Sonochemical synthesis of flower-like ZnO assembled by hollow cones toward water vapor permeability and water resistance enhancement of waterborne film

Yan Bao,Lu Gao,Caiping Feng,Jianzhong Ma,Wenbo Zhang,Chao Liu,Demetra Simion 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

In this study,flower-like ZnO assembled by hollow cones (F-ZnO-HCs) were synthesized viasonochemical route and the related morphology and structure of product were characterized. Then,F-ZnO-HCs nanostructures were employed to polyacrylate and the effect of F-ZnO-HCs on the propertiesof waterbornefilms was investigated. Meanwhile, the morphological evolution of F-ZnO-HCs wasproposed and the superiority of F-ZnO-HCs on synchronously improving the water resistance and watervapor permeability of polyacrylatefilm was discussed. The results showed that F-ZnO-HCs possessed anaverage diameter of800 nm and a large specific surface area of 16.01 m2 g 1. Adjusting the watercontent and citric acid dosage, the morphology of ZnO transformed from F-ZnO-HCs to ZnOnanoparticles, F-ZnO-NSs, F-ZnO-SCs and F-ZnO-NRs. F-ZnO-HCs nanostructures asfillers not onlysignificantly enhance the stability of polyacrylate latex but also simultaneously improve the water vaporpermeability and water resistance of polyacrylatefilm. Moreover, compared with other morphologicalZnO, F-ZnO-HCs was the best for simultaneously improving the water resistance and water vaporpermeability of polyacrylatefilm. F-ZnO-HCs is an ideal candidate for resolving the contradiction of thewater resistance and water vapor permeability of waterbornefilms.

Cationic silicon-based gemini surfactants: Effect of hydrophobic chains on surface activity, physic-chemical properties and aggregation behaviors

Yan Bao,Jiajia Guo,Jianzhong Ma,Pan Liu,Qiaoling Kang,Jing Zhang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-

A series of cationic silicon-based gemini surfactants (Cm-PSi-Cm) having different hydrophobic chains length (m = 8,10,12,14,16,18) were synthesized. Subsequently, surface parameters including equilibrium surface tension (gCMC), critical micelle concentration (CMC), surface pressure at CMC (PCMC) and maximum surface excess (Gmax) were calculated according to the surface tension measurements. The importance of hydrophobic chains length on the surface activity of Cm-PSi-Cm was revealed in detail. With the increasing hydrophobic chains length, the equilibrium surface tension (gCMC) values follow the order of C8-PSi-C8 > C10-PSi-C10 > C12-PSi-C12< C14-PSi-C14< C16-PSi-C16< C18-PSi-C18. The thermodynamic parameters of micellization process, namely, standard Gibbs free energy (DG0 m), enthalpy (DH0 m) and entropy (DS0 m), were derived from conductivity measurements at different temperatures. The aggregation of the cationic silicon-based gemini surfactants (C12-PSi-C12) in aqueous solution at different concentrations was studied by DLS and TEM measurements. The formation of micelles and vesicles in C12-PSi-C12 solutions was observed at a concentration well above the CMC. Moreover, the morphology of vesicles changed from sphere to rod-like, dumbble-like and finally string dumbbell-like with the increasing of the surfactant concentration.

中國大陸沿海港口的分布及變化發展

이염보(Li Yanbao),구구(Qiu Ju) 한국항만경제학회 1995 韓國港灣經濟學會誌 Vol.11 No.-

In this paper, the relation between the port distribution and egional economic development is discussed by analysing the distribution, changes, and development of sea ports in Chinese mainland. Chapter I describes briefly the distribution character of the sea ports. Here introduced are surveys of 19 key ports, 7 ports of which (Shanghai, Qinhuangdao, Guangshon, Dalian, Ningbo, Tjanjin, Qingdao), have a yearly volume freight traffic of over 40 million tons. The other 12 key ports are Yingkou Yantai, Rizhao, Lianyungang, Fuzjhou, Xiamen , Shantou, Shenzhen, Zhuhai, Zhanjiang, Fangcheng and Haikou.<br/> Chapter 2 describes the history of the development of sea ports and discusses the relation between the port distribution and regional economy. The large- scale port construction began in the ear1y 1970's when China's foreign trade started to expand. M ore than 20 berthes are incread every year since 1980 and several high-efficiney specialzed terminals which can handle 100000t ships, and container terminals have been built. As for the relation between the port distribution and regional economy it can be pointed out the following:<br/> 1. The original situation for port distribution is mainly formed by naturalgeograhial conditions.<br/> 2. The port distribution is changed by the economic development and transportrequirement so the restriction of natural conditions will be broken through.<br/> 3.The port distribution is controled by the distribution of productive forces and material flow direction. The port distribution will be changed with the restructuring of industries.<br/> 4. The port and regional economy promote each other and the port function is being multi-dimensionlized.<br/> Chapter 3 predicts the planning of sea port development .Developing key ports and port groups is the tendency for modern port planning. Along the mainland coastal line 7 regions arc divided. For each region, the economicic superiority, transport requirements, the role and status of key and major portsare discussed.

