Article
Chemistry, Multidisciplinary
Jeong Hun Choi, Nitee Kumari, Jung Hun Koo, Amit Kumar, Changhoon Lee, Ji Hoon Shim, Zhipeng Wang, Sang Ho Oh, In Su Lee
Summary: This study presents a facile method for the synthesis of unconventional amorphous hollow-silica nanostructures with controllable surface curvatures, symmetries, and interior architectures. The key role of transiently in situ crystallized metal coordination complexes as a template is identified for the differential silica growth that produces different nanostructures. Furthermore, crystal-like well-defined polygonal h-SiNSs can be assembled into highly ordered mesoscale materials with customizable cavities and nanospaces, which differ from conventionally assembled materials.
Article
Chemistry, Multidisciplinary
Joe G. Donaldson, Peter Schall, Laura Rossi
Summary: The study demonstrates a novel approach to material design by utilizing preassembled magnetic building blocks that can self-organize into complex structures. Different shapes of magnetic particles produce varied magnetic configurations under fixed conditions and can form highly reproducible cluster structures.
Article
Chemistry, Multidisciplinary
Tongtao Li, Angang Dong, Siyu Wan, Xiangyun Xi, Heyang Zhang, Jing Ning, Ziyue Zheng, Zhebin Zhang, Ying Long, Yuwei Deng, Pengshuo Fan, Dong Yang
Summary: This contribution describes the self-assembly of colloidal nanodumbbells (NDs) with tunable shapes within cylindrical channels. The intrinsic concave geometry of NDs endows them with peculiar packing and interlocking behaviors, leading to a variety of super-structures. A mechanistic investigation reveals that the phase behavior of NDs under strong confinement can be rationalized by the entropy-driven maximization of the packing efficiency. An empirical phase diagram is generated based on the experimental results, which could provide general guidance in the design of intended superstructures from NDs. This study provides essential insight into how the interplay between the particle shape and confinement conditions can be exploited to direct the orientationally ordered assembly of concave nanoparticles into unusual superlattices.
Article
Chemistry, Multidisciplinary
Joseph R. Maestas, Fuduo Ma, Ning Wu, David T. Wu
Summary: This study explores the mechanism of colloidal particles assembling into quasi-two-dimensional materials under externally applied electric fields. The research identifies previously unobserved structures and proposes a simple method to control the ratio of particles between different planes.
Article
Biochemistry & Molecular Biology
Misun Kang, Jong-tak Lee, Jae Young Bae
Summary: Formaldehyde emitted from household products is harmful to human health. This study compares the formaldehyde adsorption characteristics of mesoporous and mesoporous hollow silicas synthesized with or without a calcination process. The mesoporous hollow silica synthesized without a calcination process has the best adsorption performance, followed by the mesoporous hollow silica synthesized with a calcination process and mesoporous silica. This research demonstrates the potential of mesoporous hollow silica as an effective support for harmful gas adsorption.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Vinicius Bueno, Alessandro Bosi, Tiziana Tosco, Subhasis Ghoshal
Summary: This study investigated the transport of two different structures of SiO2 NPs under different conditions and found that pH and ionic strength significantly affect their mobility. Porous hollow SiO2 NPs exhibited greater deposition in sand-packed columns compared to solid SiO2 NPs, attributed to their greater surface roughness and specific surface area.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Applied
Jing Cui, Fei-Fei Xing, Hao Luo, Jie-Qiong Qin, Yan Li, Yonghui Zhong, Facai Wei, Jianwei Fu, Chengbin Jing, Jiangong Cheng, Zhong-Shuai Wu, Shaohua Liu
Summary: A universal dual-colloid interface co-assembly strategy was proposed to fabricate hollow mesoporous polypyrrole nano-bowls, demonstrating excellent universality for synthesizing other hollow mesoporous polymers. The structurally optimized polypyrrole nano-bowl showed high specific surface area and large capacitance, leading to high-performance microscale supercapacitive devices.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Materials Science, Ceramics
Omer Guler, Veyis Selen, Oykum Basgoz, Hasan Safa, Ibrahim S. Yahia
