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layered double hydroxide

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https://www.readbyqxmd.com/read/28702610/new-insights-into-the-interstratification-phenomenon-in-layered-double-hydroxides-ldhs-a-comparison-of-experimental-and-computational-results-for-znal-ldh-containing-bis-tetrazole
#1
Ramin Ghiyasi, Zolfaghar Rezvani
In the present paper, successful preparation of ZnAl layered double hydroxides (LDHs) containing bis-tetrazole anions with both typical and interstratified arrangements is reported. The mechanism of the single-anion interstratified arrangement remains a long-standing and overwhelming challenge in the chemistry of LDHs. To address this issue, the arrangement of layers, the positioning of anions in the interlayer space, and the cationic ratio of layers were studied by the application of a series of laboratory methods including X-ray diffraction (XRD), thermal analyses (TGA, DTG, and DTA), elemental analysis (CHN), and energy dispersive X-ray (EDX) methods, together with computer simulations performed by using Dmol3, Forcite, and Reflex modules...
July 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28702600/an-nir-sensitive-layered-supramolecular-nanovehicle-for-combined-dual-modal-imaging-and-synergistic-therapy
#2
Shanyue Guan, Yangziwan Weng, Mengnan Li, Ruizheng Liang, Chenghua Sun, Xiaozhong Qu, Shuyun Zhou
A supramolecular nanovehicle, denoted as ICG-DOX/Gd-LDH, was synthesized by the co-intercalation of indocyanine green (ICG) and doxorubicin hydrochloride (DOX) into a gallery of Gd(3+)-doped-layered double hydroxide (Gd-LDH) such that to achieve a chemo-photothermal synergistic therapeutic agent. The unique structure of Gd-LDH can not only stabilize the photothermal agent ICG to enhance the photothermal efficiency, but also hamper the recombination between electron and holes, leading to the generation of more reactive oxygen species (ROS) under irradiation in the NIR range...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702570/a-hierarchical-cofes2-reduced-graphene-oxide-composite-for-highly-efficient-counter-electrodes-in-dye-sensitized-solar-cells
#3
Minmin Zhang, Jiantao Zai, Jie Liu, Ming Chen, Zeren Wang, Guan Li, Xuefeng Qian, Liwu Qian, Xibin Yu
Transition metal sulfides are a kind of potential candidates for efficient and stable CE materials in DSSCs due to their good electrocatalytic ability and stability towards I3(-) reduction. However, the low conductivity of sulfides is harmful for the electron collection and transfer process, and the absorption/desorption and diffusion process of I(-)/I3(-) should be optimized to achieve high electrocatalytic activity over Pt. Herein, a hierarchical CoFeS2/reduced graphene oxide (CoFeS2/rGO) composite was rationally designed and prepared via the in situ conversion of CoFe layer double hydroxide anchored on rGO...
July 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28699228/facilitating-active-species-generation-by-amorphous-nife-bi-layer-formation-on-nife-ldh-nanoarray-for-efficient-electrocatalytic-oxygen-evolution-at-alkaline-ph
#4
Xuping Sun
Searching for a simple and fast strategy to effectively enhance the oxygen evolution reaction (OER) performance of non-noble-metal electrocatalysts in alkaline media remains a significant challenge. Herein, we demonstrate that the OER activity of NiFe-LDH nanoarray on carbon cloth (NiFe-LDH/CC) in alkaline media is greatly boosted by amorphous NiFe-Borate (NiFe-Bi) layer formation on NiFe-layered double hydroxide (NiFe-LDH) surface. Such NiFe-LDH@NiFe-Bi/CC catalyst electrode only needs overpotential of 294 mV to drive 50 mA cm-2 in 1...
July 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28686412/field-assisted-splitting-of-pure-water-based-on-deep-sub-debye-length-nanogap-electrochemical-cells
#5
Yifei Wang, S R Narayanan, Wei Wu
Owing to the low conductivity of pure water, using an electrolyte is common for achieving efficient water electrolysis. In this paper, we have fundamentally broken through this common sense by using deep-sub-Debye-length nanogap electrochemical cells to achieve efficient electrolysis of pure water (without any added electrolyte) at room temperature. A field-assisted effect resulted from overlapped electrical double layers can greatly enhance water molecules ionization and mass transport, leading to electron-transfer limited reactions...
