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Silicon nanoparticles

Pei Huang, Yuanqing Li, Xiao-Guang Yu, Wei-Bin Zhu, Shu-Yan Nie, Hao Zhang, Jin-Rui Liu, Ning Hu, Shao-Yun Fu
The mimicry of human skin to detect both oncoming and physical-contacting object is of great importance in the fields of manufacturing, artificial robots and vehicles, etc. Herein, a novel bio-inspired flexible and highly responsive dual-mode strain/magnetism composite sensor which works via both contact and contactless modes, is first fabricated by incorporating Fe3O4/silicone system into a carbon fiber aerogel. The distance-dependence of magnetic field endorses the CFA/Fe3O4/silicone composite possible for spatial sensing due to the introduction of Fe3O4 magnetic nanoparticles...
March 15, 2018: ACS Applied Materials & Interfaces
Negin Sabziparvar, Yosra Saeedi, Mina Nouri, Atefeh Sadat Najafi Bozorgi, Elahe Alizadeh, Farnoosh Attar, Keivan Akhtari, Seyyedeh Elaheh Mousavi, Mojtaba Falahati
NPs have received a great attention in biological and medical applications due to their unique features. However, their induced adverse effects on the biological system are not well explored. Herein, the interaction of silicon dioxide nanoparticle (SiO2 NP) with human hemoglobin (Hb) and lymphocyte cell line was evaluated under physiological conditions by multi spectroscopic (intrinsic and synchronous fluorescence spectroscopy, and circular dichrosim (CD)), molecular docking, and cellular (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide (MTT) and acridine orange/ethidium bromide (AO/EB) staining) methods...
March 14, 2018: Journal of Physical Chemistry. B
Ilzira A Minigalieva, Boris A Katsnelson, Larisa I Privalova, Marina P Sutunkova, Vladimir B Gurvich, Vladimir Y Shur, Ekaterina V Shishkina, Irene E Valamina, Oleg H Makeyev, Vladimir G Panov, Anatoly N Varaksin, Tatiana V Bushueva, Renata R Sakhautdinova, Svetlana V Klinova, Svetlana N Solovyeva, Ekaterina Y Meshtcheryakova
Stable suspensions of metal/metalloid oxide nanoparticles (MeO-NPs) obtained by laser ablation of 99.99% pure elemental aluminum, titanium or silicon under a layer of deionized water were used separately, or in three binary combinations, or in a ternary combination to induce subchronic intoxications in rats. To this end, the MeO-NPs were repeatedly injected intraperitoneally (i.p.) 18 times during 6 weeks before measuring a large number of functional, biochemical, morphological and cytological indices for the organism's status...
March 13, 2018: International Journal of Molecular Sciences
Mohammad Mahdi Tavakoli, Fabrizio Giordano, Shaik M Zakeeruddin, Michael Grätzel
The solar to electric power conversion efficiency (PCE) of perovskite solar cells (PSCs) has recently reached 22.7 % exceeding that of competing thin film photovoltaics and the market leader polycrystalline silicon. Further augmentation of the PCE towards the Shockley-Queisser limit of 33.5 % warrants suppression of radiationless carrier recombination by judicious engineering of the interface between the light harvesting perovskite and the charge carrier extraction layers. Here, we introduce a mesoscopic oxide double layer as electron selective contact consisting of a scaffold of TiO2 nanoparticles covered by a thin film of SnO2, either in amorphous (a-SnO2), crystalline (c-SnO2) or nanocrystalline (quantum dot) form (SnO2-NC)...
March 12, 2018: Nano Letters
Sven Oras, Sergei Vlassov, Marta Berholts, Rünno Lõhmus, Karine Mougin
Adhesion forces between functionalized gold colloidal nanoparticles (Au NPs) and scanning probe microscope silicon tips were experimentally investigated by atomic force microscopy (AFM) equipped with PeakForce QNM (Quantitative Nanoscale Mechanics) module. Au NPs were synthesized by a seed-mediated process and then functionalized with thiols containing different functional groups: amino, hydroxy, methoxy, carboxy, methyl, and thiol. Adhesion measurements showed strong differences between NPs and silicon tip depending on the nature of the tail functional group...
2018: Beilstein Journal of Nanotechnology
Yo Han Kwon, Krysten Minnici, Jung Jin Park, Sujin R Lee, Guoyan Zhang, Esther S Takeuchi, Kenneth J Takeuchi, Amy C Marschilok, Elsa Reichmanis
Conjugated polymers possessing polar functionalities were shown to effectively anchor single-walled carbon nanotubes (SWNTs) to the surface of high-capacity anode materials, and enable the formation of electrical networks. Specifically, poly[3-(potassium-4-butanoate) thiophene] (PPBT) served as a bridge between SWNT networks and various anode materials, including monodispersed Fe3O4 spheres (sFe3O4), and silicon nanoparticles (Si NPs). The PPBT π‒conjugated backbone and carboxylate (COO‒) substituted alkyl side chains, respectively, attracted the SWNT π‒electron surface and chemically interacted with active material surface hydroxyl (‒OH) species to form a carboxylate bond...
