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Nhasi, machira anoshanda ane antibacterial properties anonyanya kufarirwa. Zvisinei, kugadzirwa kunodhura kwemachira ekushanda ane simba uye kushanda kwakasimba kunoramba kuri dambudziko. Polyvinyl doro (PVA) yakashandiswa kushandura polypropylene (PP) nonwoven jira, uye ipapo sirivheri nanoparticles (AgNPs) yakaiswa mu situ kugadzira PVA-yakagadziridzwa AgNPs-yakatakura PP (inonzi AgNPs). /PVA/PP) machira. Encapsulation yePP fibers uchishandisa PVA coating inobatsira kuvandudza zvakanyanya kusungirirwa kweAg NPs akaremerwa kune PP fibers, uye Ag / PVA / PP nonwovens anoratidza zvakanyanya kunatsiridza ma mechanical properties uye kuramba Escherichia coli (inonzi E. coli). Kazhinji, jira reAg/PVA/PP risingarukwe rakagadzirwa pa30mM silver ammonia concentration rine zvinhu zviri nani zvemuchina, uye mwero wekudzivirira kweantibacterial paE. coli unosvika 99.99%. Iyo jira ichiri kuchengetedza yakanakisa antibacterial chiitiko mushure mekugeza makumi mana uye ine mukana wekudzokorora kushandiswa. Pamusoro pezvo, Ag/PVA/PP jira risiri rakarukwa rine tarisiro yekushandiswa kwakakura muindasitiri nekuda kwekunaka kwemhepo uye kupenya kwemvura. Pamusoro pezvo, takagadzirawo tekinoroji yeroll-to-roll uye takaita ongororo yekutanga kuyedza kugona kwenzira iyi.
Nekudzika kwekudyidzana kwenyika dzepasirese kwehupfumi, kufamba kwehuwandu hwevanhu kwakawedzera zvakanyanya mukana wekutapurira hutachiona, izvo zvinonyatso tsanangura kuti sei iyo novel coronavirus ine simba rakasimba rekupararira pasirese uye zvakaoma kudzivirira1,2,3. Mupfungwa iyi, pane kudiwa kwekukurumidzira kugadzira zvinhu zvitsva zveantibacterial, senge polypropylene (PP) nonwovens, semidziyo yekudzivirira yekurapa. Polypropylene jira risiri rakarukwa rine zvakanakira kushoma density, makemikari inertness uye yakaderera mutengo4, asi haina antibacterial kugona, hupenyu hupfupi hwesevhisi uye yakaderera kuchengetedza kushanda zvakanaka. Naizvozvo, zvakakosha zvikuru kupa antibacterial properties kuPP nonwoven materials.
Semushonga wekare weantibacterial, sirivheri yakapfuura nematanho mashanu ebudiriro: colloidal sirivha mhinduro, sirivheri sulfadiazine, sirivheri munyu, protein sirivha uye nanosilver. Silver nanoparticles iri kuwedzera kushandiswa muminda yakadai semishonga5,6, conductivity7,8,9, pamusoro-inosimudzira Raman scattering10,11,12, catalytic degradation of dyes13,14,15,16 etc. Kunyanya, sirivheri nanoparticles (AgNPs) ine zvakanakira kupfuura zvechinyakare antimicrobial ammonium ammonium agents. kune zvavanoda kupikisa kwebhakitiriya, kugadzikana, mutengo wakaderera uye kugamuchirwa kwezvakatipoteredza17,18,19. Pamusoro pezvo, sirivheri nanoparticles ine yakakura chaiyo nzvimbo uye yakakwira antibacterial chiitiko inogona kusungirirwa kumachira emvere dzemakwai20, machira edonje21,22, machira epolyester uye mamwe machira kuti awane akadzora, anogara achiburitswa eantibacterial sirivheri zvikamu23,24. Izvi zvinoreva kuti nekuvhara maAgNPs, zvinokwanisika kugadzira machira ePP ane antibacterial chiitiko. Nekudaro, PP nonwovens inoshaya mapoka anoshanda uye ine yakaderera polarity, iyo isingakodzeri kune encapsulation yeAgNPs. Kuti vakunde dambudziko iri, vamwe vaongorori vakaedza kuisa maAg nanoparticles pamusoro pemachira ePP vachishandisa nzira dzakasiyana-siyana dzekugadzirisa dzinosanganisira plasma spraying26,27, radiation grafting28,29,30,31 uye overcoating32. Somuenzaniso, Goli et al. [33] yakaunza protein coating pamusoro pePP nonwoven fabric, maamino acids ari padivi peprotein layer anogona kushanda seanchor points yekusungwa kweAgNPs, nekudaro kuwana yakanaka antibacterial properties. chiitiko. Li nevamwe vashandi 34 vakawana kuti N-isopropylacrylamide uye N-(3-aminopropyl) methacrylamide hydrochloride yakabatanidzwa ne ultraviolet (UV) etching yakaratidza simba remishonga inorwisa mabhakitiriya, kunyange zvazvo UV etching process yakaoma uye inogona kuderedza mechanical properties. fibers. . Oliani et al vakagadzirira Ag NPs-PP gel mafirimu ane yakanakisa antibacterial chiitiko ne pretreating yakachena PP ne gamma irradiation; zvisinei, nzira yavo yakanga yakaomawo. Nekudaro, zvinoramba zvichinetsa kugadzira uye nyore kugadzira recyclable polypropylene nonwovens ine inodiwa antimicrobial chiitiko.
