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Nanoscale

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https://www.readbyqxmd.com/read/28722055/the-amyloid-architecture-provides-a-scaffold-for-enzyme-like-catalysts
#1
Z S Al-Garawi, B A McIntosh, D Neill-Hall, A A Hatimy, S M Sweet, M C Bagley, L C Serpell
Natural biological enzymes possess catalytic sites that are generally surrounded by a large three-dimensional scaffold. However, the proportion of the protein molecule that participates in the catalytic reaction is relatively small. The generation of artificial or miniature enzymes has long been a focus of research because enzyme mimetics can be produced with high activity at low cost. These enzymes aim to mimic the active sites without the additional architecture contributed by the protein chain. Previous work has shown that amyloidogenic peptides are able to self-assemble to create an active site that is capable of binding zinc and catalysing an esterase reaction...
July 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28717799/interface-interactions-and-enhanced-room-temperature-ferromagnetism-of-ag-ceo2-nanostructures
#2
Shih-Yun Chen, Eric Tseng, Yi-Ta Lai, William Lee, Alexandre Gloter
Enhancement of room temperature ferromagnetism (RTFM) has been achieved with core-shell metal-oxide nanoparticles (Ag@CeO2). To enhance the magnetic properties, interfacial charge transfer is achieved via the formation of a core-shell interface. Furthermore, by varying the shell thicknesses, additional control of the RTFM can be obtained. The Ag@CeO2 core-shell nanoparticles are synthesized successfully via a two-step method. Ag nanoparticles (NPs) are first synthesized on a TiO2 substrate by a thermally assisted photoreduction method, and then CeO2 NPs are deposited on the surface of Ag NPs by chemical reduction...
July 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715037/enhanced-current-rectification-and-self-powered-photoresponse-in-multilayer-p-mote2-n-mos2-van-der-waals-heterojunctions
#3
Bin Wang, Shengxue Yang, Cong Wang, Minghui Wu, Li Huang, Qian Liu, Chengbao Jiang
Vertically stacked van der Waals (vdW) heterojunctions based on two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted a great deal of attention and have created a powerful new material platform for novel, high-performance electronic and optoelectronic devices. Here, we report the construction of multilayer p-MoTe2/n-MoS2 vdW heterostructures with remarkable rectification behavior, self-powered photoresponse and distinct photosensitivity at different laser wavelengths and power densities...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715036/structure-induced-variation-of-thermal-conductivity-in-epoxy-resin-fibers
#4
Xiaoliang Zeng, Yucheng Xiong, Qiang Fu, Rong Sun, Jianbin Xu, Dongyan Xu, Ching-Ping Wong
The ability to control thermal conductivity is important in a wide variety of applications, especially in heat removal, heat insulation, and thermoelectric energy conversion. Herein, we reveal that the thermal conductivity of epoxy resin fibers increases on decreasing the fiber diameter and surpasses the bulk value (0.25 W m(-1) K(-1) at 300 K) for the fiber with a diameter of 211 nm. The variation of thermal conductivity in epoxy resin fibers can likely be attributed to their microstructure change-enhanced interface phonon scattering between amorphous and crystalline regions and the enhanced alignment of the molecular chain orientation...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715033/synthesis-of-metastable-hard-magnetic-%C3%AE%C2%B5-fe2o3-nanoparticles-from-silica-coated-akaganeite-nanorods
#5
Marin Tadic, Irena Milosevic, Slavko Kralj, Miodrag Mitric, Darko Makovec, Marie-Louise Saboungi, Laurence Motte
We present a simple preparation route to obtain a nanoscale metastable hard-magnetic ε-Fe2O3 phase, using silica coated β-FeOOH nanorods as a precursor and an annealing process. The synthesized ε-Fe2O3 nanoparticles exhibit large coercivity (HC ∼ 20 kOe at 300 K and HC ∼ 1.6 kOe at 400 K), confirming their high potential for practical applications.
