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https://www.readbyqxmd.com/read/28447779/performance-and-mechanism-of-piezo-catalytic-degradation-of-4-chlorophenol-finding-of-effective-piezo-dechlorination
#1
Shenyu Lan, Jinxi Feng, Ya Xiong, Shuanghong Tian, Shengwei Liu, Lingjun Kong
Piezo-catalysis was first used to degrade a non-dye pollutant, 4-chlorophenol (4-CP). In this process, hydrothermally synthesized tetragonal BaTiO3 nano/micrometer-sized particles were used as the piezo-catalyst and the ultrasonic irradiation with low frequency was selected as the vibration energy to cause the deformation of tetragonal BaTiO3. It was found that the piezoelectric potential from the deformation could not only successfully degrade 4-chlorophenol, but also effectively make it dechlorination at the same time...
April 27, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28442741/polarization-conversion-when-focusing-cylindrically-polarized-vortex-beams
#2
Alexey P Porfirev, Andrey V Ustinov, Svetlana N Khonina
Currently, cylindrical beams with radial or azimuthal polarization are being used successfully for the optical manipulation of micro- and nano-particles as well as in microscopy, lithography, nonlinear optics, materials processing, and telecommunication applications. The creation of these laser beams is carried out using segmented polarizing plates, subwavelength gratings, interference, or light modulators. Here, we demonstrate the conversion of cylindrically polarized laser beams from a radial to an azimuthal polarization, or vice versa, by introducing a higher-order vortex phase singularity...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28441712/virus-based-devices-prospects-for-allopoiesis
#3
Bogdan Dragnea
The assembly line is a commonly invoked example of allopoiesis, the process whereby a system produces a different system than itself. In this sense, virus production in plants is an instance of bio-enabled bottom-up allopoiesis because the plant host can be regarded as a programmable assembly line for the virus. Reprogramming this assembly line and integrating it into a larger lineup of chemical manipulations has seen a flurry of activity recently, with more sophisticated systems emerging every year. The field of virus nanomaterials now has several subdisciplines that focus on virus shells as assemblers, scaffolds for molecular circuitry, chemical reactors, magnetic and photonic beacons, and therapeutic carriers...
April 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28441504/paradoxical-long-timespan-opening-of-the-hole-in-self-supported-water-films-of-nanometrical-thickness
#4
Zahava Barkay, Edward Bormashenko
Opening of holes in self-supported thin (nano-scaled) water films has been in situ investigated with the environmental scanning electron microscope. Opening of a hole occurs within a two-stage process. At the first stage the rim surrounding a hole is formed, resembling the process which is observed under puncturing of soap bubbles. At the second stage the exponential growth of the hole is observed, with a characteristic time of a dozen of seconds. We explain the exponential kinetics of holes' growth by the balance between inertia (gravity) and viscous dissipation...
April 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28440967/toxicity-of-cisplatin-loaded-poly-butyl-cyanoacrylate-nanoparticles-in-a-brain-cancer-cell-line-anionic-polymerization-results
#5
Nejad Mohamadi, S Maryam Kazemi, Mahshid Mohammadian, Attabak Toofani Milani, Younes Moradi, Maryam Yasemi, Meysam Ebrahimi far, Maral Mazloumi Tabrizi, Hasan Ebrahimi Shahmabadi, Azim Akbarzadeh Khiyavi
Cancer is one of the most important issues in modern medicine and the most common cause of death after cardiovascular diseases in many countries. Brain cancer is one of the most common causes of cancer death among men and women, ranking third. Chemotherapeutic drugs that aim to prevent uncontrolled proliferation of cells in tissues of the body and induce apoptosis of tumor cells are prominent candidates for development. Since cisplatin has an apoptosisinducing role, it is widely used as an anticancer agent...
