This paper reviews some of the nanoindentation research that has been done on teeth and discusses the usefulness of this technique in studying the structure-property-function relationship at the micro and nanometer sc...This paper reviews some of the nanoindentation research that has been done on teeth and discusses the usefulness of this technique in studying the structure-property-function relationship at the micro and nanometer scale. In particular, examples on the use of nanoindentation technique in investigating the effects of cleansing and bleaching agents as well as drinks on the micro- and nanostructures and mechanical properties of teeth are highlighted. Although nanoindentation on teeth is a relatively new area of research, it provides an excellent way of probing and relating the structures and mechanical properties of teeth at the submicron and nanometer scales that were previously not possible but which can now greatly benefit dental research. For example, a nanoindenter with a high resolution imaging capability can help to elucidate the mechanisms with which certain diseases can damage and compromise the structural integrity of teeth at the micro- and nanometer scale. With this information, clinicians and researchers can then work towards how best to tackle these problems or even preventing them.展开更多
为了分析易解理的脆性氧化镓晶体的精密加工过程中材料去除机理,采用金刚石压头、G200型纳米压痕仪,分别对氧化镓晶体的(100)和(010)2个主要晶面的纳米力学性能进行了试验研究。纳米压痕试验发现:2个晶面都有"pop-in"现象,首...为了分析易解理的脆性氧化镓晶体的精密加工过程中材料去除机理,采用金刚石压头、G200型纳米压痕仪,分别对氧化镓晶体的(100)和(010)2个主要晶面的纳米力学性能进行了试验研究。纳米压痕试验发现:2个晶面都有"pop-in"现象,首次出现pop-in的载荷分别为:4.31 m N和5.42 m N。通过变载荷纳米划痕试验和VK-X110激光显微系统观测,发现2个晶面都有"pile-up"现象,刻划过程中期均出现了塑性域加工特征,(100)和(010)晶面的塑性域加工切削深度范围分别是96.5~576.8 nm和84.6~421.6 nm。展开更多
The relationship between topography,thermo magnetic and mechanical properties in the as-cast Gd75Ge15Si5Pr5 alloy was studied.Atomic force microscopy investigations accompanied by micrograph analysis confirm dual phas...The relationship between topography,thermo magnetic and mechanical properties in the as-cast Gd75Ge15Si5Pr5 alloy was studied.Atomic force microscopy investigations accompanied by micrograph analysis confirm dual phase nature(observed as dark and bright phase)of the investigated material.The mechanical properties studies performed with respect to the Oliver-Pharr procedure show that the average instrumental hardness,Young’s modulus and elastic deformation energy to total energy ratio equal 905 HV and 596 HV,131 and 91 GPa,40%and 45%for the dark and bright phase,respectively.The Curie point defined as inflection point on the magnetization versus temperature curve M(T)recorded in zero-field cooled mode equals 283 K.From the law of approach to magnetic saturation the temperature dependence of effective anisotropy constant Keff was calculated in ferromagnetic region.It is also stated that the minimum observed on thermomagnetic M(T)characteristic at 100 K is associated with Keff(T)dependence.展开更多
Two nanomechanical properties of the moleculor deposition （ MD ） film deposited on the Au substrate were studied. The first is its nanotribological property investigated by an atomic force microscope, which indicate...Two nanomechanical properties of the moleculor deposition （ MD ） film deposited on the Au substrate were studied. The first is its nanotribological property investigated by an atomic force microscope, which indicates that the deposition of the MD film could reduce the frictional force. The second is its nanoindent property studied by a nano-indenter. The results show that, after the MD film is deposited on the Au substrate , the elastic modulus, hardness and load decreased all, moreover, the elastic deformation increased and the plastic deformation decreased, which indicates that the MD film can improve the nanomechanical properties of the Au substrate.展开更多
文摘This paper reviews some of the nanoindentation research that has been done on teeth and discusses the usefulness of this technique in studying the structure-property-function relationship at the micro and nanometer scale. In particular, examples on the use of nanoindentation technique in investigating the effects of cleansing and bleaching agents as well as drinks on the micro- and nanostructures and mechanical properties of teeth are highlighted. Although nanoindentation on teeth is a relatively new area of research, it provides an excellent way of probing and relating the structures and mechanical properties of teeth at the submicron and nanometer scales that were previously not possible but which can now greatly benefit dental research. For example, a nanoindenter with a high resolution imaging capability can help to elucidate the mechanisms with which certain diseases can damage and compromise the structural integrity of teeth at the micro- and nanometer scale. With this information, clinicians and researchers can then work towards how best to tackle these problems or even preventing them.
文摘为了分析易解理的脆性氧化镓晶体的精密加工过程中材料去除机理,采用金刚石压头、G200型纳米压痕仪,分别对氧化镓晶体的(100)和(010)2个主要晶面的纳米力学性能进行了试验研究。纳米压痕试验发现:2个晶面都有"pop-in"现象,首次出现pop-in的载荷分别为:4.31 m N和5.42 m N。通过变载荷纳米划痕试验和VK-X110激光显微系统观测,发现2个晶面都有"pile-up"现象,刻划过程中期均出现了塑性域加工特征,(100)和(010)晶面的塑性域加工切削深度范围分别是96.5~576.8 nm和84.6~421.6 nm。
文摘The relationship between topography,thermo magnetic and mechanical properties in the as-cast Gd75Ge15Si5Pr5 alloy was studied.Atomic force microscopy investigations accompanied by micrograph analysis confirm dual phase nature(observed as dark and bright phase)of the investigated material.The mechanical properties studies performed with respect to the Oliver-Pharr procedure show that the average instrumental hardness,Young’s modulus and elastic deformation energy to total energy ratio equal 905 HV and 596 HV,131 and 91 GPa,40%and 45%for the dark and bright phase,respectively.The Curie point defined as inflection point on the magnetization versus temperature curve M(T)recorded in zero-field cooled mode equals 283 K.From the law of approach to magnetic saturation the temperature dependence of effective anisotropy constant Keff was calculated in ferromagnetic region.It is also stated that the minimum observed on thermomagnetic M(T)characteristic at 100 K is associated with Keff(T)dependence.
文摘Two nanomechanical properties of the moleculor deposition （ MD ） film deposited on the Au substrate were studied. The first is its nanotribological property investigated by an atomic force microscope, which indicates that the deposition of the MD film could reduce the frictional force. The second is its nanoindent property studied by a nano-indenter. The results show that, after the MD film is deposited on the Au substrate , the elastic modulus, hardness and load decreased all, moreover, the elastic deformation increased and the plastic deformation decreased, which indicates that the MD film can improve the nanomechanical properties of the Au substrate.
