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MOFs‑Derived Strategy and Ternary Alloys Regulation in Flower‑Like Magnetic‑Carbon Microspheres with Broadband Electromagnetic Wave Absorption
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作者 Mengqiu Huang Bangxin Li +7 位作者 Yuetong Qian Lei Wang Huibin Zhang Chendi Yang Longjun Rao Gang Zhou Chongyun Liang Renchao Che 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期479-493,共15页
Broadband electromagnetic(EM)wave absorption materials play an important role in military stealth and health protection.Herein,metal–organic frameworks(MOFs)-derived magnetic-carbon CoNiM@C(M=Cu,Zn,Fe,Mn)microspheres... Broadband electromagnetic(EM)wave absorption materials play an important role in military stealth and health protection.Herein,metal–organic frameworks(MOFs)-derived magnetic-carbon CoNiM@C(M=Cu,Zn,Fe,Mn)microspheres are fabricated,which exhibit flower-like nano–microstructure with tunable EM response capacity.Based on the MOFs-derived CoNi@C microsphere,the adjacent third element is introduced into magnetic CoNi alloy to enhance EM wave absorption performance.In term of broadband absorption,the order of efficient absorption bandwidth(EAB)value is Mn>Fe=Zn>Cu in the CoNiM@C microspheres.Therefore,MOFs-derived flower-like CoNiMn@C microspheres hold outstanding broadband absorption and the EAB can reach up to 5.8 GHz(covering 12.2–18 GHz at 2.0 mm thickness).Besides,off-axis electron holography and computational simulations are applied to elucidate the inherent dielectric dissipation and magnetic loss.Rich heterointerfaces in CoNiMn@C promote the aggregation of the negative/positive charges at the contacting region,forming interfacial polarization.The graphitized carbon layer catalyzed by the magnetic CoNiMn core offered the electron mobility path,boosting the conductive loss.Equally importantly,magnetic coupling is observed in the CoNiMn@C to strengthen the magnetic responding behaviors.This study provides a new guide to build broadband EM absorption by regulating the ternary magnetic alloy. 展开更多
关键词 magnetic-carbon microspheres MOFs derivatives Electromagnetic wave absorption magnetic loss Broadband absorption
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Studies on Adriamycin Magnetic Gelatin Microspheres
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作者 吴传斌 魏树礼 +5 位作者 卢炜 何素梅 高文伟 王田力 李选 谢敬霞 《Journal of Chinese Pharmaceutical Sciences》 CAS 1995年第1期1-7,共7页
The preparation and properties of adriamycin magnetic gelatin microspheres(Adr- MG-ms)were reported.The synthesis of magnetic iron oxide ultrafine particle and embolization effects of magnetic gelatin microspheres(MG-... The preparation and properties of adriamycin magnetic gelatin microspheres(Adr- MG-ms)were reported.The synthesis of magnetic iron oxide ultrafine particle and embolization effects of magnetic gelatin microspheres(MG-ms)in dog were studied.Adr- MG-ms consist of 2%(w/w)of adriamycin(Adr)as the core,and 68% of gelatin and 30% of magnetite as the shell with a mean particle size of 22 μm. In vitro experiment,the release rate of drug demonstrated that the microspheres have sustained-release properties.The average diameter of magnetic iron oxide was approximately l0 nm. Transcatheter embolization with MG-ms and  ̄(99m)Tc-labelled MG-ms was performed under external magenet control in dog liver,respectively.Gamma photography and angiogram revealed that MG-ms level was almost equal both in left and right hepatic arteries without magnet,while with magnet(1200 Gs),MG-ms level in left hepatic artery(target site)was about 2.25 fold higher than in right hepatic artery,and few MG-ms in thyroid gland,brain and heart was observed.Results showed that the MG-ms is a promising embolic agent for treatment of hepatic cancer under external magnet control. 展开更多
关键词 ADRIAMYCIN Adriamycin magnetic gelatin microspheres magnetic gelatin microspheres Hepatic arterial embolization
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Macroporous magnetic poly(GMA-EGDMA-DVB) microspheres supported palladium complex as an efficient catalyst for Heck reaction 被引量:3
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作者 Ding Zhong Yuan Qiu Yu Zhang Jin Bo Dou 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第9期1062-1066,共5页
Macroporous magnetic poly(GMA-EGDMA-DVB) microspheres synthesized by suspension polymerization were used as supports for palladium catalyst.The results showed the novel magnetic catalyst can promote Heck reaction of a... Macroporous magnetic poly(GMA-EGDMA-DVB) microspheres synthesized by suspension polymerization were used as supports for palladium catalyst.The results showed the novel magnetic catalyst can promote Heck reaction of aryl halides with acrylic acid efficiently without an inert atmosphere.In addition,the novel catalyst can be conveniently recovered by applying an external magnet and reused at least five times without significant loss of its activity. 展开更多
