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https://www.readbyqxmd.com/read/28806653/novel-microemulsion-based-gels-for-topical-delivery-of-indomethacin-formulation-physicochemical-properties-and-in-vitro-drug-release-studies
#1
Anna Froelich, Tomasz Osmałek, Agnieszka Snela, Paweł Kunstman, Barbara Jadach, Marta Olejniczak, Grzegorz Roszak, Wojciech Białas
HYPOTHESIS: Microemulsion-based semisolid systems may be considered as an interesting alternative to the traditional dosage forms applied in topical drug delivery. Mechanical properties of topical products are important both in terms of application and dosage form effectiveness. In this study we designed and evaluated novel microemulsion-based gels with indomethacin and analyzed the factors affecting their mechanical characteristics and drug release. EXPERIMENTS: The impact of the microemulsion composition on the extent of isotropic region was investigated with the use of pseudoternary phase diagrams...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806516/scalable-and-facile-preparation-of-highly-stretchable-electrospun-pedot-pss-pu-fibrous-nonwovens-towards-wearable-conductive-textile-applications
#2
Yichun Ding, Wenhui Xu, Wenyu Wang, Hao Fong, Zhengtao Zhu
Flexible and stretchable conductive textiles are highly desired for potential applications in wearable electronics. This study demonstrates a scalable and facile preparation of all-organic nonwoven that is mechanically stretchable and electrically conductive. Polyurethane (PU) fibrous nonwoven is prepared via the electrospinning technique; in the following step, the electrospun PU nonwoven is dip-coated with the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). This simple method enables convenient preparation of PEDOT:PSS@PU nonwovens with initial sheet resistance in the range of 35~240 Ω/ sq (i...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805728/nano-charged-polypropylene-application-realistic-perspectives-for-enhancing-durability
#3
Carlo Naddeo, Luigi Vertuccio, Giuseppina Barra, Liberata Guadagno
Isotactic polypropylene/multi-walled carbon nanotube (iPP/MWCNTs) films have been exposed to accelerated weathering in a UV device for increasing times. The effect of UV irradiation on the structural and chemical changes has been investigated. The resistance to accelerated photooxidation of (iPP/MWCNTs) films has been compared to the photooxidation behaviour of unfilled polypropylene films with the same structural organization. The chemical and structural modifications resulting from photooxidation have been followed using infrared spectroscopy, calorimetric and diffractometric analysis...
August 14, 2017: Materials
https://www.readbyqxmd.com/read/28805651/electrodeposition-of-vertically-standing-ag-nanoplates-and-nanowires-on-transparent-conductive-electrode-using-porous-anodic-aluminum-oxide-membrane
#4
Jue Wang, Shanlin Pan
We report fabricating vertically standing Ag nanoplates and nanowires on top of a transparent conductive substrate of indium tin oxides (ITO) with the assistance of porous anodic aluminum oxide (AAO) membrane. Two-dimensional Ag nanoplates are electrodeposited onto ITO surface which is covered with an AAO membrane without using an adhesion layer. Ag nanoplates obtained using AAO membranes majorly present 3×{222} superlattice fringes, different from the 3×{422} superlattice fringes reported in the previous study...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28805467/protective-microencapsulation-of-%C3%AE-lapachone-using-porous-glass-membrane-technique-based-on-experimental-optimization
#5
Ki Hyun Kim, Tuan-Ho Le, Hee Kyung Oh, Bora Heo, Jeonghyun Moon, Sangmun Shin, Seong Hoon Jeong
Even though β-lapachone is a novel drug with pharmacological activity, it has limitations including instability under light conditions. The main purpose of the study was to enhance the stability of β-lapachone using the microencapsulation method. The Shirasu porous glass membrane was used to achieve uniform-sized microcapsules. The prepared microcapsules were evaluated to investigate how process parameters affect the encapsulation efficiency, photostability, and particle size distribution. The experimental design was conducted to obtain optimal formulations...