Summary: Silica aerogel-hollow silica microsphere sandwich structure was successfully synthesized as an adsorbent for dye removal from aqueous solutions, showing high adsorption efficiency and potential for further development with increased adsorption capacity.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Wei Hou, Zhiwu Lei, Eming Hu, Hongqiang Wang, Qingliang Wang, Rui Zhang, Hui Li
Summary: The study investigated the co-transport mechanisms of UC and cSiO(2) in a saturated porous medium with different ionic strength, pH, and UC concentration. It revealed factors influencing the transport efficiency, such as the deposition of cSiO(2) on quartz sand at low UC concentrations.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Electrical & Electronic
Hsiang-Chi Chien, Shu-Yang Lin, Erh-Ching Chen, Tzong-Ming Wu
Summary: Organically modified hollow silica nanofibers were synthesized and used as the core for polyimide composites. The composites were characterized using FTIR, SEM, and TEM. The results showed successful synthesis of polyimide through two-step polymerization, and an increase in thermal stability and decrease in dielectric constants with the addition of modified hollow silica nanofibers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Energy & Fuels
Wei Jiang, Jin Xiao, Xiang Gao, Xin An, Yupeng Leng, Linhua Zhu, Wenshuai Zhu, Huaming Li
Summary: In this study, a hollow silica confined defective molybdenum oxide catalyst was successfully prepared, demonstrating higher activity and desulfurization efficiency compared to a solid silica-supported catalyst. Oxygen defects were found to play a positive role in promoting oxidation reactions, and the catalyst exhibited good stability and selectivity, making it a promising candidate for industrial applications.
Article
Chemistry, Multidisciplinary
Joshua E. Kauffman, Benjamin M. Tansi, Christopher LaSalle, Raj Kumar Manna, Oleg E. Shklyaev, Anna C. Balazs, Ayusman Sen
Summary: The system described in the article utilizes the photothermal properties of plasmonic nanoparticles to achieve directed motility and separation of larger microparticles, with the ability to relocate particle clusters and separate particles of different sizes on an inclined plane using thermal convection.
Article
Chemistry, Physical
Uyen Tu Lieu, Natsuhiko Yoshinaga
Summary: In this study, we propose an optimization method for the inverse structural design of self-assembly of anisotropic patchy particles. Our method can handle arbitrary symmetries of the patch and successfully estimate the potential parameters for target structures such as square lattice, kagome lattice, and dodecagonal quasicrystal.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Congcong Rong, Jianan Zhang, Song Chen, Yixuan Wang, Toshiyuki Ikoma, Xiaona Li, Weiyi Chen
Summary: Silica hollow microspheres were prepared as biocompatible cell carriers using emulsified gelatin microspheres as sacrificial templates. SEM observations showed their spherical morphology with a hollow structure and a diameter of 50-200 μm. FT-IR spectrum revealed the presence of Si-O-Si bonds. Gelatin microspheres served as supporting matrix and sacrificial templates for the formation of hollow structure. The silica hollow microspheres were found to be biocompatible and supported cell attachment and proliferation when seeded with osteoblast MC3T3-E1 cells, indicating their potential as biocompatible cell carriers.
Article
Biochemistry & Molecular Biology
Horacio Serna, Wojciech T. Gozdz, Eva G. Noya
Summary: Periodic modulated phases, such as cluster-crystal and lamellar phases, can be promoted by confinement in narrow slit pores, with the ability to remain stable at higher temperatures compared to the bulk system. Particle diffusion under confinement shows a complex dependence on pore width and density, resulting in varied diffusion coefficient values compared to the bulk system.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Obstetrics & Gynecology
Stephen S. Johnston, Brian Po-Han Chen, Akhil Nayak, Stephanie Hsiao Yu Lee, Michelle Costa, Giovanni A. Tommaselli
Summary: A comparative study on cesarean delivery skin closure techniques found that using 2-octyl cyanoacrylate plus polymer mesh tape (2OPMT) resulted in lower rates of complications and infections, as well as shorter hospital stays and lower total costs compared to skin staples plus waterproof wound dressings (SSWWD).
