Foaming biocompatible and biodegradable PBAT/PLGA as fallopian tube stent using supercritical carbon dioxide

Tubal pregnancy is a common abnormal pregnancy manifestation,and the ordinary conservative treatment of tubal adhesion usually leads to the rupture of fallopian tube,which increases the risk of a second ectopic pregnancy.To avoid this symptom,it is suitable to implant a stent to separate the adhesion.Here we prepared the PBAT/PLGA foam as the stent material using supercritical CO_(2) foaming technology.With uniform macroporous structure and thin-wall feature,the foam possessed low compressive modulus in prevention of the possible second injury to the fallopian tube.The introduction of PLGA 50/50 improved the biodegradable capability of the foam,with a mass loss about 20% after a 12-week hydrolysis.After implanted into the ruptured fallopian tube of the rabbit model,the foam displayed excellent biocompatibility,and provided a good support to prevent tubal adhesion.As such,this work provides the foam material as a promising candidate for fallopian tube stent to remedy the tubal adhesion.

Recent developments and consideration issues in solid adsorbents for CO_2 capture from flue gas

The increase in energy demand caused by industrialization leads to abundant CO_2 emissions into atmosphere and induces abrupt rise in earth temperature. It is vital to acquire relatively simple and cost-effective technologies to separate CO_2 from the flue gas and reduce its environmental impact. Solid adsorption is now considered an economic and least interfering way to capture CO_2, in that it can accomplish the goal of small energy penalty and few modifications to power plants. In this regard, we attempt to review the CO_2 adsorption performances of several types of solid adsorbents, including zeolites, clays, activated carbons, alkali metal oxides and carbonates, silica materials, metal–organic frameworks, covalent organic frameworks, and polymerized high internal phase emulsions. These solid adsorbents have been assessed in their CO_2 adsorption capacities along with other important parameters including adsorption kinetics, effect of water, recycling stability and regenerability. In particular,the superior properties of adsorbents enhanced by impregnating or grafting amine groups have been discussed for developing applicable candidates for industrial CO_2 capture.

Different defect morphologies in polyethylene crystal induced by surface physicochemical properties

The physicochemical properties of surfaces have a great effect on the micro-morphologies of the crystal structures which are in contact with them.Understanding the interaction mechanism between the internal driving forces of the crystal and external inducing forces of the surfaces is the prerequisite of controlling and obtaining the desirable morphologies.In this work,the dynamic density functional theory was applied to construct the free energy functional expression of polyethylene(PE)lattice,and the micro-dynamic evolution processes of PE lattice morphology near the surfaces with different properties were observed to reveal the interaction mechanism at atomic scale.The results showed that the physical and chemical properties of the external surfaces synergistically affect the morphologies in both the defect shapes and the distribution of the defect regions.In the absence of the contact surfaces,driven by the oriented interactions among different CH2 groups,PE lattices gradually grow and form a defect-free structure.Conversely,the presence of contact surfaces leads to lattice defects in the interfacial regions,and PE lattice shows different self-healing abilities around different surfaces.