关键词 Macroporous magnetic microspheres Heterogeneous catalyst Heck reaction PALLADIUM Suspension polymerization
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Effect of particle size on the preparation and microwave absorption properties of FeSiAl magnetically soft alloy hollow microspheres 被引量:2
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作者 Xu-dong Cai Xiao-jun Jiang +2 位作者 Wei Xie Jing-yang Mu De-fei Yin 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2018年第5期477-483,共7页
FeSiAl magnetically soft alloy hollow microspheres(MSAHMs) were prepared by self-reactive quenching technology based on Fe + Si + AI + KNO_3 reactive systems, in order to obtain absorbents with light weight, low frequ... FeSiAl magnetically soft alloy hollow microspheres(MSAHMs) were prepared by self-reactive quenching technology based on Fe + Si + AI + KNO_3 reactive systems, in order to obtain absorbents with light weight, low frequency and high efficiency. Firstly, twice-balling adhesive precursor method was used to obtain FeSiAl magnetically soft alloy agglomerate powders. Then agglomerate powders with the mesh number of 150-240, 240-325 and 325-400 were sprayed through the flame field into the quenching water. At last, FeSiAl MSAHMs with coarse(average at 86.97 μm), medium(average at 52.16 μm) and fine particles(average at 31.80 μm) were got. Effect of particle size on the phases and microwave absorption properties in low frequency band was studied by XRD and vector network analyzer. The results show that,Fe_3 Si_(0.7)Al_(0.3) and Fe_3 Si_(0.5)Al_(0.5) appear in the phase components of FeSiAl MSAHMs,which is important to improve the microwave absorption properties in low frequency. In addition, the real part(ε′) and imaginary part(ε″) of complex permittivity, the real part(μ′) and imaginary part(μ″) of complex permeability of FeSiAl MSAHMs all present the trend of fine particles > medium particles > coarse particles. The microwave absorption properties in low frequency are improved with the increasing of particle size, and the absorption peak moves to lower frequency range. The properties of fine particles are the best. Their matching thickness of samples is at 5 mm, and the minimum reflectivity is-43 dB at this thickness. The absorption frequency band lower than-10 dB is 4.6-7.6 GHz with a bandwidth of 3 GHz. 展开更多
关键词 FeSiAl magneticALLY SOFT ALLOY HOLLOW microspheres Particle size Microwave ABSORPTION properties Low frequency
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Preparation of Adriamycin Magnetic Albumin Microspheres and Their Experimental Antitumor Effects in vitro and in vivo 被引量:2
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作者 陶凯雄 陈道达 +4 位作者 陈剑英 田源 吴在德 王先松 杨秀萍 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 1999年第4期295-299,共5页
The adriamycin magnetic microspheres (ADM-MAMs) were prepared by the heat-stabilized protein methods. Their physico-chemical properties were examined; their cytotoxicities against tumor cells in vitro were assayed by ... The adriamycin magnetic microspheres (ADM-MAMs) were prepared by the heat-stabilized protein methods. Their physico-chemical properties were examined; their cytotoxicities against tumor cells in vitro were assayed by a modi-fied MTT method, and their effects were observed on the implanted gastric tumor in Wistar rats given ADM-MAMs via alimentary canal at the presence of the ex-ternal magnetic fields. The results showed that the ADM-MAMs were successful-ly prepared and had cytotoxic effect on tumor cells in vitro similar to the free ADM (P>0. 05). The inhibitory effects of ADM-MAMs on the implanted gastric tumor in vivo were significantly increased as compared with the controls (P<0.01). Our results suggested that ADM-MAMs were a new type of adriamycin (ADM) preparation and its form alteration did not affect its anticancer effects. 展开更多
关键词 ADRIAMYCIN magnetic microsphere PREPARATION CYTOTOXICITY implanted gastric tumor magnetic field
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Preparation and in vitro Release Properties of Mercaptopurine Drug-loaded Magnetic Microspheres 被引量:2
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作者 XU Haixing ZHANG Yu +7 位作者 NIU Xiaoqian WANG Ling CHEN Hui ZHANG Xi TANG Qiuhan HUANG Zhijun LIU Hui XU Peihu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第6期1231-1235,共5页
