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https://www.readbyqxmd.com/read/29783111/polymeric-nanocomposites-for-the-removal-of-acid-red-52-dye-from-aqueous-solutions-synthesis-characterization-kinetic-and-isotherm-studies
#1
A Gouthaman, Raja S Azarudeen, A Gnanaprakasam, V M Sivakumar, M Thirumarimurugan
Polymeric nanocomposites polyaniline-polyvinylpyrrolidone (PAPV) and polyaniline-polyvinylpyrrolidone-neodymium/zinc oxide (PAPV-NZO) were synthesized for the effective dye removal through adsorption process. Neodymium doped zinc oxide (NZO) with various proportions of neodymium were prepared by chemical co-precipitation method and incorporated into the copolymer matrix via oxidative polymerization technique. NZO nanoparticles were characterized by X-ray diffraction (XRD) and the morphological features, and functional group linkages of the PAPV-NZO were confirmed by scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analyses...
May 18, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29782971/pharmaceutical-grade-oral-films-as-substrates-for-printed-medicine
#2
M Wimmer-Teubenbacher, C Planchette, H Pichler, D Markl, W K Hsiao, A Paudel, S Stegemann
In contact-less printing, such as piezo-electric drop on demand printing used in the study, the drop formation process is independent of the substrate. This means that having developed a printable formulation, printed pharmaceutical dosage forms can be obtained on any pharmaceutical grade substrate, such as polymer-based films. In this work we evaluated eight different oral films based on their suitability as printing substrates for sodium picosulfate. The different polymer films were compared regarding printed spot morphology, chemical stability and dissolution profile...
May 18, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29781446/pyro-phototronic-nanogenerator-based-on-flexible-2d-zno-graphene-heterojunction-and-its-application-in-self-powered-near-infrared-photodetector-and-active-analog-frequency-modulation
#3
Parikshit Sahatiya, Akash Shinde, Sushmee Badhulika
Even though 2D ZnO has been utilized for enhanced self-powered sensing by strain modulation due to its piezoelectric property, study on utilizing pyroelectric property of ZnO remains unexplored. The piezoelectric property of 2D ZnO works on mechanical strain which disrupts the structure of ZnO leading to the failure of device. For pyroelectric nanogenerator, temperature difference can be triggered by external light source which does not disrupt the ZnO structure and also avoids the need for physical bending/pressing as in case of piezoelectric nanogenerator...
May 21, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29780505/macrophage-mediated-delivery-of-light-activated-nitric-oxide-prodrugs-with-spatial-temporal-and-concentration-control
#4
Michael A Evans, Po-Ju Huang, Yuji Iwamoto, Kelly N Ibsen, Emory M Chan, Yutaka Hitomi, Peter C Ford, Samir Mitragotri
Nitric oxide (NO) holds great promise as a treatment for cancer hypoxia, if its concentration and localization can be precisely controlled. Here, we report a "Trojan Horse" strategy to provide the necessary spatial, temporal, and dosage control of such drug-delivery therapies at targeted tissues. Described is a unique package consisting of (1) a manganese-nitrosyl complex, which is a photoactivated NO-releasing moiety (photoNORM), plus Nd3+ -doped upconverting nanoparticles (Nd-UCNPs) incorporated into (2) biodegradable polymer microparticles that are taken up by (3) bone-marrow derived murine macrophages...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780499/rational-design-of-a-water-soluble-nir-aiegen-and-its-application-in-ultrafast-wash-free-cellular-imaging-and-photodynamic-cancer-cell-ablation
#5
Dong Wang, Huifang Su, Ryan T K Kwok, Xianglong Hu, Hang Zou, Qianxin Luo, Michelle M S Lee, Wenhan Xu, Jacky W Y Lam, Ben Zhong Tang
The synthesis of water-soluble near-infrared (NIR)-emissive fluorescent molecules with aggregation-induced emission (AIE) characteristics and theranostic functions is highly desirable but remains challenging. In this work, we designed and readily prepared for the first time such a molecule with AIE features, good water-solubility and intense emission in the NIR region. This AIE luminogen (AIEgen) is able to specifically "light up" the cell membrane without the involvement of a washing procedure. Interestingly, the staining process can be performed by simply shaking the culture with cells at room temperature for only a few seconds after the addition of the AIEgen, indicating an ultrafast and easy-to-operate staining protocol...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780488/a-pre-protective-strategy-for-precise-tumor-targeting-and-efficient-photodynamic-therapy-with-a-switchable-dna-upconversion-nanocomposite
#6
Zhengze Yu, Yegang Ge, Qiaoqiao Sun, Wei Pan, Xiuyan Wan, Na Li, Bo Tang
Tumor-specific targeting based on folic acid (FA) is one of the most common and significant approaches in cancer therapy. However, the expression of folate receptors (FRs) in normal tissues will lead to unexpected targeting and unsatisfactory therapeutic effect. To address this issue, we develop a pre-protective strategy for precise tumor targeting and efficient photodynamic therapy (PDT) using a switchable DNA/upconversion nanocomposite, which can be triggered in the acidic tumor microenvironment. The DNA/upconversion nanocomposite is composed of polyacrylic acid (PAA) coated upconversion nanoparticles (UCNPs), the surface of which is modified using FA and chlorin e6 (Ce6) functionalized DNA sequences with different lengths...
