective cooling enabled freeze tweezer for manipulating micro-scale objects","volume":"18","author":"Yang","year":"2008","journal-title":"J. Micromech. Microeng."},{"key":"ref_22","first-page":"438","article-title":"A new ice gripper based on thermoelectric effect for manipulating micro objects","volume":"Volume 8","author":"Ru","year":"2007","journal-title":"Proceedings of the 2007 7th IEEE Conference on Nanotechnology (IEEE NANO)"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1049\/mnl.2012.0812","article-title":"Variable contact surface gripping technique for microsized objects","volume":"8","author":"Lukman","year":"2013","journal-title":"Micro Nano Lett."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"085012","DOI":"10.1088\/0960-1317\/24\/8\/085012","article-title":"One-finger gripper based on the variable van der Waals force used for a single nano\/micro-sized object","volume":"24","author":"Lukman","year":"2014","journal-title":"J. Micromech. Microeng."},{"key":"ref_25","unstructured":"Sears, F.W., and Zemansky, M.W. (1963). University Physics, Addison-Wesley. [3rd ed.]."},{"key":"ref_26","first-page":"15","article-title":"Determination of nano-roughness for micro-objects by measuring the van der Waals force","volume":"14","author":"Bratina","year":"2019","journal-title":"Adv. Prod. Eng. Manag."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"381","DOI":"10.1080\/10798587.2012.10643250","article-title":"Adaptive Positioning Of Mems Production System with Nano\u2014Resolution","volume":"18","year":"2012","journal-title":"Intell. Autom. Soft Comput."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"3157","DOI":"10.1021\/la7036444","article-title":"Comparison between Two Capillary Forces Models","volume":"24","author":"Lambert","year":"2008","journal-title":"Langmuir"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"10992","DOI":"10.1021\/la0517639","article-title":"Capillary Forces between Two Spheres with a Fixed Volume Liquid Bridge: Theory and Experiment","volume":"21","author":"Rabinovich","year":"2005","journal-title":"Langmuir"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"8489","DOI":"10.1039\/C4SM01826E","article-title":"Evaporation of a capillary bridge between a particle and a surface","volume":"10","author":"Neeson","year":"2014","journal-title":"Soft Matter"},{"key":"ref_31","unstructured":"Israelachvili, J.N. (2011). Intermolecular and Surface Forces, Academic Press."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"234103","DOI":"10.1063\/1.2139848","article-title":"Capillary force with a concave probe-tip for micromanipulation","volume":"87","author":"Saito","year":"2005","journal-title":"Appl. Phys. Lett."}],"container-title":["Micromachines"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-666X\/17\/5\/573\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T04:20:12Z","timestamp":1778127612000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-666X\/17\/5\/573"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,5,5]]},"references-count":32,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2026,5]]}},"alternative-id":["mi17050573"],"URL":"https:\/\/doi.org\/10.3390\/mi17050573","relation":{},"ISSN":["2072-666X"],"issn-type":[{"value":"2072-666X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,5,5]]}}}