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Marzieh Kajbafvala, Mansoor Farbod
Although liquid phase exfoliation is a powerful method to produce MoS2 nanosheets in large scale, but its effectiveness is limited by the diversity of produced nanosheets sizes. Here a novel approach for separation of MoS2 flakes having various lateral sizes and thicknesses based on the cascaded centrifugation has been introduced. This method involves a pre-separation step which is performed through low-speed centrifugation to avoid the deposition of large area single and few-layers by the heavier particles...
May 14, 2018: Journal of Colloid and Interface Science
Yibei Wan, Xiao Liu, Penglei Liu, Lei Zhao, Weihua Zou
Polydopamine microspheres (PDMPs) synthesized by a facile solution oxidation method were adopted as a potential adsorbent for the removal of Norfloxacin (NOR) from aqueous solution. The morphologies and properties of PDMPs were characterized using TEM, SEM, FTIR and pHPZC . Parameters effects such as contact time, initial pH, initial concentration and ionic strength on the adsorption capacity of NOR onto PDMPs were studied. To maximize NOR removal from liquid phase, Box-Behnken experimental design (BBD) combined with response surface modeling (RSM) was employed based on the 17 preliminary experiments at 308 K...
May 21, 2018: Science of the Total Environment
Lijuan Lan, Bingjie Zheng, Yao Zhang, Yonggang Hu
Removing arsenic from aquatic environments has become an urgent problem worldwide. In this study, Ti4+ - loaded bacterial spore were adopted as a novel adsorbent (spore@Ti4+ microspheres) for the adsorption efficient removal of arsenite (As(III)) and arsenate (As(V)). The developed adsorbents were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). Results indicated that the adsorption kinetics was well described by a pseudo-second-order kinetic model, and the adsorption process rapidly achieved equilibrium within 15 min at pH 7...
May 15, 2018: Chemosphere
Soham Samanta, Senjuti Halder, Gopal Das
Two, cyanine based fluorescent probes L [(E)-2-(4-(diethylamino)-2-hydroxystyryl)-3-ethyl-1,1-dimethyl-1H-benzo[e]indol-3-ium iodide] and L1 [(E)-3-ethyl-1,1-dimethyl-2-(4-nitrostyryl)-1H-benzo[e]indol-3-ium iodide] have been designed and synthesized. Among these two probes; TICT (twisted intramolecular charge transfer) based probe L can preferentially self-assemble to form nanoaggregates. L displayed a selective TURN-ON fluorescence response towards HSA and BSA in ~100% aqueous PBS buffer medium which is noticeable through naked eye whereas L1 failed to sense these albumin proteins...
May 24, 2018: Analytical Chemistry
Jeroen W A Leijtens, Thomas W A Koedam, Wernard A A Borstlap, Monique Maas, Pascal G Doornebosch, Tom M Karsten, Eric J Derksen, Laurents P S Stassen, Camiel Rosman, Eelco J R de Graaf, André J A Bremers, Jeroen Heemskerk, Geerard L Beets, Jurriaan B Tuynman, Kevin L J Rademakers
AIM: Transanal endoscopic microsurgery (TEM) is used for the resection of large rectal adenomas and well or moderately differentiated T1 carcinomas. Due to difficulty in preoperative staging, final pathology may reveal a carcinoma not suitable for TEM. Although completion total mesorectal excision is considered standard of care in T2 or more invasive carcinomas, this completion surgery is not always performed. The purpose of this article is to evaluate the outcome of patients after TEM-only, when completion surgery would be indicated...
May 23, 2018: Digestive Surgery
Arántzazu Molins, Patricia Moya, Francisco J García-Breijo, José Reig-Armiñana, Eva Barreno
Three vagrant (Circinaria hispida, Circinaria gyrosa, Circinaria sp. 'paramerae') and one crustose (semi-vagrant, Circinaria sp.'oromediterranea') lichens growing in very continental areas in the Iberian Peninsula were selected to study the phycobiont diversity. Mycobiont identification was checked using nrITS DNA barcoding: Circinaria sp.'oromediterranea' and Circinaria sp. 'paramerae' formed a new clade. Phycobiont diversity was analyzed in 50 thalli of Circinaria spp. using nrITS DNA and LSU rDNA, with microalgae coexistence being found in all the species analyzed by Sanger sequencing...
May 23, 2018: Journal of Phycology
Chen Li, Feihu Zhang, Xin Wang, Xiaoshuang Rao
In this paper, nanoindentation tests of GGG single crystal are performed on an Agilent G200 nanoindenter. The surface morphology and subsurface deformation mechanism induced by the nanoindentation are analyzed by a scanning electron microscope and a transmission electron microscope (TEM), respectively. The ductile deformation mechanism of GGG single crystal induced by the nanoindentation is a combination of "polycrystalline nanocrystallites" and "amorphous transformation." In addition, the relationships between the normal force and elastic recovery, microhardness, elastic modulus, and fracture toughness of GGG single crystal are researched...
