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ACS Applied Materials & Interfaces

Eduardo Guisasola, Laura Asín, Lillianne Beola, Jesús M De La Fuente, Alejandro Baeza, María Vallet Regí
This work presents an innovation in the tumor treatment in vivo mediated by magnetic mesoporous silica nanoparticles (MMSNs). This device was built with iron oxide magnetic nanoparticles embedded in a mesoporous silica matrix and coated with an engineered thermoresponsive polymer. The magnetic nanoparticles act as internal heating sources under an alternating magnetic field (AMF) that increase the temperature of the surroundings, provoking the polymer transition and consequently the release of a drug trapped inside the silica pores...
March 21, 2018: ACS Applied Materials & Interfaces
Zhuoyue Chen, Zhen Zhang, Juantao Feng, Yayuan Guo, Yuan Yu, Jihong Cui, Hongmin Li, Lijun Shang
One of the key challenges in bone healing and regeneration is the implant with osteoinductive activity. Therapeutic application of recombinant human bone morphogenetic protein-2 (rhBMP-2) is a promising approach to enhance osteogenesis. However, high dose and uncontrolled burst in the release kinetics of BMP-2 may introduce oedema, bone overgrowth, cyst-like bone formation and significant inflammation. In this study, low dose BMP-2 of 1µg was used to design PLA-PD-BMP for functionalization of polylactic acid (PLA) implants via mussel-inspired polydopamine (PD) assist...
March 21, 2018: ACS Applied Materials & Interfaces
Martha M Gross, Arumugam Manthiram
Large scale energy storage for the electric grid will require low cost and high energy density solutions. We demonstrate in this letter a rechargeable zinc-aqueous polysulfide battery in which a metallic zinc anode is separated from a liquid aqueous polysulfide catholyte by an alkali-metal-ion solid-state electrolyte, wherein the alkali metal ion is Na+ or Li+. The solid-state electrolyte effectively separates the anode from the reactive polysulfide catholyte, preventing the crossover of the polysulfide species and maintaining good electrochemical performance with a reversible discharge capacity of 822 mA h g-1 with nearly 100% Coulombic efficiency...
March 21, 2018: ACS Applied Materials & Interfaces
Haibo Tang, Junming Luo, Xin Long Tian, Yuanyuan Dong, Jing Li, Mingrui Liu, Lina Liu, Huiyu Song, Shijun Liao
Developing cheap and stable electrocatalysts to replace Pt for the oxygen reduction reaction (ORR) is recognized as the key factor to achieve the large-scale application of fuel cells. In this paper, 3D porous Co-doped vanadium nitride (VN) nanosheet-assembled microflowers are prepared with a facile solvothermal approach followed by nitridation at 500°C in NH3. It is found that the microflower morphology and the Co doping both significantly enhance the ORR performance of the materials. Since the unique 3D porous structure provides higher specific surface area and more active sites as well as enriching the d electrons of V via doping, Co also improves the intrinsic activity of VN...
March 21, 2018: ACS Applied Materials & Interfaces
Li Wan, Hongyuan Song, Junhao Ma, Yuan Ren, Xiaowei Cheng, Jiacan Su, Qin Yue, Yonghui Deng
Iron oxide materials have wide applications due to their special physicochemical properties; however, it is a great challenge to synthesize mesoporous iron oxide based microspheres conveniently and controllably with high surface area, large pore volume and interconnected porous structures. Herein, mesoporous α-Fe2O3 based microspheres with high porosity are synthesized via a facile polymerization induced colloid assembly (PICA) method through polymerization of urea-formaldehyde resin (UF resin) and its simultaneously cooperative assembly with Fe(OH)3 colloids in aqueous solution, followed with subsequent thermal treatment...
March 21, 2018: ACS Applied Materials & Interfaces
Jeong In Kim, Cheol Sang Kim
The cells respond to their microenvironment which is comparable size to the cells. The macroscale features of three dimensional (3D) printing struts (PS) typically result in whole cell contact guidance (CCG). In contrast, at the nanoscale, where features are similar size to receptors of the cells, the response of cells is more complex. In detail, integrin that is one of the cellular receptors involved with cell adhesion is recognized as communication channels through that the cells interact with adjacent surface features...
March 21, 2018: ACS Applied Materials & Interfaces
HyeJin Lee, Suk Bum Lim, Jin Young Kim, Mihee Jeong, Yong Joon Park, Won-Sub Yoon
Li-rich layered oxide has been known to possess high specific capacity beyond the theoretical value from both charge compensation in transition metal and oxygen in the redox reaction. Although it could achieve higher reversible capacity due to the oxygen anion participating in electrochemical reaction, however, its use in energy storage systems has been limited. The reason is the irreversible oxygen reaction that occurs during the initial charge cycle, resulting in structural instability due to oxygen evolution and phase transition...