August 14, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28805056/polymer-dehalogenation-enabled-fast-fabrication-of-n-s-codoped-carbon-materials-for-superior-supercapacitor-and-deionization-applications
#6
Yingna Chang, Guoxin Zhang, Biao Han, Haoyuan Li, Cejun Hu, Yingchun Pang, Zheng Chang, Xiaoming Sun
Doped carbon materials (DCM) with multiple heteroatoms hold broad interests in electrochemical catalysis and energy storage but require several steps to fabricate, which greatly hinder their practical applications. In this study, a facile strategy is developed to enable the fast fabrication of multiply doped carbon materials via room-temperature dehalogenation of polyvinyl dichloride (PVDC) promoted by KOH with the presence of different organic dopants. A N, S-codoped carbon material (NS-DCM) is demonstratively synthesized using two dopants (dimethylformamide for N doping and dimethylsulfoxide for S doping)...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805046/electroenhanced-antimicrobial-coating-based-on-conjugated-polymers-with-covalently-coupled-silver-nanoparticles-prevents-staphylococcus-aureus-biofilm-formation
#7
Salvador Gomez-Carretero, Rolf Nybom, Agneta Richter-Dahlfors
The incidence of hospital-acquired infections is to a large extent due to device-associated infections. Bacterial attachment and biofilm formation on surfaces of medical devices often act as seeding points of infection. To prevent such infections, coatings based on silver nanoparticles (AgNPs) are often applied, however with varying clinical success. Here, the traditional AgNP-based antibacterial technology is reimagined, now forming the base for an electroenhanced antimicrobial coating. To integrate AgNPs in an electrically conducting polymer layer, a simple, yet effective chemical strategy based on poly(hydroxymethyl 3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT-MeOH:PSS) and (3-aminopropyl)triethoxysilane is designed...
August 14, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28804996/in-vitro-evaluation-of-3d-bioprinted-tri-polymer-network-scaffolds-for-bone-tissue-regeneration
#8
Stephanie T Bendtsen, Mei Wei
In vitro evaluations provide vital information on the ability of tissue engineered scaffolds to support cell life and promote natural physiological behaviors in culture. Such assessments are necessary to conduct before implementation of the scaffolds for tissue healing in vivo. The scaffold extracellular matrix must provide the biochemical and mechanical cues necessary to promote cellular attachment, migration and proliferation before differentiation and new tissue deposition can occur. In this study, an in vitro evaluation was conducted to assess the ability of scaffolds 3D printed with a previously developed alginate-polyvinyl alcohol-hydroxyapatite formulation to promote proliferation of encapsulated MC3T3 cells...
August 14, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28804684/bioresorbable-scaffold-as-a-dermal-substitute
#9
Lenon Cardoso, Marília Colturato Cleto, Maria Lourdes Peris Barbo, Andréa Rodrigues Esposito, Flavio Stillitano Orgaes, Eliana Aparecida de Rezende Duek
INTRODUCTION: Bioresorbable polymers are often used in medical procedures. Since they are biocompatible, this class of materials is a viable alternative for cases in which tissue regeneration is strongly compromised. Bioresorbable synthetic polymers may be used as membranes to support and guide cell growth through the process of tissue repair. OBJECTIVE: To assess the efficiency of a porous bioresorbable membrane Poly (L-co-DL lactic acid)-co-trimethylene carbonate, PL-co-DLA-co-TMC, as a dermal substitute associated with partial skin graft in rats...
2017: International Journal of Burns and Trauma
https://www.readbyqxmd.com/read/28802101/flexible-biodegradable-citrate-based-polymeric-step-index-optical-fiber
#10
Dingying Shan, Chenji Zhang, Surge Kalaba, Nikhil Mehta, Gloria B Kim, Zhiwen Liu, Jian Yang
Implanting fiber optical waveguides into tissue or organs for light delivery and collection is among the most effective ways to overcome the issue of tissue turbidity, a long-standing obstacle for biomedical optical technologies. Here, we report a citrate-based material platform with engineerable opto-mechano-biological properties and demonstrate a new type of biodegradable, biocompatible, and low-loss step-index optical fiber for organ-scale light delivery and collection. By leveraging the rich designability and processibility of citrate-based biodegradable polymers, two exemplary biodegradable elastomers with a fine refractive index difference and yet matched mechanical properties and biodegradation profiles were developed...