JOURNAL OF MATERNAL-FETAL & NEONATAL MEDICINE
(2021)
Article
Cardiac & Cardiovascular Systems
Masahiko Goya, Diana Frame, Larry Gache, Yoko Ichishima, Daiane Oliveira Tayar, Laura Goldstein, Stephanie Hsiao Yu Lee
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2020)
Article
Cardiac & Cardiovascular Systems
Michael E. Field, Michael R. Gold, Matthew R. Reynolds, Laura Goldstein, Stephanie Hsiao Yu Lee, Iftekhar Kalsekar, Paul Coplan, Charlene Wong, Rahul Khanna, Jeffrey R. Winterfield
JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY
(2020)
Article
Multidisciplinary Sciences
Marc Z. Miskin, Alejandro J. Cortese, Kyle Dorsey, Edward P. Esposito, Michael F. Reynolds, Qingkun Liu, Michael Cao, David A. Muller, Paul L. McEuen, Itai Cohen
Article
Biophysics
Rebecca M. Irwin, Tianyu Gao, Alexander J. Boys, Kyla Ortved, Itai Cohen, Lawrence J. Bonassar
Summary: The study found that the interface slope had a stronger correlation with local tissue strains under compressive and shear loading, compared to current histological integration assessments and local compositional measures. Therefore, controlling interface geometry at the time of surgery is important for cartilage repair integration and long-term healing.
JOURNAL OF BIOMECHANICS
(2021)
Article
Robotics
Qingkun Liu, Wei Wang, Michael F. Reynolds, Michael C. Cao, Marc Z. Miskin, Tomas A. Arias, David A. Muller, Paul L. McEuen, Itai Cohen
Summary: This new class of micrometer-scale shape-memory actuators function through the electrochemical oxidation/reduction of a platinum surface, allowing for bending with the smallest radius of curvature, fast operation (<100 milliseconds), and operation within the electrochemical window of water to avoid bubble generation. These actuators have the potential to be used in adaptive microscale structures, bio-implantable devices, and microscopic robots.
Article
Physics, Multidisciplinary
Itay Griniasty, Cyrus Mostajeran, Itai Cohen
Summary: This research demonstrates the design of a material that can deform into multiple surface geometries upon different activations by applying anisotropic deformation inhomogeneously. This development opens the door to fabricating machines that can perform complex tasks through cyclic transitions between multiple shapes, as shown by the design of a simple swimmer capable of moving through a fluid at low Reynolds numbers.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Thomas Wyse Jackson, Jonathan Michel, Pancy Lwin, Lisa A. Fortier, Moumita Das, Lawrence J. Bonassar, Itai Cohen
Summary: This study presents experiments and theory that explain the structural origins of the shear properties of articular cartilage through the mechanical interdependence of collagen and aggrecan networks in its extracellular matrix. The study also highlights the importance of slight changes in collagen and aggrecan concentrations near the cartilage surface, which can significantly weaken its modulus and potentially lead to tissue collapse.
Article
Robotics
Michael F. Reynolds, Alejandro J. Cortese, Qingkun Liu, Zhangqi Zheng, Wei Wang, Samantha L. Norris, Sunwoo Lee, Marc Z. Miskin, Alyosha C. Molnar, Itai Cohen, Paul L. McEuen
Summary: This study develops an integration process and builds microscopic robots controlled by complementary metal oxide semiconductor electronics. These robots, sized from 100 to 250 micrometers, are powered by light and can respond to optical commands. This work lays the foundation for the development of future autonomous microscopic robots.
