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https://www.readbyqxmd.com/read/28719862/green-biosynthesis-of-silver-nanoparticles-using-leaves-extract-of-artemisia-vulgaris-and-their-potential-biomedical-applications
#1
Tahir Rasheed, Muhammad Bilal, Hafiz M N Iqbal, Chuanlong Li
Biosynthesis of nanoparticles from plant extracts is receiving enormous interest due to their abundant availability and a broad spectrum of bioactive reducing metabolites. In this study, the reducing potential of Artemisia vulgaris leaves extract (AVLE) was investigated for synthesizing silver nanoparticles without the addition of any external reducing or capping agent. The appearance of blackish brown color evidenced the complete synthesis of nanoparticles. The synthesized silver nanoparticles were characterized by UV-vis spectroscopy, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), atomic force microscopy (AFM) and Fourier transforms infrared spectroscopy (FT-IR) analysis...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719861/stabilized-cationic-dipeptide-capped-gold-silver-nanohybrids-towards-enhanced-antibacterial-and-antifungal-efficacy
#2
Manish Bajaj, Satish K Pandey, Tamanna Nain, Surinder K Brar, Prabhjot Singh, Shivakanksha Singh, Nishima Wangoo, Rohit K Sharma
The nanoparticles of silver/gold and cationic peptides have been recognized as potent antimicrobials for long, but their combined effect has so far not been explored. The present study reports the green synthesis of short cationic dipeptide stabilized AuNPs/AgNPs based nanohybrid materials. It thoroughly investigates the effect of conjugation of short cationic peptides on the antimicrobial properties of metallic nanoparticles. In the context of the antimicrobial evaluation of synthesized nanoconjugates, it was observed that peptide capped AgNPs exhibited higher antimicrobial activity as compared to peptide capped AuNPs as well as native peptides and unconjugated metallic nanoparticles...
July 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719856/contribution-of-kupffer-cells-to-liposome-accumulation-in-the-liver
#3
Emma Samuelsson, Haifa Shen, Elvin Blanco, Mauro Ferrari, Joy Wolfram
The liver is a major barrier for site-specific delivery of systemically injected nanoparticles, as up to 90% of the dose is usually captured by this organ. Kupffer cells are thought to be the main cellular component responsible for nanoparticle accumulation in the liver. These resident macrophages form part of the mononuclear phagocyte system, which recognizes and engulfs foreign bodies in the circulatory system. In this study, we have compared two strategies for reducing nanoparticle accumulation in the liver, in order to investigate the specific contribution of Kupffer cells...
July 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28719846/preparation-characterization-and-application-of-tio2-patterned-polyimide-film-as-a-photocatalyst-for-oxidation-of-organic-contaminants
#4
Subramaniyan Ramasundaram, Mingizem Gashaw Seid, Wonseop Lee, Chan Ul Kim, Eun-Ju Kim, Seok Won Hong, Kyoung Jin Choi
Photocatalytically active TiO2-patterned polyimide (PI) films (PI-TiO2) were fabricated using thermal transfer patterning (TTP). When subjected to hot pressing, the TiO2 nanoparticles electrosprayed on steel mesh templates were successfully transferred and formed checker plate patterns on PI film. FE-SEM studies confirmed that pressing at 350°C and 100MPa was optimum for obtaining patterns with uniform TiO2 coverage. When the quantity of TiO2 on the template increased, the amount of it immobilized on PI film also increased from 0...
June 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28719818/insights-into-the-unique-functionality-of-inorganic-micro-nanoparticles-for-versatile-ultrasound-theranostics
#5
REVIEW
Xiaoqin Qian, Xiaoxia Han, Yu Chen
The clinical ultrasound (US)-based theranostic biomedicine suffers from the critical issue that traditional microbubbles (MBs) have lots of drawbacks such as low stability, large particle size, difficult structural control, etc. The unique composition, structure and functionality of inorganic micro/nanoplatforms have shown their great prospect for solving these critical issues and drawbacks of traditional organic MBs. This review summarizes and discusses the state-of-art development on exploring inorganic micro/nanoparticles for versatile US-based biomedical applications, ranging from US imaging, photoacoustic imaging, sonodynamic therapy, high intensity-focused US ablation and US-triggered chemotherapy...
