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ACS Applied Materials & Interfaces

Aliakbar Gholampour, Meisam Valizadeh Kiamahalleh, Diana N H Tran, Togay Ozbakkaloglu, Dusan Losic
Graphene materials have been extensively explored and successfully used to improve performances of cement composites. These formulations were mainly optimized based on different dosages of graphene additives, but with lack of understanding how other parameters such as surface chemistry, size, charge, and defects of graphene structures could impact on physiochemical and mechanical properties of final material. This paper presents the first experimental study to evaluate the influence of oxygen functional groups of graphene and defectiveness of graphene structures on the axial tension and compression properties of graphene-cement mortar composites...
November 22, 2017: ACS Applied Materials & Interfaces
Dennis T Lee, Junjie Zhao, Christopher J Oldham, Gregory W Peterson, Gregory N Parsons
Metal-organic frameworks (MOFs) chemically bound to polymeric microfibrous textiles show promising performance for many future applications. In particular, Zr-based UiO-66-family MOF-textiles have been shown to catalytically degrade highly toxic chemical warfare agents (CWAs), where favorable MOF/polymer bonding and adhesion are attained by placing a nanoscale metal-oxide layer on the polymer fiber preceding MOF growth. To date, however, the nucleation mechanism of Zr-based MOFs on different metal oxides and how product performance is affected are not well understood...
November 22, 2017: ACS Applied Materials & Interfaces
Kai-En Hung, Che-En Tsai, Shao-Ling Chang, Yu-Ying Lai, U-Ser Jeng, Fong-Yi Cao, Chain-Shu Hsu, Chun-Jen Su, Yen-Ju Cheng
A new class of additive materials bis(pentafluorophenyl) diesters (BFEs) where the two pentafluorophenyl (C6F5) moieties are attached at the both ends of a linear aliphatic chain with tunable tether lengths (BF5, BF7, and BF13) were designed and synthesized. In the presence of the BF7 to restrict the migration of fullerene by hand-grabbing-like supramolecular interactions induced between the C6F5 groups and the surface of fullerene, the P3HT:PC61BM:BF7 device showed stable device characteristics after thermal heating at 150 oC for 25 h...
November 22, 2017: ACS Applied Materials & Interfaces
Zhenzhen Shi, Hao Liu, Yaping Wang, Jinyan Li, Yiming Bai, Fuzhi Wang, Xingming Bian, Tasawar Hayat, Ahmed Alsaedi, Zhan'ao Tan
For bulk heterojunction polymer solar cells (PSCs), the donors and acceptors featuring specific phase separation and concentration distribution within the electron donor:acceptor blends crucially affect the exciton dissociation and charge transportation. Herein, efficient and stable nonfullerene inverted PSCs incorporating phase separated photoactive layer and titanium chelate electrode modification layer are demonstrated. Water contact angle (WCA), scanning kelvin probe microscopy (SKPM), and atomic force microscopy (AFM) techniques are implemented to characterize the morphology of photoactive layers...
November 22, 2017: ACS Applied Materials & Interfaces
Artur Bednarkiewicz, Karolina Trejgis, Joanna Drabik, Agnieszka Kowalczyk, Lukasz Marciniak
Phosphor Assisted Luminescent Thermometry relays on studying, often subtle, temperature dependent spectral properties, such as luminescence spectra, bands shifts or luminescence lifetimes. While this is feasible with high resolution spectrometers or time resolved detectors, technical implementation of such temperature mapping or wide field imaging is complex and cumbersome. Therefore, new approach for non-contact ratiometric temperature detection has been proposed based on comparison of emission properties of bright Cr3+ doped phosphors at single emission band upon two, resonant and non-resonant optical excitation bands...
November 22, 2017: ACS Applied Materials & Interfaces
Seon Sook Lee, Goeun Choi, Hyun Jung Lee, Yelin Kim, Jin-Ho Choy, Byeongmoon Jeong
Stem cell therapy for damaged cartilages suffers from the low rates of retention, survival, and differentiation into chondrocytes at the target site. To solve these problems, here we propose a two dimensional/three dimensional (2D/3D) nanocomposite system. As a new two dimensional (2D) material, hexagonal layered double hydroxides (LDHs) with a uniform lateral length of 2-3 μm were prepared by a hydrothermal process. And then, tonsil-derived mesenchymal stem cells (TMSCs), RGD-coated LDHs, and kartogenin (KGN) were incorporated into the gel through the thermal energy-driven gelation of the system...
November 22, 2017: ACS Applied Materials & Interfaces
Yongjoon Heo, Su Yeon Lee, Ji-Won Kim, Tae Yoon Jeon, Shin-Hyun Kim
Inverse opals have been used for structural coloration and photonic applications owing to their photonic bandgap properties. When the photonic structures contain planar defects, they provide defect modes, which are useful for lasing, sensing, and waveguiding. However, it remains a challenge to insert a planar defect into inverse opals in a reproducible manner. Here, we report a new method for producing planar-defect-inserted inverse opals using sequential capillary wetting of colloidal crystals and creating micropatterns through photolithography...