Preparation of carbonated apatite nano-whiskers in SBF with ultrasonic assistance

Yanli Geng,Yanbao Li,Dongxu Li 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5

Carbonated apatite nano-whiskers were prepared in simulated body fluids (SBF) with ultrasonic assistance at 37℃. The effects of the initial pH value in the SBF solution and reaction times were investigated in this study. The calcium phosphate precipitates were examined by XRD, FTIR and TEM techniques. The results showed that the initial pH value in the SBF had an important effect on the morphology and composition of the calcium phosphate precipitates, and carbonated apatite nanowhiskers with length/diameter ratio of ~20 were obtained at an initial pH = 7.5 after ultrasonic treatment for 24 h. Carbonated apatite nano-whiskers were prepared in simulated body fluids (SBF) with ultrasonic assistance at 37℃. The effects of the initial pH value in the SBF solution and reaction times were investigated in this study. The calcium phosphate precipitates were examined by XRD, FTIR and TEM techniques. The results showed that the initial pH value in the SBF had an important effect on the morphology and composition of the calcium phosphate precipitates, and carbonated apatite nanowhiskers with length/diameter ratio of ~20 were obtained at an initial pH = 7.5 after ultrasonic treatment for 24 h.

Fabrication of mesoporous silica-covered gold nanostars for chemophototherapy

Jun Hou,Yanbao Zhao,Lei Sun,Xueyan Zou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Gold nanomaterials have attracted great interest in the fight against cancer due to their surface features. In this study, gold nanostar (GNS) cloaked with mesoporous silica (GNS@mSiO2) carriers were preparedfor controlled drug release. The GNS core presents a branched morphology with tip-to-tip diameter of80–120 nm and core of 40–60 nm. In this system, GNS not only served as photothermal agent but alsoas Raman signal enhancement matrix. After encapsulating doxorubicin (DOX) within the GNS@mSiO2carrier, hyaluronic acid (HA) was coated on the GNS@mSiO2 surface to seal the loaded-drug of channels. The obtained DOX-GNS@mSiO2/HA displayed pH/enzyme-triggered drug release and photothermalchemotherapeutic effect.

Facile One-Pot Bottom–Up Synthesis of Graphene and Ni/Graphene Nanostructures and Their Excellent Adsorption Performances

Xiaojun Tao,Shuang Wang,Yanbao Zhao,Zhiwei Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2

In this paper, a facile one-pot bottom-up approach for the preparation of graphene and Ni/graphene nanostructures at normal pressure and low temperature (150 ℃) has been developed. The graphene and Ni/graphene nanostructures were prepared by reducing hexachloro-benzene (C6Cl6 Þ with potassium in n-tetradecane (C14H30) solution without the presence of a catalyst. Meanwhile, the effect of Ni content on the specific surface area (SSA) of the final products was investigated. The testing results display that the as-prepared samples have large SSA and high C/O ratio, implying that the designed synthesis method is simple and efficient. To evaluate the adsorption performances of the samples, we select organic dye rhodamine B (RhB) as the model organic contaminant in aqueous solutions. The experimental results show that the samples possess high adsorption capacity (qmax = 943.4mg g -1), ultrafast adsorption rate (> 99%, 2 min), high adsorption efficiency ( ≥ 99.8%) and good chemical stability in a wide pH range (2–11), high salt tolerance (> 80 mg mL -1), and good reusability (> 99.5%, 9 cycles) for dye RhB from water. In particular, the samples exhibit a good property for the treatment of the raw industrial wastewater (RIW).

Dendritic porous SnO2/SiO2@polymer nanospheres for pH-controlled styptic drug release

Na Cao,Xin Xie,Yu Zhang,Yanbao Zhao,Liuqin Cao,Lei Sun 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-

Dendritic porous tin oxide/silica (DTS) nanospheres (NSs) were prepared by emulsion-condensationroute. DTS NSs have an average diameter of 80 nm and possess accessible center-radial large porechannels, which endow them high surface area, less drug diffusion resistance and more mass transport. SnO2 quantum dots (QDs) embedded in silica skeleton can be used to track the drug release behavior. DTS NSs were coated by chitosan/polymethacrylic acid and polymer shell would make them achievegreat loading capacity and pH-sensitive release for aminomethylbenzoic acid (AMBA).