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layered double hydroxide

Ahmet Nedim Ay, Hande Akar, Adnana Zaulet, Clara Viňas, Francesc Teixidor, Birgul Zumreoglu-Karan
Carborane-intercalated layered double hydroxide nanohybrids (CB-LDH) and a magnesium ferrite (MF) supported-CB-LDH core-shell nanocomposite (CB-LDH@MF) are reported. The preparation of nanohybrids were carried out by exchanging the interlayer nitrate groups of Mg-Al-NO3-LDH with monothiol-o-carborane (SCB), 1-methyl-2-carboxyl-o-carborane (MeCB), 1-phenyl-2-carboxyl-o-carborane (PhCB) and 1,12-dicarboxyl-p-carborane (COOHCB) molecules. A magnetic core-shell nanocomposite was further prepared by supporting the COOHCB-LDH nanohybrid on MF nanoparticles...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Chunsheng Lei, Meng Pi, Panyong Kuang, Yingqing Guo, Fenge Zhang
Hierarchically porous nickel-iron-layered double hydroxide (NiFe-LDH) with a Ni(2+)/Fe(3+) molar ratio of 3 was successfully synthesised through a simple hydrothermal route. After calcination at 400°C, NiFe-LDH transformed into nickel-iron-layered double oxides (NiFe-LDO). The as-prepared samples were characterised through X-ray powder diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and nitrogen adsorption...
February 14, 2017: Journal of Colloid and Interface Science
Xueyi Mei, Qinghua Yan, Peng Lu, Junya Wang, Yuhan Cui, Yu Nie, Ahmad Umar, Qiang Wang
Pt/K2CO3/MgAlOx-reduced graphene oxide (Pt/K/MgAlOx-rGO) hybrids were synthesized, characterized and tested as a promising NOx storage and reduction (NSR) catalyst. Mg-Al layered double hydroxides (LDHs) were grown on rGO via in situ hydrothermal crystallization. The structure and morphology of samples were thoroughly characterized using various techniques. Isothermal NOx adsorption tests indicated that MgAlOx-rGO hybrid exhibited better NOx trapping performance than MgAlOx, from 0.44 to 0.61 mmol · g(-1), which can be attributed to the enhanced particle dispersion and stabilization...
February 16, 2017: Scientific Reports
Jianguo Sun, Yuan Lei, Zhaoxing Dai, Xi Liu, Taomin Huang, Jihong Wu, Zhi Ping Xu, Xinghuai Sun
A novel layered double hydroxide (LDH) nanoparticle/thermogel composite drug delivery system (DDS) for sustained release of brimonidine (Bri) has been designed, prepared and characterized in this study for treatment of severe glaucoma. Brimonidine is first loaded onto LDH (Bri@LDH) nanoparticles, which are then dispersed in the thermogel consisting of plenty of micelles based on poly-(DL-lactic acid co-glycolic acid)-polyethylene glycol-poly-(DL-lactic acid co-glycolic acid) (PLGA-PEG-PLGA) copolymer. The Bri@LDH/Thermogel DDS containing 125...
February 15, 2017: ACS Applied Materials & Interfaces
Muhammad Sajid, Chanbasha Basheer, Muhammad Daud, Abdulnaser Alsharaa
In this work, the potential of layered double hydroxide/graphene (LDH-G) hybrid as a sorbent for extraction and preconcentration of fifteen organochlorine pesticides (OCPs) in urine samples was evaluated. The LDH-G hybrid was synthesized by co-precipitation method and it was then characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The sorbent was then employed in membrane-protected stir-bar supported micro-solid-phase extraction (SB-μ-SPE) of OCPs in urine samples...
February 1, 2017: Journal of Chromatography. A
M A Ahmed, A A Brick, A A Mohamed
A new approach for removal of indigo carmine blue (IC) dye which is extensively used in jeans manufacture was successfully performed on novel mesoporous [LDH] nanoparticles prepared by sol-gel route using CTAB as shape and pore directing agent. The physicochemical features were monitored by X-ray diffraction (XRD), Fourier transformer infra-red (FTIR), N2 adsorption-desorption isotherm, Field emission electron microscope (FESEM) and high resolution transmission electron microscope (HRTEM). The influence of reaction parameters affecting dye adsorption including contact time, initial dye concentration, pH and temperature were investigated...
February 2, 2017: Chemosphere
Yufeng Zhou, Haijiao Zheng, Jiutong Ma, Qiong Jia
In the present study, a novel poly(acrylamide-co-N-isopropylacrylamide-co-ethylene dimethacrylate) monolithic column modified with saline-modified delaminated layered double hydroxides was developed and exploited as the stationary phase in polymer monolith microextraction of β-agonists. Transmission electron microscopy, FTIR spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analysis with derivative thermogravimetric determination were employed to characterize the monoliths...