July 11, 2017: Biomaterials
https://www.readbyqxmd.com/read/28719745/highly-efficient-water-decontamination-by-using-sub-10-nm-feooh-confined-within-millimeter-sized-mesoporous-polystyrene-beads
#6
Xiaolin Zhang, Cheng Cheng, Jieshu Qian, Zhenda Lu, Siyuan Pan, Bing-Cai Pan
Millimeter-sized polymer-based FeOOH nanoparticles (NPs) provide a promising option to overcome the bottlenecks of direct use of NPs in scaled-up water purification, and decreasing the NP size below 10 nm is expected to improve the decontamination efficiency of the polymeric nanocomposites due to the size and surface effect. However, it is still challenging to control the dwelled FeOOH NP sizes to sub-10 nm, mainly due to the wide pore size distribution of the currently available polymeric hosts. Herein, we synthesized mesoporous polystyrene beads (MesoPS) via flash freezing to assemble FeOOH NPs...
July 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28719741/macroscopic-strain-induced-transition-from-quasi-infinite-gold-nanoparticle-chains-to-defined-plasmonic-oligomers
#7
Anja Maria Steiner, Martin Mayer, Maximilian Seuss, Svetoslav Nikolov, Kenneth D Harris, Alexander Alexeev, Christian Kuttner, Tobias A F Koenig, Andreas Fery
We investigate the formation of chains of few plasmonic nanoparticles - so called plasmonic oligomers - by strain induced fragmentation of linear particle assemblies. Detailed investigations of the fragmentation process are conducted by in-situ atomic force microscopy (AFM) and UV-vis-NIR spectroscopy. Based on these experimental results and mechanical simulations computed by the lattice spring model (LSM), we propose a formation mechanism which explains the observed decrease of chain polydispersity upon increasing strain and provides experimental guidelines for tailoring chain length distribution...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719739/graphene-electronic-tattoo-sensors
#8
Shideh Kabiri Ameri, Rebecca Ho, Hongwoo Jang, Li Tao, Youhua Wang, Liu Wang, David M Schnyer, Deji Akinwande, Nanshu Lu
Tattoo-like epidermal sensors are an emerging class of truly wearable electronics owing to their thinness and softness. While most of them are based on thin metal films, silicon membrane, or nanoparticle-based printable inks, we report a sub-micron thick, multimodal electronic tattoo sensors that are made of graphene. The graphene electronic tattoo (GET) is designed with filamentary serpentines and fabricated by a cost- and time-effective "wet transfer, dry patterning" method. It has a total thickness of 463 ± 30 nm, an optical transparency of ~85%, and a stretchability of more than 40%...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719613/visual-detection-of-brucella-in-bovine-biological-samples-using-dna-activated-gold-nanoparticles
#9
Dheeraj Pal, Nongthombam Boby, Satish Kumar, Gurpreet Kaur, Syed Atif Ali, Julien Reboud, Sameer Shrivastava, Praveen K Gupta, Jonathan M Cooper, Pallab Chaudhuri
Brucellosis is a bacterial disease, which, although affecting cattle primarily, has been associated with human infections, making its detection an important challenge. The existing gold standard diagnosis relies on the culture of bacteria which is a lengthy and costly process, taking up to 45 days. New technologies based on molecular diagnosis have been proposed, either through dip-stick, immunological assays, which have limited specificity, or using nucleic acid tests, which enable to identify the pathogen, but are impractical for use in the field, where most of the reservoir cases are located...
2017: PloS One
https://www.readbyqxmd.com/read/28719576/laser-induced-plasmonic-colours-on-metals
#10
Jean-Michel Guay, Antonino Calà Lesina, Guillaume Côté, Martin Charron, Daniel Poitras, Lora Ramunno, Pierre Berini, Arnaud Weck
Plasmonic resonances in metallic nanoparticles have been used since antiquity to colour glasses. The use of metal nanostructures for surface colourization has attracted considerable interest following recent developments in plasmonics. However, current top-down colourization methods are not ideally suited to large-scale industrial applications. Here we use a bottom-up approach where picosecond laser pulses can produce a full palette of non-iridescent colours on silver, gold, copper and aluminium. We demonstrate the process on silver coins weighing up to 5 kg and bearing large topographic variations (∼1...
