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Vanesa Romero, Soraia P S Fernandes, Laura Rodriguez-Lorenzo, Yury V Kolen'ko, Begoña Espiña, Laura M Salonen
A novel procedure for the preparation of magnetic covalent organic frameworks (COFs) is reported. In situ functionalization of Fe3O4 with dopamine rapidly afforded amino-functionalized magnetic nanoparticles, which after decoration with a COF building block and subsequent COF growth gave access to magnetic composite mTpBD-Me2. The optimized synthesis conditions yielded crystalline and superparamagnetic material with no loss in surface area as compared to bulk COF. The composite material was employed for the first time in magnetic solid-phase extraction of marine biotoxins from seawater with high efficiency, where calculated maximum adsorption capacities of 812 mg g-1 and 830 mg g-1 were found for okadaic acid (OA) and dinophysistoxin-1 (DTX-1), respectively, corresponding to an increase of ∼500-fold for OA and ∼300-fold for DTX-1 as compared to the commonly used non-magnetic macroporous resins...
March 14, 2019: Nanoscale
Hamid Rashidi Nodeh, Muhammad Afzal Kamboh, Wan Aini Wan Ibrahim, Binta Hadi Jume, Hassan Sereshti, Mohd Marsin Sanagi
A novel nanocomposite of MGO-NGC, composed of magnetic Fe3O4 nanoparticles (M), graphene oxide (GO), and N-methyl-d-glucamine functionalized calix[4]arene (NGC), was synthesized and applied as an effective adsorbent for the removal of two selected pesticides, namely hexaconazole and chlorpyrifos from water samples. The adsorbent was characterized by FTIR, SEM, EDX, TEM, and XRD. The main parameters affecting the adsorption process such as adsorbent dosage, pH of sample solution, salt effect, pesticide concentration, and adsorption time were investigated...
March 14, 2019: Environmental Science. Processes & Impacts
Sandhra M Carvalho, Alice G Leonel, Alexandra A P Mansur, Isadora C Carvalho, Klaus Krambrock, Herman S Mansur
Glioblastoma is the most aggressive primary brain cancer, which has no cure yet. Emerging nanotheranostic alternatives such as magnetic iron oxide nanoparticles (MIONs) have great potential as multimodal cancer therapy mediators. They can act as nanocarriers of anticancer drugs and generate localized heat when exposed to an alternating magnetic field (AMF), resulting in combined effects of chemotherapy and magnetic hyperthermia therapy. Thus, we designed and synthesized novel MIONs directly through a co-precipitation method by a single step one-pot aqueous green process using carboxymethylcellulose (CMC) as a multifunctional, biocompatible and water-soluble biopolymer ligand (iron oxide nanoparticle-CMC, MION@CMC)...
March 14, 2019: Biomaterials Science
Lin Wu, Ling Zong, Haihua Ni, Xuexue Liu, Wen Wen, Lei Feng, Jin Cao, Xueyong Qi, Yanru Ge, Song Shen
Smart micelles which undergo dramatic property changes in response to temperature have aroused extensive interest in specific cancer therapy. To date, studies on thermosensitive polymers have mainly focused on lower critical solution temperature (LCST) polymers. Materials with upper critical solution temperature (UCST) which can swell and disassemble at elevated temperatures have much less been documented, although they have been reported to be ideal carriers for quick and complete drug release upon applying a stimulus...
March 14, 2019: Biomaterials Science
Yuan Cao, Muhammad Hassan, Yue Cheng, Zhongrong Chen, Meng Wang, Xiaozhang Zhang, Zeeshan Haider, Gang Zhao
Tuning ice recrystallization (IR) has attracted tremendous interest in fundamental research and a variety of practical applications, including food and pharmaceutical engineering, fabrication of anti-icing coating and porous materials, and cryopreservation of biological cells and tissues. Although great efforts have been devoted for modulation of IR for better microstructure control of various materials, it still remains a challenge, especially in cryopreservation, where insufficient suppression of IR during warming is fatal to the cells...
March 13, 2019: ACS Applied Materials & Interfaces
Yanhao Zhang, Yuanyuan Song, Jie Wu, Ruijin Li, Di Hu, Zian Lin, Zongwei Cai
A magnetic covalent organic framework nanomaterial (Fe3O4@COFs) served as an adsorbent for enrichment and a new matrix for SALDI-TOF-MS analysis of PAHs and their derivatives in PM2.5. The unique properties of Fe3O4@COFs in terms of high enrichment ability and matrix-free interference made it possible for sensitive analysis of low-concentration organic small-molecule pollutants in complex environmental samples.
March 12, 2019: Chemical Communications: Chem Comm
Yixin Zhong, Yu Zhang, Jie Xu, Jun Zhou, Jia Liu, Man Ye, Liang Zhang, Bin Qiao, Zhi-Gang Wang, Hai-Tao Ran, Dajing Guo
Multimodal molecular imaging has shown promise as a complementary approach to thrombus detection. However, the simultaneous noninvasive detection and lysis of thrombi for cardiovascular diseases remain challenging. Herein, perfluorohexane (PFH)-based biocompatible nanostructure was fabricated, namely, as-prepared Fe3O4-poly (lactic-co-glycolic acid)-PFH-CREKA nanoparticles (NPs), which combine phase transition (PT) thrombolysis capabilities with properties conducive to multimodal imaging. This well-developed PT agent responded effectively to low-intensity focused ultrasound (LIFU) by triggering the vaporization of liquid PFH to achieve thrombolysis...