March 10, 2018: Journal of the American Chemical Society
Zhala Meran, Alexandros Besinis, Tracy De Peralta, Richard D Handy
Patients with facial prostheses suffer from yeast, Candida albicans, infections. This study aimed to determine the biocompatibility and antifungal properties of silicone facial prostheses coated with silver nanoparticles (Ag NPs) in vitro. Medical grade silicone discs were coated with 5 and 50 mg L-1 dispersions of either Ag NPs or AgNO3 . Coatings were fully characterized using scanning electron microscopy and energy dispersive X-ray spectroscopy. The biocompatibility was examined using human dermal fibroblasts (Hs68), whereas antifungal efficacy was tested against C...
April 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Anping Cao, Meixia Shan, Laura Paltrinieri, Wiel H Evers, Liangyong Chu, Lukasz Poltorak, Johan H Klootwijk, Beatriz Seoane, Jorge Gascon, Ernst J R Sudhölter, Louis C P M de Smet
Recently various porous organic frameworks (POFs, crystalline or amorphous materials) have been discovered, and used for a wide range of applications, including molecular separations and catalysis. Silicon nanowires (SiNWs) have been extensively studied for diverse applications, including as transistors, solar cells, lithium ion batteries and sensors. Here we demonstrate the functionalization of SiNW surfaces with POFs and explore its effect on the electrical sensing properties of SiNW-based devices. The surface modification by POFs was easily achieved by polycondensation on amine-modified SiNWs...
March 9, 2018: Nanoscale
Nanqiang Shang, Qingguo Chen, Xinzhe Wei
The conductivity mismatch in the composite insulation of high voltage direct current (HVDC) cable accessories causes electric field distribution distortion and even insulation breakdown. Therefore, a liquid silicone rubber (LSR) filled with SiC nanoparticles is prepared for the insulation of cable accessories. The micro-morphology of the SiC/LSR nanocomposites is observed by scanning electron microscopy, and their trap parameters are characterized using thermal stimulated current (TSC) tests. Moreover, the dielectric properties of SiC/LSR nanocomposites with different SiC concentrations are tested...
March 8, 2018: Materials
Lei Su, Hongjie Wang, Min Niu, Xingyu Fan, Mingbo Ma, Zhongqi Shi, Sheng-Wu Guo
Ultralight ceramic aerogels with the property combination of recoverable compressibility and excellent high-temperature stability are attractive for use in harsh environments. However, conventional ceramic aerogels are usually constructed by oxide ceramic nanoparticles, and their practical applications have always been limited by the brittle nature of ceramics and volume shrinkage at high temperature. Silicon carbide (SiC) nanowire offers the integrated properties of elasticity and flexibility of one-dimensional (1D) nanomaterials and superior high-temperature thermal and chemical stability of SiC ceramics, which makes it a promising building block for compressible ceramic nanowire aerogels (NWAs)...
March 7, 2018: ACS Nano
Chunlian Mei, Jiaren Zou, Xu Huang, Bugao Zou, Peiqi Zhou, Zhikai Gan, Jieqiong Hu, Qian Zhang, Hui Wang
Silicon nanopyramids with excellent ability of light absorption have been mostly reported in solar cells. Here, we report an obviously enhanced lateral photovoltaic effect (LPE) in copper-nanoparticle-covered random Si nanopyramids (Cu@Si-pyramid). Remarkable photoelectric responses are achieved in broadband from 405 nm to 780 nm. Furthermore, a prominent LPE is double-enhanced from 74.0 mV/mm to 157.9 mV/mm when the linear region decreases from 3 mm to 1 mm. Finite-difference time-domain simulation is applied to investigate the origin of the exceptional results...
March 5, 2018: Nanotechnology
Ankur Chattopadhyay, Poonam Rani, Rajendra Srivastava, Purbarun Dhar
The present article discusses the typical influence of grafted conducting polymers in the mesoscale pores of dielectric particles on the static and dynamic electrorheology and electro-viscoelastic behavior of corresponding colloids. Nanocrystalline meso-nanoporous zeolite has been prepared by chemical synthesis and subsequently polyaniline (PANI) coating has been implemented. Electrorheological (ER) suspensions have been formed by dispersing the nanoparticles in silicone oil and their viscoelastic behaviors are examined to understand the nature of such complex colloidal systems under electric fields...
February 24, 2018: Journal of Colloid and Interface Science
Qiujun Lu, Xiaogen Chen, Dan Liu, Cuiyan Wu, Meiling Liu, Haitao Li, Youyu Zhang, Shouzhuo Yao
The selective and sensitive detection of dopamine (DA) is of great significance for the identification of schizophrenia, Huntington's disease, and Parkinson's disease from the perspective of molecular diagnostics. So far, most of DA fluorescence sensors are based on the electron transfer from the fluorescence nanomaterials to DA-quinone. However, the limited electron transfer ability of the DA-quinone affects the level of detection sensitivity of these sensors. In this work, based on the DA can reduce Ag+ into AgNPs followed by oxidized to DA-quinone, we developed a novel silicon nanoparticles-based electron transfer fluorescent sensor for the detection of DA...
