Suspensions and Colloids

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Solutions
● Solubility
● Dissolving substances in water
● Suspensions and Colloids
● Smog – A Suspension
● Types of Colloids
● The Tyndall Effect
● Properties of colloid solutions
● Heterogenous (rough) dispersion
● Emulsions
● Types of Emulsion
● Multiple Emulsions
● Emulsion Size
● Number Distributions
● Chemical Composition
● Emulsion Destabilization
● Creaming
● Flocculation and Coalescence
● Rheology of Flocculated Emulsions
● Emulsion Viscosity
● Emulsions and Emulsifier
● Emulsions
● Emulsions (Oil in water, O/W)
● Emulsifiers
● Foams
● Dilute Foams
● Concentrated Foams
● Foam Drainage

نوع زبان: انگلیسی حجم: 6.26 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 85 صفحه
سطح مطلب: نامشخص پسوند فایل: pptx
گروه موضوعی: زمان استخراج مطلب: 2019/06/05 09:30:21

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

., liquid, solid, colloid, particle, solution, water, gas, suspension, –, dispersion, hydrophobic,

توجه: این مطلب در تاریخ 2019/06/05 09:30:21 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: ., liquid, solid, colloid, particle, solution, water, gas, suspension, –, dispersion, hydrophobic,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

suspensions and colloids suspensions heterogeneous mixtures relatively large particles e.g. whole blood many medicines shake well before using classes of solutions true solutions suspensions colloidal solutions colloids and suspensions are heterogeneous mixtures solutions a solution is a homogenous mixture composed of two or more substances. a solute is dissolved in another substance known as a solvent. types of solutions solvent is gas mixture of different gases solvent is liquid gas in liquid water solution of hcl liquid in liquid h۲so۴ in the water solid in liquid glucose nacl in the water solvent is solid – alloys like bronze cu and sn solubility the ability of one compound to dissolve in another compound miscible liquids liquid is able to completely dissolve in another liquid ethanol water . the solubility of a given solute in a given solvent typically depends on temperature solubility of ionic compounds there is a limit to how much salt can be dissolved in a given volume of water solubility dissolving substances in water no electrolytes do not interact with the solvent oxygen sucrose . electrolytes interact with molecules of the solvent → dissociate ionize the ions are then surrounded by solvent molecules h۲o . hydrated ions then arise. colloids colloids are mixtures of a solvent and suspended particles. particles are too small to see but are larger than molecules. due to their small size they do not settle out of solution. there are several types of colloid aerosol gas liquid or solid e.g. fog and smoke foam liquid gas e.g. whipped cream emulsion liquid liquid e.g. milk sol liquid solid e.g. paint solid foam solid gas e.g. marshmallow solid emulsion solid liquid e.g. butter solid sol solid solid e.g. pearl opal . types of colloids dispersed phase continuous phase name gas liquid foam gas solid foam liquid gas aerosol liquid liquid emulsion liquid solid gel solid gas aerosol solid liquid sol solid solid solid sol brownian motion tyndall effect reflection and light scattering coagulation peptization dialysis properties physical state of ingredients in food systems food dispersions ۱. true solution ۲. colloidal dispersion ۳. emulsion ۴. foam ۵. gel dispersions ۱. continuous phase ۲. dispersed phase may be solid liquid or gas. true solution the dispersion of particle ۱ nm in liquid. examples sugar lactose minerals and vitamins. colloidal dispersion sol dispersion of particle sizes between ۱ ۱ nm in liquid. common colloids dispersion of proteins large molecular salts. example milk. suspensions and colloids suspensions and colloids are not solutions. suspensions the particles are so large that they settle out of the solvent if not constantly stirred. colloids the particle is intermediate in size between those of a suspension and those of a solution. smog – a suspension types of colloids examples dispersing medium dispersed substance colloid type fog aerosol sprays gas liquid aerosol smoke airborne bacteria gas solid aerosol whipped cream soap suds liquid gas foam milk mayonnaise liquid liquid emulsion paint clays gelatin liquid solid sol marshmallow styrofoam solid gas solid foam butter cheese solid liquid solid emulsion ruby glass solid solid solid sol the tyndall effect colloids scatter light making a beam visible. solutions do not scatter light. which glass contains a colloid solution colloid removal of colloidal particles colloid particles are too small to be separated by physical means e.g. filtration . colloid particles are coagulated enlarged until they can be removed by filtration. methods of coagulation heating colloid particles move and are attracted to each other when they collide adding an electrolyte neutralize the surface charges on the colloid particles . dialysis using a semipermeable membranes separate ions from colloidal particles. hydrophilic hydrophobic colloids focus on colloids in water. water loving colloids hydrophilic. water hating colloids hydrophobic. molecules arrange themselves so that hydrophobic portions are oriented towards each other. if a large hydrophobic macromolecule giant molecule needs to exist in water e.g. in a cell hydrophobic molecules embed themselves into the macromolecule leaving the hydrophilic ends to interact with water. hydrophilic and hydrophobic colloids most dirt stains on people and clothing are oil based. soaps are molecules with long hydrophobic tails and hydrophilic heads that remove dirt by stabilizing the colloid in water. bile excretes substances like sodium stereate that forms an emulsion with fats in our small intestine. emulsifying agents help form an emulsion. hydrophilic and hydrophobic colloids sodium stearate has a long hydrophobic tail ch۳ ch۲ ۱۶ and a small hydrophobic head co۲ na . the hydrophobic tail can be absorbed into the oil drop leaving the hydrophilic head on the surface. the hydrophilic heads then interact with the water and the oil drop is stabilized in water. particle sizes become larger all particles are on particles of at least one particles of at least the order of atoms component are large one component ions or small clusters of atoms ions may be individually molecules .۱ ۱ nm or small molecules or seen with a low are very large ions or power microscope molecules ۱ ۱ nm over ۱ nm most stable to gravity less stable to gravity unstable to gravity most homogeneous also homogeneous homogeneous only but borderline if well stirred solutions colloidal dispersions suspensions transparent but often translucent or often opaque but often colored opaque but may be may appear translucent transparent no tyndall effect tyndall effect not applicable suspensions cannot be transparent no brownian brownian movement particles separate unless movement system is stirred cannot be separated cannot be separated can be separated by by filtration by filtration filtration solutions colloidal dispersions suspensions homogeneous ———— to ———— heterogeneous —— properties of colloid solutions colloids are everywhere in the human body washing powder soup tooth paste etc. many foods yogurt butter milk nanotechnologies are based on chemistry of colloids heterogenous rough dispersion suspension heterogeneous fluid containing solid particles that are sufficiently large for sedimentation. particle size is ۱ mm dispersion is made by mechanical agitation sand in the water . aerosol a suspension of liquid droplets or a suspension of fine solid particles in a gas. example smoke air pollution smog etc. heterogenous rough dispersion emulsion a mixture of two or more immiscible liquids one liquid the dispersed phase is dispersed in the other the continuous phase . prepared by shaking – oil water milk water oil butter . emulsions stable coloidal system in which both phases are liquids water and oil miscible liquid form a solution lyophobic colloids form an emulsion emulsifying agent …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: ., liquid, solid, colloid, particle, solution, water, gas, suspension, –, dispersion, hydrophobic,

این فایل پاورپوینت شامل 85 اسلاید و به زبان انگلیسی و حجم آن 6.26 مگا بایت است. نوع قالب فایل pptx بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/05 09:30:21 استخراج شده است.

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