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715025/compressed-few-layer-black-phosphorus-nanosheets-from-semiconducting-to-metallic-transition-with-the-highest-symmetry
#6
Guanjun Xiao, Ye Cao, Guangyu Qi, Lingrui Wang, Qingxin Zeng, Chuang Liu, Zhiwei Ma, Kai Wang, Xinyi Yang, Yongming Sui, Weitao Zheng, Bo Zou
The high-pressure response of few-layer black phosphorus (BP) nanosheets remains elusive, despite the special interest in it particularly after the achievement of an exotic few-layer BP based field effect transistor. Here, we identified a pressure-induced reversible phase transition on few-layer BP nanosheets by performing in situ ADXRD and Raman spectroscopy with the assistance of DAC apparatus. The few-layer BP nanosheets transformed from orthorhombic semiconductors to simple cubic metal with increasing pressure, which is well interpreted using the pressure-induced inverse Peierls distortion...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715023/amorphous-boron-nanorod-as-an-anode-material-for-lithium-ion-batteries-at-room-temperature
#7
Changjian Deng, Miu Lun Lau, Heather M Barkholtz, Haiping Xu, Riley Parrish, Meiyue Olivia Xu, Tao Xu, Yuzi Liu, Hao Wang, Justin G Connell, Kassiopeia A Smith, Hui Xiong
We report an amorphous boron nanorod anode material for lithium-ion batteries prepared through smelting non-toxic boron oxide in liquid lithium. Boron in theory can provide capacity as high as 3099 mA h g(-1) by alloying with Li to form B4Li5. However, experimental studies of the boron anode have been rarely reported for room temperature lithium-ion batteries. Among the reported studies the electrochemical activity and cycling performance of the bulk crystalline boron anode material are poor at room temperature...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715021/graphitic-nanocapsules-design-synthesis-and-bioanalytical-applications
#8
REVIEW
Ding Ding, Yiting Xu, Yuxiu Zou, Long Chen, Zhuo Chen, Weihong Tan
Graphitic nanocapsules are emerging nanomaterials which are gaining popularity along with the development of carbon nanomaterials. Their unique physical and chemical properties, as well as good biocompatibility, make them desirable agents for biomedical and bioanalytical applications. Through rational design, integrating graphitic nanocapsules with other materials provides them with additional properties which make them versatile nanoplatforms for bioanalysis. In this feature article, we present the use and performance of graphitic nanocapsules in a variety of bioanalytical applications...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715015/ultralight-highly-thermally-insulating-and-fire-resistant-aerogel-by-encapsulating-cellulose-nanofibers-with-two-dimensional-mos2
#9
Lei Yang, Alolika Mukhopadhyay, Yucong Jiao, Qiang Yong, Liao Chen, Yingjie Xing, Jonathan Hamel, Hongli Zhu
Thermally insulating materials, made from earth-abundant and sustainable resources, are highly desirable in the sustainable construction of energy efficient buildings. Cellulose from wood has long been recognized for these characteristics. However, cellulose can be a flammability hazard, and for construction this has been addressed via chemical treatment such as that with halogen and/or phosphorus, which leads to further environmental concerns. Fortunately, the structure of cellulose lends itself well to chemical modification, giving great potential to explore interaction with other compounds...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28715013/self-assembling-covalent-organic-framework-functionalized-magnetic-graphene-hydrophilic-biocomposites-as-an-ultrasensitive-matrix-for-n-linked-glycopeptide-recognition
#10
Jiaxi Wang, Jie Li, Mingxia Gao, Xiangmin Zhang
The development of additional functions and applications of covalent organic framework (COF)-derived materials still remains highly desired. In our work, a novel COF-functionalized magnetic graphene biocomposite (MagG@COF-5) was first developed as an ultrasensitive hydrophilic matrix via a facile self-assembly method for efficiently recognizing N-linked glycopeptides. By integrating the characteristics of the magnetic graphene and COF-5 layer, the MagG@COF-5 owns features of an outstanding magnetic response, a high specific area, strong hydrophilic properties and a unique size-exclusion effect...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28714508/gold-glyconanoparticles-coupled-to-listeriolysin-o-91-99-peptide-serve-as-adjuvant-therapy-against-melanoma
#11
R Calderon-Gonzalez, H Terán-Navarro, I García, M Marradi, D Salcines-Cuevas, S Yañez-Diaz, A Solis-Angulo, E Frande-Cabanes, M C Fariñas, A Garcia-Castaño, J Gomez-Roman, S Penades, F Rivera, J Freire, C Álvarez-Domínguez
Dendritic cell-based (DC-based) vaccines are promising immunotherapies for cancer. However, several factors, such as the lack of efficient targeted delivery and the sources and types of DCs, have limited the efficacy of DCs and their clinical potential. We propose an alternative nanotechnology-based vaccine platform with antibacterial prophylactic abilities that uses gold glyconanoparticles coupled to listeriolysin O 91-99 peptide (GNP-LLO91-99), which acts as a novel adjuvant for cancer therapy. GNP-LLO91-99, when used to vaccinate mice, exhibited dual antitumour activities, namely, the inhibition of tumour migration and growth and adjuvant activity for recruiting and activating DCs, including those from melanoma patients...
