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Silicon nanoparticles

Prithwish Chatterjee, Elizabeth M Nofen, Wenwen Xu, Conrad Hom, Hanqing Jiang, Lenore L Dai
Poly(ionic liquid) (PIL) derivatives with pyrrole intrinsically conducting polymer (ICP) backbones were synthesized and utilized as novel dispersants of multi-walled carbon nanotubes (MWCNTs) in various aqueous and non-aqueous systems, including polar and nonpolar solvents. This is due to the highly tunable nature of the PIL, in which the PILs of varying polarity with the same pyrrole-based polycation can be synthesized. The dispersions are exceedingly stable over many months, and with the addition of hexane, Pickering (solid-stabilized) emulsions with the PIL-stabilized MWCNTs at the droplet interfaces were formed...
April 8, 2017: Journal of Colloid and Interface Science
Zhaohui Cao, Fei Peng, Zhilin Hu, Binbin Chu, Yiling Zhong, Yuanyuan Su, Sudan He, Yao He
Extensive investigations have been carried out for evaluating the toxicology of various nanomaterials (e.g., carbon- and metal-based nanomaterials), which offer invaluable information for assessing the feasibility of nanomaterial-based wide-ranging applications. In recent years, sufficient efforts have been made to develop fluorescent small-sized silicon nanoparticles (SiNPs) as a novel optical material simultaneously featuring strong fluorescence and ultrahigh photostability, providing high promise for a myriad of biological, biomedical and electronic applications...
May 25, 2017: Nanoscale
Taher Alizadeh, Mohammad Reza Ganjali, Faride Rafiei, Maedeh Akhoundian
A novel timolol voltammetric sensor based on the nano-sized molecularly imprinted polymer (nano-MIP)-modified carbon paste electrode was introduced. Timolol-imprinted polymers (MIP) were synthesized by the ultrasonic assisted suspension polymerization in silicon oil. The MIP nanoparticles were then embedded in a carbon paste (CP) electrode in order to prepare the nano-MIP-CP electrode. Timolol was extracted in the electrode for a definite time and then it was analyzed by square wave voltammetry, found to be an effective determination method...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Vinod Kumar Gupta, Ali Fakhri, Sahar Rashidi, Ahmed A Ibrahim, Mohammad Asif, Shilpi Agarwal
The subject of this paper is removal of Aflatoxin B1 as toxic biological compound adsorption onto Silicon (Si) and Silicon carbide (SiC) nanoparticles in aqueous matrices using Response surface methodology. The surface frame of Si and SiC nanoparticles were comminuted by XRD, TEM, SEM, and BET. Experiments were steered well-found by Box-Behnken plan (BBD). Experiments of batch method were performed to prognosticate the reaction equilibrium of Aflatoxin B1 removal. The response surface methodological approach was used...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Zhiyang Qi, Yusheng Zhai, Long Wen, Qilong Wang, Qin Chen, Sami Iqbal, Guangdian Chen, Ji Xu, Yan Tu
Heterojunction between metal and silicon (Si) is an attractive route to extend the response of Si-based photodiodes into the near-infrared (NIR) region, so-called Schottky barrier diodes. Photons absorbed into a metallic nanostructure excite the surface plasmon resonances (SPRs), which can be damped non-radiatively through the creation of hot electrons. Unfortunately, quantum efficiency of hot electron detectors remains low due to low optical absorption and poor electron injection efficiency. In this study, we propose an efficient and low-cost plasmonic hot electron NIR photodetector based on Au nanoparticle (Au NP)-decorated Si pyramid Schottky junction...
May 22, 2017: Nanotechnology
Patrick V Almeida, Mohammad-Ali Shahbazi, Alexandra Correia, Ermei Mäkilä, Marianna Kemell, Jarno Salonen, Jouni Hirvonen, Hélder A Santos
AIM: To evaluate the chemotherapeutic potential of a novel multifunctional nanocomposite encapsulating both porous silicon (PSi) and gold (Au) nanoparticles in a polymeric nanocomplex. MATERIALS & METHODS: The nanocomposite was physicochemically characterized and evaluated in vitro for biocompatibility, cellular internalization, endosomolytic properties, cytoplasmatic drug delivery and chemotherapeutic efficacy. RESULTS: The nanocomposites were successfully produced and exhibited adequate physicochemical properties and superior in vitro cyto- and hemocompatibilities...
May 19, 2017: Nanomedicine
Tianhua Feng, Yi Xu, Wei Zhang, Andrey E Miroshnichenko
We introduce the concept of tunable ideal magnetic dipole scattering, where a nonmagnetic nanoparticle scatters light as a pure magnetic dipole. High refractive index subwavelength nanoparticles usually support both electric and magnetic dipole responses. Thus, to achieve ideal magnetic dipole scattering one has to suppress the electric dipole response. Such a possibility was recently demonstrated for the so-called anapole mode, which is associated with zero electric dipole scattering. By spectrally overlapping the magnetic dipole resonance with the anapole mode, we achieve ideal magnetic dipole scattering in the far field with tunable strong scattering resonances in the near infrared spectrum...
