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Transient shuttle for a widespread neural probe with minimal perturbation

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npj Flexible Electronics 2024年第1期8卷 498-508页

作者： Yeonwook Roh Hyeongseok Kim Eun-A Kim Kyungbin Ji Minji Kang Dohyeon Gong Sunghoon Im Insic Hong Jieun Park Soo Jung Park YiseulBae Jae-Il Park Je-Sung Koh Seungyong Han Eun Jeong Lee Daeshik Kang multiscale bioinspired technology lab Department of Mechanical EngineeringAjou UniversitySuwon-siGyeonggi-doRepublic of Korea Molecular Neurocircuits lab Department of Brain ScienceAjou University School of MedicineSuwon-siGyeonggi-doRepublic of Korea Gwangju Center Korea Basic Science Institute(KBSI)GwangjuRepublic of Korea

Bioelectronic implants in the deep brain provide the opportunity to monitor deep brain activity with potential applications in disease diagnostics and ***,mechanical mismatch between a probe and brain tissue can cause surgical trauma in the brain and limit chronic probe-based monitoring,leading to performance ***,we report a transient shuttle-based probe consisting of a PVA and a mesh-type probe.A rigid shuttle based on PVA implants an ultrathin mesh probe in the target deep brain without a tangle,while creating both a sharp edge for facile penetration into the brain and an anti-friction layer between the probe and brain tissue through dissolving its *** capability to shuttle dissolved materials can exclude the retracted process of the shuttle in the *** dissolution of the shuttle provides a dramatic decrease(~1078-fold)in the stiffness of the probe,which can therefore chronically monitor a wide area of the *** results indicate the ability to use a simplistic design for implantation of wide and deep brain probes while preventing unnecessary damage to the brain and probe degradation during long-term use.

关键词： shuttle neural implantation

Vital role of hydroxyapatite particle shape in regulating the porosity and mechanical properties of the sintered scaffolds

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Journal of Materials Science & technology 2018年第3期34卷 503-507页

作者： Jinchuan Wu Changshun Ruan Yufei Ma Yuanliang Wang Yanfeng Luo lab for bioinspired & Smart Materials College of Bioengineering Chongqing University Key laboratory of Biorheological Science and technology (Chongqing University) Ministry of Education Center for Human Tissue and Organs Degeneration Institute of biomedicine and Biotechnology Shenzhen Institutes of Advanced Technology Chinese Academy of Science

The effect of particle shape on the porosity and compressive strength of porous hydroxyapatite （HA） scaffolds was investigated by sintering the mixture of rod-shaped HA （r-HA） and spherical HA （s-HA） with polyacrylamide used as the sacrificial template. It was found, for the first time, that addition of r-HA into s-HA could exponentially decrease the porosity of sintered HA scaffolds and enhance their compressive strength with the increase of r-HA content. The mechanism, according to the results from scanning electron microscopy and X-ray diffraction, lies in the restriction of s-HA to the grain formation and growth of r-HA during sintering and results in the fusion of r-HA with s-HA. These findings suggest that mixture of r-HA and s-HA might provide a new and facile way to improve the compressive strength of oorous HA scaffolds.

关键词： Spherical/rod-shaped hydroxyapatite Bioceramics Porous materials Sintering Compressive strength

bioinspired membranes for multi-phase liquid and molecule separation

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Science China Chemistry 2019年第1期62卷 14-23页

作者： Jingchong Liu Zhimin Cui Lanlan Hou Dianming Li Yuan Gao Li Shuai Jing Liu Jian Jin Nü Wang Yong Zhao Key laboratory of bioinspired Smart Interfacial Science and technology of Ministry of Education Beijing Key Laboratory of Bioinspired Energy Materials and Devices School of Chemistry Beijing Advanced Innovation Center for Biomedical Engineering Beihang University i-lab CAS Center for Excellence in Nanoscience and CAS Key Laboratory of Nano-Bio Interface Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

Water pollution is a serious problem around the world. It causes the lack of clean drinking water and brings risks to human *** technology has become a competitive candidate to treat the contaminated wastewater due to its high separation efficiency and low energy consumption. In this review, we introduce the recent development of several kinds of bioinspired separation membranes, involving the membrane design and applications. We emphasize the multi-phase liquid separation membranes inspired from nature with special wettability applied for oil/water separation, organic liquids mixture separation, and emulsion separation. After separating multi-phase liquids using these membranes, small molecule pollutants still exist in singlephase liquid. Therefore, we also expand the scope to small molecule-scale separation membranes, such as the nacre-like graphene oxide separation membrane and other nanofiltration membranes. Summary and outlook concerning the future development of separation membranes are also introduced briefly.