July 11, 2017: ACS Nano
https://www.readbyqxmd.com/read/28682360/membrane-interactions-and-antimicrobial-effects-of-layered-double-hydroxide-nanoparticles
#6
S Malekkhaiat Häffner, L Nyström, R Nordström, Z P Xu, M Davoudi, A Schmidtchen, M Malmsten
Membrane interactions are critical for the successful use of inorganic nanoparticles as antimicrobial agents and as carriers of, or co-actives with, antimicrobial peptides (AMPs). In order to contribute to an increased understanding of these, we here investigate effects of particle size (42-208 nm) on layered double hydroxide (LDH) interactions with both bacteria-mimicking and mammalian-mimicking lipid membranes. LDH binding to bacteria-mimicking membranes, extraction of anionic lipids, as well as resulting membrane destabilization, was found to increase with decreasing particle size, also translating into size-dependent synergistic effects with the antimicrobial peptide LL-37...
July 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28680040/high-performance-asymmetric-supercapacitor-based-on-cobalt-nickle-iron-layered-double-hydroxide-carbon-nanofibres-and-activated-carbon
#7
Feifei Wang, Shiguo Sun, Yongqian Xu, Ting Wang, Ruijin Yu, Hongjuan Li
A novel Cobalt Nickle Iron-layered double hydroxide/carbon nanofibres (CoNiFe-LDH/CNFs-0.5) composite was successfully fabricated through an easy in situ growth approach. The morphology and composition of the obtained materials were systematically investigated. When the two derived materials were used for supercapacitor electrodes, the CoNiFe-LDH/CNFs-0.5 composite displayed high specific surface area (114.2 m(2) g(-1)), specific capacitance (1203 F g(-1) at 1 A g(-1)) and rate capability (77.1% from 1 A g(-1) to 10 A g(-1)), which were considerably higher than those of pure CoNiFe-LDH...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28674955/herbicide-zn-al-layered-double-hydroxide-hybrid-composite-synthesis-and-slow-controlled-release-properties
#8
Nguyen Thi Kim Phuong, Ho Nguyen Nhat Ha, Nguyen Thi Phuong Dieu, Bui The Huy
The herbicide glyphosate (GLY) or 2,4-dichlorophenoxyacetic acids (2,4D) was intercalated in the interlayer region of a Zn-Al-layered double hydroxide (LDH) to obtain LDH-GLY or the LDH-2,4D hybrid composite because of its controlled release. Compared to the physically mixed herbicides, the LDH-herbicide hybrid composite displayed slow-release properties in decarbonated distilled water. The release rate of herbicides was found to be dependent on the carbonate and chloride anion concentrations in solution. The time at which 50% of the herbicides were released from the hybrid composite into solution, t 50, ranged from 6...
July 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28672261/synthesis-of-hierarchical-flower-like-mg2al-cl-layered-double-hydroxide-in-a-surfactant-free-reverse-microemulsion
#9
Jie Xu, Huanhuan Deng, Jiaxin Song, Jun Zhao, Li Zhang, Wanguo Hou
Hierarchical flower-like Mg2Al-Cl LDH microspheres were synthesized using a reverse surfactant-free microemulsion (SFME) route at a low temperature (∼25°C), and characterized by XRD, TEM, SEM, FT-IR, TG, N2 adsorption/desorption, and elemental analyses. The SFME used consists of n-hexane, isopropanol, and water. The so-obtained flower-like microspheres are constructed with LDH nanosheets with ∼10nm thickness. After destroyed by calcination, their crystal structure and flower-like morphology can be reconstructed by rehydration...
June 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28659062/layered-double-hydroxide-films-on-nanoporous-anodic-aluminum-oxide-aluminum-wire-a-new-fiber-for-rapid-analysis-of-origanum-vulgare-essential-oils
#10
Marzieh Piryaei
Zn/Al layered double hydroxide (LDH) films were fabricated in situ with anodic aluminium oxide aluminium as both the substrate and the sole aluminium source by means of urea hydrolysis. Headspace solid phase microextraction using LDH fibre in combination with capillary GC-MS was utilised as a monitoring technique for the collection and detection of the volatile compounds of Origanum vulgare. Experimental parameters, including the sample weight, microwave power, extraction time and humidity effect, were examined and optimised...
