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https://www.readbyqxmd.com/read/30335209/direct-synthesis-and-pseudomorphic-transformation-of-mixed-metal-oxide-nanostructures-with-non-close-packed-hollow-sphere-arrays
#1
Zhendong Liu, Wenyang Zhao, Prashant Kumar, Xinyu Li, Yasser Al Wahedi, Andre Mkhoyan, Michael Tsapatsis, Andreas Stein
While bottom-up syntheses of ordered nanostructured materials at colloidal length scales have been successful at producing close-packed materials, it is more challenging to synthesize non-close-packed (ncp) structures. Here, a metal oxide nanostructure with ncp hollow sphere arrays was synthesized by combining a polymeric colloidal crystal template (CCT) with a Pechini precursor. The CCT provided defined confinement through its tetrahedral (Td) and octahedral (Oh) voids where the three-dimensionally (3D) ordered, ncp hollow sphere arrays formed as a result of a crystallization-induced rearrangement...
October 18, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30329221/genome-editing-in-streptococcus-mutans-through-self-targeting-crispr-arrays
#2
Tao Gong, Boyu Tang, Xuedong Zhou, Jumei Zeng, Miao Lu, Xiaoxin Guo, Xian Peng, Lei Lei, Bo Gong, Yuqing Li
Streptococcus mutans is the primary aetiological agent of human dental caries. Its major virulence factors, glucosyltransferases (Gtfs), utilize sucrose to synthesize extracellular polysaccharides (EPS), leading to the formation of dental plaque biofilm. The current study was designed to develop a novel self-targeting gene editing technology that targeted gtfs to inhibit biofilms formation. The CRISPR-Cas system (i.e., clustered regularly interspaced short palindromic repeat, with CRISPR-associated proteins) provides sequence-specific protection against foreign genetic materials in archaea and bacteria,and has been widely developed for genomic engineering...
October 17, 2018: Molecular Oral Microbiology
https://www.readbyqxmd.com/read/30328881/a-metal-organic-gel-based-on-fe-iii-and-bi-pyridine-ligand-for-template-synthesis-of-core-shell-composite-polymer-nanowires
#3
Botian Li, Da Xiao, Dongsheng Deng, Haimu Ye, Qiong Zhou, Liming Tang
In this study, a novel self-assembled metal-organic gel was synthesized from ferric nitrate and a di-topic ligand, bis(3-pyridyl)terephthalate. The gel consisted of a three dimensional network of uniform nanofibers. The gelation exhibited high selectivity to Fe(iii) based on metal-ligand coordination. The molar ratio of Fe3+ to ligand had a large influence on the assembly process and the morphology of the gel. The metallogel displayed multi-stimuli responsiveness and excellent heat resistance, thus was further applied as a thermo-stable template for the polymerization of N,N'-methylene bisacrylamide to produce the core/shell polymer composite nanowires...
October 17, 2018: Soft Matter
https://www.readbyqxmd.com/read/30327027/tio%C3%A2-nanotubes-array-on-carbon-cloth-as-a-flexibility-anode-for-sodium-ion-batteries
#4
Xianli Gu, Saisai Wang, Linlin Wang, Chun Wu, Kaibing Xu, Lingyu Zhao, Qi Liu, Mei Ding, Jingli Xu
In this work, three-dimensional (3D) TiO₂ nanotubes (NTs) on carbon cloth (CC) (TiO₂ NTs/CC) were synthesized by a method involving formation of a ZnO@TiO₂ nanorod (NRs) on CC (ZnO@TiO₂ NRs/CC) structure and a subsequent chemical etching process for ZnO NRs template. The 3D TiO₂ NTs/CC were applied as flexible anodes for sodium ion batteries (SIBs). The TiO₂ NTs/CC yielded high specific capacity and good cycling stability, superior to that of some reported TiO₂ nanocomposites. The TiO₂ NTs/CC delivered a reversible capacity of 260 mA·h·g-1 and 85...
January 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30327014/controllable-synthesis-of-hierarchical-rose-like-mnco%C3%A2-o%C3%A2-spinel-as-lithium-ion-anode-materials
#5
Lan Xing, Chengli Tang, Liping Lv, Luxi Tan, Jing Li
Hierarchical rose-like structured MnCo₂O₄ spinel was synthesized via a facile solvothermal process using polyvinyl pyrrolidone (PVP) as the soft template, which was characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), etc. When evaluated as the anode materials for lithium ion batteries, the as-synthesized MnCo₂O₄ spinel exhibited excellent cycling performance and rate capacity. The initial discharge and charge capacity reached 1502 mA·h·g-1 and 1131 mA·h·g-1 at the current density of 100 mA·g-1 , respectively...
