I-Nanotechnology kunye neNanomaterials: I-Nanometer Titanium Dioxide kwi-Sunscreen Cosmetics

I-Nanotechnology kunye neNanomaterials: I-Nanometer Titanium Dioxide kwi-Sunscreen Cosmetics

Caphula amagama

Malunga ne-5% yemitha yelanga enemitha ye-ultraviolet ene-wavelength ≤400 nm. Imitha ye-Ultraviolet ekukhanyeni kwelanga inokwahlulwa ibe: imitha ye-ultraviolet yamaza amade enobude obuyi-320 nm~400 nm, ebizwa ngokuba yi-A-type ultraviolet ray (UVA); Imitha ye-ultraviolet yamaza aphakathi enobude obungama-290 nm ukuya kuma-320 nm ibizwa ngokuba yimitha ye-ultraviolet yohlobo lwe-B (UVB) kunye nemitha ye-ultraviolet yamaza amafutshane enobude obungama-200 nm ukuya kuma-290 nm ibizwa ngokuba yimitha ye-ultraviolet yohlobo lwe-C.

Ngenxa yobude bayo obufutshane namandla amakhulu, imitha ye<em>ultraviolet inamandla amakhulu okonakalisa, anokonakalisa ulusu lwabantu, ibangele ukudumba okanye ukutshiswa lilanga, ize ivelise ngokunzulu umhlaza wolusu. I-UVB yeyona nto ibangela ukudumba kwesikhumba kunye nokutshiswa lilanga.

1. umgaqo wokukhusela imisebe ye-ultraviolet nge-nano TiO2

I-TiO _ 2 luhlobo lwe-N-semiconductor. Uhlobo lwekristale lwe-nano-TiO _ 2 olusetyenziswa kwizithambiso ze-sunscreen lutile ngokubanzi, kwaye ububanzi bebhendi obungavumelekanga yi-3.0 eV Xa imitha ye-UV enobude obungaphantsi kwe-400nm irradiate TiO _ 2, ii-electron kwi-valence band zinokufunxa imitha ye-UV kwaye ibe nemincili ibhendi yokuqhuba, kunye neeperile ze-electron-hole ziveliswa ngexesha elinye, ngoko i-TiO _ 2 inomsebenzi wokufunxa imitha ye-UV. Ngobukhulu bamasuntswana amancinci kunye namaqhezu amaninzi, oku kwandisa kakhulu amathuba okuthintela okanye ukuthintela imitha ye-ultraviolet.

2. Iimpawu ze-nano-TiO2 kwi-cosmetics ye-sunscreen

2.1

Ukusebenza okuphezulu kwe-UV yokukhusela

Amandla okukhusela i-ultraviolet yezithambiso ze-sunscreen abonakaliswa yi-sun protection factor (ixabiso le-SPF), kwaye xa liphezulu ixabiso le-SPF, ngcono i-sunscreen effect. Umlinganiselo wamandla afunekayo ukuvelisa elona rhashalala lisezantsi linokubonwa kwisikhumba esiqatywe ngeemveliso zesunscreen kumandla afunekayo ukuvelisa i-erythema yeqondo elifanayo eluswini ngaphandle kweemveliso zesunscreen.

Njengoko i-nano-TiO2 ifunxa kwaye isasaza imitha ye-ultraviolet, ithathwa njengeyona nto ifanelekileyo yokukhusela ilanga ekhaya nakwamanye amazwe. Ngokubanzi, amandla e-nano-TiO2 ukukhusela i-UVB ngama-3-4 amaxesha e-nano-ZnO.

2.2

Uluhlu lobungakanani besuntswana elifanelekileyo

Ikhono lokukhusela i-ultraviolet ye-nano-TiO2 igqitywe ngokukwazi kwayo ukufunxa kunye nokukwazi ukusabalalisa. Ubuncinci ubungakanani bamasuntswana oqobo we-nano-TiO2, kokukhona komelele amandla okufunxa yi-ultraviolet. Ngokomthetho kaRayleigh wokusasazwa kokukhanya, kukho ubungakanani obufanelekileyo bamasuntswana obuninzi bokukwazi ukusasazeka kwe-nano-TiO2 kwimitha ye-ultraviolet enamaza ahlukeneyo. Iimvavanyo zikwabonisa ukuba ubude bobude bemitha ye-ultraviolet,Ikhono lokukhusela le-nano-TiO 2 lixhomekeke ngakumbi kubuchule bayo bokusasaza; Okukhona ubude bamaza bufutshane, kokukhona ukukhusela kwayo kuxhomekeke kubuchule bayo bokufunxa.

2.3

I-dispersibility egqwesileyo kunye nokungafihli

Ubungakanani bokuqala be-particle ye-nano-TiO2 bungaphantsi kwe-100 nm, ingaphantsi kakhulu kunobude bokukhanya okubonakalayo. Ngokwethiyori, i-nano-TiO2 inokudlulisa ukukhanya okubonakalayo xa ihlakazwe ngokupheleleyo, ngoko iyabonakala. Ngenxa yokucaca kwe-nano-TiO2, ayiyi kugquma ulusu xa ifakwe kwizinto zokuthambisa zelanga. Ngoko ke, inokubonisa ubuhle besikhumba bendalo.Ukucaca ngenye yezalathisi ezibalulekileyo ze-nano-TiO2 kwi-cosmetics ye-sunscreen. Ngapha koko, i-nano-TiO 2 ibonakala elubala kodwa ayicacanga ngokupheleleyo kwizithambiso zelanga, kuba i-nano-TiO2 inamasuntswana amancinane, indawo enkulu yendawo ethile kunye namandla angaphezulu aphezulu, kwaye kulula ukwenza i-aggregates, ngaloo ndlela ichaphazela ukusasazeka kunye nokungafihli. iimveliso.

