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奈米高分子核殼複合粒子為一種分散材料尺寸小於1奈米的無機物補強高分子性質的複合核殼粒子，由於大的無機材料分散相表面積和高分子複合粒子間有強烈的吸引力，使得此種高分子複合粒子比原始高分子在剛性性質上大幅提昇，體阻氣性、熱膨脹係數下降，且較耐溶劑腐蝕與其他材料結合性高，粒子分層性高等優越特性。由於它有上述的優異性，所以可以被廣泛的應用在一般民生工業上，如資電器材、汽車零組件、絕緣性高、耐油性材料與耐磨耗材料；在纖工業上，如工業刷毛、濾布、繩索，具有提昇剛性、強度、耐溫、防導電性、熱性；在包裝材料上應用，如保鮮膜、生鮮食品包裝，充分利用奈米材料耐熱性、防氧化化阻性透明特性等；在塗布工業，材料耐黃變、高附著性、防蝕、、防日曬高、防鏽性高、電著塗料均是未來奈米阻絕性之最佳應用、生醫科技可應用在表面清潔、防臭防腐處理。

導電粒子主要中心物質為熱固型或熱塑型高分子材質，並且在中心粒子之表面進行表面處理與附著奈米金屬材料，以利表面金屬化或稀有元素之步驟製程奈米核殼粒子。粒徑可製成0.5~4μm也可製程導體與非導體、研磨粒子等相關應用。

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Bewise Inc. www.tool-tool.com Reference source from the internet.

The chemical compound silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with a chemical formula of SiO2 and has been known for its hardness since antiquity. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. Silica is the most abundant mineral in the Earth's crust.[1][2]

Silica is manufactured in several forms including glass, crystal, gel, aerogel, fumed silica (or pyrogenic silica), and colloidal silica (e.g. Aerosil). In addition, Silica Nanosprings are produced by the vapor-liquid-solid method at temperatures as low as room temperature.[3]

Silica is used primarily in the production of window glass, drinking glasses and beverage bottles. The majority of optical fibers for telecommunications are also made from silica. It is a primary raw material for many whiteware ceramics such as earthenware, stoneware and porcelain, as well as industrial Portland cement.

Silica is common additive in the production of foods, where it is used primarily as a flow agent in powdered foods, or to absorb water in hygroscopic applications. It is the primary component of diatomaceous earth which has many uses ranging from filtration to insect control. It is also the primary component of rice husk ash which is used, for example, in filtration and cement manufacturing.

Thin films of silica grown on silicon wafers via thermal oxidation methods can be quite beneficial in microelectronics, where they act as electric insulators with high chemical stability. In electrical applications, it can protect the silicon, store charge, block current, and even act as a controlled pathway to limit current flow.

Silica is used as a raw material for aerogel in the Stardust spacecraft. It is also used in the extraction of DNA and RNA due to its ability to bind to the nucleic acids under the presence of chaotropes. As hydrophobic silica it is used as a defoamer component. In hydrated form, it is used in toothpaste as a hard abrasive to remove tooth plaque.

In its capacity as a refractory, it is useful in fiber form as a high-temperature thermal protection fabric. In cosmetics, it is useful for its light-diffusing properties and natural absorbency. Colloidal silica is used as a wine and juice fining agent. In pharmaceutical products, silica aids powder flow when tablets are formed. Finally, it is used as a thermal enhancement compound in ground source heat pump industry.


Crystal structure


Tetrahedral structural unit of silica (SiO2), the basic building block of the most ideal glass former.

In the vast majority of silicates, the Si atom shows tetrahedral coordination, with 4 oxygen atoms surrounding a central Si atom. The most common example is seen in the quartz crystalline form of silica SiO2. In each of the most thermodynamically stable crystalline forms of silica, on average, only 2 out of 4 of each the vertices (or oxygen atoms) of the SiO4 tetrahedra are shared with others, yielding the net chemical formula: SiO2.[4]



The amorphous structure of glassy silica (SiO2) in two-dimensions. No long-range order is present, however there is local ordering with respect to the tetrahedral arrangement of oxygen (O) atoms around the silicon (Si) atoms. Note that a fourth oxygen atom is bonded to each silicon atom, either behind the plane of the screen or in front of it; these atoms are omitted for clarity.