March 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28440838/detection-and-sizing-of-nanoparticles-and-dna-on-pdms-nanofluidic-chips-based-on-differential-resistive-pulse-sensing
#6
Ran Peng, Dongqing Li
The RPS (Resistive Pulse Sensing) technique is a popular tool for the label-free detection of particles. This paper describes a simple, cost-effective PDMS nanofluidic chip for the detection and characterization of nanoparticles based on the differential RPS technique with high resolution and sensitivity. The chip is composed of two layers of PDMS slabs. Microchannel systems fabricated by the photolithography method on the top layer are used for sample loading and differential signal acquisition, and a straight nanochannel on the bottom layer fabricated by an unconventional approach bridging the gap between the microchannels works as an RPS sensing gate...
April 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28440384/theoretical-and-numerical-analysis-of-nano-actuators-based-on-grafted-polyelectrolytes-in-an-electric-field
#7
N V Brilliantov, Yu A Budkov, C Seidel
We analyze, theoretically and by means of molecular dynamics (MD) simulations, the generation of mechanical force by a polyelectrolyte (PE) chain grafted to a plane and exposed to an external electric field; the free end of the chain is linked to a deformable target body. Varying the field, one can alter the length of the non-adsorbed (bulk) part of the chain and hence the deformation of the target body and the arising force. We focus on the impact of added salt on the magnitude of the generated force, which is especially important for applications...
April 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28437610/long-acting-release-formulation-of-exendin-4-based-on-biomimetic-mineralization-for-type-2-diabetes-therapy
#8
Wei Chen, Guohao Wang, Bryant C Yung, Gang Liu, Zhiyong Qian, Xiaoyuan Chen
Exendin-4 has been clinically exploited for treating type 2 diabetes, but the short circulation half-life and multiple daily injections limit its widespread application with respect to poor patient compliance, low efficacy, and high treatment cost. In this study, a potent long-acting release system based on biomimetic mineralization was constructed for biocompatible and sustained exendin-4 delivery. Similar to natural biomineralization, exendin-4 can be mineralized to form nanosized mineral solids by means of the reaction between acidic amino acid residues and calcium ions in a supersaturated environment with negligible influence on peptide bioactivity...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28436920/hybrid-3d-printing-and-electrodeposition-approach-for-controllable-3d-alginate-hydrogel-formation
#9
Wanfeng Shang, Yanting Liu, Wenfeng Wan, Chengzhi Hu, Zeyang Liu, Chin To Wong, Toshio Fukuda, Yajing Shen
Calcium alginate hydrogel is one of the most widely used biocompatible materials in biomedical and tissue engineering. This paper reports a hybrid 3D printing and electrodeposition approach to form the 3D calcium alginate hydrogel in a controllable manner. Firstly, a specific 3D printing system is developed by combining a 3D printer and a customized ejection syringe. Then, the mixed solution (1% w/v sodium alginate and 0.25% w/v CaCO3 nano particles) is filled in the syringe and ejected out from the nozzle to the substrate continuously...
April 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28435623/influence-of-nano-structured-alumina-coating-on-shear-bond-strength-between-y-tzp-ceramic-and-various-dual-cured-resin-cements
#10
Jung-Jin Lee, Jung-Yun Choi, Jae-Min Seo
PURPOSE: The purpose of this study was to evaluate the effect of nano-structured alumina surface coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements. MATERIALS AND METHODS: A total of 90 disk-shaped zirconia specimens (HASS CO., Gangneung, Korea) were divided into three groups by surface treatment method: (1) airborne particle abrasion, (2) tribochemicalsilica coating, and (3) nano-structured alumina coating. Each group was categorized into three subgroups of ten specimens and bonded with three different types of dual-cured resin cements...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435077/improving-blend-content-uniformity-via-dry-particle-coating-of-micronized-drug-powders
#11
Zhonghui Huang, Wannan Xiong, Kuriakose Kunnath, Sayani Bhaumik, Rajesh N Davé
Content uniformity of low dose blends with fine active pharmaceutical ingredients (API) is adversely impacted due to API agglomeration caused by high powder cohesion. Dry coating using high-intensity vibratory mixing is employed to reduce API cohesion and granular Bond number as well as agglomeration as predicted by contact models, hence improve blend content uniformity (CU). Micronized acetaminophen (mAPAP) (~10μm), a model API, was dry coated with nano-silica R972P (20nm), and mixed with Avicel 102. The amount of silica was varied from 0 to 2...
