T A P CHI H O A H O C T. 5 0 ( 1 ) 5 - 8 T H A N G 2 N A M 2012
VAT LIEU KY UWaC ~ KHA NANG CHE TAO BANG CONG NGHE DIEN HOA
Lc Thj P h u o n g Thao'", D a o T h a n h T h u j \ Nguygn Dire Hung^
Dgi hoc .\f(>-Diu cluil ' Trir&ng Sy quan phong hoa 'Vien Hoa hoc-Veil lieu. Vien KHCNQS
D6n Toa soan 14-7-2010
Abstract
Hydrophobic film on copper metal was fabricated by electrochemical teclinology. Via electroplatinii at hiijlier current densities than limit line. Cu plaling formed from solution of CuSOj 0.08 M and H,SO, 0.06 M" reached a hierarchical structure contact angles of water droplets v\crc greater than 90" without any modification by low suiface energy materials The hydrophobic Cu-"I iO: combination clectroplatmg was formed in the same electroplating condition. At 3 g/1 'f iO. in electrolyte solution, the combination of TiOj in the plating was the best.
1, M O DAU
Tinh tham not la mgt dac [inh quan irgng ciia be- mat ran, Cioc licp \iic {contacl angle CA) \ a goc truot (sliding angle SA) hi bai dai lugng quan trgng d6 danh gia kha nang tham udl. Mang ky nude la cac mang co CA > 90", mang sicu ky n u d e cd CA > 150" [ 1 ].
Cac nghien ciiu cho tb^y, nhOng be mat cd cau true tho rap va cd nang l u g n g be mat thap sc dap u n g yeu cau ciia be mat ky n u d e [2], Do dd, de c h i tao be mat ky ntrdc cd the tao be mat cau triic ibd rap tir n h u n g val lieu c o nang Itrgng be mat thap. hoac tdng hop be iiifil thu nip tir n h u n g \ a l lieu ben sau dd plui len Ircn moi \ a l lieu kiiac cd nang lirgiig be mat (hap bang ciic p h u o n g phap \ a l ly va boa hgc. irong do cac pliuoiig phap dien lida d u a c sir d u n g rdng rai.
n h u lang d g n g dien hda. aiiot hda. ma dien [3]. dien hda polynic j I, 4],..,
T u \ nhien, de dat d u a c linh k\ n u d e ciia be mat
\ a t lieu thi \ e u id n a n g l u g n g be mat thap khong quan irgiig bang \ iec thay ddi liiiili thai cau triic be mat de dai d u g c dd thd rap can tliicl vi tren be mat thd rap. bgl khdng khi se chicin cac Id irdng va da}
giol n u d e len. Gigt n u d e tren cac be mat nay cd xu hu'dng CO lai thanh gigt trdn dc giam tdi da nang l u g n g ciia nd tao nen linh ky n u d e cho be mat vat lieu [6]. Do vay cd the tag be mat ky lurdc ma khong can bien tinh be mat c 6 cau true thd rap bang vat lieu cd n a n g Urang be mat thap [5], Ket q u a nghien ciru kha n a n g che tao be mat ky n u d e tren nen kim loai Cu b a n g phuo'ng phap ma dien v:i ma dien hda to liop k h d n g diing chal bien linh be mat d u a c trinh bay trong bai bao nay.
2. T l i U C N G H I E M
Tam d o n g kim loai d u g c su dung lam anol va catol [5] (kich t h u d c 10 mm x 80 mm x 0.3 mm) d u a c dap phang, danh bdng bang giay rap, lay gi \ a tay bdng trong d u n g dich crdmic. riia xa phong. ruou ctylic, axelon va n u d e cat Dung dicli nia gdm C u S O t 0,08 M va II2SOJ 0,06 M, Q u a trinh ma d u g c khao sat d nhict d o phong \ d i mat d o d d n g tha\' ddi til 0.01 den 0,12 A/cm-, thdi gian ma 60 giay. Hal TiOi cd kicli t h u d c k h o a n g 10 nm d u g c sir d u n g cho qua trinh ma Id h g p C u - T i O i (*).
Hinh thai cau triic be mat mau d u g c \ a c dm!i bang p h u a n g phap c h u p anii hien \'i dien tir quel S i A I . Thanh phan Idp ma d u g c xac dinh bang phd lan sac nang l u g n g E D X . Dua vao anh cluip giot n u d e ircn be mat Idp ma (hinh 1). sir d u n g phan mem autocad ve cac tiep tuyen cua gigt n u d e dc \ a c djnh gdc tiep xiic, danh gia tinh ky n u d e ciia Idp ma, Gigt nude hinh thanh tren be mat Idp ma d u a c nho tir micropipet ed the ticli 4 \.i\.
