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https://read.qxmd.com/read/30774337/a-highly-sensitive-biosensor-based-on-au-nps-rgo-pamam-fc-nanomaterials-for-detection-of-cholesterol
#1
Jianmeng Zhu, Zhilu Ye, Xiaoying Fan, Hongqin Wang, Zhen Wang, Bingyu Chen
Objective: This study aimed to construct a biosensor using Au nanoparticles (Au NPs) and reduced graphene-polyamide-amine-ferrocene (rGO-PAMAM-Fc) nanomaterials designed for rapid and sensitive detection of cholesterol. Materials and methods: In this study, a highly sensitive biosensor based on Au NPs/ rGO-PAMAM-Fc nanomaterials was manufactured for detection of cholesterol. The rGO-PAMAM-Fc and Au NPs were modified on the surface of the electrode and then coated with cholesterol oxidase (ChOx) and cholesterol esterase (ChEt) to develop the ChOx&ChEt/Au NPs/rGO-PAMAM-Fc biosensor...
2019: International Journal of Nanomedicine
https://read.qxmd.com/read/30771970/screening-of-extraction-properties-of-nanofibers-in-a-sequential-injection-analysis-system-using-a-3d-printed-device
#2
Ivana H Šrámková, Laura Carbonell-Rozas, Burkhard Horstkotte, Martina Háková, Jakub Erben, Jiří Chvojka, František Švec, Petr Solich, Ana M García-Campaña, Dalibor Šatínský
A novel application of the three-dimensional printing technology for the automation of solid phase extraction procedures in a low-pressure sequential injection analysis system is presented. A 3D printed device was used as a housing for nanofiber membranes in solid phase extraction. The applicability of the device is demonstrated with the extraction of substances of various physical-chemical properties. Pharmaceuticals including non-steroidal anti-inflammatory drugs, antihistaminics, and steroidal structures, as well as emerging pollutants such as bisphenols and pesticide metsulfuron methyl were used as model analytes to study the extraction performance of the nanofibers...
May 15, 2019: Talanta
https://read.qxmd.com/read/30771707/thin-film-nanocomposite-hollow-fiber-membranes-comprising-na-functionalized-carbon-quantum-dots-for-brackish-water-desalination
#3
Wenxiao Gai, Die Ling Zhao, Tai-Shung Chung
We have incorporated Na+ -functionalized carbon quantum dots (Na-CQDs) into the polyamide layer via interfacial polymerization reaction and developed novel thin film nanocomposite (TFN) hollow fiber membranes for brackish water desalination. Comparing with the conventional thin film composite (TFC) membranes, the TFN membranes comprising Na-CQDs have a larger effective surface area, thinner polyamide layer and more hydrophilic oxygen-containing groups in the polyamide layer. Besides, the interstitial space among the polyamide chains becomes larger due to the presence of Na-CQDs...
February 4, 2019: Water Research
https://read.qxmd.com/read/30764474/reactive-compatibilization-of-pla-pa11-blends-and-their-application-in-additive-manufacturing
#4
Damien Rasselet, Anne-Sophie Caro-Bretelle, Aurélie Taguet, José-Marie Lopez-Cuesta
The aim of this work was to study the properties of polylatic acid/polyamide 11 (PLA/PA11) blends compatibilized with a multifunctionalized epoxide, Joncryl® , and to evaluate the performance of such blends processed by Fused Deposition Modeling (FDM) 3D printing, compared to those produced by injection molding method. Blends containing different Joncryl contents from 0.5 to 3 wt% were prepared by twin-screw extrusion. Evaluation of thermal, rheological and mechanical properties of such blends proved that Joncryl acted as a compatibilizer...
February 5, 2019: Materials
https://read.qxmd.com/read/30760728/photo-polymerization-as-a-new-approach-to-fabricate-the-active-layer-of-forward-osmosis-membrane
#5
Pankaj M Pardeshi, Alka A Mungray
A novel approach is employed to prepare the active layer of the forward osmosis membrane by the photo-polymerization method. The poly (ethylene glycol) phenyl ether acrylate (PPEA) and methacrylic acid (MAA) are used as monomers. The emphasis is given to analysing the effect of monomer concentration on chemical functional groups of active layer, thermal stability, surface morphology, roughness, interfacial free energy, organic fouling tendency and osmotic flux performance. The functional groups of the active layer are characterized by ATR-FTIR...
