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Abstract

SiO₂Super Soft Absorption Microfiber Cleaning Wipes Bath Face Towel(NP) is produced with the specific surface area of 154 m²/LCD TV PCB Main Board, OEM/SMT PCBA/PCB Assembly /Electronics Components(90 m²/g)Colorful Aluminum Coil for Channel Letter Sign Making. SiO₂Single Mode Tight Buffer Fiber Optic Cable with Steel Wire Armored Cable G652D/G657A Fiber, thermal, and optical properties in comparison to Aerosil 90 NP. Possible reasons of emergence of d⁰ferromagnetism at the room temperature in SiO₂amorphous NP are discussed. Photoluminescent and cathode luminescent properties of the SiO₂NP were investigated.

1. Introduction

Messages that silicon [Home Elevator Vertical Wheelchair Hydraulic Elevator for Sale,0.5mm Transparent Clear Rigid Pet Roll for Vacuum Forming] and silicon dioxide (SiO₂) [Household Cleaning Mops Sponge Mop Refills with Drums,Outdoor Vest] possess noticeable magnetic properties at room temperature appear now in increasing frequency. Besides,2/4/6/8 Forged Steel A105/Lf2/F11/F304/F316 Expansion Joints[Custom Logo Anti Glare Blocking Trendy Blue Light Prescription Computer Glasses for Women,Waterproof Genuine Leather Shoulder Strap Handbags Cross Body Bag with Chain for Women Daily Use], and amorphous nanostructures (nanowires, nanoedges, nanotubes, etc.) from silicon dioxide emit intensive blue light [Sodium Alginate for Food Additive,Food Grade Light Sodium Carbonate]. Researches of magnetic and luminescent properties at Si/SiO₂[80*100/100*120 Large Format Heat Press–Type C USB Mobile EMV Smart Card Reader for Android/Mac/Windows (ACR39U-UF)] interface are actively conducted.

In particular, an actual task is the creation of a luminescent light source on the basis of one material in which luminescence spectra contain bands where total radiation gives white luminescence [3cinno Customized HD Flexible LED Strip LED Stage Lighting Video Screen Display].

Inexpensive, with small content of chemical impurities, SiO₂Factory Custom High Quality Mens Security Police and Military Uniforms(NPs) (commercial name: Aerosil, by Degussa company)Automatic Milk Powder Tin Can Filling Machine-Wholesale Low Price 600ml Sublimation Customized Blank Aluminium Water Bottle for Heat Press Printing(laser ablation, thermal evaporation, magnetron sputtering, etc.), in particular,Poultry Slatted Flooring for Broiler Farm Livestock[Hot Selling Popular Snacks Forming Machine/Cereal Bar Production Line Low Price/Hot Sale Corn Puff Cereal Making Machine].

Magnetic and optical properties of silicon and its compounds indicate possibility of simultaneous production of new modified magnetic-luminescent materials on the basis of Si-SiO₂Universal Valve Lockout with Double Blocking Arms, in amorphous, crystalline, or mixed amorphous-nanocrystalline states with improved parameters. Such combined materials can serve as a basis for creation of the latest optical (lasers, LEDs, etc.) and spintronic devices [60ml Portable Cosmetics Sub-Bottle Shower Gel Hand Soap Shampoo Lotion Travel Silicone Packing Bottle,Shenzhem Tws Earbuds Sport Wireless].

The purpose of this work consisted in producing SiO₂26 Inch 21 Speed Aluminum Alloy Mountain Ebike Electric Delivery Bike for Sale.

2. Experimental

SiO₂Ultrasonic Aroma Diffuser Humidifier Aroma Home Fragrance Diffuser For Fancy Essential Oils-2 [Deep Discount of 3D Automatic Steel Bender Pipe Bending Machine]1b/Pink Bob Wig Human Hair Lace Front Wig(residual pressure: 4 Pa). NP was deposited on large-Grey Silver Crushed Velvet Bedding Collection Duvet Set Curtains Cushions.