Muchidzidzo ichi, polyvinyl doro, ine ushamwari kwezvakatipoteredza uye yakaderera-mutengo membrane zvinhu zvine yakanaka yekugadzira firimu kugona, yakakwira hydrophilicity, uye yakanakisa kugadzikana kwemuviri nemakemikari, inoshandiswa kugadzirisa machira epolypropylene. Glucose inoshandiswa sechinhu chinoderedza36. Kuwedzera kwesimba repamusoro rePP yakagadziridzwa inosimudzira kusarudzwa kweAgNPs. Kuenzaniswa nemucheka wakachena wePP, jira rakagadzirwa reAg / PVA / PP rakaratidza kudzokororwa kwakanaka, basa rakanakisa reantibacterial rinopesana neE.
Iyo PP isina kuruka jira ine chaiyo giravhiti ye 25 g/m2 uye ukobvu hwe 0.18 mm yakapihwa neJiyuan Kang'an Sanitary Materials Co., Ltd. (Jiyuan, China) uye akacheka kuita mapepa anoyera 5 × 5 cm2. Silver nitrate (99.8%; AR) yakatengwa kubva kuXilong Scientific Co., Ltd. (Shantou, China). Glucose yakatengwa kubva kuFuzhou Neptune Fuyao Pharmaceutical Co., Ltd. (Fuzhou, China). Polyvinyl doro (industrial giredhi reagent) yakatengwa kubva kuTianjin Sitong Chemical Factory (Tianjin, China). Mvura yakasvibiswa yakashandiswa sechinhu chinonyungudutsa kana sukurudza uye chakagadzirirwa murabhoritari yedu. Nutrient agar uye muto zvakatengwa kubva kuBeijing Aoboxing Biotechnology Co., Ltd. (Beijing, China). E. coli strain (ATCC 25922) yakatengwa kubva kuZhangzhou Bochuang Company (Zhangzhou, China).
Iyo yakaguma PP tishu yakagezwa ne ultrasound mu ethanol kwemaminitsi gumi nemashanu. PVA yakaguma yakawedzerwa kumvura uye inopisa pa 95 ° C kwemaawa maviri kuti iwane mhinduro yemvura. Zvadaro glucose yakanyungudutswa mu 10 ml yePVA solution ine chikamu chikuru che 0.1%, 0.5%, 1.0% uye 1.5%. Mucheka wakanatswa wepolypropylene nonwoven wakanyudzwa muPVA/glucose solution uye uchidziiswa pa60°C kweawa imwe chete. Mushure mokupisa kwapera, jira rePP-impregnated nonwoven rinobviswa kubva muPVA / glucose solution uye rakaomeswa pa60 ° C kwe0.5 h kuti rigadzire firimu rePVA pamusoro pewebhu, nokudaro kuwana PVA / PP composite. textile.
Silver nitrate inonyungudutswa mu10 ml yemvura inogara ichibvongodza patembiricha yekamuri uye ammonia inowedzerwa inodonha kusvikira mhinduro yachinja kubva pakachena kuenda kushava uye yakajeka zvakare kuwana silver ammonia solution (5–90 mM). Isa PVA/PP nonwoven fabric mu silver ammonia solution woipisa pa 60°C kweawa imwe kuti uite Ag nanoparticles in situ pamusoro pemucheka, woisuka nemvura katatu woomesa pa60°C. C ye 0.5 h kuti uwane Ag/PVA/PP machira akaumbwa.
Mushure mekuedza kwekutanga, takavaka roll-to-roll michina murabhoritari yekugadzirwa kwakakura kwemachira akaumbwa. Iwo ma rollers akagadzirwa nePTFE kudzivirira maitiro asina kunaka uye kusvibiswa. Munguva iyi, nguva yekudzivirira uye chiyero che adsorbed solution inogona kudzorwa nekugadzirisa kumhanya kwema rollers uye chinhambwe pakati pema rollers kuti uwane inodiwa Ag / PVA / PP composite jira.
Iyo tissue surface morphology yakadzidzwa pachishandiswa VEGA3 scanning electron maikorosikopu (SEM; Japan Electronics, Japan) pamhepo inomhanyisa ye5 kV. Chimiro chekristaro chesirivha nanoparticles chakaongororwa neX-ray diffraction (XRD; Bruker, D8 Advanced, Germany; Cu Kα radiation, λ = 0.15418 nm; voltage: 40 kV, ikozvino: 40 mA) muhuwandu hwe10-80 °. 2θ. Fourier inoshandura infrared spectrometer (ATR-FTIR; Nicolet 170sx, Thermo Fisher Scientific Incorporation) yakashandiswa kuongorora maitiro emakemikari emucheka-akagadziridzwa polypropylene jira. Iyo PVA inogadziridza zviri mukati meAg/PVA/PP machira akaumbwa akayerwa neiyo thermogravimetric ongororo (TGA; Mettler Toledo, Switzerland) pasi perukova rwenitrogen. Inductively yakabatanidzwa plasma mass spectrometry (ICP-MS, ELAN DRC II, Perkin-Elmer (Hong Kong) Co., Ltd.) yakashandiswa kuona sirivheri yemukati meAg/PVA/PP machira akaumbwa.