February 8, 2017: Journal of Separation Science
Cheng-Peng Li, Bo-Lan Liu, Lei Wang, Yue Liu, Jia-Yue Tian, Chun-Sen Liu, Miao Du
To avoid the instability and inefficiency for anion-exchange resins and layered double-hydroxides materials, we present herein a flexible coordination network [Ag(L(243))](NO3)(H2O)(CH3CN) (L(243) = 3-(2-pyridyl)-4-(4-pyridyl)-5-(3-pyridyl)-1,2,4-triazole) with superefficient trapping capacity for permanganate, as a group-7 oxoanion model for radiotoxic pertechnetate pollutant. Furthermore, a high-throughput screening strategy has been developed based on concentration-gradient design principle to ascertain the process and mechanism for anion exchange...
February 16, 2017: ACS Applied Materials & Interfaces
Li Yan, Zhigang Wang, Xianfeng Chen, Xiao-Jun Gou, Zhenyu Zhang, Xiaoyue Zhu, Minhuan Lan, Wei Chen, Guangyu Zhu, Wenjun Zhang
In using nanomaterials for advanced photodynamic therapy, it is important to improve surface modification to increase stability, minimize non-specific loss of drugs in blood circulation, enhance the photostability of photosensitizers, and achieve highly efficient intracellular uptake. In this report, we for the first time covalently conjugate photosensitizer Chlorin e6 (Ce6) to polyethylene glycol modified layered double hydroxides and produce hybrid nanoflakes. These nanoflakes display many superior characteristics and lead to excellent in vivo photodynamic therapeutic efficiency and safety profiles...
February 6, 2017: Chemical Communications: Chem Comm
Gailing Huang, Yingying Sun, Chencong Zhao, Yifei Zhao, Zhaoyuan Song, Junli Chen, Shulan Ma, Junping Du, Zhigang Yin
In this study, water-n-BuOH mixed solvents were used to synthesize the ZnAl-layered double hydroxides (ZnAl-LDHs) via hydrothermal method. The XRD, FT-IR, SEM, ICP and CHN analyses revealed that the type of intercalated anions, the layer Zn/Al ratios, and morphologies of the LDHs depended on the ratio of V(water)/V(n-BuOH) in the mixed solvents. When the ratio of V(water)/V(n-BuOH) is 3 or 0.3, the as-prepared LDHs had 3D "silk flowers" (ZnAl-LDH-3) or "Sedimentary rock" morphology (ZnAl-LDH-0.3). Adsorption properties of dyes on calcined LDHs were studied...
May 15, 2017: Journal of Colloid and Interface Science
Shanyue Guan, Ruizheng Liang, Chunyang Li, Min Wei
Recently, how to design a formulation system with simultaneous diagnosis and therapy toward cancer has attracted tremendous attention. Herein, a supramolecular material was prepared via a facile method by the co-intercalation of folic acid (FA) and doxorubicin (DOX) into the gallery of Gd(3+)-doped layered double hydroxides (LDHs), followed by surface adsorption of fluorescein isothiocyanate (FITC). This supramolecular agent was proved to exhibit excellent magnetic resonance imaging (MRI) and fluorescence imaging (FI) behavior, as well as chemotherapy toward cancer (KB cell)...
April 1, 2017: Talanta
S Sd Elanchezhiyan, Sankaran Meenakshi
The recovery of oil from oil-in-water emulsion has been investigated using chitosan/Magnesium-Aluminium layered double hydroxide hybrid composite (CS-LDHCs) by a single co-precipitation method. Resulting better adsorption efficiency of CS-LDHCs could be observed, indicating the synthesized material was effective to adsorb oil particles from oil-in water emulsion at acidic pH (pH 3) than as-prepared LDH and raw chitosan. The enhancement of adsorption properties by CS-LDHCs material were attributed to the high content of LDH in chitosan, which makes the material more effective towards immobilization of oily particles...
January 23, 2017: International Journal of Biological Macromolecules
Haruko Hase, Toru Nishiuchi, Tsutomu Sato, Tsubasa Otake, Tsuyoshi Yaita, Tohru Kobayashi, Tetsuro Yoneda
Heavy metals contained in wastewater are generally removed by adding antalkaline to increase the pH, and Ni is commonly precipitated as Ni-hydroxides at pH 10. However, a more sustainable remediation method of treatment at neutral conditions would be attractive due to the high cost of chemical reagents and inefficient treatment at present. Based on natural attenuation, the method of adding Al ions has been used in wastewater treatment to precipitate layered double hydroxides (LDH). Here, we investigated the use of Al ion addition in the Ni containing wastewater treatment, experimentally and thermodynamically...