Wnh J: Anh c h u p gigl n u d e tren hk mat Idp
ma ddng
TCHH. T. 50(1), 2012 3. KET QUA VA THAO LUAN 3.1. Qua trinh catot khi ma dong
Ket qua do dudng cong phan cue ciia dung dich ma CuSOj va H^SOj c6 nfing do axit va ndng 66 mu6i khac nhau dugc trinh bay tai hinh 2 cho thay, qua trinh catot Ichi ma ddng cd ddng gidi han. Dong gidi han lang nhieu khi tang nong do muoi ddng
Le Thi Phirang Thao va cgngsu nhung tang khdng dang ke khi tang ndng do axit.
Dung dich ma ddng tao be mat ky nude dugc thirc bien tai gia tri ddng Id-n ban dong gidi han cua Cu tai ndng do tuang ling va nhu vay, di kem phan ung ket tiia dong kim loai se cd qua trinh dien phan H2O giai phdng H2. Do vgy trong qua trinh ma ddng tao be mat ky nude, d catot ludn cd bgt khi thoat ra tao nen idp ma thd, mau nau den.
(1)0.02 M, (2) 0,04 M, (3) 0,06 M (4) 0.08 M, (5) 0.10 M
(I) 0,04 M, (2) 0,06 M, (3) 0,08 M (4)0,10M, (5)0,12M Hinh 2: Dudng cong phan cue ciia Cu trong dung djch CuSO; + H2SO4, tdc do quet 5 mV/s vdi cac nong do khac nhau H2SOJ (A) va ndng dd khac nhau CuSOa (B) 3.2. IWa dong li); nuoc tren nen kim loai dong
Ma ddng tren nen ddng kim loai tir dung djch gdm CuSOrO,08 M va H.SOj 0.06 M trong 60 giay d nhiet do phdng. khi Ihay ddi mat do dong thu duge cac Idp ma cd dang tinh the nhu nhau nhung su phat trien tinh the khac nhau (hinh 3). Vdi mat do ddng 0.01 A/cm' (hinh 3a), be mat mau xuat hien nhung mo CO dang hinh cay duang xi vdi kich thudc 1 \xm den 2 ^irn, tren be mat co nhirng md ed do phat trien manh han so vdi cac diem khac, Dieu dd chung td trong qua trinh ma da xuat hien nhieu trung tam ket tinh va tdc do phat trien mam tai cac trung tam ket linh manh ho'n so vdi cac diem khdng phai la mam ket trnh. Ddng thdi tren trung lam ket linh lai xuat hien nhfrng trung lam thu cap va tiep tuc phat trien, Tu>' nhien do Idn ciia cac linh the ket tinh chua du dap ung duac do nham can ihiel ciia be mat ky nude (CA < 90").
Khi mat do dong tang, cac mam ket tinh tren be mat ciia Idp ma da phat trien manh hon, kich thudc Idn hon. ben canh nhung mam ket tinh Idn da xuat hien nhirng mam ket tinh nhd (hinh 3b, i ^ 0,04 A/cm") Be mat ma dat den cau triic thu bac vdi cac nhanh tinh the sap .xep dac khi't hon d mat do ddng 0,08 A/cm" (hinh 3c). Cac mam Idn cd kich thudc khoang IOJAITI vdi cac nhanh mam ca I \im. 0 che do ma nay be mat cd cau triic cho dien tich be mat
phat trien va ty le S|„a/Sp],sn,; > 1 nen theo Wenzel [7]
gdc tiep .xuc dat dugc gia tri Idn nhat. Khi mat do ddng tang cao han nira, tdc dd ma tang len. cac mam phat trien rat manh va cd dang ban. kich thudc mam linh the Idn ban lOjjm. khoang each giua cac mam tang len tao cac khe rdng Idn giCra cac md Do vay, cau true be mat thd han nen dien tich be mat ma giam, tinh ky nude giam (hinh 3d) Gia trj goc tiep xuc do dugc tren Idp ma ddng d cac mat do dong khac nhau dugc the hien tren bang I.
Bdng L Goc tiep xiic cua Idp ma dong d cac mat dp ddng khac nhau
Mat dp dong, A/cm"
0,01 0,04 0,08 0.12
Goc tiep xuc, do 65 92 132 112
Anh chup giot nude
^
H @
l a Mil III"!
Nhu vay, mat do ddng 0,08 A/cm^ la che dp tdi
uu d8 ma ddng ky nude tren nen kim loai ddng tir
dung dici^ ma gdm CuSOj 0,08 M va H2SO4 0,06 M.
TCilILT 50(0,2012 Vdl lieu ky mr&c - kha ndng che lao...