The air permeability uye mvura vapor transmission rate yeAg/PVA/PP composite machira (specification: 78×50cm2) akayerwa nevechitatu-party test agency (Tianfangbiao Standardization Certification and Testing Co., Ltd.) maererano neGB/T. 5453-1997 uye GB/T 12704.2-2009. Pamuenzaniso wega wega, gumi akasiyana mapoinzi anosarudzwa kuti aedzwe, uye iyo data inopiwa neiyo agency ndiyo avhareji yemapoinzi gumi.
Iyo antibacterial chiitiko cheAg/PVA/PP inoumbwa machira akayerwa zvinoenderana neChinese zviyero GB/T 20944.1-2007 uye GB/T 20944.3- kushandisa agar plate diffusion nzira (qualitative analysis) uye shake flask nzira (quantitative analysis). . zvakateerana muna 2008. Basa reantibacterial reAg/PVA/PP rinoumbwa nemucheka weEscherichia coli rakatemwa panguva dzakasiyana dzekugeza. Panzira yeagar plate diffusion, bvunzo yeAg/PVA/PP inoumbwa jira inoroverwa mudhisiki (dhayamita: 8 mm) uchishandisa punch uye yakanamirwa kune agar Petri dish rakaiswa Escherichia coli (ATCC 25922). ; 3.4 × 108 CFU ml-1) ndokuzoiswa pa37°C uye 56% hunyoro hunoenderana nemaawa angangoita makumi maviri nemana. Iyo zone ye inhibition yakaongororwa yakatwasuka kubva pakati pe diski kusvika kudenderedzwa remukati remakoloni akapoteredza. Uchishandisa nzira yeshake flask, 2 × 2 cm2 flat plate yakagadzirwa kubva kune yakaedzwa Ag/PVA/PP composite jira uye autoclaved munzvimbo yemuto pa121 ° C uye 0.1 MPa kwemaminetsi makumi matatu. Mushure me autoclaving, sampu yakanyudzwa mu5-mL Erlenmeyer flask ine 70 mL yemuto wemuto solution (suspension concentration 1 × 105-4 × 105 CFU/mL) uye wozoiswa pane oscillating tembiricha ye150 ° C. rpm uye 25 ° C kwemaawa gumi nemasere. Mushure mokuzunungusa, unganidza imwe chiyero chekusimwa kwebhakitiriya uye uidure kagumi. Unganidza huwandu hunodiwa hwekumisikidzwa kwebhakitiriya, huparadze pa agar medium uye tsika pa 37 ° C uye 56% hunyoro hunoenderana kwemaawa makumi maviri nemana. Nzira yekuverenga hutachiona hwehutachiona ndeye: \(\frac{\mathrm{C}-\mathrm{A}}{\mathrm{C}}\cdot 100\%\), apo C uye A ndiyo nhamba yekoloni mushure memaawa makumi maviri nemana, zvichiteerana. Yakarimwa muboka rekutonga uye Ag/PVA/PP inoumbwa tishu.
Kusimba kweAg/PVA/PP machira akaumbwa akaongororwa nekuwacha zvinoenderana ne ISO 105-C10:2006.1A. Panguva yekugeza, nyudza bvunzo Ag/PVA/PP jira rakaumbwa (30x40mm2) mune aqueous solution ine commercial detergent (5.0g/L) woigeza pa40±2 rpm uye 40±5 rpm/min. high speed. °C 10, 20, 30, 40 uye 50 kutenderera. Mushure mekugeza, jira rinoshambidzwa katatu nemvura uye rakaomeswa pakupisa kwe50-60 ° C kwemaminitsi makumi matatu. Shanduko yesirivheri yemukati mushure mekugezwa yakayerwa kuti ione dhigirii rekuita kweantibacterial.