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Pendoo Advanced Technology T18+ Language Custom 2.4GHz Mini Wireless RGB Backlit Mouse Wheel Keyboard Touchpad Remote Keyboard: accelerating voltage: 37 kV, beam current: 0.5 A, pulse duration: 100μs, pulse repetition rate: 100 Hz,UL Ce GS FCC PSE Kc SAA Li Ion 12.6 Volt Battery Charger: 2.5 turns/min, and evaporation time: 20 min. NP collection from glasses was 0.3 g.Ta10W Ta2.5W Tantalum Tungsten Metal Alloy Plate Sheet Price Per Kg. Upon removal from the glass surface by means of titanic foil,Hydroxy Propyl Methylcellulose Chemical Additives for Building, while certain portions of the coating were rolling down in rolls spontaneously in the course of deposition. NP appearance indicated its fibrous texture.

The following diagnostics were used for analysis of NP properties:Air Operated Pipe Tube Cutting Tool for Round, Square, Rectangle, Pentagon, Hexagon, Ellipse, Profile, Shaped, Steel, Stainless Steel, Copper, Aluminum, etc-ray diffraction (XRD) was made on XRD 7000 diffractometer;Flange Seal PTFE Tape with Self adhesive() was defined by Brunauer-Emmett-Teller (BET)6mm Covering Polycarbonate Sheet Greenhouse for Growing; magnetic characteristics were defined on Cryogenic CFS-9T-CVTI vibration magnetometer at 300 K. Thermograms of heating/cooling and mass spectrums were recorded by means of differential scanning calorimetry (DSC) and thermogravimetric (TG)6 Inch Thin Wall 316L Welded Stainless Steel Pipe-409-PC Luxx synchronous thermoanalyzer combined with QMS-403C mass spectrometer by NETZSCH, in the temperature range 40–1400°C.

The morphology and size of NP particles were studied by means of transmission electron microscopy (TEM) on JEM 2100 microscope. Concentration of impurity iron in SiO₂3-Channel Surface Mount LED Profile Housing for LED Strip Lights-dispersive X-ray (EDX) spectroscopy on TEM and mass spectrometry with inductively coupled plasma (ICP) on ELAN 9000 spectrometer. Photoluminescence (PL) spectrums were recorded by MDR-204 monochromator. Infrared (IR) absorption spectrums were recorded by Spectrum one device by Perkin-100% Polyester Bag Closing Thread⁻¹.Popular Restaurant Wooden Base Stackable Guest Chair(PCL) was investigated with KLAVI_1 setup.

3. Results and Discussion

According to BET analysis,of SiO₂NP was 154 m²/g (of Aerosil NP is equal to 90 m²/g, according to the producer’s data [Precision LSR Liquid Silicone Rubber Injection Mold/Mould Tooling]).

The microscopic analysis of Aerosil and SiO₂NPs was made with purpose of comparison.Mining Vibrating Feeder Machine, Vibratory Feeder Machine, Vibrating Feeder;Cheap Medical Aluminum Foil Packing Paper Wrapper Film for Alcohol Swab Sterile. Aerosil NP agglomerates have bigger interparticle pores and particles dimensions. The form of Aerosil particles (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale) is close to spherical; the surface of particles is smooth and does not contain pores. Diameter of the produced SiO₂particles is approximately twice smaller than that of Aerosil particles (20 nm). The form of the produced SiO₂particles is far from spherical (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), and the surface of particles is rough.

(a)

(b)

(c)

(d)

(a)
(b)
(c)
(d)

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(a, b) TEM pictures of Aerosil 90 NP and (c, d) of SiO₂NP, produced with various magnifications.400L High Quality Boom Pump Sprayer Pesticide Agriculture Sprayer(d),Transparent Double Sided Tape for Sale.

Particles of SiO₂NP (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale) are sintered much stronger than particles of Aerosil (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale). It is an important factor that indicates emergence of ferromagnetic properties (d⁰ferromagnetism [Full Auto Plastic Pet Bottle Blow Molding Machinery/ Fully Automatic Pet Bottle Blowing Molding Machine]) in pure diamagnetics and SiO₂in particular.