January 17, 2017: Journal of Hazardous Materials
Libo Gao, James Utama Surjadi, Ke Cao, Hongti Zhang, Peifeng Li, Shang Xu, Chenchen Jiang, Jian Song, Dong Sun, Yang Lu
Flexible fiber-shaped supercapacitors (FSSCs) are recently of extensive interest for portable and wearable electronic gadgets. Yet the lack of industrial-scale flexible fibers with high conductivity and capacitance and low cost greatly limits its practical engineering applications. To this end, we here present pristine twisted carbon fibers (CFs) coated with a thin metallic layer via electroless deposition route, which exhibits exceptional conductivity with ∼300% enhancement and superior mechanical strength (∼1...
February 6, 2017: ACS Applied Materials & Interfaces
Maryam Rajabi, Somayeh Arghavani-Beydokhti, Behruz Barfi, Alireza Asghari
In the present work, a novel nanosorbent namely layered double hydroxides with 4-amino-5-hydroxyl-2,7-naphthalendisulfonic acid monosodium salt interlayer anion (Mg-Al-AHNDA-LDH) was synthesized and applied as a dissolvable nanosorbent in a centrifugeless ultrasound-enhanced air-agitated dispersive solid-phase extraction (USE-AA-D-SPE) method. This method was used for the separation and preconcentration of some metal ions including Cd(2+), Cr(6+), Pb(2+), Co(2+), and Ni(2+) prior to their determination using the micro-sampling flame atomic absorption spectrometry (MS-FAAS) technique...
March 8, 2017: Analytica Chimica Acta
Weijun Peng, Hongqiang Li, Shaoxian Song
CoAl-layered double hydroxide/fluorinated graphene (CoAl-LDH/FGN) composites were fabricated via a two-step hydrothermal method. The synthesized CoAl-LDH/FGN composites have been characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and electrochemical measurements. The results indicated that the fluorinated carbon with various configuration forms were grafted onto the framework of graphene, and the C-F bond configuration and fluorine content could be tuned by the fluorination time...
February 1, 2017: ACS Applied Materials & Interfaces
Marko Pavlovic, Paul Rouster, Elodie Bourgeat-Lami, Vanessa Prevot, Istvan Szilagyi
Colloidal stability of polymeric latex particles was studied in the presence of oppositely charged layered double hydroxide (LDH) platelets of different interlayer anions. Adsorption of the LDH particles led to charge neutralization and to overcharging of the latex at appropriate concentrations. Mixing stable colloidal suspensions of individual particles results in rapid aggregation once the LDH adsorption neutralizes the negative charges of the polymer spheres, while stable suspensions were observed at high and low LDH doses...
January 12, 2017: Soft Matter
Neena Mitter, Elizabeth A Worrall, Karl E Robinson, Peng Li, Ritesh G Jain, Christelle Taochy, Stephen J Fletcher, Bernard J Carroll, G Q Max Lu, Zhi Ping Xu
Topical application of pathogen-specific double-stranded RNA (dsRNA) for virus resistance in plants represents an attractive alternative to transgenic RNA interference (RNAi). However, the instability of naked dsRNA sprayed on plants has been a major challenge towards its practical application. We demonstrate that dsRNA can be loaded on designer, non-toxic, degradable, layered double hydroxide (LDH) clay nanosheets. Once loaded on LDH, the dsRNA does not wash off, shows sustained release and can be detected on sprayed leaves even 30 days after application...
January 9, 2017: Nature Plants
Tuyen Nguyen, Michel Boudard, M João Carmezim, M Fátima Montemor
Consecutive layers of Ni(OH)2 and Co(OH)2 were electrodeposited on stainless steel current collectors for preparing charge storage electrodes of high specific capacity with potential application in hybrid supercapacitors. Different electrodes were prepared consisting on films of Ni(OH)2, Co(OH)2, Ni1/2Co1/2(OH)2 and layered films of Ni(OH)2 on Co(OH)2 and Co(OH)2 on Ni(OH)2 to highlight the advantages of the new architecture. The microscopy studies revealed the formation of nanosheets in the Co(OH)2 films and of particles agglomerates in the Ni(OH)2 films...
January 4, 2017: Scientific Reports
Sayantan Ray, Suman Saha, Biswanath Sa, Jui Chakraborty
Considering the existing drawbacks of methotrexate (MTX) with respect to its solubility and toxicity, we incorporated it in a nanoceramic matrix, Mg-Al-layered double hydroxide (LDH) to form LDH-MTX nanoparticles, and the same was in turn encapsulated in a nontoxic and biodegradable polymer, poly (D,L-lactide-co-glycolide) (PLGA), to arrest the initial burst release and dose-dumping-related toxicity, already reported by our group. Our present study was designed to evaluate the pharmacokinetics, tissue distribution, survival rate of the test animals, and antitumor efficacy of the PLGA-LDH-MTX nanoparticles and its counterpart without LDH, PLGA-MTX nanoparticles compared with bare MTX...
January 3, 2017: Drug Delivery and Translational Research
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