Abstract The use of silicon dioxide (SiO 2 ) nanosprings as supports for immobilized enzymes in a continuous microreactor is described. A nanospring mat (2.2 cm × 60 μm thick) was functionalized with γ‐aminopropyltriethoxysilane, then treated N ‐succinimidyl‐3‐(2‐pyridyldithio)‐propionate (SPDP) and dithiothreitol (DTT) to produce surface thiol (SH) groups. SPDP‐modified β‐galactosidase from Aspergillus oryzae on the thiolated by reversible disulfide linkages. enzyme‐coated placed into...

Commercially Pure Titanium foils, were irradiated using a pulsed Nd:YAG laser under ambient air, in order to produce and characterize well controlled surface texture (roughness waviness) that enhances osseointegration. To study the 'peri-implant' reparative process response, treated Ti foils implanted tibia of 10 male Wistar rats. At 14 days post-implantation, histological analysis showed tendency more bone formation compared untreated control implants. The layer TiN on obtained roughness,...

Silica nanosprings with large surface-to-volume ratios were coated noble metal nanoparticles (NPs) using chemical vapor deposition or chemisorption of presynthesized in situ synthesized nanoparticles. Chemisorption silver NPs onto amine-functionalized silica NS results particularly interesting materials small interparticle spacings and high surface-enhanced Raman scattering activity. SERS enhancement factors approaching ∼1010 observed thiophenol. In an alternative approach, core−shell...

Chemiresistors were constructed using 3-D silica nanospring mats coated with a contiguous film of ZnO nanocrystals. an average nanocrystal radius <3 nm, or >20 found to exhibit relative change in conductance factor 50 upon exposure gas flow 20% O2 and 80% N2 ∼500 ppm toluene operational temperature 400 °C. Samples 15 nm be the most responsive 1000. The addition metal nanoparticles (average equal 2.4 nm) onto surface nanocrystals produced 1500. For optimum conditions (T = °C,...

Chemiresistors (conductometric sensor) were fabricated on the basis of novel nanomaterials--silica nanosprings ALD coated with ZnO. The effects high temperature and UV illumination electronic gas sensing properties chemiresistors are reported. For thermally activated chemiresistors, a discrimination mechanism was developed an integrated sensor-array for simultaneous real-time resistance scans built. sensor response tested using linear discriminant analysis (LDA). distinguished signatures...

Self-assembled monolayers (SAMs) of thiols L-cysteine, 6-mercaptohexanol, 4-mercaptobenzoic acid, DL-thioctic acid and 11-(1-pyrenyl)-1-undecathiol, which have been selected for their propensity to interact with vaporized explosives, attached from solution onto gold decorated ZnO-coated nanosprings. X-ray ultraviolet photoelectron spectroscopies (XPS UPS) used investigate the surface electronic structure SAMs coated On basis XPS analysis, it has determined that packing densities...

The initial phases of amorphous silica nanospring formation via a vapor–liquid–solid mechanism are reported. low temperature eutectic Au–Si results in the an asymmetrical shaped catalyst at early stages formation. As solid is formed below system lowers its surface free energy and forms multiple nanowires beneath common catalyst, as opposed to single nanowire. diameter one forming ranges between 10–20 nm. difference growth rates individual creates asymmetry interfacial tension on boundaries...

Polyvinylidene fluoride (PVDF) presents highly useful piezo and pyro electric properties but they are predicated upon the processing methods ensuing volume fraction of β-phase. Production PVDF with higher β-phase content for additive manufacturing (AM) is particularly desirable because it can enable creation custom parts enhanced properties. Necessary steps from compounding to testing a 3D printed sensitive sensor presented in this paper. AM process variables influence zinc oxide (ZnO)...

In this work, the water condensation performance of methylated silica-nanospring (SN)-coated horizontal aluminum tubes is assessed. Coated samples with varying nanospring mat thicknesses, from 784 to 2902 nm, were studied, which exhibited static contact angles and CA hysteresis values 155° 16°, respectively. Dropwise increased droplet shedding observed on these coated tubes. Video analysis determined that 15 20 min SN growth times experienced an 84% increase in condensate removal rate over...

