To achieve the controllable release of energy of nitrocellulose-based propellants,this paper combines the cellulose-based nanocomposites aqueous coating(Surelease®-NC)with fluidized bed coating equipment to succe...To achieve the controllable release of energy of nitrocellulose-based propellants,this paper combines the cellulose-based nanocomposites aqueous coating(Surelease®-NC)with fluidized bed coating equipment to successfully prepare the coated spherical propellant for the first time.The effects of fluidized bed coating temperature,air velocity,flow speed and atomization pressure on the adhesion rate,coating integrity and coating uniformity of the coated spherical propellant were investigated,and the preparation of coated spherical propellant with homogeneous size and structural integrity was achieved for the first time.The microscopic morphology,chemical structure,water vapor adsorption behavior,combustion performance,and ageing resistance property of the coated spherical propellant were systematically investigated by,Fourier transforms infrared spectroscopy(FTIR),Micro confocal raman spectrometer,field scanning electron microscopy(SEM),dynamic vapor adsorption techniques,and closed bomb test,confirming the surface core-shell structure and the tightly bonded interfacial structure of coated spherical propellant.Meanwhile,the coated spherical propellant has good hygroscopic,excellent progressive burning and long storage stability.展开更多
A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine base...A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and XPS.The dual responsive behaviors of MSNs-g-PVNM were systematically studied.With imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,respectively.The release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 nm.The loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three rinses.It was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.展开更多
Metal-organic frameworks(MOFs)represent a class of multifunctional hybrid materials distinguished by their tunable structural architectures,adjustable pore dimensions,and tailorable surface chemical functionalities,wh...Metal-organic frameworks(MOFs)represent a class of multifunctional hybrid materials distinguished by their tunable structural architectures,adjustable pore dimensions,and tailorable surface chemical functionalities,which underpin their broad applicability across diverse domains.Within the cosmetics industry,MOFs exhibit significant application potential owing to their high thermal and chemical stability,substantial loading capacity,low biological toxicity,favorable luminescent characteristics,and robust catalytic activity,leading to their increasing deployment in various cosmetic-related applications.This article systematically outlines the structural features and functional properties of MOFs,emphasizing their suitability for integration into cosmetic systems.Furthermore,it provides a comprehensive review of recent advances in the utilization of MOFs in cosmetics,encompassing the detection of organic contaminants and metal ions,ultraviolet protection,encapsulation,and controlled release of volatile active ingredients,as well as targeted delivery of dermatological therapeutic agents.The structure-property-application relationships of MOFs are critically examined.Building upon the foundation of existing research,this study offers a comprehensive outlook on the future development of MOFs in the field of cosmetics.It presents several strategic perspectives,including an in-depth analysis of current application studies,the expansion of MOFs applications into additional cosmetic domains,the integration of multifunctional MOFs systems,the development of MOFs-based composite materials,and the scale-up of synthesis processes from laboratory-scale research to industrial production.It is expected that the present piece of paper can contribute valuable guidance for further exploration and practical implementation in this emerging field of cosmetics.展开更多
Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene di...Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene dimethylacrylate were used as monomers, Dibenzoyl peroxide as initiator, and cobalt naphthenate, and triethyl amine as promoters. The structures of coating materials were characterized by IR spectra. The thermogravimetric analysis result indicated that the coating materials were of good thermal stability. The mean thickness of single coating measured with screw gauge was ca. 140 μm. The morphologies of uncoated and coated fertilizer granules analyzed by using scanning electron microscopy were changed from porosities and gullies to hills and plain. The release rate of coated compound fertilizers in water could be controlled by the hydrophicity and thickness of coating. The increase in coating hydrophicity caused the increase in release rate of fertilizer. The increase in thickness of coating slowed the release rate.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.22005143)Young Elite Scientists Sponsorship Program by CAST (Grant No.2022QNRC001)。
文摘To achieve the controllable release of energy of nitrocellulose-based propellants,this paper combines the cellulose-based nanocomposites aqueous coating(Surelease®-NC)with fluidized bed coating equipment to successfully prepare the coated spherical propellant for the first time.The effects of fluidized bed coating temperature,air velocity,flow speed and atomization pressure on the adhesion rate,coating integrity and coating uniformity of the coated spherical propellant were investigated,and the preparation of coated spherical propellant with homogeneous size and structural integrity was achieved for the first time.The microscopic morphology,chemical structure,water vapor adsorption behavior,combustion performance,and ageing resistance property of the coated spherical propellant were systematically investigated by,Fourier transforms infrared spectroscopy(FTIR),Micro confocal raman spectrometer,field scanning electron microscopy(SEM),dynamic vapor adsorption techniques,and closed bomb test,confirming the surface core-shell structure and the tightly bonded interfacial structure of coated spherical propellant.Meanwhile,the coated spherical propellant has good hygroscopic,excellent progressive burning and long storage stability.