July 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28708191/brownmillerite-thin-films-as-fast-ion-conductors-for-ultimate-performance-resistance-switching-memory
#12
Susant Kumar Acharya, Janghyun Jo, Nallagatlla Venkata Raveendra, Umasankar Dash, Miyoung Kim, Hionsuck Baik, Sangik Lee, Bae Ho Park, Jae Sung Lee, Seung Chul Chae, Cheol Seong Hwang, Chang Uk Jung
An oxide-based resistance memory is a leading candidate to replace Si-based flash memory as it meets the emerging specifications for future memory devices. The non-uniformity in the key switching parameters and low endurance in conventional resistance memory devices are preventing its practical application. Here, a novel strategy to overcome the aforementioned challenges has been unveiled by tuning the growth direction of epitaxial brownmillerite SrFeO2.5 thin films along the SrTiO3 [111] direction so that the oxygen vacancy channels can connect both the top and bottom electrodes rather directly...
July 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702640/a-simple-high-yield-synthesis-of-high-purity-h%C3%A3-gg-carbide-%C3%AF-fe5c2-nanoparticles-with-extraordinary-electrochemical-properties
#13
Ondřej Malina, Petr Jakubec, Josef Kašlík, Jiří Tuček, Radek Zbořil
Iron carbides are of eminent interest in both fundamental scientific research and in the industry owing to their properties such as excellent mechanical strength and chemical inertness. They have been found very effective in Fischer-Tropsch synthesis exploring heterogeneous catalysis for the production of chemicals such as liquid fuel and they have also been employed as successful promoters for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). However, so far there have been only a few reports on the application of iron carbide nanoparticles in the field of electrochemical sensing...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702624/investigating-the-magnitude-and-source-of-orientation-dependent-interactions-between-tio2-crystal-surfaces
#14
Dongsheng Li, Hailong Wang, Dongdong Xiao, Miao Song, Benjamin Legg, Jaehun Chun
The oriented attachment (OA) of nanocrystals is a widely recognized non-classical crystallization mechanism. A fundamental understanding of the forces that governs the dynamics of particle movement, co-alignment, and attachment is needed to control crystal growth by OA. However, much remains unknown about the forces in the long range and molecular detail (such as the interfacial structure) effects in the short range, particularly in liquid suspensions. Using atomic force microscopy-based dynamic force spectroscopy to directly measure the adhesive force between two rutile TiO2 (001) crystal surfaces as a function of the lattice mismatch angle in water, we show that the forces exhibit 90° periodicity with respect to the lattice mismatch angle, which is generally consistent with the square-lattice arrangement of Ti(4+) centers on the rutile TiO2 (001) surface...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702577/high-magnetoresistance-at-low-magnetic-fields-in-self-assembled-zno-co-nanocomposite-films
#15
N Jedrecy, M Hamieh, C Hebert, J Perriere
The solid phase growth of self-assembled nanocrystals embedded in a crystalline host matrix opens up wide perspectives for the coupling of different physical properties, such as magnetic and semiconducting. In this work, we report the pulsed laser growth at room temperature of thin films composed of a dispersed array of ferromagnetic Co (0001) nanoclusters with an in-plane mono-size width of 1.3 nm, embedded in a ZnO (0001) crystalline matrix. The as-grown films lead to very high values of magnetoresistance, ranging at 9 T from -11% at 300 K to -19% at 50 K, with a steep decrease of the magnetoresistance at low magnetic fields...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702672/chitosan-stabilized-platinum-nanoparticles-as-effective-oxidase-mimics-for-colorimetric-detection-of-acid-phosphatase
#16
Hao-Hua Deng, Xiu-Ling Lin, Yin-Huan Liu, Ke-Lin Li, Qiong-Qiong Zhuang, Hua-Ping Peng, Ai-Lin Liu, Xing-Hua Xia, Wei Chen
