Team galleryTeam_gallary.html

Selected publications:

---Slowing down of  Brownian motion in a 2D confinement   

     Brownian motion of colloidal particles in quasi-two-dimensional (qTD) confinement displays distinct dynamic characters from that in bulk. Past studies concentrated on relatively 'fast' dynamics of particle motion in the confinement. Here we experimentally report a 'slow' dynamics evolution in qTD system. This imperceptible feature is only disclosed after the dynamical system proceeds towards a long time scale: the existence of a quasi-equilibrium state of Brownian motion of colloidal particles. In the long process of quasi-equilibrium, the confinement results in the coupling of particle motions, which slowly dampens the motion and interaction of particles until the  final equilibrium state reaches after 100-hour coupling. We develop the theory of Brownian particles in qTD confinement to introduce the coupling effect, which infers a feasible method for designing kernel coefficients to bring the complex interaction into well-known solution of Brownian motion.

     Confined colloids into 2D cell are strongly coupled together by collision, and are brought to an equilibrium state after long evolution.

Jun Ma; Guangyin Jing. Coupling motion of colloidal particles in quasi-two-dimensional confinement. New Journal of Physics 16(7): 073025. (2014).


---Phase separation induced the crack pattern from drying colloidal suspension

     The fracture mechanics was usually employed to explain the crack propagation in the deposition produced by drying colloidal suspension. However, more complex than conventional fracture, those cracks periodically distribute and make up a unique pattern. Inspired by the concept of spinodal decomposition, here we develop the theory to illustrate the possible mechanism of the spatial arrangement of the cracks. It indicates that before the cracks develop and propagate in the deposition under the law of fracture mechanics, the periodically distributed flaws are generated by the phase separation of colloidal clusters and solvent. Then the cracks originate at the sites of those flaws in terms of fracture mechanics. It concludes that the crack spacing results from the wavelength of the concentration fluctuation during the phase separation, linearly growing with the increase of the deposition thickness and initial particle concentration, which is consistent with experimental results.    

     Drying colloidal suspensions presents versatile crack patterns, which are induced by accumulating stress by the capillary and the shrinkage at the interfaces. However, the microstructures formed during the drying by colloid aggregation and phase separation, design the crack pattern with unique spatial configurations. Here, the silica nanoparticles aggregate during the early drying, and then accumulate with periodic distribution by the capillary force at the end of drying, which form the water-rich and nanoparticle-rich zones parallel to each other, so produce the regular crack pattern.

J. Ma, G. Jing. Origin of crack pattern in the deposition from drying colloidal suspension. Phys. Rev. E 86, 061406  (2012).  PDF in  arxiv.org

---Formation of Circular Crack Pattern in Drying Deposit from Nanoparticle Suspension

     Curved cracks widely exist in nanoparticle (NP) deposition produced by drying colloidal suspension. Circular cracks, for example, initiate and propagate along a circular trajectory. One feasible theoretical explanation of a circular crack is the Xia-Hutchinson model, in which a preexisting track (flaw loop) in the film is necessary for initiating and propagating the crack on the circular path. Here, we report the first experimental evidence of dried deposition to support this model. Our results indicate that cracks along the circular trajectory can surprisingly passacross a 180 μm air gap. Moreover, two arc-path cracks originate in different areas and propagate to meet, forming a circular trajectory. These unexpected crack initiation and propagation indicate that the crack propagates alone the preformedtrack, experimentally confirming the hypothesis proposed by the XiaHutchinson model. The transition of the circular crack to a radial one indicates that the deposition microstructure is the dominant factor for the crack formation.

Circular cracks from the drying silica suspension on hydrophobic substrates.

G. Jing, J. Ma. Formation of circular crack pattern in deposition self-assembled by drying nanoparticle suspension. J. Phys. Chem. B, 116, 6225 (2012).

---Crack pattern driven by the phase separation in the drying of binary colloid–polymer suspension

     Apart from the drying pure silica colloidal suspension, colloid-polymer mixture is subject to evaporation, and demonstrates two phase separation stage: the depletion-induced phase separation between colloid and polymer; and the water drainage from the ‘porous’ like colloidal deposit hindered by the polymer chains. These two process cause the unique crack pattern different that without additive of polymers into the colloidal suspension.

Phase separation happens in the colloid-polymer mixture, and redirect the crack orientation.


T. Liu; H. Luo; J. Ma; P. Wang; L. Wang; G. Jing. Tuning crack pattern by phase separation in the drying of binary colloid–polymer suspension. Physics Letters A 378, (16–17), 1191-1199, (2014).