May 15, 2018: Talanta
Guangyuan Yang, Zhixiong Huang, Xu Wang, Bo Wang
The paper proposed a method to improve the anti-oxidation performance of carbon fibers (CF) at high temperature environment by coating silicon dioxide (SiO₂) and silicon carbide (SiC). The modified sol-gel method had been used to ensure the proper interface between fibers and coating. We used polydimethylsiloxane and ethyl orthosilicate to make stable emulsion to uniformly disperse SiC nanoparticles. The modified SiO₂/SiC coating had been coated on CF successfully. Compared with the untreated CF, the coated fibers started to be oxidized around 900 °C and the residual weight was 57% at 1400 °C...
February 27, 2018: Materials
Letian Wang, Yoonsoo Rho, Wan Shou, Sukjoon Hong, Kimihiko Kato, Matthew Eliceiri, Meng Shi, Costas P Grigoropoulos, Heng Pan, Carlo Carraro, Dongfeng Qi
Manipulating and tuning nanoparticles by means of optical field interactions is of key interest for nanoscience and applications in electronics and photonics. We report scalable, direct, and optically modulated writing of nanoparticle patterns (size, number, and location) of high precision using a pulsed nanosecond laser. The complex nanoparticle arrangement is modulated by the laser pulse energy and polarization with the particle size ranging from 60 to 330 nm. Furthermore, we report fast cooling-rate induced phase switching of crystalline Si nanoparticles to the amorphous state...
February 26, 2018: ACS Nano
Jiajia Wang, Zhenhong Jia
A porous silicon microcavity (PSiMC) with resonant peak wavelength of 635 nm was fabricated by electrochemical etching. Metal nanoparticles (NPs)/PSiMC enhanced fluorescence substrates were prepared by the electrostatic adherence of Au NPs that were distributed in PSiMC. The Au NPs/PSiMC device was used to characterize the target DNA immobilization and hybridization with its complementary DNA sequences marked with Rhodamine red (RRA). Fluorescence enhancement was observed on the Au NPs/PSiMC device substrate; and the minimum detection concentration of DNA ran up to 10 pM...
February 23, 2018: Sensors
Yuanyuan Xie, Xiaofan Zeng, Xian Wu, Jun Hu, Yanhong Zhu, Xiangliang Yang
AIM: To study the effects of combinational treatment of hyperbaric oxygen (HBO) and nanotemozolomide in glioma. MATERIALS & METHODS: Temozolomide (TMZ)-loaded porous silicon nanoparticles (TMZ/PSi NPs) were prepared. In vitro and in vivo evaluations were performed. RESULTS: The cell uptake of TMZ/PSi NPs could be tracked by autofluorescence of porous silicon. The concentration of oxygen in tumor was improved and the antitumor rate was increased to 84...
February 23, 2018: Nanomedicine
Joseph Cremaldi, Bharat Bhushan
The mechanical properties, corrosion-resistance, and aesthetics of stainless steel make it one of the most important and widely used materials worldwide in the construction, food, and transportation industries just to name a few. In this paper we demonstrate how these properties can be further enhanced by changing the hydrophilic stainless steel surface to be superhydrophilic, superhydrophobic, or superliquiphobic. Creation of these functional surfaces requires hierarchical roughness and chemistry. Roughness is created using various pathways including sandblasting, chemical etching, and nanocomposite coatings...
February 13, 2018: Journal of Colloid and Interface Science
Maryam Sardar, Chen Jun, Zaka Ullah, Aasma Tabassum, Mohsan Jelani, Ju Cheng, Yuxiang Sun, Xueming Lv, Lu Jian
We irradiate the single crystal boron-doped silicon (Si) at various laser fluences with 100 laser shots in ambient air at room temperature using an Nd:YAG laser and investigate its surface morphology and optical properties. The optical microscopy gives evidence of the formation of a crater and reveals that the heat-affected zone and melted area are increased with increase in laser fluence from 1.1 to 15.4  J/cm2 . The micrographs obtained by scanning electron microscopy (SEM) show that the micro- and nano-structures such as microcracks, bubbles, nucleation sites, clusters, redeposited layered material, nanoparticles, and alike water droplet structures are formed on a laser-exposed Si surface...
February 20, 2018: Applied Optics
M K Md Arshad, R Adzhri, M F M Fathil, Subash C B Gopinath, Nuzaihan M N M
The development of electrical biosensor towards device miniaturization in order to achieve better sensitivity with enhanced electrical signal has certain limitations especially complexity in fabrication process and costs. In this paper, an alternative technique with minor modification in the device structure is presented for signal amplification by implementing ambipolar conduction in the biosensor itself. We demonstrated the field-effect transistor (FET)-based biosensor coupled back-gate for attaining a higher sensitivity with the detection of lower target abundance...
August 1, 2018: Journal of Nanoscience and Nanotechnology
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