The surface chemistry of monooctadecyl phosphate at the air/water interface. A study of molecular aggregation in monolayers
The surface viscosity η s of monooctadecyl phosphate (m-OP) monolayers increased linearly with time, and this rate increased as the pH was lowered. For the pH range where film dissociation occurred, the monolayers contracted. Increasing the temperature from 12°C. to 22°C. also resulted in a small co...
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| Veröffentlicht in: | Journal of colloid and interface science 1967-02, Vol.23 (2), p.215-220 |
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| container_title | Journal of colloid and interface science |
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| creator | Gershfeld, N.L Pak, C.Y.O |
| description | The surface viscosity
η
s
of monooctadecyl phosphate (m-OP) monolayers increased linearly with time, and this rate increased as the pH was lowered. For the pH range where film dissociation occurred, the monolayers contracted. Increasing the temperature from 12°C. to 22°C. also resulted in a small contraction of the monolayer. By application of a modified Clapeyron equation, the process of spreading of the m-OP film from the crystal on water was found to involve a large decrease in entropy in the range of pH 3–5.8. Maximum decrease in the entropy of spreading occurred at pH 4.7, the pH region of 50% dissociation of m-OP. Crystals of m-OP became mesomorphic in water at 22°C., forming fiber-like structures which were birefringent. The fiber-like structures were not evident at 12°C., though the crystals were still swollen by water. It is concluded from these results that the structure of m-OP monolayers on water is highly complex and involves pH-dependent phosphate-phosphate as well as phosphate-water interactions. |
| doi_str_mv | 10.1016/0021-9797(67)90105-1 |
| format | Article |
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η
s
of monooctadecyl phosphate (m-OP) monolayers increased linearly with time, and this rate increased as the pH was lowered. For the pH range where film dissociation occurred, the monolayers contracted. Increasing the temperature from 12°C. to 22°C. also resulted in a small contraction of the monolayer. By application of a modified Clapeyron equation, the process of spreading of the m-OP film from the crystal on water was found to involve a large decrease in entropy in the range of pH 3–5.8. Maximum decrease in the entropy of spreading occurred at pH 4.7, the pH region of 50% dissociation of m-OP. Crystals of m-OP became mesomorphic in water at 22°C., forming fiber-like structures which were birefringent. The fiber-like structures were not evident at 12°C., though the crystals were still swollen by water. It is concluded from these results that the structure of m-OP monolayers on water is highly complex and involves pH-dependent phosphate-phosphate as well as phosphate-water interactions.</description><identifier>ISSN: 0021-9797</identifier><identifier>EISSN: 1095-7103</identifier><identifier>DOI: 10.1016/0021-9797(67)90105-1</identifier><identifier>PMID: 6040834</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Chemical Phenomena ; Chemistry, Physical ; Phosphates ; Space life sciences ; Surface Tension</subject><ispartof>Journal of colloid and interface science, 1967-02, Vol.23 (2), p.215-220</ispartof><rights>1967</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c423t-82ed05342ccb5520145021e23e081392ea240ad7b5cbb97cfd70aeed07de3bac3</citedby><cites>FETCH-LOGICAL-c423t-82ed05342ccb5520145021e23e081392ea240ad7b5cbb97cfd70aeed07de3bac3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0021-9797(67)90105-1$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/6040834$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Gershfeld, N.L</creatorcontrib><creatorcontrib>Pak, C.Y.O</creatorcontrib><title>The surface chemistry of monooctadecyl phosphate at the air/water interface. A study of molecular aggregation in monolayers</title><title>Journal of colloid and interface science</title><addtitle>J Colloid Interface Sci</addtitle><description>The surface viscosity
η
s
