The monomer of phosphorylcholine derivative,O-(5-(2-methacryloxy)-3,3-dimethyl-3-azapentyl)-O’-(ω-hydroxy-octyl)-phosphatequaternary ammonium salt,was designed and synthesized successfully.It was characterized by th...The monomer of phosphorylcholine derivative,O-(5-(2-methacryloxy)-3,3-dimethyl-3-azapentyl)-O’-(ω-hydroxy-octyl)-phosphatequaternary ammonium salt,was designed and synthesized successfully.It was characterized by the spectra ofHNMR and Mass spectra(ESI+),and every signal was assigned.Then the lubricating characteristics of the phosphorylcholinederivative were investigated on the tribological setup of ball-oh-flat.The Ultra-High Molecular Weight Polyethylene(UHMWPE)flat was rotated against a stainless steel ball with 6 mm diameter.The load was 2.3 N,which corresponded to amaximal Hertz contact pressure of 29 MPa.Water,phosphorylcholine derivative,and Acrylic Acid(AA)solution were used aslubricants,respectively.Compared with AA,the phosphorylcholine derivative shows significant lubrication.It can be stronglyhydrated under water due to the charged segment in chemical structure.The thick water layers within the chains serves asboundary lubricants,and this is thought to be the molecular origins of lubricating behavior.展开更多
In this paper, ultrafine nitrogen-doped TiO2 photocatalyst with enhanced photocatalytic water-splitting properties was successfully fabricated via a solvothermal method. Herein, polyvinylpyrrolidone（PVP） was used as...In this paper, ultrafine nitrogen-doped TiO2 photocatalyst with enhanced photocatalytic water-splitting properties was successfully fabricated via a solvothermal method. Herein, polyvinylpyrrolidone（PVP） was used as both nitrogen source and stabilizer. The enhancement in water-splitting process can be attributed to the doping of element nitrogen, which could supply an intermediate energy level and promote the separation of photo-excited holes and electrons. Moreover, this paper provides a new application of high-molecular polymer to synthesize solar-driven water-splitting photocatalysts.展开更多
基金the National Natural Science Foundation of China(50975145)the High Technology Project of Jiangsu Province(BC20077046)for their financial support
文摘The monomer of phosphorylcholine derivative,O-(5-(2-methacryloxy)-3,3-dimethyl-3-azapentyl)-O’-(ω-hydroxy-octyl)-phosphatequaternary ammonium salt,was designed and synthesized successfully.It was characterized by the spectra ofHNMR and Mass spectra(ESI+),and every signal was assigned.Then the lubricating characteristics of the phosphorylcholinederivative were investigated on the tribological setup of ball-oh-flat.The Ultra-High Molecular Weight Polyethylene(UHMWPE)flat was rotated against a stainless steel ball with 6 mm diameter.The load was 2.3 N,which corresponded to amaximal Hertz contact pressure of 29 MPa.Water,phosphorylcholine derivative,and Acrylic Acid(AA)solution were used aslubricants,respectively.Compared with AA,the phosphorylcholine derivative shows significant lubrication.It can be stronglyhydrated under water due to the charged segment in chemical structure.The thick water layers within the chains serves asboundary lubricants,and this is thought to be the molecular origins of lubricating behavior.
基金supported financially by the National Natural Science Foundation of China(Grant No.51272107 and Grant No.51572126)the Department of Education of Jiangsu Province(KYLX_0352)Fundamental Research Funds for the Central Universities(No.30920140132038)
文摘In this paper, ultrafine nitrogen-doped TiO2 photocatalyst with enhanced photocatalytic water-splitting properties was successfully fabricated via a solvothermal method. Herein, polyvinylpyrrolidone（PVP） was used as both nitrogen source and stabilizer. The enhancement in water-splitting process can be attributed to the doping of element nitrogen, which could supply an intermediate energy level and promote the separation of photo-excited holes and electrons. Moreover, this paper provides a new application of high-molecular polymer to synthesize solar-driven water-splitting photocatalysts.
