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https://read.qxmd.com/read/30762036/co-3-o-4-nanoparticle-entrapped-nitrogen-and-boron-codoped-mesoporous-carbon-as-an-efficient-electrocatalyst-for-hydrogen-evolution
#1
Duihai Tang, Xue Sun, Huan Yu, Wenting Zhang, Ling Zhang, Xuefeng Li, Zhen-An Qiao, Junjiang Zhu, Zhen Zhao
Co3O4-nanoparticle-entrapped nitrogen and boron codoped mesoporous carbon was synthesized via the molten salt method. Melamine formaldehyde resin (MF resin) was used as the nitrogen and carbon precursor, and boric acid was utilized as the boron precursor. Furthermore, cobalt chloride was used as the cobalt precursor and the template for the formation of mesopores, which could also be removed and partly recovered by acid washing. The characterization results revealed that the as-obtained samples possessed mesoporous structures, with high cobalt, boron, and nitrogen content values...
February 14, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30758024/recyclable-magnetic-nife-2-o-4-c-yolk-shell-nanospheres-with-excellent-visible-light-fenton-degradation-performance-of-tetracycline-hydrochloride
#2
Zhe Chen, Yuting Gao, Dongzhao Mu, Hongfei Shi, Dawei Lou, Shu-Yuan Liu
A photo-Fenton-like reaction was considered as an effective method for wastewater treatment because it could produce more oxidative species such as hydroxyl radicals (˙OH) to accelerate the reaction. In this paper, a NiFe2O4/C (abbr. as NFO/C) yolk-shell nanostructure was synthesized via one-step calcination using polyacrylic acid sodium salt (PAAS) NPs as a template. The nanocomposite was characterized using X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption, among others...
February 13, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30755527/additive-manufacturing-of-patterned-2d-semiconductor-through-recyclable-masked-growth
#3
Yunfan Guo, Pin-Chun Shen, Cong Su, Ang-Yu Lu, Marek Hempel, Yimo Han, Qingqing Ji, Yuxuan Lin, Enzheng Shi, Elaine McVay, Letian Dou, David A Muller, Tomás Palacios, Ju Li, Xi Ling, Jing Kong
The 2D van der Waals crystals have shown great promise as potential future electronic materials due to their atomically thin and smooth nature, highly tailorable electronic structure, and mass production compatibility through chemical synthesis. Electronic devices, such as field effect transistors (FETs), from these materials require patterning and fabrication into desired structures. Specifically, the scale up and future development of "2D"-based electronics will inevitably require large numbers of fabrication steps in the patterning of 2D semiconductors, such as transition metal dichalcogenides (TMDs)...
February 12, 2019: Proceedings of the National Academy of Sciences of the United States of America
https://read.qxmd.com/read/30754714/preparation-and-characterization-of-biomimetic-hydroxyapatite-nanocrystals-by-using-partially-hydrolyzed-keratin-as-template-agent
#4
Chunxia Gao, Ke Zhao, Liwei Lin, Jinyu Wang, Yang Liu, Peizhi Zhu
Hydroxyapatite (HA), a typical inorganic component of bone, is a widely utilized biomaterial for bone tissue repair and regeneration due to its excellent properties. Inspired by the recent findings on the important roles of protein in biomineralization and natural structure of fish scales, keratin was chosen as a template for modulating the assembly of HA nanocrystals. A series of HA nanocrystals with different sizes were synthesized by adjusting the concentration of partially hydrolyzed keratin. The structure and compositions of the prepared HA were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Raman spectrum, and Transmission electron microscopy (TEM)...
February 11, 2019: Nanomaterials
https://read.qxmd.com/read/30746103/topological-self-template-directed-synthesis-of-multi-shelled-intermetallic-ni-3-ga-hollow-microspheres-for-the-selective-hydrogenation-of-alkyne
#5
Mingzhen Hu, Wenjuan Yang, Shoujie Liu, Wei Zhu, Yang Li, Botao Hu, Zheng Chen, Rongan Shen, Weng-Chon Cheong, Yu Wang, Kebin Zhou, Qing Peng, Chen Chen, Yadong Li
Multi-shelled hollow structured materials featuring large void volumes and high specific surface areas are very promising for a variety of applications. However, controllable synthesis of multi-shelled hollow structured intermetallic compounds remains a formidable challenge due to the high annealing temperature commonly required for the formation of intermetallic phases. Here, a topological self-template strategy was developed to solve this problem. Using this strategy, we prepared well-defined multi-shelled intermetallic Ni3 Ga hollow microspheres (Ni3 Ga-MIHMs) as disclosed by the HAADF-STEM, HRTEM, and EDS characterizations, and the BET specific surface areas of them measured as much as 153...