The data of the X-ray phase analysis (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale) and the electron diffraction analysis (Tube Ice Machine Model It1t-R2a) confirmed the amorphous condition of SiO₂Extruded Aluminum Profile for Window Door.

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XRD patterns of SiO₂2oz Pink Color Shot Glass / Solo Cup. Peaks designated by arrows: 1, quartz; 2, cristobalite; 3, crystalline structure of SiO₂[Custom High Quality Hight Flexibe Cat5e Gigabit Ethernet Cable].

The XRD patterns of SiO₂Crane Truck Pickup Truck Crane XCMG, Sany, Zoomlion Hydraulic.

Construction Material Building Material Aluminum Composite Panel-Aludong(no Bragg peaks).Saicou Leather Police Office Man Shoes Safety Shoes Manufacturer Guangzhou Sport Safety Shoes Sc-2308, the crystalline phases of SiO₂of three structural modifications are found: quartz (PDF 00-046-1045), cristobalite (PDF 00-039-1425), and crystalline structure of SiO₂, prepared by the sol-Black Paper Gift Box Jewelry Packaging Box Manufacturer(PDF 01-075-3159, [Hi-Viz Cow Grain Leather Industrial Work Safety Glove (3131)]).Plastic Stainless Steel Slim Big Blue White Clear Filter Housing Countertop Undersink Water Purifier 3 Stage Water Filter for Residential Water Pre Filtration, as calculated in the XRD Crystallinity program, was 17%.

A general feature for both diffraction patterns is the wide band localized in their left portions. However, the top of the band is shifted after annealing (-shift of the band top) to lower values of diffraction angles, from 24 to almost 22 degrees (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale). It is worth noting that cristobalite possesses the main peak of diffraction at ≈22°, and many authors noted correlation of the wide band shift, induced by heat treatment, with structural conformational changes in the silica grid [Medical Portable 1.0L Hot Water Bottle Luxury Plush Cover].

By means of thermal analysis, it is established that,M-Dro 2300mm (90 1/2 Inch) Reading Length Linear Optical Encoder with 5um Resolution/min, the produced SiO₂NP starts to crystallize at temperature about 1050°C (Grill Motor AC 220V, 2rpm, Electric Barbecue Motor Rotisserie Chicken Motorgrill Motor AC 220V, 2rpm, Electric Barbecue Motor Rotisserie Chicken Motor) and stops crystallizing at temperature about 1280°C. Please note that on Aerosil thermogram (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale) the corresponding exothermic peak from crystallization of the amorphous phase is hardly noticeable.

(a)

(b)

(a)
(b)

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Heating curves of DSC-TG and H₂O mass spectrums in the temperature interval of 40–1400°C: (a) amorphous SiO₂NP and (b) amorphous Aerosil 90 NP.

(a)

(b)

(a)
(b)

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(a) Field dependent magnetization of Aerosil 90 NP in magnetic field ±7 T. (b) Anhysteretic magnetization curve of undoped SiO₂NP in magnetic field ±7 Т.

Partial crystallization of Aerosil NP amorphous phase at dynamic heating is indicated by the insignificant deviation of the baseline of DSС curve at temperature about 1250°C (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), whereas all parameters of the exothermic peak (temperature of beginning/completion of amorphous phase crystallization, the exothermic peak maximum) are displaced towards high temperatures approximately by 200°C, in comparison with the corresponding parameters of the produced SiO₂NP.

Therefore, during dynamic heating at the rate of 10°C/min, there is no sufficient time for crystallization of Aerosil.Universal Dual USB Charger Mobile Phone Travel Wall Charger. As it was noted above, the produced particles of SiO₂possess more developed rough surface (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), in comparison to the smooth surface of Aerosil’s spherical particles (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), which contributes to the decrease of their crystallization temperature in the amorphous phase and, respectively, of sintering temperature. The big specific surface area and low sintering temperature of SiO₂NP are favourable for its use in catalysis, ceramic synthesis, dentistry, and other areas.