June 28, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28657661/topotactic-synthesis-of-porous-cobalt-ferrite-platelets-from-a-layered-double-hydroxide-precursor-and-their-application-in-oxidation-catalysis
#11
Klaus Friedel Ortega, Sven Anke, Fatih Özcan, Soma Salamon, Jsutus Heese, Corina Andronescu, Joachim Landers, Heiko Wende, Wolfgang Schuhmann, Martin Muhler, Thomas Lunkenbein, Malte Behrens
Monocrystalline, yet porous mosaic platelets of cobalt ferrite, CoFe2O4, can be synthesized from a layered double hydroxide (LDH) precursor by thermal decomposition. Using an equimolar mixture of Fe2+, Co2+ and Fe3+ during co-precipitation, a mixture of LDH, (FeIICoII)2/3FeIII1/3(OH)2(CO3)1/6  m H2O, and the target spinel CoFe2O4 can be obtained in the precursor. During calcination, the remaining FeII fraction of the LDH is oxidized to FeIII leading to an overall Co2+:Fe3+ ratio of 1:2 as required for spinel crystallization...
June 28, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28657092/spontaneous-polarization-switching-and-piezoelectric-enhancement-of-pvdf-through-strong-hydrogen-bonds-induced-by-layered-double-hydroxides
#12
Rui Tian, Qi Xu, Chao Lu, Xue Duan, Ren-Gen Xiong
The spontaneous dipole alignment of PVDF has been achieved in the formation process of a film through strong hydrogen bonds between PVDF and layered double hydroxides (LDHs), and the as-prepared composite film exhibits excellent energy conversion and storage ability.
June 28, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28654788/highly-selective-and-efficient-removal-of-arsenic-v-chromium-vi-and-selenium-vi-oxyanions-by-layered-double-hydroxide-intercalated-with-zwitterionic-glycine
#13
Hamid Asiabi, Yadollah Yamini, Maryam Shamsayei
In this study, a new strategy for highly selective and extremely efficient removal of toxic oxyanions (Cr(VI), Se(VI), and As(V)) from aqueous solutions using zwitterionic glycine intercalated layered double hydroxide (Gly-LDH) was reported. Hence, to investigate the effect of zwitterionic glycine on the adsorption capacity, selectivity factor and adsorption mechanism of LDHs, two NiAl LDHs intercalated with different inter-layer anions, including NO3(-) and glycine, were synthesized. The obtained results show that the adsorption capacity and selectivity factor of oxyanions through ion exchange mechanism in NO3-LDH is lower than Gly-LDH...
June 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28653842/controlling-the-surface-hydroxyl-concentration-by-thermal-treatment-of-layered-double-hydroxides
#14
Christopher M R Wright, Kanittika Ruengkajorn, Alexander F R Kilpatrick, Jean-Charles Buffet, Dermot O'Hare
Layered double hydroxides (LDHs) are important materials in the field of catalyst supports, and their surface hydroxyl functionality makes them interesting candidates for supporting well-defined single-site catalysts. Here, we report that the surface hydroxyl concentration can be controlled by thermal treatment of these materials under vacuum, leading to hydroxyl numbers (αOH) similar to those of dehydroxylated silica, alumina, and magnesium hydroxide. Thermal treatment of [Mg0.74Al0.26(OH)2](SO4)0.1(CO3)0...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28649797/powder-catalyst-fixation-for-post-electrolysis-structural-characterisation-of-nife-layered-double-hydroxide-based-oxygen-evolution-reaction-electrocatalysts
#15
Corina Andronescu, Stefan Barwe, Edgar Ventosa, Justus Masa, Eugeniu Vasile, Bharathi Konkena, Sandra Möller, Wolfgang Schuhmann
Highly active electrocatalysts for the oxygen evolution reaction are in most cases powder nanomaterials which undergo substantial changes upon applying the high potentials required for high current density oxygen evolution. Due to the vigorous gas evolution the durability under OER conditions is disappointingly low for most powder electrocatalysts due to missing strategies to securely fix powder catalysts to electrode surfaces. Thus, reliable studies of catalysts during or after OER are often impaired. We propose composites of precursors of polybenzoxazines and organophilic modified NiFe layered double hydroxides (LDHs) to form a stable and highly conducting catalyst layer, which allows the study of the catalyst before and after electrocatalysis...