基金Project(21376271)supported by the National Natural Science Foundation of ChinaProject(2016TP1007)supported by the Hunan Provincial Science and Technology Plan Project,ChinaProjects(201810533078,S2020105330395)supported by the Undergraduates Innovative Training Foundation of Central South University,China。
文摘A light and temperature dual responsive copolymer,poly(7-(4-vinylbenzy-loxyl)-4-methylcoumarin-co-N vinyl caprolactam-co-tri(ethylene glycol)methyl ether methacrylate)(PVNM),was grafted on the surface of dopamine based mesoporous silica nanoparticles(MSNs).The resulting polymer brush,MSNs-g-PVNM,was characterized by FT-IR,TEM,TGA and XPS.The dual responsive behaviors of MSNs-g-PVNM were systematically studied.With imidacloprid as the model guest pesticide,the loading percentage and loading efficiency of the polymer brush were determined as 9.2%and 40.6%,respectively.The release efficiency of imidacloprid in MSNs-g-PVNM was the lowest value of 5.4%at 20℃ and 365 nm,and it reached the highest value of 52.4%at 50℃ and 254 nm.The loss percentage of imidacloprid on the leaves contained imidacloprid-loaded MSNs-g-PVNM(8.4%)was much less than that contained only imidacloprid(25.2%)after three rinses.It was confirmed that the release process of imidacloprid was well regulated through changing external conditions such as light and temperature.
文摘Metal-organic frameworks(MOFs)represent a class of multifunctional hybrid materials distinguished by their tunable structural architectures,adjustable pore dimensions,and tailorable surface chemical functionalities,which underpin their broad applicability across diverse domains.Within the cosmetics industry,MOFs exhibit significant application potential owing to their high thermal and chemical stability,substantial loading capacity,low biological toxicity,favorable luminescent characteristics,and robust catalytic activity,leading to their increasing deployment in various cosmetic-related applications.This article systematically outlines the structural features and functional properties of MOFs,emphasizing their suitability for integration into cosmetic systems.Furthermore,it provides a comprehensive review of recent advances in the utilization of MOFs in cosmetics,encompassing the detection of organic contaminants and metal ions,ultraviolet protection,encapsulation,and controlled release of volatile active ingredients,as well as targeted delivery of dermatological therapeutic agents.The structure-property-application relationships of MOFs are critically examined.Building upon the foundation of existing research,this study offers a comprehensive outlook on the future development of MOFs in the field of cosmetics.It presents several strategic perspectives,including an in-depth analysis of current application studies,the expansion of MOFs applications into additional cosmetic domains,the integration of multifunctional MOFs systems,the development of MOFs-based composite materials,and the scale-up of synthesis processes from laboratory-scale research to industrial production.It is expected that the present piece of paper can contribute valuable guidance for further exploration and practical implementation in this emerging field of cosmetics.
基金Supported by Natural Science Foundation of China(30571086)
文摘Controlled release NPK compound fertilizers were prepared by means of in situ polymerization of monomers on the surface of fertilizer granules at room temperature. Methacrylate, α-methyl acrylic acid, and ethylene dimethylacrylate were used as monomers, Dibenzoyl peroxide as initiator, and cobalt naphthenate, and triethyl amine as promoters. The structures of coating materials were characterized by IR spectra. The thermogravimetric analysis result indicated that the coating materials were of good thermal stability. The mean thickness of single coating measured with screw gauge was ca. 140 μm. The morphologies of uncoated and coated fertilizer granules analyzed by using scanning electron microscopy were changed from porosities and gullies to hills and plain. The release rate of coated compound fertilizers in water could be controlled by the hydrophicity and thickness of coating. The increase in coating hydrophicity caused the increase in release rate of fertilizer. The increase in thickness of coating slowed the release rate.