Magnetic Fe304 nanoparticles were synthesized by co-precipitation method and the mercaptopurine (MER) drug-loaded magnetic microspheres were obtained through emulsion cross-linking methods. The efficiency of this ap... Magnetic Fe304 nanoparticles were synthesized by co-precipitation method and the mercaptopurine (MER) drug-loaded magnetic microspheres were obtained through emulsion cross-linking methods. The efficiency of this approach was evaluated in terms of drug loading content (DLC), encapsulation efficiency (EE) and delivery properties in vitro, determined by high performance liquid chromatograph (HPLC). The microspheres showed good DLC values of 11.8%, as well as good EE values of 79.4%. The in vitro drug release study was carried out in phosphate buffer solution (PBS) simulated body fluid, at 37 ~C with pH=7.4. The release profiles showed an initial fast release rate, which decreased as time progressed and about 84 % had been released after 48 h. The experimental results indicated that the prepared magnetic microspheres may be useful for potential applications of MER for magnetically targeted chemotherapy. 展开更多
关键词 MERCAPTOPURINE magnetic microspheres drug loading content encapsulation efficiency
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Preparation and Characterization of Non-porous Superparamagnetic Microspheres with Epoxy Groups by Dispersion Polymerization 被引量:4
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作者 马志亚 官月平 +1 位作者 刘先桥 刘会洲 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第2期239-243,共5页
Non-porous superparamagnetic polymer microspheres with epoxy groups were prepared by dispersion polymerization of glycidyl methacrylate (GMA) in the presence of magnetic iron oxide (Fe3O4) nanoparticles coated with ol... Non-porous superparamagnetic polymer microspheres with epoxy groups were prepared by dispersion polymerization of glycidyl methacrylate (GMA) in the presence of magnetic iron oxide (Fe3O4) nanoparticles coated with oleic acid. The polymerization was carried out in the ethanol/water medium using polyvinylpyrrolidone (PVP) and 2,2’-azobisisobutyronitrile (AIBN) as stabilizer and initiator, respectively. The magnetic microspheres obtained were characterized with scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and Fourier transform infrared spectroscopy (FTIR). The results showed that the magnetic microspheres had an average size of-1μm with superparamagnetic characteristics. The saturation magnetization was found to be 4.5emu.g-1. There was abundance of epoxy groups with density of 0.028 mmol·g^-1 in microspheres. The magnetic PGMA microspheres have extensive potential uses in magnetic bioseparation and biotechnology. 展开更多
关键词 polyglycidyl methacrylate magnetic polymer microsphere dispersion polymerization epoxy groups BIOSEPARATION
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Mechanically activated starch magnetic microspheres for Cd(Ⅱ)adsorption from aqueous solution 被引量:3
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作者 Xinling Xie Xiaona Zhao +4 位作者 Xuan Luo Tongming Su Youquan Zhang Zuzeng Qin Hongbing Ji 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2021年第5期40-49,共10页
Magnetic starch microspheres(AAM-MSM)were synthesized via an inverse emulsion graft copolymerization by using mechanically activated cassava starch(MS)as a crude material,acrylic acid(AA)and acrylamide(AM)as graft cop... Magnetic starch microspheres(AAM-MSM)were synthesized via an inverse emulsion graft copolymerization by using mechanically activated cassava starch(MS)as a crude material,acrylic acid(AA)and acrylamide(AM)as graft copolymer monomers,and methyl methacrylate(MMA)as the dispersing agent and used as an adsorbent for the removal of Cd(Ⅱ)ions from aqueous solution.Fourier-transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),and vibrating sample magnetometry(VSM)were used to characterize the AAM-MSM adsorbent.The results indicated that AA,AM,and MMA were grafted to the MS,and the Fe_(3)O_(4) nanoparticles were encapsulated in the AAM-MSM adsorbent microspheres.The adsorbent exhibited a smooth surface,uniform size,and good sphericity because of the addition of the MMA and provided more adsorption sites for the Cd(Ⅱ)ions.The maximum adsorption capacity of Cd(Ⅱ)on the AAM-MSM was 39.98 mg·g^(-1).The adsorbents were superparamagnetic,and the saturation magnetization was 16.7 A·m^(2)·kg^(-1).Additionally,the adsorption isotherms and kinetics of the adsorption process were further investigated.The process of Cd(Ⅱ)ions adsorbed onto the AAM-MSM could be described more favorably by the pseudo-second-order kinetic and Langmuir isothermal adsorption models,which suggested that the chemical reaction process dominated the adsorption process for the Cd(Ⅱ)and chemisorption was the rate-controlling step during the Cd(Ⅱ)removal process. 展开更多