April 28, 2017: Physical Review Letters
Fan Wu, Tingting Xu, Guangyao Zhao, Shuangshuang Meng, Mimi Wan, Bo Chi, Chun Mao, Jian Shen
Silicone catheter has been widely used in peritoneal dialysis. The research missions of improving blood compatibility and the ability of resisting bacterial adhesion of silicone catheter have been implemented for the biomedical requirements. However, most of modification methods of surface modification were only able to develop the blood-contacting biomaterials with good hemocompatibility. It is difficult for the biomaterials to resist bacterial adhesion. Here, agarose was selected to resist bacterial adhesion, and heparin was chosen to improve hemocompatibility of materials...
May 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Sandrine Quignard, Thibaud Coradin, Jonathan J Powell, Ravin Jugdaohsingh
There is good evidence that certain silicon-containing materials promote would healing and their common feature is the delivery of orthosilicic acid (Si(OH)4) either directly or following metabolism. In this respect, amorphous silica nanoparticles (NP), which dissolve in aqueous environments releasing up to 2mM orthosilicic acid, may be appropriate 'slow release' vehicles for bioactive silicon. Here we studied the impact of silica NP suspensions (primary particles∼10nm) in undersaturated conditions (below 2mM Si) with differing degrees of surface charge and dissolution rate on human dermal fibroblasts (CCD-25SK cells) viability, proliferation and migration in a cellular wound model...
April 24, 2017: Colloids and Surfaces. B, Biointerfaces
Brandon Bonham, Gregory Guisbiers
Silicon-germanium is an important alloy mainly used in thermoelectricity and electronics. However, its thermal and optical properties still need further investigation at the nanoscale. That is why in this study, the size and shape effect on the silicon-germanium phase diagram is investigated through the nano-thermodynamics methodology. As expected, the phase diagram undergoes a shift down in temperature when the size decreases. However, it is demonstrated and explained why the size effect on the solidus-liquidus curves is much stronger than the one on the miscibility gap...
May 11, 2017: Nanotechnology
Hongyan Zhang, Jie Lv, Zhenhong Jia
A novel assembled biosensor was prepared for detecting 16S rRNA, a small-size persistent specific for Actinobacteria. The mechanism of the porous silicon (PS) photonic crystal biosensor is based on the fluorescence resonance energy transfer (FRET) between quantum dots (QDs) and gold nanoparticles (AuNPs) through DNA hybridization, where QDs act as an emission donor and AuNPs serve as a fluorescence quencher. Results showed that the photoluminescence (PL) intensity of PS photonic crystal was drastically increased when the QDs-conjugated probe DNA was adhered to the PS layer by surface modification using a standard cross-link chemistry method...
May 10, 2017: Sensors
Jing Liu, Yong Zhao, Wei Ge, Pengfei Zhang, Xinqi Liu, Weidong Zhang, Yanan Hao, Shuai Yu, Lan Li, Meiqiang Chu, Lingjiang Min, Hongfu Zhang, Wei Shen
The impacts of zinc oxide nanoparticles on embryonic development following oocyte stage exposure are unknown and the underlying mechanisms are sparsely understood. In the current investigation, intact nanoparticles were detected in ovarian tissue in vivo and cultured cells in vitro under zinc oxide nanoparticles treatment. Zinc oxide nanoparticles exposure during the oocyte stage inhibited embryonic development. Notably, in vitro culture data closely matched in vivo embryonic data, in that the impairments caused by Zinc oxide nanoparticles treatment passed through cell generations; and both gamma-H2AX and NF-kappaB pathways were involved in zinc oxide nanoparticles caused embryo-toxicity...
April 21, 2017: Oncotarget
Chunlin Hu, Xinling Wang, Ping Huang, Zhen Zheng, Zhibiao Yang
Surface functional mesoporous silicon nanoparticles (MSNs) have been used widely as promosing materials for drug delivery. Herein, we reported a facile strategy to construct MSNs coated by enzyme-resposive polylysine-dopamine (PLDA) films through self-polymerization of dopamine derivative lysine-dopamine, in which the drug could be loaded and delivered efficiently. In details, RhB or DOX was used as a drug model and loaded in functional MSNs via one-pot procedure among MSNs, drug and lysine-dopamine (LDA) under basic condition...