April 20, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28432501/high-scale-yield-of-nano-hydroxyapatite-through-combination-of-mechanical-activation-and-chemical-dispersion
#12
Xueling Gao, Chunchu Dai, Weiwei Liu, Yumei Liu, Ru Shen, Xiaotong Zheng, Ke Duan, Jie Weng, Shuxin Qu
The aim of this study is to develop a simple, convenient and effective approach to synthesize nano-sized hydroxyapatite (nano-HA) at high-scale yield. Nano-HA was wet synthesized in the presence or absence of alendronate sodium (ALN), one of bisphosphonates for anti-osteoporotic. Then aged and washed nano-HA precipitate was directly treated by mechanical activation combined with the chemical dispersion of ALN to prevent the agglomeration of nano-HA. ALN acted not only as a chemical dispersant but also as an orthopedic drug...
June 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28431810/in-vivo-ameliorative-effect-of-cerium-oxide-nanoparticles-in-isoproterenol-induced-cardiac-toxicity
#13
Shereen S El Shaer, Taher A Salaheldin, Nashwa M Saied, Sally M Abdelazim
BACKGROUND: Cerium oxide nanoparticles have gained much more attention especially in the field of nanomedicine. This work represents cerium oxide nanoparticles as a new prophylactic model for heart failure progression. OBJECTIVE: To investigate the potential protective effect of cerium oxide nanoparticles on Isoproterenol (ISO)-induced cardiac toxicity in rats. METHODS: Cerium oxide nanoparticles (5±1nm) were synthesized by reverse micelle method and characterized using High Resolution Transmission Electron Microscopy, X-Ray Diffraction and particle size analyzer...
April 18, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28431331/dielectric-properties-of-a-novel-colloidal-oral-matrix-drug-carrier
#14
Alexander Vol, Orna Gribova, Oded Shamir, Evgeniya Levy, Paul Ben Ishai, Anna Greenbaum Gutina, Yuri Feldman
Dielectric Spectroscopy (DS) was employed to study a novel oral matrix carrier (OMC), composed from silica nano-particles, polysaccharides, biopolymers and natural oils. This composition self-orders to a multi hierarchal structure and as such is amenable to be studied by techniques such as DS. The dielectric properties were measured in the frequency range 1MHz-1GHz and a temperature range 10°C-45°C. The results were dominated by two relaxation processes following CC relaxation and having relaxation times that are Arrhenius in nature...
April 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28430275/concave-gold-bipyramids-bound-with-multiple-high-index-facets-improved-raman-and-catalytic-activities
#15
Xiaolin Kang, Qifeng Ruan, Han Zhang, Feng Bao, Jun Guo, Minghua Tang, Si Cheng, Jianfang Wang
Concave nanocrystals usually exhibit a large electromagnetic-field enhancement and superior catalytic performance due to their sharp corners, negative curvature and high-index facets. Conventional gold bipyramids (AuBPs) possess intriguing plasmonic properties which are attractive for various applications while the surface curvature of the reported bipyramids has not been fine-tuned to concave or convex structures to date. Additionally, the longitudinal surface plasmon resonance (LSPR) wavelengths of conventional AuBPs are mostly located in the range of 650-1350 nm and the sizes of these nanoparticles are usually not beyond 350 nm, which are not facilitated to some nano-focusing and nanophotonic applications...
April 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28429293/topical-delivery-of-fenoprofen-calcium-via-elastic-nano-vesicular-spanlastics-optimization-using-experimental-design-and-in-vivo-evaluation
#16
Dalia Ali Farghaly, Ahmed A Aboelwafa, Manal Y Hamza, Magdy I Mohamed
The aim of this study was to investigate the potential of surfactant-based nanovesicular system (spanlastics) for topical delivery of fenoprofen calcium (FPCa) to eliminate its oral gastrointestinal adverse effects. FPCa-loaded spanlastics were prepared by thin film hydration (TFH) technique according to a full factorial design to investigate the influence of formulation variables on the drug entrapment efficiency (%EE), particle size (PS), deformability index (DI), and the % drug released after 24 h through the cellulose membrane (Q24h) using Design-Expert® software...
