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https://read.qxmd.com/read/30734559/shape-anisotropic-diblock-copolymer-particles-with-varied-internal-structures
#1
Min Ren, Zhen Geng, Ke Wang, Yi Yang, Zhengping Tan, Jiangping Xu, Lianbin Zhang, Lixiong Zhang, Jintao Zhu
Anisotropic polymer particles have promising applications in various fields, whereas their preparation usually suffers from tedious procedures. Here, we introduce a facile strategy to fabricate novel shape-anisotropic particles with varied internal structures via self-assembly of block copolymers (BCPs) with perfluorooctane (PFO) as liquid template in emulsion droplets. By increasing the volume ratio of PFO to polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) or decreasing the initial concentration of the BCPs, the self-assembled polymer particles change from spherical core-shell structures to anisotropic particles...
February 8, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30716678/a-sensitive-electrochemical-genosensor-for-highly-specific-detection-of-thalassemia-gene
#2
Mohammad-Bagher Gholivand, Arezoo Akbari
Beta thalassemias (βth) are the result of mutations in the β-globin gene. In this report, an electrochemical genosensor was made to detect the sequences anent with the β-globin gene. This biosensor is based on immobilizing 20-mer single stranded oligonucleotide (probe) on the Au nanoparticles- poly (4-aminothiophenol)/ reduced graphene oxide/glassy carbon electrode (AuNPs-PAT/rGO/ GCE) and hybridizing this oligonucleotide along with its complementary sequence (target). The vastness of the probe and target sequences hybridization was studied through differential pulse voltammetry (DPV) along with electrochemical impedance spectroscopy (EIS) using the [Fe(CN)6]3- /4- (1:1) as a hybridization index...
January 15, 2019: Biosensors & Bioelectronics
https://read.qxmd.com/read/30701957/solution-processed-organic-field-effect-transistors-with-high-performance-and-stability-on-paper-substrate
#3
Vivek Raghuwanshi, Deepak Bharti, Ajay Kumar Mahato, Ishan Varun, Shree Prakash Tiwari
High performance operationally stable organic field-effect transistors were successfully fabricated on PowerCoat™ HD 230 paper substrate with TIPS-Pentacene:Polystyrene (PS) blend as active layer and Poly(4-vinylphenol)(PVP)/HfO2 as hybrid gate dielectric. The fabricated devices exhibited excellent p-channel characteristics with maximum and avg. field effect mobility of 0.44 and 0.22(±0.11) cm2 V-1 s-1 respectively, avg. threshold voltage of 0.021(±0.63) and current on-off ratio of ~105 while operating at -10 V...
January 31, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30691309/biocompatible-disulphide-cross-linked-sodium-alginate-derivative-nanoparticles-for-oral-colon-targeted-drug-delivery
#4
Asila Dinie Ayub, Hock Ing Chiu, Siti Nur Aishah Mat Yusuf, Erazuliana Abd Kadir, Siti Hawa Ngalim, Vuanghao Lim
The application of layer-by-layer (LbL) approach on nanoparticle surface coating improves the colon-specific drug delivery of insoluble drugs. Here, we aimed to formulate a self-assembled cysteamine-based disulphide cross-linked sodium alginate with LbL self-assembly to improve the delivery of paclitaxel (PCX) to colonic cancer cells. Cysteamine was conjugated to the backbone of oxidized SA to form a core of self-assembled disulphide cross-linked nanospheres. P3DL was selected for PCX loading and fabricated LbL with poly(allylamine hydrochloride) (PAH) and poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSCMA) resulting from characterization and drug release studies...