Mufananidzo 1 unoratidza dhiyabhorosi dhizaini yekugadzirwa kweAg/PVA/PP inoumbwa machira. Ndiko kuti, PP nonwoven zvinhu zvakanyudzwa mune yakasanganiswa mhinduro yePVA uye glucose. Iyo PP-yakamisikidzwa isina-yakarukwa zvinhu yakaomeswa kugadzirisa iyo modifier uye inodzikisa mumiririri kuita chisimbiso chisimbiso. Iyo yakaomeswa polypropylene nonwoven jira inonyudzwa mune sirivheri ammonia mhinduro yekuisa iyo sirivheri nanoparticles in situ. Iko kusungirirwa kweiyo modifier, iyo molar ratio yeglucose kune sirivheri ammonia, kuwanda kwesirivha ammonia uye kuita tembiricha kunokanganisa kunaya kweAg NPs. zvinhu zvinokosha. Mufananidzo 2a unoratidza kutsamira kwemvura yekubata kona yeAg/PVA/PP jira pane iyo modifier concentration. Kana iyo modifier yakawedzera kubva 0.5 wt.% kusvika 1.0 wt.%, iyo yekuonana angle yeAg / PVA / PP jira inoderera zvakanyanya; kana iyo modifier yakawedzera kubva 1.0 wt.% kusvika 2.0 wt.%, haichinje. Mufananidzo 2 b unoratidza SEM mifananidzo yePP fibers yakachena uye Ag / PVA / PP machira akagadzirirwa pa 50 mM silver ammonia concentration uye akasiyana molar ratios yeglucose kune sirivheri ammonia (1: 1, 3: 1, 5: 1, uye 9: 1). . mufananidzo. ) Iyo inokonzeresa PP fiber yakatsetseka. Mushure mekuputira nePVA firimu, mamwe mafiber anonamirwa pamwechete; Nekuda kwekuiswa kwesirivheri nanoparticles, mafibers anova akaomarara. Sezvo chiyero chemolar cheiyo inoderedza agent kune glucose inowedzera, iyo yakaiswa yeAg NPs zvishoma nezvishoma inowedzera, uye sezvo chiyero chemolar chinowedzera kusvika ku5: 1 uye 9: 1, Ag NPs inowanzoita aggregates. Macroscopic uye microscopic mifananidzo yePP fiber inowedzera yunifomu, kunyanya kana iyo molar reshiyo yekudzikisa mumiriri kune glucose iri 5: 1. Digital mafoto emasampuli anoenderana akawanikwa pa50 mM sirivheri ammonia anoratidzwa muMufananidzo S1.
Shanduko mumvura yekubatanidza angle yeAg / PVA / PP jira pane zvakasiyana PVA concentrations (a), SEM mifananidzo yeAg / PVA / PP jira rinowanikwa pane sirivheri ammonia ye50 mM uye akasiyana molar ratios yeglucose uye sirivheri ammonia [(b))); (1) PP faibha, (2) PVA/PP faibha, (3) molar ratio 1:1, (4) molar ratio 3:1, (5) molar ratio 5:1, (6) molar ratio 9: 1], X-ray diffraction pattern (c) uye SEM image (d) yeAg/PVA/PP jira rinowanikwa paSilver1M (1M) ammonia (1M) m2,5M 2M, Silver (0M) 2M, 5 M2 (3) 30 mM, (4) 50 mM , (5) 90 mM uye (6) Ag/PP-30 mM. Mhedzisiro yekudziya i60°C.
Mumufananidzo 2c inoratidza X-ray diffraction pattern yezvakagadzirwa Ag/PVA/PP machira. Mukuwedzera kune diffraction peak yePP fiber 37, ina diffraction peaks pa 2θ = ~ 37.8 °, 44.2 °, 64.1 ° uye 77.3 ° inoenderana ne (1 1 1), (2 0 0), (2 2 0), Crystal ndege (3 cubic silver face-cent. Sezvo sirivheri ammonia yakawedzera kubva pa5 kusvika 90 mM, iyo XRD mapatani eAg inopinza, inoenderana nekuwedzera kunotevera kwekristaro. Zvinoenderana neformula yaScherrer, saizi yezviyo zveAg nanoparticles yakagadzirwa ne10 mM, 30 mM uye 50 mM silver ammonia yakaverengerwa kuve 21.3 nm, 23.3 nm uye 26.5 nm, zvichiteerana. Izvi zvinodaro nekuti iyo sirivheri ammonia yekumisikidza ndiyo inotyaira iri kuseri kwekudzikisa maitiro kuumba simbi sirivha. Nekuwedzera kuunganidzwa kwesirivheri ammonia, chiyero chenyucleation uye kukura kweAg NPs kunowedzera. Mufananidzo 2d unoratidza iyo SEM mifananidzo yeAg/PVA/PP machira anowanikwa munzvimbo dzakasiyana dzeAg ammonia. Pane sirivheri ammonia ye30 mM, iyo yakaiswa yeAg NPs ine homogeneous. Nekudaro, kana iyo sirivheri ammonia yakakwira zvakanyanya, kufanana kweAg NP deposition layer inodzikira, izvo zvinogona kunge zvichikonzerwa nekusangana kwakasimba muAg NP deposition layer. Mukuwedzera, sirivheri nanoparticles pamusoro pepamusoro ine maumbirwo maviri: spherical uye scaly. Iyo spherical particle size inenge 20-80 nm, uye iyo lamellar lateral size inenge 100-300 nm (Mufananidzo S2). Iyo deposition layer yeAg nanoparticles pamusoro peiyo isina kuchinjwa PP jira haina kuenzana. Mukuwedzera, kuwedzera kwekushisa kunokurudzira kuderedzwa kweAg NPs (Fig. S3), asi yakanyanyisa kupisa kwekushisa hakukurudziri kusanaya kweAg NPs.