关键词： bioinspired superhydrophobic superwettability nanofibers separation membrane

bioinspired Microgroove's Geometry Design and Finite Element Analysis of Bursting Influence Parameters for Metal-based Rupture Diaphragms

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JOURNAL OF BIONIC ENGINEERING 2025年第1期22卷 293-305页

作者： Cao, Peilin Wang, Cong Mu, Zhenzhi Niu, Shichao Liu, Xiao Feng, Xiaosong Liu, Linpeng Han, Zhiwu Cent South Univ Coll Mech & Elect Engn State Key Lab Precis Mfg Extreme Serv Performance Changsha 410083 Peoples R China Jilin Univ Key Lab Bon Engn Minist Educ Changchun 130022 Peoples R China Shanghai Aerosp Equipment Manufacture Co Ltd Shanghai 200245 Peoples R China

Serving as the initiating explosive devices between the propellant tank and the engines, metal-based rupture diaphragms are widely used in ramjet igniters owing to the advantages provided by their simple structure, small size, and low cost. However, the reliability of rupture pressure directly affects the success of engine ignition and rocket launch, which is mainly influenced by factors like material, structure, and residual thickness of the surface notch of the diaphragm. Among those, the geometry of the notch is easy to define and control when compared to the mechanical parameters of the ruptured diaphragm. Thus, to make the diaphragm rupture (1A30 Al) within the required pressure range (0.4 MPa +/- 3.5%) with highly sensitive and reliability, we draw inspiration from the arthropod's force-sensitive slit organ which encompasses curved microgrooves to design a ohm-shaped notch for the rupture diaphragm. Finite element analysis is used to study the relationship between the burst pressure and geometric dimension of the ohm-shaped and bioinspired microgroove. Based on that, metal-based rupture diaphragms are fabricated by femtosecond laser processing technology, followed by rupture tests. Experiment results demonstrate that the practical rupture pressure of the diaphragm is highly consistent with the finite element analysis results, which verifies the effectiveness of the bionic design.

关键词： Rupture diaphragm bioinspired microgroove, ohm-shaped, Finite element analysis Burst pressure

Design,synthesis and characterization of novel poly(urethane-urea) based on a macrodiol from poly(lactic acid) and poly(p-dioxanone)

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Chinese Chemical Letters 2011年第2期22卷 237-240页

作者： Yan Feng Luo Key lab of Biorheological Science and technology (Chongqing University) Ministry of Education College of Bioengineering Chongqing University Chongqing 400030 China Research Center of bioinspired Material Science and Engineering College of Bioengineering Chongqing University Chongqing 400030 China Department of Biology Chongqing University of Science and Technology Chongqing 401331 China Received 29 June 2010

A series of novel poly（urethane-urea）（PUU） was synthesized from poly（lactide-co-p-dioxanone） macrodiol（HO-P（LA-co-PDO）-OH）, hexamethylene diisocyanate（HDI） and butanediamine（BDA）.The obtained PUU,which is recorded as P（LA-co-PDO）-PUU here,may demonstrate enhanced phase separation and thus improved shape memory *** was employed to characterize the copolymers,and the effects of NCO/OH molar ratios on Tg of PUU was investigated by means of differential scanning calorimetry （DSC）.The results revealed the successful synthesis of P（LA-co-PDO）-*** addition,the Tg of P（LA-co-PDO）-PUU increased from 37.9℃to 44.2℃with the increase NCO/OH ratios from 1.1 to *** P（LA-co-PDO）-PUU with Tg close to body temperature will have potential applications as shape memory polymers in biomedical fields,especially in minimally invasive surgery.

关键词： Poly(urethane-urea) Polylactic acid p-Dioxanone Butanediamine Shape memory polymer

Anti-vapor-penetration and condensate microdrop self-transport of superhydrophobic oblique nanowire surface under high subcooling

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Nano Research 2021年第5期14卷 1429-1434页

作者： Rui Wang Feifei Wu Fanfei Yu Jie Zhu Xuefeng Gao Lei Jiang Functional Materials and Interfaces lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei230026China Key laboratory of bioinspired Smart Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China

It is well-known that microscale gaps or defects are ubiquitous and can be penetrated by vapor,resulting in the failure of superhydrophobic effect and undesired condensate flooding under high ***,we propose and demonstrate that such problem can be solved by the oblique arrangement of *** a structure has been demonstrated to own anti-vapor-penetration and microdrop self-transport functions under high subcooling,unaffected by the microscale *** is because vapor molecules can be intercepted by oblique nanowires and preferentially nucleate at near-surface locations,avoiding the penetration of vapor into the microscale ***-formed microdrops can suspend upon the nanowires and have low solid-liquid ***,oblique nanowires can generate asymmetric surface tension and microdrop coalescence can release driving energy,both of which facilitate the microdrop self-removal via sweeping and jumping *** new design idea helps develop more advanced condensation mass and heat transfer interfaces.