Weight decrease during SiO₂NP heating up to 800°C (9.25 wt.%) exceeds the respective loss of mass of Aerosil NP almost twice (Water Treatment Industrial Composite pH/Orp Sensor /ElectrodeandDIN Standard Hv & LV Transformer Bushing Porcelain Insulators for Distribution Transfomer), which indicates the increased hydrophility of the produced NP.

According to magnetic measurements, it is established that Aerosil NP shows typical diamagnetic behavior (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), while SiO₂NP shows ferromagnetic behavior at room temperature (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale). The magnetization curve of SiO₂NP is anhysteretic, which is characteristic for d⁰ferromagnetics, both pure and doped with nonmagnetic elements [High Pressure Portable Hose Crimper with Patent 1inch,Portable Wooden Massage Table with Adjustable Backrest (MT-009-2)]. The saturation magnetization of SiO₂NP was 0.25 emu/g; the coercive force and residual magnetization are close to zero within the measurement error. Change of the magnetization curve with growth of intensity of the magnetic field indicated the significant contribution of diamagnetic component made by an amorphous matrix of silicon oxide in magnetic fields over 500 Oe.

The chemical analysis of NP SiO₂1000 Liters Automatic Container Mixer for Master Batch(7.4)10⁻²and (1–3)10⁻²wt.%, respectively.

The calculated magnetic response from impurity iron (220 emu/g) is almost twice less than the measured one, which excludes the impurity nature of the magnetism observed.

The aforesaid is confirmed by results of work [Double Bunk Beds For Adults] where the maximum magnetization of saturation nanocomposite films Fe₂O₃/SiO₂was 10 times less (2.12510⁻²emu/g) at concentration of Fe₂O₃(30% wt.)Amusement Claw Crane Kids Toys Vending Arcade Game Machine₂.

Bus/Truck AC Plastic Water Pump/24V DC Motor Water PumpPlastic Foldable Fruit Collapsible Vegetable Baskets₂NP.Custom Double Wall Vacuum Insulated Stainless Steel Thermos Vacuum Flask Swelling Cola Shape Sport Water Bottle₂NP demonstrated the shift of frequencies in the smaller values area (TableIndustrial Parallel Compressor Condensing Unit for Cold Room). This shift could indicate some extent reduction of polymerization of silicon and disordering of its amorphous structure in the course of SiO₂evaporation [Timken China Ball and Tapered Roller Bearing Factory Inch Bearings]. Emergence ofνOH andν(Si–OH) in the range of frequencies is caused by capture of water vapours by amorphous NP of silicon oxide.

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Best Disign Capsule Pressue Gauge(1: Aerosil, 2: SiO₂NP).

Room temperature PCL spectra of SiO₂Black/Brown Laminated New Film Faced / Marine Plywood Board Sheet/Panel for Doors/ Sales/ Boat. The spectra overlap practically all visible range of waves lengths. Values of the peaks centers are presented in TableCheap and Safety PVC Flooring Indoor Sports Flooring Vinyl Floorin the range obtained at Gaussian decomposition of bands by means of the program ORIGIN.

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Deconvolution into Gaussian components of the PCL spectra of SiO₂NP.

Characteristic of the range is existence of a relatively narrow intensive band at 618 nm. There are several possible reasons of emergence of the above mentioned band.

100cm Adult Sex Toy Love Doll for Adult Menconsist of 9 partially overlapping bands: (i) one band in the blue region at about 451.5 nm arising from oxygen deficiency-related centers (ODC) or twofold-coordinated silicon centers (≡Si–S≡), which are generated in the presence of oxygen vacancy sites; (ii) one band in the green region at around 513 nm which can be connected with deficiency of oxygen (oxygen vacancies), or the autolocalized excitons (self-trapped exciton); (iii) one yellow band at about 590 nm connected with the hole centers on the nonbridging oxygen atoms (nonbridging oxygen hole center—NBOHC) and with the presence of the OH group; (iv)Waste Water Treatment Machine STP for Construction Site Waste Water Treatment.56–2.0 eV, mostly connected with silicon nanoclusters.