STUDY OBJECTIVE: Screening recommendations for colorectal cancer include sigmoidoscopy in asymptomatic, average risk persons aged 50 and over colonoscopy every three to five years high groups. Little is known about the eligible population's compliance with endoscopic screening. This first Italian report of an screening programme patients' relatives. DESIGN: In 1986, a pilot project by endoscopy subjects was started Desio (Milan, Italy) public health service region. The results obtained after...

As a promising industrial thermoplastic polymer material, high-density polyethylene (HDPE) possesses distinct properties of ease to process, good biocompatibility, high recyclability, etc. and has been widely used make packaging, prostheses implants, liquid-permeable membranes. Traditional manufacturing processes for HDPE, including injection molding, thermoforming, rotational require molds or post processing. In addition, part shapes are highly restricted., Thus, fused deposition modeling...

In this study, the initial phase of development a vertically aligned (silica) nanospring (VANS)-based sensor utilizing alternating current impedance spectroscopy is presented. The capacitor consisting two glass substrates coated with indium tin oxide, where VANS are grown on one substrate, following top-down approach, serving as dielectric spacer layer. sensitivity sensors was evaluated using deionized water (of an effective ≃ 10−3 mM monovalent ion concentration) and saline-phosphate (SP)...

In this study, alternating current impedance spectroscopic analysis of the biofunctionalization process a vertically-aligned (silica) nanosprings (VANS) surface is presented. The VANS functionalized with biotinylated immunoglobulin G (B-IgG) layer formed by physisorption B-IgG from solution phase. Bovine serum albumin passivation reduces additional adsorption blocking potential sites weak bond formation via electrostatic and hydrophobic interactions. As avidin acts as receptor compounds,...

Thin non-perfluoroalkoxy superhydrophobic coatings are desirable for heat exchangers because of their lower thermal resistance and reduced environmental concerns. Coatings requirements must also include robustness longevity facilitate high defrosting rates in refrigeration applications to warrant adoption use. Methyl-functionalized silica nanosprings (SN) possess water droplet static contact angles above 160° with angle hysteresis values as low 6.9° a sub-micrometer-thick coating. The methyl...

Silica nanosprings (NSs) consisting of multiple nanowires intertwined were demonstrated to reversibly store 0.85 wt% hydrogen at 20 bar and room temperature. X-ray photoelectron spectroscopy indicates a mixed 3+–4+ ionization state the silicon atoms partially explains enhanced surface adsorption H2 relative other forms silica. Theoretical modeling simulation using Lennard-Jones potential that interstitial sites between silica forming NS are energetically more favorable single nanowires. The...

Detecting microbial life in extraterrestrial locations is a goal of space exploration because ecological and health concerns about possible contamination other planets with earthly organisms, vice versa. Previously we suggested method for detection based on the fact that living entities require continual input energy accessed through coupled oxidations reductions (an electron transport chain). We demonstrated using soils identification extracted components chains useful remote chemical...

The growth efficiency of one-dimension (1D) nanostructures via the vapor-liquid-solid process is commonly attributed to parameters such as precursor vapor pressure, substrate temperature, and choice catalyst. work presented herein an investigation use silica nanosprings (SNs) a 3D for improving SN themselves. SNs are 1D nanomaterial that form nonwoven structure with optimal geometric characteristics surface properties mitigate collisions between growing ripening gold catalyst, which should...

Abstract In this work, an atomic layer deposition (ALD) system is used to identify conditions resulting in anisotropic growth and the formation of highly defined polycrystalline anatase titanium dioxide. FESEM, Raman Spectroscopy, XRD were extensively characterize deposited titania. The ALD parameter refinement resulted attainment a phase titania as low 30 cycles, although final pulsed-chemical vapor (pulsed-CVD). This work suggests that crystal phase’s development more dependent on process...

In this work, we present an industrial cold walled Atomic Layer Deposition (ALD) system, which can be controlled by either a traditional programmable logic controller (PLC) system or field-programmable gate array (FPGA) prototyping board. This work presents FPGA that takes ladder diagram (LD) control for PLC and converts to Verilog HDL programs such the board is used real application. We explore approach since implementation of LD could significantly reduce cost implementing these...