March 11, 2019: ACS Nano
Ebrahim Alipanahpour Dil, Arash Asfaram, Fardin Sadeghfar
Herein, the CuO/ZnO@Fe3O4-carbon nanotubes (CNTs)-nanocomposite (NC), as a sorbent for magnetic dispersive micro-solid phase extraction, was developed for the determination of chlorogenic acid (CGA) in the medical extract of plants, food, and water samples in combination with high-performance liquid chromatography. The CuO/ZnO@Fe3O4-CNTs-NC was characterized by FESEM, EDS, XRD, TEM, BET, FT-IR, and VSM. Significant parameters (pH, temperature, eluent volume, vortex time, sonication time, CuO/ZnO@Fe3O4-CNTs-NC mass, and desorption time) that affected the extraction efficiency of CGA were optimized using Plackett-Burman as the screening design and the central composite design as the optimization strategy...
March 11, 2019: Analyst
Jiusheng Bao, Shaodi Zhao, Yan Yin, Xingming Xiao, Mark E Tuttle, Tonggang Liu
BACKGROUND: The brake is an important safety protection device for mine hoists, in which the performance of the brake shoe affects directly the safe operation of hoisting system. In order to solve problems such as high wear rate and unstable friction coefficient of brake shoe under high temperature, this paper indicated that adding magnetic powder to the composite material of traditional mine hoist's brake shoe will be a creative and effective approach to improve its properties. METHODS: Several new formulas of brake shoe material were designed in the presence of Nano-Fe3O4 and Nd-Fe-B, and the methods of both preparation and performance testing of the magnetic brake shoes were introduced...
March 8, 2019: Recent Patents on Nanotechnology
Chunmiao Liu, Baochan Yang, Xue Chen, Zunfu Hu, Zhichao Dai, Dongjiang Yang, Xiuwen Zheng, Xilin She, Qingyun Liu
Circulating tumor cells (CTCs) were kind of rare cells that firstly shed from solid tumors and then existed in the bloodstream. The effective capture and separation of CTCs have significant meanings in cancer's diagnosis and prognosis. In this study, novel Fe3O4-FePt magnetic nanocomposites (Fe3O4-FePt MNCs) were constructed by integrating face centered cubic (fcc) FePt nanoparticles (NPs) onto the surface of the Fe3O4@SiO2 core. After further modified with NH2-PEG-COOH and tumor-targeting molecule tLyP-1, the acquired Fe3O4-FePt MNCs with excellent biocompatibility and stability could efficiently target and capture tLyP-1 receptor-positive CTCs...
March 8, 2019: Nanotechnology
Ying Zhou, Changzhong Liao, Zhengyuan Zhou, ChungKai Chang, Kaimin Shih
This work evaluated the feasibility of using low-temperature thermal immobilization based on the reaction mechanism forming the melanotekite (Pb2Fe2Si2O9) crystal phase to stabilize lead (Pb) containing waste. X-ray diffraction demonstrated that Pb could be incorporated into the melanotekite structure at easily attainable treatment temperatures (less than 500 °C) by magnetite and SiO2 precursors. The γ-Fe2O3 intermediate was found to play a key role in initializing melanotekite crystallization at a much lower temperature than that in traditional thermal immobilization techniques...
March 7, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Rong Wu, Qianhao Min, Jingjing Guo, Tingting Zheng, Li-Ping Jiang, Jun-Jie Zhu
Due to the outstanding synergistic effects and low-toxicity, combination therapy exhibits more considerable potential in antitumor activity than monotherapy. Herein, a core-shell magnetic gold nanostar (Fe3O4@GNS, MGNS)-based system for co-delivery of a mitochondrial targeting amphipathic tail-anchoring peptide (ATAP) and a membrane-associated cytokine (tumor-necrosis-factor-related apoptosis-inducing ligand (TRAIL) was constructed. The magnetic core can facilitate delivery of the drug vehicle by external magnetic field, which results in accurate accumulation and enhances tumor cellular uptake for preliminary targeting...
March 1, 2019: Analytical Chemistry
Jiazhuo Xie, Yuechao Yang, Bin Gao, Yongshan Wan, Yuncong C Li, Dongdong Cheng, Tiqiao Xiao, Ke Li, Yanan Fu, Jing Xu, Qinghua Zhao, Yanfei Zhang, Yafu Tang, Yuanyuan Yao, Zhonghua Wang, Lu Liu
Despite commercialized slow-release fertilizers coated with petrochemical polymers have revolutionarily promoted agricultural production, more research should be devoted to developing superhydrophobic biopolymer coatings with superb slow-release ability from sustainable and ecofriendly biomaterials. To inform the development of the superhydrophobic biopolymer-coated slow-release fertilizers (SBSF), the slow-release mechanism of SBSF needs to be clarified. Here, the SBSF with superior slow-release performance, water tolerance and good feasibility for large-scale production was self-assembly fabricated using a simple, solvent-free process...
