Polymeric Oriented Monolayers and Multilayers as Model Surfaces

Hupfer, B.; Ringsdorf, Helmut

doi:10.1007/978-1-4684-8610-0_4

Cited by 4 publications

(4 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The area ratio of C−C, C−S, and C−P is 79.94, 10.02, and 10.05%, which is close to the expected value as well (Table IV). The chemical shift value of the binding energy is very sensitive to the effects of the electronegativity of the neighboring bound element and the chemical‐binding environment, as mentioned in the literature 23, 31. Therefore, the C−S and C−O peak moves more downfield to the higher binding‐energy value than does the C−P bond.…”

Section: Resultsmentioning

confidence: 94%

“…The phosphorus atom is one of the important elements in the biological system because of its pervasive existence in physiological organs and tissues, such as cells, bones, and body fluids. All living cells are surrounded by a lipid bilayer membrane, which is composed of phospholipids, glycolipids, and cholesterol 31, 32. Therefore, the phosphatidylcholine biomolecule, which is a phospholipid, was used to modify the biomaterial surface through mimicking the biological surface of inactive platelets and red blood cell membranes to achieve better blood compatibility.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Surface characterization and platelet adhesion studies of self-assembled monolayer with phosphonate ester and phosphonic acid functionalities

Tsai

Lin

2001

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

Because of its well-defined surface configuration and creative chemical structure, an alkanethiol self-assembled monolayer (SAM) on gold is a model surface for a blood compatibility investigation. In this study two laboratory-synthesized long-chain alkanethiols, HS(CH(2))(10)PO(3)-(C(2)H(5))(2) and HS(CH(2))(10)PO(3)H(2), were employed for the direct preparation of SAMs with nonionic and ionic functional groups. Various instrumental analyses confirmed the high purity of the phosphonate ester and phosphonic acid terminated alkanethiols. The surface characterization results showed the -PO(3)H(2) terminated SAM was more hydrophilic than the -PO(3)(C(2)H(5))(2) one. Higher hysteresis values for the -PO(3)(C(2)H(5))(2) and -PO(3)H(2) terminated SAMs were noted, which were possibly due to the steric hindrance of the bulky terminal groups. In addition, the O(2) plasma + EtOH-rinse pretreated Au sample was hydrophilic because of the residual gold oxide on the surface. This finding was supported by electron spectroscopy for chemical analysis (ESCA) as well. The ESCA analysis also indicated bulky and polar terminal groups [-PO(3)(C(2)H(5))(2) and -PO(3)H(2)] were situated in the outermost layer of its monolayer. The platelet reactivity on the SAM with the nonionic group -PO(3)(C(2)H(5))(2) was less than those of the ionic terminated SAMs -COOH and -PO(3)H(2). The O(2) plasma + EtOH-rinse pretreated gold substrate exhibited the least platelet-activating surface among the different pretreated Au substrates studied.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Surface characterization and platelet adhesion studies of self-assembled monolayer with phosphonate ester and phosphonic acid functionalities

Tsai

Lin

2001

J. Biomed. Mater. Res.

View full text Add to dashboard Cite

show abstract

“…Hence, macromolecular thin films are promising candidates for a wide range of technological applications including corrosion protection , and chemical sensing media . Additionally, the low surface free energy and negligible aqueous solubility of most polymers means they may be employed as materials for in vivo applications …”

Section: Introductionmentioning

confidence: 99%

Adsorption and Polymerization of Formaldehyde on Cu(100)

Bryden

Garrett

1999

J. Phys. Chem. B

View full text Add to dashboard Cite

The adsorption of formaldehyde (H2CO) on clean Cu(100) at 85 K has been studied using electron energy loss spectroscopy (EELS), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption (TPD). For coverages up to (1.06 ± 0.22) × 1015 H2CO molecules/cm2, formaldehyde spontaneously polymerized to form a monolayer of disordered poly(oxymethylene) (POM), arranged with the chain directions parallel to the surface plane. Thermal decomposition/desorption of the polymer monolayer occurred by three routes, producing peaks in temperature-programmed desorption (TPD) at approximately 177, 200, and 215 K. The lowest temperature peak was exclusively associated with production of H2 and CO in approximately equal proportions. The two higher temperature peaks were produced by molecular H2CO generated via depolymerization of the polymer. The 200 and 215 K features displayed zero- and first-order desorption kinetics, corresponding to estimated activation energies for depolymerization of 75 ± 10 and 53.9 ± 0.5 kJ/mol, respectively. The presence of two polymer desorption peaks is attributed to chain conformational differences present within the monolayer and has not been previously observed in studies of formaldehyde adsorption on metal surfaces. Large exposures of H2CO on this surface formed multilayers of molecular formaldehyde on top of the first polymer layer. The second layer desorbed at 105 K and subsequent layers at ∼100 K.

show abstract

“…Thin films of polymers are promising candidates for a wide range of technological applications including corrosion protection, chemical sensing materials, and in vivo encapsulants . Polymeric materials can be engineered to incorporate high chemical, mechanical, and thermal stability which may enable the tailoring of physical, electronic, and/or optical properties.…”

Section: Introductionmentioning

confidence: 99%

Evidence for Two Chain Length Distributions in the Polymerization of Formaldehyde on Cu(100)

and

Garrett

2001

Langmuir

View full text Add to dashboard Cite

The polymer species formed from the spontaneous polymerization of formaldehyde (H2CO) on clean Cu(100) at 85 K were studied using electron energy loss spectroscopy (EELS) and temperature-programmed desorption (TPD). Formaldehyde forms poly(oxymethylene) (POM) with differing chain lengths; the long (R) and short (β) chain species depolymerize to give two features in TPD at approximately 207 and 219 K, respectively. The complex desorption kinetics observed for the R-POM species were successfully modeled using equations based on the ratio of the average number of monomers unzipped from the chain per initiation event to the length of the polymer chain. Losses were observed in EEL spectra of the short-chain species at ∼290, ∼1020, and ∼1120 cm -1 that can be assigned to the ν(Cu-O), ν(C-O), and F(CH3) modes of oxygen and methoxy endgroups, respectively. Preadsorbed methanol increases the proportion of shortchain POM species by increasing the probability of termination for the β species. Lower thermal stability for adsorbed POM was observed compared to bulk POM and is believed to be related to the stability of the surface-bound oxygen endgroup.

show abstract

Polymeric Oriented Monolayers and Multilayers as Model Surfaces

Cited by 4 publications

References 62 publications

Surface characterization and platelet adhesion studies of self-assembled monolayer with phosphonate ester and phosphonic acid functionalities

Surface characterization and platelet adhesion studies of self-assembled monolayer with phosphonate ester and phosphonic acid functionalities

Adsorption and Polymerization of Formaldehyde on Cu(100)

Evidence for Two Chain Length Distributions in the Polymerization of Formaldehyde on Cu(100)

Contact Info

Product

Resources

About