February 13, 2019: Scientific Reports
https://read.qxmd.com/read/30755621/facile-fabrication-of-size-tunable-core-shell-ferroelectric-polymeric-nanoparticles-with-tailorable-dielectric-properties-via-organocatalyzed-atom-transfer-radical-polymerization-driven-by-visible-light
#6
Ning You, Chenxi Zhang, Yachao Liang, Qi Zhang, Peng Fu, Minying Liu, Qingxiang Zhao, Zhe Cui, Xinchang Pang
An unconventional but facile approach to prepare size-tunable core/shell ferroelectric/polymeric nanoparticles with uniform distribution is achieved by metal-free atom transfer radical polymerization (ATRP) driven by visible light under ambient temperature based on novel hyperbranched aromatic polyamides (HBPA) as a functional matrix. Cubic BaTiO3 /HBPA nanocomposites can be prepared by in-situ polycondensation process with precursors (barium hydroxide (Ba(OH)2 ) and titanium(IV) tetraisopropoxide (TTIP)) of ferroelectric BaTiO3 nanocrystals, because precursors can be selectively loaded into the domain containing the benzimidazole rings...
February 12, 2019: Scientific Reports
https://read.qxmd.com/read/30742856/therapeutic-gene-regulation-using-pyrrole-imidazole-polyamides
#7
Zutao Yu, Ganesh N Pandian, Takuya Hidaka, Hiroshi Sugiyama
Recent innovations in cutting-edge sequencing platforms have allowed the rapid identification of genes associated with communicable, noncommunicable and rare diseases. Exploitation of this collected biological information has facilitated the development of nonviral gene therapy strategies and the design of several proteins capable of editing specific DNA sequences for disease control. Small molecule-based targeted therapeutic approaches have gained increasing attention because of their suggested clinical benefits, ease of control and lower costs...
February 8, 2019: Advanced Drug Delivery Reviews
https://read.qxmd.com/read/30742424/non-polyamide-based-nanofiltration-membranes-using-green-metal-organic-coordination-complexes-implications-for-the-removal-of-trace-organic-contaminants
#8
Hao Guo, Lu Elfa Peng, Zhikan Yao, Zhe Yang, Xiaohua Ma, Chuyang Y Tang
Polyamide-based thin film composite (TFC) membranes are generally optimized for salt rejection but not for the removal of trace organic contaminants (TrOCs). The insufficient rejection of TrOCs such as endocrine disrupting compounds (EDCs) by polyamide membranes can jeopardize product water safety in wastewater reclamation. In this study, we report a novel non-polyamide membrane chemistry using green tannic acid-iron (TA-Fe) complexes to remove TrOCs. The nanofiltration membrane formed at a TA-Fe molar ratio of 1:3 (TA-Fe3) had a continuous thin rejection layer of 10-30 nm in thickness, together with a water permeability of 5...
February 11, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30718690/enhancing-morphology-and-separation-performance-of-polyamide-6-6-membranes-by-minimal-incorporation-of-silver-decorated-graphene-oxide-nanoparticles
#9
Ebrahim Mahmoudi, Law Yong Ng, Wei Lun Ang, Ying Tao Chung, Rosiah Rohani, Abdul Wahab Mohammad
Nanomaterials can be incorporated in the synthesis of membrane to obtain mixed-matrix membrane with marked improvement in properties and performance. However, stability and dispersion of the nanomaterials in the membrane matrix, as well as the need to use high ratio of nanomaterials for obvious improvement of membrane properties, remain a major hurdle for commercialization. Hence, this study aims to investigate the improvement of polyamide 6,6 membrane properties with the incorporation of silver nanoparticles decorated on graphene oxide (Ag-GO) nanoplates and at the same time focus is given to the issues above...
