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Aidin Lak, Marco Cassani, Binh T Mai, Naomi Winckelmans, David Cabrera, Elaheh Sadrollahi, Sergio Marras, Hilke Remmer, Sergio Fiorito, Lucia Cremades-Jimeno, Fred Jochen Litterst, Frank Ludwig, Liberato Manna, Francisco J Teran, Sara Bals, Teresa Pellegrino
Herein, by studying a stepwise phase transformation of 23 nm FeO-Fe3O4 core-shell nanocubes into Fe3O4, we identify a composition at which the magnetic heating performance of the nanocubes is not affected by the medium viscosity and aggregation. Structural and magnetic characterizations reveal the transformation of the FeO-Fe3O4 nanocubes from having stoichiometric phase compositions into Fe2+ deficient Fe3O4 phases. The resultant nanocubes contain tiny compressed and randomly distributed FeO sub-domains as well as structural defects...
October 18, 2018: Nano Letters
Dipak Kumar Tiwari, Mandalaparthi Phanindrudu, Vinod Kumar Aravilli, B Sridhar, Pravin R Likhar, Dharmendra Kumar Tiwari
Correction for 'Magnetically recoverable Cu0/Fe3O4 catalyzed highly regioselective synthesis of 2,3,4-trisubstituted pyrroles from unactivated terminal alkynes and isocyanides' by Dipak Kumar Tiwari et al., Chem. Commun., 2016, 52, 4675-4678.
October 17, 2018: Chemical Communications: Chem Comm
Tian Zhang, Hua Chai, Fanyu Meng, Zhenzhen Guo, Yu Jiang, Peng Miao
Herein, we have developed an ultrasensitive self-powered biosensor for miRNA assay based on biofuel cells (BFCs). The system is composed of indium tin oxide cathode and graphene oxide/gold nanoparticles/glucose oxidase anode. Redox probe of [Fe(CN)6]3- is entrapped inside porous Fe3O4 nanoparticles by DNA. However, in the presence of target miRNA, hybridization reaction occurs between miRNA and DNA, which initiates the release of [Fe(CN)6]3-. Moreover, duplex specific nuclease is further employed to trigger target recycling amplification...
October 10, 2018: ACS Applied Materials & Interfaces
Ali Bahadur, Shahid Iqbal, Muhammad Shoaib, Aamer Saeed
In this work, an anode material with improved thermal stability, charge capacity, charge capacity retention, energy density, cyclic performance, operation safety, reversible capacity, and rate capability was synthesized for battery applications. The graphene-magnetite-polyaniline (Gr-Fe3O4-PANI) nanocomposites (NCs) are believed to deliver outstanding performance owing to the collective effect of the layered graphene (Gr) and magnetite (Fe3O4) hollow rods (HRs), as well as the better conductivity of polyaniline (PANI)...
October 10, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Na Chen, Huan Shang, Shuangyi Tao, Xiaobing Wang, Guangming Zhan, Hao Li, Zhihui Ai, Jiakuan Yang, Lizhi Zhang
Converting sewage sludge into functional environmental materials has become an attractive sewage sludge disposal route. In this study, we synthesize a sewage sludge-based functional material via a facile one-pot hydrothermal carbonization method, and construct a visible light molecular oxygen activation system with hydrothermally carbonized sewage sludge (HTC-S) and oxalate, to degrade various organic pollutants at pH 5.0. It was found that iron species of HTC-S could chelate with oxalate to generate abundant H2O2 via molecular oxygen activation under visible light, and also promote the H2O2 decomposition to produce •OH for the fast organic pollutants degradation...
October 9, 2018: Environmental Science & Technology
Shijian Zhou, Weiming Jin, Yun Ding, Bo Shao, Bangbang Wang, Xu Hu, Yan Kong
Nowadays, agglomeration and leaching of metal active sites during reaction and recycle processes are considered to be a thorny problem for noble metal-based catalysts. Therefore, to make improvements, nano-gold was selected as a representative research object for many noble metals. In this study, Au nanoparticles (NPs) and magnetic γ-Fe2O3 were intercalated in situ in the walls of MCM-41 via a one-pot hydrothermal method, in which the intercalation process was preceded by co-condensation of tetraethyl orthosilicate (TEOS) with MPTS-Au complexes ((3-mercaptopropyl)-trimethoxysilane (MPTS), HAuCl4·3H2O), and a Fe3O4 sol...
October 5, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Seyed Hassan Hosseini, Sakineh Alipour, Nasrin Zohreh
Herein we developed a magnetic drug delivery system based on magnetic Fe3O4 nanoparticles with double shells of modified salep polysaccharide for delivery of doxorubicin (Dox). The drug loaded nanocarrier was synthesized in an easily way and large amounts of drug molecules was loaded into the nanocarrier. The drug loaded nanocarrier showed excellent pH responsibility in vitro and large amounts of Dox was released at lower pH (60% release) while the nanocarrier was stable at neutral pH. The hemolysis assay results showed that the nanocarrier has negligible hemolytic effects on human red blood cells and showed good biocompatibility...