December 2019: Artificial Cells, Nanomedicine, and Biotechnology
https://read.qxmd.com/read/30675925/-ru-dcbpy-2dppz-2-fullerene-co-sensitized-ptb7-th-for-ultrasensitive-photoelectrochemical-microrna-assay
#5
Lingying Xia, Yingning Zheng, Wenbin Liang, Mengjie Li, Tao Hu, Ruo Yuan, Yaqin Chai
Here, a novel co-sensitization photoelectrochemical (PEC) strategy was established using a donor-acceptor-type photoactive material poly{4,8-bis[5-(2-ethylhexyl)thiophen-2-yl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl] Thieno[3,4-b]thiophene-4,6-diyl} (PTB7-Th) as signal indicator, which was co-sensitized by bis(4,4'dicarboxyl-2,2'-bipyridyl)(4,5,9,14-tetraaza-benzo[b]triphenylene)ruthenium(II) ([Ru(dcbpy)2dppz]2+) embedded in the grooves of DNA duplex and fullerene (nano-C60) immobilized on the surface of DNA nanoflowers (NFs) for microRNA assay...
January 24, 2019: Chemistry: a European Journal
https://read.qxmd.com/read/30665194/low-energy-loss-polymer-solar-cells-with-14-52-efficiency-enabled-by-wide-band-gap-copolymers
#6
Kui Feng, Jian Yuan, Zhaozhao Bi, Wei Ma, Xiaopeng Xu, Guangjun Zhang, Qiang Peng
Two wide band-gap copolymers poly[4,8-bis(5-(2-butylhexylthio)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-TZNT] (PBDTS-TZNT) and poly[4,8-bis(4-fluoro-5-(2-butylhexylthio)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-TZNT] (PBDTSF-TZNT) based on naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) and benzo[1,2-b:4,5-b']dithiophene (BDT) with different conjugated side chains have been developed for efficient nonfullerene polymer solar cells (NF-PSCs). The rigid planar backbone of BDT and TZNT units imparted high crystallinity and good molecular stacking property to these copolymers...
January 6, 2019: iScience
https://read.qxmd.com/read/30657514/technology-driven-layer-by-layer-assembly-of-a-membrane-for-selective-separation-of-monovalent-anions-and-antifouling
#7
Yan Zhao, Congjie Gao, Bart Van der Bruggen
Selective separation of monovalent anions with reduced fouling is one of the major challenges for anion exchange membranes (AEM) in electrodialysis (ED). In this research, an alternating current layer-by-layer (AC∼LbL) assembly technology was first proposed and then applied to the construction of a durable multilayer with the selective separation of monovalent anions with reduced fouling. Under an alternating current (AC) electric field, the hydrophilic poly(4-styrenesulfonic acid-co-maleic acid) sodium salt and 2-hydroxypropyltrimethyl ammonium chloride chitosan were homogenized and rapidly assembled on a commercial original AEM and then crosslinked using 1,4-bis(2',3'-epoxypropyl) perfluoro-1-butane...
January 18, 2019: Nanoscale
https://read.qxmd.com/read/30641894/nanocellulose-block-copolymer-films-for-the-removal-of-emerging-organic-contaminants-from-aqueous-solutions
#8
Jairo Herrera-Morales, Taylor A Turley, Miguel Betancourt-Ponce, Eduardo Nicolau
The prevalence of emerging organic contaminants (EOCs) in ground and surface water has sparked the search for more effective methods to remove EOCs from the environment. In pursuit of a solution for this environmental concern, herein we present the development of reusable films based on cellulose nanofibers (CNFs) and the block copolymer, poly(4-vinylpyridine-b-ethylene oxide) (P4VP-PEO) to adsorb sulfamethoxazole (SMX) as an EOC model compound. We hypothesize that the adsorption of SMX was achieved mainly by π-π interactions between the pyridine functionalities of the block copolymer and the electron deficient phenyl group of the SMX...