• ~'^\ "^ ^ x
(c) (d) tUnh 3 Anh SEM cac Idp ma dong d mat do dong khac nhau:
(a) - i = 0,01 A/cm-; (b) - i = 0,04 A/cm"; (c) - i = 6,08 A/em^; (d) - i = 0,12 /Wcm^
3.3. Ma to hop Cu-TiOi ky nuoc
Vdi che dp ma d tren (dung dich ma 0,08 M CUSO4 + 0,06 M H2SO.,, 1 = 0,08 A/cm-, t = 60 s), lugng TiOi cho vao dung dich de ma to hgp lan luot la 0,5 g/1, i g/1. 2 g/i. 3 g/i va 5 g/I. Nhd sir khuSy iron, hat TiO-. tuy khdng dan dien nhirng duac phan lan deu trong dung dich ma tao thanh huyen phii va di chuyen den be mat catot, bam len be mat idp ma khi ion ddng(ll) phdng dien tao Idp ma. Ket qua phan tich bang phd EDX, xac dinh dugc % Ti trong Idp ma (tuong irng ham lugng Ti02 trong idp ma)
(% khdi lugng) phu thudc vao lugng hat trong dung dich ma dugc bieu dien tren hinh 4. Khi lugng T1O2 Irong dung djch ma lang lir 0,5 den 3 g/1, sd lugng hat Ti02 duge van chuyen den catot tang nen lugng Ti02 ket tiia vao Idp ma tang. Khi lugng TiOi trong dung dich ma tang tir 3 den 5 g/i, lugng Ti02 den dien cue tang len nhieu. toe do tao thanh Cu tren be mat ma cham hon qua trinh van chuyen hat den nen nhirng hat Ti02 da bam vao lai bj lach ra khdi be mat ma dan den giam lugng hat TiOi trong Idp ma. Ham lugng TiOi tren idp ma idn nhat khi lugng TiO;
trong dung dich ma la 3 g/i.
as 0,6 0.4 -
Ham lugng TiO- trong dung dich ma, g/I
////)// •/• Anh hudng ham lugng TiOi trong dung djch ma den ham lugng TiO? trong Idp ina Anh chup SEM cho thay, cac mau ma to hgp cd
c^u Iriic lirang tu nhau dang nhanh cay nhu Idp ma kim loai d6ng (hinh 5), Tuy cac nhanh cay c6 kich
Ihudc Idn han nhung van giir dugc c4u triic thir bac
nen Idp ma td hgp cung cd tinh ky nude, gdc li^p
xiic it thay doi theo ham lugng TiO: Irong dung dicli
T C H H . T, 50(1 ma (bang 2).
Hung 2 Gdc tiep xiic cua cac Idp ma id hgp C u - T i O i Mam lircfngTiOz trong
dung dich ma, g/1 0.5.
i
2 3 5Goc tiep \ i i c , do 126 124 132 138 128
!g^S
/linh 5 Anh SEM man ma id hgp Cu-TiOi
4. KET LUAN
Bang p h u a n g phap ma dien da tao dugc idp ma d d n g ky n u d e tren nen kim loai dong. Ldp ma cd kha nang ky n u d e lot nhat khi ma trong d u n g dich gam C u S O i 0.08 M va H2SO4 0.06 M d mat dp ddng 0,08 A/cm-
Ciing dieu kien ma n h u tren, ldp ma td hgp Cu- TiOj cung cd tinh ky n u d e vdi gdc tiep xuc > 90°.
L u g n g hat T i O : ket tua tren Idp ma Idn nhat khi
Le Thj Phmrng Thao vu cong su trong d u n g dich ma cd 3 g/1 T i O i .
Loi cam o'n: Cdc tdc gio cam mi PGS. TS. Ngo Sy Livang. khua Hoa hoc irir&ng DHKIITN. DHQGHN dd che lao vd cung cap nano TiO:.
T A I L I E U T H A M K H A O
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Bing Zhao Large-area unmodified superln drophobic copper .substrate can he prepared b} an electroleit replacement didposilion. Journal of Colloid and Imerface Science, 329. 208-211 (2009),
3. Tao Hang. Anmin Hu, Huiqin Ling. Ming Li. Da!i Mao. Super-hydrophobic nickel films with micro- nano hierarchical slniciiire prepared by elecirodeposilmn. Applied Surface Science, 256, 2400-2404(2010).
4 JunWang. Jie Chen, Shihe Cao, Sihua Xia, Yuejin Zhu, Gaojie Xu. A facile route tu prepare ZnO super- hvdrophobic surface with hierarchical structure.
Materials Chemistry and Physics. 117, 183-186 (2009)
5 Wenjiin Xi, Zhenmei Qiao. Chunlei Zhu, Ao Jia, Ming Li The preparation of lotus-like super- hydrophobic copper surfaces by electroplating.
Applied Surface Science. 255, 4836-4839 (2009) 6 Minglin Ma, Randal M. Hill Superhydrophohic
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7 Pham VSn Tan. Khoa hoc vd Cong nghe nano, Nxb.
Tri thirc (2009).
Lien he: Le T h i P h u o n g T h a o T r u d n g Dai hgc Md-Dia cliat Ddng Ngac. Tir Liem, Ha Ndi Email l e t h a o m d c @ g m a i l . c o m .