关键词 Mechanical activation magnetic STARCH microspheres CADMIUM ion ADSORPTION Separation Model
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A Modified Method for Preparation of Adriamycin Carried by Magnetic Albumin Microspheres 被引量:1
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作者 马建华 陈道达 田源 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2001年第3期233-235,共3页
The targeting of antineoplastic agents to restricted anatomic sites and specific target cells have been challenged clinicians all the time in cancer chemotherapy, which resulted in recent efforts to focus the effects ... The targeting of antineoplastic agents to restricted anatomic sites and specific target cells have been challenged clinicians all the time in cancer chemotherapy, which resulted in recent efforts to focus the effects of existing antitumor agents and treatments on tumor cells and spare their effects on normal cells. The drug-carrier complex, adriamycin carried by magnetic albumin microspheres (ADM-MAM) was prepared by using our discovered new and modified method. The physical feature of the prepared drug-carrier microspheres was much better than by the traditional method in comparison. The successful preparation of the drug-carrier complex, ADM-MAM, is one of the key steps for our later further researches in the targeted chemotherapy. 展开更多
关键词 ADRIAMYCIN targeted chemotherapy magnetic albumin microspheres
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Preparation of magnetic gelatin-starch microspheres and adsorption performance for bovine serum album 被引量:3
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作者 何秋星 宋平 +2 位作者 张智萍 尤卓莹 涂伟萍 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第4期1220-1226,共7页
The magnetic gelatin-starch microspheres were prepared by modified emulsion cross-linking method with glutaraldehyde as the cross-linking agent. The structure, size distribution as well as morphology of magnetic micro... The magnetic gelatin-starch microspheres were prepared by modified emulsion cross-linking method with glutaraldehyde as the cross-linking agent. The structure, size distribution as well as morphology of magnetic microspheres were investigated by FT-IR spectrometer, dynamic laser scattering analyzer and scanning electron microscope, respectively. Bovine serum album(BSA)was chosen as model protein, and the adsorption processes were carried out under diversified conditions including BSA initial concentration, p H value, adsorption time and temperature to evaluate the performance of the magnetic microspheres. The average diameter of optimized spherical magnetic microspheres is 1.6 μm with excellent dispersivity, and the saturation magnetization is found to be equal to 1.056×10-2 A·m2. The adsorption isotherm of the BSA on the magnetic microspheres basically obeys the Langmuir model, with a maximum adsorption capacity of 120 mg/g and an adsorption equilibrium constant of 1.60 mL/mg. 展开更多
关键词 magnetic microspheres gelatin starch bovine serum albumin adsorption
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Micron-sized Magnetic Polymer Microspheres for Adsorption and Separation of Cr(VI) from Aqueous Solution 被引量:1
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作者 王强 官月平 +2 位作者 刘翔 杨明珠 任秀峰 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第1期105-110,共6页
The magnetic poly-(methacrylate-divinyl benzene) microspheres with micron size were synthesized by modified suspension polymerization method. Adsorption of Cr(VI) from aqueous solution by magnetic poly-(MA-DVB) ... The magnetic poly-(methacrylate-divinyl benzene) microspheres with micron size were synthesized by modified suspension polymerization method. Adsorption of Cr(VI) from aqueous solution by magnetic poly-(MA-DVB) microspheres with surface amination was investigated. The adsorption processes were carried out under diversified conditions of pH value, adsorption time and temperature to evaluate the perlbrmance of the magnetic microspheres. The optimum pH value for Cr(VI) adsorption was found as 3. The adsorption capacity increased with adsorption time and attained an optimum at 60 rain. The adsorption processes for magnetic microspheres was endothermic reaction, and the adsorption capacity increased with increasing temperature. 展开更多
关键词 magnetic poly-(MA-DVB) microsphere surface amino group chromium adsorption adsorption condition