January 14, 2019: Chemical Science
https://read.qxmd.com/read/30744753/nanostructured-ni-ceo%C3%A2-zro%C3%A2-catalysts-for-co%C3%A2-conversion-into-synthetic-natural-gas
#6
Luciano Atzori, Elisabetta Rombi, Daniela Meloni, Roberto Monaci, Maria Franca Sini, Maria Giorgia Cutrufello
NiO-CeO₂-ZrO₂ mixed oxides, with Ni/(Ce + Zr) = 1 mol/mol and different Ce/Zr molar ratios, were prepared by the soft-template method. The chemical composition, texture, structure, and redox features of the synthesized systems were investigated by different techniques. All samples were nanocrystalline (NiO nanocrystal average size 4 nm) and had high surface area and quite an ordered mesoporous system. The catalytic performances in the CO₂ conversion into methane were studied at atmospheric pressure, 300 °C, and stoichiometric H₂/CO₂ molar ratio...
June 1, 2019: Journal of Nanoscience and Nanotechnology
https://read.qxmd.com/read/30741545/discovery-of-polypharmacological-melanocortin-3-and-4-receptor-probes-and-identification-of-a-100-fold-selective-nm-mc3r-agonist-versus-a-%C3%A2%C2%B5m-mc4r-partial-agonist
#7
Katlyn A Fleming, Katie T Freeman, Mike D Powers, Radleigh G Santos, Ginamarie Debevec, Marc A Giulianotti, Richard A Houghten, Skye R Doering, Clemencia Pinilla, Carrie Haskell-Luevano
The centrally expressed melanocortin-3 and melanocortin-4 receptors (MC3R, MC4R) are established targets to treat diseases of positive and negative energy homeostasis. We previously reported (J. Med. Chem. 60:4342 2017) mixture-based positional scanning approaches to identify dual MC3R agonist and MC4R antagonist tetrapeptides. Herein, 46 tetrapeptides were chosen for MC3R agonist screening selectivity profiles, synthesized, and pharmacologically characterized at the mouse melanocortin-1, -3, -4, and -5 receptors...
February 11, 2019: Journal of Medicinal Chemistry
https://read.qxmd.com/read/30739881/amido-surface-functionalized-magnetic-molecularly-imprinted-polymers-for-the-efficient-extraction-of-sibiskoside-from-sibiraea-angustata
#8
YuLan Liang, QianYu Zhao, HongDong Liu, XiaoTian Chen, DongMing Zhang, XueWen Lai, Bin Li, Xin Yang
A general method for efficient and selective extraction of a target compound from complex natural products remains elusive, despite decades of research. By introducing a functional amido group on the surface of dispersity-enhanced magnetic nanoparticles, a nanoparticle receptor to selectively recognize Sibiskoside (a monoterpene) from the aerial portion of Sibiraea angustata by hydrogen bond interaction was synthesized. The superparamagnetic Fe3 O4 nanoparticles were successively modified with tetraethyl orthosilicate (TEOS), amino and amido functional groups, and 4-vinylbenzoic acid (VBZA) was used as the functional monomer...
January 18, 2019: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://read.qxmd.com/read/30739328/crispr-cas9-d10a-nickase-assisted-base-editing-in-solvent-producer-clostridium-beijerinckii
#9
Qi Li, François M Seys, Nigel P Minton, Junjie Yang, Yu Jiang, Weihong Jiang, Sheng Yang
Clostridium beijerinckii is a potentially important industrial microorganism as it can synthesize valuable chemicals and fuels from various carbon sources. The establishment of convenient to use, effective gene tools with which the organism can be rapidly modified is essential if its full potential is to be realized. Here, we developed a genomic editing tool (pCBEclos) for use in C. beijerinckii based on the fusion of cytidine deaminase (Apobec1), Cas9D10A nickase and uracil DNA glycosylase inhibitor (UGI)...
February 10, 2019: Biotechnology and Bioengineering
https://read.qxmd.com/read/30739029/electrochemical-detection-of-toxic-anti-scald-agent-diphenylamine-using-oxidized-carbon-nanofiber-encapsulated-titanium-carbide-electrocatalyst
#10
Settu Ramki, Ramaraj Sukanya, Shen-Ming Chen, Mani Sakthivel, Yi-Ting Ye
Two dimensional (2D) titanium carbide (Ti-C) is an analogues of graphene have tremendous attention in recent years due to their high electrical conductivity and catalytic activity. Herein, we have synthesized Ti-C micro particles based on the template-assisted method and subsequently integrated with oxidized carbon nanofiber (f-CNF) through ultrasonication technique. The prepared Ti-C/f-CNF composite was subjected to various structural and morphological characterization techniques including the X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS)...
