Jing Yang

Publications (4)11.88 Total impact

• Article: Quasi-bichromatic laser for a lin⊥lin coherent population trapping clock produced by vertical-cavity surface-emitting lasers.

  Peter Yun, Bozhong Tan, Wei Deng, Jing Yang, Sihong Gu
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  ABSTRACT: With two vertical-cavity surface-emitting lasers working under the master-slave sideband injection-locking configuration, we have realized a quasi-bichromatic laser beam with residual phase noise Δφ(2) < 0.282 rad(2). The two wanted frequency components share more than 96% power of the beam. With the realized beam, we have carried out coherent population trapping (CPT) resonance experiment with (87)Rb in the lin⊥lin CPT scheme, and recorded CPT resonance signal with contrast of 60%. Such laser system is promising to realize a lin⊥lin CPT clock with high performance and low power consumption.
  The Review of scientific instruments 09/2012; 83(9):093111. · 1.52 Impact Factor
• Article: Formation of polymer vesicles by liquid crystal amphiphilic block copolymers.

  Jing Yang, Rafael Piñol, Francesca Gubellini, Daniel Lévy, Pierre-Antoine Albouy, Patrick Keller, Min-Hui Li
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  ABSTRACT: We report the formation of polymer vesicles (or polymersomes) by a new class of amphiphilic block copolymers in which the hydrophobic block is a side-on nematic liquid crystal polymer. Two series of these block copolymers, named PEG-b-PA444 and PEG-b-PMAazo444, with different hydrophilic/hydrophobic ratios were synthesized and characterized in detail. Polymersomes and nanotubes were formed by adding water into a solution of copolymers in dioxane. Polymersomes in water were finally obtained by dialyzing the resulting mixture against water. These self-assemblies have been studied by classical TEM and cryo-TEM. For the PEG-b-PA444 series, polymersomes were observed for hydrophilic/hydrophobic ratios ranging from 40/60 to 19/81. For PEG-b-PMAazo444 series, polymersomes were observed for hydrophilic/hydrophobic ratios ranging from 26/74 to 18/82. For a PEG-b-PA444 sample with hydrophilic/hydrophobic ratio equal to 25/75, a tubular morphology with tube diameter of typically 100 nm and tube length of up to 10 mum was also observed together with polymersomes during addition of water into the polymer solution in dioxane.
  Langmuir 09/2006; 22(18):7907-11. · 4.19 Impact Factor
• Article: A Rheological and SAXS Study of the Lamellar Order in a Side-on Liquid Crystalline Block Copolymer

  Valeria Castelletto, Petros Parras, Ian W. Hamley, Patrick Davidson, Jing Yang, Patrick Keller, Min-Hui Li
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  ABSTRACT: We study the structure and shear flow behavior of a side-on liquid crystalline triblock copolymer, named PBA-b-PA444-b-PBA (PBA is poly(butyl acrylate) and PA444 is a poly(acrylate) with a nematic liquid crystal side-on mesogen), in the self-assembled lamellar phase and in the disordered phase. Simultaneous oscillatory shear and small-angle X-ray scattering experiments show that shearing PBA-b-PA444-b-PBA at high frequency and strain amplitudes leads to the alignment of the lamellae with normals perpendicular to the shear direction and to the velocity gradient direction, i.e., in the perpendicular orientation. The order-to-disorder transition temperature (TODT) is independent of the applied strain, in contrast to results reported in the literature for coil−coil diblock copolymers, which show an increase in TODT with shear rate. It is possible that in our system, TODT does not depend on the applied strain because the fluctuations are weaker than those present in coil−coil diblock copolymer systems.
  11/2005;
• Article: Polymer vesicles formed by amphiphilic diblock copolymers containing a thermotropic liquid crystalline polymer block.

  Jing Yang, Daniel Lévy, Wei Deng, Patrick Keller, Min-Hui Li
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  ABSTRACT: New amphiphilic diblock copolymers composed of poly(ethylene glycol) and a thermotropic liquid crystalline polymer have been synthesized and demonstrated to form well-defined unilamellar vesicles in water by cryo-electron microscopy.
  Chemical Communications 10/2005; · 6.17 Impact Factor