August 4, 2017: Biomaterials
https://www.readbyqxmd.com/read/28802011/evaluation-of-poly-2-acryloyloxy-ethyl-trimethylammonium-chloride-cationic-polymer-capillary-coating-for-capillary-electrophoresis-and-electrokinetic-chromatography-separations
#11
Julie R McGettrick, Christopher P Palmer
Capillary electrophoresis and electrokinetic chromatography are typically carried out in unmodified fused silica capillaries under conditions that result in a strong negative zeta potential at the capillary wall and a robust cathodic electroosmotic flow. Modification of the capillary wall to reverse the zeta potential and mask silanol sites can improve separation performance by reducing or eliminating analyte adsorption, and is essential when conducting electrokinetic chromatography separations with cationic latex nanoparticle pseudo-stationary phases...
August 12, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28800216/cross-stacking-of-nanopatterned-pedot-films-for-use-as-soft-electrodes
#12
Chihyun Park, Jongbeom Na, Eunkyoung Kim
Cross stacking of nanopatterned conductive polymer film was explored using a sacrificial soft template made of nanopatterned polystyrene (PS) film as a guide for nanopatterned conductive polymer film. For use as a conductive film, the PS pattern was filled with poly(3,4-ethylenedioxythiophene) (PEDOT), and then completely removed, to generate single-patterned PEDOT (SPDOT) film having a conductivity of 1079 S/cm, which was comparable to the pristine unpatterned PEDOT (UPDOT) film on a glass slide. SPDOT layers were stacked across each other to form double-layered (DPDOT) and multiple-layered patterned PEDOT film on a glass slide or polymeric substrate...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28800098/porous-graphene-oxide-prepared-on-nickel-foam-by-electrophoretic-deposition-and-thermal-reduction-as-high-performance-supercapacitor-electrodes
#13
Yunhe Xu, Jun Li, Wenxin Huang
A simple electrophoretic deposition method was developed to prepare graphene oxide (GO) films on the frameworks of nickel foam without any conductive agents and polymer binders. Then, GO was transformed into thermally-reduced graphene oxide (RGO) at an appropriate temperature. The effects of deposition voltage and thermal reduction temperature on the electrochemical properties of RGO were investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge. The appropriate combination of deposition voltage and thermal reduction temperature was established...
August 11, 2017: Materials
https://www.readbyqxmd.com/read/28798958/biofunctionalized-conductive-polymers-enable-efficient-co2-electroreduction
#14
Halime Coskun, Abdalaziz Aljabour, Phil De Luna, Dominik Farka, Theresia Greunz, David Stifter, Mahmut Kus, Xueli Zheng, Min Liu, Achim W Hassel, Wolfgang Schöfberger, Edward H Sargent, Niyazi Serdar Sariciftci, Philipp Stadler
Selective electrocatalysts are urgently needed for carbon dioxide (CO2) reduction to replace fossil fuels with renewable fuels, thereby closing the carbon cycle. To date, noble metals have achieved the best performance in energy yield and faradaic efficiency and have recently reached impressive electrical-to-chemical power conversion efficiencies. However, the scarcity of precious metals makes the search for scalable, metal-free, CO2 reduction reaction (CO2RR) catalysts all the more important. We report an all-organic, that is, metal-free, electrocatalyst that achieves impressive performance comparable to that of best-in-class Ag electrocatalysts...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28798914/rapid-characterization-of-bacterial-electrogenicity-using-a-single-sheet-paper-based-electrofluidic-array
#15
Yang Gao, Daniel J Hassett, Seokheun Choi
Electrogenicity, or bacterial electron transfer capacity, is an important application which offers environmentally sustainable advances in the fields of biofuels, wastewater treatment, bioremediation, desalination, and biosensing. Significant boosts in this technology can be achieved with the growth of synthetic biology that manipulates microbial electron transfer pathways, thereby potentially significantly improving their electrogenic potential. There is currently a need for a high-throughput, rapid, and highly sensitive test array to evaluate the electrogenic properties of newly discovered and/or genetically engineered bacterial species...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28796918/hydrogel-carbon-nanotubes-needle-free-device-for-electrostimulated-skin-delivery
#16
Jean-François Guillet, Emmanuel Flahaut, Muriel Golzio
The permeability of skin allows passive diffusion across the epidermis to reach blood vessels but this is possible only for small molecules such as nicotine. In order to achieve transdermal delivery of large molecules such as insulin or plasmid DNA, permeability of the skin and mainly the permeability of stratum corneum has to be increased. Moreover, alternative routes that avoid the use of needles will improve the quality of life of patients. A method named "electropermeabilization" has been shown to increase skin permeability...