April 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29780245/protein-delivery-nanosystem-of-six-arm-copolymer-poly-%C3%AE%C2%B5-caprolactone-poly-ethylene-glycol-for-long-term-sustained-release
#7
Jianwei Duan, Chao Liu, Xiaoyu Liang, Xuanling Li, Youlu Chen, Zuoguan Chen, Xiaoli Wang, Deling Kong, Yongjun Li, Jing Yang
Background: To address the issue of delivery of proteins, a six-arm copolymer, six-arm poly (ε-caprolactone)-poly(ethylene glycol) (6S-PCL-PEG), was synthesized by a simple two-step reaction. Thereafter, the application of 6S-PCL-PEG as a protein carrier was evaluated. Materials and methods: A six-arm copolymer, six-arm poly(ε-caprolactone) (6S-PCL), was synthesized by ring-opening polymerization, with stannous octoate as a catalyst and inositol as an initiator...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29779248/analysis-of-intraspecific-seeds-diversity-in-astragalus-aquilanus-fabaceae-endemic-species-of-central-apennine
#8
V Di Cecco, M Di Musciano, A A D'Archivio, A R Frattaroli, L Di Martino
This work aims to study the seeds of the endemic species Astragalus aquilanus from four different populations of Central Italy. We investigated the seed morpho-colorimetric features (shape and size) and chemical differences (through infrared spectroscopy) among populations and between dark and light seeds. Seed morpho-colorimetric quantitative variables, describing shape, size and colour seed traits, were measured using image analysis techniques. Fourier transform infrared (FT-IR) spectroscopy was used to attempt seed chemical characterization...
May 20, 2018: Plant Biology
https://www.readbyqxmd.com/read/29777104/optical-wireless-link-between-a-nanoscale-antenna-and-a-transducing-rectenna
#9
Arindam Dasgupta, Marie-Maxime Mennemanteuil, Mickaël Buret, Nicolas Cazier, Gérard Colas-des-Francs, Alexandre Bouhelier
Initiated as a cable-replacement solution, short-range wireless power transfer has rapidly become ubiquitous in the development of modern high-data throughput networking in centimeter to meter accessibility range. Wireless technology is now penetrating a higher level of system integration for chip-to-chip and on-chip radiofrequency interconnects. However, standard CMOS integrated millimeter-wave antennas have typical size commensurable with the operating wavelength, and are thus an unrealistic solution for downsizing transmitters and receivers to the micrometer and nanometer scale...
May 18, 2018: Nature Communications
https://www.readbyqxmd.com/read/29776916/effect-of-near-infrared-light-therapy-based-on-acupoints-on-the-severity-of-restless-legs-syndrome-in-patients-undergoing-hemodialysis-a-single-blind-randomized-controlled-trial
#10
Mohammad Mehdi Mohammadi, Ali Akbar Vaisi Raygani, Akram Ghobadi, Soheila Samadzadeh, Nader Salari
INTRODUCTION: Restless legs syndrome (RLS) is a common disorder in hemodialysis patients. The present study was conducted to determine the effect of near-infrared (NIR) light therapy given to acupoints on the severity of RLS in patients undergoing hemodialysis. METHODS: This single-blind randomized controlled trial was performed on 60 hemodialysis patients with RLS. Participants who met the inclusion criteria were randomly assigned to an intervention group (n = 30) or a control group (n = 30)...
