A5046388151- Advanced Sensor and Energy Harvesting Materials
- Adhesion, Friction, and Surface Interactions
- Surface Modification and Superhydrophobicity
- Conducting polymers and applications
- Polymer Surface Interaction Studies
- Force Microscopy Techniques and Applications
- Advanced Materials and Mechanics
- Nanomaterials and Printing Technologies
- Advanced Cellulose Research Studies
- Cryptographic Implementations and Security
- Material Properties and Processing
- Polymer composites and self-healing
- Supercapacitor Materials and Fabrication
- Chaos-based Image/Signal Encryption
- MicroRNA in disease regulation
- Circular RNAs in diseases
- Electrospun Nanofibers in Biomedical Applications
- Polydiacetylene-based materials and applications
- Gear and Bearing Dynamics Analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- 3D Printing in Biomedical Research
- Bayesian Modeling and Causal Inference
- Cancer-related molecular mechanisms research
- Surface Roughness and Optical Measurements
- Granular flow and fluidized beds
University of Waterloo
2016-2025
Harbin Medical University
2020-2024
Southern Medical University
2021-2024
Nanfang Hospital
2019-2024
Second Affiliated Hospital of Harbin Medical University
2020-2024
University of Chicago
2019-2024
Chinese PLA General Hospital
2023
Tsinghua University
2007-2021
National Institute for Nanotechnology
2017-2020
Regional Municipality of Waterloo
2014-2020
Geckos can run rapidly on walls and ceilings, requiring high friction forces (on walls) adhesion ceilings), with typical step intervals of approximately 20 ms. The rapid switching between gecko foot attachment detachment is analyzed theoretically based a tape model that incorporates the originating from van der Waals submicron-sized spatulae substrate, which are controlled by (macroscopic) actions toes. pulling force spatula along its shaft an angle theta 0 90 degrees to has "normal force"...
A weak polyelectrolyte, poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA), was grafted onto the surface of cellulose nanocrystals via free radical polymerization. The resultant suspension PDMAEMA-grafted-cellulose (PDMAEMA-g-CNC) possessed pH-responsive properties. grafting confirmed by FTIR, potentiometric titration, elementary analysis, and thermogravimetric analysis (TGA); interfacial properties modified particles were characterized tensiometer. Compared to pristine nanocrystals, CNC...
A tape-peeling model based on the geometry of peel zone (PZ) is derived to predict peeling behavior adhesive tapes at angles less than or equal 90°. The PZ adds an angle-dependent multiplier Kendall equation that takes into account geometrical changes within zone. compared with experimental measurements force different for a tape and two commercial tapes, each bending moduli, stretch strengths. Good agreement found wide range angles. also applied gecko system predicts spatula angle 18.4°...
Self-peeling of gecko toes is mimicked by integration film-terminated fibrillar adhesives to hybrid nematic liquid crystal network (LCN) cantilevers. A soft gripper developed based on the gecko-inspired attachment/detachment mechanism. Performance fabricated for transportation thin delicate objects evaluated optimum mechanical strength LCN and maximum size adhesive patch.
Background and Purpose— Trimethylamine N-oxide (TMAO)—a gut derived metabolite—has been shown to be atherogenic. It remains unknown whether TMAO is associated with the risk of first stroke. We aimed determine association between serum levels stroke in hypertensive patients without major cardiovascular diseases examine any possible effect modifiers. Methods— used a nested case-control design, using data from CSPPT (China Stroke Primary Prevention Trial), including 622 matched controls. The...
A template‐free benign approach to modify polypyrrole (PPy) with bioinspired catechol derivatives dopamine (DA), 1,2‐dihydroxybenzene or (CA), and l ‐3,4‐dihydroxyphenylalanine (DOPA) is reported. It found that PPy functionalized these (DA, CA, DOPA) exhibited fibrous structure, smaller particle size, good water dispersibility, enhanced film adhesion. Surprisingly, it adding a small amount of catechols can also improve PPy's electrical conductivity. This rapid, one‐step, in situ, method...