January 11, 2019: Materials
https://read.qxmd.com/read/30615826/block-copolymer-brush-layer-templated-gold-nanoparticles-on-nanofibers-for-surface-enhanced-raman-scattering-optophysiology
#9
Hu Zhu, Félix Lussier, Charles Ducrot, Marie-Josee Bourque, Joachim P Spatz, Wenli Cui, Li Yu, Wei Peng, Louis-Eric Trudeau, C Geraldine Bazuin, Jean-François Masson
A nanothin block copolymer (BCP) brush-layer film adsorbed on glass nanofibers is shown to address the long-standing challenge of forming a template for the deposition of dense and well dispersed nanoparticles on highly curved surfaces, allowing the development of an improved nanosensor for neurotransmitters. We employed a polystyrene-block-poly(4-vinylpyridine) BCP and plasmonic gold nanoparticles (AuNPs) of 52 nm in diameter for the fabrication of the nanosensor on pulled fibers with diameters down to 200 nm...
January 7, 2019: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30614710/effect-of-the-micelle-opening-in-self-assembled-amphiphilic-block-copolymer-films-on-the-infiltration-of-inorganic-precursors
#10
Yunlong She, Jihyung Lee, Byeongdu Lee, Benjamin T Diroll, Thomas Scharf, Elena V Shevchenko, Diana Berman
Infiltration of the polymer templates with inorganic precursors using the selective vapor-phase infiltration approach, or sequential infiltration synthesis (SIS), allows the design of materials with advanced properties. Swelling of the block copolymer (BCP) templates enables the additional control of the structure, porosity, and thickness of the composite or inorganic materials. Here, we use the highly precise quartz crystal microbalance (QCM) technique to investigate quantitatively the effect of the micelle opening by swelling and inorganic precursor infiltrating on the evolution of porosity in amphiphilic BCPs...
January 7, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30605671/rescue-of-transgenic-alzheimer-s-pathophysiology-by-polymeric-cellular-prion-protein-antagonists
#11
Erik C Gunther, Levi M Smith, Mikhail A Kostylev, Timothy O Cox, Adam C Kaufman, Suho Lee, Ewa Folta-Stogniew, George D Maynard, Ji Won Um, Massimiliano Stagi, Jacqueline K Heiss, Austin Stoner, Geoff P Noble, Hideyuki Takahashi, Laura T Haas, John S Schneekloth, Janie Merkel, Christopher Teran, Zaha K Naderi, Surachai Supattapone, Stephen M Strittmatter
Cellular prion protein (PrPC ) binds the scrapie conformation of PrP (PrPSc ) and oligomeric β-amyloid peptide (Aβo) to mediate transmissible spongiform encephalopathy (TSE) and Alzheimer's disease (AD), respectively. We conducted cellular and biochemical screens for compounds blocking PrPC interaction with Aβo. A polymeric degradant of an antibiotic targets Aβo binding sites on PrPC with low nanomolar affinity and prevents Aβo-induced pathophysiology. We then identified a range of negatively charged polymers with specific PrPC affinity in the low to sub-nanomolar range, from both biological (melanin) and synthetic (poly [4-styrenesulfonic acid-co-maleic acid], PSCMA) origin...
January 2, 2019: Cell Reports
https://read.qxmd.com/read/30605617/single-crystal-poly-4-4-4-dihexadecyl-4h-cyclopenta-1-2-b-5-4-b-dithiophen-2-yl-alt-1-2-5-thiadiazolo-3-4-c-pyridine-nanowires-with-ultrahigh-mobility
#12
Yoonkyung Park, Jin Won Jung, Hungu Kang, Jhumur Seth, Youngjong Kang, Myung Mo Sung
We fabricated single-crystal poly[4-(4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b']-dithiophen-2-yl)-alt-[1,2,5]thiadiazolo-[3,4-c]pyridine] (PCDTPT) nanowires with ultrahigh mobility using a liquid-bridge-mediated nanotransfer molding method. The structural analysis of the single-crystal PCDTPT nanowires reveals that PCDTPT crystals have a triclinic structure, and the nanowires grow parallel to PCDTPT backbone chains, which provide important insights into its intrinsic charge transport. The single-crystal PCDTPT nanowire exhibits a superior charge carrier mobility of 72...