February 1, 2019: Journal of Hazardous Materials
https://read.qxmd.com/read/30735343/hollow-microspherical-and-microtubular-3-3-carbazole-based-covalent-organic-frameworks-and-their-gas-and-energy-storage-applications
#11
Ahmed F M El-Mahdy, Christine Young, Jeonghun Kim, Jungmok You, Yusuke Yamauchi, Shiao-Wei Kuo
Covalent organic frameworks (COFs) are a family of crystalline porous networks having applications in various fields, including gas and energy storage. Despite respectable progress in the synthesis of such crystalline materials, examples of the use of template-free methods to construct COFs having hollow nano- and microstructures are rare. Furthermore, all reported methods for synthesizing these hollow structural COFs have involved [4+2] and [3+2] condensations. Herein, we report the synthesis of hollow microspherical and microtubular carbazole-based COFs through template-free, one-pot, [3+3] condensations of the novel triamine 9-(4-aminophenyl)-carbazole-3,6-diamine (Car-3NH2) and triformyl linkers with various degrees of planarity...
February 8, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30734395/design-synthesis-and-bioactivities-of-tasiamide-b-derivatives-as-cathepsin-d-inhibitors
#12
Zhi Li, Keting Bao, Hao Xu, Ping Wu, Wei Li, Jian Liu, Wei Zhang
Cathepsin D (Cath D) is overexpressed and hypersecreted by malignant tumors and involved in the progress of tumor invasion, proliferation, metastasis, and apoptosis. Cath D has been considered as a potential target to treat cancer. Our previous studies revealed that tasiamide B derivatives TB-9 and TB-11 exhibited high potent inhibition against Cath D and other aspartic proteases, but their molecular weights are still high, and the role of each residue is unknown yet. Based on this, two series of tasiamide B derivatives have been designed, synthesized, and evaluated for their inhibitory activity against Cath D/Cath E/BACE1...
February 7, 2019: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://read.qxmd.com/read/30724952/polyethyleneimine-assisted-one-pot-synthesis-of-quasi-fractal-plasmonic-gold-nanocomposites-as-a-photothermal-theranostic-agent
#13
Vladimir Mulens-Arias, Alba Nicolás-Boluda, Alexandre Gehanno, Alice Balfourier, Florent Carn, Florence Gazeau
Gold nanoparticles have been thoroughly used in designing thermal ablative therapies and in photoacoustic imaging in cancer treatment owing to their unique and tunable plasmonic properties. While the plasmonic properties highly depend on the size and structure, controllable aggregation of gold nanoparticles can trigger a plasmonic coupling of adjacent electronic clouds, henceforth leading to an increase of light absorption within the near-infrared (NIR) window. Polymer-engraftment of gold nanoparticles has been investigated to achieve the plasmonic coupling phenomenon, but complex chemical steps are often needed to accomplish a biomedically relevant product...
February 6, 2019: Nanoscale
https://read.qxmd.com/read/30724925/anion-mediated-bio-relevant-catalytic-activity-of-dinuclear-nickel-ii-complexes-derived-from-an-end-off-compartmental-ligand
#14
Tonmoy Chakraborty, Somali Mukherjee, Sanchari Dasgupta, Biplab Biswas, Debasis Das
Four dinuclear nickel(ii) complexes, namely [Ni4(L)2(H2O)8(μ2-H2O)2](NO3)6(H2O)6 (1), [Ni2(L)Cl2(μ-Cl)(CH3OH)] (2), [Ni2(L)(OAc)2(H2O)2]Br (3) and [Ni2(L)(H2O)4(μ2-OH)] (H2O)X(I)X (4), have been synthesized using a template synthesis technique by adding nickel(ii) salts (nitrate/chloride/bromide/iodide) to the N4O donor end-off compartmental ligand (HL) obtained via the condensation of 2-(2-pyridyl)ethylamine and 2,6-diformyl-4-isopropyl phenol in methanol. All complexes were characterized with the help of typical physicochemical techniques, and their solid-state structures were assigned from single crystal X-ray analysis...
February 6, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/30723971/detection-of-oxytocin-atrial-natriuretic-peptide-and-brain-natriuretic-peptide-using-novel-imprinted-polymers-produced-with-amphiphilic-monomers
#15
Chung-Yin Lin, Sheng-Hung Tsai, Dar-Fu Tai
The cystine-bridged cyclic peptide hormones (CBCPHs) represent signature structural feature as well as unique biological activity. In this study, three CBCPHs have been identified and characterized, namely, oxytocin, atrial natriuretic peptides (ANPs), and brain natriuretic peptides (BNPs). Because research has shown that ANPs and BNPs are powerful diagnostic biomarkers for heart disease, a highly laudable endeavor would be to develop a novel sensor for detecting ANP or BNP levels. Therefore, an amphiphilic monomer Acr-His-NHNH-Fmoc was synthesized to form molecularly imprinted polymers (MIPs) for targeted CBCPH detection...
