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Nanomaterials

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https://www.readbyqxmd.com/read/28938619/anti-cancer-efficacy-of-biotinylated-chitosan-nanoparticles-in-liver-cancer
#1
Mingrong Cheng, Weiping Zhu, Qing Li, Dejian Dai, Yiming Hou
The present study investigated the synthesis of biotinylated chitosan (Bio-CS) from chitosan using a nanomaterial skeleton with biotin and the successful targeting of the formulation in liver cancer cells. Bio-CS was validated by fourier transformed infrared spectroscopy and hydrogen(-1) nuclear magnetic resonance spectroscopy. Bio-CS and plasmid DNA were used to construct Bio-CS/plasmid DNA nanoparticles according to the optimal molar ratio of 1:1 and the optimal pH-value of 5.5. Under these conditions, the parameters mean particle size, potential, encapsulation rate and drug loading, were 82...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28938207/zinc-oxide-nanoparticles-in-predicted-environmentally-relevant-concentrations-leading-to-behavioral-impairments-in-male-swiss-mice
#2
Joyce Moreira de Souza, Bruna de Oliveira Mendes, Abraão Tiago Batista Guimarães, Aline Sueli de Lima Rodrigues, Thales Quintão Chagas, Thiago Lopes Rocha, Guilherme Malafaia
Although the potential neurotoxic effects from the exposure to zinc oxide nanoparticles (ZnO NPs) on humans and on experimental models have been reported in previous studies, the effects from the exposure to environmentally relevant concentrations of them remain unclear. Thus, the aim of the present study is to investigate the effects from the exposure to environmentally relevant concentrations of ZnO NPs on the behavior of male Swiss mice. The animals were daily exposed to environmentally relevant concentrations of ZnO NPs (5...
September 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28937916/nanoparticles-for-advanced-photodynamic-therapy-of-cancer
#3
Heidi Abrahamse, Cherie Ann Kruger, Sania Kadanyo, Ajay Mishra
The world widespread rise in cancer incidence has caused an increase in the demand for effective and safe materials for treatment. One of the most prevalent forms of treatment for cancer is photodynamic therapy (PDT), which is seen as an alternative to radiotherapy, as well as chemotherapy. In more recent years, researchers are exploring new nanotechnology-based strategies to improve the effectiveness of PDT. OBJECTIVE: The objective of this review is to explore the current trends and research findings associated with PDT and the development of nanotechnology as treatment modality for cancer...
September 21, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28937749/heterooctamolybdate-based-clusters-h3-cp-rh-4pmo8o32-and-h5-na2-cp-ir-4pmo8o34-and-derived-hybrid-nanomaterials-with-efficient-electrocatalytic-hydrogen-evolution-reaction-activity
#4
Vikram Singh, Pengtao Ma, Michael G B Drew, Jingyang Niu, Jingping Wang, Guo-Xin Jin
Polyoxometalates (POMs), emerging as a new class of porous molecular materials, play a promising role in homo- and heterogeneous catalysis. Among them, noble-metal-decorated POMs have a profound impact as catalytic materials. Thus, it is imperative to design and structurally explore new catalysts including noble metals. Herein, two new clusters, H3[(Cp*Rh)4PMo8O32]·14H2O (1) and H5[Na2(Cp*Ir)4PMo8O34]·13H2O (2) (Cp* = pentamethylcyclopentadienyl), based on a heterooctamolybdate anionic core were successfully obtained via a one-pot reaction using [Cp*MCl2]2 [M = Rh (1) and Ir (2)] and Na2MoO4 in acidic conditions...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28937666/nucleic-acid-nanomaterials-silver-wired-dna
#5
Pascal Auffinger, Eric Ennifar
No abstract text is available yet for this article.