April 20, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28427648/sonochemical-synthesis-characterization-and-effects-of-temperature-power-ultrasound-and-reaction-time-on-the-morphological-properties-of-two-new-nanostructured-mercury-ii-coordination-supramolecule-compounds
#17
Payam Hayati, Ali Reza Rezvani, Ali Morsali, Daniel Ruiz Molina, Samira Geravand, Salvio Suarez-Garcia, Miguel Angel Moreno Villaecija, S García-Granda, Rafael Mendoza-Meroño, Pascal Retailleau
Two new mercury(II) coordination supramolecular compounds (CSCs) (1D and 0D), [Hg(L)(I)2]n (1) and [Hg2(L')2(SCN)2]·2H2O (2) (L=2-amino-4-methylpyridine and L'=2,6-pyridinedicarboxlic acid), have been synthesized under different experimental conditions. Micrometric crystals (bulk) or nano-sized materials have been obtained depending on using the branch tube method or sonochemical irradiation. All materials have been characterized by field emission scanning electron microscope (FESEM), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and FT-IR spectroscopy...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427619/application-of-sonochemical-technique-for-sustainable-surface-modification-of-polyester-fibers-resulting-in-durable-nano-sonofinishing
#18
Tina Harifi, Majid Montazer
In this study firstly we aimed at introducing the effects of ultrasound and sonochemistry in surface modification of polyester fibers. For this purpose, surface modification of polyester fibers was achieved by ultrasound, and contact angle and water spreading time measurements were used to confirm the treatment efficiency. Hydroxylation of terephthalate was occurred by hydroxyl radicals formed during water sonolysis, forming functional groups on polyester surface, as confirmed by XPS analysis, improving the wettability...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28427443/benserazide-a-dopadecarboxylase-inhibitor-suppresses-tumor-growth-by-targeting-hexokinase-2
#19
Wei Li, Mengzhu Zheng, Shuangping Wu, Suyu Gao, Mei Yang, Zhimei Li, Qiuxia Min, Weiguang Sun, Lixia Chen, Guangya Xiang, Hua Li
BACKGROUND: Hexokinase (HK) is the rate-limiting enzyme in the first reaction of glycolysis. And Hexokinase 2 (HK2) is most closely related to malignant tumor which expresses at higher level compared with normal cells. HK2 plays a pivotal role in tumor initiation and maintenance, which provides a new target for cancer therapy. METHODS: Structure-based virtual ligand screening was used in hit identification from ZINC Drug Database. Microscale thermophoresis assay was performed to evaluate the binding affinity...
April 20, 2017: Journal of Experimental & Clinical Cancer Research: CR
https://www.readbyqxmd.com/read/28426077/robust-raspberry-like-metallo-dielectric-nanoclusters-of-critical-sizes-as-sers-substrates
#20
A Le Beulze, S Gomez-Graña, H Gehan, S Mornet, S Ravaine, M Correa-Duarte, L Guerrini, R A Alvarez-Puebla, E Duguet, E Pertreux, A Crut, P Maioli, F Vallée, N Del Fatti, O Ersen, M Treguer-Delapierre
Raspberry-like nano-objects made of large plasmonic satellites (>10 nm) covering a central dielectric particle have many potential applications as photonic materials, superlenses and (bio-) sensors, but their synthesis remains challenging. Herein, we show how to build stable and robust raspberry-like nano-systems with close-packed satellites, by combining monodisperse silica particles (80 or 100 nm diameter) and oppositely charged noble metal nanoparticles (Au or Ag) with well-defined sizes (10-50 nm). The spectral characteristics of their associated plasmonic resonances (wavelength, linewidth, extinction cross-section) and the electromagnetic coupling between satellites were observed using the spatial modulation spectroscopy technique and interpreted through a numerical model...
April 20, 2017: Nanoscale
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