January 3, 2019: Nano Letters
https://read.qxmd.com/read/30592400/composition-morphology-correlation-in-ptb7-th-pc71bm-blend-films-for-organic-solar-cells
#13
Lin Song, Weijia Wang, Edoardo Barabino, Dan Yang, Volker Körstgens, Peng Zhang, Stephan V Roth, Peter Muller-Buschbaum
From a morphological perspective the understanding of the influence of the [6,6]-phenyl C71-butyric acid methyl ester (PC71BM) content on the morphology of the active layer is not complete in organic solar cells with bulk heterojunction (BHJ) configuration based on the low-bandgap polymer poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th). In this work, we obtain a highest power conversion efficiency (PCE) of 10...
December 28, 2018: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30582327/strontium-fluoride-and-zinc-oxide-stacked-structure-as-an-interlayer-in-high-performance-inverted-polymer-solar-cells
#14
Shuai Huang, Yu Pang, Xu Li, Yunhe Wang, Ancan Yu, Yuting Tang, Bonan Kang, S Ravi P Silva, Geyu Lu
Enhanced power conversion efficiency (PCE) is reported in inverted polymer solar cells when an ultrathin layer of strontium fluoride (SrF2) is evaporated on the surface of the solution-processed zinc oxide (ZnO) electron transport layer. The photoactive layer is made with bulk heterojunction composites of poly[4,8-bis(5(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b'] dithiopheneco-3-fluorothieno[3,4-b]-thiophene-2-carboxylate] (PTB7-Th) and [6,6]-phenyl-C71- butyric acid methyl ester (PC71BM). The ZnO film acts as an effective electron transport layer, while the ultrathin SrF2 layer improves the energy level alignment and enhances the built-in potential via the formation of an interfacial dipole layer at the interfaces between the ZnO film and the photoactive layer, resulting in an enhanced electron extraction efficiency and a decreased carrier recombination loss...
December 24, 2018: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30569931/a-low-temperature-annealed-and-uv-ozone-enhanced-combustion-derived-nickel-oxide-hole-injection-layer-for-flexible-quantum-dot-light-emitting-diodes
#15
Yizhe Sun, Wei Chen, Yinghui Wu, Zhubing He, Shengdong Zhang, Shuming Chen
Sol-gel derived nickel oxide (NiOx) has been extensively investigated as the hole injection layer (HIL) for many optoelectronic devices because of its advantages of high environmental stability and low cost fabrication. Conventional sol-gel synthesis of NiOx requires high annealing temperature to convert precursors into crystal lattices, which limits its application in flexible devices. To address this issue, a low-temperature (150 °C) combustion method is used to synthesize NiOx. Besides, UV-ozone treatment is further performed to improve the electrical properties of low-temperature-grown NiOx, which leads to the formation of nickel oxyhydroxide (NiO(OH)) surface dipoles and Ni vacancies and thus modifies the energy structure and increases the conductivity of NiOx...
December 20, 2018: Nanoscale
https://read.qxmd.com/read/30565449/solution-processed-double-junction-quantum-dot-light-emitting-diodes-with-eqe-of-over-40
#16
Piaoyang Shen, Fan Cao, Haoran Wang, Bin Wei, Feijiu Wang, Xiao Wei Sun, Xuyong Yang
Despite the fast development made in quantum-dot (QD) light-emitting diodes (QD-LEDs) with single-junction, it remains a big challenge for making tandem QD-LEDs with high-performance. Here, we report solution-processed double-junction tandem QD-LEDs with a high external quantum efficiency of 42.2% and a high current efficiency of 183.3 cd A-1, which are comparable to those of the best vacuum-deposited tandem organic LEDs (OLEDs). Such high-efficiency devices are achieved by interface engineering of fully optimized single light-emitting units which improves carriers transport/injection balance and suppresses exciton quenching induced by ZnO and design of an effective interconnecting layer (ICL) consisting of poly(4-butylphenyl-diphenyl-amine) (poly-TPD) mixed poly(9-vinlycarbazole) (PVK)/PEDOT:PSS/polyethylenimine ethoxylated (PEIE) modified ZnO...