February 28, 2019: ACS Nano
Youngmoo Jeon, Jeongyeon Lee, Myungjin Kim, Jiseop Oh, Taejin Hwang, Yuanzhe Piao
Molybdenum disulfide (MoS2) is a promising anode material for lithium-ion batteries owing to its high theoretical capacity and low cost. However, it exhibits low electrical conductivity and volume expansion, resulting in poor electrochemical performance. In this work, three-dimensional porous carbon/MoS2 composites with Fe3O4 nanoparticles (C-MF) are synthesized via a mix-bake-wash method. The few-layered MoS2 in the porous carbon matrix provides improved electrical conductivity and facilitates lithium ion diffusion, so the composites exhibit a high specific capacity of 939...
February 28, 2019: Nanoscale
Dan Xue, Qingbo Meng, Xi-Ming Song
In this article, we describe a method to fabricate magnetic responsive Janus nanosheets with catalytic property via surface protection method. Fe3O4 nanoparticles and PW12O403- based ionic liquid are located on the two opposite sides of the Janus nanosheets, respectively. The Janus nanosheets are characterized by FTIR, SEM, TEM, AFM and Zeta-potential analysis. They are used as recyclable catalyst to the esterification reaction of methanol and oleic acid for their magnetic responsive and catalytic properties...
February 22, 2019: ACS Applied Materials & Interfaces
Man Ye, Jun Zhou, Yixin Zhong, Jie Xu, Jingxin Hou, Xingyue Wang, Zhi-Gang Wang, Dajing Guo
Atherosclerosis is a major cause of sudden death and myocardial infarction, instigated by unstable plaques. Thus, the early detection of unstable plaques and corresponding treatment can improve the prognosis and reduce mortality. In this study, we describe a protocol for the preparation of nanoparticles (NPs) combined with the phase transitional material perfluorohexane (PFH) and with dextran sulfate (DS) targeting class A scavenger receptors (SR-A) for the diagnosis and treatment of atherosclerotic vulnerable plaques...
February 20, 2019: ACS Applied Materials & Interfaces
Ali Reza Sardarian, Milad Kazemnejadi, Mohsen Esmaeilpour
New Fe3O4@SiO2 core-shell superparamagnetic nanoparticles functionalized by a bis-salophen Schiff base Pd complex were synthesized and employed as an efficient magnetic nanocatalyst in the Heck and Sonogashira cross coupling reactions. The synthesized nanostructures were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), elemental analysis (CHN), cyclic voltammetry (CV), Brunauer-Emmett-Teller analysis (BET), and UV-vis spectroscopy...
February 18, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Apurve Saini, Max Wolff
The effect of small quantities of magnetic polymer nanocomposite (formed by surfactant Pluronic F127 @ Fe3O4 nanoparticles of 10 nm and 30 nm diameters) on the crystallization behavior of Pluronic F127 micelles solvated by 20 % in water was investigated in the vicinity of hydrophilic and hydrophobic interfaces. Introducing magnetic nanoparticle at core imparts magnetic properties to the polymeric micelle and increases its hydrodynamic diameter. These magnetic polymer nanocomposites act as defects in the Pluronic crystal and hinder crystallization in comparison to pure Pluronic F127 micelles behavior...
February 15, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
J Mejía-López, E Tangarife, J Mazo-Zuluaga
Interest in low dimensional magnetic systems has been growing due to the novel and dramatically differentiated effects of their physical properties, which give them special behaviors and uses in biomedical, environmental and technological fields. In this study we report extensive first-principles calculations on the geometric optimization as well as electronic, magnetic, mechanical and thermal properties of several quasi one-dimensional core/shell nanowires: Cu/Fe3O4, Co/Fe3O4, and CoO/Fe3O4. The main focus lies on the quantum confinement effects as well as on the effect of the interaction between the ferrimagnetic semiconductor shell material (magnetite nanotube) and core compounds with differentiated magnetic behavior such as (i) a ferromagnetic material (Co), (ii) an antiferromagnetic transition metal oxide (CoO) and (iii) a non-magnetic simple metal (Cu)...
February 11, 2019: Physical Chemistry Chemical Physics: PCCP
Haiqiang Luo, Keyu Tao, Yun Gong
K-doped FeOOH/Fe3O4 nanoparticles with a size of 100 nm were grown on stainless steel (SS) hydrothermally. The effect of the synthetic conditions on compositions, morphologies and electrochemical performances was discussed, and the possible synthetic mechanism was proposed. The obtained K-doped FeOOH/Fe3O4/SS demonstrated a superior specific capacity of 396 mA h g-1 (0.554 mA h cm-2) at 1 A g-1 in 2 M KOH, which is the largest value reported so far. And it was also much larger than those of K-doped and -undoped FeOOH/SS samples...
January 30, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
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