For example, in the unit cell of alpha-quartz, the central tetrahedron shares all 4 of its corner O atoms, the 2 face-centered tetrahedra share 2 of their corner O atoms, and the 4 edge-centered terahedra share just 1 of their O atoms with other SiO4 tetrahedra. This leaves a net average of 12 out of 24 (or 1 out of 2) total vertices for that portion of the 7 SiO4 tetrahedra which are considered to be a part of the unit cell for silica (see 3-D Unit Cell).

SiO2 has a number of distinct crystalline forms in addition to amorphous forms. With the exception of stishovite and fibrous silica, all of the crystalline forms involve tetrahedral SiO4 units linked together by shared vertices in different arrangements. Silicon-oxygen bond lengths vary between the different crystal forms, for example in α-quartz the bond length is 161 pm, whereas in α-tridymite it is in the range 154–171 pm. The Si-O-Si angle also varies between a low value of 140° in α-tridymite, up to 180° in β-tridymite. In α-quartz the Si-O-Si angle is 144°.[5]

Fibrous silica has a structure similar to that of SiS2 with chains of edge-sharing SiO4 tetrahedra. Stishovite, the highest pressure form, in contrast has a rutile like structure where silicon is 6 coordinate. The density of stishovite is 4.287 g/cm3, which compares to α-quartz, the densest of the low pressure forms, which has a density of 2.648 g/cm3.[6] The difference in density can be ascribed to the increase in coordination as the six shortest Si-O bond lengths in stishovite (four Si-O bond lengths of 176 pm and two others of 181 pm) are greater than the Si-O bond length (161 pm) in α-quartz. [7] The change in the coordination increases the ionicity of the Si-O bond. [8] But more important is the observation that any deviations from these standard parameters constitute microstructural differences or variations which represent an approach to an amorphous, vitreous or glassy solid.

Note that the only stable form under normal conditions is α-quartz and this is the form in which crystalline silicon dioxide is usually encountered. In nature impurities in crystalline α-quartz can give rise to colours (see list).

Note also that both high temperature minerals, cristobalite and tridymite, have both a lower density and index of refraction than quartz. Since the composition is identical, the reason for the discrepancies must be in the increased spacing in the high temperature minerals. As is common with many substances, the higher the temperature the farther apart the atoms due to the increased vibration energy.

The high pressure minerals, stishovite and coesite, on the other hand, have a higher density and index of refraction when compared to quartz. This is probably due to the intense compression of the atoms that must occur during their formation, resulting in a more condensed structure.

Faujasite silica is another form of crystalline silica. It is obtained by dealumination of a low-sodium, ultra-stable Y zeolite with a combined acid and thermal treatment. The resulting product contains over 99% silica, has high crystallinity and high surface area (over 800 m2/g). Faujasite-silica has very high thermal and acid stability. For example, it maintains a high degree of long-range molecular order (or crystallinity) even after boiling in concentrated hydrochloric acid.[9]Crystalline forms of SiO2[5]

Form
Crystal symmetry
Pearson symbol, group, No
Notes
Structure

α-quartz
rhombohedral (trigonal)
hP9, P3121 No.152[10]
Helical chains making individual single crystals optically active; α-quartz converts to β-quartz at 573 °C


β-quartz
hexagonal
hP18, P6222, No.180[11]
closely related to α-quartz (with an Si-O-Si angle of 155°) and optically active; β-quartz converts to β-tridymite at 870 °C


α-tridymite
orthorhombic
oS24, C2221, No.20[12]
metastable form under normal pressure


β-tridymite
hexagonal
hP12, P63/mmc, No. 194[12]
closely related to α-tridymite; β-tridymite converts to β-cristobalite at 1470 °C


α-cristobalite
tetragonal
tP12, P41212, No. 92[13]
metastable form under normal pressure


