Hanxing Zhu - Academia.edu (original) (raw)

Papers by Hanxing Zhu

Research paper thumbnail of The effect of off-axis angles on the mesoscale deformation response and failure behavior of an orthotropic textile carbon-epoxy composite

Composite Structures, Dec 1, 2018

Research paper thumbnail of Longitudinal splitting versus sequential unzipping of thick-walled carbon nanotubes: Towards controllable synthesis of high-quality graphitic nanoribbons

Research paper thumbnail of Artificial chloroplast: Au/chloroplast-morph-TiO2 with fast electron transfer and enhanced photocatalytic activity

International Journal of Hydrogen Energy, Apr 1, 2014

ABSTRACT The unique structures and functional features of chloroplasts in green plants provide a ... more ABSTRACT The unique structures and functional features of chloroplasts in green plants provide a promising blueprint for greatly improving solar energy utilization efficiency. In this paper, a prototype of artificial chloroplast, Au/chloroplast-morph-TiO2 with natural chloroplasts' nanostructure and analogous functional features, is provided. The nano-layered structures of chloroplast template inherited in the chloroplast-morph-TiO2 lead to a large reaction area and fast photo-induced electron transfer; cocatalyst Au nanoparticles which work as reaction centers promote photo-induced charge separation and improve the overall photocatalytic activity in hydrogen production; Nitrogen and phosphorus self-doped from the bio-template increase visible light absorption, similar to the antenna pigment. With this new inorganic artificial photosynthetic system, we achieve effective light utilization, fast photo-induced charge separation, high electron transfer, enhanced photocatalytic activity for dye degradation rate and improved H-2 evolution efficiency. This concept provides the inspiration for constructing efficient photocatalysts by imitating the photosynthesis process from both structures and functions. Copyright

Research paper thumbnail of The elastic and geometrical properties of micro- and nano-structured hierarchical random irregular honeycombs

Journal of Materials Science, May 15, 2014

Research paper thumbnail of The effects of surface and initial stresses on the bending stiffness of nanowires

Nanotechnology, Aug 21, 2008

Research paper thumbnail of Large deformation pure bending of an elastic plastic power-law-hardening wide plate: Analysis and application

International Journal of Mechanical Sciences, Apr 1, 2007

ABSTRACT

Research paper thumbnail of Combined effects of relative density and material distribution on the mechanical properties of metallic honeycombs

Mechanics of Materials, May 1, 2011

ABSTRACT This paper presents the combined effects of relative density and material distribution o... more ABSTRACT This paper presents the combined effects of relative density and material distribution on the elastic constants and the yield strengths of metallic honeycombs. Periodic regular hexagonal cell is employed as the structural model. Cell wall bending, transverse shear and axial stretching/compression are taken as the deformation mechanisms in the analysis. Closed-form solutions for the yield strengths and all the five independent elastic constants are obtained for honeycombs with cell walls of uniform thickness. For honeycombs with cell walls of non-uniform thickness, the closed-form solutions would be too lengthy to use in practical applications. We instead provide numerical results to show the combined effects of relative density and material distribution on the initial and full yield strengths and all the five independent elastic constants of metallic honeycombs. The results can serve as a guide for the optimal design of metallic honeycombs.

Research paper thumbnail of Elasto-plastic behaviour of three-dimensional stochastic fibre networks

Research paper thumbnail of 3D immuno‐confocal image reconstruction of fibroblast cytoskeleton and nucleus architecture

Journal of Biophotonics, Oct 23, 2020

Research paper thumbnail of Experimental investigation on the heat dissipation performance of flared-fin heat sinks for concentration photovoltaic modules

Applied Thermal Engineering, Jul 1, 2019

Research paper thumbnail of The elasto-plastic behaviour of three-dimensional stochastic fibre networks with cross-linkers

Journal of The Mechanics and Physics of Solids, 2018

Research paper thumbnail of Size-dependent and tunable elastic properties of hierarchical honeycombs with regular square and equilateral triangular cells

Acta Materialia, Jul 1, 2012

Research paper thumbnail of Biogenic N-I-codoped TiO<sub>2</sub>photocatalyst derived from kelp for efficient dye degradation

Energy and Environmental Science, 2011

ABSTRACT The design and fabrication of efficient, cost-effective photocatalysts are required in o... more ABSTRACT The design and fabrication of efficient, cost-effective photocatalysts are required in order to ease global energy and environmental issues. In this paper, we have obtained a biogenic-TiO2 photocatalyst through a simple one step infiltration process which can replicate well the hierarchical architecture of kelp from the macro- down to the nano-scale. In addition, the nitrogen and iodine, contained in the original plant corpus, are self-doped into the resulting samples. UV-Visiblediffuse reflectance spectra of the biogenic-TiO2 indicate that it has efficient light-harvesting capacity, especially in the region from 400 nm to 550 nm, and compared with the common N-TiO2, its band gap absorption edge exhibits a clear red shift due to the self-doping. Moreover, the biogenic-TiO2 possesses excellent photocatalytic properties proved by the photocatalytic activity of methylene blue degradation under solar energy irradiation. This work may provide the inspiration for the synthesis of further high performance photocatalysts based on the kelp structure and a new methodology for application of nature&#39;s plants and utilization of solar energy with biogenic materials.