November 22, 2017: ACS Applied Materials & Interfaces
Umar Aslam, Suljo Linic
Bimetallic nanoparticles in which a metal is coated with an ultrathin (~1 nm) layer of a second metal are often desired for their unique chemical and physical properties. Current synthesis methods for producing such core-shell nanostructures often require incremental addition of a shell metal precursor which is rapidly reduced onto metal cores. A major shortcoming of this approach is that it necessitates precise concentrations of chemical reagents making it difficult to perform at large scales. To address this issue, we considered an approach whereby the reduction of the shell metal precursor was controlled through in-situ chemical modification of the precursor...
November 22, 2017: ACS Applied Materials & Interfaces
Biao Guo, Jianxiong Han, Jing Qiu, Chengzhuo Yu, Yuqian Sun, Fenghong Li, Zhonghan Hu, Yue Wang
Alcohol-soluble isoindigo derivative with thiophene groups and sulfobetain zwitterions, IIDTh-NSB was applied as a novel modifier of ZnO in the inverted polymer solar cells (i-PSCs). When IIDTh-NSB (0.2mg/mL) was spin-coated on ZnO as an electron transport layer (ETL), power conversion efficiency (PCE) of the PTB7:PC71BM based i-PSCs reached 8.88% which is a 20% improvement of that of 7.40% for the device with pure ZnO ETL. If ZnO was doped by IIDTh-NSB of 1.0 wt%, the PCE of 8.50% could be achieved in the i-PSCs...
November 22, 2017: ACS Applied Materials & Interfaces
Chenguang He, Wei Zhao, Kang Zhang, Longfei He, Hualong Wu, Ningyang Liu, Shan Zhang, Xiaoyan Liu, Zhitao Chen
It is widely believed that the lack of high-quality GaN wafers severely hinders the progress in GaN-based devices, especially for defect-sensitive devices. Here, low-cost AlN buffer layers were sputtered on cone-shaped patterned sapphire substrates (PSSs) to obtain high-quality GaN epilayers. Without any mask or regrowth, facet-controlled epitaxial lateral overgrowth (FACELO) was realized by metal-organic chemical vapor deposition (MOCVD). The uniform coating of sputtered AlN buffer layer and the optimized multiple-modulation guaranteed the high growth selectivity and uniformity of GaN epilayer...
November 22, 2017: ACS Applied Materials & Interfaces
Tanglue Feng, Shoujun Zhu, Qingsen Zeng, Siyu Lu, Songyuan Tao, Junjun Liu, Bai Yang
Involvement of clear photoluminescence (PL) mechanism in specific chemical structure is at forefront of carbon dots (CDs). Supramolecular interaction existing in plenty of materials, offers an inherent way to administrate the optical and photophysical properties, especially in terms of newly developed polymer carbon dots (PCDs). However, supramolecular interaction-derived PL regulation is always ignored in the shadow of many kinds of PL factors, and we still have a limited understanding on the distinct chemical structure and mechanism of supramolecular effect in PCDs...
November 22, 2017: ACS Applied Materials & Interfaces
Lawrence A Limjuco, Grace Masbate Nisola, Rey Eliseo Castillo Torrejos, Jeong Woo Han, Ho Seong Song, Khino J Parohinog, Sangho Koo, Seong-Poong Lee, Wook-Jin Chung
Crown ether (CE)-based Li(+) adsorbent microfibers (MFs) were successfully fabricated through a combined use of CE diols, electrospinning, and aerosol crosslinking. The 14-16 membered CEs, with varied ring sub-units and cavity dimensions, have two hydroxyl groups for covalent attachments to poly(vinyl alcohol) (PVA) as the chosen matrix. The CE diols were blended with PVA and transformed into microfibers via electrospinning, a highly effective technique in minimizing CE loss during MF fabrication. Subsequent aerosol glutaraldehyde (GA) crosslinking of the electrospun CE/PVA MFs stabilized the adsorbents in water...
November 22, 2017: ACS Applied Materials & Interfaces
Ruiying Yang, Xiaoxia Yan, Yanmei Li, Xiaohua Zhang, Jinhua Chen
Herein, novel photoactive materials, nitrogen-doped porous carbon-ZnO (NPC-ZnO) nanopolyhedra, were prepared by direct carbonization of ZIF-8 nanopolyhedra in a nitrogen atmosphere. The morphology, structure and photoelectrochemical (PEC) properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, nitrogen adsorption-desorption method, and PEC methods. The results showed that the obtained NPC-ZnO nanopolyhedra had rhombic dodecahedron morphology with uniform particle size of about 100 nm and high surface area of 609...
