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indicated.
37
This bonding mode was observed for stainless steel,
nickel, titanium, and iron oxides after each rinse and adhesion
test. Some spectra of the modified iron substrates, however, were
consistent with bidentate bonding modes while others were
consistent with tridentate bonding. This is consistent with phos-
phonic acid SAMs on silicon oxide, where binding is tridentate.
58
The presence of νPdO, νP-O,andshifted νP-O-H indicates
monodentate bonding36
as observed for Nitinol, molybdenum,
and manganese.
For carboxylic acids, the interaction of the headgroup with the
substrate is correlated to the COO- stretch frequency in infrared
spectroscopy.
59
The IR spectrum of solid octadecylcarboxylic
acid contains νCdO at 1700 cm-1
and νC-O at 1465 cm-1
.
60
Spectra of bound carboxylic acid with an absence of the carbonyl
stretch (νCdO)andthepresenceofthe νCOO- asymm peak around
1510 cm-1
and the νCOO- symm peak around 1400 cm-1
implies
that the headgroup bonds to the surface through two oxygen
atoms. This type of bidentate bonding is observed in silver orcopper adlayers on gold61
and on air-exposed silver surfaces.
62
For SAMs on aluminum and stainless steel, multiple carboxylate
species have been observed.
13,34,43
Here, a bidentate bonding of
carboxylic acid with stainless steel was observed32
while the
interaction on iron oxide was a mixture of monodentate and
bidentate (νCdO =1656cm-1
; νCOO- symm and νCOO- asymm peak
at 1470 and 1580 cm-1
, respectively).
The nature of the interaction between the hydroxamic acid
molecule and the surface can be determined from the shifts and
broadening of νCdO, νN-O,and νN-H, indicating a change in
headgroup bonding.
16
The CO and NH region of the ODHA
solid contains νN-H =3252 and 1565 cm-1
, νCdO =1660cm-1
,
and νN-O = 1080 cm-1
. The appearance of peak assigned to
νC-O and the absence of νCdO peak coupled with a shift to lower
frequency of the peak assigned to νN-H and νN-O represent a
bidentate bondingwith the substrate as observed onmolybdenum
samples (Figure 4A).
For sulfonic acid, the SO region of the ODSA solid shows
νSOasym =1178cm-1
, νSOasym =1059cm-1
, νSOH =946 cm-1
,
and νC-S =794cm-1
. After deposition, rinsing, and sonication
on SS316L, the ODSA remains, and the binding region indicates
that there is a strong interaction between ODSA and SS316L due
to the disappearance of the peak attributable to νSOH (946 cm-1
;
Figure 4B) and the broadening of the peaks attributable to S-O
stretching indicating a bonding interaction between the oxygens
and the surface.
40,63
Because of the changes in the spectra and the反应釜内胆材料316L合金和金属氧化物通过有机薄膜行为摘要：通过对不锈钢316L和镍钛诺的表层和它们组成的金属氧化物，就是镍，铬，钼，锰，铁，以及钛，原生氧化层的表面改进的长链和有机酸的有机薄膜形成的研究，我们能更好地理解这些行为。十八烷基膦酸等各种酸的粘附性和稳定性在这项研究中对这些基板进行了检查。通过这些表面上形成的薄膜漫反射傅里叶变换红外光谱进行了分析，和通过对接触角测角，原子力显微镜和基质辅助激光解吸电离质谱。有机部分和基片上的膜的特性和稳定性的组合物的酸度的影响进行了讨论。有趣的是，在合金表面上的反应活性较低的金属部位，存在着不抑制膜形成。
关键词：制冷系统，压缩系统，设计，旋转式压缩机，旋叶式压缩机，损失，泄漏，比较， 滚动转子压缩机。