Mufananidzo 3a schematically inoratidzira hukama pakati peiyo sirivheri ammonia, huwandu hwesirivha yakaiswa, uye antibacterial chiitiko cheyakagadzirirwa Ag/PVA/PP machira. Mufananidzo 3b unoratidza maitiro anorwisa mabhakitiriya emasampuli pazvikamu zvakasiyana zvesirivha ammonia, iyo inogona kuratidza zvakananga maitiro eantibacterial emasampuli. Kana iyo sirivheri ammonia yakawedzera kubva pa5 mM kusvika 90 mM, huwandu hwekunaya kwesirivha hwakawedzera kubva pa13.67 g/kg kusvika 481.81 g/kg. Mukuwedzera, sezvo huwandu hwekuiswa kwesirivha hunowedzera, basa reantibacterial rinopesana neE. coli rinotanga rinowedzera uye rinoramba riri pakakwirira. Kunyanya, kana sirivheri yeammonia iine 30 mM, iyo yekuisa huwandu hwesirivheri mune inoguma Ag/PVA/PP jira i67.62 g/kg, uye antibacterial rate i99.99%. uye sarudza iyi sampuli semumiriri kune inotevera structural characterization.
(a) Hukama pakati peyero yeantibacterial chiitiko uye huwandu hweAg layer yakashandiswa uye kusangana kwesirivha ammonia; (b) Mifananidzo yemahwendefa etsika yemabhakitiriya akatorwa nekamera yedhijitari inoratidza masampuli asina chinhu uye masamples akagadzirwa pachishandiswa 5 mM, 10 mM, 30 mM, 50 mM uye 90 mM silver ammonia. Antibacterial chiitiko cheAg/PVA/PP jira kurwisa Escherichia coli
Mufananidzo 4a unoratidza FTIR/ATR spectra yePP, PVA/PP, Ag/PP uye Ag/PVA/PP. Iwo mabhendi ekunyudza e pure PP fiber pa 2950 cm-1 uye 2916 cm-1 anokonzerwa neasymmetric stretching vibration ye -CH3 uye -CH2- mapoka, uye pa 2867 cm-1 uye 2837 cm-1 imhaka ye symmetric stretching vibration ye -CH3 uye -CH2 mapoka. –CH3 uye –CH2–. Mabhendi ekunyudza ari pa1375 cm–1 uye 1456 cm–1 anonzi asymmetric uye symmetric shift vibrations of -CH338.39. Iyo FTIR spectrum yeAg/PP fiber yakafanana neiyo yePP fiber. Pamusoro peiyo bhendi yekunyudza yePP, iyo nyowani yekunyudza peak pa3360 cm-1 yePVA/PP uye Ag/PVA/PP machira inoratidzwa nekutambanudza kwehydrogen bond ye -OH boka. Izvi zvinoratidza kuti PVA inobudirira kuiswa pamusoro pe polypropylene fiber. Pamusoro pezvo, iyo hydroxyl absorption peak yeAg/PVA/PP jira haina kusimba zvishoma pane iyo yePVA/PP jira, izvo zvingave zvichikonzerwa nekubatana kwemamwe mapoka ehydroxyl ane sirivheri.
FT-IR spectrum (a), TGA curve (b) uye XPS kuyerwa spectrum (c) ye pure PP, PVA/PP jira uye Ag/PVA/PP jira, uye C 1s spectrum ye pure PP (d), PVA/PP PP jira (e) uye Ag 3d peak (f) yeAg/PVA/PP jira.
Mumufananidzo 4c inoratidza XPS spectra yePP, PVA / PP, uye Ag / PVA / PP machira. Iyo isina simba O 1s chiratidzo che pure polypropylene fiber inogona kuverengerwa kune okisijeni element yakashambadzirwa pamusoro; iyo C 1s peak pa284.6 eV inonzi CH uye CC (ona Mufananidzo 4d). Kuenzaniswa nePP fiber yakachena, PVA / PP jira (Fig. 4e) inoratidza kushanda kwepamusoro pa 284.6 eV (C-C / C-H), 285.6 eV (C-O-H), 284.6 eV (C-C / C-H), 285.6 eV (C-O-H) uye 288-H = 288-H = 288. Mukuwedzera, iyo O 1s yemucheka wePVA / PP inogona kuenzaniswa nepamusoro pepamusoro pe532.3 eV uye 533.2 eV41 (Fig. S4), idzi C 1s peaks dzinoenderana neC-OH uye H-C = O (hydroxyl mapoka ePVA uye aldehyde glucose group), iyo inoenderana neFTIR data. Iyo Ag/PVA/PP jira risingarukwa rinochengeta O 1s spectrum yeC-OH (532.3 eV) uye HC=O (533.2 eV) (Figure S5), ine 65.81% (atomic percent) C, 22. 89. % O uye 11.31% Sg. Kunyanya, mapeji eAg 3d5 / 2 uye Ag 3d3 / 2 pa 368.2 eV uye 374.2 eV (Fig. 4f) anowedzera kuratidza kuti Ag NPs inoputirwa pamusoro pePVA / PP42 nonwoven fabric.
