Materials World Network: Electrochemical Processing of Nanoporous Structures for Superhydrophobic Materials and Polymer Imprinting

材料世界网：超疏水材料和聚合物印迹纳米孔结构的电化学加工

• 批准号: 0603019
• 负责人: Nikolay Dimitrov
• 金额: $ 25.5万
• 依托单位: SUNY at Binghamton
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0603019&HistoricalAwards=false
• 关键词: Materials; World; Network; Electrochemical; Processing

The collaborative program with University of South Australia (UniSA) is aimed at designing and assessing the properties of nanoporous metal (NPM) architectures with controllable pore size and surface roughness. Electrochemical processing based on de-alloying of binary alloys and/or potential controlled galvanic displacement (PCD) will be employed to produce robust, surface-confined porous layers with lateral length-scales in the range of 5 nm to several microns. A subsequent surface modification of these layers (e.g. self-assembly of monolayers, silane chemisorption, plasma polymer deposition) will render these substrates superhydrophobic. Modified structures of that kind possess highly depressed adhesion properties and hence a significant chemical resistance. Also, the virtually non-existing contact angle hysteresis helps water droplets to easily roll off the superhybrophobic surface at small tilting angles. Another direction of this proposal emphasizes research aimed at developing of viable procedure for making polymer imprints from NPM structures confined in a thin surface layer. Potential applications of superhydrophobic NPM and their polymer replicas include self-cleaning windows, snow-repelling satellite antenna, pipes with reduced friction and rain-resistant transmission lines.The objectives of the American counterpart in this collaborative initiative are primarily focused on the development of protocols for synthesis of nanoporous Cu, Ag, Au, Pd and Pt, based on results of: (i) a fundamental study exploring tunable parameters that control the pore size during de-alloying in Cu-Au and Cu-Pt (one component dissolves) and Zn-Cu and Cu-Pd (both components dissolve) alloys; (ii) a fundamental investigation of the PCD process in Cu-Ag (immiscible) and Cu-Au (miscible) systems with emphasis on the factors controlling the evolution of surface morphology. The main scientific outcome will be manifested by the accomplishment of a comparative study of de-alloying and PCD processes aimed at identifying similarities and differences in view of controlling factors and resulting surface morphology. While the alloy processing will be carried out mainly by classical electrochemical methods, the structure, morphology and surface composition of the synthesized NPM will be characterized using scanning electron microscopy (SEM), scanning probe microscopy (SPM), Small Angle Neutron Scattering (SANS) and X-ray Photoelectron Spectroscopy (XPS)The research activity (co-funded by the Australian Research Council) is arranged in three strongly connected modules developed in collaboration with UniSA: (i) Fundamental investigation and development of optimal electrochemical pathways for synthesis of NPM, (ii) Exploration and implementation of efficient strategies for the hydrophobization of the NPM surfaces, and (iii) Development of procedures for fabricating polymer imprints that replicate the NPM surface topography. The award will support graduate students who will be exposed to an international research environment in summer-long student exchange initiatives with the counterpart institution.This award is co-supported by East Asia-Pacific Program of the NSF Office of International Science and Engineering, and by the Metals and Solid State Chemistry Programs of the Division of Materials Research.

与南澳大学（UniSA）的合作项目旨在设计和评估具有可控孔径和表面粗糙度的纳米多孔金属（NPM）结构的性能。将采用基于二元合金的去合金化和/或电位控制电流位移（PCD）的电化学处理来产生具有5 nm至几微米范围内的横向长度尺度的坚固的表面受限多孔层。这些层的后续表面改性（例如，单层的自组装、硅烷化学吸附、等离子体聚合物沉积）将使这些基底超疏水。这种改性结构具有高度降低的粘附性能，因此具有显著的耐化学性。此外，几乎不存在的接触角滞后有助于水滴以小的倾斜角容易地从超疏水表面滚下。该提案的另一个方向强调旨在开发用于从限制在薄表面层中的NPM结构制造聚合物压印的可行程序的研究。超疏水NPM及其聚合物复制品的潜在应用包括自清洁窗户、防雪卫星天线、减少摩擦的管道和防雨传输线。美国同行在这一合作倡议中的目标主要集中在开发纳米多孔Cu、Ag、Au、Pd和Pt的合成方案，基于以下结果：（i）探索在Cu-Au和Cu-Pt中去合金化期间控制孔径的可调参数的基础研究（一种组分溶解）和Zn-Cu和Cu-Pd（两种成分均溶解）合金;（ii）在Cu-Ag（不混溶）和Cu-Au（混溶）系统中PCD过程的基本研究，重点是控制表面形态演变的因素。主要的科学成果将体现在对去合金化和PCD工艺的比较研究的完成，目的是确定控制因素和所产生的表面形态的相似性和差异。虽然合金加工将主要通过经典的电化学方法进行，但合成的NPM的结构、形态和表面组成将使用扫描电子显微镜（SEM）、扫描探针显微镜（SPM）、小角中子散射（SANS）和X射线光电子能谱（XPS）研究活动（由澳大利亚研究理事会共同资助）安排在与南澳大学合作开发的三个紧密相连的模块中：（i）对合成NPM的最佳电化学途径进行基础研究和开发，（二）探索和实施有效的战略，疏水化的NPM表面，和（三）开发的程序，用于制造复制NPM表面形貌的聚合物印记。该奖项将支持研究生谁将接触到一个国际研究环境中的夏季学生交流活动与对口机构。该奖项是由美国国家科学基金会国际科学与工程办公室的东亚太平洋计划，并由金属和材料研究部的固态化学计划共同支持。