β-cristobalite
cubic
cF104, Fd3m, No.227[14]
closely related to α-cristobalite; melts at 1705 °C


keatite
tetragonal
tP36, P41212, No. 92[15]
Si5O10, Si4O14, Si8O16 rings; synthesised from amorphous silica and alkali at high pressure


coesite
monoclinic
mS48, C2/c, No.15[16]
Si4O8 and Si8O16 rings; high pressure form (higher than keatite)


stishovite
tetragonal
tP6, P42/mnm, No.136[17]
rutile like with 6-fold coordinated Si; high pressure form (higher than coesite) and the densest of the polymorphs


melanophlogite
cubic
cP*, P4232, No.208[18]
Si5O10, Si6O12 rings; mineral always found with hydrocarbons in interstitial spaces-a clathrasil[19]

fibrous
orthorhombic
oI12, Ibam, No.72[20]
like SiS2 consisting of edge sharing chains


faujasite
cubic
cF576, Fd3m, No.227[21]
sodalite cages connected by hexagonal prisms; 12-membered ring pore opening; faujasite structure.[9]




Molten silica exhibits several peculiar physical characteristics that are similar to the ones observed in liquid water: negative temperature expansion, density maximum and a heat capacity minimum.[22] When molecular silicon monoxide, SiO, is condensed in an argon matrix cooled with helium along with oxygen atoms generated by microwave discharge, molecular SiO2 is produced which has a linear structure. Dimeric silicon dioxide, (SiO2)2 has been prepared by reacting O2 with matrix isolated dimeric silicon monoxide, (Si2O2). In dimeric silicon dioxide there are two oxygen atoms bridging between the silicon atoms with an Si-O-Si angle of 94° and bond length of 164.6 pm and the terminal Si-O bond length is 150.2 pm. The Si-O bond length is 148.3 pm which compares with the length of 161 pm in α-quartz. The bond energy is estimated at 621.7 kJ/mol.[23]

Quartz glass
Main article: Glass

When silicon dioxide SiO2 is cooled rapidly enough, it does not crystallize but solidifies as a glass. The glass transition temperature of pure SiO2 is about 1600 K.

Chemistry


Manufactured silica fume at maximum surface area of 380 m2/g

Silicon dioxide is formed when silicon is exposed to oxygen (or air). A very thin layer (approximately 1 nm or 10 Å) of so-called 'native oxide' is formed on the surface when silicon is exposed to air under ambient conditions. Higher temperatures and alternative environments are used to grow well-controlled layers of silicon dioxide on silicon, for example at temperatures between 600 and 1200 °C, using the so-called "dry" or "wet" oxidation with O2 or H2O, respectively.[24] The thickness of the layer of silicon replaced by the dioxide is 44% of the thickness of the silicon dioxide layer produced.[24]

Alternative methods used to deposit a layer of SiO2 include[25]

Low temperature oxidation (400–450 °C) of silane
SiH4 + 2 O2 → SiO2 + 2 H2O

Decomposition of tetraethyl orthosilicate (TEOS) at 680–730 °C
Si(OC2H5)4 → SiO2 + 2 H2O + 4 C2H4

Plasma enhanced chemical vapor deposition using TEOS at about 400 °C
Si(OC2H5)4 + 12 O2 → SiO2 + 10 H2O + 8 CO2

Polymerization of tetraethyl orthosilicate (TEOS) at below 100 °C using amino acid as catalyst.[26]
Pyrogenic silica (sometimes called fumed silica or silica fume), which is a very fine particulate form of silicon dioxide, is prepared by burning SiCl4 in an oxygen rich hydrocarbon flame to produce a "smoke" of SiO2:[6]

SiCl4 + 2 H2 + O2 → SiO2 + 4 HCl

Amorphous silica, silica gel, is produced by the acidification of solutions of sodium silicate to produce a gelatinous precipitate that is then washed and then dehydrated to produce colorless microporous silica.[6]

Quartz exhibits a maximum solubility in water at temperatures about 340 °C.[27] This property is used to grow single crystals of quartz in a hydrothermal process where natural quartz is dissolved in superheated water in a pressure vessel which is cooler at the top. Crystals of 0.5–1 kg can be grown over a period of 1–2 months.[5] These crystals are a source of very pure quartz for use in electronic applications.[6]

Fluorine reacts with silicon dioxide to form SiF4 and O2 whereas the other halogen gases (Cl2, Br2, I2) react much less readily.[6]

Silicon dioxide is attacked by hydrofluoric acid (HF) to produce "hexafluorosilicic acid":[5]

SiO2 + 6 HF → H2SiF6 + 2 H2O

HF is used to remove or pattern silicon dioxide in the semiconductor industry.

