Amavu n'amavuko
Nkumutungo kamere, mwinshi kandi ushobora kuvugururwa, selile ihura ningorabahizi mubikorwa bifatika bitewe no kudashonga kandi kugarukira.Ubwinshi bwa kristaliste hamwe na hydrogène yuzuye ya hydrogène mumiterere ya selile ituma yangirika ariko ntishonga mugihe cyo kuyitunga, kandi ntigashonga mumazi hamwe na solge nyinshi.Inkomoko yabyo ikorwa na esterification na etherification ya hydroxyl kumatsinda ya anhydroglucose mumurongo wa polymer, kandi izerekana ibintu bitandukanye ugereranije na selile naturel.Imyitwarire ya etherification ya selile irashobora kubyara ether nyinshi ya selile yamashanyarazi, nka methyl selulose (MC), hydroxyethyl selulose (HEC) na hydroxypropyl selulose (HPC), ikoreshwa cyane mubiribwa, kwisiga, mubuvuzi nubuvuzi.Amazi ashonga CE arashobora gukora hydrogène ihujwe na polymers hamwe na acide polycarboxylic na polifenol.
Inteko-ku-nteko (LBL) nuburyo bwiza bwo gutegura polymer compte yoroheje.Ibikurikira bisobanura cyane cyane inteko ya LBL ya CE eshatu zitandukanye za HEC, MC na HPC na PAA, igereranya imyitwarire yabo yo guterana, ikanasesengura ingaruka zabasimbuye ku nteko ya LBL.Iperereza ku ngaruka za pH ku bunini bwa firime, no gutandukanya itandukaniro rya pH ku miterere ya firime no guseswa, hanyuma utezimbere uburyo bwo kwinjiza amazi ya CE / PAA.
Ibikoresho by'Ubushakashatsi:
Acide polyacrylic (PAA, Mw = 450.000).Ubukonje bwa 2wt.% Umuti wamazi wa hydroxyethylcellulose (HEC) ni 300 mPa · s, naho urwego rwo gusimburwa ni 2.5.Methylcellulose (MC, igisubizo cyamazi ya 2wt.% Ifite ubwiza bwa mPa · 400 na dogere yo gusimbuza 1.8).Hydroxypropyl selulose (HPC, igisubizo cyamazi ya 2wt.% Na viscosity ya 400 mPa · s hamwe nurwego rwo gusimbuza 2.5).
Gutegura film:
Byateguwe ninteko isukuye ya kirisiti kuri silicon kuri 25 ° C.Uburyo bwo kuvura matrike ya slide nuburyo bukurikira: shira mumuti wa acide (H2SO4 / H2O2, 7 / 3Vol / VOL) muminota 30min, hanyuma kwoza n'amazi ya deionioni inshuro nyinshi kugeza pH itabogamye, amaherezo ikuma hamwe na azote nziza.Inteko ya LBL ikorwa hakoreshejwe imashini zikoresha.Substrate yongeye guhinduranya mumuti wa CE (0.2 mg / mL) nigisubizo cya PAA (0.2 mg / mL), buri gisubizo cyashizwe muminota 4.Kunyunyuza gatatu kuminota 1 buriwese mumazi ya deionion yakorwaga hagati ya buri gisubizo cya soak kugirango ukureho polymer ifatanye.Indangagaciro za pH zumuti winteko hamwe nigisubizo cyo kwoza byombi byahinduwe kuri pH 2.0.Filime nkuko byateguwe bisobanurwa nka (CE / PAA) n, aho n bisobanura inzinguzingo.(HEC / PAA) 40, (MC / PAA) 30 na (HPC / PAA) 30 byateguwe cyane.
Ibiranga firime:
Hafi yerekana ibintu bisanzwe byerekana kandi byasesenguwe hamwe na NanoCalc-XR Ocean Optics, hanyuma hapimwa ubunini bwa firime zashyizwe kuri silicon.Hamwe na sisitemu ya silicon yubusa nkinyuma, FT-IR ya ecran ya firime yoroheje kuri substrate ya silicon yakusanyirijwe kuri Nicolet 8700 infrarafurike.
Imikoreshereze ya hydrogen hagati ya PAA na CEs:
Inteko ya HEC, MC na HPC hamwe na PAA muri firime ya LBL.Imirasire ya infragre ya HEC / PAA, MC / PAA na HPC / PAA irerekanwa mumashusho.Ibimenyetso bikomeye bya IR bya PAA na CES birashobora kugaragara neza muri IR yerekanwe na HEC / PAA, MC / PAA na HPC / PAA.FT-IR spectroscopy irashobora gusesengura hydrogène ihuza ingorane hagati ya PAA na CES mugukurikirana ihinduka ryimiterere yibiranga.Guhuza hydrogen hagati ya CES na PAA bibaho cyane cyane hagati ya hydroxyl ogisijeni ya CES nitsinda rya COOH rya PAA.Nyuma ya hydrogen ihujwe, kurambura impinga itukura ihinduranya icyerekezo gito.
Impinga ya cm 1710-1 yagaragaye kubifu ya PAA.Iyo polyacrylamide yakusanyirijwe muri firime zifite CE zitandukanye, impinga ya firime ya HEC / PAA, MC / PAA na MPC / PAA yari kuri cm 1718 cm-1, 1720 cm-1 na 1724 cm-1.Ugereranije nifu ya PAA yera, uburebure bwa firime ya HPC / PAA, MC / PAA na HEC / PAA bwahinduwe na cm 14, 10 na 8 cm - 1.Isano ya hydrogen hagati ya ether ogisijeni na COOH ihagarika hydrogene ihuza amatsinda ya COOH.Uko imigozi ya hydrogène ikora hagati ya PAA na CE, niko ihinduka ryinshi rya CE / PAA muri IR yerekanwe.HPC ifite urwego rwo hejuru rwa hydrogène ihuza ingorane, PAA na MC ziri hagati, naho HEC niyo yo hasi.