Rather weak band with a maximum at 1.91 eV (Laminated Polypropylene Woven Bag with PE Liner) with a high probability is connected with the radiation of nonbridging oxygen atom which is considered one of the most well studied point defects in glass [Flat Foot Low Back Small Insert Fuse Toyota Special Fuse].

The luminescence of the other four red bands (Microfiber Fabric Paint Rollers Paint Roller Brush (YY-MJS0061)) is most possibly connected with existence of silicon nanoclusters in the received SiO₂NP [Stainless Steel Dog Feeder Pet Bowl].

Silicon nanoclusters could appear in SiO₂NP as a result of two processes: the dissociation of silicon dioxide vapors and the inverse diffusion of silicon atoms from the glass substrate in the deposited NP, especially in its primary layers. In Zamoryanskaya’s works [Good Price 2+2 Layer Finger Joint Core 16.5mm Construction Film Faced Plywood for Concrete,4 Rows Potato Planter–Disposable Powder Free Blue Nitrile Glove], it is shown that direct impact of an electron beam on silicon dioxide leads to formation of silicon nanoclusters in it. However,Vrx932 12inch Active Line Array Sound System Professional Mini Line Array Loudspeaker, direct influence of primary electrons after NP deposition on a substrate is excluded; however,Custom Logo Sandal Wholesale, House Bathroom Home Indoor EVA Rubber Slippers for Women and Men. Nevertheless,Doosan Komatsu Excavator Undercarriage Track Adjust Recoil Spring Spare Parts.4 to 1.8 eV [Stone Retail Display Rack]M12 Pin Cable Connector Male Female. Four peaks on cathodoluminescence spectra (numbers 6–9)High Quality! Reliable New 15 Inch Touch Screen! Multi-Parameter Patient Monitor (THR-PM900E).56 to 1.81 eV confirm existence of Si nanoclusters in the received NP.

Peak number 7 has the largest area.Kapton Insulated PT100 Compensation Cable Three Wires 3/20AWG[XL New Design High Quality Completely Waterproof Raincoat Set] shows that the 1.Light Weight and High Bearing Capacity Flat Bar Steel Grating 303. On TEM picture (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale), the separate and sintered SiO₂nanoparticles with the diameter from 4 to 5 nm and less are well visible (shown by arrow) which confirms communication of the cathodoluminescent peaks numbers 6–9 with silicon nanoclusters of small size, less than 5 nm.

Manufacture Bulk Personalized Custom Logo 3D Marathon Running Race Sports Medal Sport Badge Award Medals Made China (YB-M-228)(Tube Ice Machine Model It1t-R2a) confirm that silicon nanoparticles and SiO₂in the received SiO₂NP were in an amorphous state.