May 10, 2018: Applied Optics
Matteo Di Giosia, Paul H H Bomans, Andrea Bottoni, Andrea Cantelli, Giuseppe Falini, Paola Franchi, Giuseppe Guarracino, Heiner Friedrich, Marco Lucarini, Francesco Paolucci, Stefania Rapino, Nico A J M Sommerdijk, Alice Soldà, Francesco Valle, Francesco Zerbetto, Matteo Calvaresi
Hybrid systems have great potential for a wide range of applications in chemistry, physics and materials science. Conjugation of a biosystem to a molecular material can tune the properties of the components or give rise to new properties. As a workhorse, here we take a C60@lysozyme hybrid. We show that lysozyme recognizes and disperses fullerene in water. AFM, cryo-TEM and high resolution X-ray powder diffraction show that the C60 dispersion is monomolecular. The adduct is biocompatible, stable in physiological and technologically-relevant environments, and easy to store...
May 23, 2018: Nanoscale
Chun Tian, Jinyun Niu, Xuerui Wei, Yujie Xu, Lifen Zhang, Zhenping Cheng, Xiulin Zhu
The performance of functional polymer nanomaterials is a vigorously discussed topic in polymer science. We devoted ourselves to investigating polymer nanomaterials based on near-infrared (NIR) fluorescence imaging and polymer prodrug in this study. Aza-boron dipyrromethene (BODIPY) is an important organic dye, having characteristics such as environmental resistance, light resistance, high molar extinction coefficient, and fluorescence quantum yield. We incorporated it into our target monomer, which can be polymerized without changing its parent structure in a polar solvent and copolymerized with water-soluble monomer to improve the solubility of the dye in an aqueous solution...
May 23, 2018: Nanoscale
Saeedeh Ansari, Saeed Masoum
A modified multiwalled carbon nanotube-based magnetic molecularly imprinted polymer (MWCNT-MMIP) was synthesized and applied for selective extraction and preconcentration of sotalol (SOT) in biological fluid samples by using ultrasonic-assisted dispersive solid-phase microextraction (UA-DSPME). The synthetic particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) analysis, vibrating sample magnetometry (VSM) and Fourier transform infrared spectroscopy (FTIR)...
May 23, 2018: Analyst
Ming Huang, Mandakini Biswal, Hyo Ju Park, Sunghwan Jin, Deshun Qu, Seokmo Hong, Zhili Zhu, Lu Qiu, Da Luo, Xiaochi Liu, Zheng Yang, Zhongliu Liu, Yuan Huang, Hyunseob Lim, Won Jong Yoo, Feng Ding, Yeliang Wang, Zonghoon Lee, Rodney S Ruoff
Fast-growth of single crystal monolayer graphene by CVD using methane and hydrogen has been achieved on "homemade" single crystal Cu/Ni(111) alloy foils over large area. Full coverage was achieved in 5 min or less for a particular range of composition (1.3 at.% to 8.6 at.% Ni), as compared to 60 min for a pure Cu(111) foil under identical growth conditions. These are the bulk atomic percentages of Ni, as a superstructure at the surface of these foils with stoichiometry Cu6 Ni1 (for 1.3 to 7.8 bulk at...
May 23, 2018: ACS Nano
Yue Chen, Yuanyuan Zhang, Qiangwei Kou, Yang Liu, Donglai Han, Dandan Wang, Yantao Sun, Yongjun Zhang, Yaxin Wang, Ziyang Lu, Lei Chen, Jinghai Yang, Scott Guozhong Xing
In this work, we report the enhanced catalytic reduction of 4-nitrophenol driven by Fe₃O₄-Au magnetic nanocomposite interface engineering. A facile solvothermal method is employed for Fe₃O₄ hollow microspheres and Fe₃O₄-Au magnetic nanocomposite synthesis via a seed deposition process. Complementary structural, chemical composition and valence state studies validate that the as-obtained samples are formed in a pure magnetite phase. A series of characterizations including conventional scanning/transmission electron microscopy (SEM/TEM), Mössbauer spectroscopy, magnetic testing and elemental mapping is conducted to unveil the structural and physical characteristics of the developed Fe₃O₄-Au magnetic nanocomposites...
May 22, 2018: Nanomaterials
Junko Matsuda, Tatsuya Kawasaki, Shotaro Futamura, Tsutomu Kawabata, Shunsuke Taniguchi, Kazunari Sasaki
In situ transmission electron microscopy (TEM) observations of a Ni(O)-Sc2O3-stabilized ZrO2 (ScSZ; 10 mol% Sc2O3, 1 mol% CeO2, 89 mol% ZrO2) anode in a solid oxide fuel cell (SOFC) have been performed at high temperatures under a hydrogen/oxygen gas atmosphere using an environmental transmission electron microscope (ETEM); the specimens were removed from cross-sections of the real SOFC by focused ion beam milling and lifting. When heating the NiO-ScSZ anode under a hydrogen atmosphere of 3 mbar in ETEM, nano-pores were formed at the grain boundaries and on the surface of NiO particles at around 400°C due to the volume shrinkage accompanying the reduction of NiO to Ni...