December 19, 2018: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/30544769/supramolecular-modification-of-abc-triblock-terpolymers-in-confinement-assembly
#17
Giada Quintieri, Marco Saccone, Matthias Spengler, Michael Giese, André H Gröschel
The self-assembly of AB diblock copolymers in three-dimensional (3D) soft confinement of nanoemulsions has recently become an attractive bottom up route to prepare colloids with controlled inner morphologies. In that regard, ABC triblock terpolymers show a more complex morphological behavior and could thus give access to extensive libraries of multicompartment microparticles. However, knowledge about their self-assembly in confinement is very limited thus far. Here, we investigated the confinement assembly of polystyrene- block -poly(4-vinylpyridine)- block -poly( tert -butyl methacrylate) (PS- b -P4VP- b -PT or SVT) triblock terpolymers in nanoemulsion droplets...
December 10, 2018: Nanomaterials
https://read.qxmd.com/read/30522414/hollow-s-nitrosothiols-nanoparticle-with-polymeric-brushes-for-nitric-oxide-no-releasing-as-tumor-targeted-chemotherapy
#18
Jilan Wang, Ye Bi, Hongyan Ruan, Guoqing Sun, Xianping Cui, Xinlin Yang, Chengkun Qin
A kind of tumor targeting nitric oxide donor nanoparticle with brushes is described in this paper. The poly(4-vinylphenylboronic acid) polymeric brush, which shows glucose and pH dual responsiveness, endows the ability of hollow S-nitrosothiols nanoparticle to accurate recognition and binding with the sialic acid over-expressed type tumor cells, such as HepG2 and MCF-7 cells. In vitro experiments, including cells capture and release experiments, confocal fluorescence microscope characterization, cytotoxicity assay with different cells, demonstrate the selective recognition and the controlled NO release to kill tumor cells for these S-nitrosothiols nanoparticles...
December 6, 2018: Journal of Biomaterials Science. Polymer Edition
https://read.qxmd.com/read/30507203/kinetically-controlled-self-assembly-of-block-copolymers-into-segmented-worm-like-micelles-in-microfluidic-chips
#19
Zhengping Tan, Wei Lan, Qianqian Liu, Ke Wang, Mubashir Hussain, Min Ren, Zhen Geng, Lianbin Zhang, Xiaobing Luo, Lixiong Zhang, Jintao Zhu
Kinetically controlled self-assembly of block copolymers (BCPs) in solution is an efficient route to fabricate complex hierarchical colloids which are of great importance for nanoencapsulation, microreactors, and biomimics. Herein, segmented worm-like micelles (SWMs) with controllable size are generated by self-assembly of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) in microfluidic channel. Different from the assembly of BCPs off-chip at the same solution properties, it is found that the fabricated SWMs are kinetically controlled assemblies with thermodynamic metastable structures, which are formed by orderly aggregation of preformed spherical micelles due to fast mixing process in microfluidic channels...
December 3, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/30472622/immobilization-of-functional-polymers-on-poly-4-benzoyl-pxylylene-co-p-xylylene-films-via-photochemical-conjugation-for-modulation-of-cell-adhesion
#20
Ibrahim Nasser Ahmed, Ray Chang, Ming-Chun Keng, Hsiu-Wen Chien, Hsien-Yeh Chen, Wei-Bor Tsai
Surface modification with functional materials, such as anti-fouling or thermal responsive polymers, on biomedical devices benefits their clinical performance. Simple and versatile technologies, which could be applied to a wide variety of substrates, are still highly desirable. Chemical vapor deposition (CVD) of 4-benzoyl-[2,2]paracyclophane (Benzoyl-PPX) layers attracts much attention because the photoreactive platform could be deposited onto almost every substrate for the conjugation of functional molecules...
November 11, 2018: Colloids and Surfaces. B, Biointerfaces
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