Silicon dioxide dissolves in hot concentrated alkali or fused hydroxide:[6]

SiO2 + 2 NaOH → Na2SiO3 + H2O

Silicon dioxide reacts with basic metal oxides (e.g. sodium oxide, potassium oxide, lead(II) oxide, zinc oxide or mixtures of oxides forming silicates and glasses as the Si-O-Si bonds in silica are broken successively).[5] As an example the reaction of sodium oxide and SiO2 can produce sodium orthosilicate, sodium silicate and glasses, depending on the proportions of reactants:[6]

2 Na2O + SiO2 → Na4SiO4

Na2O + SiO2 → Na2SiO3

(0.25–0.8)Na2O + SiO2 → glass

Examples of such glasses have commercial significance e.g. soda lime glass, borosilicate glass, lead glass. In these glasses, silica is termed the network former or lattice former.[5]



Bundle of optical fibers composed of high purity silica.

With silicon at high temperatures gaseous SiO is produced:[5]

SiO2 + Si → 2 SiO (gas)

Sol-gel
The sol-gel process is a wet chemical technique used for the fabrication of both glassy and ceramic materials. In this process, the sol (or solution) evolves gradually towards the formation of a gel-like network containing both a liquid phase and a solid phase. The basic structure or morphology of the solid phase can range anywhere from discrete colloidal particles to continuous chain-like polymer networks.[28][29]

The term “colloid” is specific to the size of the individual particles, which are larger than atoms but small enough not to settle to the bottom of a container immediately. If the particles are large enough, then their dynamic behavior would be governed by forces of gravity and sedimentation. But if they are small enough to be colloids, then they may remain suspended in a liquid medium indefinitely. This critical size range (or particle diameter) typically ranges from tens of angstroms to a few microns.

1) In basic solutions (pH > 7), the particles may grow to sufficient size to become colloids, which are affected both by sedimentation and forces of gravity. Particles like these may become highly ordered in a manner similar to those seen in precious opal.

2) Under acidic conditions (pH < 7), a more open continuous network of chain-like polymers is formed. Polymers like this can be useful due to their viscosity, which allows them to be drawn or spun from solution into fibers, or drawn as thin films into surface coatings. Such glass fiber is useful for guided lightwave transmission, with ceramic fiber providing excellent thermal insulation.



Silica fiber mesh for thermal insulation.

In either case, the sol evolves towards the formation of a 2-phase gel. In the case of the colloid, the number of particles in an extremely dilute suspension may be so low that a significant amount of solvent may need to be removed initially for the gel-like properties to be recognized. This can be accomplished in any number of ways. The simplest method is to allow time for sedimentation to occur, and then pour off the remaining liquid. A variable speed centrifuge can also be used to accelerate the process of liquid removal.

Removal of the remaining liquid (solvent) phase requires a drying process, which is typically accompanied by a significant amount of shrinkage and densification. Since the remaining water will most likely reside within microstructural pores, the rate at which the solvent can be removed is ultimately determined by the distribution of pore space in the gel. Subsequent thermal treatment (or low temperature sintering at 500 – 600 °C) may be performed in order to obtain a higher density product. With regard to methods of application:

1) The sol can be deposited on a substrate to form a film using dip-coating or spin-coating;

2) It can be cast into a suitable container with the desired shape;

3) It can be used to synthesize fine high-purity powders.[30][31]

The sol-gel approach is a cheap and low-temperature technique that maintains a high degree of chemical purity. Thus it allows for total control of the product’s chemical composition. It can be used in ceramics manufacturing processes, as an investment casting material, or as a means of producing thin films or coatings.[32]

Sol-gel derived components have diverse applications in optics, electronics, energy, space, physical and chemical sensors, biosensors, controlled drug release in medicine, and chemical separation on a cellular level. Ceramic powders of a wide range of chemical composition can be formed by such techniques. The generation of particles uniform in size and shape was investigated extensively by Egon Matijevic and his co-workers. In the case of chromium, aluminum and titanium salts, spherical particles were formed whereas particles of crystallographic symmetry resulted from solutions of copper and iron salts.[30][33][34][35][36][37][38][39]