October 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Simi Sui, Shan Zhu, Lina Su, Liying Ma, Chunnian He, Enzuo Liu, Fang He, Chunsheng Shi, Naiqin Zhao
3D carbon networks (3DCN) enjoy the merits of high surface area, effective mass-transfer ability and mechanical stability. The physicochemical properties of such materials not only depend on their microstructures, but also rely on the assembly forms. This work achieves different assembly forms of 3DCN on macroscale from powder, monolith to clay and reveals the relations between intermolecular forces and these assembly forms. With the "weak" van der Waals forces, only 3DCN powders are obtained. N-doping effect increases the part of "strong" van der Waals forces, which enables 3DCN assembled as a monolith and support 43000× its own weight...
October 1, 2018: ACS Applied Materials & Interfaces
Can Guo, Jiapeng He, Xinyi Wu, Qingwen Huang, Qingpeng Wang, Xinsheng Zhao, Qinghong Wang
Three-dimensional honeycomb-like carbon network encapsulated Fe/Fe3C/Fe3O4 composites are constructed via a facile pyrolysis of ferrite nitrate-PVP precursors. The nanostructures of the composites form in terms of the iron catalysis in the pyrolysis process, which greatly depends on reaction temperature and contents of raw materials. The Fe/Fe3C/Fe3O4/C composite obtained at 700 0C possesses high surface area, outstanding structural stability and fast electron/Li ion transportability. As anode for lithium-ion batteries, it displays high specific capacity (1295 mAh g-1 at 0...
September 28, 2018: ACS Applied Materials & Interfaces
Nanjun Chen, Dong Wang, Chuan Long, Yunxi Li, Chuanrui Lu, Fanghui Wang, Hong Zhu
Concentrating on the ion conductivity of anion exchange membranes (AEMs), we present a magnetic-field-oriented strategy to address the insufficient ion conductivity and the lifetime problem of AEMs used in alkali membrane fuel cells (AMFCs). Magnetic ferroferric oxide (Fe3 O4 ) is functionalized with quaternary ammonium (QA) groups to endow the QA-Fe3 O4 with ion-exchange ability. A series of aligned QA-Fe3 O4 /poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) hybrid membranes were fabricated by doping QA-Fe3 O4 in a triple-ammonium-functionalized PPO (TA-PPO) solution in an applied magnetic field...
October 21, 2018: Nanoscale
Sina Kazemifard, Hamed Nayebzadeh, Naser Saghatoleslami, Ebrahim Safakish
Recently, biodiesel production using heterogeneous catalysts has been of great concern. However, simple separation of these catalysts from product mixtures is a problem of the process. In this study, series of magnetic KOH/Fe3 O4 @Al2 O3 core-shell nanocatalysts were synthesized via the incipient wetness impregnation method and the effect of weight ratio of Fe3 O4 -to-Al2 O3 (0.15-0.35) on the catalytic performance was assessed. The samples were characterized by XRD, FTIR, BET-BJH, VSM, SEM, TEM, and EDX analyses and their basicity was measured by the Hammett indicator method...
September 24, 2018: Environmental Science and Pollution Research International
H P Ye, Y P Shi, J Shao, S W Tan, X Y Shan, L Zhang, C J Cao
Objective: To establish a method for determination the S - phenylmercapturic acid in urine by dispersive solid - phase extraction using Humic Acid/Fe(3)O(4) magnetic nanocomposite as adsorbent. Methods: The 5 ml of urine samples were adjusted to pH 1.0 and extracted by Fe3O4@HA. Then the analytes were separated on EC-C(18) capillary column and detected by HPLC-VWD. The S-phenylmercapturic acid was characterized by the retention time and quantified by peak area and external standard method. Results: The standard curves of SPMA showed significant linearity between 0...
June 20, 2018: Chinese Journal of Industrial Hygiene and Occupational Diseases
Chunyan Liang, Chen Zhan, Fanyu Zeng, Dandan Xu, Yong Wang, Weiwei Zhao, Jiaheng Zhang, Jinhong Guo, Huanhuan Feng, Xing Ma
There are two main aspects of environmental governance including monitoring and remediation, both of which are essential for environmental protection. Self-propelled micro/nanomotors (MNM) have shown promising potential for achieving on-demand tasks in environmental field, including environmental sensing and pollutant removal or degradation. However, most of the current MNM used in environmental protection can hardly accomplish the two major tasks of both monitoring and pollutant degradation. Hereby, we present a bubble-propelled mesoporous silica-coated titania (TiO2@mSiO2) bilayer tubular micro-motor with platinum (Pt) and magnetic Fe3O4 nanoparticles modified on their inner walls...
September 24, 2018: ACS Applied Materials & Interfaces
Michelle Gumpelmayer, Michel Nguyen, Gabor Molnar, Azzedine Bousseksou, Bernard Meunier, Anne Robert
Despite stated in some highly cited articles, magnetite is devoided of peroxidase activity. In fact, this very stable mixed valence FeIIO*FeIII2O3 complex is not catalytically competent to oxidize standard peroxidase substrates, especially at the biologically relevant pH value of 7.4. In addition, magnetite whose deleterious redox activity has been suspected in Alzheimer's disease brain damages, does not significantly interact with amyloid peptide Aβ in vitro, and is not able to induce, either in the presence or absence of Aβ, the reductive activation of dioxygen, the first step of an oxidative stress...