---Contact Angle of Glycerol Nanodroplets Under van der Waals Force

     Classical Young's equation links the surface energy of the connected three phase with the contact angle for macro drops, and has been modified to represent the line tension effect when the drop gets smaller to micrometer scale, i e. holding the relation of cosθ~1/r. However the question arises that what will happen when the drop size reduce down to the nanoscale. In our work, the nanodroplets were observed by AFM and shown the multiple values of the contact angles with respect to the diameter of the droplet(<100nm). A new kind of contact angle hysteresis induced by the van der Waals force were elucidated, which introduced the dispersion force to balance the surface tension and resulted in the non-monotonic correlation between contact angle and droplet size.

    Nanodroplets by AFM (left); surface tension at multiple scale (Middle); non-monotonic correlation beween contact angle and droplet size (Right).

Jun Ma; Guangyin Jing; Shiyi Chen; Dapeng Yu. Contact Angle of Glycerol Nanodroplets Under van der Waals Force. Journal of Physical Chemistry C 113, (36), 16169-16173, (2009).

---Cellular pattern of nanodroplets by forced dewetting

     Differing with the classical spinodal decomposition and hole nucleation mechanism, the external mechanical energy into a thin film results in a new kind of dewetting pattern of the nanodroplets. The mono-directional textured nanodroplets are arranged in the close-packaged formation, which are conducted by the surface wave direction and broken into nanodroples by the Rayleigh instability.














The nucleation of ‘cellular grains’ aligning with monodirectional texture (green arrow direction).

Jun Ma; Guangyin Jing; Dapeng Yu. Cellular pattern separation into nanodroplets. Soft Matter 6, (7), 1527-1532, (2010).

---Size effect of elastic modulus by introducing the surface stress
we found that elastic properties of Ag nanowires hold the size dependence, which is due to the surface effect as diameter of the nanowire is down to tens nanometers. We have developed an analytical model to explain this phenomenon, and obtained the consistency between experiment and theoretical predictions.












Elastic modulus of silver Nanowires increases with the diameter decrease.

G. Jing; H. Duan; X. Sun; Z. Zhang; J. Xu; Y. Li; J. Wang; D. Yu. Surface effects on elastic properties of silver nanowires: contact atomic-force microscopy. Physical Review B 73, (23), 235409, (2006).

Full publications:

42.    H. Luo, T. Liu, J. Ma, P. Wang, Y. Wang, Y.P Wang, G. Jing*. Evaporation-induced failure of hydrophobicity. Physical Review: Fluids. 1, 053901(2016).

41.    H. Zhao, J. Xu, G. Jing, L. O. Prieto-López, X. Deng and J. Cui. Controlling the Localization of Liquid Droplets in Polymer Matrices by Evaporative Lithography. Angewandte Chemie International Edition, 55:10681-10685(2016).

40.    B. Z. Yu, X. Dan Zhao, J. Luo, H. G. Zhang, Y. W. Zhu, G. Y. Jing, P. Ma, Z. Y. Ren and H. M. Fan. Hierarchical α-MnO2 Tube-on-Tube Arrays with Superior, Structure-Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism. Advanced Materials Interfaces: 3(8): 1500761 (2016).

39.    Tingting Liu, Hao Luo, Jun Ma, Weiguang Xie, Yan Wang, Guangyin Jing*. Surface roughness induced cracks of the deposition film from drying colloidal suspension. European Physical Journal E 39(2): 1-8 (2016).

38.    H. Li, H. Luo, Z. Zhang, Y.-J. Li, B. Xiong, C. Qiao, X. Cao, T. Wang, Y. He and G. Jing*. Direct Observation of Nanoparticle Multiple-Ring Pattern Formation during Droplet Evaporation with Dark-Field Microscopy. Phys. Chem. Chem. Phys. 18(18): 13018-13025 (2016).

37.    H. P. Yu, H. Luo, T. T. Liu and G. Y. Jing. Deposit heterogeneity and the dynamics of the organic semiconductors P3HT and PCBM solution under evaporation. Mod. Phys. Lett. B 29(09): 1550028 (2015).

36.    B. Z. Yu, X. L. Liu, H. G. Zhang, G. Y. Jing, P. Ma, Y. Luo, W. M. Xue, Z. Y. Ren and H. M. Fan. Fabrication and structural optimization of porous single-crystal α-Fe2O3microrices for high-performance lithium-ion battery anodes. J. Mater. Chem. A 3(32): 16544-16550 (2015).

35.    H. Luo, J. Ma, P. Wang, J. Bai and G. Jing. Two-step wetting transition on ZnO nanorod arrays. Appl. Surf. Sci. 347: 868-874 (2015).

