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Japanese About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGiving StudentsAlumniParents &#038; GuardiansFaculty &#038; StaffMedia Academic ListingsContact UsCampus AccessEmergency Notice Accessibility &#038; CopyrightSitemapPrivacy PolicyMyWasedaSocial MediaEmploymentAnnual Plans・ReportsEquality, Diversity &#038; Inclusion Syllabus Search Researcher Database Waseda University Repository Seeds Database Waseda E-Resource Portal Cultural Resource Database Announcements Mar 28, 2024 Schedule for Spring 2024 entrance ceremonies Mar 21, 2024 Schedule for Spring 2024 graduation ceremonies Dec 12, 2023 Spring 2024 graduation and entrance ceremonies Sep 19, 2023 Schedule for Autumn 2023 Entrance Ceremonies Sep 7, 2023 Schedule for Autumn 2023 Graduation Ceremonies Waseda University 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, JAPAN About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGive Emergencynotice About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGive Emergencynotice Home News Share Versatile, High-Speed, and Efficient Crystal Actuation with Photothermally Resonated Natural Vibrations Thu, Apr 20, 2023 Tags Press Release Research Share Versatile, High-Speed, and Efficient Crystal Actuation with Photothermally Resonated Natural Vibrations Researchers from Japan observe large bending along with high-speed resonated natural vibrations in anisole crystals when irradiated with pulsed ultraviolet light Mechanically responsive molecular crystals are extremely useful in soft robotics, which requires a versatile actuation technology. Crystals driven by the photothermal effect are particularly promising for achieving high-speed actuation. However, the response (bending) observed in these crystals is usually small. Now, scientists from Japan address this issue by inducing large resonated natural vibrations in anisole crystals with UV light illumination at the natural vibration frequency of the crystal. Researchers from Japan have demonstrated high-frequency and large resonated natural vibrations in anisole single crystals driven by pulsed UV radiation at the natural vibration frequency of the crystal. Their research has immense potential for advancing the field of soft robotics and versatile actuation technology. Every material possesses a unique natural vibration frequency such that when an external periodic force is applied to this material close to this frequency, the vibrations are greatly amplified. In the parlance of physics, this phenomenon is known as “resonance.” Resonance is ubiquitous in our daily life, and, depending on the context, could be deemed desirable or undesirable. For instance, musical instruments like the guitar relies on resonance for sound amplification. On the other hand, buildings and bridges are more likely to collapse under an earthquake if the ground vibration frequency matches their natural frequency. Interestingly, natural vibration has not received much attention in material actuation, which relies on the action of mechanically responsive crystals. Versatile actuation technologies are highly desirable in the field of soft robotics. Although crystal actuation based on processes like photoisomerisation and phase transitions have been widely studied, these processes lack versatility since they require specific crystals to work. One way to improve versatility is by employing photothermal crystals, which show bending due to light-induced heating. While promising for achieving high-speed actuation, the bending angle is usually small (<0.5°), making the actuation inefficient. Now, a team of scientists from Waseda University and Tokyo Institute of Technology in Japan has managed to overcome this drawback with nothing more than the age-old phenomenon of resonated natural vibration. The team, led by Dr. Hideko Koshima from Waseda University in Japan, used 2,4-dinitroanisole β-phase crystals (1β) to demonstrate large-angle photothermally resonated high-speed bending induced by pulsed UV irradiation. Their research was published in Volume 14 of Nature Communications and made available online on March 13, 2023. “Initially, the goal of this research was to create crystals that bend largely due to the photothermal effect. Therefore, we chose 2,4-dinitroanisole (1) β-phase crystal (1β), which has a large thermal expansion coefficient,” explains Koshima, speaking of the team’s motivation behind the study. “We serendipitously discovered fast and small natural vibration induced by the photothermal effect. Furthermore, we achieved high-speed and large bending by photothermally resonating the natural vibration.” In their work, the team first cooled a methanol solution of commercially available anisole 1 to obtain hexagonal, rod-shaped 1β single crystals. To irradiate them with UV light, they used a pulsed UV laser with a wavelength of 375 nm and observed the bending response of the crystal using a digital high-speed microscope. They found that the rod-shaped 1β crystals showed, under UV irradiation, a fast natural vibration at 390 Hz with a large photothermal bending of nearly 1°, which is larger than the value of 0.2° previously reported in other crystals. Further, the bending angle due to the natural vibraton increased to nearly 4° when irradiated