Natural biomaterials are now frequently used to build biocarrier systems,which can carry medications and biomolecules to a target region and achieve a desired therapeutic effect.Biomaterials and polymers are of great ...Natural biomaterials are now frequently used to build biocarrier systems,which can carry medications and biomolecules to a target region and achieve a desired therapeutic effect.Biomaterials and polymers are of great importance in the synthesis of nanomaterials.The recent studies have tended to use these materials because they are easily obtained from natural sources such as fungi,algae,bacteria,and medicinal plants.They are also biodegradable,compatible with neighborhoods,and non-toxic.Natural biomaterials and polymers are chemically changed when they are linked by cross linking agents with other polymers to create scaffolds,matrices,composites,and interpenetrating polymer networks employing microtechnology and nanotechnology.This review highlights how microengineered and nanoengineered biomaterials are utilized to produce efficient drug-delivery systems and biomedical and biological therapies and how innovative sources of biomaterials have been identified.展开更多
A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microsc...A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）.The Pd micro-nanoparticles were prepared on a COOH-CNTs/PI membrane as a comparative sample.The XRD and SEM investigations for Pd electrodeposition demonstrate that the particle size of Gr/PI composite membrane is smaller than that of COOH-CNTs/PI membrane,while the uniform and dense distribution of Pd micro-nanoparticles on the Gr/PI composite membrane is greater than that on the COOH-CNTs/PI membrane.The electrocatalytic properties of Pd/Gr/PI and Pd/COOH-CNTs/PI catalysts for the oxidation of formic acid were investigated by cyclic voltammetry（CV） and chronoamperometry（CA）.It is found that the electrocatalytic activity and stability of Pd/Gr/PI are superior to those of Pd/COOH-CNTs/PI catalyst.This is because smaller metal particles and higher dense distribution desirably provide abundant catalytic sites and mean higher catalytic activity.Therefore,the Pd/Gr/PI catalyst has better catalytic performance for formic acid oxidation than the Pd/COOH-CNTs/PI catalyst.展开更多
文摘Natural biomaterials are now frequently used to build biocarrier systems,which can carry medications and biomolecules to a target region and achieve a desired therapeutic effect.Biomaterials and polymers are of great importance in the synthesis of nanomaterials.The recent studies have tended to use these materials because they are easily obtained from natural sources such as fungi,algae,bacteria,and medicinal plants.They are also biodegradable,compatible with neighborhoods,and non-toxic.Natural biomaterials and polymers are chemically changed when they are linked by cross linking agents with other polymers to create scaffolds,matrices,composites,and interpenetrating polymer networks employing microtechnology and nanotechnology.This review highlights how microengineered and nanoengineered biomaterials are utilized to produce efficient drug-delivery systems and biomedical and biological therapies and how innovative sources of biomaterials have been identified.
基金Project(51372106)supported by the National Natural Science Foundation of China
文摘A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）.The Pd micro-nanoparticles were prepared on a COOH-CNTs/PI membrane as a comparative sample.The XRD and SEM investigations for Pd electrodeposition demonstrate that the particle size of Gr/PI composite membrane is smaller than that of COOH-CNTs/PI membrane,while the uniform and dense distribution of Pd micro-nanoparticles on the Gr/PI composite membrane is greater than that on the COOH-CNTs/PI membrane.The electrocatalytic properties of Pd/Gr/PI and Pd/COOH-CNTs/PI catalysts for the oxidation of formic acid were investigated by cyclic voltammetry（CV） and chronoamperometry（CA）.It is found that the electrocatalytic activity and stability of Pd/Gr/PI are superior to those of Pd/COOH-CNTs/PI catalyst.This is because smaller metal particles and higher dense distribution desirably provide abundant catalytic sites and mean higher catalytic activity.Therefore,the Pd/Gr/PI catalyst has better catalytic performance for formic acid oxidation than the Pd/COOH-CNTs/PI catalyst.