January 1, 2019: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/30323585/a-review-of-using-green-chemistry-methods-for-biomaterials-in-tissue-engineering
#6
REVIEW
Hossein Jahangirian, Ensieh Ghasemian Lemraski, Roshanak Rafiee-Moghaddam, Thomas J Webster
Although environmentally safe, or green, technologies have revolutionized other fields (such as consumables, automobiles, etc.), its use in biomaterials is still at its infancy. However, in the few cases in which safe manufacturing technology and materials have been implemented to prevent postpollution and reduce the consumption of synthesized scaffold (such as bone, cartilage, blood cell, nerve, skin, and muscle) has had a significant impact on different applications of tissue engineering. In the present research, we report the use of biological materials as templates for preparing different kinds of tissues and the application of safe green methods in tissue engineering technology...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/30320251/c-3-and-c-4-substituted-bicyclic-coumarin-sulfamates-as-potent-steroid-sulfatase-inhibitors
#7
Dharshini Ganeshapillai, L W Lawrence Woo, Mark P Thomas, Atul Purohit, Barry V L Potter
Synthetic routes to potent bicyclic nonsteroidal sulfamate-based active-site-directed inhibitors of the enzyme steroid sulfatase (STS), an emerging target in the treatment of postmenopausal hormone-dependent diseases, including breast cancer, are described. Sulfamate analogs 9 - 27 and 28 - 46 of the core in vivo active two-ring coumarin template, modified at the 4- and 3-positions, respectively, were synthesized to expand structure-activity relationships. α-Alkylacetoacetates were used to synthesize coumarin sulfamate derivatives with 3-position modifications, and the bicyclic ring of other parent coumarins was primarily constructed via the Pechmann synthesis of hydroxyl coumarins...
September 30, 2018: ACS Omega
https://www.readbyqxmd.com/read/30319790/template-or-ligand-different-structural-behaviours-of-aromatic-amines-in-combination-with-zinco-phosphite-networks
#8
William Holmes, David B Cordes, Alexandra M Z Slawin, William T A Harrison
The solution-mediated syntheses and crystal structures of catena -poly[bis-(2-amino-3-hy-droxy-pyridinium) [zinc-di-μ-phospho-nato] dihydrate], {(C5 H7 N2 O)[Zn(HPO3 )2 ]·2H2 O} n , (I), and poly[(benzene-1,2-di-amine)(μ5 -phospho-nato)zinc], [Zn(HPO3 )(C6 H8 N2 )] n , (II) are described. The extended structure of (I) features [010] anionic chains of vertex-sharing ZnO4 tetra-hedra and HPO3 pseudopyramids; these chains are characterized by disorder over major [occupancy 0.7962 (13)] and minor [0.2038 (13)] components, which can be superimposed on each other by a nominal translational shift...
October 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/30319756/annulative-%C3%AF-extension-of-indoles-and-pyrroles-with-diiodobiaryls-by-pd-catalysis-rapid-synthesis-of-nitrogen-containing-polycyclic-aromatic-compounds
#9
Hiroyuki Kitano, Wataru Matsuoka, Hideto Ito, Kenichiro Itami
A palladium-catalyzed one-step annulative π-extension (APEX) reaction of indoles and pyrroles that allows rapid access to nitrogen-containing polycyclic aromatic compounds is described. In the presence of palladium pivalate and silver carbonate, diverse indoles or pyrroles coupled with diiodobiaryls in a double direct C-H arylation manner to be transformed into the corresponding π-extended compounds in a single step. The newly developed catalytic system enables the use of various pyrroles and indoles as templates with a series of diiodobiaryls to provide structurally complicated and largely π-extended nitrogen-containing polycyclic aromatic compounds that are otherwise difficult to synthesize...
October 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/30318532/electrostatically-regulated-ternary-doped-carbon-foams-with-exposed-active-sites-as-metal-free-oxygen-reduction-electrocatalysts
#10
Md Selim Arif Sher Shah, Jooyoung Lee, Ali Rauf, Jong Hyeok Park, Byungkwon Lim, Pil J Yoo
Pt, a representative electrocatalyst for the oxygen reduction reaction (ORR), has suffered from high cost and poor stability, and thus it is essential to develop alternative electrocatalyst with a high catalytic activity comparable to Pt. Herein, we propose a rationally designed metal-free electrocatalyst with exposed active sites using an N, P, and S ternary-doped and graphene-incorporated porous carbon foam. We developed a novel template-free synthetic approach wherein the electrostatically-mediated complexation of graphene oxide (GO) with 2-aminothiazole (2AT) and branched polyethylenimine (PEI) in the presence of phytic acid (PA) was first induced, followed by a carbonization process to drive the formation of a three-dimensionally interconnected porous carbon foam...