with pulsed UV light at 390 Hz (same as the crystal’s natural frequency). In addition to this large bending, the team observed a high response frequency of 700 Hz along with the highest energy conversion efficiency recorded till date. These findings were further confirmed through simulations performed by the team. To their excitement, the simulation results showed excellent agreement with experimental data. “Our findings show that any light-absorbing crystal can exhibit high-speed, versatile actuation through resonated natural vibrations. This can open doors to the applications of photothermal crystals, leading eventually to real-life soft robots with high-speed actuation capability and perhaps a society with humans and robots living in harmony,” concludes Koshima. Reference Authors Yuki Hagiwara1, Shodai Hasebe1, Hiroki Fujisawa2, Junko Morikawa2, Toru Asahi1,3 & Hideko Koshima3,* Title of original paper Photothermally induced natural vibration for versatile and high-speed actuation of crystals Journal Nature Communications DOI 10.1038/s41467-023-37086-8 Affiliations 1Graduate School of Advanced Science and Engineering, Waseda University 2School of Materials and Chemical Technology, Tokyo Institute of Technology 3Research Organization for Nano & Life Innovation, Waseda University About Waseda University Located in the heart of Tokyo, Waseda University is a leading private research university that has long been dedicated to academic excellence, innovative research, and civic engagement at both the local and global levels since 1882. The University has produced many changemakers in its history, including nine prime ministers and many leaders in business, science and technology, literature, sports, and film. Waseda has strong collaborations with overseas research institutions and is committed to advancing cutting-edge research and developing leaders who can contribute to the resolution of complex, global social issues. The University has set a target of achieving a zero-carbon campus by 2032, in line with the Sustainable Development Goals (SDGs) adopted by the United Nations in 2015. To learn more about Waseda University, visit https://www.waseda.jp/top/en About Hideko Koshima Dr. Hideko Koshima is an adjunct researcher at Waseda University. She was a professor at Ehime University before moving to Waseda University several years ago. Her research interests are in solid-state organic photochemistry, material chemistry, and chiral chemistry. Over the last decade, her research has focused on mechanical molecular crystals that are actuated by light and heat. Links Dancing with the Light: A New Way to Make Crystals Bend by Shining Light New structural phase transition may broaden the applicability of photo-responsive solids Robotic crystals that walk n’ roll Related Articles Asia : Culture : Education : History : 【Yanai Initiative】Open Talk “Co-Reading Edo Supernatural and Medical Discourse through Asai Ryōi’s “The Peony Lantern.”” (June 21) Jun 10, 2024 International Office : Office of the President : Vision 150 : Bai Xian Asia Institute Marks 10 Years of Building Bridges Across Cultures Jun 10, 2024 Alumni : Vision 150 : Waseda Ranks in Top 12% of Universities Worldwide Jun 6, 2024 Virtual Campus Tour Waseda Campus Toyama Campus Nishiwaseda Campus Tokorozawa Campus Social Media Instagram facebook X youtube LinkedIn Giving Your generosity can make a difference and bring rippling impact No matter the size, every single gift will make a difference in helping students afford an academic experience that will transform their lives, as well as promoting frontline research to resolve complex challenges of the world today. More About Giving Japanese About UsMissionWaseda Vision 150President’s MessageOrganizationHistoryWaseda at a glanceSocial MediaContact UsWASEDA DigestAdmissionsAdmissionsJapanese Language CoursesExchange &#038; Study Abroad ProgramsCampus ToursContact UsAcademicsListingsOnline Courses on edXResearchResearch Press ReleaseResearch ActivitiesResearcher DatabaseTop Global University ProjectTeaching Resource (Elsevier)Campus LifeStudent Contributor ArticlesEquality, Diversity &#038; InclusionHealth, Safety &#038; WellnessIntercultural ExchangeSportsResidential LifeVolunteeringLibraries &#038; MuseumsStudent CirclesScholarships and Student SupportAlumniCollaborationTop Global University Project: Waseda Goes GlobalLatest research and commentary on Covid-1910 Years Since the Tohoku Earthquake and TsunamiGiving StudentsAlumniParents &#038; GuardiansFaculty &#038; StaffMedia Academic ListingsContact UsCampus AccessEmergency Notice Accessibility &#038; CopyrightSitemapPrivacy PolicyMyWasedaSocial MediaEmploymentAnnual Plans・ReportsEquality, Diversity &#038; Inclusion Syllabus Search Researcher Database Waseda University Repository Seeds Database Waseda E-Resource Portal Cultural Resource Database Announcements Mar 28, 2024 Schedule for Spring 2024 entrance ceremonies Mar 21, 2024 Schedule for Spring 2024 graduation ceremonies Dec 12, 2023 Spring 2024 graduation and entrance ceremonies Sep 19, 2023 Schedule for Autumn 2023 Entrance Ceremonies Sep 7, 2023 Schedule for Autumn 2023 Graduation Ceremonies Waseda University 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, JAPAN

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