February 4, 2019: Scientific Reports
https://read.qxmd.com/read/30717388/thermoplastic-reaction-injection-pultrusion-for-continuous-glass-fiber-reinforced-polyamide-6-composites
#10
Ke Chen, Mingyin Jia, Hua Sun, Ping Xue
In this paper, glass fiber-reinforced polyamide-6 (PA-6) composites with up to 70 wt% fiber contents were successfully manufactured using a pultrusion process, utilizing the anionic polymerization of caprolactam (a monomer of PA-6). A novel thermoplastic reaction injection pultrusion test line was developed with a specifically designed injection chamber to achieve complete impregnation of fiber bundles and high speed pultrusion. Process parameters like temperature of injection chamber, temperature of pultrusion die, and pultrusion speed were studied and optimized...
February 2, 2019: Materials
https://read.qxmd.com/read/30711637/chlorine-resistant-sulfochlorinated-and-sulfonated-polysulfone-for-reverse-osmosis-membranes-by-coating-method
#11
Yali Zhao, Lei Dai, Qifeng Zhang, Shengyang Zhou, Suobo Zhang
In this work, sulfochlorinated polysulfone (SC-PSf), a functional polysulfone with chlorine resistance, was synthesized through metalation sulfochlorination of polysulfone (PSf). For endowing the required hydrophilicity of SC-PSf, the sulfonyl chloride groups on SC-PSf were partially hydrolyzed to sulfonic groups to produce sulfonated SC-PSf (SC-S-PSf). Thin film composite (TFC) membranes for reverse osmosis application were fabricated by coating solution of SC-S-PSf on porous PSf substrate and then crosslinked by piperazine (PIP) to form polysulfone-sulfamide (PSSA) skin layer...
January 25, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30711296/a-study-of-the-flexural-strength-and-surface-hardness-of-different-materials-and-technologies-for-occlusal-device-fabrication
#12
Vladimir Prpic, Ivan Slacanin, Zdravko Schauperl, Amir Catic, Niksa Dulcic, Samir Cimic
STATEMENT OF PROBLEM: With the emergence of digital technologies, new materials have become available for occlusal devices. However, data are scarce about these different materials and technologies and their mechanical properties. PURPOSE: The purpose of this in vitro study was to investigate the flexural strength and surface hardness of different materials using different technologies for occlusal device fabrication, with an emphasis on the digital technologies of computer-aided design and computer-aided manufacturing (CAD-CAM) and 3D printing...
January 30, 2019: Journal of Prosthetic Dentistry
https://read.qxmd.com/read/30708252/design-of-functional-textile-coatings-via-non-conventional-electrofluidodynamic-processes
#13
Francesca De Falco, Vincenzo Guarino, Gennaro Gentile, Mariacristina Cocca, Veronica Ambrogi, Luigi Ambrosio, Maurizio Avella
HYPOTHESIS: In the last years, several cost-effective technologies have been investigated to functionalize textile substrates for large scale applications and industrial production. However, several limitations of currently used technologies still restrict the capability to form functional coatings finely controlling the textile surface properties and topographic structure of the coatings at sub-micrometric scale. EXPERIMENTS: Herein, we introduced a new non-conventional electrofluidodynamic technology - based on the use of electrostatic forces to polymer/composite solutions - for the application onto textile fabrics of functional coatings...
January 22, 2019: Journal of Colloid and Interface Science
https://read.qxmd.com/read/30707583/degradation-of-polyamide-membranes-exposed-to-chlorine-an-impedance-spectroscopy-study
#14
Mikhail Stolov, Viatcheslav Freger
Polyamide is the key material in modern membrane desalination, however, its well-known and incompletely understood drawback is low tolerance of chlorine, the most efficient inline disinfectant. Here we report a first investigation of the mechanism and kinetics of chlorine attack using electrochemical impedance spectroscopy (EIS) that directly probes changes in ion permeation upon chlorination at different pH, focusing on its early stages and low chlorine concentrations (15 to 197 ppm). EIS results partly conform to established two-stage mechanism that proceeds as N-chlorination followed by either C-chlorination in acidic conditions or amide bond scission in alkaline conditions...