August 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28794493/structural-and-thermal-stability-of-polycarbonate-decorated-fumed-silica-nanocomposite-via-thermomechanical-analysis-and-in-situ-temperature-assisted-saxs
#17
Ramdayal Yadav, Minoo Naebe, Xungai Wang, Balasubramanian Kandasubramanian
The inorganic and organic nanocomposites have enticed wide interest in the field of polymer-based composite systems to augment their physiochemical properties like mechanical strength and electrical conductivity. Achieving interfacial interaction between inorganic filler and polymer matrix is a recurring challenge, which has significant implications for mechanical properties of nanocomposites. In this context, the effect of "interfacial zone" on structural and thermal attributes of the melt blended pristine polycarbonate and polycarbonate (PC) decorated fumed silica nanocomposite have been examined from ambient temperature to the glass transition temperature...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28794001/randomized-comparison-of-ridaforolimus-eluting-and-zotarolimus-eluting-coronary-stents-in-patients-with-coronary-artery-disease-primary-results-from-the-bionics-trial
#18
David E Kandzari, Pieter C Smits, Michael P Love, Ori Ben-Yehuda, Shmuel Banai, Simon D Robinson, Michael Jonas, Ran Kornowski, Rodrigo Bagur, Andres Iniguez, Haim D Danenberg, Robert L Feldman, Rajiv Jauhar, Harish Chandna, Manish A Parikh, Gidon Y Perlman, Mercedes Balcells, Peter M Markham, Melek Ozgu Ozan, Philippe Genereux, Elazer Edelman, Martin B Leon, Gregg W Stone
Background -The safety and efficacy of a novel cobalt alloy-based coronary stent with a durable elastomeric polymer eluting the antiproliferative agent ridaforolimus for treatment of patients with coronary artery disease is undetermined. Methods -A prospective, international 1:1 randomized trial was conducted to evaluate in a noninferiority design the relative safety and efficacy of ridaforolimus-eluting stents (RES) and slow-release zotarolimus-eluting stents (ZES) among 1,919 patients at 76 centers undergoing percutaneous coronary intervention...
August 9, 2017: Circulation
https://www.readbyqxmd.com/read/28792204/poly-vinylidene-fluoride-flexible-nanocomposite-films-with-dopamine-coated-giant-dielectric-ceramic-nanopowders-ba-fe0-5ta0-5-o3-for-high-energy-storage-density-at-low-electric-field
#19
Zhuo Wang, Tian Wang, Chun Wang, Yujia Xiao, Panpan Jing, Yongfei Cui, Yongping Pu
Ba(Fe0.5Ta0.5)O3/poly(vinylidene fluoride) (BFT/PVDF) flexible nanocomposite films are fabricated by tape-casting using dopamine (DA) modified BFT nanopowders and PVDF as matrix polymer. After surface modification by DA layer with a thickness of 5 nm, the interfacial couple interaction between BFT and PVDF is enhanced, resulting in less hole defects at the interface. Then the dielectric constant ('), loss tangent (tan δ) and AC conductivity of nanocomposite films are reduced. Meanwhile, the value of reduced dielectric constant (Δ') and strength of interfacial polarization (k) is introduced to illustrate the effect of DA on dielectric behavior of nanocomposite films...
August 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28792203/significant-enhancement-of-thermal-conductivity-in-polymer-composite-via-constructing-macroscopic-segregated-filler-networks
#20
Hongju Zhou, Hua Deng, Li Zhang, Qiang Fu
The low efficiency of thermal conductive filler is an unresolved issue for the preparation of high performance thermal conductive polymer composites. Although it is known that minimizing the interfacial scattering of phonons or electrons is the key for thermal conductivity, the enhancement is generally limited by preparation methods that can yield the ideal morphology and interfaces. Herein, low temperature expandable graphite (LTEG) is added into a commercial impact modifier (Elvaloy®4170), which is then coated onto poly(butylene terephthalate) (PBT) particles with various sizes at millimeter scale between their melting temperatures...
August 9, 2017: ACS Applied Materials & Interfaces
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