May 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Tuğba Kotil, Cansu Akbulut, Nazan Deniz Yön
INTRODUCTION: Nanotechnology investigates materials at nanoscale level (0.1-100nm in diameter). There are many commercially nanoproducts such as silver, silicon, titanium, zinc, and gold. They are used in a variety of applications and released to the environment. Titanium dioxide (TiO2) is one of the most commonly used nanoparticles (NP). In this study, the ultrastructural effects of TiO2-NP on zebrafish testis tissue were evaluated. MATERIAL AND METHOD: Zebrafish were divided into four groups (N=60) as one control and 3 experimental groups (1mg/L, 2mg/L and 4mg/L TiO2)...
April 26, 2017: Micron: the International Research and Review Journal for Microscopy
Lucas R Johnstone, Ismael J Gomez, Haisheng Lin, Oluwatimilehin O Fadiran, Vincent W Chen, J Carson Meredith, Joseph W Perry
A simple solution processed layer-by-layer approach was used to immobilize metal nanoparticles (NP) on the surface of ragweed pollen exine to obtain multifunctional particles with significant surface-enhanced Raman scattering (SERS), two-photon excited fluorescence and enhanced adhesion properties. The rugged pollen exine was functionalized with an amine terminated silane and then treated with Ag or Ag@SiO2 NPs that were electrostatically attached to the exterior of the pollen by incubation in a NP solution of the appropriate pH...
May 8, 2017: ACS Applied Materials & Interfaces
Wen Cao, Yajing Zhou, Yingmei Niu, Xiaoli Zhu, Yuguo Song, Ruijun Guo
OBJECTIVES: The purposes of this study were to verify whether inhalable silicon dioxide (SiO2 ) nanoparticles could induce hepatic injury and to investigate the relationship between the exposure time and SiO2 nanoparticle dosage by using acoustic radiation force impulse imaging (ARFI). METHODS: A total of 72 rats were randomly separated into 9 groups with 8 in each: blank control group, 0.9% normal saline group, polyacrylate (PPE) group, 25%, 50%, and 100% SiO2 groups, and 25%, 50%, and 100% SiO2 /PPE groups with inhaled SiO2 nanoparticle concentrations similar to the SiO2 groups...
May 4, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
Arijit Bardhan Roy, Sonali Das, Avra Kundu, Chandan Banerjee, Nillohit Mukherjee
Herein, we report the fabrication of flexible solar cells based on a crystalline p-Si/n-ZnO heterostructure for the first time. An enhancement of ∼52% in the base efficiency was achieved by the application of spherical SiO2 nanoparticles as light trapping structures on the top. The use of ZnO not only offers a facile route of synthesis, but also provides an additional advantage of large band bending, leading to notable open circuit voltage and formation of an intermediate ultra-thin barrier layer of Zn2SiO4 for minimized carrier recombination...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
Stephen F Larner, Jonathan Wang, Jared Goodman, Megan B O'Donoghue Altman, Meiguo Xin, Kevin K W Wang
Laboratory and industrial production of various nanoparticles, single-walled nanotubes (SWNTs), fullerene (C60), cadmium selenide (CdSe) quantum dots, carbon black (CB), and dye-doped silica nanospheres (NSs), has greatly increased in the past 15 years. However, little research has been done to analyze the toxicity of these materials. With recent studies showing that nano-substances can cross the blood-brain barrier, we examined the neurotoxicity of these manufactured nanoparticles. By employing the rat PC-12 neuronal-like cell line as the basis for our studies, we were able to evaluate the toxicity caused by these five nanoparticles...
2017: Journal of Cell Death
Brittany E Givens, Nina D Diklich, Jennifer Fiegel, Vicki H Grassian
Bovine serum albumin (BSA) adsorbed on amorphous silicon dioxide (SiO2) nanoparticles was studied as a function of pH across the range of 2 to 8. Aggregation, surface charge, surface coverage, and protein structure were investigated over this entire pH range. SiO2 nanoparticle aggregation is found to depend upon pH and differs in the presence of adsorbed BSA. For SiO2 nanoparticles truncated with hydroxyl groups, the largest aggregates were observed at pH 3, close to the isoelectric point of SiO2 nanoparticles, whereas for SiO2 nanoparticles with adsorbed BSA, the aggregate size was the greatest at pH 3...
May 3, 2017: Biointerphases
Reuben M Bakker, Ye Feng Yu, Ramón Paniagua-Domínguez, Boris Luk'yanchuk, Arseniy I Kuznetsov
Subwavelength confined waveguiding is experimentally demonstrated with high refractive index dielectric nanoparticles with photon energy propagation at distances beyond 500 μm. These particles have naturally occurring electric and magnetic dipole resonances. When they are placed in a 1D chain, the magnetic resonances of adjacent elements couple to each other, providing a means to transport energy at visible or NIR wavelengths in a confined mode. Chains of nanoparticles made of silicon were fabricated and guided waves were measured with near-field scanning optical microscopy...
May 8, 2017: Nano Letters
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