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layered double hydroxide

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 21, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
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...
June 21, 2017: ACS Applied Materials & Interfaces
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
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
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
G Starukh
Calcined and organo-modified Zn-Al layered double hydroxides (LDHs) were studied as adsorbents and photocatalysts for removal of cationic dye, as namely methylene blue (MB). Zn-Al LDHs with a cationic ratio of 2:4 were obtained by the coprecipitation method. As-synthesized samples were calcined at different temperatures and the phase transformations were investigated by XRD, TG/DTG, and UV-vis-DR methods. The activity of as-synthesized and calcined Zn-Al LDHs under UV light was attributed to the presence of ZnO phase...
December 2017: Nanoscale Research Letters
Keqing Zhou, Rui Gao, Xiaodong Qian
In present study, LDH/MoS2 hybrids were facilely prepared by self-assembly of exfoliated MoS2 nanosheets and LDH via electrostatic force. The structure and morphology of the LDH/MoS2 hybrids were characterized and then introduced into epoxy for reducing its fire hazards. Compared with single MoS2, LDH/MoS2 hybrids showed a more homogeneous dispersion in the epoxy matrix and no obvious agglomerates were observed. Compared with MoS2, the addition of LDH/MoS2 hybrids endowed more excellent fire resistance to epoxy matrix, which was reflected by the significantly reduced peak heat release rate, total heat release and total smoke production...
May 27, 2017: Journal of Hazardous Materials
Haiping Li, Thanh-Nhan Tran, Byong-Jun Lee, Chunfei Zhang, Jong-Deok Park, Tong-Hyun Kang, Jong-Sung Yu
Despite extensive study on single-layer layered double hydroxides (SL-LDHs) with NO3(-) counterions, SL-LDHs with CO3(2-) counterions (CO3(2-) SL-LDHs) have never been prepared before. Herein, a CoAl-CO3(2-) SL-LDH which stays stable in water and powdery state is first synthesized using ethylene glycol as a reaction medium. The SL-LDH, with thickness of ∼0.85 nm, is composed of one Co(Al)O6 layer sandwiched between two CO3(2-) layers. The SL-LDH powder shows high specific surface area (∼289 m(2)/g) and excellent electrocatalytic oxygen evolution efficiency...
June 21, 2017: ACS Applied Materials & Interfaces
Rong Liu, Yanyong Wang, Dongdong Liu, Yuqin Zou, Shuangyin Wang
An earth-abundant and highly efficient electrocatalyst is essential for oxygen evolution reaction (OER) due to its poor kinetics. Layered double hydroxide (LDH)-based nanomaterials are considered as promising electrocatalysts for OER. However, the stacking structure of LDHs limits the exposure of the active sites. Therefore, the exfoliation is necessary to expose more active sites. In addition, the defect engineering is proved to be an efficient strategy to enhance the performance of OER electrocatalysts. For the first time, this study prepares ultrathin CoFe LDHs nanosheets with multivacancies as OER electrocatalysts by water-plasma-enabled exfoliation...
June 7, 2017: Advanced Materials
Jingchun Yan, Yun Chen, Linbo Qian, Weiguo Gao, Da Ouyang, Mengfang Chen
CuMgFe layered double hydroxide (CuMgFe-LDH) was successfully synthesized and characterized as an efficient catalyst of persulfate (PS) for the degradation of ethylbenzene. Under the conditions of 0.2gL(-1) CuMgFe-LDH and 4.0mmolL(-1) persulfate at pH 7.6, the degradation efficiency of 0.08mmolL(-1) ethylbenzene was 93.7% with TOC removal efficiency of 65.2% in 24h, and the concentration of Cu leached into the solution was as low as 0.095mgL(-1) after the reaction. The reuse of CuMgFe-LDH showed that the catalyst was highly stable after 5 recycles...
May 8, 2017: Journal of Hazardous Materials
Bei Li, Zi Gu, Nyoman Kurniawan, Weiyu Chen, Zhi Ping Xu
Recently, Mn(II)-containing nanoparticles have been explored widely as an attractive alternative to Gd(III)-based T1 -weighted magnetic resonance imaging (MRI) contrast agents (CAs) for cancer diagnosis. However, as far as it is known, no Mn-based MRI CAs have been reported to sensitively respond to a very weakly acidic environment (pH 6.5-7.0, i.e., the pH range in a tumor microenvironment) with satisfactory imaging performance. Here, recently devised pH-ultrasensitive Mn-based layered double hydroxide (Mn-LDH) nanoparticles with superb longitudinal relaxivity (9...
June 6, 2017: Advanced Materials
Dirk Schmelter, Arthur Langry, Andrej Koenig, Patrick Keil, Fabrice Leroux, Horst Hintze-Bruening
For many decorative applications like industrial and architectural paints, prevention of metal substrates from corrosion is a primary function of organic coatings. Triggered release of inhibitor species is generally accepted as a remedy for starting corrosion in case of coatings damage. A polyurethane based coating, doped with bola-amphiphiles of varying molecular weight but with a common head group motif that stems from ring-opened alkenyl succinic anhydride, enables passivation of the defect and mitigates cathodic delamination, if applied on cold rolled steel...
June 5, 2017: Scientific Reports
Yingli Yang, Xinlong Yan, Xiaoyan Hu, Rui Feng, Min Zhou
In-situ growth of Zeolite imidazolate frameworks (ZIFs) on layered double hydroxides (LDHs) to form porous composites is a promising and challenging strategy to develop materials for separation application. Herein, the Zn-Al LDH with different Zn/Al molar ratios was prepared and used as matrix for the growth of ZIF-8 on its surface. The resulting composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 physisorption, thermogravimetric (TG), scanning electron microscope (SEM) and elemental analysis followed by testing for As(V) removal from aqueous solution...