Research paper thumbnail of Effects of cell irregularity on the elastic properties of 2D Voronoi honeycombs

Journal of The Mechanics and Physics of Solids, Apr 1, 2001

Foams are more and more widely used in di erent areas. Most available mechanical models are usual... more Foams are more and more widely used in di erent areas. Most available mechanical models are usually based on idealised unit cell structures, and are not able to account for the natural variations in microstructure which are typical for most foam structures. The objective of this work has been to investigate how the cell irregularity a ects the elastic properties of 2D random foams. We have constructed periodical random structures with di erent degrees of irregularity, and applied ÿnite element analysis (FEA) to determine their e ective elastic properties. The results indicate that, the more irregular the 2D random foams, the larger will be their e ective Young's modulus and shear modulus, and the smaller will be their bulk modulus at a constant overall relative density. However, for varying degrees of irregularity, the foams remain isotropic and the Poisson's ratios are very close to 1. Both Young's modulus and Poisson's ratio of random Voronoi honeycombs having di erent degrees of regularity , decrease gradually with increasing relative density .

Research paper thumbnail of The elastic properties of composites reinforced by a transversely isotropic random fibre-network

Composite Structures, 2019

Research paper thumbnail of Composite Materials with Enhanced Conductivities

Advanced Engineering Materials, Feb 29, 2016

Research paper thumbnail of Quantifying the discrepancies in the geometric and mechanical properties of the theoretically designed and additively manufactured scaffolds

Journal of The Mechanical Behavior of Biomedical Materials, Dec 1, 2020

Research paper thumbnail of Polymerization force-regulated actin filament-Arp2/3 complex interaction dominates self-adaptive cell migrations

bioRxiv (Cold Spring Harbor Laboratory), Apr 15, 2023

Cells migrate by adapting their leading-edge behaviours to heterogeneous extracellular microenvir... more Cells migrate by adapting their leading-edge behaviours to heterogeneous extracellular microenvironments (ECMs) during cancer invasions and immune responses. Yet it remains poorly understood how such complicated dynamic behaviours emerge from millisecond-scale assembling activities of protein molecules, which are hard to probe experimentally. To address this gap, we established a spatiotemporal "resistance-adaptive propulsion" theory based on the protein interactions between Arp2/3 complexes and polymerizing actin filaments, and a multiscale dynamic modelling system spanning from molecular proteins to the cell. Combining spatiotemporal simulations with experiments, we quantitatively find that cells can accurately self-adapt propulsive forces to overcome heterogeneous ECMs via a resistance-triggered positive feedback mechanism, dominated by polymerization-induced actin filament bending and the bending-regulated actin-Arp2/3 binding. However, for high resistance regions, resistance triggered a negative feedback, hindering branched filament assembly, which adapts cellular morphologies to circumnavigate the obstacles. Strikingly, the synergy of the two opposite feedbacks not only empowers cells with both powerful and flexible migratory capabilities to deal with complex ECMs, but also endows cells to use their intracellular proteins efficiently. In addition, we identify that the nature of cell migration velocity depending on ECM history stems from the inherent temporal hysteresis of cytoskeleton remodelling. We also quantitatively show that directional cell migration is dictated by the competition between the local stiffness of ECMs and the local polymerizing rate of actin network caused by chemotactic cues. Our results reveal that it is the polymerization force-regulated actin filament-Arp2/3 complex binding interaction that dominates self-adaptive cell migrations in complex ECMs, and we provide a predictive theory and a spatiotemporal multiscale modelling system at the protein level. .

Research paper thumbnail of Nonlinear elastic behaviors and deformation mechanisms of nano-structured crosslinked biopolymer networks

Extreme Mechanics Letters

Research paper thumbnail of Nano-structured interpenetrating composites with enhanced Young’s modulus and desired Poisson’s ratio

Composites Part A-applied Science and Manufacturing, Dec 1, 2016

r u c t u r e d in t e r p e n e t r a ti n g c o m p o si t e s wi t h e n h a n c e d Youn g ' ... more r u c t u r e d in t e r p e n e t r a ti n g c o m p o si t e s wi t h e n h a n c e d Youn g ' s m o d ul u s a n d d e si r e d Pois s o n ' s r a tio. Co m p o sit e s P a r t A: Ap plie d S ci e n c e a n d M a n uf a c t u ri n g 9 1 (1) , p p. 1 9 5-2 0 2 .