September 22, 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28937663/a-metallo-dna-nanowire-with-uninterrupted-one-dimensional-silver-array
#6
Jiro Kondo, Yoshinari Tada, Takenori Dairaku, Yoshikazu Hattori, Hisao Saneyoshi, Akira Ono, Yoshiyuki Tanaka
The double-helix structure of DNA, in which complementary strands reversibly hybridize to each other, not only explains how genetic information is stored and replicated, but also has proved very attractive for the development of nanomaterials. The discovery of metal-mediated base pairs has prompted the generation of short metal-DNA hybrid duplexes by a bottom-up approach. Here we describe a metallo-DNA nanowire-whose structure was solved by high-resolution X-ray crystallography-that consists of dodecamer duplexes held together by four different metal-mediated base pairs (the previously observed C-Ag-C, as well as G-Ag-G, G-Ag-C and T-Ag-T) and linked to each other through G overhangs involved in interduplex G-Ag-G...
October 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28937596/synthesis-of-multi-walled-carbon-nanotubes-from-plastic-waste-using-a-stainless-steel-cvd-reactor-as-catalyst
#7
Pranav K Tripathi, Shane Durbach, Neil J Coville
The disposal of non-biodegradable plastic waste without further upgrading/downgrading is not environmentally acceptable and many methods to overcome the problem have been proposed. Herein we indicate a simple method to make high-value nanomaterials from plastic waste as a partial solution to the environmental problem. Laboratory-based waste centrifuge tubes made of polypropylene were chosen as a carbon source to show the process principle. In the process, multi-walled carbon nanotubes (MWCNTs) were synthesized from plastic waste in a two-stage stainless steel 316 (SS 316) metal tube that acted as both reactor vessel and catalyst...
September 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28937307/weight-of-evidence-analysis-for-assessing-the-genotoxic-potential-of-carbon-nanotubes
#8
Peter Møller, Nicklas Raun Jacobsen
Carbon nanotube (CNT) is a nanomaterial that has received interest because of its high-tensile strength and low weight. Although CNTs differ substantially in physico-chemical properties, they share high aspect ratio which resembles that of asbestos and other fibers causing lung cancer and mesothelioma. One type of multi-walled CNTs (i.e. MWCNT-7) has been classified as possibly carcinogenic to humans by IARC (Group 2B) based on experimental animal data, whereas other types of MWCNTs and single-walled CNTs (SWCNT) could not be classified due to lack of data from epidemiologic studies and insufficient mechanistic evidence...
September 22, 2017: Critical Reviews in Toxicology
https://www.readbyqxmd.com/read/28937208/composition-dependent-morphology-of-bi-and-trimetallic-phosphides-construction-of-amorphous-pd-cu-ni-p-nanoparticles-as-a-selective-and-versatile-catalyst
#9
Ming Zhao, Yuan Ji, Mengyue Wang, Ning Zhong, Zinan Kang, Naoki Asao, Wen-Jie Jiang, Qiang Chen
Amorphous materials have been widely researched in heterogeneous catalysis and for next-generation batteries. However, the well-defined production of high-quality (e.g., monodisperse and high surface area) amorphous alloy nanomaterials has rarely been reported. In this work, we investigated the correlations among the composition, morphology, and catalysis of various Pd-M-P NPs (M = Cu or Ni), which indicated that less Cu (≤20 at%) was necessary for the formation of an amorphous morphology. The amorphous Pd-Cu-Ni-P NPs were fabricated with a controllable size and characterized carefully, which show excellent selective catalysis in the semi-hydrogenation of alkynes, hydrogenation of quinoline, and oxidation of primary alcohols...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28934917/sparse-supervised-classification-methods-predict-and-characterize-nanomaterial-exposures-independent-markers-of-mwcnt-exposures
#10
Naveena Yanamala, Marlene S Orandle, Vamsi K Kodali, Lindsey Bishop, Patti C Zeidler-Erdely, Jenny R Roberts, Vincent Castranova, Aaron Erdely
Recent experimental evidence indicates significant pulmonary toxicity of multiwalled carbon nanotubes (MWCNTs), such as inflammation, interstitial fibrosis, granuloma formation, and carcinogenicity. Although numerous studies explored the adverse potential of various CNTs, their comparability is often limited. This is due to differences in administered dose, physicochemical characteristics, exposure methods, and end points monitored. Here, we addressed the problem through sparse classification method, a supervised machine learning approach that can reduce the noise contained in redundant variables for discriminating among MWCNT-exposed and MWCNT-unexposed groups...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28934118/graphene-based-materials-for-biosensors-a-review
#11
REVIEW
Phitsini Suvarnaphaet, Suejit Pechprasarn
The advantages conferred by the physical, optical and electrochemical properties of graphene-based nanomaterials have contributed to the current variety of ultrasensitive and selective biosensor devices. In this review, we present the points of view on the intrinsic properties of graphene and its surface engineering concerned with the transduction mechanisms in biosensing applications. We explain practical synthesis techniques along with prospective properties of the graphene-based materials, which include the pristine graphene and functionalized graphene (i...