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Magnetic Fe3O4@mTiO2-AIPA Microspheres for Separation of Phosphoproteins and Non-phosphoproteins
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作者 TANG Qiuhan LU Qi QING Guangyan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第3期752-759,共8页
A novel phosphoprotein separation material was developed, which is constructed by a magnetic mesoporous Fe3 O4@TiO2(Fe3 O4@mTiO2) microsphere and a 5-aminoisophthalic acid(AIPA) monolayer that provides additional ... A novel phosphoprotein separation material was developed, which is constructed by a magnetic mesoporous Fe3 O4@TiO2(Fe3 O4@mTiO2) microsphere and a 5-aminoisophthalic acid(AIPA) monolayer that provides additional binding sites toward phosphate groups. The results of characteristic experiments demonstrated that Fe3 O4@mTiO2-AIPA had good dispersability, high magnetic susceptibility, and satisfactory grafting ratio of AIPA, ascribed to the large specific surface area of the inorganic substrate. Taking advantages of these features, Fe3 O4@mTiO2-AIPA was successfully utilized to separate α-casein(a typical phosphoprotein) and bovine serum albumin(BSA, a typical non-phosphoprotein) from their mixtures(molar ratio = 1:2). Through adjusting pH and polarity of solutions, the BSA and α-casein were respectively enriched in washing fraction and elution fraction. This result displays the good potential of Fe3 O4@mTiO2-AIPA for application in phosphoprotein enrichment. 展开更多
关键词 magnetic microsphere PHOSPHOPROTEIN SEPARATION α-casein
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Characterization of Fe_3O_4/P(St-MPEO) Amphiphilic Magnetic Polymer Microspheres
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作者 CHAN ALBERT S. C. YIP C. W. 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2002年第4期458-461,共4页
Amphiphilic magnetic microspheres consisting of styrene and poly(ethylene oxide) macromonomer(MPEO) were prepared by dispersion copolymerization in the presence of Fe_3O_4 magnetic fluid in an ethanol/water medium. Th... Amphiphilic magnetic microspheres consisting of styrene and poly(ethylene oxide) macromonomer(MPEO) were prepared by dispersion copolymerization in the presence of Fe_3O_4 magnetic fluid in an ethanol/water medium. The sizes of the magnetic microspheres and their distribution were characterized by means of scanning electron microscopy(SEM). The surface morphology and the average surface roughness of the microspheres were investigated by virtue of atomic force microscopy(AFM). It was found that the microspheres exhibit microscopic phase-separate and the mean square surface roughness of the microspheres increases with increasing MPEO used in the copolymerization. The amphiphilic magnetic microspheres containing 0 4-3 5 mg/g hydroxyl groups could be prepared from MPEO with different concentrations and styrene. 展开更多
关键词 Amphiphilic magnetic polymer microspherE COPOLYMERIZATION
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Toxicity of Magnetic Albumin Microspheres Bearing Adriamycin
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作者 马建华 陈道达 +1 位作者 田源 陶凯雄 《Journal of Huazhong University of Science and Technology(Medical Sciences)》 SCIE CAS 2000年第3期261-262,共2页
Magnetic albumin microspheres bearing adriamycin (ADM MAM) is a novel chemotherapeutic compound with site specific drug delivery characteristics. The acute and subacute toxic tests of the compound, local irritating ... Magnetic albumin microspheres bearing adriamycin (ADM MAM) is a novel chemotherapeutic compound with site specific drug delivery characteristics. The acute and subacute toxic tests of the compound, local irritating test and anaphylactic test were performed on mice and guinea pigs. The results showed there was no macroscopically and microscopically direct cytotoxic injuries of the compound to the animal organs or to the cells. The LD 50 value of the compound was higher than that of the single used adriamycin, indicating that the compound was less toxic than the single adriamycin and quite safe in its therapeutic dosage. Furthermore, there was also no side effects or toxic reactions to be observed on clinical patients with advanced carcinoma or gastric cancer. 展开更多
关键词 magnetic albumin microspheres ADRIAMYCIN CHEMOTHERAPY site specific targeting TOXICITY
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Preparation of biocompatible magnetic microspheres with chitosan
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作者 Mohamed K. Nasra Moustafa M. Mohamed +1 位作者 Mohamed A. Elblbesy Bothaina A. Hefney 《Journal of Biomaterials and Nanobiotechnology》 2011年第2期193-199,共7页