34.    D. Zhang, X. Hu, G. Jing, E. Liu, J. Fan, G. Zhang and X. Hou. Transition from Eu3+ to Eu2+ in SiO2 matrix prepared by sol-gel. J. Nanosci. Nanotechnol. 14(5): 3642-3647 (2014).

33.    J. Ma and G. Jing. Coupling motion of colloidal particles in quasi-two-dimensional confinement. New Journal of Physics 16(7): 073025 (2014).

32.    H. Lu, Z. Tian, H. Yu, B. Yang, G. Jing, G. Liao, J. Zhang, J. Yu, J. Tang, Y. Luo and Z. Chen. Optical fiber with nanostructured cladding of TiO2 nanoparticles self-assembled onto a side polished fiber and its temperature sensing. Opt. Express 22(26): 32502-32508 (2014).

31.    X. L. Liu, Y. T. Wang, C. T. Ng, R. Wang, G. Y. Jing, J. B. Yi, J. Yang, B. H. Bay, L.-Y. L. Yung, D. D. Fan, J. Ding and H. M. Fan. Coating Engineering of MnFe2O4 Nanoparticles with Superhigh T2 Relaxivity and Efficient Cellular Uptake for Highly Sensitive Magnetic Resonance Imaging. Advanced Materials Interfaces 1(2): 1300069 (2014).

30.    T. Liu, H. Luo, J. Ma, P. Wang, L. Wang and G. Jing. Tuning crack pattern by phase separation in the drying of binary colloid–polymer suspension. Phys. Lett. A 378(16–17): 1191-1199 (2014).

29.    Q.-Y. Lin, Y.-H. Zeng, D. Liu, G. Y. Jing, Z.-M. Liao and D. Yu. Step-by-Step Fracture of Two-Layer Stacked Graphene Membranes. ACS Nano 8(10): 10246-10251 (2014).

28.    D. Zhang, X. Hu, E. Liu, R. Ji, S. Zhan, G. Jing, J. Fan and X. Hou. One-Step Preparation and Fluorescence Enhancement Effect in SiO2/Eu2+ Doped with Ag Nanowires. Plasmonics 8(2): 969-974 (2013).

27.    Z. Ren, G. Jing, Y. Liu, J. Gao, Z. Xiao, Z. Liu, S. Yin, S. Zhou, G. Xu, X. Li, G. Shen and G. Han. Pre-perovskite nanofiber: a new direct-band gap semiconductor with green and near infrared photoluminescence. RSC Advances 3(16): 5453-5458 (2013).

26.    X. Ma, H. Luo, J. Ma, P. Wang, X. Xu and G. Jing. A facile approach for fabrication of underwater superoleophobic alloy. Applied Physics A 113(3): 693-702 (2013).

25.    H. Luo, T. Liu, J. Ma, W. Wang, H. Li, P. Wang, J. Bai and G. Jing. Irregular shaping of polystyrene nanosphere array by plasma etching. Materials Science-Poland 31(3): 331-337 (2013).

24.    Q.-Y. Lin, G. Jing, Y.-B. Zhou, Y.-F. Wang, J. Meng, Y.-Q. Bie, D.-P. Yu and Z.-M. Liao. Stretch-Induced Stiffness Enhancement of Graphene Grown by Chemical Vapor Deposition. ACS Nano 7(2): 1171-1177 (2013).

23.    M. Lanza, Y. Wang, T. Gao, A. Bayerl, M. Porti, M. Nafria, Y. Zhou, G. Jing, Y. Zhang and Z. Liu. Electrical and mechanical performance of graphene sheets exposed to oxidative environments. Nano Research 6(7): 485-495 (2013).

22.    M. Lanza, Y. Wang, A. Bayerl, T. Gao, M. Porti, M. Nafria, H. Liang, G. Jing, Z. Liu, y. Zhang, Y. Tong and H. Duan. Tuning graphene morphology by substrate towards wrinkle-free devices: Experiment and simulation. J. Appl. Phys. 113(10): 104301-104307 (2013).

21.    M. Lanza, A. Bayerl, T. Gao, M. Porti, M. Nafria, G. Jing, y. Zhang, Z. Liu and H. Duan. Graphene-Coated Atomic Force Microscope Tips for Reliable Nanoscale Electrical Characterization. Adv. Mater. 25(10): 1440-1444 (2013).

20.    Y. Yan, Z.-M. Liao, F. Yu, H.-C. Wu, G. Jing, Z.-C. Yang, Q. Zhao and D. Yu. Synthesis and field emission properties of topological insulator Bi2Se3 nanoflake arrays. Nanotechnology 23(30): 305704 (2012).

