P3HT STRIPE STRUCTURE WITH ORIENTED NANOFIBRILS ENABLED BY CONTROLLED INCLINING EVAPORATION

The preparation of the poly（3-hexylthiophene） （P3HT） stripe structure with oriented nanofibrils prepared by controlled inclining evaporative technique is reported. The distance of the adjacent stripes could be controlled from 40 μm to 100 μm by decreasing the inclining angle. The oriented nanofibrils in the stripes can be obtained because the P3HT lamellae diffuse directionally and form 1D crystals at the three-phase contact line of the drop. In order to get the oriented P3HT stripes, the proper solvent evaporation rate which is controlled by the inclining angle and the wettability of the substrate must be carefully chosen to match the P3HT 1D crystallization rate. It is found that large inclining angle and the hydrophilic substrate （for example： glass and PEDOT） are beneficial to get P3HT stripe structure with oriented nanofibrils.

Effect of neodymium and yttrium addition on microstructure and DC soft magnetic property of dual-phase FeCoNi(CuAl)_(0.8)high-entropy alloy

The correlation between the microstructure and soft magnetic properties under the direct current(DC)mode of dual-phase FeCoNi(CuAl)_(0.8)RE_(0.05)(RE=Nd,Y)high-entropy alloys(HEAs)was investigated.Xray diffraction(XRD)and electron backscattered diffraction(EBSD)results show that all samples consist of face-centered cubic(FCC)and body-centered cubic(BCC)phases.In comparison to the volume fraction of BCC phase of the RE-free HEA(25.3%),Nd and Y additions dramatically increase it to 42.0%and 43.3%,which leads to an increase of the saturation magnetization.RE addition reduces the average grain size from 7.26 wm of the RE-free HEA to 5.42μm of RE=Nd HEA and 4.88μm of RE=Y HEA.Stripe magnetic domain structure is observed in both FCC and BCC phases in the RE-free and RE-containing HEAs.The additives of Nd and Y both decrease the stripe pattern width in FCC and BCC phases.The refined structure and finely spaced stripe domain by RE addition can decrease the remanence.Compared with the RE-free HEA,RE addition can effectively enhance the DC soft magnetic property by decreasing the remanence,the coercivity,and the hysteresis loss.

Fabrication of virus-like particles with strip-pattern surface：A two-step self-assembly approach

Spherical nanostructures with striped patterns on the surfaces resembling the essential structures of natural virus particles were constructed through a two-step self-assembly approach of polystyrene-boligo（acrylic acid）（PS-b-oligo-AA） and poly（γ-benzyI L-glutamate）-b-poly（ethylene glycol）（PBLG-bPEG） copolymer mixtures in solution.On the basis of difference in hydrophilicity and self-assembly properties of the two copolymers,the two-step self-assembly process is realized.It was found that PS-boligo-AA copolymers formed spherical aggregates by adding a certain amount of water into polymer solutions in the first step.In the second step,two polymer solutions were mixed and water was further added,inducing the self-assembly of PBLG-b-PEG on the surfaces of PS-b-oligo-AA spheres to form striped patterns.In-depth study was conducted for the indispensable defects of striped patterns which are dislocations and ＋1/2 disclinations.The influencing factors such as the mixing ratio of two copolymers and the added water content in the first step on the morphology and defects of the striped patterns were investigated.This work not only presents an idea to interpret mechanism of the cooperative self-assembly behavior,but also provides an effective approach to construct virus-like particles and other complex structures with controllable morphology.