September 21, 2017: Sensors
https://www.readbyqxmd.com/read/28934117/new-zno-cardanol-porphyrin-composite-nanomaterials-with-enhanced-photocatalytic-capability-under-solar-light-irradiation
#12
Viviane Gomes Pereira Ribeiro, Ana Maria Pereira Marcelo, Kássia Teixeira da Silva, Fernando Luiz Firmino da Silva, João Paulo Ferreira Mota, João Paulo Costa do Nascimento, Antonio Sérgio Bezerra Sombra, Claudenilson da Silva Clemente, Giuseppe Mele, Luigi Carbone, Selma Elaine Mazzetto
This work describes the synthesis, characterization, and photocatalytic activity of new composite nanomaterials based on ZnO nanostructures impregnated by lipophlilic porphyrins derived from cashew nut shell liquid (CNSL). The obtained nanomaterials were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and steady-state photoluminescence spectra (PL). The results confirm nanostructures showing average diameter of 55 nm and an improved absorption in the visible region...
September 21, 2017: Materials
https://www.readbyqxmd.com/read/28934114/antimicrobial-nanomaterials-why-evolution-matters
#13
Joseph L Graves, Misty Thomas, Jude Akamu Ewunkem
Due to the widespread occurrence of multidrug resistant microbes there is increasing interest in the use of novel nanostructured materials as antimicrobials. Specifically, metallic nanoparticles such as silver, copper, and gold have been deployed due to the multiple impacts they have on bacterial physiology. From this, many have concluded that such nanomaterials represent steep obstacles against the evolution of resistance. However, we have already shown that this view is fallacious. For this reason, the significance of our initial experiments are beginning to be recognized in the antimicrobial effects of nanomaterials literature...
September 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28933537/membrane-fluidity-sensing-on-the-single-virus-particle-level-with-plasmonic-nanoparticle-transducers
#14
Amin Feizpour, David N Stelter, Crystal Wong, Hisashi Akiyama, Suryaram Gummuluru, Tom Keyes, Bjoern M Reinhard
Viral membranes are nanomaterials whose fluidity depends on their composition, in particular the cholesterol (chol) content. As differences in the membrane composition of individual virus particles can lead to different intracellular fates, biophysical tools capable of sensing the membrane fluidity on the single-virus level are required. In this manuscript, we demonstrate that fluctuations in the polarization of light scattered off gold or silver nanoparticle (NP)-labeled virus-like-particles (VLPs) encode information about the membrane fluidity of individual VLPs...
September 21, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28933474/exfoliation-of-graphene-and-fluorographene-in-molecular-and-ionic-liquids
#15
Émilie Bordes, Joanna Szala-Bilnik, Agílio A H Pádua
We use molecular dynamics simulations to study the exfoliation of graphene and fluorographene in molecular and ionic liquids, by performing computer experiments in which one layer of the 2D nanomaterial is peeled from a stack, in vacuum and in the presence of solvent. The liquid media and the nanomaterials are represented by fully flexible, atomistic force fields. From these simulations we calculate the potential of mean force, or reversible work, required to exfoliate the materials. Calculations in water and organic liquids showed that small amides (NMP, DMF) are among the best solvents for exfoliation, in agreement with the experiment...