Imyitwarire yo gukura ya firime igizwe na PAA na CEs:
Imyitwarire ya firime ya PAA na CE mugihe cy'iteraniro rya LBL yakozweho iperereza hakoreshejwe QCM na interferometrie.QCM ningirakamaro mugukurikirana imikurire ya firime mubihe byambere byo guterana.Spectral interferometero ikwiranye na firime ikura hejuru yinzinguzingo 10.
Filime ya HEC / PAA yerekanaga iterambere ryumurongo mugihe cyose cyo guterana kwa LBL, mugihe film ya MC / PAA na HPC / PAA yerekanaga iterambere ryihuse mubyiciro byambere byo guterana hanyuma bigahinduka gukura kumurongo.Mu karere gakura kumurongo, urwego rwo hejuru rugoye, niko gukura kwubunini kuri buri cyiciro.
Ingaruka yumuti pH kumikurire ya firime:
Agaciro pH k'igisubizo kagira ingaruka kumikurire ya hydrogen ihujwe na polymer compte firime.Nka polyelectrolyte idakomeye, PAA izahabwa ioni kandi yishyurwe nabi mugihe pH yumuti wiyongereye, bityo bikabuza ishyirahamwe rya hydrogen.Iyo urwego rwa ionisation ya PAA rugeze kurwego runaka, PAA ntishobora guteranira muri firime hamwe na hydrogène yakira muri LBL.
Umubyimba wa firime wagabanutse hamwe no kwiyongera kw ibisubizo pH, kandi ubunini bwa firime bwagabanutse gitunguranye kuri pH2.5 HPC / PAA na pH3.0-3.5 HPC / PAA.Ingingo ikomeye ya HPC / PAA ni pH 3.5, mugihe iya HEC / PAA igera kuri 3.0.Ibi bivuze ko iyo pH yumuti winteko irenze 3.5, firime ya HPC / PAA ntishobora gushingwa, kandi mugihe pH yumuti urenze 3.0, film ya HEC / PAA ntishobora gushingwa.Bitewe nurwego rwohejuru rwa hydrogène ihuza ingirabuzimafatizo ya HPC / PAA, agaciro gakomeye ka pH ya membrane ya HPC / PAA kari hejuru kurenza HEC / PAA.Mu gisubizo kitarimo umunyu, indangagaciro za pH zinganda zakozwe na HEC / PAA, MC / PAA na HPC / PAA zari hafi 2.9, 3.2 na 3.7.PH ikomeye ya HPC / PAA irarenze iya HEC / PAA, ijyanye niyi ya LBL.
Imikorere yo kwinjiza amazi ya CE / PAA membrane:
CES ikungahaye ku matsinda ya hydroxyl kuburyo ifite amazi meza kandi ikabika amazi.Dufashe urugero rwa HEC / PAA nk'urugero, ubushobozi bwa adsorption ya hydrogène ihujwe na CE / PAA membrane kumazi mubidukikije yarizwe.Irangwa na interferometrie yerekanwe, ubunini bwa firime bwiyongera uko firime ikurura amazi.Yashyizwe mubidukikije bifite ubuhehere bushobora guhinduka kuri 25 ° C mumasaha 24 kugirango habeho kuringaniza amazi.Filime zumishijwe mu ziko rya vacuum (40 ° C) kuri 24 h kugirango ikureho ubuhehere.
Mugihe ubuhehere bwiyongera, firime irabyimbye.Ahantu h'ubushuhe buke bwa 30% -50%, imikurire yububyutse iratinda.Iyo ubuhehere burenze 50%, umubyimba ukura vuba.Ugereranije na hydrogène ihujwe na PVPON / PAA membrane, membrane ya HEC / PAA irashobora gukuramo amazi menshi mubidukikije.Ukurikije ubushuhe bugereranije bwa 70% (25 ° C), umubyimba wa firime ya PVPON / PAA uri hafi 4%, mugihe iya firime ya HEC / PAA iri hejuru ya 18%.Ibisubizo byagaragaje ko nubwo umubare munini wamatsinda ya OH muri sisitemu ya HEC / PAA yagize uruhare mugushinga imigozi ya hydrogène, haracyari umubare utari muto wamatsinda OH akorana namazi mubidukikije.Kubwibyo, sisitemu ya HEC / PAA ifite ibyiza byo kwinjiza amazi.
mu gusoza
.
.
(3) Gukura kwa firime ya CE / PAA bifite ishingiro cyane kubisubizo pH.Iyo igisubizo pH kirenze ingingo yacyo ikomeye, PAA na CE ntibashobora guteranira muri firime.Igiterane cya CE / PAA cyegeranye cyakemutse mubisubizo bihanitse bya pH.
(4) Kubera ko film ya CE / PAA ikungahaye kuri OH na COOH, kuvura ubushyuhe bituma bihuza.Igice cyahujwe na CE / PAA membrane gifite ituze ryiza kandi ntigishobora gukemuka mubisubizo bya pH.
(5) Filime ya CE / PAA ifite ubushobozi bwa adsorption kumazi mubidukikije.
Igihe cyo kohereza: Gashyantare-18-2023