July 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28719217/single-molecule-study-on-polymer-nanoparticle-interactions-the-particle-shape-matters
#11
Zhandong Li, Bin Zhang, Yu Song, Yurui Xue, Lixin Wu, Wenke Zhang
The study on the nanoparticle-polymer interactions is very important for the design/preparation of high performance polymer nanocomposite. Here we present a method to quantify the polymer-particle interaction at single molecule level by using AFM-based single molecule force spectroscopy (SMFS). As a proof-of-concept study, we choose Poly-L-Lysine (PLL) as the polymer and several different types of polyoxometalates (POM) as the model particles to construct several different polymer nanocomposites and to reveal the binding mode and quantify the binding strength in these systems...
July 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28719196/thermoresponsive-elastin-b-collagen-like-peptide-bioconjugate-nanovesicles-for-targeted-drug-delivery-to-collagen-containing-matrices
#12
Tianzhi Luo, Michael A David, Lucas C Dunshee, Rebecca A Scott, Morgan A Urello, Christopher Price, Kristi L Kiick
Over the past few decades, (poly)peptide block copolymers have been widely employed in generating well-defined nanostructures as vehicles for targeted drug delivery applications. We previously reported the assembly of thermoresponsive nanovesicles from an elastin-b-collagen like peptide (ELP-CLP). The nanoparticles were observed to dissociate at elevated temperatures, despite the LCST-like behavior of the tethered ELP domain, which is suggested to be triggered by the unfolding of the CLP domain. Here, the potential of using the nanoparticles as drug delivery vehicles for targeting collagen-containing matrices is evaluated...
July 18, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28719184/nanoparticle-mediated-mechanical-destruction-of-cell-membranes-a-coarse-grained-molecular-dynamics-study
#13
Liuyang Zhang, Yiping Zhao, Xianqiao Wang
The effects of binding mode, shape, binding strength, and rotational speed of actively rotating nanoparticles on the integrity of cell membranes have been systematically studied using dissipative particle dynamics simulations. With theoretical analyses of lipid density, surface tension, stress distribution, and water permeation, we demonstrate that the rotation of nanoparticles can provide a strong driving force for membrane rupture. The results show that nanoparticles embedded inside a cell membrane via endocytosis are more capable of producing large membrane deformations under active rotation than nanoparticles attached on the cell membrane surface...
July 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28719145/preparation-of-carbon-dot-based-ratiometric-fluorescent-probes-for-cellular-imaging-from-curcuma-longa
#14
Zihnil Adha Islamy Mazrad, Eun Bi Kang, Insik In, Sung Young Park
This work derived biocompatible and stable probes based on fluorescent nanoparticles (FNPs) from a natural source, Curcuma longa. The multi-color fluorescence emissions from carbonized Curcuma longa (C-FNPs) obtained through defined dehydration conditions are soluble in water and have a small particle size (~17 nm). The surface passivation with polyethylene glycol (PEG) capped with amine groups in FNPs (P-FNPs) generated a probe with a higher quantum yield and longer fluorescence lifetime than obtained with C-FNPs...
July 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28719098/a-pyridoindole-based-multifunctional-bioprobe-ph-induced-fluorescence-switching-and-specific-targeting-of-lipid-droplets
#15
Bahadur Sk, Pilendra Thakre, Raghuvir Singh Tomar, Abhijit Patra
A versatile fluorescent probe, PITE, based on alkyl substituted pyridoindole (PI) and tetraphenylethylene (TE) exhibiting facile pH-induced fluorescence switching in solution, nanoparticles and solid state is presented. Strong fluorescence in the solid state besides solution and aggregated state allow sensing of toxic acid vapor. Fluorescence "off-on" switching of PITE by exposing to trifluoracetic acid and triethylamine vapor is visualized through naked eyes. A unified picture of switchable fluorescence of PITE is obtained by comprehensive spectroscopic investigations coupled with quantum mechanical calculations...