2.4

Ukumelana nemozulu elungileyo

I-Nano-TiO 2 yezithambiso ze-sunscreen idinga ukuchasana kwemozulu ethile (ingakumbi ukuchasana nokukhanya). Ngenxa yokuba i-nano-TiO2 inamasuntswana amancinci kunye nomsebenzi ophezulu, iya kuvelisa izibini ze-electron-hole emva kokufunxa imitha ye-ultraviolet, kwaye ezinye izibini ze-electron-hole ziya kufudukela phezulu, ezikhokelela kwi-athomu ye-oxygen kunye ne-hydroxyl radicals emanzini adsorbed phezu komhlaba. I-nano-TiO2, ene-oxidation enamandla.Iya kubangela ukubola kweemveliso kunye nevumba ngenxa yokubola kweziqholo. Ngoko ke, enye okanye ngaphezulu kwezinto ezicacileyo zokuzihlukanisa, ezifana ne-silica, i-alumina kunye ne-zirconia, kufuneka ifakwe phezu kwe-nano-TiO2 ukuvimbela umsebenzi wayo we-photochemical.

3. Iintlobo kunye neendlela zophuhliso lwe-nano-TiO2

3.1

I-Nano-TiO2 powder

Iimveliso ze-nano-TiO2 zithengiswa ngendlela yepowder eqinile, enokuthi ihlulwe ibe yi-hydrophilic powder kunye ne-lipophilic powder ngokwezakhiwo ze-nano-TiO2. I-Hydrophilic powder isetyenziselwa izimonyo ezisekelwe emanzini, ngelixa i-lipophilic powder isetyenziselwa izimonyo ezisekelwe kwioli. Iipowders ze-Hydrophilic zifunyanwa ngokubanzi ngonyango lwe-inorganic surface.Ininzi yala ma-nano-TiO2 powders angaphandle aye afumana unyango olukhethekileyo ngokwemimandla yesicelo.

3.2

Umbala wolusu nano TiO2

Ngenxa yokuba amasuntswana e-nano-TiO2 alungile kwaye kulula ukusasaza ukukhanya okuluhlaza okwesibhakabhaka kunye nobude obufutshane obufutshane ekukhanyeni okubonakalayo, xa kudityaniswe kwizithambiso zelanga, ulusu luya kubonisa ithoni eluhlaza okwesibhakabhaka kwaye ibonakale ingenampilo. Ukuze ulungelelanise umbala wesikhumba, ii-pigments ezibomvu ezifana ne-iron oxide zihlala zongezwa kwiifomyula zokuthambisa kwinqanaba lokuqala. Nangona kunjalo, ngenxa yomahluko wokuxinana kunye nokumanzi phakathi kwe-nano-TiO2 _ 2 kunye ne-iron oxide, imibala edadayo ihlala isenzeka.

4. Isimo sokuvelisa i-nano-TiO2 e-China

Uphando oluncinci kwi-nano-TiO2 _ 2 e-China lusebenza kakhulu, kwaye inqanaba lophando lwethiyori lifikelele kwinqanaba eliphezulu lehlabathi, kodwa uphando olusetyenzisiweyo kunye nophando lobunjineli lubuyele emva, kwaye iziphumo ezininzi zophando azikwazi ukuguqulwa zibe yimveliso yezoshishino. Ukuveliswa kwemveliso ye-nano-TiO2 e-China kwaqala ngo-1997, ngaphezu kweminyaka eyi-10 emva kweJapan.

Kukho izizathu ezibini ezithintela umgangatho kunye nokhuphiswano lwemarike yeemveliso ze-nano-TiO2 e-China:

① Uphando lwetekhnoloji olusetyenziswayo lusemva

Uphando lweteknoloji yesicelo ludinga ukuxazulula iingxaki zokongeza inkqubo kunye novavanyo lwesiphumo se-nano-TiO2 kwinkqubo edibeneyo. Uphando lwesicelo se-nano-TiO2 kwiinkalo ezininzi aluzange luphuhliswe ngokupheleleyo, kwaye uphando kwezinye iindawo, ezifana nezithambiso ze-sunscreen, kusafuneka zinzulu. ayikwazi ukwenza iibrendi zeserial ukuhlangabezana neemfuno ezikhethekileyo zemimandla eyahlukeneyo.

② Itekhnoloji yonyango lomphezulu we-nano-TiO2 ifuna uphononongo olongezelelweyo

Unyango lomphezulu lubandakanya unyango lwe-inorganic surface kunye nonyango lwe-organic surface. Itekhnoloji yonyango lomphezulu iqulunqwe ngefomula yearhente yonyango lomphezulu, itekhnoloji yonyango lomphezulu kunye nezixhobo zonyango lomphezulu.

5. Amagqabantshintshi okuqukumbela

Ukungafihli, ukusebenza kwe-ultraviolet shielding, i-dispersibility kunye nokumelana nokukhanya kwe-nano-TiO2 kwi-cosmetics ye-sunscreen ibalulekile izalathisi zobugcisa ukugweba umgangatho wayo, kunye nenkqubo yokudibanisa kunye nendlela yonyango yendawo ye-nano-TiO2 iyisitshixo sokumisela ezi indexes zobuchwepheshe.