Xinglin Guo

Salt‐Tolerant Superoleophobicity on Alginate Gel Surfaces Inspired by Seaweed (Saccharina japonica)

Dr. Y. Cai, Prof. X. Guo, Prof. L. Jiang Beijing National Laboratory for Molecular Sciences (BNLMS) Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 , PR China E-mail: jianglei@iccas.ac.cn Prof. J. Qiao SINOPEC Beijing Research Institute of Chemical Industry Beijing 100013 , PR China E-mail: qiaojl.bjhy@sinopec.com Prof. S. T. Wang Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 , PR China Prof. L. Jiang School of Chemistry and Environment Beihang University Beijing 100191 , PR China Dr. Y. Cai Graduate School of Chinese Academy of Sciences Beijing 100049 , PR China Q. Lu Institute of Materials Sciences and Engineering Ocean University of China Qingdao 266100 , PR China

Carbon nanotube/poly(2,4-hexadiyne-1,6-diol) nanocomposites prepared with the aid of supercritical CO2

Poly(2,4-hexadiyne-1,6-diol)(poly(HDiD)) was coated on the outer walls of carbon nanotubes (CNTs) with the aid of supercritical CO(2), resulting in poly(HDiD)/CNT nanocomposites, which possess optical properties originated from poly(HDiD).

A synergy effect between the hydrophilic PEG and rapid solvent evaporation induced formation of tunable porous microspheres from a triblock copolymer

A uniform Evansblue-loaded biodegradable amphiphilic poly(lactide-co-glycolide-b-ethylene glycol-b-lactide-co-glycolide)(PLGE) porous microsphere prepared by a synergy effect between the hydrophilic PEG and rapid solvent evaporation is reported. Our approach is based on the double emulsion (W/O/W) in which solvent evaporates rapidly. We show the introduction of hydrophilic PEG and rapid solvent evaporation play an important role in the formation of biodegradable porous microspheres. The microsphere size, pore size and distribution as well as drug loading efficiency can be well controlled by varying the polymer compositions. Meanwhile, the drug release behaviors of PLGE porous microspheres are also discussed.

Controllable drug release and effective intracellular accumulation highlighted by anisotropic biodegradable PLGE nanoparticles

Control of the stretching or compressing ratio of spherical nanoparticles (NPs) leads to a dramatic change in the shape and size of particles based on amphiphilic biodegradable poly(lactide-co-glycolide-b-ethylene glycol-b-lactide-co-glycolide) (PLGE) triblock copolymers. Drug release, endocytosis and intracellular accumulation tests on these anisotropic PLGE NPs show significantly enhanced properties in comparison with spherical NPs, indicating they are good candidates for drug delivery.

Folding and birefringence behavior of poly(vinyl alcohol) hydrogel film induced by freezing and thawing

Band-like folds with high aspect ratio and birefringence behavior were observed on an in situ formed thin poly(vinyl alcohol) (PVA) hydrogel film via freezing–thawing treatment of PVA aqueous solution coated on glass. The crystallites generated during the freezing of the PVA solution cross-linked the PVA to form the hydrogel film. The volume expansion of the hydrogel film due to the absorption of condensed water in thawing induced the formation of folds. These folds show interesting birefringence behavior. The morphology, crystallization and birefringence behavior of the folds were characterized by polarized optical microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. A plausible principle for the fold formation is also discussed. It has been found that the moderate interaction between the hydrogel film and the substrate and the existence of condensed water on the frozen hydrogel film play important roles in the appearance of the folds.

Nonswellable hydrogels with robust micro/nano-structures and durable superoleophobic surfaces under seawater

Hydrogels, composed mainly of water trapped in three dimensional cross-linked polymer networks, have been widely utilized to construct underwater superoleophobic surfaces. However, the swelling nature and instability of hydrogels under complex marine environment will weaken their underwater superoleophobicity. Herein, we synthesize structured poly (2-hydroxyethylmethacrylate) (PHEMA) hydrogels by using sandpaper as templates. The robust non-swelling of PHEMA hydrogel ensures that micro/nano-structures on the surface of PHEMA hydrogels can be well maintained. Moreover, when roughness Ra of about 3∼4 μm, the surface has superior oil-repellency. Additionally, even after immersing in seawater for one-month, their breaking strength and toughness can be well kept. The non-swellable hydrogels with long-term stable under seawater superoleophobicity will promote the development of robust superoleophobic materials in marine antifouling coatings, biomedical devices and oil/water separation.