May 18, 2018: Clinical Medicine & Research
https://www.readbyqxmd.com/read/29775817/janus-graphene-oxide-nanosheet-a-promising-additive-for-enhancement-of-polymeric-membranes-performance-prepared-via-phase-inversion
#11
Mahdi Akbari, Mojtaba Shariaty-Niassar, Takeshi Matsuura, Ahmad Fauzi Ismail
Although polymeric membranes find important role in water and waste water treatment in recent years, their fouling is still an important problem. Application of hydrophilic nanoparticles (NPs) is one of the proposed methods for reducing fouling of membranes but their dispersion and stability in hydrophobic polymer matrix is challenging. In this study Janus functionalization of the NPs was introduced as a promising technique toward achieving this goal. Polysulfone (PSf) membranes containing various concentrations of graphene oxide (GO) nanosheets and Janus graphene oxide (Janus GO) nanosheets (as additives) were fabricated via phase inversion...
May 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29774924/fluorescence-resonance-energy-transfer-fret-based-nanoparticles-composed-of-aie-luminogens-and-nir-dyes-with-enhanced-three-photon-near-infrared-emission-for-in-vivo-brain-angiography
#12
Wen Liu, Yalun Wang, Xiao Han, Ping Lu, Liang Zhu, Chaowei Sun, Jun Qian, Sailing He
Near-infrared (NIR) fluorescence is very important for high-contrast biological imaging of high-scattering tissues such as brain tissue. Unfortunately, commercial NIR dyes are excited usually by visible light, and their multi-photon absorption (MPA) cross-sections are small. Here, we design new co-encapsulated NIR nanoparticles (NPs) with a large three-photon (3PA) absorption cross-section. A form of aggregation-induced emission (AIE) luminogen (AIEgen), 2,3-bis(4'-(diphenylamino)-[1,1'-biphenyl]-4-yl) fumaronitrile (TPATCN), is introduced as the donor, and a form of NIR dye, silicon 2,3-naphthalocyanine bis-(trihexylsilyloxide) (NIR775), is adopted as the acceptor...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29773395/x-ray-powder-diffraction-and-other-analyses-of-cellulose-nanocrystals-obtained-from-corn-straw-by-chemical-treatments
#13
C C Hernandez, F F Ferreira, D S Rosa
The extraction of nanocellulose from agro-industrial wastes is feasible due to a significant amount of cellulose contained in these natural fibers. The analysis of chemical treatments effects on the fibers to obtain the nanocellulose must be taken into consideration for the definition of an adequate and efficient methodology. In this study, two alkaline treatments were used (cleaning and bleaching), as well as an acid treatment for the extraction of nanocellulose from corn straw residues. The samples were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), dynamic light scattering (DLS) and atomic force microscopy (AFM) to verify the action and modifications caused in their chemical and physical structures...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773363/characterization-of-a-fluorescent-hydrogel-synthesized-using-chitosan-polyvinyl-alcohol-and-9-anthraldehyde-for-the-selective-detection-and-discrimination-of-trace-fe-3-and-fe-2-in-water-for-live-cell-imaging
#14
Santu Maity, Nira Parshi, Chandraday Prodhan, Keya Chaudhuri, Jhuma Ganguly
A three-dimensional fluorescent hydrogel based on chitosan, polyvinyl alcohol and 9-anthraldehyde (ChPA) has been successfully designed and synthesized for the selective detection and discrimination of Fe3+ and Fe2+ in aqueous environment. The unique characteristics of ChPA has been confirmed by the Fourier-transform infrared spectroscopy (FTIR), rheological measurement, scanning electron microscopy (SEM), thermogravimetry and differential thermogravimetry (TG-DTG), ultraviolet-visible spectroscopy (UV-vis), fluorescence studies, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD) and dynamic light scattering (DLS)...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29772693/facile-synthesis-of-magnetic-photocatalyst-ag-bivo%C3%A2-mn-1-x-zn-x-fe%C3%A2-o%C3%A2-and-its-highly-visible-light-driven-photocatalytic-activity
#15
Taiping Xie, Hui Li, Chenglun Liu, Longjun Xu
Ag/BiVO₄/Mn1-x Znx Fe₂O₄ was synthesized with a dip-calcination in situ synthesis method. This work was hoped to provide a simple method to synthesis three-phase composite. The phase structure, optical properties and magnetic feature were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS), and vibrating sample magnetometer (VSM)...