October 15, 2018: Nanoscale
https://www.readbyqxmd.com/read/30316082/molecular-imprinted-s-nitrosothiols-nanoparticles-for-nitric-oxide-control-release-as-cancer-target-chemotherapy
#11
Tuanwei Liu, Zhenyun Qiao, Jilan Wang, Ping Zhang, Zhide Zhang, Dian-Shun Guo, Xinlin Yang
It is the goal for the development of cancer target chemotherapy with specific recognition, efficient killing the tumor cells and tissues to avoid the intolerable side effects. Molecular imprinted polymer (MIPs) nanoparticles could introduce kinds of specific bio-markers (template molecules) into the nanoparticles with the subsequent removal, leaving special holes in the structure with predictable recognition specificity with cells. Herein, we design and synthesize a kind of sialic acid (SA) over-expressed tumor target hollow double-layer imprinted polymer nanoparticles with S-nitrosothiols for nitric oxide (NO)-releasing as chemotherapy...
October 3, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/30315849/insulin-adsorption-onto-zinc-oxide-nanoparticle-mediates-conformational-rearrangement-into-amyloid-prone-structure-with-enhanced-cytotoxic-propensity
#12
Shreyasi Asthana, Zaved Hazarika, Parth Sarathi Nayak, Jyoti Roy, Anupam Nath Jha, Bibekanand Mallick, Suman Jha
BACKGROUND: Injection localized amyloidosis is one of the most prevalent disorders in type II diabetes mellitus (TIIDM) patients relying of insulin injections. Previous studies have reported that nanoparticles can play a role in the amyloidogenic process of proteins. Hence, the present study deals with the effect of zinc oxide nanoparticles (ZnONP) on the amyloidogenicity and cytotoxicity of insulin. METHODS: ZnONP is synthesized and characterized using XRD, Zeta Sizer, UV-Visible spectroscope and TEM...
October 10, 2018: Biochimica et biophysica acta. General subjects
https://www.readbyqxmd.com/read/30308360/highly-enhanced-soot-oxidation-activity-over-3dom-co-3-o-4-ceo-2-catalysts-by-synergistic-promoting-effect
#13
Guangjun Zhai, Jinguo Wang, Zimei Chen, Shuaifeng Yang, Yong Men
Three-dimensionally ordered macroporous (3DOM) Co3 O4 -CeO2 catalysts with controllable Co/Ce molar ratios synthesized by colloidal crystal template method were developed to catalyze the NOx -assisted soot oxidation for the first time, and the obtained 3DOM Co3 O4 -CeO2 catalysts exhibited highly enhanced soot oxidation activity. Detailed characterizations of 3DOM Co3 O4 -CeO2 catalysts revealed that the highly enhanced soot oxidation activity was originated from the synergistic promoting effect by combining the macroporous effect resulted from the unique 3DOM framework, the chemical nature associated with more Co3+ reactive sites, the surface enrichment of Ce species and the improved redox properties...
September 24, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30308085/highly-efficient-synthesis-and-assay-of-protein-imprinted-nanogels-using-magnetic-templates
#14
Rashmi Mahajan, Mona Rouhi, Sudhirkumar Shinde, Thomas Bedwell, Anil Incel, Liliia Mavliutova, Sergey Piletsky, Ian Nicholls, Börje K-E Sellergren
We here report an approach integrating synthesis and a highly sensitive as-say of protein imprinted nanogels ("plastic antibodies") employing templates attached to magnetic carriers. The proteolytic enzymes trypsin and pepsin were immobilized on aminofunctionalized solgel coated magnetic nanoparticles (magNPs). Lightly crosslinked fluorescently doped polyacrylamide nanogels were subsequently produced by high dilution polymerization of monomers in presence of 50 mg of the magNPs. This was followed by multiple washes of the magnetically trapped particles and collection of each fraction...
October 11, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30307018/3d-self-assembled-vs-4-microspheres-with-high-pseudocapacitance-as-highly-efficient-anodes-for-na-ion-batteries
#15
Wenbin Li, Jianfeng Huang, Liangliang Feng, Liyun Cao, Shuwei He
Surface structure plays a decisive role in the surface capacity and electrochemical kinetics of rechargeable batteries. Tuning the surface structure of building blocks has been considered to be a new effective strategy to promote the electrochemical performance of 3D self-assembled nanoarchitectures. Herein, VS4 microspheres assembled from the nano-units with different crystallinities are synthesized via a facile template-free hydrothermal method. The results show that the electrochemical performance of VS4 microspheres as anode materials for sodium-ion batteries (SIBs) largely depends on their crystallinity, and a VS4 electrode with the lowest crystallinity delivers a high reversible capacity of 412 mA h g-1 at 0...