Iyo TGA curves (Fig. 4b) yeP PP yakachena, Ag / PP jira, uye Ag / PVA / PP jira rinoratidza kuti vanopinda maitiro akafanana ekuparara kwemafuta, uye kuiswa kweAg NPs kunotungamirira kukuwedzera kuduku kwekushisa kwekushisa kwePP. fibers PVA/PP fibers (kubva pa480 °C (PP fibers) kusvika ku495 °C), zvichida nekuda kwekuumbwa kweAg barrier43. Panguva imwecheteyo, zviyero zvakasara zvemasampuli akachena ePP, Ag/PP, Ag/PVA/PP, Ag/PVA/PP-W50 uye Ag/PP-W50 mushure mekupisa pa800 ° C aiva 1.32%, 16.26% uye 13. 86%. % zvakateerana 9.88% uye 2.12% (chivakashure W50 pano chinoreva makumi mashanu ekugeza). Iyo yakasara yePP yakachena inonzi inokonzerwa netsvina, uye yakasara yemasampuli asara kune Ag NPs, uye mutsauko muhuwandu hwasara hwemasampuli akaremerwa nesirivha unofanirwa kuve nekuda kwehuwandu hwakasiyana hwesirivha nanoparticles akaiswa paari. Pamusoro pezvo, mushure mekugeza machira eAg/PP ka50, sirivha yakasara yakaderedzwa ne94.65%, uye sirivha yakasara yemucheka weAg/PVA/PP yakaderedzwa ne31.74%. Izvi zvinoratidza kuti PVA encapsulating coating inogona kunyatso kuvandudza kunamatira kweAgNPs kune iyo PP matrix.
Kuti uongorore kupfeka kunyaradza, kupenya kwemhepo uye mhepo yekufambisa yemvura yemucheka wakagadzirirwa we polypropylene wakayerwa. Kazhinji kutaura, kufema kunoenderana nekunyaradza kwemushandisi, kunyanya munzvimbo dzinopisa uye dzine mwando44. Sezvinoratidzwa muMufananidzo 5a, kupera kwemhepo kwePP yakachena ndeye 2050 mm / s, uye mushure mekushandurwa kwePVA inoderera kusvika 856 mm / s. Izvi zvinodaro nekuti iyo firimu rePVA rakaumbwa pamusoro pePP fiber uye chikamu chakarukwa chinobatsira kudzikisa mapundu pakati pemafayibha. Mushure mekushandisa maAg NPs, kupenya kwemhepo kwejira rePP kunowedzera nekuda kwekushandiswa kwePVA coating paunoshandisa Ag NPs. Pamusoro pezvo, kufema kwemachira eAg/PVA/PP kunowedzera kudzikira sezvo sirivheri ammonia inokwira kubva pa10 kusvika pa50 mmol. Izvi zvinogona kunge zvichikonzerwa nekuti ukobvu hwesilvha dhipoziti inowedzera nekuwedzera sirivheri ammonia, iyo inobatsira kuderedza huwandu hwemapores uye mukana wemhute wemvura uchipfuura nepakati pavo.
(a) Mhepo inopindirana yeAg / PVA / PP machira akagadzirirwa neakasiyana-siyana esirivha ammonia; (b) Kufambiswa kwemhepo yemvura yeAg / PVA / PP machira akagadzirirwa neakasiyana-siyana esirivha ammonia; (c) Yakasiyana-siyana modhifita Tensile curve yeAg Fabric/PVA/PP inowanikwa munzvimbo dzakasiyana; (d) Tensile curve yeAg / PVA / PP machira akawanikwa pazvikamu zvakasiyana zvesilver ammonia (Ag / PVA / PP jira rinowanikwa pa 30 mM silver ammonia concentration inoratidzwawo) (Enzanisa tambo dzakasimba dzemachira ePP mushure mekutenderera makumi mana).
Chiyero chekufambisa kwemhepo yemvura ndeimwe chiratidzo chakakosha chekunyaradza kwekudziya kwejira45. Zvinoitika kuti hunyoro hwekupenya kwemachira kunonyanya kukanganiswa nekufema uye pamusoro pezvinhu. Ndiko kuti, kufema kwemhepo kunonyanya kuenderana nehuwandu hwema pores; zvimiro zvepasi zvinokanganisa kupenya kwemvura yemapoka ehydrophilic kuburikidza neadsorption-diffusion-desorption yemamorekuru emvura. Sezvinoratidzwa muMufananidzo 5b, kunyorova kwemvura yakachena yePP fiber ndeye 4810 g / (m2 · 24h). Mushure mekuiswa chisimbiso nePVA coating, nhamba yemakomba muPP fiber inoderera, asi kunyorova kwejira rePVA / PP kunowedzera kusvika 5070 g / (m2 · 24 h), sezvo kunyorova kwayo kunonyanya kutsanangurwa nepamusoro pezvinhu. kwete pores. Mushure mekuiswa kweAgNPs, kunyorova kweAg/PVA/PP jira kwakawedzera kuwedzera. Kunyanya, iyo yakanyanya kunyorova kupenya kweAg / PVA / PP jira rinowanikwa pane sirivheri ammonia ye30 mM ndeye 10300 g / (m2 · 24h). Panguva imwecheteyo, kupenya kwakasiyana kwehunyoro hweAg/PVA/PP machira anowanikwa munzvimbo dzakasiyana dzesirivha ammonia anogona kubatanidzwa nekusiyana kwehukobvu hwesivheri deposition layer uye nhamba yemapores ayo.