关键词： superhydrophobic oblique nanowires anti-vapor-penetration microdrop self-transport

Simulation of lubrication on rough surfaces with multiscale lubrication neural networks

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Science China Technological Sciences 2025年第3期68卷 196-207页

作者： Yihu TANG Li HUANG Limin WU Xianghui MENG School of Mechanical Engineering Shanghai Jiao Tong University National Key laboratory of Marine Engine Science and technology Shanghai Marine Diesel Research Institute

The simulation of lubrication on rough surfaces is essential for the design and optimization of tribological performance. Although the application of physics-informed neural networks(PINNs) in analyzing hydrodynamic lubrication has been increasing, their implementation has predominantly been restricted to smooth surfaces. This limitation arises from the inherent spectral bias of conventional PINN methodologies, which tend to prioritize the learning of low-frequency features,thereby hindering their ability to analyze rough surfaces characterized by high-frequency signals effectively. To date, there have been no reported instances of PINN methodologies being applied to rough surface lubrication. In response to these challenges,this paper presents an innovative multiscale lubrication neural network(MLNN) architecture that incorporates a trainable Fourier feature embedding. By integrating learnable feature embedding frequencies, this architecture is capable of automatically adjusting to various frequency components, thus improving the analysis of rough surface characteristics. The proposed method has been evaluated across a range of surface topographies, with results compared to those derived from the finite element method(FEM). The comparative analysis indicates a high degree of consistency between the MLNN results and those obtained through FEM. Moreover, this novel architecture demonstrates superior performance in terms of both accuracy and computational efficiency when compared to traditional Fourier feature networks that utilize fixed feature embedding frequencies. As a result, the MLNN model represents a more effective tool for the analysis of lubrication on rough surfaces.

关键词： physics-informed neural network Fourier feature embedding multiscale lubrication rough surface

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Aligned carbon nanotube containing scaffolds for neural tissue regeneration

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Neural Regeneration Research 2016年第7期11卷 1062-1063页

作者： Pallavi Gupta Debrupa Lahiri Centre of Nanotechnology Department of Metallurgical and Materials EngineeringIndian Institute of TechnologyRoorkeeIndia Biomaterials and Multiscale Mechanics LabDepartment of Metallurgical and Materials EngineeringIndian Institute of Technology

Neuropathologies include the deterioration and damage of the nervous system,especially neurons present in the brain,spinal cord and peripheral nervous *** or alternations in neurons makes their structure and functionality *** year over 90,000 people get affected by neurodegenerative diseases in the *** all the neurological pathologies,

关键词： nanotube functionality aligned deterioration regeneration neurological fabricating chitosan scaffold walled

Designing Electronic Structures of multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

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Nano-Micro Letters 2025年第1期17卷 439-455页

作者： Zhaobo Feng Chongbo Liu Xin Li Guangsheng Luo Naixin Zhai Ruizhe Hu Jing Lin Jinbin Peng Yuhui Peng Renchao Che Key laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle School of Environmental and Chemical EngineeringNanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Physics and Materials Nanchang UniversityNanchang 330031People’s Republic of China Key laboratory of Nondestructive Testing Ministry of EducationNanchang Hangkong UniversityNanchang 330063People’s Republic of China laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People’s Republic of China

Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic structure and physicochemical property of electromagnetic wave absorption(EMWA)***,the relationship between configuration and electromagnetic(EM)loss mechanism has remained ***,drawing inspiration from the DNA transcription process,we report the successful synthesis of novel in situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA *** calculation and EM simulation confirm that the orbital coupling and spin polarization of the Mn–N4–C configuration,along with cross polarization generated by the helical structure,endow the helical converters with enhanced EM *** a result,HMC-8 demonstrates outstanding EMWA performance,achieving a minimum reflection loss of−63.13 dB at an ultralow thickness of 1.29 *** precise tuning of the graphite domain size,HMC-7 achieves an effective absorption bandwidth(EAB)of 6.08 GHz at 2.02 mm ***,constructing macroscale gradient metamaterials enables an ultrabroadband EAB of 12.16 GHz at a thickness of only 5.00 mm,with the maximum radar cross section reduction value reaching 36.4 dB *** innovative approach not only advances the understanding of metal–nonmetal co-doping but also realizes broadband EMWA,thus contributing to the development of EMWA mechanisms and applications.

关键词： Metal-nonmetal co-doping 3d-2p orbital coupling Spin polarization Helical structure Broadband EM wave absorption