Microsphere is a term used for small spherical particles, with diameters in the micrometer range (typically 1μm to 1000μm (1mm)). Microspheres are sometimes referred to as microparticles. Microspheres can be manufac... Microsphere is a term used for small spherical particles, with diameters in the micrometer range (typically 1μm to 1000μm (1mm)). Microspheres are sometimes referred to as microparticles. Microspheres can be manufactured from various natural and synthetic materials. The present work we prepared chitosan magnetic microspheres (CMMS) with simple crosslinking method. The obtained CMMS were in size range of 1000-2600 nm with average particle size of 1800nm. All the essential characterizations of prepared CMMS were done and the results were in a good agreement with other magnetic microspheres prepared with different method. To test the biocompatibility of CMMS with blood, the effect of them on erythrocytes aggregation and blood hemolysis were studied. Our results showed that CMMS work as good compatible materials with blood. 展开更多
关键词 magnetic microspheres CHITOSAN
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Efficient adsorption removal and adsorption mechanism of basic fuchsin by recyclable Fe_(3)O_(4)@CD magnetic microspheres
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作者 NING Jing-heng CHEN Dong-er +6 位作者 LIU Yong-le HUANG Shou-en WANG Fa-xiang WEI Rui HU Qiong-can WEI Jia-qian SUN Chang 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第12期3666-3680,共15页
Excessive discharge of dye wastewater has brought serious harm to human health and the environment.In this paper,a magnetic absorbent,ferroferric oxide@β-cyclodextrin(Fe_(3)O_(4)@CD),was prepared for the efficient ad... Excessive discharge of dye wastewater has brought serious harm to human health and the environment.In this paper,a magnetic absorbent,ferroferric oxide@β-cyclodextrin(Fe_(3)O_(4)@CD),was prepared for the efficient adsorption removal of basic fuchsin(BF)from dye wastewater,based on the special amphiphilicity ofβ-CD and the strong magnetism of Fe_(3)O_(4).A series of influence factors including the initial dye concentration,adsorbent dosage,temperature and pH were investigated,as well as the adsorption mechanism.The results show that Fe_(3)O_(4)@CD has the best adsorption and removal effect on BF dye at room temperature and neutral pH,when the initial concentration of dye is 25 mg/L and the adsorbent dosage is 100 mg.The adsorption behavior conforms to the pseudo-second-order kinetics and the Langmuir adsorption isotherm,and the adsorption process is spontaneously endothermic.Fe_(3)O_(4)@CD adsorbed with BF dye can be rapidly separated under an external magnetic field and then easily regenerated by HCl treatment.After 5 times of recycling,the removal rate of the prepared magnetic composite on BF dye is kept above 75%.This work will provide an economic and eco-friendly technology for the treatment of the actual dye wastewater. 展开更多
关键词 Fe_(3)O_(4)@CD magnetic microspheres adsorption removal basic fuchsin
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Preparation of Dysprosium Ferrite/Polyacrylamide Magnetic Composite Microsphere and Its Characterization 被引量:3
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作者 雄泽英博 王志峰 +3 位作者 周兰香 张红 李幼荣 张明 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第3期262-265,共4页
Using the technique of microemulsion polymerization with nano-reactor, dysprosium ferrite/polyacrylamide magnetic composite microsphere was prepared by one-step method in a single inverse microemulsion. The structure,... Using the technique of microemulsion polymerization with nano-reactor, dysprosium ferrite/polyacrylamide magnetic composite microsphere was prepared by one-step method in a single inverse microemulsion. The structure, average particle size, morphology of composite microsphere were characterized by FTIR, XRD, TEM and TGA. The magnetic responsibility of composite microsphere was also investigated. The results indicate that the magnetic composite microsphere possess high magnetic responsibility and suspension stability. 展开更多
关键词 dysprosium ferrite POLYACRYLAMIDE composite microsphere magnetic polymer microsphere rare earths
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Study on Magnetic Responsibility of Rare Earth Ferrite/Polyacrylamide Magnetic Microsphere 被引量:2
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作者 张明 王志峰 +3 位作者 张红 代少俊 邱关明 冈本弘 《Journal of Rare Earths》 SCIE EI CAS CSCD 2005年第3期285-287,共3页