May 16, 2018: Materials
https://www.readbyqxmd.com/read/29771749/brillouin-microscopy-assessing-ocular-tissue-biomechanics
#16
Seok Hyun Yun, Dimitri Chernyak
PURPOSE OF REVIEW: Assessment of corneal biomechanics has been an unmet clinical need in ophthalmology for many years. Many researchers and clinicians have identified corneal biomechanics as source of variability in refractive procedures and one of the main factors in keratoconus. However, it has been difficult to accurately characterize corneal biomechanics in patients. The recent development of Brillouin light scattering microscopy heightens the promise of bringing biomechanics into the clinic...
May 15, 2018: Current Opinion in Ophthalmology
https://www.readbyqxmd.com/read/29768838/mesoporous-cds-via-network-of-self-assembled-nanocrystals-synthesis-characterization-and-enhanced-photoconducting-property
#17
Astam K Patra, Biplab Banerjee, Asim Bhaumik
Semiconduction nanoparticles are intensively studied due to their huge potential in optoelctronic applications. Here we report an efficient chemical route for hydrothermal synthesis of aggregated mesoporous cadmium sulfide (CdS) nanoparticles using supramolecular-assembly of ionic and water soluble sodium salicylate as the capping agent. The nanostructure, mesophase, optical property and photoconductivity of these mesoporous CdS materials have been characterized by using small and wide angle powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), N2-sorption, Raman analysis, Fourier transformed infrared (FT-IR), UV-Visible DSR spectroscopy, and photoconductivity measurement...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768242/antibacterial-anticancer-and-antioxidant-potential-of-silver-nanoparticles-engineered-using-trigonella-foenum-graecum-seed-extract
#18
Shivangi Goyal, Nidhi Gupta, Ajeet Kumar, Sreemoyee Chatterjee, Surendra Nimesh
In this study, the authors report a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using Trigonella foenum-graecum (TFG) seed extract. They explored several parameters dictating the biosynthesis of TFG-AgNPs such as reaction time, temperature, concentration of AgNO3 , and TFG extract amount. Physicochemical characterisation of TFG-AgNPs was done on dynamic light scattering (DLS), field emission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768233/biogenic-gold-nanoparticles-for-reduction-of-4-nitrophenol-to-4-aminophenol-an-eco-friendly-bioremediation
#19
Asmathunisha Nabikhan, Suji Rathinam, Kathiresan Kandasamy
The present study investigated the synthesis of gold nanoparticles (AuNPs) using mangrove plant extract from Avicennia marina as bioreductant for eco-friendly bioremediation of 4-nitrophenol (4-NP) . The AuNPs synthesised were confirmed by UV spectrum, transmission electron microscopy (TEM), X-ray diffraction, Fourier transmission infrared spectroscopy (FTIR), dynamic light scattering (DLS), and zeta potential. The AuNPs were found to be spherical in shape with size ranging from 4 to 13 nm, as evident by TEM and DLS...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29767210/low-threshold-lasing-from-colloidal-cdse-cdsete-core-alloyed-crown-type-ii-heteronanoplatelets
#20
Yuan Gao, Mingjie Li, Savas Delikanli, Haiyang Zheng, Baiquan Liu, Cuong Dang, Tze Chien Sum, Hilmi Volkan Demir
Colloidal type-II heterostructures are believed to be a promising solution-processed gain medium given their spatially separated electrons and holes for the suppression of Auger recombination and their wider emission tuning range from the visible to near-infrared region. Amplified spontaneous emission (ASE) was achieved from colloidal type-II core/shell nanocrystals several years ago. However, due to the limited charge-transfer (CT) interfacial states and minimal overlap of electron and hole wave functions, the ASE threshold has still been very high...
May 16, 2018: Nanoscale
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