Iyo mechanic properties yemachira inokanganisa zvakanyanya hupenyu hwavo hwesevhisi, kunyanya sezvinhu zvinodzokororwa zvakare46. Mufananidzo 5c unoratidza tensile stress curve yeAg/PVA/PP jira. Kusimba kwekusimba kwePP yakachena inongova 2.23 MPa, nepo simba rekusimba re 1 wt% PVA / PP jira rinowedzera zvakanyanya kusvika ku 4.56 MPa, zvichiratidza kuti iyo encapsulation yePVA PP jira inobatsira kuvandudza zvakanyanya maitiro ayo emagetsi. properties. Iko kusimba kwesimba uye kurebesa pakuputika kwePVA / PP jira rinowedzera nekuwedzera kusungirirwa kwePVA modifier nekuti iyo PVA firimu inogona kutyora kushushikana uye kusimbisa iyo PP fiber. Nekudaro, kana iyo modifier ikawedzera kusvika 1.5 wt.%, inonamira PVA inoita kuti jira re polypropylene riome, izvo zvinokanganisa zvakanyanya kupfeka kunyaradza.
Kuenzaniswa neakachena PP uye PVA / PP machira, kusimba kwesimba uye kurebesa pakupwanyika kweAg/PVA/PP machira anowedzerwazve kuvandudzwa nekuti Ag nanoparticles akagovaniswa zvakafanana pamusoro pePP fibers anogona kugovera mutoro47,48. Zvinogona kuonekwa kuti simba rekusimba reAg / PP fiber yakakwirira kudarika yePP yakachena, inosvika 3.36 MPa (Fig. 5d), iyo inosimbisa simba rakasimba uye rinosimbisa reAg NPs. Kunyanya, iyo Ag / PVA / PP jira rakagadzirwa pasirivheri ammonia ye30 mM (panzvimbo ye50 mM) inoratidza yakanyanya kusimba simba uye kureba panguva yekuzorora, izvo zvichiri nekuda kweiyo yunifomu deposition yeAg NPs pamwe neiyo yunifomu deposition. Aggregation yeSilver NPs pasi pemamiriro ekukwirira kwesirivha ammonia. Mukuwedzera, mushure memazuva makumi mana ekushambidza, kusimba kwesimba uye elongation pakuputsika kweAg / PVA / PP jira rakagadzirirwa pa 30 mM silver ammonia concentration yakaderera ne 32.7% uye 26.8%, maererano (Fig. 5d), iyo inogona kubatanidzwa nekurasikirwa kuduku kwesirivha nanoparticles yakaiswa mushure meizvi.
Mifananidzo 6a uye b inoratidza mapikicha ekamera yedhijitari yemucheka weAg/PVA/PP nemucheka weAg/PP mushure mekugeza 0, 10, 20, 30, 40, uye 50 kutenderera pa30 mM silver ammonia concentration. Rima grey Ag/PVA/PP jira uye Ag/PP jira zvishoma nezvishoma rinova grey mushure mekugeza; uye kuchinja kwemavara ekutanga panguva yekugeza hakuratidziki kwakakomba seyechipiri. Mukuwedzera, kana ichienzaniswa nemucheka weAg / PP, sirivha yeAg / PVA / PP jira yakaderera zvishoma nezvishoma mushure mekugeza; mushure mekugeza 20 kana kupfuura nguva, yekare yakachengetedza sirivha yakakwirira kupfuura iyo yekupedzisira (Fig. 6c). Izvi zvinoratidza kuti encapsulating PP fibers nePVA coating inogona kuvandudza zvakanyanya kunamatira kweAg NPs kune PP fiber. Mufananidzo 6d unoratidza mifananidzo yeSEM yeAg/PVA/PP jira uye Ag/PP machira mushure mekugeza kwegumi, 40, uye 50 cycles. Ag/PVA/PP machira anoona kurasikirwa kushoma kweAg NPs panguva yekugeza kupfuura machira eAg/PP, zvakare nekuti iyo PVA encapsulating coating inobatsira kuvandudza kunamatira kweAg NPs kune PP fiber.
(a) Mifananidzo yeAg / PP jira rakatorwa nekamera ye digital (yakatorwa pa 30 mM silver ammonia concentration) mushure mekugeza kwe0, 10, 20, 30, 40 uye 50 cycles (1-6); (b) Ag/PVA/PP Mifananidzo yemachira akatorwa nekamera yedhijitari (yakatorwa pa30 mM silver ammonia concentration) mushure mekugeza kwe0, 10, 20, 30, 40 uye 50 cycles (1-6); (c) Shanduko dzesirivheri dzemachira maviri pamawasheni; (d) SEM mifananidzo yeAg / PVA / PP jira (1-3) uye Ag / PP jira (4-6) mushure me10, 40 uye 50 yekuwachisa.