September 19, 2018: Angewandte Chemie
Huating Kong, Kai Xia, Ning Ren, Yunzhi Cui, Renduo Liu, Qingnuan Li, Min Lv, Jiye Shi, Qinglong Yan, Zhifen Cui, Chunhai Fan, Ying Zhu, Lihua Wang
Autophagy represents an important cellular response to nanoparticles (NPs), whose modulation holds great promise for developing nanomedicine. Here, we systematically studied cell autophagy responses elicited by the NP-protein corona with diverse protein corona types surrounding NPs with different sizes, shapes, and compositions. We demonstrated that these physicochemical properties of NP-protein coronas exerted a remarkable influence on cell autophagy responses. Particularly, for surface protein type-associated modulation of cell autophagy, we correlated the autophagy level to adsorbed protein type on Fe3O4 NPs...
September 27, 2018: Nanoscale
Jianxin Liu, Fenfen Xu, Ju Huang, Jinshun Xu, Yang Liu, Yuanzhi Yao, Meng Ao, Ao Li, Lan Hao, Yang Cao, Zhongqian Hu, Haitao Ran, Zhigang Wang, Pan Li
Theranostics is a new trend in the tumor research field, which involves the integration of diagnostic and therapeutic functions using imageable nanoparticles coupled with therapeutic drugs. Imaging-guided targeted delivery of therapeutics and diagnostics using nanocarriers hold great promise to minimize the side effects of conventional chemotherapy. Ultrasound microbubbles have been employed as theranostic agents over the last decade, which provide both real-time dynamic imaging for diagnosis and precise control for targeted tumor therapy...
September 19, 2018: Biomaterials Science
Tian Liang, Huanwen Wang, Dongming Xu, Ke Liao, Rui Wang, Beibei He, Yansheng Gong, Chunjie Yan
Flexible energy storage devices have become critical components for next-generation portable electronics. In the present work, a flexible quasi-solid-state lithium-ion capacitor (LIC) is developed based on graphene-based bendable freestanding films in a gel polymer electrolyte. A graphene encapsulated Fe3O4 nanocube hybrid film (rGO@Fe3O4) has been fabricated as the anode of LICs through a filtration assisted self-assembly and the subsequent thermal annealing process. In this hybrid architecture, flexible and ultrathin graphene shells uniformly enwrap the Fe3O4 within the whole film, which can effectively suppress the aggregation of Fe3O4 and also accommodate the volume change of Fe3O4 during the cycling process...
September 27, 2018: Nanoscale
Saijie Song, Yu Chong, Han Fu, Xinyu Ning, He Shen, Zhijun Zhang
The combination of chemotherapy and photothermal therapy has aroused great interest due to its better antitumor effect than either single therapy alone. Herein, we report on the development of hydroxypropyl-β-cyclodextrin functionalized Fe3 O4 /carbon nanoparticles (HFCNPs) for pH/near-infrared (NIR) responsive drug release, magnetic resonance/NIR fluorescence (MR/NIRFL) imaging-guided combined chemo/photothermal therapy. The high doxorubicin (DOX) loading capacity (61.2%) and controlled drug release by NIR irradiation and weak acid microenvironment render HFCNPs a good vector for DOX delivery and controlled release...
September 27, 2018: ACS Applied Materials & Interfaces
Minhan Zou, Jie Wang, Yunru Yu, Lingyu Sun, Huan Wang, Hua Xu, Yuanjin Zhao
Inspired by natural biological machines, lots of effort has been invested in developing artificially functional micromotors which can convert energy into movement for carrying out tasks in diverse areas. Here, we present a capillary microfluidic system with dual inner injections for one-step generation of composite structured polymer micromotors with two distinct cores of platinum (Pt) nanoparticle-integrated and iron oxide (Fe3 O4 ) nanoparticle-dispersed hydrogels. Because the flow rates of the prepolymerized fluids can be precisely tuned in the microfluidics, the diameters of the micromotors as well as the sizes and numbers of the inner cores can be well tailored to optimize the parameters of the resultant micromotors...
October 10, 2018: ACS Applied Materials & Interfaces
Ying Li, Wenkai Xu, Xueru Zhao, Yanfeng Huang, Junjun Kang, Qi Qi, Chongli Zhong
A novel molecular imprinting polymer (MIP)-based electrochemical senor, consisting of Fe3O4 nanobeads and gold nanoparticles on a reduced graphene oxide (RGO) substrate, was fabricated to detect ractopamine (RAC) in water using the reversible addition fragmentation chain transfer (RAFT) polymerization technique. The Au nanoparticles widely dispersed on RGO can significantly increase the response current for RAC detection in water, which is confirmed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and theoretical calculations...
September 13, 2018: Analyst
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