19.    X. L. Xu, J. X. Wang, G. Y. Jing, Z. X. Shen, B. S. Zou, H. M. Fan and M. Olivo. Amplified spontaneous emission from single CdS nanoribbon with low symmetric cross sections. Nanoscale 4(18): 5665-5672 (2012).

18.    J. Ma and G. Jing. Possible origin of the crack pattern in deposition films formed from a drying colloidal suspension. Phys. Rev. E 86(6): 061406 (2012).

17.    G. Jing and J. Ma. Formation of Circular Crack Pattern in Deposition Self-Assembled by Drying Nanoparticle Suspension. The Journal of Physical Chemistry B 116(21): 6225-6231 (2012).

16.    X.-W. Fu, Z.-M. Liao, J.-X. Zhou, Y.-B. Zhou, H.-C. Wu, R. Zhang, G. Jing, J. Xu, X. Wu and W. Guo. Strain dependent resistance in chemical vapor deposition grown graphene. Appl. Phys. Lett. 99(21): 213107-213107-213103 (2011).

15.    J. Ma, G. Jing and D. Yu. Cellular pattern separation into nanodroplets. Soft Matter 6(7): 1527-1532 (2010).

14.    G. Jing, X. Zhang and D. Yu. Effect of surface morphology on the mechanical properties of ZnO nanowires. Appl. Phys. A: Mater. Sci. Process. 100(2): 473-478 (2010).

13.    C. Zou, G. Jing, D. Yu, Y. Xue and H. Duan. Mechanical properties of TiSi2 nanowires. Phys. Lett. A 373(23): 2065-2070 (2009).

12.    J. Ma, G. Jing, S. Chen and D. Yu. Contact Angle of Glycerol Nanodroplets Under van der Waals Force. J. Phys. Chem. C 113(36): 16169-16173 (2009).

11.    G. Jing, H. Bodiguel, F. Doumenc, E. Sultan and B. Guerrier. Drying of Colloidal Suspensions and Polymer Solutions near the Contact Line: Deposit Thickness at Low Capillary Number. Langmuir 26(4): 2288-2293 (2009).

10.    X. Han, G. Jing, X. Zhang, R. Ma, X. Song, J. Xu, Z. Liao, N. Wang and D. Yu. Bending-induced conductance increase in individual semiconductor nanowires and nanobelts. Nano Research 2(7): 553-557 (2009).

9.    C. Zou, X. Zhang, G. Jing, J. Zhang, Z. Liao and D. Yu. Synthesis and electrical properties of TiSi2nanocables. Appl. Phys. Lett. 92(25): 253102-253102-253103 (2008).

8.    G. Jing, J. Ma and D. Yu. Calibration of the spring constant of AFM cantilever. J. Electron Microsc. 56(1): 21 (2007).

7.    X. Xu, Y. Wang, X. Zhang, G. Jing, D. Yu and S. Wang. Effects on surface properties of natural bamboo fibers treated with atmospheric pressure argon plasma. Surf. Interface Anal. 38(8): 1211-1217 (2006).

6.    G. Jing, H. Ji, W. Yang, J. Xu and D. Yu. Study of the bending modulus of individual silicon nitride nanobelts via atomic force microscopy. Appl. Phys. A: Mater. Sci. Process. 82(3): 475-478 (2006).

5.    G. Jing, H. Duan, X. Sun, Z. Zhang, J. Xu, Y. Li, J. Wang and D. Yu. Surface effects on elastic properties of silver nanowires: contact atomic-force microscopy. Phys. Rev. B 73(23): 235409 (2006).

4.    Y. Xing, G. Jing, J. Xu, D. Yu, H. Liu and Y. Li. Electrical conductivity of a single C nanotube. Appl. Phys. Lett. 87: 263117 (2005).

3.    X.-Y. Xu, S.-G. Wang, T.-C. Ye, G.-Y. Jing and D.-P. Yu. Surface modification of polyester film by glow discharge tunnel at atmospheric pressure. Transactions of the Nonferrous Metals Society of China 14(2): 459-462 (2004).

2.    Y. Mao, C. Luo, W. Deng, G. Jin, X. Yu, Z. Zhang, Q. Ouyang, R. Chen and D. Yu. Reversibly switchable DNA nanocompartment on surfaces. Nucleic Acids Res. 32(19): e144-e144 (2004).

1.    D. Chen, G. Jing and A. Wei. The Determination of SP3 fraction in tetrahedral amorphous carbon films by Raman and X-ray photoelectron spectroscop. International Journal of Modern Physics B 16(28n29): 4413-4417 (2002).