We demonstrate a new approach to formulate mussel-inspired underwater adhesives, without requiring chemical conjugation of adhesive functionality polymer.
A functional structure of Mn0.5Zn0.5Fe2O4-on-polyaniline nanocomposites with high dielectric absorbing properties and electromagnetic shielding effectiveness at low frequencies was successfully fabricated through a facile in situ emulsion polymerization. Polyaniline (PANI) doped hydrochloric acid to improve its electrical interactions ferrite nanoparticles. The electrostatic force, paramagnetic force hydrogen bonding strongly bonded or assembled nanoparticles on the polyaniline surface...
Dopamine is a "sticky" biomolecule containing the typical functional groups of mussel adhesive proteins. It can self-polymerize into nanoscale thin film on various surfaces. We investigated surface, adhesion, friction, and cracking properties polydopamine (PDA) films for their effective transfer to devices biocompatible coatings. A series surface characterizations mechanical tests were performed reveal static dynamic PDA coated glass, polydimethylsiloxane (PDMS), epoxy. found that are highly...
Muscle-driven actuation of biomimetic microfibrillar structures is achieved using integrative soft-lithography on a backing splayed liquid-crystal elastomer (LCE). Variation in the LCE layer thickness yields different modes thermal deformation from pure bend to twist-bend. Muscular motion and dynamic self-cleaning gecko toe pads are mimicked via this mechanism. As service our authors readers, journal provides supporting information supplied by authors. Such materials peer reviewed may be...
The ionic conducting hydrogel has attracted tremendous attention in fabricating flexible artificial skin-like devices. However, there are still unsolved challenges hydrogel-based skins, such as poor fulfillment of stretchability and compliance weak interface interaction, well single sensory function. Herein, a high-performance organohydrogel-based skin is facilely fabricated through one-step UV-initiated polymerization, the presence polyacrylamide/cellulose nanofibril (PAAm/CNF) hybrid...
Abstract Human‐machine interfaces (HMIs) are essential for effective communication between machines and tissues. However, mechanical biological mismatches, along with weak adhesion rigid electronic devices soft tissue, often cause unreliable responses affect the signal recording of HMIs. In this study, an asymmetrical “Janus” biogel patch one side firmly adhering to tissues, other surface having little minimal interactions surrounding environments has been developed. A series analytical,...
3D printing techniques are increasingly being explored to produce hydrogels, versatile materials with a wide range of applications. While photopolymerization-based can customized hydrogel shapes and intricate structures, its reliance on rigid conditions limits material properties compared those extrusion printing. To address this limitation, study employed an alternative approach by organogel precursor using vat polymerization organic solvents instead water, followed solvent exchange after...
The extraordinary climbing ability of geckos is partially attributed to the fine structure their toe pads, which contain arrays consisting thousands micrometer-sized stalks (setae) that are in turn terminated by millions fingerlike pads (spatulae) having nanoscale dimensions. Using a surface forces apparatus (SFA), we have investigated dynamic sliding characteristics setal subjected various loading, unloading, and shearing conditions at different angles. Setal were glued onto silica...
We report the functionalization of polypyrrole (PPy) with a “sticky” biomolecule dopamine (DA), which mimics essential component mussel adhesive protein. PPy is one most promising electrically conductive polymers good biocompatibility. The research findings reveal that DA enhances dispersibility and stability in water its film adhesion to substrate surface significantly. electrical conductivity increases maximum value then decreases increasing concentration. An optimal pyrrole (Py) mole...
Abstract 3D programmable materials are highly interesting and have a great potential to enable smart robotic devices. Stimuli‐responsive liquid crystal polymer networks (LCNs) offer an attractive platform for the design fabrication of materials. To date, extensive efforts been devoted LCNs by spatially modulating orientation crystals. However, practical application LCN actuators has elusive, partly due tedious technology monotonous geometry. resolve this issue, shape changes achieved in with...