October 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/30307005/ta-doped-porous-tio-2-nanorod-arrays-by-substrate-assisted-synthesis-efficient-photoelectrocatalysts-for-water-oxidation
#16
Shiman He, Yuying Meng, Qili Wu, Jingling Yang, Senchuan Huang, Xiaohui Li, Shengfu Tong, Tewodros Asefa, Mingmei Wu
Owing to its excellent chemical stability and low cost, titanium dioxide (TiO2) has been widely studied as a photoanode for photoelectrochemical (PEC) water splitting. However, TiO2's practical applications in solar energy-to-synthetic fuel conversion processes have been constrained by its inherently poor ability to transport photogenerated electrons and holes. In this paper, we report Ta-doped porous TiO2 nanorod arrays on Ta foil (Ta-PTNA) that do not possess this issue and that can thus efficiently photoelectrocatalyze water oxidation, helping the production of H2 (a clean fuel) from water at the expense of solar light...
October 11, 2018: Nanoscale
https://www.readbyqxmd.com/read/30305592/ultrasensitive-biosensor-for-detection-of-mercury-ii-ions-based-on-dna-cu-nanoclusters-and-exonuclease-iii-assisted-signal-amplification
#17
Hao Zhang, Yanan Guan, Xiaoshuang Li, Lili Lian, Xiyue Wang, Wenxiu Gao, Bo Zhu, Xuying Liu, Dawei Lou
This paper describes a novel method for label-free mercury(II) ion detection based on exonuclease III-induced target signal recycling amplification using double-stranded DNA templated copper nanoclusters. The synthesized DNA-Cu nanoclusters were used with exonuclease III loop amplification technology for ultra-high sensitivity detection of mercury(II) ions, which were detected by significantly decreased fluorescence intensity. Under the optimal experimental conditions, there was a clear linear relationship between Hg2+ concentration in the range of 0...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/30304763/mesoporous-titanium-dioxide-synthesis-and-applications-in-photocatalysis-energy-and-biology
#18
REVIEW
Ben Niu, Xin Wang, Kai Wu, Xianru He, Rui Zhang
Mesoporous materials are materials with high surface area and intrinsic porosity, and therefore have attracted great research interest due to these unique structures. Mesoporous titanium dioxide (TiO₂) is one of the most widely studied mesoporous materials given its special characters and enormous applications. In this article, we highlight the significant work on mesoporous TiO₂ including syntheses and applications, particularly in the field of photocatalysis, energy and biology. Different synthesis methods of mesoporous TiO₂-including sol⁻gel, hydrothermal, solvothermal method, and other template methods-are covered and compared...
October 9, 2018: Materials
https://www.readbyqxmd.com/read/30303632/ultra-small-albumin-templated-gd-ru-composite-nanodots-for-in-vivo-dual-modal-mr-thermal-imaging-guided-photothermal-therapy
#19
Pengping Xu, Huihui Wu, Dongdong Wang, Gaozheng Zhao, Fenfen Li, Bensheng Qiu, Zhen Guo, Qianwang Chen
Multifunctional theranostic nanoagents which realize precise diagnosis and treatment of tumors are attracting increasing interests in recent years. However, efficient and controlled synthesis of ultra-small noble metal nanoagents remains a challenge. Here, monodisperse Gd/Ru@BSA nanodots (GRBNDs) are successfully fabricated via a totally "green", "one-pot" protocol for in situ reduction of Ru(III) and biomineralization of Gd(III) in the presence of albumin. The as-prepared nanoagent possesses the features of being ultra small in size (≈6...
October 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/30303371/three-alumino-galloborate-frameworks-templated-by-organic-amines-syntheses-structures-and-nonlinear-optical-properties
#20
Lin Cheng, Guo-Yu Yang
A series of alumino/galloborates, including (H3 APEA)6 [Al-B5 O10 ]9 ·12H2 O (1, APEA = N, N'-bis(3-aminopropyl)ethylenedi-amine), (HDETA)2 (H2 DETA)2 [AlB5 O10 ]3 (2, DETA = diethylenetriamine), and (H2 EDAP)[GaB5 O10 ]·H2 O (3, EDAP = N-ethyl-diaminopropane), was solvothermally synthesized and characterized in solid-state by powder X-ray diffraction, Fourier transform infrared spectroscopy, UV-vis spectroscopy, and single-crystal X-ray diffraction. All of them feature the [MB5 O10 ] n 2 n- (M = Al or Ga) frameworks, charge-balanced by the long chain-like amine cations...
October 10, 2018: Inorganic Chemistry
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