June 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28647589/mannose-conjugated-layered-double-hydroxide-nanocomposite-for-targeted-sirna-delivery-to-enhance-cancer-therapy
#16
Li Li, Run Zhang, Wenyi Gu, Zhi Ping Xu
Sheet-like layered double hydroxide nanoparticles (LDH NPs) have showed great potentials in biomedical applications such as nanocarriers for drug and gene delivery, biosensors and imaging agents. However, target delivery of drugs and genes using LDH NPs to the desired tumor sites is a major challenge in cancer therapy. The aim of this study is to develop a functional LDH-based nanocomposite for target delivery of siRNA to cancer cells. Mannose as a targeting moiety was firstly conjugated onto SiO2-coated LDH nanocomposite...
June 22, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28635272/efficient-flame-retardant-and-smoke-suppression-properties-of-mg-al-layered-double-hydroxide-nanostructures-on-wood-substrate
#17
Bingtuo Guo, Yongzhuang Liu, Qi Zhang, Fengqiang Wang, Qingwen Wang, Yixing Liu, Jian Li, Haipeng Yu
Improving the flame retardancy of wood is an imperative yet highly challenging step in the application of wood in densely populated spaces. In this study, Mg-Al-layered double-hydroxide (LDH) coating was successfully fabricated on a wood substrate to confer flame-retardant and smoke-suppression properties. The chemical compositions and bonding states characterized by energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed the coating constituents of Mg-Al LDH. The coating evenly covered the sample wood surfaces and provided both mechanical enhancement and flame-retardancy effects...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28624617/core-shell-iron-oxide-layered-double-hydroxide-high-electrochemical-sensing-performance-of-h2o2-biomarker-in-live-cancer-cells-with-plasma-therapeutics
#18
Muhammad Asif, Hongwei Liu, Ayesha Aziz, Haitao Wang, Zhengyun Wang, Muhammad Ajmal, Fei Xiao, Hongfang Liu
In this work, we develop a new type of multifunctional core-shell nanomaterial by controllable integration of CuAl layered double hydroxides (LDHs) over the surface of iron oxides (Fe3O4) nanospheres (NSs) to fabricate (Fe3O4@CuAl NSs) hybrid material with interior tunability of LDH phase and explore its practical application in ultrasensitive detection of emerging biomarker, i.e., H2O2 as cancer diagnostic probe. In addition, atmospheric pressure plasmas (APPs) have also been used as potential therapeutic approach for cancer treatment...
June 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28609747/the-enhancement-roles-of-layered-double-hydroxide-on-the-reductive-immobilization-of-selenate-by-nanoscale-zero-valent-iron-macroscopic-and-microscopic-approaches
#19
Baowei Hu, Feng Ye, Chengan Jin, Xiangxian Ma, Chengcai Huang, Guodong Sheng, Jingyuan Ma, Xiangke Wang, Yuying Huang
Herein, we utilized nanoscale zero-valent iron loaded on layered double hydroxide (NZVI/LDH) to immobilize Se(VI) and evaluated the enhancement role of LDH in the NZVI reaction system. The structural characterization indicated that LDH could stabilize and disperse NZVI as well as prevent NZVI from oxidation, thereby increasing iron reactivity. Batch experiments displayed that, compared with those by NZVI, both extent and rate of Se(VI) immobilized by NZVI/LDH significantly increased, owing to the prominent synergistic effect ascribing from adsorption and reduction...
June 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28605712/continuous-hydrothermal-synthesis-of-ca2al-no3-layered-double-hydroxides-the-impact-of-reactor-temperature-pressure-and-naoh-concentration-on-crystal-characteristics
#20
Ian Clark, Peter W Dunne, Rachel L Gomes, Edward Lester
Continuous hydrothermal synthesis (CHS) of nanoparticles is most commonly associated with the production of metal oxides and ceramics. However, recent work has demonstrated that layered double hydroxides (LDH) can also be synthesised via this method. This research investigates how altering temperature, pressure and precursor base concentration affects growth and nucleation rates which impact on LDH characteristics. Experiments examined the separate effects of increased temperature, pressure and NaOH concentration on crystal domain length (CDL) and surface area...
May 27, 2017: Journal of Colloid and Interface Science
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