In 1956, Kolbe described the formation of spherical silica particles in basic solution. The mechanisms of precipitation—and the chemical conditions that bias the structure toward linear or branched structures—are the most critical issues faced in the chemistry laboratory by sol-gel scientists. Again, these are the factors which will ultimately determine the form of the microstructure over a range of length scales in the green or unfired body. Factors, such as chemical acidity which lead to the formation of linear polymers (as opposed to particles), are ideal for the formation of spinnable solutions such as those used for the formation of thin films and coatings as well as optical quality fiber.



Sand from Pismo Beach, California including quartz, shell and rock fragments.

Biomaterials
Silicification is quite common in the biological world and occurs in bacteria, single-celled organisms, plants, and animals (invertebrates and vertebrates). Crystalline minerals formed in this environment often show exceptional physical properties (e.g. strength, hardness, fracture toughness) and tend to form hierarchical structures that exhibit microstructural order over a range of length or spatial scales. The minerals are crystallized from an environment that is undersaturated with respect to silicon, and under conditions of neutral pH and low temperature (0–40 °C). Formation of the mineral may occur either within or outside of the cell wall of an organism, and specific biochemical reactions for mineral deposition exist that include lipids, proteins and carbohydrates.

Health effects


Quartz sand (silica) as main raw material for commercial glass production

Inhaling finely divided crystalline silica dust in very small quantities (OSHA allows 0.1 mg/m3) over time can lead to silicosis, bronchitis or (much more rarely) cancer, as the dust becomes lodged in the lungs and continuously irritates them, reducing lung capacities (silica does not dissolve over time). This effect can be an occupational hazard for people working with sandblasting equipment, products that contain powdered crystalline silica and so on. Children, asthmatics of any age, allergy sufferers and the elderly (all of whom have reduced lung capacity) can be affected in much shorter periods of time. Amorphous silica, such as fumed silica is not associated with development of silicosis.[40] Laws restricting silica exposure with respect to the silicosis hazard specify that the silica is both crystalline and dust-forming.

In respects other than inhalation, pure silicon dioxide is inert and harmless. Because some silicas take on water, extended exposure may cause local drying of the skin or other tissue. Pure silicon dioxide produces no fumes and is insoluble in vivo. (in the body) It is indigestible, with zero nutritional value and zero toxicity.[citation needed] When silica is ingested orally, it passes unchanged through the gastrointestinal (GI) tract, exiting in the feces, leaving no trace behind.[citation needed] Small pieces of silicon dioxide are equally harmless[citation needed], as long as they are not large enough to mechanically obstruct the GI tract, or jagged enough to lacerate its lining.

A study which followed subjects for 15 years found that higher levels of silica in water appeared to decrease the risk of dementia. The study found that for every 10 milligram-per-day intake of silica in drinking water, the risk of dementia dropped by 11%.[


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弊社の製品の供給調達機能は：

（１）生活 産業～ハイテク工業までのエンド・ミル設計

（２）ミクロ・エンド・ミル～大型エンド・ミル供給

（３）小Ｌｏｔ生産～大量 発注対応供給

（４）オートメーション整備調達

（５）スポット対応～流れ生産対応

弊社の全般供給体制及び 技術自慢の総合専門製造メーカーに貴方のご体験を御待ちしております。

Bewise Inc. talaşlı imalat sanayinde en fazla kullanılan ve üç eksende (x,y,z) talaş kaldırabilen freze takımlarından olan Parmak Freze imalatçısıdır. Çok geniş ürün yelpazesine sahip olan firmanın başlıca ürünlerini Karbür Parmak Frezeler, Kalıpçı Frezeleri, Kaba Talaş Frezeleri, Konik Alın Frezeler, Köşe Radyüs Frezeler, İki Ağızlı Kısa ve Uzun Küresel Frezeler, İç Bükey Frezeler vb. şeklinde sıralayabiliriz.

BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт www.tool-tool.com для получения большей информации.

BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web www.tool-tool.com for more info