September 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28933472/gas-adsorption-capacity-in-an-all-carbon-nanomaterial-composed-of-carbon-nanohorns-and-vertically-aligned-carbon-nanotubes
#16
Divya Puthusseri, Deepu J Babu, Sherif Okeil, Jörg J Schneider
Whereas vertically aligned carbon nanotubes (VACNTs) typically show a promising adsorption behavior at high pressures, carbon nanohorns (CNHs) exhibit superior gas adsorption properties in the low pressure regime due to their inherent microporosity. These adsorption characteristics are further enhanced when both materials are opened at their tips. The so prepared composite material allows one to investigate the effect of physical entrapment of CO2 molecules within the specific adsorption sites of VACNTs composed of opened double walled carbon nanotubes (CNTs) and in specific adsorption sites created by spherically aggregated opened single walled carbon nanohorns...
September 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28933459/two-dimensional-nanomaterial-based-field-effect-transistors-for-chemical-and-biological-sensing
#17
REVIEW
Shun Mao, Jingbo Chang, Haihui Pu, Ganhua Lu, Qiyuan He, Hua Zhang, Junhong Chen
Meeting the increasing demand for sensors with high sensitivity, high selectivity, and rapid detection presents many challenges. In the last decade, electronic sensors based on field-effect transistors (FETs) have been widely studied due to their high sensitivity, rapid detection, and simple test procedure. Among these sensors, two-dimensional (2D) nanomaterial-based FET sensors have been demonstrated with tremendous potential for the detection of a wide range of analytes which is attributed to the unique structural and electronic properties of 2D nanomaterials...
September 21, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28933302/smart-organic-inorganic-nanogels-for-activatable-theranostics
#18
Fangyuan Li, Zeyu Liang, Daishun Ling
Intelligent polymeric nanogels, with the rationally designed stimuli-responsive drug delivery and controlled drug release, have attracted considerable attention as an ideal nanoplatform for activatable therapy. On the other hand, functional inorganic nanomaterials are widely used as medical imaging agents due to their unique magnetic or optical properties. The construction of stimuli-responsive polymeric nanogels incorporating with functional inorganic nanomaterials inherits the excellent properties of both polymers and inorganic nanomaterials, consequently, the resulted organic-inorganic hybrid nanogels naturally exhibit stimuli-responsive multi-functionalities for both imaging and therapy...
September 20, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28933294/biodegradable-black-phosphorus-based-nanomaterials-in-biomedicine-theranostic-applications
#19
Zhen Wang, Zhiming Liu, Chengkang Su, Biwen Yang, Xixi Fei, Yi Li, Yuqing Hou, Henan Zhao, Yanxian Guo, Zhengfei Zhuang, Huiqing Zhong, Zhouyi Guo
Ascribe to the unique two-dimensional planar nanostructure with exceptional physical and chemical properties, black phosphorous (BP) as the emerging inorganic two-dimensional nanomaterial with high biocompatibility and degradability has been becoming one of the most promising materials of great potentials in biomedicine. The exfoliated BP sheets possess ultra-high surface area available for valid bio-conjugation and molecular loading for chemotherapy. Utilizing the intrinsic near-infrared optical absorbance, BP-based photothermal therapy in vivo, photodynamic therapy and biomedical imaging has been realized, achieving unprecedented anti-tumor therapeutic efficacy in animal experiments...
September 20, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28933283/organic-nanotheranostics-for-photoacoustic-imaging-guided-phototherapy
#20
Houjuan Zhu, Chen Xie, Peng Chen, Kanyi Pu
Phototherapies including photothermal therapy (PTT) and photodynamic therapy (PDT) have emerged as one of the avant-garde strategies for cancer treatment. Photoacoustic (PA) imaging is a new hybrid imaging modality that shows great promise for real-time in vivo monitoring of biological processes with deep tissue penetration and high spatial resolution. To enhance therapeutic efficiency and reduce side effects, it is necessary to explore the combination of cancer therapy and diagnosis. Nanotheranostics composed of PTT/PDT and PA imaging are emerging to provide unprecedented advantages in accelerating cancer theranostics...
September 20, 2017: Current Medicinal Chemistry
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