of monooctadecyl phosphate (m-OP) monolayers increased linearly with time, and this rate increased as the pH was lowered. For the pH range where film dissociation occurred, the monolayers contracted. Increasing the temperature from 12°C. to 22°C. also resulted in a small contraction of the monolayer. By application of a modified Clapeyron equation, the process of spreading of the m-OP film from the crystal on water was found to involve a large decrease in entropy in the range of pH 3–5.8. Maximum decrease in the entropy of spreading occurred at pH 4.7, the pH region of 50% dissociation of m-OP. Crystals of m-OP became mesomorphic in water at 22°C., forming fiber-like structures which were birefringent. The fiber-like structures were not evident at 12°C., though the crystals were still swollen by water. It is concluded from these results that the structure of m-OP monolayers on water is highly complex and involves pH-dependent phosphate-phosphate as well as phosphate-water interactions.</description><subject>Chemical Phenomena</subject><subject>Chemistry, Physical</subject><subject>Phosphates</subject><subject>Space life sciences</subject><subject>Surface Tension</subject><issn>0021-9797</issn><issn>1095-7103</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1967</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE9r4zAQxcXS0mbb_QZb0KnsHpyOZCuyL4UQ9k-h0Et7FrI0TrQ4VirJLaZfvkoTetzLiGHe74n3CPnOYM6ALW4AOCsa2cgfC_mzAQaiYF_IjEEjCsmgPCGzT8k5-RrjPwDGhGjOyNkCKqjLakbeHjdI4xg6bZCaDW5dTGGivqNbP3hvkrZopp7uNj7uNjoh1YmmzGgXbl7zHqgb8tzzc7qkMY32iPdoxl4HqtfrgGudnB-y9sO31xOGeElOO91H_HZ8L8jT71-Pq7_F_cOfu9XyvjAVL1NRc7Qgyoob0wrBgVUix0JeItSsbDhqXoG2shWmbRtpOitBY2akxbLVprwg1wffXfDPI8akckqDfa8H9GNUdSVYI3idhdVBaIKPMWCndsFtdZgUA7XvXO0LVftC1UKqj84Vy9jV0X9st2g_oWPJ-X57uGMO-eIwqGgcDgatC2iSst79_4N3JYGSzw</recordid><startdate>196702</startdate><enddate>196702</enddate><creator>Gershfeld, N.L</creator><creator>Pak, C.Y.O</creator><general>Elsevier Inc</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>196702</creationdate><title>The surface chemistry of monooctadecyl phosphate at the air/water interface. A study of molecular aggregation in monolayers</title><author>Gershfeld, N.L ; Pak, C.Y.O</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c423t-82ed05342ccb5520145021e23e081392ea240ad7b5cbb97cfd70aeed07de3bac3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1967</creationdate><topic>Chemical Phenomena</topic><topic>Chemistry, Physical</topic><topic>Phosphates</topic><topic>Space life sciences</topic><topic>Surface Tension</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gershfeld, N.L</creatorcontrib><creatorcontrib>Pak, C.Y.O</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of colloid and interface science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gershfeld, N.L</au><au>Pak, C.Y.O</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The surface chemistry of monooctadecyl phosphate at the air/water interface. A study of molecular aggregation in monolayers</atitle><jtitle>Journal of colloid and interface science</jtitle><addtitle>J Colloid Interface Sci</addtitle><date>1967-02</date><risdate>1967</risdate><volume>23</volume><issue>2</issue><spage>215</spage><epage>220</epage><pages>215-220</pages><issn>0021-9797</issn><eissn>1095-7103</eissn><abstract>The surface viscosity
η
s
of monooctadecyl phosphate (m-OP) monolayers increased linearly with time, and this rate increased as the pH was lowered. For the pH range where film dissociation occurred, the monolayers contracted. Increasing the temperature from 12°C. to 22°C. also resulted in a small contraction of the monolayer. By application of a modified Clapeyron equation, the process of spreading of the m-OP film from the crystal on water was found to involve a large decrease in entropy in the range of pH 3–5.8. Maximum decrease in the entropy of spreading occurred at pH 4.7, the pH region of 50% dissociation of m-OP. Crystals of m-OP became mesomorphic in water at 22°C., forming fiber-like structures which were birefringent. The fiber-like structures were not evident at 12°C., though the crystals were still swollen by water. It is concluded from these results that the structure of m-OP monolayers on water is highly complex and involves pH-dependent phosphate-phosphate as well as phosphate-water interactions.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>6040834</pmid><doi>10.1016/0021-9797(67)90105-1</doi><tpages>6</tpages></addata></record> |
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| ispartof | Journal of colloid and interface science, 1967-02, Vol.23 (2), p.215-220 |
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| language | eng |
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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Chemical Phenomena Chemistry, Physical Phosphates Space life sciences Surface Tension |
| title | The surface chemistry of monooctadecyl phosphate at the air/water interface. A study of molecular aggregation in monolayers |
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