November 22, 2017: ACS Applied Materials & Interfaces
Hui-Ying Qu, Daniel Primetzhofer, Miguel A Arvizu, Zhen Qiu, Umut Cindemir, Claes G Granqvist, Gunnar A Niklasson
Nickel oxide thin films are of major importance as anodically coloring components in electrochromic smart windows with applications in energy-efficient buildings. However, the optical performance of these films degrades upon extended electrochemical cycling, which has hampered their implementation. Here, we use a potentiostatic treatment to rejuvenate degraded nickel oxide thin films immersed in electrolytes of LiClO4 in propylene carbonate. Time-of-flight elastic recoil detection analysis provided unambiguous evidence that both Li+ ions and Cl-based ions participate in the electrochromism...
November 22, 2017: ACS Applied Materials & Interfaces
Rui Liu, Guiliang Xu, Qi Li, Shiyao Zheng, Guorui Zheng, Zhengliang Gong, Yixiao Li, Elizaveta Kruskop, Riqiang Fu, Zonghai Chen, Khalil Amine, Yong Yang
Development of highly reversible multi-electron reaction per redox center in NASICON-structured cathode materials is desired to improve the energy density of Sodium-ion batteries. Here, we investigated more than one electron storage of Na in Na3VCr(PO4)3. Combining a series of advanced characterization techniques such as ex situ 51V solid-state nuclear magnetic resonance, X-ray absorption near edge structure and in situ X-ray diffraction, we reveal that, V3+/V4+ and V4+/V5+ redox couples in the materials can be accessed, leading to 1...
November 22, 2017: ACS Applied Materials & Interfaces
Hui Wang, Yuling Liang, Wei Gao, Renfeng Dong, Chaoyang Wang
An emulsion hydrogel motor (E-H-motor) constituted by low-boiling oil fuel and hydrogel matrix, is prepared through a simple yet versatile oil-in-water (O/W) emulsion template method. The E-H-motor can be efficiently propelled by the bubbles generated under thermal stimulus. As thermal-inducted explosion occurs inside the E-H-motor (diameter ~4.0 mm, length ~6.0 mm), the gas bubbles resulting from thermotropic phase transition are violently ejected from one side, leading to a fast speed of 14.78 ± 4.82 mm s-1 in a 60 oC aqueous solution...
November 22, 2017: ACS Applied Materials & Interfaces
Dejan Davidovikj, Paul H Scheepers, Herre S J van der Zant, Peter Gerard Steeneken
To realize nanomechanical graphene-based pressure sensors, it is beneficial to have a method to electrically readout the static displacement of a suspended graphene membrane. Capacitive readout, typical in micro-electro-mechanical systems (MEMS), gets increasingly challenging as one starts shrinking the dimensions of these devices, since the expected responsivity of such devices is below 0.1 aF/Pa. To overcome the challenges of detecting small capacitance changes, we design an electrical readout device fabricated on top of an insulating quartz substrate, maximizing the contribution of the suspended membrane to the total capacitance of the device...
November 22, 2017: ACS Applied Materials & Interfaces
Doreen Chan, Yichuan Ding, Reinhold H Dauskardt, Eric A Appel
Polymer networks are extensively utilized across numerous applications ranging from commodity superabsorbent polymers and coatings to high-performance microelectronics and biomaterials. For many applications, desirable properties are known; however, achieving them has been challenging. Additionally, the accurate prediction of elastic modulus has been a long-standing difficulty owing to the presence of loops. By tuning the prepolymer formulation through precise doping of monomers, specific primary network defects can be programmed into an elastomeric scaffold, without alteration of their resulting chemistry...
November 22, 2017: ACS Applied Materials & Interfaces
Wei Zhao, Chuan Liang, Beibei Wang, Shengtao Xing
A series of CuOx-decorated ZnFe2O4 samples were prepared by a hydrothermal method and investigated as a catalyst for the photocatalytic and Fenton-like degradation of Orange II. The active species and catalyst active sites in the two processes were also studied. It was found that the introduced CuOx significantly enhanced the photocatalytic and Fenton-like performance of ZnFe2O4. Especially, ZnFe2O4-Cu3 prepared with the Cu/Zn ratio of 3:7 exhibited a very high Fenton-like activity in the pH range 5-9. The enhanced photocatalytic activity of ZnFe2O4-Cu3 could be because the formed ZnFe2O4/Cu2O heterojunction improved the separation efficiency of the photogenerated carriers...
November 22, 2017: ACS Applied Materials & Interfaces
Shuxin Wei, Jie Liu, Yuanyuan Zhao, Tingbin Zhang, Meiling Zheng, Feng Jin, Xianzi Dong, Jinfeng Xing, Xuanming Duan
The microtechnology of controlling stimuli-responsive biomaterials at micrometer scale is crucial for biomedical applications. Here, we report bovine serum albumin (BSA)-based three-dimensional (3D) microstructures with tunable surface morphology and pH-responsive properties via two-photon polymerization microfabrication technology. The laser processing parameters, including laser power, scanning speed, and layer distance, are optimized for the fabrication of well-defined 3D BSA microstructures. The tunable morphology of BSA microstructures and a wide range of pH response corresponding to the swelling ratio of 1...
November 22, 2017: ACS Applied Materials & Interfaces
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