February 1, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30704930/influence-of-block-out-on-retentive-force-of-thermoplastic-resin-clasps-an-in-vitro-experimental-and-finite-element-analysis
#15
Toshiki Yamazaki, Natsuko Murakami, Shizuka Suzuki, Kazuyuki Handa, Masaru Yatabe, Hidekazu Takahashi, Noriyuki Wakabayashi
PURPOSE: The purpose of this study was to determine the effect of block-out preparation, used to eliminate the undercut area, on the retentive force and stress distribution of resin clasps. METHODS: A total of 72 polyester and polyamide resin clasps were fabricated on a premolar abutment crown following six block-out preparations. A combination of two types of vertical block-outs and three types of horizontal block-outs (on the missing side) was used on the abutment tooth...
January 28, 2019: Journal of Prosthodontic Research
https://read.qxmd.com/read/30689962/a-new-orbito-zygomatic-complex-reconstruction-technique-using-computer-aided-design-and-manufacturing-assisted-harvest-of-autologous-calvarial-bone-in-cases-of-orbito-zygomatic-benign-tumor
#16
Romain Nicot, Matthias Schlund, Camille Sentucq, Gwénaël Raoul
The orbito-zygomatic complex (OZC) includes several key structures, and its destruction leads to the impairment of functional activities such as nutrition, communication, nasal support, and vision. Management of benign tumors of the OZC is therefore a surgical challenge because of the necessity for reconstruction of these elements. Autogenous bone is considered the gold standard for reconstruction. Nevertheless, there is difficulty related to the complex anatomy and distorted skeletal anatomic landmarks, which require precise work in the case of bone grafts...
December 31, 2018: Journal of Oral and Maxillofacial Surgery
https://read.qxmd.com/read/30688437/effects-of-particle-properties-on-the-settling-and-rise-velocities-of-microplastics-in-freshwater-under-laboratory-conditions
#17
Kryss Waldschläger, Holger Schüttrumpf
Microplastic (MP) contaminates terrestrial, aquatic and atmospheric environments. Although the number of river sampling studies with regard to MP concentrations is increasing, comprehension of the predominant transport processes of MP in the watercourse is still very limited. In order to gain a better process understanding, around 500 physical experiments are conducted to shed more light on the effects of particle shape, size and density on the rise and settling velocities of MP. The determined velocities ranged between 0...
January 28, 2019: Environmental Science & Technology
https://read.qxmd.com/read/30687984/graphynes-for-water-desalination-and-gas-separation
#18
REVIEW
Hu Qiu, Minmin Xue, Chun Shen, Zhuhua Zhang, Wanlin Guo
Selective transport of mass through membranes, so-called separation, is fundamental to many industrial applications, e.g., water desalination and gas separation. Graphynes, graphene analogs yet containing intrinsic uniformly distributed pores, are excellent candidates for highly permeable and selective membranes owing to their extreme thinness and high porosity. Graphynes exhibit computationally determined separation performance far beyond experimentally measured values of commercial state-of-the-art polyamide membranes; they also offer advantages over other atomically thin membranes like porous graphene in terms of controllability in pore geometry...
January 28, 2019: Advanced Materials
https://read.qxmd.com/read/30686421/sinking-velocity-of-sub-millimeter-microplastic
#19
David Kaiser, Arne Estelmann, Nicole Kowalski, Michael Glockzin, Joanna J Waniek
Sinking experiments were conducted using irregularly shaped polyamide (PA), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET) particles sized 6 to 251 μm. Certified PS spheres were used to validate experiments and showed that the effect of particle size on terminal sinking velocity is well reproduced by the method. As expected sinking velocities of irregularly shaped particles were considerably lower than theoretical values for spheres of the same size range calculated via several approximations available in the literature...
February 2019: Marine Pollution Bulletin
https://read.qxmd.com/read/30681694/antiplatelet-aggregation-and-antithrombotic-benefits-of-terpenes-and-flavones-from-hawthorn-leaf-extract-isolated-using-the-activity-guided-method
#20
Pinyi Gao, Shuangshuang Li, Kechun Liu, Chen Sun, Shaojiang Song, Lingzhi Li
Hawthorn is a well-known functional food; at present, increasing attention has been given to hawthorn leaf due to its numerous functional and nutritional properties. In this study, the antithrombotic properties of hawthorn leaves were evaluated using the activity-guided isolation process and high-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (HPLC-QTOF-MS). A crude extract prepared in 75% ethanol was fractionated using macroporous resin D101 and polyamide chromatography to obtain three active fractions (Fr...
January 25, 2019: Food & Function
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