July 18, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28719071/mesoporous-silica-thin-membranes-with-large-vertical-mesochannels-for-nanosize-based-separation
#16
Yupu Liu, Dengke Shen, Gang Chen, Ahmed A Elzatahry, Manas Pal, Hongwei Zhu, Longlong Wu, Jianjian Lin, Daifallah Al-Dahyan, Wei Li, Dongyuan Zhao
Membrane separation technologies are of great interest in industrial processes such as water purification, gas separation, and materials synthesis. However, commercial filtration membranes have broad pore size distributions, leading to poor size cutoff properties. In this work, mesoporous silica thin membranes with uniform and large vertical mesochannels are synthesized via a simple biphase stratification growth method, which possess an intact structure over centimeter size, ultrathin thickness (≤50 nm), high surface areas (up to 1420 m(2) g(-1) ), and tunable pore sizes from ≈2...
July 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28719065/unconventional-route-to-uniform-hollow-semiconducting-nanoparticles-with-tailorable-dimensions-compositions-surface-chemistry-and-near-infrared-absorption
#17
Yanjie He, Xinchang Pang, Beibei Jiang, Chaowei Feng, Yeu Wei Harn, Yihuang Chen, Young Jun Yoon, Shuang Pan, Cheng-Hsin Lu, Yajing Chang, Mona Zebarjadi, Zhitao Kang, Naresh Thadhani, Juan Peng, Zhiqun Lin
Despite recent impressive advances in synthesizing lead chalcogenide solid nanoparticles, there are no demonstrations of lead chalcogenide hollow nanoparticles (HNPs) with controlled hollow diameter and shell thickness as current synthetic approaches for HNPs have inherent limitations associated with inability to precisely control the dimensions and restriction of applicable materials in scope. Herein, we report on an unconventional strategy for crafting uniform PbS and PbTe HNPs with tailorable size, surface chemistry, and near-IR absorption...
July 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28719053/microwave-assisted-synthesis-of-metal-organic-framework-mil-101-nanocrystals-as-sorbent-and-pseudostationary-phase-in-capillary-electrophoresis-for-the-separation-of-anthraquinones-in-environmental-water-samples
#18
Yue Liu, Jia Hu, Yan Li, Yun-Tao Shang, Jia-Qi Wang, Ye Zhang, Zhong-Liang Wang
In this work, a CE method was developed to separate five anthraquinones: aloe-emodin, rhein, emodin, chrysophanol and physcion. The CE method used a nano-sized metal organic framework MIL-101 (nMIL-101) as pseudostationary phase (PSP) and sorbent for dispersed particle extraction (DPE). The nMIL-101 was synthesized by microwave technique and was characterized by UV-vis, TEM, Zeta potential, X-ray diffraction spectrometry and micropore physisorption. In this method, anthraquinones were adsorbed by nMIL-101 of a fast kinetics within 10 min and then separated by CE...
July 18, 2017: Electrophoresis
https://www.readbyqxmd.com/read/28719031/desert-beetle-inspired-superwettable-patterned-surfaces-for-water-harvesting
#19
Zhenwei Yu, Frank F Yun, Yanqin Wang, Li Yao, Shixue Dou, Kesong Liu, Lei Jiang, Xiaolin Wang
With the impacts of climate change and impending crisis of clean drinking water, designing functional materials for water harvesting from fog with large water capacity has received much attention in recent years. Nature has evolved different strategies for surviving dry, arid, and xeric conditions. Nature is a school for human beings. In this contribution, inspired by the Stenocara beetle, superhydrophilic/superhydrophobic patterned surfaces are fabricated on the silica poly(dimethylsiloxane) (PDMS)-coated superhydrophobic surfaces using a pulsed laser deposition approach with masks...
July 18, 2017: Small
https://www.readbyqxmd.com/read/28718979/in-situ-two-step-photoreduced-sers-materials-for-on-chip-single-molecule-spectroscopy-with-high-reproducibility
#20
Wenjie Yan, Longkun Yang, Jianing Chen, Yaqi Wu, Peijie Wang, Zhipeng Li
A method is developed to synthesize surface-enhanced Raman scattering (SERS) materials capable of single-molecule detection, integrated with a microfluidic system. Using a focused laser, silver nanoparticle aggregates as SERS monitors are fabricated in a microfluidic channel through photochemical reduction. After washing out the monitor, the aggregates are irradiated again by the same laser. This key step leads to full reduction of the residual reactants, which generates numerous small silver nanoparticles on the former nanoaggregates...
July 18, 2017: Advanced Materials
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