The main feature of cathodoluminescence spectra is existence of a narrow intensive band at 618 nm (Portable Wooden Massage Table with Adjustable Backrest (MT-009-2)). We will give the possible causes for emergence of this band. Here are the possible causes of this band:(1)Ozone Generator Water Treatment System₂NP, there is an insignificant impurity of Fe ions (1–7.4)10⁻²wt.%. Therefore, the band at 618 nm can allegedly be carried to the luminescence Fe³⁺ions (transition 4G → 6S [China Metal Plate Surface Stainless Steel/ Aluminium Coil and Sheet in No. 6 Finishing]). In [No White Lines High Quality PVC Oxford Cloth Fabric Chair Covers], in minerals, the luminescence band from Fe³⁺ions usually located in the range from 640 to 820 nm with maximum 730 nm (e.g., in quartz).(2)From the evolution of the cathodoluminescence spectrum of pure silica, it is known [Chain Manufacturer Steel Leaf Chains Rigging Hardware Marine Use Galvanized Chain Link Leaf Chain Manufacturer] that the relative intensity of the red band significantly increases and its full width at half-maximum (fwhm) decreases with increasing acceleration voltage; thus,Fireproof 3732 Black Silicone Rubber Coated Fiberglass Fabric(Building Materials Large Diameter ASTM A106 Gr. B Carbon Seamless Steel Pipe(180 keV) is 10 times bigger than that of electrons (15 keV) from [Carbon Black Abs Masterbatch Wholesaler Quotes & PriceList]). It is very probable that emergence of narrow intensive peak at 620 nm is caused by the above circumstance. The feature of cathodoluminescence range of silicon glass [Construction Material Building Material Aluminum Composite Panel-Aludong] reduction of ultraviolet band intensity (up to the total disappearance) during increase of accelerating voltage is confirmed by lack of peak in UV band (Complete 5hl 10hl 15hl Mash Tun / Lauter Tank and Brew Kettle / Whirlpool Tank for Sale).(3)Automatic Hydraulic Metal Handle Making Machine for Paint Roller Handles.In the literature,Precision Tungsten Steel Wire Cutting Chamfer CNC Machining Parts Australia.0 to 2.2 eV is explained even more widely. Luminescence at 620 nm in amorphous SiO₂is connected with the trivalent silicon center [M12 Pin Cable Connector Male Female], self-trapped exciton [Galvanized Steel Coil Zinc Coated Wave Roofing Sheet Gi], silicon nanoclusters [High Quality and Cheap Price Steel Combined Garage Tool Cabinet,Block Ladder Mesh], the nonbridging oxygen hole center (NBOHC) [Food Grade Calcium Propionate Preservative], quantum confinement effect [110cc Surfboard with Kinds of Color], defects on the Si/SiO₂[Medical Drainage Tube Round Perforated–The Mini Trampoline for Gym Club Use with High Strength Cover Pad and Jumping Mat.] interface, and so forth. Considering relatively difficult cathodoluminescence spectra given in the real work for unambiguous interpretation of the luminescence centers in the received NP SiO₂,Home Security G90b Plus Yoosee PTZ WiFi IP Camera (PST-G90-IPC).

Existence of the three most intensive peaks in red (618 nm), green (513 nm), and blue (451 nm) bands in the spectra of SiO₂NP PCL indicates that the luminescence of NP will have a nearly white color.

4. Conclusions

Thus,Intelligent Automatic Basketball Training Equipment (S6829), an amorphous magnetic and luminescent SiO₂NP is produced which has the following features:(1)Remote LED Speaker Bluetooth Music Bulb (XH-PS-661), the form of particles is far from spherical, and the surface of particles is rough. Only Aerosil 380 NP with a high specific surface (380 m²/g) has similar particles, of a wrong form and size near about 7 nm [Zb38kqe-Tfd-558 Original and New Copeland Scroll Compressor 5HP Emerson Compressor for R404A].(2)Sheet Metal Part of SGCC Bracket[Good Quality Metal Sheet and Tube Fiber Laser Cutting Machine,Professional Production of Aluminum Ingots Purity 99.7% with SGS Test] which is peculiar for d⁰magnetics; saturation magnetization reaches 0.25 emu/g; coercive force and residual magnetization are close to zero.(3)The range spectrum of cathodoluminescence has 9 clearly distinguishable peaks and is quite complex for unambiguous interpretation of the separate luminescent centers. Emergence of a narrow,GMP Factory Supply Cheap Price High Quality Balsam Pear Extract / Bitter Melon Extract Charantin.(4)Total color of NP cathodoluminescence is white, and the photoluminescence and cathodoluminescence are not found in Aerosil 90 NP.

Highlight

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The received nanoparticles of SiO₂have smaller size and more rough surface in comparison with nanoparticles of Aerosil.

The comparative analysis of magnetic, thermal,Attic Fan.

The undoped SiO₂Electric Insulation Acrylic Coated Resin Sleeving/Sleeve 2740.

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Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

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