March 21, 2018: ACS Applied Materials & Interfaces
Lei He, Xiaoxiang Wang, Lian Duan
Light-emitting electrochemical cells (LECs) have emerged as a promising emissive thin-film technology for next-generation solid-state lighting. However, blue LECs show low performances, which has remained a bottleneck for the fabrication of white LECs for lighting applications. Here, we demonstrate a remarkable enhancement of overall device performance for blue LECs by using an electron-injecting/transporting ionic additive, i.e., [Zn(bpy)3](PF6)2 (bpy is 2.2'-bipyridine, PF6- is hexafluorophosphate). It is revealed that adding [Zn(bpy)3](PF6)2 into the active layers of blue LECs accelerates the device response, enhances simultaneously the brightness and efficiency, reduces the efficiency roll-offs, improves significantly the blue-color stability upon the continuous electrical operation and enhances the device operational stability at optimized conditions...
March 21, 2018: ACS Applied Materials & Interfaces
Katarzyna Kaczmarek, Tomasz Hornowski, Martina Kubovcíkova, Milan Timko, Marceli Koralewski, Arkadiusz Józefczak
The efficiency of ultrasound hyperthermia for anti-cancer treatments such as radiotherapy or chemotherapy can be improved by using sonosensitizers, which are materials that enhance the attenuation and dissipation of acoustic energy. We propose the use of magnetic nanoparticles as sonosensitizers because of their biocompatibility, non-toxicity, and common use in several medical applications. A magnetic material was synthetized and then incorporated in the form of a magnetic fluid in agar tissue-mimicking phantoms...
March 21, 2018: ACS Applied Materials & Interfaces
Lei Yang, Rebecka Lindblad, Erik Gabrielsson, Gerrit Boschloo, Håkan Rensmo, Licheng Sun, Anders Hagfeldt, Tomas Edvinsson, Erik M J Johansson
4-tert-butylpyridine (t-BP) is commonly used in solid state dye-sensitized solar cells (ssDSSCs) to increase the photo-voltaic performance. In this report, the mechanism how t-BP functions as a favorable additive is investigated compre-hensively. ssDSSCs were prepared with different concentration of t-BP and a clear increase in efficiency was observed up to a maximum concentration and for higher concentrations the efficiency thereafter decreases. The energy level alignment in the complete devices was measured using hard X-ray photoelectron spectroscopy (HAXPES)...
March 21, 2018: ACS Applied Materials & Interfaces
Guangxue Feng, Jie Liu, Chong-Jing Zhang, Bin Liu
Cell organelle targeting is a promising approach for cancer therapy. Herein, we report a mitochondria-targeted light-up probe (TPETH-Mito-1ART) to co-deliver artemisinin (ART) and an AIE photosensitizer (PS) to mitochondria for image-guided combination cancer cell ablation. This probe contains an AIEgen core of TPETH, two mitochondria targeting arms with ART on one arm, which could be internalized into cancer cells over normal ones, and show predominant accumulation and fluorescence turn-on in mitochondria...
March 21, 2018: ACS Applied Materials & Interfaces
Inho Song, Seung-Chul Lee, Xiaobo Shang, Jaeyong Ahn, Hoon-Joo Jung, Chan-Uk Jeong, Sang-Wook Kim, Woojin Yoon, Hoseop Yun, O-Pil Kwon, Joon Hak Oh
This study investigates the performance of single-crystalline nanomaterials of wide-bandgap naphthalene diimide (NDI) derivatives with methylene-bridged aromatic side chains. Such materials are found to be easily used as high-performance, visible-blind near-UV light detectors. NDI single-crystalline nanoribbons are assembled using a simple solution-based process (without solvent-inclusion problems), which is then applied to organic phototransistors (OPTs). Such OPTs exhibit excellent n-channel transistor characteristics, including an average electron mobility of 1...
March 21, 2018: ACS Applied Materials & Interfaces
Sungsik Lee, Arokia Nathan, Jack Alexander-Webber, Philipp Braeuninger-Weimer, Abhay A Sagade, Haichang Lu, David Hasko, John Robertson, Stephan Hofmann
A positive shift in the Dirac point in graphene field-effect transistors was observed with Hall-effect measurements coupled with Kelvin-probe measurements at room temperature. This shift can be explained by the asymmetrical behavior of the contact resistance by virtue of the electron injection barrier at the source contact. As an outcome, an intrinsic resistance is given to allow a retrieval of an intrinsic carrier mobility found to be decreased with increasing gate bias, suggesting the dominance of short-range scattering in a single-layer graphene field-effect transistor...
March 21, 2018: ACS Applied Materials & Interfaces
Meysam Makaremi, Sean Grixti, Keith T Butler, Geoffrey A Ozin, Chandra Veer Singh
Since hydrogen fuel involves the highest energy density among all fuels, production of this gas through the solar water splitting approach has been suggested as a green remedy for greenhouse environmental issues due to extensive consumption of fossil fuels. Low-dimensional materials possessing a large surface-to-volume ratio can be a promising candidate to be used for the photocatalytic approach. Here, we used extensive first-principles calculations to investigate the application of newly fabricated members of two-dimensional carbon nitrides including tg-C3 N4 , hg-C3 N4 , C2 N, and C3 N for water splitting...