May 26, 2017: Journal of Colloid and Interface Science
Jiao Zhao, Qiang Huang, Meiying Liu, Yanfeng Dai, Junyu Chen, Hongye Huang, Yuanqing Wen, Xiaoli Zhu, Xiaoyong Zhang, Yen Wei
In this paper, a novel strategy for the preparation of poly(levodopa) functionalized MgAl-layered double hydroxide (PDOPA-f-LDH) was developed based on the modified mussel inspired chemistry. The utilization of PDOPA-f-LDH for the removal of methylene blue (MB) from aqueous solution was also examined. Taken advantage of the self-polymerization of levodopa (DOPA) in alkaline solution and the strong affinity of catechol groups to the substrate surface, the LDH was covered homogeneously by a layer of polymer coating of DOPA, leading to the functionalization toward LDH...
May 26, 2017: Journal of Colloid and Interface Science
Yan Li, Hao-Yu Bi, Hui Li, Xiao-Ming Mao, Ya-Qin Liang
A novel magnetic nanocomposite with enrofloxacin (ENR) intercalated MgAl layered double hydroxides (LDH) coated on Fe3O4 particles, denoted as Fe3O4@(ENR-LDH), was assembled via a delamination-reassembling process. Fe3O4@(ENR-LDH) was characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, element chemical analysis, transmission electron microscopy, differential scanning calorimetry, and room-temperature magnetic measurements. Results showed the following: ① Fe3O4@(ENR-LDH) consisted of both ENR-LDH nanocrystallite and Fe3O4 phases; ② Fe3O4@(ENR-LDH) presented well-defined core-shell structure with diameter in the range of 15-20nm; ③ the thermal stability of ENR was enhanced after intercalation; and ④ Fe3O4@(ENR-LDH) exhibited good superparamagnetism...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Huali Zuo, Weiyu Chen, Helen M Cooper, Zhi Ping Xu
Active targeting of nanoparticles (NPs) for cancer treatment has attracted increasing interest in the past decades. Various ligand modification strategies have been used to enhance the targeting of NPs to the tumor site. However, how to reproducibly fabricate diverse targeting NPs with narrowly changeable biophysiochemical properties remains as a major challenge. In this study, layered double hydroxide (LDH) NPs were modified as a target delivery system. Two brain tumor targeting ligands, i.e., angiopep-2 and rabies virus glycoprotein, were conjugated to the LDH NPs via an intermatrix protein moiety, bovine serum albumin (BSA), simultaneously endowing the LDHs with excellent colloidal stability and targeting capability...
June 21, 2017: ACS Applied Materials & Interfaces
Wenjun Liu, Jian Bao, Meili Guan, Yan Zhao, Jiabiao Lian, Jingxia Qiu, Li Xu, Yunpeng Huang, Jing Qian, Huaming Li
Bifunctional electrocatalysts, which are active both for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), can increase the efficiency of overall water splitting, which is considered an attractive technology for hydrogen production. In this study, we report NiCo-LDH ultrathin nanosheets grown on nickel foam as a bifunctional electrocatalyst for overall water splitting. When used as OER and HER electrodes, NiCo-LDH/NF demonstrated excellent water splitting performance, achieving a current density of 10 mA cm(-2) at 1...
May 31, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Zaineb Bouaziz, Laurence Soussan, Jean-Marc Janot, Mathilde Lepoitevin, Mikhael Bechelany, Mohamed Amine Djebbi, Abdesslem Ben Haj Amara, Sebastien Balme
Lysozyme from hen egg white is composed by a unique linear chain of 129 amino acids. It is known to inhibit Gram positive bacteria and to form amyloid fibrils at low pH, under 75°C. This work investigates the effect of the fibrillation and/or adsorption onto a layered double hydroxide material on the antibacterial properties of lysozyme. The kinetics of adsorption follows a behavior of pseudo second order model. The X-ray diffraction and the Fourier transform infrared spectroscopy highlight that adsorption occurs only on the external surface of the material...
May 20, 2017: Colloids and Surfaces. B, Biointerfaces
Rumin Li, Rong Che, Qi Liu, Shouzheng Su, Zhanshuang Li, Hongsen Zhang, Jingyuan Liu, Lianhe Liu, Jun Wang
Under the background of increasing and sustainable development of nuclear industry, it is significant to develop materials with high adsorption capacity and high selectivity of uranium as adsorbents. In this work, novel Mg-Co layered-double-hydroxide (LDH) with hierarchical structure was synthesized successfully via self-sacrifice template by ZIF-67. X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller surface area measurement (BET) and X-ray photoelectron spectroscopy (XPS) characterization were conducted, which confirmed the specifically hollow structured material possesses high surface area and abundant mesopores that makes uranium ions diffuse into it more easily...
May 6, 2017: Journal of Hazardous Materials
Liting Ju, Pingxiao Wu, Xiaolin Lai, Shanshan Yang, Beini Gong, Meiqing Chen, Nengwu Zhu
In this study, ZnAlTi layered double hydroxide (ZnAlTi-LDH) combined with fullerene (C60) was fabricated by the urea method, and calcined under vacuum atmosphere to obtain nanocomposites of C60-modified ZnAlTi layered double oxide (ZnAlTi-LDO). The morphology, structure and composition of the nanocomposites were analyzed by Scanning Electron Microscopy, High-resolution transmission electron microscopy, X-ray diffraction patterns, Fourier transform infrared and specific surface area. The UV-vis diffuse reflectance spectra indicated that the incorporation of C60 expanded the absorption of ZnAlTi-LDO to visible-light region...
May 23, 2017: Environmental Pollution
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