Research paper thumbnail of The effect of off-axis angles on the mesoscale deformation response and failure behavior of an orthotropic textile carbon-epoxy composite

Composite Structures, Dec 1, 2018

Research paper thumbnail of Longitudinal splitting versus sequential unzipping of thick-walled carbon nanotubes: Towards controllable synthesis of high-quality graphitic nanoribbons

Research paper thumbnail of Artificial chloroplast: Au/chloroplast-morph-TiO2 with fast electron transfer and enhanced photocatalytic activity

International Journal of Hydrogen Energy, Apr 1, 2014

ABSTRACT The unique structures and functional features of chloroplasts in green plants provide a ... more ABSTRACT The unique structures and functional features of chloroplasts in green plants provide a promising blueprint for greatly improving solar energy utilization efficiency. In this paper, a prototype of artificial chloroplast, Au/chloroplast-morph-TiO2 with natural chloroplasts&#39; nanostructure and analogous functional features, is provided. The nano-layered structures of chloroplast template inherited in the chloroplast-morph-TiO2 lead to a large reaction area and fast photo-induced electron transfer; cocatalyst Au nanoparticles which work as reaction centers promote photo-induced charge separation and improve the overall photocatalytic activity in hydrogen production; Nitrogen and phosphorus self-doped from the bio-template increase visible light absorption, similar to the antenna pigment. With this new inorganic artificial photosynthetic system, we achieve effective light utilization, fast photo-induced charge separation, high electron transfer, enhanced photocatalytic activity for dye degradation rate and improved H-2 evolution efficiency. This concept provides the inspiration for constructing efficient photocatalysts by imitating the photosynthesis process from both structures and functions. Copyright

Research paper thumbnail of The elastic and geometrical properties of micro- and nano-structured hierarchical random irregular honeycombs

Journal of Materials Science, May 15, 2014

Research paper thumbnail of The effects of surface and initial stresses on the bending stiffness of nanowires

Nanotechnology, Aug 21, 2008

Research paper thumbnail of Large deformation pure bending of an elastic plastic power-law-hardening wide plate: Analysis and application

International Journal of Mechanical Sciences, Apr 1, 2007

ABSTRACT

Research paper thumbnail of Combined effects of relative density and material distribution on the mechanical properties of metallic honeycombs

Mechanics of Materials, May 1, 2011

ABSTRACT This paper presents the combined effects of relative density and material distribution o... more ABSTRACT This paper presents the combined effects of relative density and material distribution on the elastic constants and the yield strengths of metallic honeycombs. Periodic regular hexagonal cell is employed as the structural model. Cell wall bending, transverse shear and axial stretching/compression are taken as the deformation mechanisms in the analysis. Closed-form solutions for the yield strengths and all the five independent elastic constants are obtained for honeycombs with cell walls of uniform thickness. For honeycombs with cell walls of non-uniform thickness, the closed-form solutions would be too lengthy to use in practical applications. We instead provide numerical results to show the combined effects of relative density and material distribution on the initial and full yield strengths and all the five independent elastic constants of metallic honeycombs. The results can serve as a guide for the optimal design of metallic honeycombs.

Research paper thumbnail of Elasto-plastic behaviour of three-dimensional stochastic fibre networks

Research paper thumbnail of 3D immuno‐confocal image reconstruction of fibroblast cytoskeleton and nucleus architecture

Journal of Biophotonics, Oct 23, 2020

Research paper thumbnail of Experimental investigation on the heat dissipation performance of flared-fin heat sinks for concentration photovoltaic modules

Applied Thermal Engineering, Jul 1, 2019

Research paper thumbnail of The elasto-plastic behaviour of three-dimensional stochastic fibre networks with cross-linkers

Journal of The Mechanics and Physics of Solids, 2018

Research paper thumbnail of Size-dependent and tunable elastic properties of hierarchical honeycombs with regular square and equilateral triangular cells

Acta Materialia, Jul 1, 2012

Research paper thumbnail of Biogenic N-I-codoped TiO<sub>2</sub>photocatalyst derived from kelp for efficient dye degradation

Energy and Environmental Science, 2011

ABSTRACT The design and fabrication of efficient, cost-effective photocatalysts are required in o... more ABSTRACT The design and fabrication of efficient, cost-effective photocatalysts are required in order to ease global energy and environmental issues. In this paper, we have obtained a biogenic-TiO2 photocatalyst through a simple one step infiltration process which can replicate well the hierarchical architecture of kelp from the macro- down to the nano-scale. In addition, the nitrogen and iodine, contained in the original plant corpus, are self-doped into the resulting samples. UV-Visiblediffuse reflectance spectra of the biogenic-TiO2 indicate that it has efficient light-harvesting capacity, especially in the region from 400 nm to 550 nm, and compared with the common N-TiO2, its band gap absorption edge exhibits a clear red shift due to the self-doping. Moreover, the biogenic-TiO2 possesses excellent photocatalytic properties proved by the photocatalytic activity of methylene blue degradation under solar energy irradiation. This work may provide the inspiration for the synthesis of further high performance photocatalysts based on the kelp structure and a new methodology for application of nature&#39;s plants and utilization of solar energy with biogenic materials.