May 19, 2018: Microscopy
Jaber Keyvan Rad, Ali Reza Mahdavian, Samideh Khoei, Sakine Shirvalilou
Tumor-selective photodynamic therapy is a successful method for ablation of malignant and cancerous cells. Herein, we introduce the design and preparation of functionalized acrylic copolymer nanoparticles with spiropyran (SP) and imidazole groups through a facile semi-continuous emulsion polymerization. Then, Au3+ ions were immobilized and reduced on their surface to obtain photoresponsive gold-decorated polymer nanoparticles (PGPNPs). The prepared PGPNPs were surface-modified with folic acid as a site-specific tumor cell targeting agent and improve intracellular uptake via endocytosis...
May 22, 2018: ACS Applied Materials & Interfaces
P Chanphai, H A Tajmir-Riahi
It has been shown that encapsulation of dietary polyphenols leads to increased solubility and bioavailability of these micronutrients. The encapsulation of dietary polyphenols resveratrol, genistein, and curcumin by folic acid-PAMAM-G3 and folic acid-PAMAM-G4 nanoparticles was studied in aqueous solution at physiological conditions, using multiple spectroscopic methods, TEM images, and docking studies. The polyphenol bindings are via hydrophilic, hydrophobic, and H-bonding contacts with resveratrol forming more stable conjugates...
May 21, 2018: Molecular and Cellular Biochemistry
Abhishek Sahu, Youngmin Hwang, Cristian Vilos, Jong-Min Lim, Sunghyun Kim, Won Il Choi, Giyoong Tae
The calcium (Ca2+) ion concentration in the blood serum is tightly regulated, and any abnormalities in the level of serum calcium ions are associated with many potentially dangerous diseases. Thus, monitoring of the Ca2+ ion concentration in the blood serum is of fundamental importance. Gold nanoparticle (GNP)-based colorimetric biosensors have enormous potential in clinical diagnostic applications due to their simplicity, versatility, and unique optical properties. In this study, we have developed an alendronate functionalized gold nanoparticle (GNP-ALD) system for the measurement of Ca2+ ion concentration in biological samples...
May 22, 2018: Nanoscale
Young-Kyun Lim, Choong-Hyun Lee, Eung-Seok Lee, Dae-Soon Lim
In the study, a hollow boron-doped diamond (BDD) nanostructure electrode is fabricated to increase the reactive surface area for electrochemical applications. Tungsten oxide nanorods are deposited on the silicon substrate as a template by the hot filament chemical vapor deposition (HFCVD) method. The template is coated with a 100 nm BDD layer deposited by HFCVD to form a core-shell nanostructure. The WOx core is finally electrochemically dissolved to form hollow BDD nanostructure. The fabricated hollow BDD nanostructure electrode is investigated via scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy...
May 22, 2018: Nanotechnology
Haiyan Zhou, Bailong Hu, Niwen Huang, Xiangang Mo, Wei Li, Bei Zhang, Bo Wei, Mingzhu Gao, Yiming Wang, Xingde Liu, Joshua Liao
To assess T cell subsets and levels of chemokines and cytokines in patients with SLE and determine their relationships between disease activity and organ involvement. Blood samples from SLE patients (n = 24) and healthy controls (n = 36) were analyzed. Frequency of circulating follicular help T cells (Tfh), central memory T cells (Tcm), effector memory T cells (Tem), and naïve T cell subsets was enumerated and their surface markers expression of inducible T cell co-stimulator (ICOS) and programmed death 1(PD-1) protein was examined by flow cytometry...
May 22, 2018: Clinical Rheumatology
Yuanling Sun, Chaofan Ding, Yanna Lin, Weiyan Sun, Hao Liu, Xiaodong Zhu, Yuxue Dai, Chuannan Luo
In this work, a highly selective and sensitive chemiluminescence (CL) biosensor was prepared for adenosine (AD) detection based on carbon quantum dots (CQDs) catalyzing the CL system of luminol-H2 O2 under alkaline environment and CQDs was released from the surface of AD aptamers functionalized graphene @ magnetic β-cyclodextrin polymers (GO@Fe3 O4 @β-CD@A-Apt). Firstly, GO@Fe3 O4 @β-CD and CQDs were prepared and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), UV-Vis absorption spectra (UV), fluorescence spectra (FL), fourier transform infrared (FTIR) and X-ray powder diffraction (XRD)...
August 15, 2018: Talanta
Peng Dong, Runhua Yao, Zheng Yan, Zhifeng Yan, Wenxian Wang, Xiuli He, Jun Zhou
Laser welding has been considered to be one of the most promising joining processes for Nitinol medical device manufacturing. Presently, there is still a limited understanding about how laser welding affects the microstructure and the resultant corrosion behaviors. This work aimed to reveal the microstructural factors that influence the corrosion resistance of laser-welded crossed Nitinol joints. The microstructures within various zones of the joints were characterized by using transmission electron microscopy (TEM), and the corrosion behaviors of the joints in 0...
May 18, 2018: Materials
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