In inverse microemulsion, rare earth ferrite/polyacrylamide magnetic microsphere were prepared and their magnetic responsibility were studied by magnetic balance. Results indicate that the magnetic responsibility of m... In inverse microemulsion, rare earth ferrite/polyacrylamide magnetic microsphere were prepared and their magnetic responsibility were studied by magnetic balance. Results indicate that the magnetic responsibility of microsphere relates to magnetic moment of rare earth ion, and it can be improved by the addition of dysprosium ion of high magnetic moment. Dysprosium content has an effect on magnetic responsibility of dysprosium ferrite/polyacrylamide magnetic microsphere. The microsphere displays strong magnetic responsibility when the molar ratio of Dy3+/iron is 0.20. 展开更多
关键词 rare earth ferrite magnetic microsphere magnetic responsibility rare earths
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Preparation and characterization of composite microspheres of nano zinc ferrite/poly(D,L-lactide-co-alanine) 被引量:3
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作者 曹雷健 周勤华 +4 位作者 谷俐 沈红霞 李清华 兰平 方燕 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期360-365,共6页
Magnetic nano zinc ferrite fliuds were synthesized using an improved liquid phase chemical method, which would be used to replace tradditional iron oxides magnetic material. A novel copolymer (PLAA) with D, L-lacti... Magnetic nano zinc ferrite fliuds were synthesized using an improved liquid phase chemical method, which would be used to replace tradditional iron oxides magnetic material. A novel copolymer (PLAA) with D, L-lactide (D, L-LA) and alanine was synthesized using stannous octoate as initiator. Magnetic polymer microspheres were fabricated with nano zinc ferrite fluid coated with alanine modified poly lactide. These as-prepared zinc ferrite fluids, modified poly lactide and magnetic composites, were characterized with X-ray diffraction diffractometer, FT-IR spectrometer, nuclear magnetic resonance spectrometer, scanning electron microscope, transmission electron microscope, vibrating sample magnetometer, and thermogravimetric analyzer. The results demonstrate that the as-prepared zinc ferrite is spinel type of ZnFe2O4 nano crystals with particle size of 20-45 nm and magnetization of 32×10^-3 A.m2. Alanine is copolymerized with lactide, and the prepared composite magnetic microsphere is coated with the modified polylactide, with mass fraction of 45.5% of PLA, particle size ranging from 80-300 nm, and magnetization of 10.6×10^-3 A·m^2, which suggests ZnFe2O4 enjoys a stable magnetization after being coated by polymer. 展开更多
关键词 zinc ferrite ALANINE POLYLACTIDE magnetic composite microsphere
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Intra-articular delivery of tetramethylpyrazine microspheres with enhanced articular cavity retention for treating osteoarthritis 被引量:5
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作者 Xiuping Zhang Yang Shi +2 位作者 Zhiyue Zhang Zhenlei Yang Guihua Huang 《Asian Journal of Pharmaceutical Sciences》 SCIE CAS 2018年第3期229-238,共10页
Tetramethylpyrazine(TMP) is a traditional Chinese herbal medicine with strong antiinflammatory and cartilage protection activities, and thus a promising candidate for treating osteoarthritis. However, TMP is rapidly c... Tetramethylpyrazine(TMP) is a traditional Chinese herbal medicine with strong antiinflammatory and cartilage protection activities, and thus a promising candidate for treating osteoarthritis. However, TMP is rapidly cleared from the joint cavity after intra-articular injection and requires multiple injections to maintain efficacy. The aim of this study was to encapsulate TMP into poly(lactic-co-glycolic acid)(PLGA) microspheres to enhance the TMP retention in the joint, reducing injection frequencies and decreasing dosage. TMP microspheres were prepared by emulsion/solvent evaporation method. The intra-articular retention of the drug was assessed by detecting the drug concentration distributed in the joint tissue at different time points. The therapeutic effect of TMP microspheres was evaluated by the swelling of knee joints and histologic analysis in papain-induced OA rat model. The prepared freezedried microspheres with a particle size of about 10 μm can effectively prolong the retention time of the drug in the articular cavity to 30 d, which is 4.7 times that of the TMP solution.Intra-articular injection of TMP microspheres efficiently relieved inflammatory symptoms,improved joint lesions and decreased the depletion of proteoglycan. In conclusion, intraarticular injection of TMP loaded microspheres was a promising therapeutic method in the treatment of OA. 展开更多
关键词 OSTEOARTHRITIS TETRAMETHYLPYRAZINE INTRA-ARTICULAR injection PLGA microspheres RETENTION pharmacodynamics
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