Mufananidzo 7 unoratidza basa reantibacterial uye mapikicha ekhamera yedhijitari yeAg/PVA/PP machira achipesana neE. coli mushure me10, 20, 30 uye 40 washing cycles. Mushure mokunge 10 uye 20 yekugezesa, kushandiswa kweantibacterial yeAg / PVA / PP machira yakaramba iri pa 99.99% uye 99.93%, ichiratidza zvakanakisa antibacterial basa. Iyo antibacterial level yeAg / PVA / PP machira yakaderera zvishoma mushure me30 uye 40 nguva yekugezwa, iyo yaive nekuda kwekurasikirwa kweAgNPs mushure mekugeza kwenguva refu. Nekudaro, iyo antibacterial rate yeAg/PP machira mushure mekugeza makumi mana ingori 80.16%. Zviripachena kuti iyo antibacterial mhedzisiro yeAg/PP machira mushure memakumi mana ekugezesa kutenderera ishoma pane iyo yeAg/PVA/PP machira.
(a) Mwero wemishonga inorwisa mabhakitiriya inopesana neE. coli. (b) Kuenzanisa, mapikicha ejira reAg/PVA/PP rakatorwa nekamera yedhijitari mushure mekugeza jira reAg/PP pa30 mM silver ammonia concentration ye10, 20, 30, 40 uye 40 cycles inoratidzwawo.
Mumufananidzo 8 schematically inoratidza kugadzirwa kwejira guru reAg / PVA / PP uchishandisa nzira yezvikamu zviviri. Ndiko kuti, iyo PVA / glucose mhinduro yakanyudzwa mupumburu yenguva yakati rebei, yobva yatorwa kunze, yobva yaiswa nesirivha ammonia mhinduro nenzira imwechete yekuwana Ag/PVA/PP machira. (Mufananidzo 8a). Iyo yakazobuda Ag/PVA/PP jira richiri kuchengetedza yakanakisa antibacterial chiitiko kunyangwe yakasara kwegore rimwe. Nokuda kwekugadzirira kukuru kweAg / PVA / PP machira, iyo yakaguma PP nonwovens yakamisikidzwa mukuenderera mberi roll process uye ndokupfuura nepakati pePVA / glucose mhinduro uye sirivheri ammonia mhinduro sequentially uye yakagadziriswa. nzira mbiri. Mavhidhiyo akabatanidzwa. Nguva ye impregnation inodzorwa nekugadzirisa kukurumidza kwemupumburu, uye chiyero che adsorbed solution chinodzorwa nekugadzirisa kureba pakati pema rollers (Fig. 8b), nokudaro kuwana chinangwa cheAg / PVA / PP jira risina kurongeka rehukuru hukuru (50 cm × 80 cm). ) uye roller yekuunganidza. Iyo yose nzira iri nyore uye inoshanda, iyo inobatsira pakugadzirwa kukuru.
Schematic dhizaini yekugadzirwa kwezvakakura-saizi zvinonangwa zvigadzirwa (a) uye schematic dhizaini ye roll process yekugadzirwa kweAg/PVA/PP nonwoven materials (b).
Silver-ine PVA/PP nonwovens inogadzirwa uchishandisa yakapusa in-situ fluid chikamu deposition tekinoroji yakasanganiswa neye roll-to-roll nzira. Kuenzaniswa nemucheka wePP uye PVA / PP jira, iyo mechanic zvimiro zveyakagadzirirwa Ag / PVA / PP nonwoven jira inovandudzwa zvakanyanya nekuti iyo PVA yekuisa chisimbiso layer inogona kuvandudza zvakanyanya kunamatira kweAg NPs kune PP fibers. Pamusoro pezvo, huwandu hwekurodha hwePVA uye zvirimo zveSilver NPs muAg/PVA/PP nonwoven jira rinogona kudzorwa zvakanaka nekugadzirisa kuwanda kwePVA/glucose solution uye silver ammonia solution. Kunyanya, Ag/PVA/PP nonwoven jira rakagadzirwa uchishandisa 30 mM silver ammonia solution yakaratidza yakanakisa mechanical properties uye yakachengeta yakanakisa antibacterial activity against E. coli even after 40 washing cycles, ichiratidza zvakanaka anti-fouling simba. PP isiri-yakarukwa zvinhu. Zvichienzaniswa nemamwe mashoko ezvinyorwa, machira akawanikwa nesu tichishandisa nzira dziri nyore airatidza kusaramba kuwachwa. Uye zvakare, iyo inokonzeresa Ag/PVA/PP nonwoven jira ine yakanakira mwando permeability uye kupfeka nyaradzo, iyo inogona kufambisa kushandiswa kwayo mumaindasitiri maapplication.
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Nguva yekutumira: Nov-26-2023