March 21, 2018: ACS Applied Materials & Interfaces
Carlos Rumbo, Juan Antonio Tamayo-Ramos, M Federica Caso, Antonio Rinaldi, Lorena Romero-Santacreu, Roberto Quesada, Santiago Cuesta
Electrospun biodegradable polymers have emerged as promising materials for their applications in several fields, including biomedicine and food industry. For this reason, the susceptibility of these materials to be colonized by different pathogens is a critical issue for public health, and their study can provide future knowledge to develop new strategies against bacterial infections. In this work, the ability of three pathogenic bacterial species ( Pseudomonas aeruginosa, Acinetobacter baumannii and Listeria monocytogenes) to adhere and form biofilm in electrospun polycaprolactone (PCL) microfibrous meshes was investigated...
March 20, 2018: ACS Applied Materials & Interfaces
Seyedmehdi Hossaini Nasr, Anne Tonson, Mohammad El-Dakdouki, David C Zhu, Dalen Agnew, Robert Wiseman, Chunqi Qian, Xuefei Huang
Atherosclerosis is an inflammatory disease of arterial walls and the rupturing of atherosclerotic plaques is a major cause of heart attack and stroke. Imaging techniques that can enable the detection of atherosclerosis plaques before clinical manifestation are urgently needed. Magnetic resonance imaging (MRI) is a powerful technique to image the morphology of atherosclerotic plaques. In order to better analyze molecular processes in plaques, contrast agents that can selectively bind to plaque receptors will prove invaluable...
March 20, 2018: ACS Applied Materials & Interfaces
Chengbo Tian, Shujing Zhang, Anyi Mei, Yaoguang Rong, Yue Hu, Kai Du, Miao Duan, Yusong Sheng, Pei Jiang, Gengzhao Xu, Hongwei Han
The printable mesoscopic perovskite solar cells (PMPSCs) have exhibited great attracting prospects in the energy conversion field due to their high stability and potential scalability. However, the thick perovskite film in the mesoporous layers challenge the charge transportation and increase grain boundary defects, limiting the performance of the PMPSCs. It is critical not only to improve the electric property of the perovskite film but also to passivate the charge traps to improve the device performance. Herein we synthesized a bis-adduct 2, 5-(Dimethyl ester) C60 fulleropyrrolidine (bis-DMEC60 ) via rational molecular design and incorporated it into the PMPSCs...
March 20, 2018: ACS Applied Materials & Interfaces
Yanyan Gao, Jianping Xu, Shaobo Shi, Hong Dong, Yahui Cheng, Chengtai Wei, Xiaosong Zhang, Shougen Yin, Lan Li
The self-powered ultraviolet photodetectors (UV PDs) have attracted increasing attention due to their potential applications without consuming any external power. It is important to obtain the high performance self-powered UV PDs by a simple method for the practical application. Herein, TiO2 nanorod arrays (NRs) were synthesized by hydrothermal method, which were integrated with p-type NiO nanoflakes to realize a high performance pn heterojunction for the efficient UV photodetection. TiOx thin film can improve the morphological and carrier transport properties of TiO2 NRs, and decrease the surface and defect states, resulting in the enhanced photocurrent of the devices...
March 20, 2018: ACS Applied Materials & Interfaces
Joseph Houston Dycus, Kelsey J Mirrielees, Everett D Grimley, Ronny Kirste, Seiji Mita, Zlatko Sitar, Ramon Collazo, Doug Irving, James M LeBeau
When pristine material surfaces are exposed to air, highly reactive broken bonds can promote the formation of surface oxides with structures and properties differing greatly from bulk. Determination of the oxide structure, however, is often elusive through the use of indirect diffraction methods or techniques that probe only the outer most layer. As a result, surface oxides forming on widely used materials, such as group III-nitrides, have not been unambiguously resolved, even though critical properties can depend sensitively on their presence...
March 20, 2018: ACS Applied Materials & Interfaces
Lan Hui, Dianzeng Jia, Huidi Yu, Yurui Xue, Yuliang Li
We employed a two-step strategy for preparing ultrathin graphdiyne-wrapped iron carbonate hydroxide nanosheets on nickel foam (FeCH@GDY/NF) as the efficient catalysts toward the electrical splitting water. The introduction of naturally porous GDY nanolayers on FeCH surface endows the pristine catalyst with structural advantages for boosting catalytic performances. Benefited from the protection of robust GDY nanolayers with intimate contact between GDY and FeCH, the combined material exhibits high long-term durability of 10 000 cycles for oxygen-evolution reaction (OER) and 9000 cycles for hydrogen evolution reaction (HER) in 1...
March 20, 2018: ACS Applied Materials & Interfaces
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