February 5, 2019: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://read.qxmd.com/read/30720824/a-nano-reactor-based-on-ptni-metal-organic-framework-composites-loaded-with-polyoxometalates-for-hydrogenation-esterification-tandem-reactions
#16
Luning Chen, Xibo Zhang, Jinhong Zhou, Zhaoxiong Xie, Qin Kuang, Lansun Zheng
Tandem catalysis (i.e., a process in which a desirable product is synthesized by a one-step process consisting of sequential reactions) has attracted intensive attention owing to its sustainable green and atom-economical characteristics. In this process, the utilization of a high-efficiency multifunctional catalyst is key. However, different functional sites integrated within the catalyst are required to be rationally designed and precisely engineered to guarantee the synergy between the catalytic reactions...
February 5, 2019: Nanoscale
https://read.qxmd.com/read/30717529/-cloning-and-expression-analysis-in-resurrection-process-of-trehalose-6-phosphate-synthase-gene-from-selaginella-tamariscina
#17
Cai-Cai Xi, Wei Gu, Hong-Mei Sun, Rong Tian, Qi Liu, Xiao-Hao Wang
Selaginella tamariscina is a typical resuscitation medicinal plant with extreme drought tolerance. Trehalose plays an important role in the resurrection process, and the trehalose-6-phosphate synthase(TPS) is the key enzyme to synthesize trehalose in plants. In this study, the sequence of TPS was obtained by splicing from the transcriptome data of S. tamariscina. After the synthesis of cDNA based on the template of total RNA, the sequence was cloned by RT-PCR for verification and then analyzed by bioinformatics methods...
December 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://read.qxmd.com/read/30716066/low-cost-cross-taxon-enrichment-of-mitochondrial-dna-using-in-house-synthesised-rna-probes
#18
Stephen M Richards, Nelli Hovhannisyan, Matthew Gilliham, Joshua Ingram, Birgitte Skadhauge, Holly Heiniger, Bastien Llamas, Kieren J Mitchell, Julie Meachen, Geoffrey B Fincher, Jeremy J Austin, Alan Cooper
Hybridization capture with in-solution oligonucleotide probes has quickly become the preferred method for enriching specific DNA loci from degraded or ancient samples prior to high-throughput sequencing (HTS). Several companies synthesize sets of probes for in-solution hybridization capture, but these commercial reagents are usually expensive. Methods for economical in-house probe synthesis have been described, but they do not directly address one of the major advantages of commercially synthesised probes: that probe sequences matching many species can be synthesised in parallel and pooled...
2019: PloS One
https://read.qxmd.com/read/30714725/solution-grown-single-unit-cell-quantum-wires-affording-self-powered-solar-blind-uv-photodetectors-with-ultrahigh-selectivity-and-sensitivity
#19
Dong Li, Simeng Hao, Guanjie Xing, Yunchao Li, Xiaohong Li, Louzhen Fan, Shihe Yang
As crystalline semiconductor nanowires are thinned down to a single-unit-cell thickness, many fascinating properties could arise pointing to promising applications in various fields. A grand challenge is to be able to controllably synthesize such ultrathin nanowires. Herein we report a strategy, which synergizes soft template with oriented attachment (ST-OA), to prepare high-quality single-unit-cell semiconductor nanowires (SSNWs). Using this protocol, we are able to synthesize for the first time ZnS and ZnSe nanowires (NWs) with only a single-unit-cell thickness (less than 1...
February 4, 2019: Journal of the American Chemical Society
https://read.qxmd.com/read/30714724/hollow-multi-shelled-structures-of-co-3-o-4-dodecahedron-with-unique-crystal-orientation-for-enhanced-photocatalytic-co-2-reduction
#20
Li Wang, Jiawei Wan, Yasong Zhao, Nailiang Yang, Dan Wang
Structure and facet control are always considered as the effective routes to enhance the catalytic performance. We successfully synthesized the hollow multi-shelled structures (HoMSs) of Co3 O4 dodecahedron by adopting the metal-organic frameworks (MOFs) as templates with sequential templating approach (STA). Importantly, owing to the topologic arrangement of metal atoms in MOFs, the Co3 O4 nanocrystals in HoMSs are assembled oriented, forming a unique shell with (111) facets exposure. This process is defined as "genetic inheritance" in this work...
February 4, 2019: Journal of the American Chemical Society
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