Capping molecules on the surface of nanomaterials not only enhance the dispersion and stability of nanomaterials but also greatly facilitate their surface modification and biological applications. However, most capping molecules can severely block the active sites of the catalytic core, thereby decreasing the enzymatic activity of nanomaterial-based enzyme mimics. This work demonstrates the superiority of chitosan (Ch) as a capping molecule for synthesizing catalytic platinum nanoparticles (PtNPs). The experimental results show that Ch simultaneously exhibits an excellent stabilizing effect and enhances the oxidase-like activity of PtNPs...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702669/analogous-self-assembly-and-crystallization-a-chloride-directed-orientated-self-assembly-of-cu-nanoclusters-and-subsequent-growth-of-cu2-xs-nanocrystals
#17
Jiale Liu, Ye Tian, Zhennan Wu, Lin Ai, Yi Liu, Jianli Cui, Weili Yu, Hao Zhang, Bai Yang
Self-assembly and crystallization are two common methods to control the morphologies of nanomaterials, which have many similarities. In this work, chloride is used to direct the self-assembly process of Cu nanoclusters and the subsequent growth of Cu2-xS nanocrystals. Meaningfully, chloride both promotes the transformation of Cu nanocluster self-assembled architectures from one-dimensional (1D) to 2D, and facilitates the transformation of Cu2-xS nanocrystals from nanorods to nanosheets. Such an influence is attributed to the selective adsorption of chloride ions on the specific facets of nanoclusters and nanocrystals, which alters the inter-nanocluster weak interactions during self-assembly and suppresses the activity of Cu2-xS facets during nanocrystal growth...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702661/clinically-approved-pegylated-nanoparticles-are-covered-by-a-protein-corona-that-boosts-the-uptake-by-cancer-cells
#18
M Papi, D Caputo, V Palmieri, R Coppola, S Palchetti, F Bugli, C Martini, L Digiacomo, D Pozzi, G Caracciolo
Today, liposomes are an advanced technology of drug carriers with a dozen drugs in clinical practice and many more in clinical trials. A bottleneck associated with the clinical translation of liposomes has long been 'opsonization', i.e. the adsorption of plasma proteins at the liposome surface resulting in their rapid clearance from circulation. For decades, the most popular way to avoid opsonization has been grafting polyethylene glycol (PEG) onto the liposome surface. Recent studies have clarified that grafting PEG onto the liposome surface reduces, but does not completely prevent protein binding...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702658/overcoming-multidrug-resistance-using-folate-receptor-targeted-and-ph-responsive-polymeric-nanogels-containing-covalently-entrapped-doxorubicin
#19
Y Chen, O Tezcan, D Li, N Beztsinna, B Lou, T Etrych, K Ulbrich, J M Metselaar, T Lammers, W E Hennink
Multidrug resistance (MDR) contributes to failure of chemotherapy. We here show that biodegradable polymeric nanogels are able to overcome MDR via folic acid targeting. The nanogels are based on hydroxyethyl methacrylamide-oligoglycolates-derivatized poly(hydroxyethyl methacrylamide-co-N-(2-azidoethyl)methacrylamide) (p(HEMAm-co-AzEMAm)-Gly-HEMAm), covalently loaded with the chemotherapeutic drug doxorubicin (DOX) and subsequently decorated with a folic acid-PEG conjugate via copper-free click chemistry. pH-Responsive drug release is achieved via the acid-labile hydrazone bond between DOX and the methacrylamide polymeric network...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702656/polarization-landscape-effects-in-soft-x-ray-induced-surface-chemical-decomposition-of-lead-zirco-titanate-evidenced-by-photoelectron-spectromicroscopy
#20
Laura E Abramiuc, Liviu C Tănase, Alexei Barinov, Nicoleta G Apostol, Cristina Chirilă, Lucian Trupină, Lucian Pintilie, Cristian M Teodorescu
The stability of thin films of lead zirco-titanate (PZT) under intense soft X-ray beams is investigated by time-resolved photoelectron spectromicroscopy with a lateral resolution below 1 micrometer. Surface dissociation is observed when samples are irradiated with intense (5 × 10(23) photons per s per m(2)) soft X-rays, with promotion of reduced lead on the surface. On areas exhibiting outwards polarization (P((+))), the reduced lead is formed at the expense of P((+))-PZT. On areas presenting co-existing P((+)) states with areas without out-of-plane polarization (P((0))), the reduced lead is formed at the expense of the P((0))-PZT component, while the P((+))-PZT remains constant...
July 12, 2017: Nanoscale
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