Research paper thumbnail of Effects of cell irregularity on the elastic properties of 2D Voronoi honeycombs

Journal of The Mechanics and Physics of Solids, Apr 1, 2001

Foams are more and more widely used in di erent areas. Most available mechanical models are usual... more Foams are more and more widely used in di erent areas. Most available mechanical models are usually based on idealised unit cell structures, and are not able to account for the natural variations in microstructure which are typical for most foam structures. The objective of this work has been to investigate how the cell irregularity a ects the elastic properties of 2D random foams. We have constructed periodical random structures with di erent degrees of irregularity, and applied ÿnite element analysis (FEA) to determine their e ective elastic properties. The results indicate that, the more irregular the 2D random foams, the larger will be their e ective Young's modulus and shear modulus, and the smaller will be their bulk modulus at a constant overall relative density. However, for varying degrees of irregularity, the foams remain isotropic and the Poisson's ratios are very close to 1. Both Young's modulus and Poisson's ratio of random Voronoi honeycombs having di erent degrees of regularity , decrease gradually with increasing relative density .

Research paper thumbnail of The elastic properties of composites reinforced by a transversely isotropic random fibre-network

Composite Structures, 2019

Research paper thumbnail of Composite Materials with Enhanced Conductivities

Advanced Engineering Materials, Feb 29, 2016

Research paper thumbnail of Quantifying the discrepancies in the geometric and mechanical properties of the theoretically designed and additively manufactured scaffolds

Journal of The Mechanical Behavior of Biomedical Materials, Dec 1, 2020

Research paper thumbnail of Polymerization force-regulated actin filament-Arp2/3 complex interaction dominates self-adaptive cell migrations

bioRxiv (Cold Spring Harbor Laboratory), Apr 15, 2023

Cells migrate by adapting their leading-edge behaviours to heterogeneous extracellular microenvir... more Cells migrate by adapting their leading-edge behaviours to heterogeneous extracellular microenvironments (ECMs) during cancer invasions and immune responses. Yet it remains poorly understood how such complicated dynamic behaviours emerge from millisecond-scale assembling activities of protein molecules, which are hard to probe experimentally. To address this gap, we established a spatiotemporal "resistance-adaptive propulsion" theory based on the protein interactions between Arp2/3 complexes and polymerizing actin filaments, and a multiscale dynamic modelling system spanning from molecular proteins to the cell. Combining spatiotemporal simulations with experiments, we quantitatively find that cells can accurately self-adapt propulsive forces to overcome heterogeneous ECMs via a resistance-triggered positive feedback mechanism, dominated by polymerization-induced actin filament bending and the bending-regulated actin-Arp2/3 binding. However, for high resistance regions, resistance triggered a negative feedback, hindering branched filament assembly, which adapts cellular morphologies to circumnavigate the obstacles. Strikingly, the synergy of the two opposite feedbacks not only empowers cells with both powerful and flexible migratory capabilities to deal with complex ECMs, but also endows cells to use their intracellular proteins efficiently. In addition, we identify that the nature of cell migration velocity depending on ECM history stems from the inherent temporal hysteresis of cytoskeleton remodelling. We also quantitatively show that directional cell migration is dictated by the competition between the local stiffness of ECMs and the local polymerizing rate of actin network caused by chemotactic cues. Our results reveal that it is the polymerization force-regulated actin filament-Arp2/3 complex binding interaction that dominates self-adaptive cell migrations in complex ECMs, and we provide a predictive theory and a spatiotemporal multiscale modelling system at the protein level. .

Research paper thumbnail of Nonlinear elastic behaviors and deformation mechanisms of nano-structured crosslinked biopolymer networks

Extreme Mechanics Letters

Research paper thumbnail of Nano-structured interpenetrating composites with enhanced Young’s modulus and desired Poisson’s ratio

Composites Part A-applied Science and Manufacturing, Dec 1, 2016

r u c t u r e d in t e r p e n e t r a ti n g c o m p o si t e s wi t h e n h a n c e d Youn g ' ... more r u c t u r e d in t e r p e n e t r a ti n g c o m p o si t e s wi t h e n h a n c e d Youn g ' s m o d ul u s a n d d e si r e d Pois s o n ' s r a tio. Co m p o sit e s P a r t A: Ap plie d S ci e n c e a n d M a n uf a c t u ri n g 9 1 (1) , p p. 1 9 5-2 0 2 .