国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文期刊>Journal of nanotechnology >Silicone Doped Chitosan-Acrylamide Coencapsulated Urea Fertilizer: An Approach to Controlled Release Fertilizers
【24h】

Silicone Doped Chitosan-Acrylamide Coencapsulated Urea Fertilizer: An Approach to Controlled Release Fertilizers

機譯：硅摻雜的殼聚糖-丙烯酰胺共包膜尿素肥料：控釋肥料的一種方法

獲取原文
獲取原文并翻譯 | 示例
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關主題

摘要

In the absence of special management practices, urea is known to undergo chemical transformations resulting in severe losses (=60-70%) of total fertilizer applied. In an attempt to design urea controlled release fertilizers in order to counterbalance the 60-70% loss, urea was cross-linked with chitosan and acrylamide under refluxed in situ copolymerization technique; the procedures were repeated with silicone doping prior cross-linking with MBA. The particles were characterized with FTIR/ATR, EDX, XRD, and SEM. The IR bands observed within 3426-409 cm~(-1) revealed the formation of new bands after coencapsulation for the ν_yN-H, ν_βN-H, νOH, ν_sNH_2, νCH_2, vC=0, δ'NH_2, vC=C, δNH_2, vC-N, βCH_3, $C-N, yNH_2, vC=0, and $CH_2. Crystallinity indices for urea with and without silicone doping were found to be 50.9% and 72.1%, respectively, with a distinctive split peak at (d) 12.30°. The formation of Microdunes and Microballs 3D network sized 0.64 fim was noted. Release profiles demonstrated that 80% N was released in a period of 30 days at RT and pH 7. The release patterns exhibited linear and deformed sigmoid release models. Empirically, the findings demonstrated that it is possible to design urea controlled release fertilizers with varying particle sizes and morphologies by using chitosan-acrylamide coencapsulation.
機譯：在沒有特殊管理方法的情況下，已知尿素會發(fā)生化學轉(zhuǎn)化，導致施用的總肥料嚴重損失（= 60-70％）。為了設計尿素控釋肥料以抵消60-70％的損失，在回流原位共聚技術下，尿素與殼聚糖和丙烯酰胺交聯(lián)。在與MBA交聯(lián)之前，用硅酮摻雜重復該過程。用FTIR / ATR，EDX，XRD和SEM表征顆粒。在3426-409 cm?（-1）范圍內(nèi)觀察到的IR波段揭示了共包裹ν_yN-H，ν_βN-H，νOH，ν_sNH_2，νCH_2，vC = 0，δ'NH_2，vC = C后形成了新的波段， δNH_2，vC-N，βCH_3，$ CN，yNH_2，vC = 0和$ CH_2。發(fā)現(xiàn)具有和不具有硅酮摻雜的尿素的結(jié)晶度指數(shù)分別為50.9％和72.1％，在（d）12.30°處具有明顯的分裂峰。記錄了大小為0.64 fim的Microdunes和Microballs 3D網(wǎng)絡的形成。釋放曲線表明，在室溫和pH為7的情況下，在30天內(nèi)釋放了80％的氮。釋放模式顯示出線性和變形的乙狀結(jié)腸釋放模型。根據(jù)經(jīng)驗，這些發(fā)現(xiàn)表明，通過使用殼聚糖-丙烯酰胺共包封技術，可以設計出具有不同粒徑和形態(tài)的尿素控釋肥料。

著錄項

  • 來源
    《Journal of nanotechnology》 |2017年第2017期|8490730.1-8490730.7|共7頁
  • 作者

    Sempeho Ibahati Siafu;

  • 作者單位

    Department of Distance Education, Institute of Adult Education, P.O. Box 20679, Dar es Salaam, Tanzania;

  • 收錄信息
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關鍵詞

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
獲取原文

客服郵箱：kefu@zhangqiaokeyan.com

京公網(wǎng)安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯(lián)合信息科技 (北京) 有限公司?版權(quán)所有

  • 客服微信

  • 服務號