Article
Chemistry, Physical
Nuno A. M. Araujo, Liesbeth M. C. Janssen, Thomas Barois, Guido Boffetta, Itai Cohen, Alessandro Corbetta, Olivier Dauchot, Marjolein Dijkstra, William M. Durham, Audrey Dussutour, Simon Garnier, Hanneke Gelderblom, Ramin Golestanian, Lucio Isa, Gijsje H. Koenderink, Hartmut Loewen, Ralf Metzler, Marco Polin, C. Patrick Royall, Andela Saric, Anupam Sengupta, Cecile Sykes, Vito Trianni, Idan Tuval, Nicolas Vogel, Julia M. Yeomans, Iker Zuriguel, Alvaro Marin, Giorgio Volpe
Summary: Self-organisation is the spontaneous emergence of spatio-temporal structures and patterns from the interaction of smaller individual units. Confinement can mediate and control self-organisation by limiting the translational and rotational degrees of freedom, acting as a catalyst or inhibitor. By constraining the self-organisation process in soft-matter systems, confinement can actively steer the emergence or suppression of collective phenomena in space and time.
Article
Multidisciplinary Sciences
Samuel C. Whitehead, Sofia Leone, Theodore Lindsay, Matthew R. Meiselman, Noah J. Cowan, Michael H. Dickinson, Nilay Yapici, David L. Stern, Troy Shirangi, Itai Cohen
Summary: In this study, it was found that stabilization reflexes during fly flight are implemented by a proportional-integral (PI) controller. The b1 and b2 motor units of the fly's steering muscle system were identified to modulate the angular displacement and angular velocity, respectively. This finding reveals the organizational principle of muscles in flight control in insects.
Article
Multidisciplinary Sciences
Nanqi Bao, Qingkun Liu, Michael F. Reynolds, Marc Figueras, Evangelos Smith, Wei Wang, Michael C. Cao, David A. Muller, Manos Mavrikakis, Itai Cohen, Paul L. McEuen, Nicholas L. Abbott
Summary: Biological systems convert chemical energy into mechanical work using protein catalysts. Synthetic chemomechanical systems have been slow and require high temperatures, but this study introduces a bioinspired chemical strategy that generates surface stresses to drive microactuation at ambient conditions. This strategy can integrate photochemically controlled reactions and reconfigure microstructures.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Mechanics
Meera Ramaswamy, Itay Griniasty, Danilo B. Liarte, Abhishek Shetty, Eleni Katifori, Emanuela Del Gado, James P. Sethna, Bulbul Chakraborty, Itai Cohen
Summary: Nearly all dense suspensions undergo dramatic and abrupt thickening transitions in their flow behavior when sheared at high stresses. In this study, we propose a complete theory of viscosity and find that the viscosity of two different systems can be collapsed onto a single universal curve. By incorporating microscale particle interactions into a scaling variable, we gain insights into the fundamental physical aspects of shear thickening transition. This research is of great importance for understanding the rheological behavior of fluids.
JOURNAL OF RHEOLOGY
(2023)
Article
Multidisciplinary Sciences
Teaya Yang, David Hathcock, Yuchao Chen, Paul L. McEuen, James P. Sethna, Itai Cohen, Itay Griniasty
Summary: We propose a design paradigm for multistate machines that utilizes bifurcations of energy landscapes to organize state transitions, allowing for quick and significant changes in system states through small control parameter variations. This approach is attractive due to its robustness and insensitivity to fabrication errors and noise, and we develop an efficient algorithm to search for component interactions that result in these bifurcation structures. Proof of concept is demonstrated through the design of magnetoelastic machines guided by magnetic energy landscapes, showing the ability to achieve multiple transition pathways between states near bifurcations. This approach has significant implications, particularly in the fields of soft robotics and microscale design where traditional macroscale designs are challenging to implement.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Physical
Eric M. Schwen, Meera Ramaswamy, Chieh-Min Cheng, Linda Jan, Itai Cohen
